JP2012056753A - Construction monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction monitoring system by which the progress of a construction can be recognized more precisely at a construction site where a tower crane is employed.SOLUTION: The construction monitoring system includes: a detection unit for detecting the position of a tower crane jib; a calculation unit for calculating the position of a suspended load based on the detected jib position by the detector and construction data in which a predetermined position to which a construction material to be carried is recorded in association with construction material identification information; a determination unit for determining the completion of the lifting of the construction material, and outputting the suspended load end position when the lifting is ended; and a specification unit for specifying by comparing the suspended load end position and the construction data, the construction material identification information in the construction data.

Description

  The present invention relates to a construction monitoring system for managing the progress of construction at a construction site, and more particularly to a construction monitoring system at a construction site using a tower crane.

  Currently, in the process plan at the construction site, the number of working days is obtained based on the step measured at the other site, but the actual work at the site does not always go as it is. Usually, the first cycle in the process plan is given a margin, it is grasped whether there is a problem with the planned progress, and the input heavy machinery and the input artificial maneuver are reviewed in the next cycle. However, at the time of review, it is necessary to examine various patterns and construction methods, so it is not possible to easily examine them.

  As a system for supporting process planning at such a construction site, Patent Document 1 describes building data on building components based on architectural design, temporary construction, heavy machinery, etc., each work / process from start to completion based on the process plan. A process plan management support system is disclosed that inputs comment data corresponding to construction data relating to the schedule and actual results, and outputs comments associated with building data and construction data.

  According to the process plan management support system disclosed in this patent document 1, since information related to various media is output as a comment for any work, date, and member on the process chart, It becomes possible to express and provide information related to process planning and management in an easy-to-understand manner.

Japanese Patent Laid-Open No. 9-268760

  On the other hand, in construction management at a construction site, it is necessary to check the actual construction status and monitor whether or not construction has been performed as planned against the process plan. Currently, a monitoring system using an IC tag is known as such construction monitoring. In this system, the construction status can be managed by causing the portable information terminal or the like to read the IC tag attached to the building material at an appropriate timing such as when the building material starts to be attached and when the attachment is finished.

  However, in such a construction monitoring system, manual input work is required, so it was impossible to accurately monitor the construction status due to forgetting to input or input errors. Moreover, it is a very time-consuming work.

In order to solve the above problems, a construction monitoring system according to the present invention is a construction monitoring system in a construction site that uses a tower crane. The construction data recorded in association with the identification information, the calculation means for calculating the suspended load position based on the jib position detected by the detection means, the construction material is judged to have been suspended, and the suspension load is terminated. And determining means for outputting the suspended load end position, and specifying means for specifying the building material identification information in the construction data by comparing the suspended load end position with the construction data.

  Furthermore, in the construction monitoring system according to the present invention, the determination unit outputs a suspended load end time at the end of the suspended load, and the specifying unit associates the identified building material identification information with the suspended load end time. It is characterized by recording.

  Furthermore, in the construction monitoring system according to the present invention, the determination means determines that the building material has been suspended, outputs a suspended load start time at the beginning of the suspended load, and the identification means identifies the identified building. Material identification information and the suspended load start time are recorded in association with each other.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the detection means detects the elevation angle and the turning angle of the jib as a jib position.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the detection means is at least one GPS sensor installed in the jib.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the judging means judges the end of the suspended load on condition that the jib is stationary for a predetermined time or more.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the determination means determines the end of the suspended load by using a weight sensor that detects the amount of the suspended load.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the judging means judges the end of the suspended load only when the suspended load position is located within a predetermined construction area.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the specifying means confirms a suspended building material based on weight information detected by a weight sensor that detects a suspended load.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the specifying unit confirms a suspended building material based on image information captured by the imaging unit.

  Furthermore, the construction monitoring system according to the present invention is characterized in that the specifying means confirms a suspended building material based on surrounding information measured by a range sensor.

  The present invention pays attention to the fact that the suspended load end position of the building material in the tower crane is substantially equal to the planned transfer position of the building material. The construction materials that have been identified are identified, enabling highly accurate construction monitoring.

  Furthermore, in the construction monitoring system according to the present invention, it is possible to grasp the conveyance status of each building material in the whole construction by recording the identified building material and the suspended load end time in association with each other.

Furthermore, in the construction monitoring system according to the present invention, it is possible to grasp the conveyance status of each building material in the entire construction by associating and recording the specified building material and the suspended load start time.

  Furthermore, in the construction monitoring system according to the present invention, the suspended load position is determined by detecting the elevation angle and the turning angle of the jib in the tower crane. The tower crane is equipped with an area keeper that outputs the elevation angle and turning angle of the jib to avoid contact and collision with others. By using the output from the area keeper, it is possible to detect the jib position without providing a further sensor.

  Furthermore, in the construction monitoring system according to the present invention, the suspended load position is determined by installing at least one GPS sensor on the jib in the tower crane. When a GPS sensor is used, position information not only in the horizontal direction but also in the vertical direction can be acquired, so that construction monitoring with higher accuracy can be performed. Moreover, since the time information is also included in the GPS information acquired by the GPS sensor, it is possible to improve the accuracy of construction monitoring by using the time information acquired by the GPS sensor.

  Furthermore, in the construction monitoring system according to the present invention, the end of the suspended load is determined on the condition that the jib has been stationary for a predetermined time or more. The jib of the tower crane needs to be stationary until a certain amount of installation is completed by manual work after the building material is transported to the target installation position. By detecting that the jib has been stationary for a predetermined time or more, it is possible to determine the end of the hanging of the building material.

  Furthermore, in the construction monitoring system according to the present invention, the end of the suspended load is determined by using a weight sensor that detects the suspended load amount. The tower crane is provided with a weight sensor for monitoring the suspended load so as not to exceed the rated load. Using this weight sensor, it is possible to determine the end of the suspended load by detecting the change in the suspended load amount.

  Furthermore, in the construction monitoring system according to the present invention, the suspended load position is determined so that the suspended load position is determined only when the suspended position of the tower crane is located within a predetermined construction area. Excluding the case where it is located outside the construction area such as the carry-in area, it becomes possible to perform the suspended load end determination with higher accuracy.

  Furthermore, in the construction monitoring system according to the present invention, the construction material suspended by the weight information of the construction material detected by the weight sensor is confirmed to reduce the specific error of the construction material. It can be confirmed by comparing the weight information of the building material included in the construction data with the detected weight information.

  Furthermore, in the construction monitoring system according to the present invention, specific construction material errors are suppressed by confirming the suspended building materials using image information captured by the imaging means. As a specific confirmation method, using image recognition technology, the shape of the building material included in the construction data and the shape of the building material extracted from the image information are collated, and the image is presented to the administrator on the display means. It may be possible to check the

  Furthermore, in the construction monitoring system according to the present invention, the building material specific error is reduced by confirming the suspended building material using the surrounding information acquired by the range sensor. Here, the range sensor is an optical scanning type distance measurement sensor that can irradiate the surrounding with laser light, measure the distance to the surrounding object, and acquire the surrounding object as a three-dimensional shape. Using the surrounding information acquired by this range sensor, it is possible to check by comparing with the shape data shape of the building material included in the construction data, or by presenting it with the display means.

External view of a tower crane installed at a construction site. The figure explaining the suspended load position detection of the tower crane which concerns on embodiment of this invention. The figure which shows the structure of the construction monitoring system which concerns on embodiment of this invention. The figure which shows the process of the construction monitoring system which concerns on embodiment of this invention. The figure for demonstrating the process data (construction data) which concerns on embodiment of this invention. The figure which shows the material data which concern on embodiment of this invention, material attribute data (construction data). The figure explaining the judgment of the hanging load end which concerns on embodiment of this invention. The figure which shows the mode of a display of the construction monitoring system which concerns on embodiment of this invention. The figure which shows the detection means which concerns on other embodiment of this invention. The figure which shows the structure of the construction monitoring system which concerns on other embodiment of this invention.

  FIG. 1 is an external view of a tower crane installed at a construction site. As shown in the figure, the tower crane 10 is installed at an upper part of a building construction site or the like, and conveys the building material raised from the carry-in position to a position where it should be installed.

  The tower crane 10 includes a tower 15 installed at a construction site, a swivel frame 16 that can be swiveled at the top of the tower 15, a driver's seat 14, a jib 11 that can be angle-changed on the swivel frame 16, a jib 11 includes a hanging wire 12 suspended from the tip of 11 and a hook block 13 that loads a building material 31 at the tip of the hanging wire 12 as main components.

  In this tower crane 10, the swing frame 16 is rotated on the tower 15, the angle (elevation angle) of the jib 11 on the swing frame 16 is changed, and the amount of the suspended wire 12 is fed by the hoisting means. By changing the above, it is possible to transport the building material 31 to a desired position.

  The building material is transported by the tower crane 10 to a position where it is mounted, and a manual mounting operation is executed. When the attachment is sufficient, the building material is removed from the hook block 13 and moved to the carry-in position for transporting the next building material. The present invention focuses on the fact that the building material is transported by the tower crane 10 to the attachment position, that is, the suspended load end position of the tower crane 10 is substantially equal to the attachment position.

  FIG. 2 is a diagram illustrating detection of a suspended load position of a tower crane according to an embodiment of the present invention. FIG. 2A is a side view of a construction site where the tower crane 10 is installed, and FIG. Shows a top view of the construction site. In addition, this embodiment grasps | ascertains the progress condition for every hierarchy of a building, Comprising: In order to grasp | ascertain about a hierarchy, the instruction | indication that a hierarchy is different is given, or the position of a perpendicular direction is detected. Is needed.

  Here, a coordinate system is set in which the horizontal plane is the XY plane and the vertical (gravity) direction is the Z axis. The jib 11 can change the elevation angle α on the revolving frame 16. Further, the turning frame 16 is turnable on the tower 15, and an angle from a reference direction (here, the X direction) is set as a turning angle β. Actually, the rotation origin of the jib 11 on the XY plane is different from the rotation origin of the revolving frame, but here it is assumed to be located at the same position in order to simplify the calculation. In this embodiment, the coordinate system is determined based on the rotation origin of the tower crane 10. However, the coordinate system may be determined by taking an appropriate position on the building side as the origin. Moreover, the positional relationship between the tower crane 10 and the building is held in advance as data, and is used to calculate the suspended load position.

The length Lxy of the jib 11 on the XY plane is determined by the length L of the jib 11 and the elevation angle α of the jib 11.
Lxy = L * cosα
It can be expressed as. Moreover, the suspended load position A of the tower crane 10 on the XY plane, that is, the projected position of the suspended wire 12 and the hook block 13 on the XY plane is
A (x, y) = (Lxy * cosβ, Lxy * sinβ)
Calculated by In the present embodiment, the suspended load position A is used to determine the building material transport destination, that is, the suspended load end position. Here, the suspended load position A is calculated on the assumption that the rotation center of the jib 11 and the rotation center of the revolving frame 16 are the same.

  Thus, in this embodiment, the elevation angle α and the turning angle β of the jib 11 are used as the jib position. For these detections, it is conceivable to use an output from an area keeper provided in the tower crane 10 for the purpose of avoiding contact and collision with others. By using the area keeper as the position detecting means of the jib 11, the position of the jib 11 can be detected without providing a further sensor.

  In the present embodiment, the projection position on the XY plane is used as the suspended load position A of the tower crane 10, but the suspended position on the Z axis such as the hook block 13 may be used. In this case, the height z from the reference position can be detected as appropriate by detecting the amount by which the suspended wire 12 is fed out by the hoisting means. By using the suspended load position on the Z axis and grasping the suspended load position three-dimensionally, it is possible to realize construction monitoring with higher accuracy.

  Now, the construction monitoring system according to the present embodiment will be described with reference to FIGS. FIG. 3 is a diagram illustrating a configuration of the construction monitoring system according to the present embodiment. The construction monitoring system in this embodiment has the detection means 21 and the information processing apparatus 20 as main components.

  The detection means 21 is a means for detecting the position of the jib 11 in order to calculate the suspended load position A of the tower crane 10. In the embodiment described in FIG. 2, the area for detecting the elevation angle α and the turning angle β of the jib 11. A keeper or the like corresponds to this. The information processing device 20 can be a general-purpose device such as a personal computer, and is installed in the cab 14 of the tower crane 10 or the like. Note that the information collected by the detection means 21 may be transmitted to an external server or the like via a network and processed by the external server.

  The information processing apparatus 20 includes a control unit 22, a storage unit 23, a display unit 24, a communication unit 25, and the like. The control means 22 is constituted by a CPU or the like, and is means for enabling various processes. In the present embodiment, various functions such as the calculation unit 22a, the determination unit 22b, and the identification unit 22c are realized by the installed program. The storage means 23 is composed of a hard disk or the like, and is means for storing construction data and various collected information. The display means 24 is means for presenting visual information, and is used when displaying the processing result to the administrator. The communication unit 25 is a unit that enables communication with an external server or the like, and enables transmission and reception of various necessary information and processing results.

  FIG. 4 is a flowchart showing processing of the construction monitoring system according to the embodiment of the present invention. The transported building materials are identified by applying a series of processes shown in this figure to one transport process of the tower crane 10.

5 and 6 are diagrams showing construction data according to the embodiment of the present invention. FIG. 5 is a diagram visually representing the process data in the construction data, and FIG. 6 is the material data in the construction data.
It is the figure which showed an example of the item which material attribute data has. These construction data are stored in the storage means 23 described with reference to FIG.

  As shown in FIG. 5, a building material used for a building is assigned a material ID (building material identification information) that can identify each building material. Moreover, the scheduled period of the conveyance work and attachment work by a tower crane is set to each building material. These scheduled periods are construction schedules determined based on previous construction experience. In the figure, it is visually displayed as a Gantt chart for easy understanding. In the figure, the hatched frame indicates the scheduled transportation period by the tower crane, the left end indicates the suspended load start scheduled time, and the right end indicates the suspended load end scheduled time. Further, the white frame indicates a manual attachment scheduled period, the left end indicates the scheduled start time of attachment, and the right end indicates the estimated end time of attachment.

  Fig.6 (a) is the figure which showed the material data in construction data. The material data is associated with the construction data and the material ID shown in FIG. 5 and includes a scheduled transfer position and a material attribute ID. The scheduled transfer position is data corresponding to a position where the building material is transferred and attached, and has at least position information on the XY plane. By using the planned transfer position considering the position of the center of gravity of the building material, it is possible to increase the specific accuracy of the building material.

  This material data may be acquired from CAD data used at the time of building design. Further, the scheduled transfer position may include not only position information on the XY plane but also position information on the vertical (on the Z axis). When the position information on the vertical can be acquired by the detection means 21, it is possible to determine the level under construction, and the accuracy of identifying building materials is improved.

  In FIG. 4, when the process is started in S101, it is first determined whether or not the tower crane 10 has detected the start of a suspended construction material load. This determination is made on condition that the suspended load position of the tower crane 10 is located in the carry-in area shown in FIG. 2 or that the weight sensor of the tower crane 10 detects that a predetermined weight or more has been loaded. be able to. When it is determined that the suspended load of the building material has been started, the suspended load start time is recorded in S103.

  In S104, it is determined whether or not the end of the hanging of the building material is detected by the determination means 22b. When the end of the suspended load is determined, the suspended load position A calculated by the calculating means 22a is recorded as the suspended load end position, and the time at that time is recorded as the suspended load end time. Various methods can be used to determine the end of the suspended load. An example of the determination method will be described with reference to FIG.

  FIG. 7 is a diagram for explaining the determination of the end of the suspended load using the operation status of the tower crane, and shows the transition status of the turning angle of the jib 11. Period A indicates a period in which building materials are suspended in the carry-in area. In the period B, the fluctuation of the turning angle when the building material is transferred to the planned transfer position by turning the jib 11 is shown. In the present embodiment, the end of the suspended load is determined on the condition that the jib 11 is stationary for a predetermined period. As shown in the figure, the end of the suspended load is determined when a predetermined time T has elapsed since the start of rest. In addition, although it demonstrated only with the turning angle of the jib 11 here, it is good also considering adding the elevation angle of the jib 11 or the operating condition of the hanging wire 12 besides this.

The determination of the end of the suspended load may be made based on the fluctuation status of the weight sensor of the tower crane, that is, the suspended load amount is reduced in addition to the operation status of the tower crane. Furthermore, it may be determined that the jib 11 has started to move for the transportation of the next building material, or may be determined by combining a plurality of conditions. The end of the suspended load may be determined only when the suspended load position A is located within a predetermined construction area. By excluding the carry-in area and the like, it is possible to make the determination of the end of the suspended load more accurate.

  In S106, the material ID is specified by comparing the suspended load end position recorded in S105 with the scheduled transfer position in the material data (part of the construction data) in FIG. This specification is executed by comparing with the construction data stored in the specifying unit 23 by the specifying unit 22c. In comparison, since the building material may not be accurately transported to the planned transport position, it is advisable to have some error. When the hierarchy under construction is specified, it is possible to specify the building material by comparison at least on the XY plane, and the comparison on the Z axis is not necessarily performed.

  In S107, the suspended load end time recorded in S105 and the suspended load start time recorded in S103 are recorded in association with the material ID specified in S106. In order to accurately grasp the work status of the tower crane, it is preferable to record both the suspended load start time and the suspended load end time in association with each other. For example, only one of the suspended load start time and the suspended load end time may be recorded.

  By repeatedly executing the above processing, it is possible to monitor the transport status of each building material. FIG. 8 is a diagram illustrating a display example of the construction monitoring system according to the embodiment of the present invention. Here, it is displayed using the Gantt chart used for the description of the process data in FIG. 5, and in addition to the process data in FIG. 5, the operation period of the tower crane is indicated by a gray frame. The left end of the gray frame indicates the suspended load start time, and the right end indicates the suspended load end time. In this way, by displaying the actual operation period corresponding to the scheduled transfer period by the tower crane, it is possible to easily grasp the actual execution status with respect to the execution schedule.

  As described above, the construction monitoring system according to the embodiment of the present invention has been described. However, according to the present invention, the construction material transported by determining the suspended load end position of the construction material by the tower crane is specified, and the construction with high accuracy is performed. Monitoring is possible. Note that the processing described with reference to FIG. 4 does not need to be performed in real time, and data from the detection unit 21 or the like may be accumulated and performed afterwards based on the accumulated data.

  In the above-described embodiment, the elevation means and the turning angle of the jib 11 by an area keeper or the like are used as the detection means 21, but a GPS sensor may be used as the detection means 21. FIG. 9 is a diagram for explaining various detection means 21 using a GPS sensor.

  FIG. 9A shows a form in which two GPS sensors 21a and 21b are installed, and the two GPS sensors 21a and 21b are installed on the jib 11 with appropriate intervals. Thus, by providing the two GPS sensors 21a and 2b and taking the difference between the detected position information, the elevation angle and the turning angle of the jib 11 can be calculated as in the above-described embodiment.

  FIG. 9B shows a form in which one GPS sensor 21 c is attached to the tip of the jib 11. In such a form, the position information output from the GPS sensor can be used as it is as the suspended load position.

  FIG. 9C shows a configuration in which one GPS sensor 21d is attached to the hook block 13 or the like, so that the vertical load position can be directly detected in addition to the plane load position.

As described above, in any of the embodiments, the GPS sensor 21 is housed and installed in a case considering waterproof and heat resistance. Moreover, acquisition of various signals from the GPS sensor 21 may be performed by a cable or may be performed wirelessly. The power supply to the GPS sensor 21 may be performed by a cable or via a battery. Currently, many GPS sensors are connected to a general-purpose personal computer using a USB cable. However, when such a USB cable is used, there is a limitation on the cable length. Such an embodiment is convenient.

  In the previous embodiment, the suspended material end position and the scheduled transportation position are compared to identify the suspended material ID. However, the embodiment is intended to further identify the material ID. This will be described with reference to FIG.

  FIG. 10 is a diagram showing a configuration of a construction monitoring system according to another embodiment of the present invention. The configuration described with reference to FIG. 3 is different in that the imaging means 32a and 32b are provided at the construction site and the confirmation means is provided in the specifying means 22c.

  The imaging means 32a and 32b are means for imaging the status of the construction site and outputting image information, and are constituted by a digital camera or the like. In the figure, the entire construction site can be sufficiently imaged by the two imaging means 32a and 32b at the respective viewing angles. As an installation place of the imaging means 32, it is good also as installing in the place which always faces the hanging load position direction, such as the front of the cab 14 of the tower crane 10, besides installing in the construction site. In this embodiment, since the suspended load position is detected, the imaging direction of the imaging unit 32 may be controlled based on the detected suspended load position. In such a form, the imaging range can be expanded and the number of installed imaging means 32 can be reduced.

  The captured image information is used by the confirmation unit 22c to make the identification of the material ID more reliable. For example, the image recognition technique is used by collating the material shape information included in the material attribute data in FIG. 6B and the shape of the building material extracted from the image information. As the material shape data, it is possible to use three-dimensional shape data that can be easily obtained from CAD data used at the time of building design.

  The confirmation method using the image information may be confirmed by an administrator. Various information of the specified building material is displayed together with the image information on the display means, and the administrator is confirmed. Alternatively, when there are a plurality of candidate material IDs in the specifying unit 22c, it is conceivable to display the image information on the display unit in the same manner to allow the administrator to confirm.

  In the present embodiment, the confirmation using the image pickup means 32a and 32b such as a digital camera has been described, but a range sensor may be used instead of the image pickup means 32a and 32b. The range sensor is an optical scanning distance measuring sensor that can irradiate the surrounding with laser light, measure the distance to the surrounding object, and acquire the surrounding object as a three-dimensional shape. While the imaging means 32 can only acquire two-dimensional image information, when a range sensor is used, it is possible to acquire the three-dimensional shape of the building material, so that the material shape included in the material attribute data When collating with information, collation with higher accuracy can be performed.

  As described above, in this embodiment, it is possible to more accurately identify the suspended building material by using the imaging information of the imaging unit 32 and the surrounding information of the range sensor. As a confirmation means, it is conceivable to use a weight sensor of the tower crane 11 in addition to such a form. In this case, the material load ID detected by the weight sensor can be compared with the material attribute data shown in FIG.

  Note that the present invention is not limited to these embodiments, and embodiments configured by appropriately combining the configurations of the respective embodiments also fall within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Tower crane, 11 ... Jib, 12 ... Suspension wire, 13 ... Hook block, 14 ... Driver's cab, 15 ... Tower, 16 ... Turning frame, 20 ... Information processing device, 21 ... Detection means, 22 ... Control means, 22a ... calculating means, 22b ... determining means, 22c ... specifying means, 23 ... storage means, 24 ... display means, 25 ... communication means, 21a to 21c ... GPS sensor, 31 ... building material, 32a, 32b ... imaging means

Claims (11)

In a construction monitoring system at a construction site using a tower crane,
Detection means for detecting the jib position of the tower crane;
Construction data recorded by associating the building material transportation scheduled position with the building material identification information,
Calculating means for calculating the suspended load position based on the jib position detected by the detecting means;
Judgment means for judging that the construction material has been suspended, and for outputting the suspended load end position at the end of the suspension,
A construction monitoring system comprising: a specifying unit that compares the suspended load end position with the construction data and identifies building material identification information in the construction data. The determination means outputs a suspended load end time at the end of the suspended load,
The construction monitoring system according to claim 1, wherein the specifying unit records the specified building material identification information and the suspended load end time in association with each other. The determination means determines that the building material has been suspended and outputs a suspended load start time at the beginning of the suspended load,
The construction monitoring system according to claim 1, wherein the specifying unit records the specified building material identification information and the suspended load start time in association with each other. The construction monitoring system according to any one of claims 1 to 3, wherein the detection means detects an elevation angle and a turning angle of the jib as a jib position. The construction monitoring system according to any one of claims 1 to 4, wherein the detection means is at least one GPS sensor installed in the jib. The construction monitoring system according to any one of claims 1 to 5, wherein the determination unit determines the end of the suspended load on the condition that the jib is stationary for a predetermined time or more. The construction monitoring system according to any one of claims 1 to 6, wherein the determination unit determines the end of the suspended load using a weight sensor that detects the amount of the suspended load. 8. The determination unit according to claim 1, wherein the determination unit determines the end of the suspended load only when the suspended load position is located within a predetermined construction area. Construction monitoring system. The said specific | specification means confirms the suspended construction material based on the weight information detected with the weight sensor which detects the amount of suspension loads, The any one of Claims 1-8 characterized by the above-mentioned. Construction monitoring system. The construction monitoring system according to any one of claims 1 to 9, wherein the specifying unit confirms a suspended building material based on image information captured by the imaging unit. The construction monitoring system according to any one of claims 1 to 10, wherein the specifying unit confirms a suspended building material based on surrounding information measured by a range sensor.

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