JP7725010B2 - Bridge renewal method and support system - Google Patents

Description

The present invention relates to a bridge renewal method and support system.

Renovation work is currently being carried out to renovate existing bridges. In this 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 scaffolding is used to survey the bridge. Differences between the current bridge and the as-built drawings are then identified based on the survey results and the as-built drawings created during construction. Next, a designer designs the new deck slab by allocating the new slab to be 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.

Japanese Patent Application Laid-Open No. 2021-085172

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.

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 division of the existing deck using a cut division simulation based on a 3D model of the existing bridge and cut division rules, and creates cut division data that indicates the cut division of the cut deck.

This invention can shorten the construction period for bridge renovation work.

1 is a flowchart showing the flow of an embodiment of a bridge renewal method. FIG. 1 is a diagram illustrating a schematic configuration of an embodiment of a support system. FIG. 2 is a diagram illustrating an example of a hardware configuration of an information processing device. 1 is a flowchart showing the flow of a design preparation process. FIG. 1 is a diagram illustrating an example of a method for acquiring road point cloud data. FIG. 10 is a diagram illustrating an example of a method for acquiring under-road point cloud data. 1 is a flowchart showing the flow of a design process. 1 is a flowchart showing the flow of the existing deck design process. FIG. 10 is a diagram schematically illustrating a 3D model based on cut data. FIG. 10 is a diagram illustrating an example of the formation positions of jack-up holes set in a cut-partition deck. FIG. 10 is a diagram showing an example of the formation position of a suspension hole in a cut-split deck.

One embodiment of a bridge renewal method and its support system will be described with reference to Figures 1 to 11. Note that this embodiment describes the replacement of an existing deck slab during renewal work.

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).

The design preparation process (step S101) is a process in which 3D model data reproducing 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.

As shown in FIG. 2, the support system 10 for supporting renewal work comprises 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 comprises a design support device 21. The production support system 30 is a system used by manufacturers who produce replacement items such as deck slabs. The production support system 30 comprises a 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 comprises a 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.

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.

The communication device H11 is an interface that establishes a communication path with other devices and sends and receives data. The input device H12 is a device that accepts 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 memory unit that stores data and various programs for executing various functions. Examples of the storage device H14 include ROM, RAM, and a hard disk.

The processor H15 controls each process in each support device using the 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 ROM, etc., into 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 that program.

Processor H15 is not limited to performing all of the processing it performs using software. For example, processor H15 may be equipped with 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. In other words, processor H15 may be configured as follows:

Circuitry that includes: (1) one or more processors that operate according to a computer program (software); (2) one or more dedicated hardware circuits that perform at least some of the various processes; or (3) a combination 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.

(Design preparation process)
The design preparation process (step S101) is carried out using the design support system 20. In this 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. Control points are provided at various points on the existing bridge to serve as reference points when combining the on-road point cloud data and under-road point cloud data.

As shown in Figure 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).

As shown in Figure 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 the existing bridge 50.

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. The road camera 23 preferably images from a 45-degree and a 60-degree angle relative to a predetermined reference point on the existing bridge 50 so that traffic will not be obstructed if the unmanned aerial vehicle 22 falls. The road camera 23 acquires road point cloud data by capturing images of 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 into the design support device 21 by connecting the road camera 23 to the design support device 21.

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 the existing girders 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 in the bridge axis direction on the lower flanges 52 of each existing girder 51 by rolling rollers 29 arranged to sandwich the webs 53 on the lower flanges 52. The erection member 28 connects the lower end of the moving machine 27 below the existing girders 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 in the bridge axis direction using the mobile robot 25, thereby acquiring under-road point cloud data for the imaging range. The under-road point cloud data is input into 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.

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

In this way, by acquiring road point cloud data and under-road point cloud data that can be used to create CIM data for the existing bridge 50 using the method described above, it is possible to survey the existing bridge 50 without restricting the roads leading to the existing bridge 50. The 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.

(design process)
The design process (step S102) is performed 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.

(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 details 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 the splice plates and the 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 indicating 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).

(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 transportable size 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.

During the removal design process, the design support device 21 designs the cuts to be made in the existing deck, as well as the locations of the jack-up holes to be used when jacking up, and the locations of the suspension holes through which the wires used when lifting are passed.

As shown in Figure 8, the existing deck design process involves 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).

In the cutting rule setting process (step S401), the designer operates the design support device 21 to input cutting rules for cutting the existing deck slab. Specifically, the designer inputs basic design details such as the installation area of the existing deck slab, the materials used, and the cutting dimension range of the existing deck slab as cutting rules. The designer also inputs cutting line conditions as cutting rules. The cutting line conditions are conditions for preventing interference between the cutting device and accessories such as splices and catch basins installed on the existing bridge when cutting the existing deck slab.

The cutting and division simulation (step S402) is initiated 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 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 has been adjusted so that it falls within the cutting and division dimension range described above.

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

In the position condition input process (step S403), the designer inputs conditions regarding the formation locations of jack-up holes and suspension holes into the design support device 21. In the position condition input process, the designer inputs the distance from the cut line 59, the existing support girders that support the jacks, the diameter of the jack-up holes, and the pitch range of the jack-up holes in the bridge axis direction and perpendicular to the bridge axis, as well as other conditions for the suspension holes. In addition, the designer inputs the distance from the cut line 59, the diameter and number of suspension holes, as well as other conditions for the suspension holes.

The positioning simulation (step S404) is initiated when the designer performs a positioning start operation on the design support device 21 after inputting the positioning conditions. 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.

Specifically, the design support device 21 performs a simulation regarding the formation positions of jack-up holes based on the cut-out data and positional conditions. In this simulation, the design support device 21 sets jack-up holes for each cut-out floor slab 60 in positions where the jack device will not interfere with the counter-tilt structures 55, splice plates 56, drainage basins 58, etc.

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

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 center of gravity position of each cutting floor slab 60. Then, for each cutting floor slab 60, based on the center of gravity position and position conditions, the design support device 21 sets the formation positions of the suspension holes so that the center positions of the multiple suspension holes in a top view overlap the center of gravity position of the cutting floor slab 60 and so that the lifting suspension devices do not interfere with the counter tilt structure 55, splice plate 56, drainage basin 58, etc.

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

Once the formation positions of the jack-up holes 61 and 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 suspension holes 62 in each cut-part deck 60 for the cut-part 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, the contractor prepares for and carries out construction work for the removal of the existing deck in the construction preparation process (step S104) and construction process (step S105).

The operation and effects of this embodiment will be described.
(1) According to the above embodiment, the existing deck slab is cut based on the 3D model of the existing bridge 50 and the cutting rules, and cutting data indicating the cut 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.

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

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

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

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 may be performed for the removal of the existing deck slab. This construction simulation visualizes the construction procedure of the renewal work in the 3D model by adding a time axis to the 3D model.

Various processes related to the construction simulation are performed on 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-partition deck slabs 60 to be removed and the removal work period, the number of new deck slabs to be installed and the installation work period, start date and time, start direction, etc., for one cycle of construction, with the removal of a cut-partition deck slab 60 and the installation of a new deck slab being considered as one cycle of construction. In the construction simulation, the server 100 displays or hides 3D models of the cut-partition deck slab 60, new deck slab, etc. based on the CIM data, existing deck slab design data, new deck slab design data, and the construction procedure rules.

- In the above embodiment, the formation positions of the jack-up holes 61 and suspension holes 62 in each cut-partition deck 60 were set by positioning simulation. However, this is not limited to this, and the formation positions of the jack-up holes 61 and suspension holes 62 may be determined by the contractor at the construction site.

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

- In the above embodiment, the under-road point cloud data was acquired using the under-road camera 26 mounted on the mobile robot 25. This is not a limitation, and the under-road point cloud data may also be acquired, for example, using an imager mounted on an unmanned aerial vehicle. Furthermore, the under-road point cloud data may also be acquired using a laser measuring device mounted on an unmanned aerial vehicle, or using a laser measuring device 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 device.

10...Support system, 20...Design support system, 21...Design support device, 22...Unmanned aerial vehicle, 23...Road camera, 25...Mobile robot, 26...Underground camera, 27...Mobile device, 28...Erection member, 29...Roller, 30...Fabrication support system, 31...Fabrication 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 (4)

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 ;
A bridge renewal method comprising: cutting and dividing the existing deck slab in accordance with the arrangement of the specified accessories ; and creating cutting and dividing data indicating the cut and divided deck slab. The bridge renewal method according to claim 1 , wherein the support system designs the formation positions of the jack-up holes in each cut-out deck slab based on the cut-out data and the position conditions of the jack-up holes. The bridge renewal method according to claim 1 , wherein the support system designs the formation positions of the suspension holes in each cut-out deck slab based on the cut-out data and the position conditions of the suspension holes. 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 ;
A support system that cuts and divides the existing deck corresponding to the arrangement of the specified accessories , and creates cut and divide data that indicates the cut and divide floor.