Bridge renewal method and support system

Abstract

To provide a renewal method capable of shortening the construction period for bridge renewal work, and a support system.SOLUTION: A support system 10 is a system for supporting the renewal of a bridge with multiple decks placed side by side in the bridge axis direction. The support system 10 acquires a piece of road point cloud data of existing bridges captured from above the existing bridge and a piece of existing bridge underpass point cloud data captured from under the existing bridge and creates a 3D model of the existing bridge by combining the road point cloud data and underpass cloud point data. The support system 10 cuts the existing deck by performing cutting simulation based on the 3D model and cutting rules, and creates cutting data showing the cut floor decks.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bridge renewal method and support system. [Background technology]

[0002] Renewal work is currently being carried out to renew an existing bridge. In this renewal work, for example, as in Patent Document 1, deck slabs arranged side by side in the bridge axis direction are replaced. Specifically, scaffolding is first erected around the bridge, and the bridge is surveyed using the scaffolding. Then, based on the survey results and the as-built drawings created during construction, the differences between the current bridge and the as-built drawings are identified. Next, a designer designs the new deck slab by allocating the new slab to be actually installed based on the as-built drawings, the differences between the current bridge and the as-built drawings, and the allocation rules. The new deck slab is fabricated based on the designer's design and then transported to the construction site. At the construction site, the existing deck slab is removed to expose the existing girders, and the new deck slab is then installed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-085172 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned renovation work is carried out under traffic restrictions, such as road closures on expressways, which can lead to traffic congestion and congestion on roads around the construction site. For this reason, there is a need to shorten the construction period for bridge renovation work, including the period of traffic restrictions. [Means for solving the problem]

[0005] A bridge renewal method that solves the above problem is a bridge renewal method for renovating a bridge with multiple decks arranged side by side in the bridge axis direction, in which a support system that supports the bridge renewal performs cut-cutting of the existing deck using a cut-cutting simulation based on a 3D model of the existing bridge and cut-cutting rules, and creates cut-cutting data that shows the cut-cut deck. [Effects of the Invention]

[0006] According to the present invention, the construction period for bridge renewal work can be shortened. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a flowchart showing the flow of an embodiment of a bridge renewal method. [Figure 2] FIG. 1 is a diagram illustrating a schematic configuration of an embodiment of a support system. [Figure 3] FIG. 2 is a diagram illustrating an example of a hardware configuration of an information processing device. [Figure 4] 1 is a flowchart showing the flow of a design preparation process. [Figure 5] FIG. 1 is a diagram illustrating an example of a method for acquiring road point cloud data. [Figure 6] FIG. 10 is a diagram illustrating an example of a method for acquiring under-road point cloud data. [Figure 7] 1 is a flowchart showing the flow of a design process. [Figure 8] 1 is a flowchart showing the flow of the existing deck design process. [Figure 9] FIG. 2 is a diagram schematically illustrating a 3D model based on cut data. [Figure 10] FIG. 10 is a diagram schematically illustrating an example of the formation positions of jack-up holes set in a cut-partition deck. [Figure 11] FIG. 10 is a diagram showing an example of the formation position of a suspension hole in a cut-split deck. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of a bridge renewal method and a support system therefor will be described with reference to Figures 1 to 11. Note that in this embodiment, a case where an existing deck slab is replaced in renewal construction will be described.

[0009] As shown in Figure 1, renewal work to replace the existing deck of an existing bridge involves a design preparation process (step S101), a design process (step S102), a deck production process (step S103), a construction preparation process (step S104), and a construction process (step S105).

[0010] The design preparation process (step S101) is a process in which 3D model data that reproduces the existing bridge 50 is created as preparations required for various designs. The design process (step S102) is a process in which new deck slab design data, which is data related to the new deck slab, and existing deck slab design data, which is data related to the removal of the existing deck slab, are created. The deck slab production process (step S103) is a process in which the new deck slab is produced based on the new deck slab design data. The construction preparation process (step S104) is a process in which preparations are made for the removal of the existing deck slab and the installation of the new deck slab based on the new deck slab design data and the existing deck slab design data. The construction process (step S105) is a process in which the existing deck slab is removed and the new deck slab is installed.

[0011] As shown in FIG. 2, a support system 10 that supports renewal work includes a design support system 20, a production support system 30, and a construction support system 40. The design support system 20 is a system used by designers who design renewal work. The design support system 20 includes a design support device 21. The production support system 30 is a system used by producers who produce replacement objects such as deck slabs. The production support system 30 includes the production support device 31. The construction support system 40 is a system used by contractors who carry out renewal work. The construction support system 40 includes the construction support device 41. These support devices (21, 31, 41) are configured to be able to communicate with each other via the server 100. In other words, each support device (21, 31, 41) is configured to be able to share information uploaded to the server 100.

[0012] As shown in FIG. 3, each of the support devices (21, 31, 41) is configured around an information processing device H10. The information processing device H10 includes a communication device H11, an input device H12, a display device H13, a storage device H14, and a processor H15. Note that this hardware configuration is an example, and the information processing device H10 may include other hardware.

[0013] The communication device H11 is an interface that establishes a communication path with other devices and transmits and receives data. The input device H12 is a device that receives input from an operator, such as a mouse or keyboard. The display device H13 is a display or touch panel that displays various information. The storage device H14 is a storage unit that stores data and various programs for executing various functions. Examples of the storage device H14 include a ROM, a RAM, a hard disk, etc.

[0014] The processor H15 controls each process in each support device using programs and data stored in the storage device H14. Examples of the processor H15 include a CPU and an MPU. The processor H15 loads programs stored in a ROM or the like into a RAM and executes various processes corresponding to the various processes. For example, when a specific application program is launched, the processor H15 runs a process that executes each process according to the program.

[0015] The processor H15 is not limited to a processor that performs all of its processing using software. For example, the processor H15 may include a dedicated hardware circuit (e.g., an application-specific integrated circuit (ASIC)) that performs hardware processing for at least some of the processing it performs. That is, the processor H15 may be configured as follows:

[0016] (1) One or more processors operating according to a computer program (software) (2) One or more dedicated hardware circuits that perform at least some of the processes; or (3) Circuits including combinations thereof The processor H15 includes a CPU and memory, such as RAM and ROM, that stores program code or instructions configured to cause the CPU to perform processes. Memory, i.e., computer-readable media, includes any available media that can be accessed by a general-purpose or special-purpose computer.

[0017] (Design preparation process) The design preparation process (step S101) is carried out using the design support system 20. In the design preparation process, an existing bridge is photographed to obtain point cloud data, and CIM data for the existing bridge is created based on the point cloud data. The point cloud data for the existing bridge is composed of on-road point cloud data photographed from above and under-road point cloud data photographed from below. At each point on the existing bridge, a control point is provided that serves as a reference when combining the on-road point cloud data and the under-road point cloud data.

[0018] As shown in FIG. 4, the design preparation process includes a road point cloud data acquisition process (step S201), an under-road point cloud data acquisition process (step S202), and a model creation process (step S203).

[0019] As shown in FIG. 5, in the road point cloud data acquisition process (step S201), road point cloud data is acquired using a road camera 23 mounted on an unmanned aerial vehicle 22 whose flight area is the periphery of an existing bridge 50.

[0020] The right side of the existing bridge 50 is imaged using an unmanned aerial vehicle 22 flying on the right side of the existing bridge 50. The left side of the existing bridge 50 is imaged using an unmanned aerial vehicle 22 flying on the left side of the existing bridge 50. It is preferable that the road camera 23 images from a 45-degree angle and a 60-degree angle relative to a predetermined reference point of the existing bridge 50 so that traffic will not be obstructed even if the unmanned aerial vehicle 22 falls. The road camera 23 acquires road point cloud data by imaging the existing bridge 50 from above while flying the unmanned aerial vehicle 22 above the existing bridge 50. The road point cloud data is input to the design support device 21 by connecting the road camera 23 to the design support device 21.

[0021] As shown in FIG. 6 , in the under-road point cloud data acquisition process (step S202), under-road point cloud data is acquired by an under-road camera 26 mounted on a mobile robot 25 moving along an existing girder 51. The mobile robot 25 is supported on the lower flanges 52 of a pair of adjacent existing girders 51 perpendicular to the bridge axis and is configured to be movable in the bridge axis direction. The mobile robot 25 has a moving machine 27 and an erection member 28. The moving machine 27 moves on the lower flanges 52 of each existing girder 51 in the bridge axis direction by rolling on the lower flanges 52 of each existing girder 51 with rollers 29 arranged to sandwich the webs 53. The erection member 28 connects the lower end of the moving machine 27 below the existing girder 51. The under-road camera 26 is mounted on the erection member 28 so as to be positioned in the center of the pair of moving machines 27. The under-road camera 26 captures images of the under-road area of the existing bridge 50 while moving by the mobile robot 25 in the bridge axis direction, thereby acquiring under-road point cloud data within the imaging range. The under-road point cloud data is input to the design support device 21 by connecting the under-road camera 26 to the design support device 21. By capturing images of the under-road in this manner for the entire existing bridge 50, under-road point cloud data for the entire existing bridge 50 is obtained.

[0022] In the model creation step (step S203), a model generation process is executed in the design support device 21. In the model generation process, the design support device 21 synthesizes the on-road point cloud data and the under-road point cloud data based on the orientation points included in each data, and creates CIM (Construction Information Modeling) data, which is 3D model data that reproduces the existing bridge 50.

[0023] In this way, by acquiring the on-road point cloud data and under-road point cloud data from which CIM data of the existing bridge 50 can be created using the above-mentioned method, it is possible to survey the existing bridge 50 without restricting the roads leading to the existing bridge 50. The on-road point cloud data acquisition process (step S201) and the under-road point cloud data acquisition process (step S202) may be performed in parallel, or the under-road point cloud data acquisition process (step S202) may be performed first.

[0024] (design process) The design process (step S102) is carried out using the design support system 20. As shown in FIG. 7, in the design process, a new deck design process (step S301) and an existing deck design process (step S302) are carried out based on CIM data.

[0025] (New floor slab design process) In the new deck design process (step S301), the designer operates the design support device 21 to input various information related to the new deck. Specifically, the designer inputs basic design items for the new deck, such as the layout rules for the new deck, the overall area where the new deck will be installed, the materials to be used, and the placement of rebar. The designer also inputs the fixed positions of splice plates and non-placement areas of the joints of the new deck. Then, based on the various information above, the design support device 21 executes the layout process for the new deck. By executing the layout process, the design support device 21 creates new deck design data that indicates the shape and installation position of each new deck. The new deck design data is uploaded to the server 100 and shared among the designer, manufacturer, and contractor. Based on the new deck design data uploaded to server 100, the manufacturer produces the new deck in the deck production process (step S103), and the contractor prepares for and constructs the installation of the new deck in the construction preparation process (step S104) and construction process (step S105).

[0026] (Existing floor slab design process) In the existing deck design process (step S302), a design for removing the existing deck is performed. The existing deck is cut into a size that can be transported, and then jacked up to separate it from the existing girder 51. It is then lifted and transported using a crane or the like to remove it.

[0027] In the removal design process, the design support device 21 designs not only the cutting of the existing deck, but also the positions of the jack-up holes to be used when jacking up, and the positions of the suspension holes through which the wires to be used when lifting are passed.

[0028] As shown in FIG. 8, the existing deck design process includes a cutting and division rule setting process (step S401), a cutting and division simulation (step S402), a position condition input process (step S403), and a positioning simulation (step S404).

[0029] In the cutting rule setting process (step S401), the designer operates the design support device 21 to input the cutting rules to be used when cutting the existing deck slab. Specifically, the designer inputs basic design items such as the installation range of the existing deck slab, the materials to be used, and the cutting dimension range of the existing deck slab as the cutting rules. The designer also inputs the cutting line conditions as the cutting rules. The cutting line conditions are conditions to prevent interference between the cutting device and accessories such as splice plates and catch basins installed on the existing bridge when cutting the existing deck slab.

[0030] The cutting and division simulation (step S402) is started when the designer performs a cutting and division start operation on the design support device 21 after inputting the cutting and division conditions. In the cutting and division simulation, the design support device 21 performs cutting and division of the existing deck slab based on the CIM data and the cutting and division rules. As a result of the cutting and division simulation, the design support device 21 creates cutting and division data including the coordinates of the cut lines of the existing deck slab. In this cutting and division data, the size of the existing deck slab cut along cut lines that do not interfere with accessories is adjusted so that it falls within the above-mentioned cutting and division dimension range.

[0031] As shown in Figure 9, the cut-off data is 3D model data that can display a cut-off deck 60, which is an existing deck that has been cut off along a cut line 59, including existing girders 51a, 51b, 51c, and 51d, counter-tilt structures 55, splice plates 56, drainage pits 58, etc.

[0032] In the position condition input process (step S403), the designer inputs conditions related to the formation positions of the jack-up holes and suspension holes into the design support device 21. In the position condition input process, the designer inputs, as position conditions for the jack-up holes, the distance dimension range from the cut line 59, the support girder which is the existing girder that supports the jack, the diameter of the jack-up holes, the pitch range of the jack-up holes in the bridge axis direction and the direction perpendicular to the bridge axis, etc. Furthermore, as position conditions for the suspension holes, the designer inputs, as well as the distance dimension from the cut line 59, the diameter and number of suspension holes to be formed, etc.

[0033] After inputting the positioning conditions, the positioning simulation (step S404) is started when the designer performs a positioning start operation on the design support device 21. In the positioning simulation, the design support device 21 sets the coordinates of the formation positions of the jack-up holes and suspension holes in each cut-partition floor slab 60.

[0034] Specifically, the design support device 21 performs a simulation regarding the formation positions of jack-up holes based on the cut-out data and position conditions. In this simulation, the design support device 21 sets jack-up holes for each cut-out floor slab 60 at positions where the jack device will not interfere with the counter-tilt structure 55, splice plate 56, drainage pit 58, etc.

[0035] Fig. 10 is a diagram showing an example of the formation positions of jack-up holes 61 set in a cut-partition deck 60. Fig. 10 shows the formation positions of jack-up holes 61 when a predetermined separation range is set as the position condition and support girders are 51a and 51b.

[0036] In the positioning simulation, the design support device 21 performs a simulation regarding the formation positions of the suspension holes based on the cutting data and position conditions. In this simulation, the design support device 21 calculates the position of the center of gravity of each cutting floor slab 60. Then, for each cutting floor slab 60, based on the position of the center of gravity and the position conditions, the design support device 21 sets the formation positions of the suspension holes at positions where the center positions of the multiple suspension holes in a top view overlap the position of the center of gravity of the cutting floor slab 60 and where the lifting suspension devices do not interfere with the counter tilt structure 55, splice plate 56, catch basin 58, etc.

[0037] Fig. 11 is a diagram showing a schematic example of the formation positions of the suspension holes 62 in the cut-split deck 60. Fig. 11 shows an example of the formation positions of the suspension holes 62 when a predetermined distance range is set as the position condition and the number of holes is set to four.

[0038] Once the formation positions of the jack-up holes 61 and the suspension holes 62 have been set in this manner, the design support device 21 creates existing deck design data that indicates the formation positions of the jack-up holes 61 and the suspension holes 62 in each cut-partition deck 60 for the cut-partition data. The existing deck design data is uploaded to the server 100 and shared among the designer, manufacturer, and contractor. Based on the existing deck design data uploaded to the server 100, construction preparations and construction work for removal of the existing deck by the contractor are carried out in the construction preparation process (step S104) and construction process (step S105).

[0039] The operation and effects of this embodiment will be described. (1) According to the above embodiment, cutting of the existing deck slab is performed based on the 3D model of the existing bridge 50 and the cutting rules, and cutting data indicating the cutting of the existing deck slab 60 is created. This reduces the time required to design the cut line 59 of the existing deck slab and allows the existing deck slab to be cut smoothly at the construction site. As a result, the construction period for the renewal work can be shortened.

[0040] (2) According to the above embodiment, CIM data capable of reproducing the existing bridge 50 is created based on the road point cloud data acquired using the unmanned aerial vehicle 22 and the under-road point cloud data acquired using the mobile robot 25. This allows the existing bridge 50 to be surveyed without restricting the roads leading to the existing bridge 50, thereby shortening the construction period for the renewal work.

[0041] (3) According to the above embodiment, the formation positions of the jack-up holes 61 in each cut-and-cut floor slab 60 are designed by simulation based on the cut-and-cut data and the positional conditions of the jack-up holes 61. This allows, for example, smooth construction of the jack-up holes 61 in the construction process (step S105), thereby shortening the construction period of the renewal work.

[0042] (4) According to the above embodiment, the formation positions of the suspension holes 62 in each cut-partition deck 60 are designed by simulation based on the cut-partition data and the positional conditions of the suspension holes 62. This allows, for example, the suspension holes 62 to be smoothly formed during the construction process, thereby shortening the construction period for renewal work. Furthermore, since the suspension holes 62 are formed so that their centers coincide with the center of gravity of the cut-partition deck 60, the cut-partition deck 60 can be lifted safely.

[0043] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, a construction simulation for removing the existing deck slab may be performed. This construction simulation visualizes the construction procedure of the renewal work in a 3D model by adding a time axis to the 3D model.

[0044] Various processes related to the construction simulation are performed by the server 100. The construction simulation is performed based on construction procedure rules registered by the designer. The construction procedure rules are rules related to the construction cycle. The construction procedure rules define the number of cut-partitioned slabs 60 to be removed in one cycle, the removal work period, the number of new slabs to be installed, the installation work period, the start date and time, and the start direction, with one cycle consisting of the removal of a cut-partitioned slab 60 and the installation of a new slab. In the construction simulation, the server 100 displays or hides 3D models of the cut-partitioned slab 60, the new slab, etc., based on the CIM data, existing slab design data, new slab design data, and the construction procedure rules.

[0045] In the above embodiment, the formation positions of the jack-up holes 61 and the suspension holes 62 in each cut-partition floor slab 60 are set by a positioning simulation. However, the formation positions of the jack-up holes 61 and the suspension holes 62 may be determined by the contractor at the construction site.

[0046] In the above embodiment, the road point cloud data was acquired using the road imaging device 23 mounted on the unmanned aerial vehicle 22. However, the present invention is not limited to this, and the road point cloud data may be acquired, for example, using an imaging device that is installed near the existing bridge 50 and is capable of capturing images of the road surface of the existing bridge 50. Furthermore, the road point cloud data may be acquired using a laser measuring device mounted on the unmanned aerial vehicle 22, or may be acquired using a laser measuring device installed near the existing bridge 50. Furthermore, the road point cloud data may be acquired based on the imaging results from the imaging device and the measurement results from the laser measuring device.

[0047] In the above embodiment, the under-road point cloud data was acquired using the under-road camera 26 mounted on the mobile robot 25. However, the under-road point cloud data may also be acquired using, for example, an imager mounted on an unmanned aerial vehicle. The under-road point cloud data may also be acquired using a laser measuring instrument mounted on an unmanned aerial vehicle, or may be acquired using a laser measuring instrument installed near the existing bridge 50. Furthermore, the under-road point cloud data may also be acquired based on the imaging results from the imager and the measurement results from the laser measuring instrument. [Explanation of symbols]

[0048] 10...support system, 20...design support system, 21...design support device, 22...unmanned aerial vehicle, 23...road camera, 25...mobile robot, 26...underroad camera, 27...mobile device, 28...construction member, 29...roller, 30...manufacturing support system, 31...manufacturing support device, 32...camera, 33...measuring instrument, 40...construction support system, 41...construction support device, 42...camera, 50...existing bridge, 51...existing girder, 52...bottom flange, 53...web, 55...counter-tilt structure, 56...splicing plate, 58...drainage pit, 60...cut-split deck slab, 61...jack-up hole, 62...suspension hole, 100...server.

Claims

1. A bridge renewal method for renewing a bridge in which multiple decks are arranged side by side in the bridge axis direction, comprising: The support system for supporting the renewal of the bridge comprises: Acquire road point cloud data of an existing bridge and under-road point cloud data of the existing bridge, synthesize the road point cloud data and the under-road point cloud data to create a 3D model of the existing bridge; Identifying the arrangement of accessories on the existing bridge through a cut-and-cut simulation based on the 3D model and cut-and-cut rules; The existing floor slab is cut and divided in accordance with the arrangement of the specified attachments, and cut and division data indicating the cut and division floor slab is created. Bridge renewal methods.

2. The support system designs the formation positions of the jack-up holes in each cut-out floor slab based on the cut-out data and the position conditions of the jack-up holes. The bridge renewal method according to claim 1.

3. The support system designs the formation positions of the suspension holes in each cut-out floor slab based on the cut-out data and the position conditions of the suspension holes. The bridge renewal method according to claim 1.

4. A support system that supports the renewal of a bridge in which multiple decks are installed side by side in the bridge axis direction, Acquire road point cloud data of an existing bridge and under-road point cloud data of the existing bridge, synthesize the road point cloud data and the under-road point cloud data to create a 3D model of the existing bridge; Identifying the arrangement of accessories on the existing bridge through a cut-and-cut simulation based on the 3D model and cut-and-cut rules; The existing floor slab is cut and divided in accordance with the arrangement of the specified attachments, and cut and division data indicating the cut and division floor slab is created. Support system.

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