JP6950108B1 - How to check under the bridge deck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge underdeck inspection method capable of substituting a diagnosis of soundness by close visual inspection performed by an inspection engineer for a bridge underfloor structural member. SOLUTION: A leading cable passing through a space surrounded by a floor block copy structural member is laid between piers 1 of a bridge, and a linear path 4 for moving an image pickup device 5 is provided by using the leading cable. After bridging and acquiring an image of the floor block copy structural member by the imaging device 5, the linear path 4 is removed. [Selection diagram] Fig. 1

Description

The present invention relates to a bridge block copy inspection method for inspecting structural members under a bridge deck.

In the inspection of structural members, visual inspection and tapping sound inspection are widely and generally performed. However, since the structural members under the deck of the bridge are located at a high place, it is necessary for the inspector to provide an inspection passage for the structural members to be inspected to approach in order to carry out the tapping sound inspection. Then, various techniques for providing an inspection passage have been proposed.

For example, Japanese Patent Application Laid-Open No. 1-125404 proposes a permanent inspection passage device for bridges that can be easily assembled at an installation site and can be installed in a place where interference with an anti-tilt structure or lateral bracing occurs. ing.

On the other hand, in recent years, there has been an increasing need for efficient inspections utilizing new technology (hereinafter referred to as "inspection support technology") aimed at supporting regular inspections of road facilities. In the revision of the inspection procedure, it has become possible to carry out efficient inspections utilizing inspection support technology at the discretion of a person who has the knowledge and skills to perform regular inspections (hereinafter referred to as "inspection technician"). Then, in the bridge periodic inspection procedure in February 2019, "If the person performing the periodic inspection determines that the person performing the periodic inspection can perform the same soundness diagnosis as the case of close visual inspection, the person performing the periodic inspection will be able to perform the diagnosis. Other methods can also be considered as a range based on close-up visual inspection. "

In addition, as a reference material that can be used together with the bridge periodic inspection procedure so that road managers can smoothly utilize the inspection support technology in the second round inspection from the first year of Reiwa, the Ministry of Land, Infrastructure, Transport and Tourism has announced that "Inspection" Assistive technology performance catalog (draft) ”(hereinafter referred to as“ performance catalog ”) was created. This performance catalog includes a total of 16 technologies, including a technology for taking close-up photos of facilities with a small wirelessly operated vehicle (commonly known as a "drone") and a camera attached to the vehicle, and a technology for non-destructive inspection of concrete swelling and peeling with infrared rays. The technology has been posted and the use of the technology has started.

Japanese Unexamined Patent Publication No. 1-125404

Bridge periodic inspection procedure Ministry of Land, Infrastructure, Transport and Tourism Inspection support technology performance catalog (draft) Ministry of Land, Infrastructure, Transport and Tourism

When an inspection technician diagnoses the soundness of road facilities, it is necessary to grasp the condition based on close visual inspection, but in order to further rationalize regular inspection, a new inspection method that does not rely on close visual inspection Development is required. For example, automatic diagnosis is performed from images taken by drones using AI technology, etc., and soundness is diagnosed by directly measuring and evaluating the load bearing capacity of members that make up road facilities using measurement / monitoring technology. A method of doing it can be considered. Then, by positively utilizing these techniques / methods, it is conceivable to replace the diagnosis of soundness by close visual inspection performed by an inspection engineer and reduce and rationalize the amount of work by close visual inspection.

Therefore, an object of the present invention is to provide a bridge block copy inspection method that can replace the diagnosis of soundness by close visual inspection performed by an inspection engineer for a bridge block copy structural member.

In the bridge deck inspection method according to the present invention, a leading cable passing through a space surrounded by a floor slab structural member is laid between bridge pedestals of a bridge, and the preceding cable is used to move an imaging device. Is bridged over a space surrounded by the underfloor structural member, an image of the underfloor structural member is acquired by the imaging device, and then the streak is removed.

The leading cable may be bridged using an air vehicle.

The streak may be composed of a set of parallel cables, and the image pickup device may run on the parallel cables.

The image pickup apparatus includes a base on which an image pickup means is placed and a plurality of wheels that engage with the parallel cable and support the base on the linear road, and each of the plurality of wheels is independently driven. It may be something to do.

According to the bridge block copy inspection method according to the present invention, a linear path for moving the image pickup device, which passes through the space surrounded by the floor block copy structural member, is laid between the piers of the bridge, and the image pickup device is used. Through the acquired image, a visual inspection of the floor block copy structural member can be performed. Moreover, since the streak is removed after the inspection is completed, the inspection for maintaining the streak becomes unnecessary. Therefore, it is possible to inspect the underfloor structural member of the bridge without the diagnosis of soundness by close visual inspection performed by an inspection engineer.

In addition, since the lead cable is used to bridge the line, even in a narrow space surrounded by the floor block copy structural members, the leading cable can be bridged by making it thin and lightweight. Become. If the leading cable is bridged using an air vehicle, it can be easily bridged in a short time as needed without requiring ancillary work such as scaffolding installation work. However, there is no limitation on the method of connecting the leading cable, and an appropriate method may be adopted depending on the situation.

Furthermore, if the streak is composed of a set of parallel cables and the imaging device runs on the parallel cables, inspection of the part directly under the floor slab of the underfloor structure that cannot be visually inspected from the underside of the bridge. Is also possible.

Furthermore, the imaging device includes a base on which the imaging means is placed and a plurality of wheels that engage with a parallel cable and support the base on a linear road, and each of the plurality of wheels is independently driven. If so, it is possible to drive on the slack road even if it is in a slack state, and even if some wheels are removed from the cable, if other wheels are hung on the cable. , It becomes possible to run. In other words, by preventing a stop due to an accident while driving, a part that cannot be visually inspected from under the bridge should be inspected without taking time and effort without having to perform a close-up visual soundness diagnosis performed by an inspection technician. Is possible.

It is a perspective view which shows the floor block copy structural member which carries out the bridge block copy inspection method which concerns on this invention. It is a perspective view which shows the embodiment of the image pickup apparatus.

An embodiment of the bridge deck block copy inspection method according to the present invention will be described with reference to FIGS. 1 and 2. In this embodiment, it is assumed that a plurality of I-shaped steels 2 erected on the pier 1 and an anti-tilt structure 3 provided between the I-shaped steels are inspected. That is, in this embodiment, the I-shaped steel 2 and the anti-tilt structure 3 are the floor block copy structural members to be inspected. In addition, in FIG. 1, in order to facilitate understanding of the embodiment, details such as a floor slab constructed above the I-shaped steel and a bearing on which the I-shaped steel is placed are omitted. Also, the dimensional ratio of each member is not accurate.

Between the piers 1, a linear road 4 passing through a space surrounded by the I-shaped steel 2 and the anti-tilt structure 3 is bridged. Then, the image pickup apparatus 5 is moved along the linear path 4, and the I-shaped steel 2 and the anti-tilt structure 3 are visually inspected through the image acquired by the image pickup apparatus 5.

The streak 4 is bridged using a leading cable (not shown) bridged between the piers 1 using an air vehicle (not shown). The leading cable may be laid by an appropriate method depending on the situation. In this embodiment, it is assumed that a known wirelessly operated flying object called a drone is used for bridging, but if the space is surrounded by the floor block copy structural member and a person can move, it is assumed. It may be handed over by human hands.

As the leading cable, it is preferable to use a cable (PE line) in which a plurality of ultra-fine raw yarns of high molecular weight polyethylene are woven or bundled to form a single cable. However, the preceding cable may be of a weight that is surrounded by the structural members under the floor block and can be transported in the space, and may have the strength required for the bridging work of the line road 4, and the situation at the work site, etc. A known cable suitable for the above may be used. For example, a nylon line made of a polyamide material, a fluorocarbon line made of a polyvinylidene fluoride material, or an ester line such as a monofilament using a polyester material may be used.

The line road 4 is composed of a set of parallel cables. Both ends of the streak road 4 are fixed to columns (not shown) temporarily provided on the pier 1, and the whole is stretched by the tension generated at both ends. Then, the vehicle equipped with the image pickup device 5 is supposed to be able to travel on the vehicle. The parallel cable constituting the linear path 4 preferably has a low elongation rate, and for example, a static rope made for the purpose of being used for rescue activities, aerial work, or the like can be used.

Both ends of the linear path 4 may be stretched to such an extent that the imaging device 5 can move on the linear path 4, and may be fixed in a state that does not interfere with the removal work of the linear path 4, and the fixing method is limited. No. A known fixing method suitable for the situation at the business site may be adopted, but for example, by using a ratchet type belt in combination, the tension can be stronger than that of the line road 4.

The image pickup apparatus 5 includes a base 7 on which the image pickup means 6 is placed, and four wheels 8 that engage with the parallel cables constituting the line 4 and support the base 7 on the line 4. There is.

The imaging means 6 is equipped with a known high-resolution camera and a zoom lens, and is provided with a control mechanism for remote control.

The high-resolution camera of this embodiment has a resolution of 24 million pixels, the lens can be adjusted remotely in the range of 18 mm to 105 mm, and fine coating film cracks that lead to the discovery of fatigue cracks in steel materials are photographed. It has become something that can be done.

The control mechanism of the high-resolution camera of this embodiment is capable of checking the shooting screen, turning the camera 360 degrees, and tilting the camera from 45 degrees downward to 90 degrees upward in the vertical direction by remote control. It is attached.

Further, the image pickup means 6 is equipped with LED lighting, and by illuminating the inspection target portion even under a bridge where light is difficult to be inserted, an image focusing on the inspection portion can be acquired. The image pickup apparatus 5 may be further equipped with a high-resolution strobe (flashlight) and linked with the photographing means 6 to secure the photographing illuminance in a portion where a shadow is formed near the structural portion.

The base 7 is composed of a metal rectangular frame 9 and a mounting plate 10 arranged at the center of the rectangular frame 9. A fixing portion 11 for detachably fixing the image pickup means 6 is provided on the upper surface of the mounting plate 10. Further, a battery 12 for driving the wheel 8 is arranged on the lower surface of the mounting plate 10.

Motors 13 are attached to the four corners of the rectangular frame 9. Each of the four wheels 8 is attached to each motor 13 and is driven independently.

Since the image pickup device 5 moves on the linear path 4, the image pickup device 5 does not be in a situation where it cannot be photographed due to the weather, unlike a flying object. In addition, since it is possible to stop on the line road 4, more stable shooting becomes possible as compared with the case of shooting while moving by the flying object. Further, since it moves on the line road 4, it can be equipped with a device that is heavier than the flying object.

The configuration of the image pickup device 5 is not limited as long as it has a function of arbitrarily adjusting the shooting direction of the mounted image pickup means and storing the acquired image while moving. A known device and device may be appropriately combined, but in order to enable smooth movement of the image pickup device 5 on the linear path 4, the center of gravity of the image pickup means 6 is set to the base 7 as much as possible. It is preferable to bring them closer.

1 Pier 2 I-shaped steel 3 Anti-tilt structure 4 Lines 5 Imaging device 6 Imaging means 7 Base 8 Wheels 9 Rectangular frame 10 Mounting plate 11 Fixed part 12 Battery 13 Motor

Claims (4)

A leading cable that passes through a space surrounded by the underfloor structural member is laid between the bridge pedestals of the bridge, and the leading cable is used to provide a linear path for moving the image pickup apparatus to the underfloor structural member. A bridge deck inspection method, characterized in that the bridge is bridged over a space surrounded by a bridge, an image of the floor slab structural member is acquired by the imaging device, and then the streak is removed. The bridge deck inspection method according to claim 1, wherein the preceding cable is bridged using an air vehicle. The bridge deck block copy inspection method according to claim 1 or 2, wherein the line road is composed of a set of parallel cables, and the image pickup device travels on the parallel cables. The image pickup apparatus includes a base on which an image pickup means is placed and a plurality of wheels that engage with the parallel cable and support the base on the linear road, and each of the plurality of wheels is independently driven. The bridge deck block copy inspection method according to claim 3.

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