Finished form measurement system and finished form measurement method for on-site concrete structure

Abstract

To provide a finished form measurement system and finished form measurement method for on-site concrete structures which can evaluate measured values of finished form measurement in real time without replacing measuring instruments.SOLUTION: A finished form measurement system 1 for on-site concrete structures which measures the finished form of on-site concrete structures (box girder bridge B1) that are built by casting concrete on site includes multiple infrared cameras 2 that are installed at different positions, multiple markers 3 that are attached to particular jigs, a computer 10 that performs calculations according to a particular program, and a memory device 11 that is connected to the computer; the system measures the finished form of the on-site concrete structures (box girder bridge B1) by photographing the markers 3 from different directions with the infrared camera 2 and calculating the three-dimensional position information of each marker 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a system and a method for measuring the completed form of a field-constructed concrete structure. [Background technology]

[0002] For concrete structures constructed on-site, such as overhang construction, the contractor who has exclusive possession of the concrete structure must measure and report the finished form of the concrete structure after construction and hand it over to the owner or other building owner. Until now, measurement of the finished form of such on-site concrete structures has generally been done manually, requiring multiple people to perform the measurement and a series of tasks such as recording and pouring in addition to measuring, making it a very labor-intensive task. Furthermore, there was also the problem that manual measurement could include measurement errors.

[0003] In order to solve such problems, management systems using automatic measuring instruments, etc. have been devised. For example, Patent Document 1 discloses a management support system for buildings or civil engineering structures in which a computer device generates surface data representing the surface of a shape represented by point cloud data, compares combined data in which the point cloud data and the surface data are combined with three-dimensional design data of BIM or CIM, and updates the design data based on the comparison result (see claim 1 in the scope of claims of Patent Document 1, paragraphs

[0013] to

[0033] of the specification, and Figures 1 and 4 of the drawings, etc.).

[0004] However, the building or civil engineering structure management support system described in Patent Document 1 simply updates design data based on current measurement results, and acquires point cloud data, which is a huge amount of data on the surface of the building or civil engineering structure, and then compares it with three-dimensional design data from BIM or CIM, so there is a problem in that it is not possible to reflect the completed form measurements in real time without any time lag and to take corrective action on-site if any defects are found.

[0005] Patent Document 2 discloses a flatness measuring device for a concrete floor slab, which includes a 3D scanner 200, a plane model calculation unit 130 that calculates an average plane that fits the point cloud coordinate data from the point cloud coordinate data of the orthogonal coordinate system (X, Y, Z) acquired by measurement with the 3D scanner 200, and calculates a plane model defined by aX + bY + cZ + d = 0, a distance calculation unit 140 that calculates the distance from the average plane represented by the plane model for each point included in the point cloud coordinate data and positive / negative information on whether the point is on the positive or negative side in the Z direction with respect to the average plane, and a display process 150 that displays the distance and the positive / negative information for each point included in the point cloud coordinate data on a two-dimensional screen in a color corresponding to the distance and the positive / negative information (see claim 1 in the claims of Patent Document 2, paragraphs

[0015] to

[0032] of the specification, and Figures 1 and 6 of the drawings, etc.).

[0006] However, the concrete slab flatness measuring device described in Patent Document 2 simply measures the flatness of the surface during concrete pouring, and does not measure the finished form of a concrete structure, and when applied to finished form measurement, it is thought that the measuring equipment would need to be rearranged, which is a problem that requires time and effort. Furthermore, like the building or civil engineering structure management support system described in Patent Document 1, the concrete slab flatness measuring device described in Patent Document 2 also acquires point cloud data using a 3D scanner, and there is a problem that the analysis load is high due to the huge amount of data, and the measurement value of the finished form measurement cannot be evaluated in real time. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 7125524 [Patent Document 2] JP 2021-131281 A Summary of the Invention [Problem to be solved by the invention]

[0008] Therefore, the present invention has been devised in consideration of the above-mentioned problems, and its object is to provide a system and method for measuring the finished form of on-site concrete structures, which can evaluate the measurement values ​​of the finished form measurement in real time without the need to change the measuring equipment. [Means for solving the problem]

[0009] The system for measuring the completed shape of an on-site concrete structure according to claim 1 is a system for measuring the completed shape of an on-site concrete structure that is constructed by pouring concrete at a construction site, and is characterized in that it comprises a plurality of infrared cameras installed at different positions, a plurality of markers attached to a predetermined jig, a computer that performs calculations according to a predetermined program, and a storage device connected to the computer, and measures the completed shape of the on-site concrete structure by photographing the plurality of markers with the infrared cameras from different directions and calculating three-dimensional position information of each marker.

[0010] The system for measuring the completed form of an on-site constructed concrete structure of claim 2 is characterized in that, in the system for measuring the completed form of an on-site constructed concrete structure of claim 1, the multiple infrared cameras are attached to an object that can move in the construction direction of the on-site constructed concrete structure.

[0011] The system for measuring the completed form of an on-site constructed concrete structure of claim 3 is characterized in that, in the system for measuring the completed form of an on-site constructed concrete structure of claim 2, the multiple infrared cameras are attached to a jig that has casters and can be moved laterally.

[0012] The system for measuring the completed form of an on-site constructed concrete structure according to claim 4 is characterized in that, in the system for measuring the completed form of an on-site constructed concrete structure according to claim 2, the multiple infrared cameras are attached to a mobile work vehicle that runs on rails laid on the upper deck of an existing box girder used in the cantilever erection method.

[0013] The system for measuring the progress of on-site concrete structures according to claim 5 is characterized in that, in the system for measuring the progress of on-site concrete structures according to claim 1 or 2, it further comprises a portable terminal monitor having a display device, and the three-dimensional position information of the marker is converted and displayed on the terminal monitor in a manner that makes it easy to visually grasp the three-dimensional position information.

[0014] The method for measuring the finished shape of a site-constructed concrete structure according to claim 6 is a method for measuring the finished shape of a site-constructed concrete structure which is constructed by pouring concrete at a construction site, and is characterized in that a finished shape measuring system including a plurality of infrared cameras installed at different positions, a plurality of markers attached to a predetermined jig, a computer which performs calculations according to a predetermined program, and a memory device connected to the computer is used to photograph the plurality of markers with the infrared cameras from different directions and calculate three-dimensional position information of each marker to measure the finished shape of the site-constructed concrete structure.

[0015] The method for measuring the completed form of a site-constructed concrete structure of claim 7 is characterized in that, in the method for measuring the completed form of a site-constructed concrete structure of claim 6, a plurality of infrared cameras are attached to an object that can move in the construction direction of the site-constructed concrete structure, and the completed form of the site-constructed concrete structure is measured while moving the plurality of infrared cameras in the construction direction according to the progress of construction work of the site-constructed concrete structure.

[0016] The method for measuring the completed form of an on-site constructed concrete structure of claim 8 is characterized in that, in the method for measuring the completed form of an on-site constructed concrete structure of claim 6 or 7, a portable terminal monitor having a display device is used, and the three-dimensional position information of the marker is converted and displayed on the terminal monitor so that it can be easily visually grasped. Effect of the Invention

[0017] According to the inventions of claims 1 to 8, the position and distance of the markers are calculated using a motion capture technique to measure the finished form, so there is almost no time lag and the finished form of the on-site concrete structure can be accurately measured in real time. This makes it possible to evaluate the finished form measurement of the concrete structure in real time at the construction site and respond to repairs, corrections, modifications, etc. of the concrete structure.

[0018] Furthermore, according to the inventions of claims 1 to 8, instead of collecting huge amounts of point cloud data using a 3D scanner or the like, the finished shape is measured using motion capture techniques, so there is no need to change measuring equipment, and by simply performing simple calibration, the finished shape measurement of the concrete structure can be performed continuously while moving in the construction direction.

[0019] In particular, according to the inventions of claims 2 to 4 and 7, multiple infrared cameras are attached to an object that can move in the construction direction of the concrete structure, so that again there is no need to change the measuring equipment, and by simply performing a simple calibration, it is possible to continuously measure the finished form of the concrete structure while moving in the construction direction.

[0020] In particular, according to the inventions of claims 5 and 8, the three-dimensional position information of each marker is visually grasped and easily converted and displayed on the terminal monitor, so that the finished shape information such as the unevenness of the concrete surface can be visually grasped in real time, and the finished shape measurement can be easily used to correct the finished shape, such as by scraping concrete from the protruding parts into the recessed parts to flatten it out. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a configuration explanatory diagram showing a schematic configuration of a completed shape measurement system for an on-site concrete structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing the position of the infrared camera of the above-mentioned as-built measurement system and its coverage area along the direction perpendicular to the bridge axis. [Diagram 3]FIG. 3 is a perspective view showing the position of an infrared camera of the finished shape measurement system and its coverage area. [Figure 4] FIG. 4 is a perspective view showing a mounting position of an infrared camera of a mobile work vehicle of the above-mentioned completed form measurement system. [Diagram 5] Figure 5 is a photograph of the site taken with the infrared camera attached to the mobile work vehicle facing upward from below. [Figure 6] FIG. 6 is a perspective view showing the mounting position of an infrared camera on a tripod with casters installed inside a box girder of the completed form measurement system. [Figure 7] Figure 7 is a photograph of the site taken along the bridge axis direction of the caster-equipped tripod installed inside the box girder. [Figure 8] FIG. 8 is a photograph showing the probe of the above-mentioned finished shape measurement system. [Figure 9] FIG. 9 is a photograph showing the process of calibrating the installation positions of multiple infrared cameras used in the finished shape measurement system. [Figure 10] FIG. 10 is a photograph showing the process of determining the direction of the coordinates constructed by the above-mentioned finished shape measurement system. [Figure 11] FIG. 11 is a photograph showing the state in which the height of the formwork is being measured by the probe of the above-mentioned finished form measurement system. [Figure 12] Figure 12 is a photograph showing the state in which markers are placed on both ends of a T-shaped trowel in the above-mentioned finished shape measurement system. [Figure 13] FIG. 13 is a photograph showing the state in which a marker is installed on the roller distance measuring device and measurement is performed in the above-mentioned finished shape measurement system. [Figure 14] FIG. 14 is a photograph showing the state in which the finished shape of a chamfered corner is measured using the chamfer offset jig with the above-mentioned finished shape measurement system. [Figure 15] FIG. 15 is a photograph showing the chamfered portion offset jig of the same, where (a) is a plan view and (b) is a bottom view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of a system and method for measuring completed form of an on-site concrete structure according to the present invention will be described in detail with reference to the drawings.

[0023] <Complete form measurement system> First, a system 1 for measuring the completed shape of an on-site concrete structure according to an embodiment of the present invention will be described with reference to Figures 1 to 12. Note that, as an example of the system for measuring the completed shape of an on-site concrete structure according to this embodiment, a case in which the completed shape of a box girder bridge B1 constructed at a construction site by a cantilever erection method will be described.

[0024] As-built measurement system 1 for on-site concrete structures according to an embodiment of the present invention (hereinafter simply referred to as as-built measurement system 1) comprises, as shown in Fig. 1, a number of infrared cameras 2 installed at different positions, a number of markers 3 attached to a predetermined jig such as a probe 6, a computer 10 that performs calculations according to a predetermined program, a storage device 11 that is a database connected to this computer 10, and a terminal monitor 12 that displays the measurement values ​​calculated by the computer 10 in real time. Fig. 1 is an explanatory diagram showing the schematic configuration of the as-built measurement system 1.

[0025] The completed form measurement system 1 is a system that uses an infrared camera 2 to photograph a marker 3 (see Figure 8) attached to a probe 6 or a marker 3 attached to other jigs (see Figures 9, 11, and 12), calculates the position and distance of the marker 3, and continuously tracks and stores the marker 3 in a memory device 11 for tracking, thereby measuring the completed form of a box girder bridge B1, which is a concrete structure.

[0026] (computer) The computer 10 is a calculator equipped with a RAM (Random Access Memory) and performs calculations according to a predetermined program, and calculates the position and distance of the marker 3 using a motion capture technique from images of the marker 3 captured by the infrared camera 2 at multiple different angles. Specifically, infrared rays emitted from the infrared camera 2 hit the marker 3 and are reflected back to the infrared camera 2, which acquires an infrared image of the marker 3, and spatial position information of each marker 3 on the three-dimensional coordinate system is obtained from the images of the marker 3 captured at multiple different angles by the infrared cameras 2.

[0027] (Storage device) The storage device 11 is a memory for permanently storing data, such as a hard disk drive (HDD), a solid state drive (SSD), an optical disk (CD or DVD), a flash memory, etc. The storage device 11 according to this embodiment preferably stores a form format in order to automate form input, and preferably stores three-dimensional design data corresponding to BIM (Building Information Modeling) or CIM (Construction Information Modeling) in the same manner as the management support system for buildings or civil engineering structures described in Patent Document 1 in order to compare three-dimensional data at the time of design with the completed form of the completed concrete structure.

[0028] (Terminal Monitor) The terminal monitor 12 is a portable device such as a smartphone or tablet that is electrically connected to the computer 10 and the storage device 11 wirelessly or via a wired connection and has a monitor (display device) made of a liquid crystal display (LCD) or organic light-emitting diode (OLED) for visually displaying information from the computer 10 and the storage device 11.

[0029] (Infrared camera) In the case of constructing a box girder bridge B1 by the cantilever erection method, as shown in Figs. 2 to 5, the completed form measurement system 1 has multiple infrared cameras 2 installed on a mobile work vehicle 4, which is a Volkswagen that runs on rails laid on the upper deck of the existing box girder of the box girder bridge B1 used in the cantilever erection method and supports scaffolding and the like by suspending them. Note that Fig. 2 is a diagram along the direction Y perpendicular to the bridge axis showing the position of the infrared camera 2 of the completed form measurement system 1 and its coverage area, and Fig. 3 is a perspective view showing the position of the infrared camera 2 of the completed form measurement system 1 and its coverage area. Also, Fig. 4 is a perspective view showing the mounting position of the infrared camera 2 of the mobile work vehicle 4, and Fig. 5 is a site photograph taken with the mounting position of the infrared camera 2 of the mobile work vehicle 4 facing upward from below.

[0030] As shown in the circle in Fig. 5, the infrared camera 2 attached to the mobile work vehicle 4 is installed as far away as possible from the lower flange of the front beam 4a, which is a Volkswagen cross beam that protrudes from the mobile work vehicle 4 in the construction direction X1 of the box girder bridge B1, so that the marker 3 can be captured at different angles. In addition, multiple infrared cameras 2 are also attached to positions further forward of the front beam 4a of the vertical beam 4b, which is a Volkswagen vertical beam. This makes it possible to cover the entire formwork area of ​​the box girder B1a to be constructed next using the cantilever erection method and the constructed concrete structure. Here, the construction direction X1 refers to any direction along the bridge axis direction X in which the box girder B1a is to be added using the cantilever erection method.

[0031] As shown in Figs. 2, 3, 6, and 7, multiple infrared cameras 2 are installed on a tripod with casters 5, which is a jig with casters that can move laterally, in the box girder B1a of the box girder bridge B1. A vertical bar 51 with its longitudinal direction in the vertical direction Z and a horizontal bar 52 with its longitudinal direction in the direction perpendicular to the bridge axis Y are attached to the tripod with casters 5, and infrared cameras 2 are installed at the upper end position of the vertical bar 51 and at both the left and right ends of the horizontal bar 52 (see also Fig. 1). As described above, this is to enable the infrared camera 2 to capture the marker 3 at different angles. Fig. 6 is a perspective view showing the mounting position of the infrared camera 2 on the tripod with casters 5 installed in the box girder B1a, and Fig. 7 is a site photograph taken along the bridge axis direction X of the tripod with casters 5 installed in the box girder B1a.

[0032] As shown in Figures 2 and 3, the finished form measurement system 1 is set up so that the area in which the markers 3 are captured vertically by the infrared camera 2 attached to the mobile work vehicle 4 overlaps with the area in which the markers 3 are captured horizontally by the infrared camera 2 attached to a tripod 5 with casters. Therefore, according to the finished form measurement system 1, the infrared camera 2 capturing the markers 3 vertically and the infrared camera 2 capturing the markers 3 horizontally can be positioned in a coordinated manner, so that measurements can be freely taken using a handheld probe 6 to which multiple markers 3 are attached, as shown in Figure 8. Figure 8 is a photograph showing the probe 6 of the finished form measurement system 1.

[0033] In addition, the infrared camera 2 attached to the mobile work vehicle 4 is attached to the mobile work vehicle 4 running on rails laid on the upper deck of the existing box girder of the box girder bridge B1, and therefore can move sequentially in the construction direction X1 of the box girder bridge B1.

[0034] Similarly, multiple infrared cameras 2 mounted on a tripod 5 with casters can be moved sequentially within the box girder B1a of the box girder bridge B1 in the construction direction X1 of the box girder bridge B1 on the tripod 5 with casters. Therefore, compared to acquiring point cloud data using a 3D scanner or the like as described in the background art, there is no need to rearrange the measuring equipment, and the completed form of the concrete structure can be measured by simply performing a simple calibration.

[0035] (marker) The marker 3 is a small sphere made of an infrared reflective material, and is a component for detecting the position and distance of the marker 3 from the image captured by the infrared camera 2 by reflecting infrared rays.

[0036] In addition, in order to calibrate the positional relationships of the multiple infrared cameras installed, the finished form measurement system 1 moves a calibration jig with three markers attached to the tip of a T-shaped jig within the measurement range as shown in Figure 9, and recognizes the installation positional relationships between the infrared cameras by reading the same markers from the multiple infrared cameras. Figure 9 is a photograph showing how the finished form measurement system 1 calibrates the installation position of the infrared camera 2.

[0037] Furthermore, when constructing coordinates, the finished form measurement system 1 determines the reference three-dimensional coordinate direction with three markers 3 surrounded by a circle as shown in Fig. 9, and determines the three-dimensional coordinate direction with a group of three external markers 60 on the outside of the probe 6 as shown in Fig. 10, and is capable of calculating the three-dimensional coordinate of the tip 62 from the difference in distance between the upper marker group 61 and the tip 62. Fig. 9 is a photograph showing the state in which the coordinate direction is registered in the finished form measurement system 1, and Fig. 10 is a photograph showing the state in which the probe 6 of the finished form measurement system 1 is measuring the height of the form.

[0038] The finished shapes measured by the finished shape measurement system 1 include the form top height and form bottom height when the form is set, the reinforcing bar or prestressing steel bar arrangement pitch or covering of the reinforcing bars or prestressing steel bar when the reinforcement is completed, and the width, height, thickness, and length of the concrete after it is poured. The finished shapes to be measured include the length, width, height, and thickness of the form before concrete is poured, and the leveling height and flatness of the concrete surface when concrete is poured. Other finished shapes to be measured include the flatness of the concrete surface after concrete is poured, and the position, length, width, and cross-sectional measurements of the corners of each part of the concrete structure, such as a wall parapet.

[0039] As described above, the finished form measurement system 1 can measure the position, length, width, etc. of almost all points by using the probe 6. However, it is preferable to measure the leveling height and flatness of the concrete surface when pouring concrete by attaching markers 3 to both ends of a T-shaped trowel 7 used for leveling the concrete floor as shown in FIG. 11 and tracking the markers. This is because, compared to a case where a measurer moves around holding the probe 6 to measure, it is easier to continuously measure the leveling height and flatness of the surface when pouring concrete in real time by simply having a worker hold the trowel 7 and work. FIG. 11 is a photograph showing a state where the finished form measurement system 1 is measuring by attaching markers 3 to both ends of a T-shaped trowel 7.

[0040] Furthermore, as shown in Fig. 12, when measuring the flatness of the concrete surface after concrete is poured, it is preferable to measure by placing a marker 3 on the roller distance measuring device 8 and continuously recording and tracking the positions of the marker. This is because it is possible to continuously measure the flatness of the concrete surface after concrete is poured while measuring distances such as the length and width of each part of the concrete structure after concrete is poured. Fig. 12 is a photograph showing the state in which the marker 3 is placed on the roller distance measuring device 8 and measurement is being performed in the finished form measurement system 1.

[0041] In addition, the edges of concrete structures are often chamfered (the corners are rounded or beveled at an angle of 45° or the like) to prevent chipping. Therefore, when trying to measure the cross-sectional shape of the tip of a component, it is difficult to measure strictly based on the edge of the concrete structure because the chamfer has been rounded. Therefore, it is preferable to measure the thickness and length of the deck slab using a chamfer offset jig 9 that can extend and restore the corners and surfaces, as shown in Figure 14. In addition, as shown in Figure 15, the arm of this chamfer offset jig 9 extends beyond the range where the corners are rounded, and the offset distance is known so that the surface can be extended or the position of the corner can be found by contacting the base body of the concrete structure. There is a recess in the center of this chamfer offset jig 9 (see Figure 15(a)), and when the tip of the probe is placed on the recess, it is corrected by the known, predetermined offset distance of the jig. FIG. 14 is a photograph showing the state in which the finished shape measurement system 1 is using the chamfer offset jig 9 and probe 6 to measure the finished shape of a chamfered corner, and FIG. 15 is a photograph showing the chamfer offset jig 9, where (a) is a plan view and (b) is a bottom view.

[0042] <Finished product measurement method> Next, a method for measuring the completed form of an on-site concrete structure (hereinafter, simply referred to as a completed form measuring method) according to an embodiment of the present invention will be described. A case in which the completed form of a box girder bridge B1 constructed by the cantilever erection method is measured using the completed form measuring system 1 described above will be described as an example.

[0043] (Imaging process) In the finished form measurement method according to this embodiment, first, an imaging step is performed in which infrared light is irradiated from an infrared camera 2 attached to a mobile work vehicle 4 or a tripod 5 with casters, and the reflected light from a marker 3 is captured.

[0044] For example, when measuring the top height of a form when the form is set or when measuring cross-sectional dimensions after concrete is poured, infrared rays are emitted from an infrared camera 2 attached to a mobile work vehicle 4 or a tripod 5 with casters. The emitted infrared rays are then reflected by a marker 3 attached to a probe 6 or the like (see FIG. 10), and an infrared image (including a video; the same applies below) of the marker 3 is taken by the infrared camera 2.

[0045] In addition, when measuring the leveling height of the concrete surface during concrete pouring, infrared rays are emitted by an infrared camera 2 attached to a mobile work vehicle 4 or a tripod 5 with casters, and an image is taken of the light reflected off markers 3 attached to both ends of a T-shaped trowel 7, as shown in Figure 11.

[0046] When measuring the flatness of the concrete surface after pouring, infrared light is emitted by the infrared camera 2 and an image is taken of the light reflected off the marker 3 attached to the roller distance measuring device 8, as shown in FIG. 12.

[0047] In addition, when the construction work of the box girder bridge B1, which is a field-constructed concrete structure, progresses and a new box girder B1a is constructed in the construction direction X1, the mobile work vehicle 4 is moved along the rails in the construction direction X1, and the tripod 5 with casters is moved in the construction direction X1 inside the existing box girder B1a where the concrete has already hardened, and infrared rays are irradiated by the infrared camera 2 to take images. In other words, images are taken while moving the multiple infrared cameras 2 in the construction direction X1 according to the progress of the construction work of the box girder bridge B1, and the completed form is continuously measured. In this way, with the completed form measurement system 1, it is possible to continuously measure the completed form of the box girder bridge B1 while moving in the construction direction X1 by simply performing a simple calibration before the position information calculation process described later.

[0048] (Location information calculation process) Next, in the finished shape measurement method of this embodiment, a position information calculation process is performed in which the computer 10 calculates spatial position information (three-dimensional position information) of the marker 3 in three-dimensional coordinates from infrared images of the marker 3 taken at different angles by infrared cameras 2 at multiple locations.

[0049] Specifically, the infrared image of the marker 3 is binarized based on the difference in brightness of the pixels, and the two-dimensional distance from the infrared camera 2 that captured the image to the mathematical center of gravity of the bright white part is calculated. Then, the two-dimensional distances from the infrared camera 2 to each of the multiple markers 3 at different angles are combined to calculate the three-dimensional coordinates of each of the markers.

[0050] For example, as shown in Figure 10, when calculating the position information of a marker 3 attached to a probe 6, the three-dimensional coordinate direction is determined by a group of three external markers 60 on the outside of the probe 6, and the three-dimensional coordinate of the tip 62 is calculated from the difference in distance between the upper marker group 61 and the tip 62.

[0051] (Tracking process) Next, in the finished shape measuring method according to this embodiment, a tracking step is performed in which the position information of the three-dimensional coordinates of the marker 3 calculated by the computer 10 in the previous position information calculation step is continuously tracked and recorded in the storage device 11.

[0052] (Display process) Next, in the finished shape measurement method of this embodiment, a display process is performed to display on the terminal monitor 12 the three-dimensional coordinate position information of the marker 3 calculated in the previous position information calculation process and the three-dimensional coordinate position information of the marker 3 recorded in the memory device 11 in the previous tracking process.

[0053] Specifically, the three-dimensional position information of each marker 3 is converted and displayed on the monitor of the terminal monitor 12 so that it can be easily grasped visually. For example, when measuring the leveling height of the concrete surface during concrete pouring, the unevenness of the poured concrete is displayed in different colors. Another possible display method is to enlarge and display a vertical cross-sectional view of the concrete surface with the unevenness emphasized. By converting and displaying the three-dimensional position information of the markers 3 in such a way that it can be easily grasped visually, the position information such as unevenness can be visually grasped in real time, and the finished shape measurement can be used to correct the finished shape, such as by scraping concrete from the protruding parts into the recessed parts to flatten it.

[0054] Although the measurements are taken in real time, the timing of the recording must be at the discretion of the person taking the measurements. To solve this problem, a wireless button switch can be used to allow the person taking the measurements to decide the timing of the measurements. It is also possible to decide the timing of the measurements on the PC side, and measurements can be taken continuously.

[0055] According to the above-described system 1 and method for measuring the completed form of an on-site concrete structure according to the present embodiment, the position and distance of the markers are calculated using a motion capture technique to measure the completed form, so there is almost no time lag and the completed form of the on-site concrete structure can be accurately measured in real time. This makes it possible to evaluate the completed form measurement of the concrete structure in real time at the construction site and respond to repairs, corrections, modifications, etc. of the concrete structure.

[0056] Furthermore, according to the completed form measurement system 1 and completed form measurement method of this embodiment, instead of collecting huge amounts of point cloud data using a 3D scanner or the like, the completed form is measured using motion capture techniques, so there is no need to change the measuring equipment, and by simply performing simple calibration, the completed form measurement of the concrete structure can be performed continuously while moving in the construction direction.

[0057] Furthermore, according to the finished form measurement system 1 and finished form measurement method of this embodiment, multiple infrared cameras 2 are attached to objects such as a mobile work vehicle 4 or a tripod with casters 5 that can move in the construction direction X1 of the concrete structure (box girder bridge B1), so in this respect too, there is no need to rearrange the measuring equipment, and by simply performing a simple calibration, finished form measurement of the concrete structure can be performed continuously while moving in the construction direction X1.

[0058] In addition, according to the finished form measurement system 1 and finished form measurement method of this embodiment, the three-dimensional position information of each marker 3 is visually grasped and easily converted and displayed on the terminal monitor 12, so that finished form information such as unevenness of the concrete surface can be visually grasped in real time, and finished form measurement can be easily used to correct the finished form, such as scraping concrete from protruding parts into recesses to flatten it out.

[0059] <Effect verification> Next, the results of a comparison between conventional measurements conducted to confirm the effects of the present invention and the completed form measurement using the completed form measurement system 1 described above are shown in Table 1 below. Here, the conventional measurements are measurements made manually using a scale such as a convex, as in the past, and the values ​​measured by infrared rays using the completed form measurement system 1 described above. The upper and lower decks at the measurement points refer to the upper and lower decks of the box girder bridge B1 described above. The difference refers to the difference between the measurement value obtained by the conventional measurement and the measurement value obtained by the completed form measurement system 1. The standard value refers to the standard for the error allowed at that measurement point.

[0060] [Table 1]

[0061] As is clear from Table 1, the difference with manual measurements is less than 3 mm, and the standard values ​​for the two measurement points where the difference is 3 mm are both in the range of -24 mm to +24 mm, meaning that the measurements made by the finished form measurement system 1 are almost as accurate as manual measurements. In fact, it is estimated that the measurements are more accurate than manual measurements, which can become tiring when there are many measurement points. Furthermore, when considering inputting these measurements into a form and submitting them to the client, it goes without saying that work efficiency is improved, as the conventional method does not require the usual handwriting on paper and typing into a PC.

[0062] The above is a detailed description of the method for measuring the finished shape of an on-site concrete structure according to an embodiment of the present invention. However, the above-mentioned and illustrated embodiments are merely specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted as being limited by these.

[0063] In particular, the example described above uses the measurement of the finished shape of a box girder bridge B1 constructed at a construction site using the cantilever erection method. However, it goes without saying that the object of the finished shape measurement is not limited to box girder bridges, and can also be applied to other concrete structures constructed at the site. [Explanation of symbols]

[0064] 1: As-built measurement system 2: Infrared camera 3: Marker 4: Mobile worker 4a: Front beam 4b: Stringer 5: Tripod with casters 51: Vertical bar 52: Horizontal bar 6: Probe 60: External markers 61: Upper marker group 62:Tip 7: Trowel dragonfly 8: Roller distance measuring device 9: Chamfer offset jig 10: Computer 11:Storage device 12: Terminal monitor B1: Box girder bridge (on-site constructed concrete structure) B1a: Box girder

Claims

1. A system for measuring the completed shape of an on-site concrete structure that measures the completed shape of an on-site concrete structure that is constructed by pouring concrete at a construction site, The system comprises a plurality of infrared cameras installed at different positions, a plurality of markers attached to a predetermined jig, a computer that performs calculations according to a predetermined program, and a storage device connected to the computer; The infrared camera photographs the plurality of markers from different directions, and calculates three-dimensional position information of each marker to measure the completed shape of the on-site concrete structure. This is a system for measuring the completed shape of on-site concrete structures.

2. The plurality of infrared cameras are attached to an object that is movable in a construction direction of the in-situ concrete structure.

2. The system for measuring the completed shape of a field-constructed concrete structure according to claim 1 .

3. The plurality of infrared cameras are attached to a jig having casters that can be moved laterally.

3. The system for measuring the completed shape of a field-constructed concrete structure according to claim 2.

4. The multiple infrared cameras are attached to a mobile work vehicle that runs on rails laid on the upper deck of an existing box girder used in the cantilever erection method.

3. The system for measuring the completed shape of a field-constructed concrete structure according to claim 2.

5. The present invention further includes a portable terminal monitor having a display device, and the terminal monitor converts and displays the three-dimensional position information of the marker in a manner that is easy to visually grasp.

3. The system for measuring the completed shape of a field-constructed concrete structure according to claim 1 or 2.

6. A method for measuring the finished shape of an on-site concrete structure that measures the finished shape of an on-site concrete structure that is constructed by pouring concrete at a construction site, comprising: Using a finished product measurement system equipped with multiple infrared cameras installed at different positions, multiple markers attached to a specified jig, a computer that performs calculations according to a specified program, and a storage device connected to this computer, The infrared camera photographs the plurality of markers from different directions, and calculates three-dimensional position information of each marker to measure the completed shape of the on-site concrete structure. A method for measuring the completed form of a site-constructed concrete structure, comprising:

7. A plurality of infrared cameras are attached to an object that can move in a construction direction of the on-site concrete structure, and the completed shape of the on-site concrete structure is measured while moving the plurality of infrared cameras in the construction direction according to the progress of the construction work of the on-site concrete structure.

7. The method for measuring the completed form of a field-constructed concrete structure according to claim 6.

8. Using a portable terminal monitor having a display device, the three-dimensional position information of the marker is converted and displayed on the terminal monitor so that it can be easily grasped visually.

8. The method for measuring the completed form of a field-constructed concrete structure according to claim 6 or 7.

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