JP2022014762A - Bridge girder inspection device - Google Patents

Abstract

To provide a bridge girder inspection device which can perform inspection by an X-ray source and a detector facing each other on a lateral wall of a box girder that supports the load of a bridge.SOLUTION: A bridge girder inspection device for inspecting the strength of a hollow box girder whose lateral and bottom surfaces are closed among the girders that support the load of a bridge, the bridge girder inspection device having a detector that is adjustably arranged on the outer surface of the box girder by an arm extending downward from an inspection vehicle on the bridge, an X-ray source that is carried in from a gateway intermittently provided on the lower surface of the box girder so as to be arranged on the inner surface of the box girder to irradiate the detector with X-rays, and a rangefinder that measures the internal position to the X-ray source and the external position to the detector with respect to the gateway. The bridge girder inspection device is provided with means for adjusting the position of the detector so as to face the X-ray source across the side surface of the box girder with reference to the internal position and the external position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bridge girder inspection device for inspecting the strength of a girder that supports a load of a bridge.

A bridge is a structure that can be erected to cross a river that blocks a road. For example, there are girder bridges that are provided with (main) girders on the lower surface to support the load and are supported by abutments arranged at both ends or intermediate piers. Types of girders include I girders, (reverse) T girders, box girders, etc., and the strength is improved by passing reinforcing bars or the like through the concrete.

Defects or deterioration such as cavities in concrete or corrosion of reinforcing bars reduce the strength and require inspection, but the underside of the bridge is often difficult to work with. As described in Patent Document 1, the invention of an inspection device for a steel box girder bridge that can quickly and accurately inspect a steel box girder bridge and also inspect a steel box girder bridge at any place. It has been disclosed.

Further, as described in Patent Document 2, the state such as a defect or deterioration of the T-shaped girder supporting the load of the bridge is not contacted even at high altitude while keeping the X-ray source and the detector facing each other. We have applied for the invention of a bridge girder inspection device that can be inspected at.

Japanese Unexamined Patent Publication No. 2001-146714 Japanese Patent Application No. 2020-070530

However, in the technique described in Patent Document 1, a traveling wheel is hung on a flange of a steel box girder to suspend a traveling unit, and the traveling unit is inspected by a TV camera while moving the traveling unit. It is difficult to detect deterioration such as cracks inside the box girder and rust on the reinforcing bars of the box girder bridge.

Further, in the technique described in Patent Document 2, the T-shaped girder is sandwiched between an X-ray source and a detector for imaging, but the box girder can enter the inside through an intermittently existing doorway. However, it is difficult to make the X-ray source and the detector accurately face each other because the lower part is basically not open.

Therefore, an object of the present invention is to provide a bridge girder inspection device capable of inspecting a side wall of a box girder that supports a load of a bridge by facing an X-ray source and a detector.

In order to solve the above problems, the first invention is a bridge girder inspection device for inspecting the strength of a hollow box girder in which the side surface and the lower surface are closed among the girders supporting the load of the bridge. The detector is carried in from a detector that is position-adjustably arranged on the outer surface of the box girder by an arm extending downward from the inspection vehicle on the bridge, and an entrance / exit intermittently provided on the lower surface of the box girder. An X-ray source placed on the inner surface of the box girder to irradiate the device with X-rays, and a distance meter that measures the internal position to the X-ray source and the external position to the detector with reference to the entrance / exit. The detector is provided with a means for adjusting the position of the detector so as to face the X-ray source with the side surface of the box girder sandwiched between the internal position and the external position. ..

The second invention is a bridge girder inspection device for inspecting the strength of a hollow box girder whose side surface and lower surface are closed among the girders supporting the load of the bridge, from the inspection vehicle on the bridge. The X-ray source arranged on the outer surface of the box girder by the arm extended downward and the X-rays carried in from the entrance / exit intermittently provided on the lower surface of the box girder and irradiated from the X-ray source. It has a detector arranged on the inner surface of the box girder for the purpose, and a distance meter for measuring the internal position to the detector and the external position to the X-ray source with reference to the entrance / exit, and has the inside. It is characterized by comprising means for adjusting the position of the detector so as to face the X-ray source with the side surface of the box girder sandwiched between the position and the external position.

In the bridge girder inspection device, the distance meter is a laser range finder, and is characterized in that the internal position or the external position is measured from the distance to the detector or the target marker attached to the X-ray source. do.

In the bridge girder inspection device, the rangefinder is supported on a platform installed extending upward from an aerial worker on the ground or extending downward from an inspection vehicle on the bridge. It is a feature.

The bridge girder inspection device is characterized in that the X-ray source is provided with means for moving to a position designated as an inspection target of the box girder and adjusting the direction and height.

The bridge girder inspection device is characterized in that the spatial shape of the box girder is acquired in advance by a three-dimensional scanner.

Further, the third invention is a bridge girder inspection method for inspecting the strength of a hollow box girder whose side surface and lower surface are closed among the girders supporting the load of the bridge, and is installed below the box girder. The X-ray source parts were sequentially carried from the platform to the entrance / exit provided intermittently on the lower surface of the box girder, and were carried so as to face the detector arranged on the outer surface of the box girder. It has a step of assembling the X-ray source component and arranging it on the inner surface of the box girder, and the position of the elevating means for remotely lifting the X-ray source component from the platform to the doorway is a camera. When the X-ray source is visually guided by the above-mentioned entrance / exit, the crossing plate is unfolded from the elevating means, and the parts of the X-ray source are carried and carried into the box girder.

Further, the fourth invention is a bridge girder inspection system for inspecting the strength of a hollow box girder whose side surface and lower surface are closed among the girders supporting the load of the bridge, from the inspection vehicle on the bridge. The X-ray is carried in from an X-ray source equipped with a sensor, which is position-adjustably arranged on the outer surface of the box girder by an arm extended downward, and an entrance / exit intermittently provided on the lower surface of the box girder. A position-adjustably mounted detector placed on the inner surface of the box girder to receive X-rays emitted from the radiation source, and the internal position to the detector with reference to the doorway and the entrance and exit. It has a control device that measures the external position to the X-ray source with a distance meter and receives it via a communication means, and the control device has the X-ray source in the box while confirming the position with the sensor. The arm is instructed to move to a position designated as a girder inspection target, and the X-ray source and the detector face each other with the side surface of the box girder sandwiched between the internal position and the external position. It is characterized in that the movement is instructed to the trolley so as to do so.

According to the present invention, the X-ray source and the detector can be inspected facing each other on the side wall of the box girder that supports the load of the bridge. Extend the arm from the bridge with the X-ray source or detector located inside the box girder, even if the bridge is located high above the ground and the doorways that are intermittently present in the box girder are spaced apart. The detectors or X-ray sources arranged in the same position can be aligned so as to face each other across the side wall through which the reinforcing bar passes.

It is a schematic diagram which shows the structure of the bridge girder inspection apparatus of this invention. It is a photograph which shows the bridge girder inspected by the bridge girder inspection apparatus of this invention. It is a schematic diagram explaining the alignment of the bridge girder inspection apparatus of this invention. It is a transparent perspective view explaining the positioning of the bridge girder inspection apparatus of this invention. It is a schematic diagram which shows another structure of the bridge girder inspection apparatus of this invention. It is a figure explaining the carry-in of the bridge girder inspection apparatus of this invention. It is a figure explaining the carry-in of the bridge girder inspection apparatus of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Those having the same function are designated by the same reference numerals, and the repeated description thereof may be omitted.

First, the configuration of the bridge girder inspection device according to the present invention will be described. FIG. 1 is a schematic view showing the configuration of a bridge girder inspection device. FIG. 2 is a photograph showing a bridge girder to be inspected by a bridge girder inspection device. FIG. 3 is a schematic diagram illustrating the positioning of the bridge girder inspection device. FIG. 4 is a transparent perspective view thereof.

As shown in FIG. 1, the bridge girder inspection device 100 is a device for inspecting the state (for example, strength, etc.) of the box girder 210 provided in the longitudinal direction under the bridge 200 to support the load of the bridge 200. Is. The box girder 210 is a girder of the bridge 200 whose side surfaces and lower surfaces are closed, and is mainly made of concrete and has a hollow inside.

The bridge girder inspection device 100 mainly irradiates the side surface of the box girder 210 with X-rays from the X-ray source 600, and sandwiches the side wall 220 on the side surface of the box girder 210 with the X-ray source 600 on the opposite side. X-rays transmitted by the detectors 400 arranged so as to face each other are detected. That is, one of the X-ray source 600 and the detector 400 is arranged outside the box girder 210, and the other is arranged inside the box girder 210.

In the box girder 210, a reinforcing bar 240 such as a steel wire is passed through the inside of the side wall 220 (and the bottom wall) to reinforce the concrete. The number of the reinforcing bars 240 may be one or a plurality, and the outside of the reinforcing bars 240 is covered with the sheath 230.

For example, a plurality of reinforcing bars 240 are passed through one sheath 230 in advance, concrete is placed in a state where the plurality of sheaths 230 are arranged, and when the concrete is cured by curing the concrete, the reinforcing bars 240 are stretched in the sheath 230. It may be filled with a filler such as grout (non-shrink mortar) so that there are no gaps.

The sheath 230 is a pipe material made of resin or metal, and suppresses corrosion of the internal reinforcing bar 240. If the filling between the sheath 230 and the reinforcing bar 240 is insufficient and there are gaps or cavities in the sheath 230, water will accumulate due to the infiltration of rainwater or moisture condensation, and the reinforcing bar 240 will rust and deteriorate. There is a risk of disconnection.

Therefore, the bridge girder inspection device 100 has a detector 400 that is position-adjustably arranged on the outer surface of the box girder 210 by an arm 310 extending downward from the inspection vehicle 300 on the bridge 200, and intermittently on the lower surface of the box girder 210. The X-ray source 600, which is carried in from the entrance / exit 250 and is arranged on the inner surface of the box girder 210 to irradiate the detector 400 with X-rays, and the inside up to the X-ray source 600 with the entrance / exit 250 as a reference. Adjust the position of the detector 400 so that it faces the X-ray source 600 across the side surface of the box girder 210 based on the internal position and the external position with the laser range finder 530 that measures the position and the external position up to the detector 400. It shall be provided with means to do so.

The detector 400 is an image pickup sensor or the like capable of measuring the intensity and distribution of X-rays. When the X-rays emitted from the X-ray source 600 are detected, the signal data is transmitted to a computer mounted on the inspection vehicle 300 or a terminal device connected to a communication network, and the result is obtained after image processing by the control device. Is output to a monitor or the like. For example, by displaying an image transmitted through the side wall 220 of the box girder 210, the state of the concrete or the reinforcing bar 240 can be confirmed.

The X-ray source 600 irradiates X-rays, which are electromagnetic waves having a wavelength of about 1 pm to 10 nm. The X-rays radiated to the inspection point designated as the inspection target position of the side wall 220 spread radially and are partially absorbed, but pass through the side wall 220. By arranging the detector 400 at a position facing the X-ray source 600 across the side wall 220, the transmitted X-rays reach the detector 400.

When arranging the detector 400 on the outer surface of the inspection point, the detector 400 is attached to the tip of the arm 310 of the inspection vehicle 300 via the position adjusting means 320, and after the arm 310 approaches the inspection point, the position adjusting means The position of the detector 400 may be finely adjusted by remote control using the 320, such as the distance to the outer surface, the vertical and horizontal deviation, and the inclination.

Further, when the X-ray source 600 is arranged on the inner surface of the inspection point, the X-ray source 600 is carried in from the manhole-shaped entrance / exit 250 intermittently provided on the lower surface of the box girder 210, and the operator uses a trolley 700 or the like. The X-ray source 600 may be moved to the inspection point, and the distance to the inner side surface, the height, the left-right deviation, the inclination, and the like may be finely adjusted.

In addition, when adjusting the positions of the X-ray source 600 and the detector 400, it is necessary to identify the posture in order to make the X-ray source 600 and the detector 400 face each other, and it is necessary to identify the posture, and the tilt meter, the level meter, and the internal sensor (angle sensor). ) Etc. may be used to adjust the posture so that they face each other.

The laser range finder 530 is a range finder that irradiates an object with a laser beam such as infrared rays and measures the linear distance, the azimuth angle, and the angle of attack to the object by the reflected light. A means capable of calculating the distance from the reference position to the object may be used.

For example, based on the entrance / exit 250 of the box girder 210, the target marker 410 is attached to the detector 400, the target marker 610 is attached to the X-ray source 600, and the distance from the laser range finder 530 to the target marker 410 is used as a reference. The external position of the detector 400 may be calculated, and the internal position of the X-ray source 600 may be calculated based on the distance from the laser range finder 530 to the target marker 610.

If the reference position is determined, the laser range finder 530 is placed at a position where the target marker 610 can be recognized, and the laser range finder 530a is placed at a position where the target marker 410 can be recognized, and the common reference position is taken into consideration. Then, the internal position of the X-ray source 600 and the external position of the detector 400 may be calculated.

As shown in FIG. 2 (a), the bridge 200 is often high away from the ground because it is erected to cross a river or the like that blocks a road, and as shown in FIG. 2 (b), a box. Since the doorway 250 for maintaining the inside of the girder 210 is also opened at a long interval, it is difficult to match the external position and the internal position at the inspection point of the side wall 220.

As shown in FIG. 3, the laser range finder 530 and 530a may be attached to the elevating platform 510 of the aerial work platform 500 via the telescopic installation bases 520 and 520a.

Further, the trolley 700 on which the X-ray source 600 is mounted is provided with the moving means 710 and the position adjusting means 720, and the X-ray source 600 carried in from the entrance / exit 250 of the box girder 210 is inspected by remote control from the inspection vehicle 300. You may move it to a place and fine-tune the distance to the inner surface, height, left-right deviation, tilt, and so on.

The calculated internal position and external position are transmitted wirelessly or by wire from the laser range finder 530, 530a to the control device mounted on the inspection vehicle 300 or the like so that the control device faces the X-ray source 600 and the detector 400. In addition, instructions may be given to the position adjusting means 320 and 720. As a result, the external position and the internal position at the inspection point can be matched, and the detector 400 and the X-ray source 600 can face each other.

As shown in FIG. 4, for example, the laser range finder 530 is arranged at a position inside the box girder 210 from the doorway 250, and the laser range finder 530a is placed at a position protruding from the doorway 250 to the outer surface of the box girder 210. .. One of the laser range finder 530 is used as a reference position, and the relative position of the laser range finder 530a is acquired.

The distance to the X-ray source 600 is measured by the laser range finder 530, and the coordinates of the internal position are calculated in consideration of the azimuth angle 580 and the angle of attack 580a. Further, the distance to the detector 400 is measured by the laser range finder 530a, and the coordinates of the external position are calculated in consideration of the azimuth angle 580 and the angle of attack 580a. The positional deviation between the internal position and the external position may be calculated in consideration of the relative position of the laser range finder 530a, and it may be determined whether or not the X-ray source 600 and the detector 400 face each other.

The thickness of the side wall 220 and the like are also taken into consideration. If the irradiation direction of the X-ray source 600 is not horizontal but tilted, the detector 400 is also tilted so as to receive X-rays accordingly. When the sheath 230 in the side wall 220 overlaps and the back side cannot be inspected, the facing relationship between the X-ray source 600 and the detector 400 may be tilted.

FIG. 5 is a schematic diagram showing another configuration of the bridge girder inspection device. As shown in FIG. 5A, the bridge girder inspection device 100a includes an X-ray source 600 arranged on the outer surface of the box girder 210 by an arm 310 extending downward from the inspection vehicle 300 on the bridge 200, and the box girder. With reference to the detector 400 placed on the inner surface of the box girder 210 to receive the X-rays carried in from the entrance / exit 250 intermittently provided on the lower surface of the 210 and irradiated from the X-ray source 600, and the entrance / exit 250. The laser range finder 530 that measures the internal position up to the detector 400 and the external position up to the X-ray source 600, and the X-ray source 600 facing the X-ray source 600 across the side surface of the box girder 210 based on the internal position and the external position. A means for adjusting the position of the detector 400 is provided.

When the X-ray source 600 is arranged inside the box girder 210, it is placed on the trolley 700 and moved, but due to its weight, it may be difficult to move it unless the floor surface in the box girder 210 is flat. Further, since X-rays are emitted from the inside of the box girder 210 to the outside, a large amount of radiation is emitted to the outside.

When the X-ray source 600 is arranged outside the box girder 210, it is moved by the arm 310 of the inspection vehicle 300, so that the arm 310 needs to have enough strength to withstand the load of the X-ray source 600. Further, the inspection vehicle 300 needs to be able to travel with the arm 310 extended. The X-ray source 600 has parts such as an RF unit 600a that generates a high frequency to irradiate X-rays, but it is not necessary to separate the parts for each part if it is not necessary to pass through the small entrance / exit 250 of the box girder 210.

In order to arrange the X-ray source 600 on the outer surface of the inspection point, for example, a sensor 320a such as a camera is attached to visually capture an image of the side wall 220 near the inspection point, and the operator uses the position adjusting means 320. The captured image may be transmitted to the inspection vehicle 300 or the like and displayed on a monitor or the like so that fine adjustment can be made.

Further, when X-rays are irradiated from the outside to the inside of the box girder 210, the operator will evacuate to the outside of the box girder 210, and the position of the detector 400 will be adjusted many times. .. Therefore, as shown in FIG. 5 (b), the detector 400 carried into the box girder 210 from the entrance / exit 250 is mounted on the trolley 700 provided with the moving means 710 and the position adjusting means 720, and the power supply equipped with the control device. It may be remotely controlled by wire or wirelessly from a car 300b or the like. Even if the distance to the next inspection position is short, the operator can move the box girder without entering the box girder 210.

The laser range finder 530 that hits the target marker 410 of the detector 400 and the laser range finder 530a that hits the target marker 610 of the X-ray source 600 are on the platform 510 provided by the arm 310a of the inspection vehicle 300a, and the telescopic installation base 520. It may be attached via 520a. The platform 510 may be provided by the aerial work platform 500.

The power generator 300b is equipped with a control device such as a computer in addition to supplying power to various devices. The control device acquires the internal position of the detector 400 and the external position of the X-ray source 600 from the laser range finder 530 and 530a via a communication means with the entrance / exit 250 or the like as a reference position.

The control device instructs the position adjusting means 320 to move the X-ray source 600 to the inspection point of the box girder 210 while confirming the position by the sensor 320a, and the box girder 210 is based on the acquired internal position and external position. The X-ray source 600 and the detector 400 may be directed to the moving means 710 and the position adjusting means 720 of the trolley 700 on which the detector 400 is mounted so that the X-ray source 600 and the detector 400 face each other with the side wall 220 of the above.

When the X-ray is irradiated, the image pickup data is transmitted from the detector 400 to the control device, and the image pickup result can be confirmed on the power supply vehicle 300b. If there is a deviation in the imaging position, the control device may instruct the position of the X-ray source 600 or the detector 400 to be adjusted. If the imaging result is appropriate, the control device issues an instruction to move the inspection location to the next location.

6 and 7 are views for explaining the loading of the bridge girder inspection device. As shown in FIG. 6A, when the X-ray source 600 is carried into the box girder 210, the platform 510 is provided below the entrance / exit 250 of the box girder 210 by the arm 310 of the inspection vehicle 300.

The X-ray source 600 is divided into parts that can pass through the entrance / exit 250. The components are placed on the platform 520 of the platform 510, and the camera 570 is attached to the platform 510 as a visual guidance device. As shown in FIG. 6B, while checking the image taken by the camera 570 with the inspection vehicle 300, the arm 310 is operated so that the installation table 520 on which the parts are placed comes under the doorway 250.

As shown in FIG. 6 (c), the installation table 520 is raised, passed through the doorway 250, and the parts of the X-ray source 600 are lifted. As shown in FIG. 6 (d), when the parts are raised to the height of the bottom surface in the box girder 210 by the elevating means 540 of the installation table 520, as shown in FIG. 6 (e), the crossing plate 550 is removed from the elevating means 540. All you have to do is unfold it, build a bridge over the gap between the doorways 250, and transport the parts.

As shown in FIGS. 7 (a) and 7 (b), a plurality of parts are sequentially carried in by repeating this process, and each part is moved to an inspection point where the detector 400 is arranged by the transport means 560, and then the X-ray source 600 is used. Just assemble it. As shown in FIGS. 7 (c) and 7 (d), instead of the elevating means 540 that expands and contracts like a jack and lifts from below, the elevating means 540a that hangs from the inside of the box girder 210 and lifts may be used.

As the transportation means 560, the box containing the parts can be moved by casters, the boxes can be connected and pulled together, and the conveyor or the like can be arranged and transferred so as not to be affected by the unevenness in the box girder 210. You can do it.

Before arranging the X-ray source 600 and the detector 400, the inspection points of the box girder 210 may be marked in advance. The mark may be detected by a camera or the like to align the positions of the X-ray source 600 and the detector 400, or the coordinates of the mark and the coordinates of the X-ray source 600 and the detector 400 may be acquired and the X-ray source 600 may be obtained. And the detector 400 may be controlled to move to the mark. The coordinates may be acquired using GPS (Global Positioning System) or the like.

Further, the shape of the box girder 210 may be acquired in advance. By creating a stereoscopic image using a three-dimensional scanner such as a handheld scanner and associating it with the spatial coordinates, the positional relationship between the inspection point and the X-ray source 600 and the detector 400 may be grasped. By grasping the internal state of the box girder 210, it becomes possible to move the X-ray source 600 or the detector 400 while avoiding obstacles.

Since the laser range finder 530 identifies the position by looking directly at the object, it may be blocked if there is an obstacle such as a wall in the middle, but the X-ray source 600 and the detector 400 are based on the 3D model. It is effective for positioning if you guide to the inspection point.

According to the present invention, the X-ray source and the detector can be inspected facing each other on the side wall of the box girder that supports the load of the bridge. Extend the arm from the bridge with the X-ray source or detector located inside the box girder, even if the bridge is located high above the ground and the doorways that are intermittently present in the box girder are spaced apart. The detectors or X-ray sources arranged in the same position can be aligned so as to face each other across the side wall through which the reinforcing bar passes.

Although examples of the present invention have been described above, the present invention is not limited thereto. For example, it may be applied not only to the side wall of the box girder but also to the inspection of the bottom wall.

100: Bridge girder inspection device 100a: Bridge girder inspection device 100b: Bridge girder inspection device 200: Bridge 210: Box girder 220: Side wall 230: Sheath 240: Reinforcing bar 250: Doorway 300: Inspection car 300a: Inspection car 300b: Power supply car 310 : Arm 310a: Arm 320: Position adjusting means 320a: Sensor 400: Detector 410: Target marker 500: High-altitude work vehicle 510: Platform 520: Installation stand 520a: Installation stand 530: Laser range finder 530a: Laser range finder 540: Elevating means 540a: Elevating means 550: Crossing plate 560: Transporting means 570: Camera 580: Direction angle 580a: Intercepting angle 600: X-ray source 600a: RF unit 610: Target marker 700: Cart 710: Moving means 720: Position adjusting means

Claims (8)

A bridge girder inspection device for inspecting the strength of hollow box girders whose sides and bottom are closed among the girders that support the load of the bridge.
A detector that is position-adjustably placed on the outer surface of the box girder by an arm that extends downward from the inspection vehicle on the bridge.
An X-ray source that is carried in from an entrance / exit intermittently provided on the lower surface of the box girder and is arranged on the inner surface of the box girder to irradiate the detector with X-rays.
It has a rangefinder that measures the internal position to the X-ray source and the external position to the detector with reference to the entrance / exit.
A means for adjusting the position of the detector so as to face the X-ray source while sandwiching the side surface of the box girder based on the internal position and the external position is provided.
A bridge girder inspection device characterized by this. A bridge girder inspection device for inspecting the strength of hollow box girders whose sides and bottom are closed among the girders that support the load of the bridge.
An X-ray source placed on the outer surface of the box girder by an arm extending downward from the inspection vehicle on the bridge,
A detector placed on the inner surface of the box girder to receive X-rays carried in from an entrance / exit intermittently provided on the lower surface of the box girder and irradiated from the X-ray source.
It has a rangefinder that measures the internal position to the detector and the external position to the X-ray source with reference to the entrance / exit.
A means for adjusting the position of the detector so as to face the X-ray source while sandwiching the side surface of the box girder based on the internal position and the external position is provided.
A bridge girder inspection device characterized by this. The distance meter is a laser range finder and measures the internal position or the external position from the distance to the detector or the target marker attached to the X-ray source.
The bridge girder inspection device according to claim 1 or 2, wherein the bridge girder is inspected. The rangefinder is supported on a platform that extends upward from an aerial worker on the ground or extends downward from an inspection vehicle on the bridge.
The bridge girder inspection device according to any one of claims 1 to 3, wherein the bridge girder is inspected. The X-ray source is provided with means for moving to a position designated for inspection of the box girder and adjusting the orientation and height.
The bridge girder inspection device according to any one of claims 1 to 4, wherein the bridge girder is inspected. Obtaining the spatial shape of the box girder in advance with a three-dimensional scanner,
The bridge girder inspection device according to any one of claims 1 to 5, wherein the bridge girder is inspected. It is a bridge girder inspection method for inspecting the strength of a hollow box girder whose side surface and lower surface are closed among the girders that support the load of the bridge.
A process of sequentially carrying X-ray source parts from a platform installed below the box girder to an entrance / exit intermittently provided on the lower surface of the box girder.
It comprises a step of assembling the transported X-ray source parts and arranging them on the inner surface of the box girder so as to face the detector arranged on the outer surface of the box girder.
The position of the elevating means for remotely lifting the X-ray source component from the platform to the doorway is visually guided by the camera.
When it goes up to the doorway, the crossing plate is unfolded from the elevating means, and the parts of the X-ray source are carried and carried into the box girder.
A bridge girder inspection method characterized by this. A bridge girder inspection system for inspecting the strength of hollow box girders whose sides and bottom are closed among the girders that support the load of the bridge.
An X-ray source fitted with a sensor, which is position-adjustably located on the outer surface of the box girder by an arm extending downward from the inspection vehicle on the bridge.
Positionally adjustable trolley placed on the inner surface of the box girder to receive X-rays carried in from the entrance / exit intermittently provided on the lower surface of the box girder and irradiated from the X-ray source. With the detector
It has a control device that measures the internal position to the detector and the external position to the X-ray source with a range finder and receives them via a communication means with the entrance / exit as a reference.
The control device instructs the arm to move the X-ray source to the position designated as the inspection target of the box girder while confirming the position by the sensor, and bases the internal position and the external position. Instruct the trolley to move so that the X-ray source and the detector face each other across the side surface of the box girder.
A bridge girder inspection system characterized by this.

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