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REVIEW article

Front. Built Environ., 19 January 2022
Sec. Construction Management
Volume 7 - 2021 | https://doi.org/10.3389/fbuil.2021.632593

A Review of Monitoring Construction Equipment in Support of Construction Project Management

  • Department of Architecture and Architectural Engineering, Kyoto University, Kyoto, Japan

Progress monitoring is an important aspect of construction project control that is fundamental to proper project management and decision-making. Traditional monitoring methods are inaccurate, time-consuming, and labor-intensive because they rely on large-scale manual operations. The defect of the method has been identified as one of the major problems causing project delays and cost overruns. In recent years, a variety of emerging automated data collection, analysis, and visualization techniques have been used to establish methods for digitized, real-time progress monitoring, and there are several papers that address these methodologies and comprehensive reviews. Among them, the authors conducted a review of various studies focusing on how to apply the monitoring of construction equipment to project management. The authors selected the studies of interest using research databases such as Google Scholar and ScienceDirect. Then, the authors classified those studies by technology, purpose, and subject matter, and analyzed the details. Through a literature review, it was revealed that most of the studies were focused on digitalization and review of the lifted path for safety improvement, and few studies were conducted for progress management, such as collection and analysis of work results. In addition, the authors revealed that several studies use the combination of existing technologies with new modeling technologies such as BIM (Building Information Modeling). It was also clarified that the technology applied to the monitoring is not even one, but a combination of multiple technologies to achieve each objective. Furthermore, even in the case of monitoring construction equipment, the authors found that workers, construction materials, and even the activity itself are also monitored as well as construction equipment.

Introduction

A construction project involves a variety of stakeholders, including the client, the architect, the general contractor, sub-contractors, material suppliers, equipment manufacturers, and so on. The organizational body where they form for each project to carry out construction activities is temporary, so there is a high degree of uncertainty in the environment surrounding the construction work. If the site manager does not monitor changing circumstances adequately, the construction project will much likely run out of the schedule and the budget. Therefore, in managing a construction project, progress monitoring is an important matter that provides the basis for the appropriate management and decision-making. It is also essential for improving work safety.

However, the methods of progress monitoring commonly used in construction sites are inaccurate and time-consuming in the data collection and analysis stage. It is also labor-intensive because they rely on large-scale manual operations. The defect of the method has been identified as one of the major problems causing project delays and cost overruns.

Traditional management methods have the following problems.

- Low frequency of Monitoring

- Inefficiency of reporting methods

- Low quality of manually collected data

But in recent years, a variety of emerging automated data collection, analysis, and visualization techniques have been applied to establish methods for digitized, real-time progress monitoring, and there are various papers that address these methodologies and comprehensive reviews.

In this paper, the authors deal with progress monitoring in project management and conduct a review of various studies about how to apply the monitoring of construction equipment to progress monitoring. The aim of this paper is to identify trends in research on “Monitoring construction equipment” and find out what issues need to be studied in the future. Note that “Monitoring construction equipment” means both “monitoring of the construction equipment” and “the construction equipment which is monitoring some other objects” on a construction site.

Then, the authors classified those papers by technology, purpose, and subject matter. It was revealed that most of the studies were focused on digitalization and review of the lifted path for safety improvement. Only a few studies were conducted for progress management, such as collection and analysis of work results. In addition, the authors revealed that several studies use the combination of existing technologies with new modeling technologies such as BIM (Building Information Modeling).

It was also clarified that the technology applied to the monitoring is not even one, but a combination of multiple technologies to achieve each objective. Furthermore, even in the case of monitoring construction equipment, the authors found that workers, construction materials, and even the activity itself are also monitored aw well as construction equipment.

The only results grasped in this paper were technical research. At the actual construction site, consideration must be given to the general contractor responsible for the safe use of the crane. It should also be remembered that the number of crane operators will decrease in the future. The author would like to note these issues in this paper.

Past Studies

Above mentioned issues can be found in several past papers. Until now, progress management has relied too much on human experience and intuition.

As a result, a lot of time has been spent acquiring and analyzing the necessary data. Also, because it is done subjectively, data errors frequently occur (Davidson and Skibniewski, 1995; Cheng and Chen, 2002). Traditional management methods have the following problems.

- Low frequency of Monitoring

In most construction sites, monitoring of progress is not conducted in real-time, but rather daily, or less frequently. Manual data collection often does not allow for corrective interventions because construction workers complete the activities before the feedback information reaches the decision-makers (Sacks et al., 2005; Reboij et al., 2010; Isaac & Navon, 2014).

- Inefficiency of reporting methods

When reporting on the construction progress, the site manager must have reporting methods that express and convey various information about the construction site clearly and intelligibly to others (Koo and Fischer, 2000). Golparvar-Fard and Lee, (2009) recognized the inefficiencies of the existing progress reporting methods in presenting and visualizing multivariable site information and developed a system to understand the difference between time-lapsed photographs taken during the construction process and 4D simulation models created in the planning stage of pre-construction.

- Low quality of manually collected data

The collected data must be of high quality because it is the basis for decision making by the site manager and coordination among stakeholders. This requires accurate information on the completion of construction in progress, the site environment such as weather and soil, and the quality of materials. However, manual collection of progress information is based on the manager’s experience and so there is a risk that it could be subjective (Yoon et al., 2006).

To overcome these problems, there is a need to establish a high quality and rapid method of collecting data and a digital format for tracking and evaluating project-related entities (Kiziltas and Akinci, 2005). Also, it is a necessary to develop a system for monitoring the construction status and modifying the construction plan precisely along the overall construction progress.

In recent years, many researchers have applied sensor-based techniques to construction sites for monitoring construction project-related entities. For example, they are GPS (Global Positioning System), UWB (Ultra-Wide Band), and RFID (Radio Frequency Identifier). Additionally, there are also attempts to analyze image data from construction sites using big data (Han and Golparvar-Fard, 2017), artificial intelligence (Niu et al., 2019), and computer vision technology. Several articles provide a comprehensive review of their technologies (Omar and Nehdi, 2016; Edirisinghe, 2019).

In this context, Haas (2006) mentioned the need to monitor the movement of construction equipment and machinery to avoid loss and to improve productivity. The research on the monitoring of construction equipment used in civil engineering work has been done for a longer time compared to construction work. However, not only in civil engineering work but also in building construction work, the efficient use of construction equipment is key to ensuring the construction process as planned. For example, whether the lifting plan and management of cranes is properly carried out has a great impact on the construction schedule, cost-effectiveness, and safety. In the past, monitoring of cranes has been conducted for safety and maintenance purposes. Beyond such a purpose, monitoring the utilization rate of construction equipment could help identifying machines that are not being used efficiently. Machine procurement and machine placement plans can be properly modified with this analysis.

Sacks et al. (2005) made the first attempt in the construction industry to utilize safety devices attached to tower cranes to manage the progress of a construction project. Since the publication of this study, the idea of assisting construction project management by monitoring construction equipment has been spreading among several researchers. However, to the best of the authors’ knowledge, there are no articles that have conducted an extensive review of research aimed at progress monitoring.

Research Methodology

The acquisition of the publications was in two stages: comprehensive literature search and literature filtering.

In comprehensive literature search, the authors utilized Google Scholar by Google and ScienceDirect by Elsevier to find related publications and searched for relevant articles using the keyword search. The authors added words or phrases related to construction equipment (e.g., “construction equipment,” “mobile cranes,” “tower cranes”) after “construction progress monitoring by,” “AND” for a search.

When searching for articles, the authors did not specify the date of publication of the articles. Therefore, the authors included all the articles published by October 2020 that were accessible on the website. It may not be appropriate to rely on the selection criteria of Google Scholar and ScienceDirect because there is no perfect database, but it is most open to access. For each search attempt, the titles of the publications were manually checked and determined whether they were relevant to the research topic. Total 127 related papers were extracted.

In literature filtering, the authors read the selected literature closely and determined whether it is suitable for this literature review. Papers that described construction equipment but only described support systems during crane selection or papers that described only the summary of the other literature were also discarded.

Overall, 67 relevant publications were obtained by selection and supplement. These articles are from Automation in Construction, Journal of Computing in Civil Engineering, Advanced Engineering Informatics, Construction Management and Economics, Journal of Construction Engineering and Management, Safety Science, Advances in Mechanical Engineering, Journal of Information Technology in Construction (ITcon), Automation and Robot Applications, Autonomous Robots, Computer-Aided Civil and Infrastructure Engineering, Journal of Management in Engineering, Journal of Aerospace Engineering, Journal of Civil Engineering and Management, Journal of the Korea Institute of Building Construction, and Management, Procurement and Law.

The total of 59 journal papers and eight conference proceedings papers remained. This result is based on the authors’ subjectivity. However, since the purpose of this paper is to know the major trends in research, quantitative criteria are not necessary.

Results

Technology for Monitoring

During the investigation, the authors found that either data technologies embedded in the equipment, external to the equipment, or both were used to monitor.

While the data collection technology embedded in the construction equipment is only OBI (On-Board Instrumentation), the data collection technologies external to the equipment used were geospatial tools and imaging technologies. Geospatial tools allow site managers to track the location of an object. These include radio frequency identification, ultra-wide band tags, and global positioning systems.

Also, research on progress monitoring using imaging technologies has been rapidly generated in the research area these years. These include vision-based technologies and 3D laser scanning. Although it can be subdivided into smaller categories, the authors will describe these two technologies in this paper. Most recent research has been focusing on using digital images for progress analysis to generate 3D information about various objects on site.

The distribution of technology for monitoring construction equipment is shown as Figure 1. The most widely used technique is vision-based technologies, with which 22 studies are conducted. 3D laser scanning ranked second (11 times), followed by OBI, GPS, and UWB (nine times). The least used technologies are RFID, with seven papers. More information on each technology is further described in the following sub-sections.

FIGURE 1
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FIGURE 1. The distribution of technology for monitoring construction equipment.

OBI (On-Board Instrumentation)

OBI (On-Board Instrumentation) is an electronic device embedded in construction machinery and composed of different types of sensors such as inertial sensors, pressure sensors. It is originally used to collect data to prevent equipment failure or to detect anomalies for the purpose of improving safety (Kannan and Vorster, 2000).

The crane’s OBI includes an encoder sensor and a load moment indicator. Encoder sensors exist between the crane body and truck base. Or they exist between the boom and the crane boom. They can detect its rotation angle (Fang., 2018). Also, LMI (Load Moment Indicator) can calculate the overturning moment (load multiplied by the radius) on the crane and show it on the display (Fang et al., 2016). OBI and LMI are basic and well-known technology that has been with us for years. It comes equipped with heavy cranes from many crane manufacturers today and is commercialized as an overload prevention system. This system displays to the operator the crane’s rated capacity and the percentage of the moment caused by the lifted object and emits a warning sound when the moment exceeds a set threshold. Some operators released the safety device and steered the crane, which could cause an accident. In recent years, the safety device cannot be released.

Moreover, the data obtained by OBI can be extended to information about production activities beyond the contribution of the hardware aspect of the equipment and of assisting in its operation (Kannan and Vorster, 2000). Sacks et al. (2003; 2005) experimented with Potain’s “Dialog Visu” control system, which could record the weight and position of a hook in real-time. Although this system was originally developed to improve safety, Sacks et al. (2003; 2005) demonstrated that it could automatically record the cycle time of lift activity. Ahn et al. (2015) examined the feasibility of measuring the operational efficiency of equipment using low-cost accelerometers. Akhavian and Behzadan, (2015) trained supervised machine learning classifiers by extracting certain important features from the collected data using accelerometer and gyroscope sensors for detecting and classifying key activities performed in the field by various equipment and human crew. In addition to the raw data from the crane sensors. Ruikar and Amor (2019) monitored the masonry work progress by attaching RFID tags to the material. They calculate the work completion rate by combining the total weight of the suspended parts obtained from the crane sensors and the pallet ID data collected from the RFID tags.

OBI is a significant cost advantage because no additional sensors are needed. In recent years, construction equipment has been equipped with OBI as standard, so no additional cost is needed. However, there are several disadvantages to using OBI for progress monitoring. Ren and Wu (2015) used the boom head on a mobile crane and existing sensors (i.e., sensors for boom length, boom rotation angle, and elevation angle) to collect obstacle information. However, due to cable stretch and winch spooling, the encoder-based measurement of the cable length is an approximation, and so information accuracy is low (Lytle et al., 2004). Also, the data collected by OBI is not meaningful data for progress monitoring by themselves (Kannan and Vorster, 2000). As the experiments by Ruikar and Amor (2019), it must be combined with information about the state of the materials and the surrounding environment of the site to be an effective technique for progress monitoring. As far as safety is concerned, it is difficult to prevent the swaying of loads and collisions with other cranes and building structures. It is also a disadvantage that there are no sensors other than OBI.

Vision-Based Technologies

The monitoring activities using vision-based technologies conducted in the reviewed papers were divided into two stages.

The first stage of monitoring is the way of observing the situation in the field with a video camera. Many researchers have been studying video camera observation methods in the field with the aim of improving equipment operators’ visibility. For instance, Shapira et al. (2008) designed the live video system on a tower crane to improve the visibility of the operator during the lifting operation. Putnik et al. (2015) proposed a way to provide a crane operator with different views through the cameras mounted around the crane and for the object being handled by the crane. Chen et al. (2017) attached a wide-angle camera to the crane boom to track dynamic obstacles in the crane’s workspace. Besides, with the evolution of UAS (Unmanned Aerial System) in recent years, several studies have been conducted to adapt it to progress monitoring. Roberts et al. (2017) focused on how to track the location of a crane by imaging from multiple flying cameras.

The second stage of monitoring is the way of extracting and analyzing the information obtained from images and videos, called computer vision (Brilakis et al., 2011).

Computer vision is a technology that processes raw image information. It extracts the necessary image information, and it is used in various industries. It is allowed for site managers and workers to provide a wealth of information about the construction site by processing a large amount of image data about construction equipment and site environment, using computer vision technology. In other words, this technique can address the limitations of manual approaches to progress monitoring (Seo et al., 2015).

In recent years, researchers have conducted several studies to extract worker and equipment activity, productivity, and construction progress statistics through computer vision-based processing algorithms. Yang et al. (2015) noted that “a foreseeable future is that construction progress can be analyzed, and project schedule can be revised automatically through observation from the visual sensors.”

Ibrahim et al. (2009) presented a method for assessing the completeness of the structure by automatically interpreting images of the construction site. Gong et al. (2011) aimed to investigate the possibility of a new visual learning approach in classifying slight activity categories in various construction video segments. Kim et al. (2013) made inferences about construction progress by automatically updating the 4D model through an image processing approach. Tajeen and Zhu (2014) proposed a construction site image dataset to enable a computer-visioned method for automatically recognizing equipment on a construction site. Bügler et al. (2014) proposed a method for monitoring the progress of earthwork processes by computer vision. Han and Golparvar-Fard (2017) discussed the potential of big visual data used in conjunction with BIM to analyze construction performance. Also, they introduced model-driven visual analytics, which consists of computer vision and BIM to solve the lack of communication between stakeholders and management issues in the construction projects.

There are various benefits and various ways to adapt vision-based technologies to the construction site as mentioned so far. However, when a fixed-point camera is mounted on some structure to observe the site, there will be blind spots as the construction progresses. Besides, when the camera is mounted on a dynamic object such as a crane, the distance to the object changes (Eickeler and Jahr, 2017). It is a difficult problem to extract progress monitoring information from the image data by processing algorithms.

3D Laser Scanning

When operating construction equipment on a construction site, real-time information about the construction site environment is needed to prevent collisions with dynamic obstacles. Modeling the current construction site conditions and dynamics of the crane workspace is very important (Wang and Cho, 2015).

Ideally, the state of the site should be updated in real-time to capture small changes at any given moment. However, due to technical constraints, updating 3D geometry in real-time is difficult and costly even if it is possible (Fang et al., 2016). Graphical visualization is difficult in unstructured workplaces, such as construction sites, because of the unpredictability and rapid changes in work practices (Wang and Cho, 2015).

Laser-scanned point clouds can be used to understand the current state of the surrounding objects, including their shapes and colors, and are updated with a hybrid visualization approach that utilizes computer vision efficient data collection, computation, and comprehensive 3D geometric information contained in the point cloud (Chen et al., 2017). Cheng and Teizer (2014) identified blind zones that limit the crane operator’s visibility by measuring the condition and shape of the construction site through laser scanning. The framework proposed by Teizer and Cheng (2015) used commercially available wireless (RF) and GPS sensors to record the location of resources in real-time and used a laser scanner (once, at the time of the experiment) to capture the 3D environment as it was constructed. Fang et al. (2018) used point clouds collected by the laser scanner technique when modeling and updating the site conditions.

Thus, laser scanning technology has been used to collect static site environment information. It is often used in combination with other location-based technologies such as GPS and RFID. However, it has several limitations, because manual scanning is less accurate and time-consuming (Kim et al., 2011). A focus of future research will be to increase the speed of surface models by using more powerful computers and improving the quality of surface models (Wang and Cho, 2015).

GPS (Global Positioning System)

GPS (Global Positioning System) is widely used in various industrial sectors due to its ubiquity, high accuracy, and low cost. Since the early 2000s, it has also been used in the construction industry to prevent theft of civil engineering equipment.

Lee et al. (2002) investigated the possibility of improving crane operations by using a GPS. Oloufa et al. (2003) developed a vehicle tracking system using GPS technology to prevent collisions of multiple construction equipment during remote operation using video cameras. Navon and Shpatnisky (2005) developed an automated data collection model using GPS technology to generate the information needed for efficient monitoring of road construction. Abderrahim et al. (2005) carried out the monitoring with small location-based communication instruments attached to a safety helmet, which is required for all workers, to ensure that workers do not suffer from accidents related to falling from a high place or collision with dangerous objects.

GPS has also been applied in the construction industry for material location tracking (Caldas et al., 2006; Song et al., 2006), resource management (Gong and Caldas 2008), and safety management (Teizer et al., 2007), as well as for safety and productivity purposes. In a recent study, Alshibani and Moselhi (2016) proposed a system to collect samples of GPS data in real-time. The data captured by the GPS receiver will be utilized to estimate the cycle time of the equipment.

When obtaining object location information, GPS has the advantage of being able to obtain x-, y-, and z-coordinates with only one GPS unit, which can be easily applied in a wide external work environment (Yun and Lee, 2010). However, compared to the use of GPS in open areas such as civil engineering sites, the poor positioning performance of GPS in dense urban construction sites causes the data accuracy and reliability to be very low. This also occurs when used in indoor environments (Abderrahim et al., 2005). Therefore, the authors need to think about where to use GPS in order to apply it effectively for progress monitoring purposes.

RFID (Radio Frequency Identifier)

RFID (Radio Frequency Identifier) identifies a specific target through radio signals. Depending on battery usage, RFID systems can be classified as active, semi-passive, or passive. An active RFID system can continuously update information in real- time by transmitting information wirelessly to the tags (Ergen et al., 2007; Grau et al., 2009). On the other hand, a passive RFID system is ideal for indoor construction applications because of its various advantages in terms of cost, lifetime, and size (Vogt and Teizer, 2007).

Caron et al. (2006) listed the following three potential impacts of RFID in the construction industry. 1) Improving real-time project management and control through analysis of work productivity by tracking materials, 2) Saving time and costs, and 3) Possibility of extending the functionality to safety applications.

Most of the articles on RFID utilized it for material tracking purposes. Yun and Lee (2010) developed and utilized a Zigbee-based wireless recognition tag device. When a worker finished preparing for the lift, the manager pressed a button on the radio-recognition tag, and the RFID information of the component was automatically signaled and stored on a server that was a long-distance away. Cho et al. (2011) developed a material management system that utilizes RFID and USN (Ubiquitous Sensor Network) to obtain information on the movement of materials. Li Y. et al. (2013) developed a real-time monitoring system that integrates GPS and RFID. This system is intended to detect and warn workers of their entry into a predetermined risk zone by acquiring the location of both the site crew and the crane.

Also, RFID can store additional data, such as historical information and technical specifications, in addition to identification data. Integrating with various sensors allows the data collected by those sensors to be stored in RFID tags (Taneja et al., 2011). On the other hand, RFID has a major disadvantage that must be overcome. When used with metallic materials, RFID’s error rate increases (Lee et al., 2006).

UWB (Ultra-Wide Band)

UWB (Ultra-Wide Band) means an ultra-wideband wireless system. This is a wireless communication technology that uses a wide frequency band to enable high-speed communication over short distances. It is usually used in communications for short distances. Because the radio waves in each frequency band are weak, the communication is fast and stable. The possibility of interference with other wireless devices is low. Thus, the accuracy of position detection is very high, with an error margin of a few centimeters.

In the selected papers, UWB was used to track the location of various dynamic objects. Zhang et al. (2009b) collected raw data using the UWB system software showing the tag’s name, date, time, and the x-, y-, z- coordinates. Zhang et al. (2012) studied how to estimate the pose of a crane boom by data collected using UWB and processed it into information that can be used for collision avoidance and path replanning. Cheng and Teizer (2013) captured the activities of a mobile crane by multiple UWB tags. They attached four UWB tags to the outriggers, one to the structural frame of the crane cabin, and another to the crane hook to calculate the orientation of the crane boom. In determining the number of tags to be placed on the monitored object, it is necessary to take into account the degree of freedom of the monitored object (Zhang et al., 2009b). Shahi et al. (2013) employed the UWB positioning system as part of an innovative data collection system for capturing job data on construction projects. Workers and inspectors could track specific activities that take place at the location of the tag by temporarily placing a tag on the installed material. Teizer and Cheng (2015) developed a framework that incorporates a UWB to allow equipment operators to accurately determine the location of equipment and assess the possibility of equipment collisions in real-time.

In addition to the above mentioned several advantages, UWB has the advantage that it does not need to be integrated with other technologies to provide accurate 3D position estimation (Hwang, 2012). On the other hand, UWB’s main limitation at this point is a necessary measurement infrastructure (Teizer et al., 2007). As with RFID, obstructions and metal interference in the work environment have a significant negative impact on the accuracy of UWB positioning (Li et al., 2016).

Integration of Visualization With Monitoring

Integration of the geometrical representation of a building with other types of data, such as time and cost, has been a topic for many research and development efforts (Hammad, 2007).

To improve safety during crane operation, the simulation of cranes in a virtual space (Kang and Miranda, 2006; Zhang et al., 2009a), visualization (Giretti et al., 2009; Kang et al., 2009), the definition of safe areas (Ren and Wu, 2015), and others have been developed.

Visualization and simulation will allow site workers and site managers to understand the situation and work schedule at the site from their perspective. This makes communication smoother and more efficient, which reduces the potential for misunderstandings between the parties involved. Also, it greatly improves the accuracy of the schedule (Kang and Miranda, 2006).

BIM and VR are integrated with the monitoring technologies described before. The integration of visualization with monitoring is described in the following sub-sections.

BIM (Building Information Modeling)

Recent developments in the field of BIM have enabled vast amounts of information to be stored in a computer-interpretable format (Ibrahim et al., 2009). In the construction phase, BIM is expected to provide essential information for analysis and monitoring of the process, such as construction progress and tracking of construction resources (Fang et al., 2016).

With regard to tracking construction resources, it is necessary to establish an automated material resource tracking system in order to avoid project delays, and to reduce waste. The spending of material resources can effectively serve as an indirect measure of a project’s progress (Rebolj et al., 2008).

A variety of research has been conducted to improve safety in the operation of construction equipment. The research is based on the technologies such as the automatic generation of crane lifting paths, provision of 3D information to operators, warning to the workers of hazardous areas, and identification of hazards through simulation. The system developed by Lee et al. (2009) collects and displays the location of the lifted object in real-time on the BIM model. The lifted route is generated from the BIM database when the worker acquires a material ID. Lee et al. (2012) developed a system that collects location on a BIM model of a lifted object in real-time and displays the 3D building on a monitor in the cabin of a tower crane or the machine control room. Li H. et al. (2013) developed a system that captures worker and crane-positioning information and integrates 3D positional data into a BIM environment in order to prevent workers from entering hazardous areas. Zhang et al. (2015) performed two 4D simulations in BIM and identified potential struck-by and worker hazards. By comparing the two results, they could determine the level of safety performance expected at a construction site. Liang et al. (2018) presented a real-time construction site layout and equipment monitoring system using BIM.

When it comes to construction progress monitoring, it is much more efficient to share the progress by visualizing the difference between as-planned model and as-built status in BIM than to compare images and Gantt charts that show the current situation (Han and Golparvar-Fard, 2017). Li et al. (2018) used a BIM model captured in a web-based operational platform to visualize the progress of precast construction in real-time, displaying the status of the precast during fabrication, transportation, arrival on-site, and erection with color-coding. By visualizing the progress of domestic construction and the progress in the field in real-time, it is possible to check and understand the delays in precast production and delivery. Such progress visualization allows for more efficient communication and coordination between the management team and field workers than in the past (Fang et al., 2016).

VR (Virtual Reality)

Many researchers are attempting to combine VR (Virtual Reality) technology with existing sensing technologies for construction management in the pre-construction stage and construction stage.

In the pre-construction stage, it is necessary to identify and eliminate problems and risks early, before the actual construction begins. The main factors that cause construction accidents include lack of site layout, multi-interface, safety screens and scaffolding, multi-plant, construction operations, and safety training, etc. Kang et al. (2009) presented a study to achieve 3D simulation and animation of the construction process. Guo et al. (2013) proposed a conceptual framework for applying VR technology to construction safety management. However, VR models used in planning and other applications are based on simulated or pre-recorded data, and so far the application of VR at the construction work level has not been very common.

One of the significant challenges of leveraging VR in the construction phase is the integration of captured data in real-time (Cheng and Teizer, 2013). Also, accurately tracking the 3D position of dynamic objects and recognizing their orientation is very important for real-time VR applications. The methods for tracking dynamic objects include tracking the position of the crane using a UWB system (Zhang and Hammad, 2012; Cheng and Teizer, 2013). There are also methods of collecting obstacle information using the boom head on a mobile crane and existing sensors (i.e., sensors for boom length, boom rotation angle, and elevation angle) (Ren and Wu, 2015), and collecting site environment information through point clouds generated from images recorded by crane-based cameras (Eickeler and Jahr, 2017).

The research field of integrating the sensing technology used in the above-mentioned methods with VR technology is an area of growing interest for several researchers in recent years. For instance, Kan et al. (2018) applied CPS (Cyber-Physical System) to mobile crane planning and operation to enhance bi-directional coordination between physical components of the construction site and virtual representations to address the dynamic environment of a construction project. However, there are several difficulties in estimating accurately the movement of mobile cranes and ensuring the reliability of the collected data. To address these difficult issues, significant investment and empirical data collection from practical case studies are required.

Besides, project stakeholders (equipment operators, field workers, and safety management commands) can make more informed decisions in a shorter time and at a lower cost by monitoring video data processed live in the VR world (Kang and Miranda, 2006; Cheng & Teizer, 2013). An experiment by Rebolj et al. (2008) reported that project participants residing in a virtual workspace established cross-functional/organizational communication and avoided the traditional chain of command.

Barriers of Visualization

On the other hand, there are several barriers to implement VR technology.

First, VR technology requires considerable early-stage investment for software and hardware. Investment before the guaranteed benefits can be a barrier to some stakeholders.

Secondly, it can be difficult to sense data from VR technology because those data are particularly vulnerable to the interference of other signals.

Lastly, there is still a delay in real-time visualization of the data, and therefore there is a need to minimize the delay and ensure timely control feedback (Kan et al., 2018). Overcoming these barriers will require more research in the future.

Discussion

Objectives of Monitoring

The authors divided the objectives of monitoring in the past research into four categories. The objectives of each study, the technologies applied, and each objective of monitoring are shown in Table 1. The brackets next to the technology represent the number of references.

TABLE 1
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TABLE 1. A list of objectives and targets of the technology.

Improvement of Safety in Equipment Operations

It is shown that the general objective of monitoring is improvement of safety.

Errors in the operation of equipment at construction sites are a major cause of construction accidents such as falls, collisions with structures, and collisions with other cranes. This is mainly due to the presence of various dynamic obstacles on the construction site, in addition to operator visibility issues such as blind spots (Kim et al., 2006). To operate construction equipment safely and effectively, the dynamic spatial information on a cluttered construction site needs to be collected quickly. Several field safety devices have been developed that, if properly utilized, could reduce the number of crane-related injuries and fatalities, but the extent and effect of their utilization are unsatisfactory (Li and Liu, 2012). Therefore, in addition to monitoring the construction equipment, it is necessary to monitor the site environment, workers, and other cranes.

The technical development is important, but the discussion about responsibility of general contractors is not enough. For example, who covers responsibility for crane operator’s mistake? If the responsibility of the general contractor does not change, even cranes equipped with new technologies will not be used very often.

Improvement of Productivity in Equipment Operations

Construction equipment productivity analysis is the most essential construction equipment management practice that has the potential to improve the productivity of construction projects (Gurmu and Aibinu, 2017). The data obtained by tracking construction equipment can be useful for managers to understand and monitor site performance and conditions, as well as potentially improve the cost efficiency, operability, and safety of cranes (Kim and Chi, 2017). Most of the studies monitored only construction equipment and analyzed the data obtained.

Such techniques may certainly be useful in finding delays in construction. However, the data presented in these studies are already available to site managers. It is necessary to clearly indicate that there are many breaks in the operating hours of the crane and increase the operating rate of the crane operators. It should be noted that the number of excellent crane operators will decrease in the future. It is important to be able to operate the crane even by unskilled workers.

Automating Equipment Operations

To automate the operation of construction equipment, sensors are introduced to enable any reaction to dynamic changes within the worksite without human intervention (Lytle et al., 2004). Therefore, it is necessary to monitor both the site environment and dynamic objects.

Currently, unmanned cranes are not allowed due to legal restrictions. Unmanned cranes will not be preferred unless the general contractor’s responsibilities are reduced. However, unmanned cranes may be required in combination with construction robots at construction sites in harsh conditions that are inaccessible to workers, for example, inside of nuclear power plants, disaster recovery works, and construction sites in deserts and mountains.

Progress Monitoring and Decision-Making Support

Besides the research objectives closed to the machine itself, there are several studies aimed at improving the quality of project management and decision support.

To improve the quality of project management and support decision-making, including improving productivity other than machinery, it is necessary to monitor the situation at construction sites as well as construction equipment. In recent years, many researchers have used BIM and VR technologies to visualize and simulate the construction phase. If there is a lack of detailed information about the activities where the crane is used and about the environment around the crane, the results of the visualization and simulation will be inaccurate (Li H. et al., 2013). Therefore, most studies used multiple technologies to collect information. They applied various techniques and algorithms to analyze that information.

These techniques are useful for instructing construction workers about the work of the day. The evaluation from the workers is also high. However, it should be noted that visualization techniques are not so much needed in construction planning. Unless it is a building with a very large building area, construction planning is possible without such technology.

Future Development Issues

In this research, the authors reviewed many papers on cranes. The development of various technologies is categorized, but there is a lack of discussion about changes in crane users and changes in organizational responsibilities including general contractors.

If the crane can be operated by non-skilled operators, the shortage of future operators will be alleviated. If another kind of worker operates the crane, the waiting time will be shortened and the work efficiency will be improved.

The general contractor’s responsibility for safety remains unchanged. So, new technology should not be aimed at reducing the number of site managers in general contractor, but rather at reducing the burden on site managers.

Conclusions

This research aimed to explore how construction equipment, such as cranes, can support project management. Cranes can monitor other objects and cranes can also be monitored as well as their original work. Therefore, the authors applied a two-stage literature review to search for state-of-the-art literature. As a result, the authors found the following four points.

1) Most of the studies were focused on digitalization and review of the lifted path for safety improvement. However, few studies have focused on progress monitoring and decision-making support. There is room for further research and development in this field.

2) The monitored object is not limited to construction equipment, but also extends to workers, construction materials, and even the activity itself, even in the case of monitoring construction equipment. The research aimed at improving safety requires information about the location of the equipment as well as the surrounding environment when operating the equipment. In such cases, advanced systems using a plurality of the aforementioned techniques have been devised.

3) There are various objects on a construction site. So the appropriate technology to collect and track information is different, depending on the nature of them. For instance, imaging technologies such as computer vision and 3D laser scanning are used to collect and track information on static or semi-static objects such as area topography, structures, and material depots. On the other hand, geospatial tools such as GPS or UWB are used to collect and track information on dynamic objects, e.g., construction equipment, material, and worker.

4) In the case of research aimed at improving machine productivity, progress monitoring, and decision-making support, only the construction equipment or the field environment is monitored. However, for more effective progress monitoring and decision-making support, site managers need to expand the scope of monitoring, since external factors such as lifting materials, workers, delivery, and weather conditions are also significantly responsible for progress monitoring.

Consequently, research into applying a system that aims to improve safety to progress monitoring, a system that can monitor multiple sites, or a system that fuses collected information is a necessary research field in the future. Meanwhile, the study of Kan et al. (2018) deals with physical components and information flow in virtual space. This is a very interesting area for future research as it allows multiple in-situ data to be reflected in modeling in virtual space Azimi et al., 2011, Azuma et al., 2001, Costin et al., 2012, Irizarry and Costa, 2016, Lu et al., 2007, Naticchia et al., 2013, Ren et al., 2017, Stone et al., 1999, Teizer et al., 2010, Yang et al., 2014.

Author Contributions

YN mainly wrote this paper and TK and SN provided guidance and corrections to complete this review.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s Note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Acknowledgments

The authors are grateful to Masaaki Wagawa for helpful discussions and advice based on work experience.

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Keywords: construction equipment, crane, project management, process monitoring, BIM – building information modeling

Citation: Nakanishi Y, Kaneta T and Nishino S (2022) A Review of Monitoring Construction Equipment in Support of Construction Project Management. Front. Built Environ. 7:632593. doi: 10.3389/fbuil.2021.632593

Received: 23 November 2020; Accepted: 20 December 2021;
Published: 19 January 2022.

Edited by:

Zhen Chen, University of Strathclyde, United Kingdom

Reviewed by:

John Schaufelberger, University of Washington, United States
Aviad Shapira, Technion Israel Institute of Technology, Israel

Copyright © 2022 Nakanishi, Kaneta and Nishino. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Yutaro Nakanishi, nakanishi_crcl_yutaro@yahoo.co.jp

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