Steel bridge maintenance methods

Abstract

To provide a method of maintaining a steel bridge which does not need traffic regulation, and so on, when performing a blast treatment.SOLUTION: A method of maintaining a steel bridge includes: a scaffolding step of forming a scaffold 10 covering a predetermined portion of a steel material 2 in a steel road bridge 1; a device arranging step of arranging a blast device 20, an electric generator 30, and a compressor within the scaffold 10; and a blast step of performing a blast treatment on the steel material 2 within the scaffold 10 by using the blast device 20. The method does not needs to depend on the exterior for an installation place of the blast device 20, the electric generator 30, and the compressor. For example, even if a steel road bridge exists across the sea or a river, the method need no lane regulation, and so on, thereby eliminating the concern of traffic congestion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a maintenance method for steel bridges, including performing blasting treatment on the steel parts of existing steel bridges.

Background Art

[0002] Conventionally, in existing steel bridges, maintenance (preventive maintenance) has been carried out for the renewal of paint whose corrosion has progressed due to aging deterioration. As maintenance, since it is necessary to remove rust and old paint films, in recent years, rust and paint films have been removed by blasting treatment (type 1 keren), and then new paint has been applied.

[0003] In this blasting treatment, since abrasive materials, rust, old paint films, etc. scatter, it is necessary to form a scaffold for providing a work space that properly covers the steel parts. Generally, as disclosed in Patent Document 1 for example, a blasting device is installed at a predetermined position outside the scaffold, and a hose is drawn into the scaffold to perform the work.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in steel bridges spanning over the sea or a river, since there is no place to place a blasting device under the steel bridge, for example, for steel bridges, once the road is regulated and then a blasting device is installed in the regulated section. However, in this case, the time and high cost for starting and解除 the regulation of the road become problems, and there is also a problem of causing traffic congestion.

[0006] Furthermore, in order to accommodate the increasing scale of construction projects and the construction of long bridges over the sea and rivers, it was necessary to consider improving the output of machinery (such as increasing suction power) in addition to road regulations. On the other hand, there was also a need to respond to the global transition to decarbonization. Moreover, commonly used suspended scaffolding did not have the strength to support large machinery.

[0007] Therefore, the present invention aims to provide a maintenance method for steel bridges that eliminates the need for road restrictions and the like. [Means for solving the problem]

[0008] The present invention relates to a steel bridge maintenance method that includes performing blast treatment on the steel portion of an existing steel bridge, comprising: a scaffolding formation step of forming a scaffold for performing the blast treatment on the steel bridge while it is suspended from the steel bridge; a blast device placement step of arranging a blast device on the scaffolding; and a blast step of performing blast treatment by projecting abrasive material onto the steel portion using the blast device, and in which the projected material is recovered into the blast device, wherein the projected material recovered into the blast device is reused for the blast treatment.

[0009] In this configuration, by placing the blasting device on the scaffolding, there is no need to create space on the ground surface beneath the steel bridge to install the blasting device. Furthermore, since there is no need to restrict road traffic during maintenance work on steel road bridges, the problem of traffic congestion is also resolved. In this invention, scaffolding with sufficient strength is used to install the blasting device.

[0010] Furthermore, the blasting apparatus arrangement step is proposed to include a configuration in which the area is divided into a specific hazardous substance area where the steel portion is located and a non-specific hazardous substance area other than the specific hazardous substance area, so that the specific hazardous substances contained in the coating film peeled off from the steel portion in the blasting step are recovered by the blasting apparatus.

[0011] This configuration prevents specific hazardous substances from leaking outside the scaffolding.

[0012] Furthermore, a configuration is proposed in which the blasting equipment placement process also includes placing a generator, which will be the power source for driving the blasting equipment, and a compressor for driving the blasting equipment, on the scaffolding.

[0013] This configuration allows for the centralized management of all equipment, including the power generation system, in one location. In particular, since no power source is required outside the scaffolding, there is no need to secure a separate power source even at isolated work sites such as steel bridges on the sea.

[0014] Herein, a configuration is proposed in which the blasting equipment placement step includes placing oil leakage prevention means on the scaffolding to prevent oil discharged from the generator and compressor from leaking from inside the scaffolding into the space outside the scaffolding.

[0015] This configuration prevents oil from leaking to inappropriate locations. [Effects of the Invention]

[0016] The steel bridge maintenance method of the present invention has the effect of eliminating the need for road closures, etc., when performing blast treatment. [Brief explanation of the drawing]

[0017] [Figure 1] This is an explanatory diagram of a steel road bridge according to the example. [Modes for carrying out the invention]

[0018] The following describes in detail an embodiment of the steel bridge maintenance method according to the present invention. However, the present invention is not limited to the embodiments shown below, and design modifications can be made as appropriate.

[0019] As shown in FIG. 1, a steel road bridge 1, which is a steel bridge, has a road 3 for vehicles to pass on the upper part based on steel materials 2. As a maintenance method for such a steel road bridge 1, first, a scaffold 10 that covers a predetermined part of the steel material 2 is formed (scaffold forming step). In this case, it is common to form the scaffold 10 by suspending it from the steel road bridge 1 using a suspension tool 11 such as a suspension chain.

[0020] In addition, in the above-mentioned scaffold forming step, as an oil leakage prevention means for preventing the oil discharged from a generator 30 and a compressor 32, which will be described later, from leaking outside the scaffold when forming the scaffold 10, an oil pan 31 is arranged at the part where the generator 30 and the compressor 32 are arranged. Note that, as an oil leakage prevention means, instead of the oil pan 31, a configuration for preventing oil leakage by using a metal plate on the scaffold floor may be adopted.

[0021] Next, a blasting device 20 and a generator 30 that serves as the power source for the blasting device 20 are arranged on the formed scaffold (blasting device arrangement step). Furthermore, a compressor 32 is also arranged. Here, the blasting device 20 has a function of storing a grinding material (projectile material) for grinding the steel material 2, projecting the grinding material, and collecting the projected grinding material and the like. The compressor 32 generates compressed air used when driving the blasting device 20 to project the grinding material. The generator 30 supplies power to the blasting device 20, the compressor 32, and the like. All of them are arranged outside the steel material 2 (on the external space side) within the scaffold 10. When collecting the grinding material into the blasting device 20, dust such as rust and peeled paint films generated in the blasting process is also collected.

[0022] The dust collected here is accumulated at a predetermined part of the blasting device 20 and regularly carried out of the scaffold.

[0023] After arranging the blasting device 20, the generator 30, the compressor 32, etc. in this way, a blasting process is executed on the steel material 2 at a predetermined location within the scaffold 10 using the blasting device 20. At this time, the predetermined location 40 within the scaffold 10 where the blasting process is executed is further partitioned to prevent dust and the like from scattering outside. In the case of this embodiment, the predetermined location 40 is a specific hazardous substance area α, and the other scaffold areas are non-specific hazardous substance areas β. Specifically, the specific hazardous substance area α is divided into a blasting device installation area including the blasting device 20 and a blasting work area partitioned from the device installation area by an isolation wall S composed of, for example, a predetermined curing sheet or the like.

[0024] By performing the maintenance work of the steel bridge in this way, the following effects can be achieved.

[0025] There is no need to install the blasting device, the generator, etc. outside the scaffold, and there is no need to select and regulate the installation location. For example, in the case of a steel road bridge spanning over the sea or a river, there is no need to implement lane restrictions, there is no concern about traffic congestion, and the construction cost can be significantly reduced.

[0026] It is possible to prevent specific hazardous substances from leaking outside the scaffold.

[0027] It is also possible to cope with oil leakage from the generator and the compressor.

[0028] In addition, for example, by making the inside of the scaffold a clean room, it is possible to further prevent the leakage of specific hazardous substances. Noise countermeasures can be taken by covering the scaffold with soundproof panels or the like. When the power for the blasting device can be brought in from the outside, for example, by installing a cubicle device, the carbon dioxide emissions can be significantly reduced. In this case, when it is necessary to ensure the separation distance of the machine according to the Fire Service Act or the like, as one solution, for example, a configuration of making a partition wall with an iron plate or the like is proposed. Further, the blasting device may be arranged on the rails laid on the scaffold, and the blasting process may be advanced while moving the blasting device along the rails. [Explanation of Symbols]

[0029] 1 Steel road bridge (steel bridge) 2 Steel material (steel part) 3 road 10 Scaffolding 20. Blasting equipment 30 generators 31 Oil pan 32 Compressors 40 Specified locations (specific hazardous substance area α)

Claims

[Claim 1] A method for maintaining a steel bridge, comprising performing blast treatment on the steel portion of an existing steel bridge on which vehicles pass, with steel materials as the foundation, A scaffolding formation step is to form a scaffolding for performing the blast treatment on the steel bridge, while suspending it from the steel bridge using suspension devices, A blast apparatus arrangement step involves arranging a blast apparatus on the aforementioned scaffolding that has the function of storing the blast material, blasting the blast material, and collecting the blasted blast material. A blasting process is performed by projecting a projectile onto the steel portion using the blasting apparatus, and the projectile is recovered into the blasting apparatus. Includes, The abrasive material recovered in the blasting apparatus is reused in the blasting process. The blasting apparatus placement step includes: The area is divided into a specific hazardous substance area where the steel portion is located and a non-specific hazardous substance area other than the specific hazardous substance area, and the specific hazardous substances contained in the coating film peeled off from the steel portion in the blasting process are recovered by the blasting device. The aforementioned area containing specific hazardous substances is divided into a blast equipment installation area that includes a blast equipment, and a blast work area that is separated from the blast equipment installation area by an isolation wall made of a predetermined protective sheet. The scaffolding also includes a generator that serves as a power source to drive the blasting device, and a compressor for generating compressed air used when the blasting device is driven and the abrasive material is projected, and the generator also supplies power to the compressor. As a means of preventing oil leakage to prevent oil discharged from the generator and compressor from leaking from inside the scaffolding into the space outside the scaffolding, this includes placing an oil pan or a metal plate on the scaffolding in the area where the generator and compressor are located. The blasting process includes: When the abrasive material is collected back into the blasting machine, debris such as rust and peeled paint generated during the blasting process is also collected. The aforementioned waste is collected in a designated area of ​​the blasting device and then transported away from the scaffolding. A steel bridge maintenance method characterized by the following features.

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