JP2000226816A - Inspection device for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and accurately detect a faulted condition caused by fatigue and corrosion, etc., of a lower surface part of a bridge thoroughly by attaching a detecting device on a lower surface of the bridge with a simple means. SOLUTION: This device consists of a detecting device 2 having a camera 4 on an upper part of a balloon 3 freely to float in the air, a pair of right and left rope supporting devices 6a, 6b for holding so as to freely move the detecting device 2 through a rope 14 connected with both sides of the detecting device 2. Then, the rope supporting devices 6a, 6b are provided with a base 8 with a winch mounted on bridge facilities, and a guide arm 12 rotatively connected on the base 8 so as to extend the rope 14 in a vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for investigating damages caused by fatigue and corrosion of a girder and concrete at a portion of a lower surface of an existing bridge that is difficult to see.

[0002]

2. Description of the Related Art Conventionally, as an operation for checking the state of damage caused by fatigue or corrosion of a girder or concrete located at a position where the lower surface of a bridge is difficult to see, a worker looks through a bridge from below with binoculars or the like. In addition, an inspection vehicle with a camera installed at the end of the telescopic arm mounted on the vehicle is placed under the bridge, the camera is approached to the inspection point by operating the telescopic arm, and there is damage, and the degree of damage while looking at the monitor And so on.

[0003] However, the method of viewing with binoculars is as follows.
Only the part that can be seen directly from under the bridge can be inspected,
In some cases, damage that occurs in parts that are difficult to see directly from below, such as hidden behind the uneven surface of the member, may be overlooked.

[0004] Inspection by an inspection vehicle having a camera mounted at the end of the telescopic arm does not pose a problem if a space where the inspection vehicle can be always arranged below the bridge is not problematic. In the case of a bridge that is constructed, or a bridge that is installed on an intersection or an overpass, an inspection car cannot be parked, so inspection work cannot be performed at any location. There is a problem that is limited.

[0005] For this reason, conventionally, a cable is stretched from above the bridge to the lower surface of the bridge, and a detecting device is suspended from the cable, and the cable is wound up. An inspection system adapted to perform an inspection is disclosed in Japanese Patent Application Laid-Open No. 63-206505.

[0006]

However, this inspection system is for inspecting a pipeline such as a telephone line arranged along the bridge axis direction on the lower surface of the bridge, and therefore, the inspection system is provided on the lower surface of the pipeline. As a procedure for stretching a traveling cable parallel to the pipeline suspending the detection device, first, two support cables are stretched on a lower surface of the bridge in a bridge width direction (a direction perpendicular to the pipeline). A process of stretching a traveling cable with a detection device suspended between the two supporting cables is required, and there is a problem that a process for erection of the cable is complicated.

[0007] Further, there is a problem in the suspending means of the detection device because both ends of the traveling cable from which the detection device is suspended are suspended by two other supporting cables. When moving to the center of the pipe, it hangs down greatly due to its own weight and the weight of the traveling and supporting cables and separates from the pipeline to be inspected, so that the lower surface of the pipeline cannot be detected at an equal distance. When the detecting device is moved along the bridge width direction on the lower surface of the bridge to use it as a means for inspecting the lower surface structure of the bridge other than the pipeline, the two devices supporting both ends of the traveling cable on which the detecting device is suspended are used. Because the distance between the supporting cables is so large, the control of moving these two supporting cables by the same distance at the same time becomes complicated, and it is difficult to perform inspection work. There is a problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems of the conventional bridge inspection device, and has a simple structure in which a detection device is attached to the lower surface of the bridge to reduce the lower structure of the bridge. It is an object of the present invention to provide an inspection device capable of efficiently and efficiently detecting.

According to the first aspect of the present invention, as a means for achieving this, the detection device is provided with a camera above the balloon and can float in the air, and the detection device can be freely connected via ropes connected to both sides of the detection device. It consists of at least a pair of left and right rope support devices for holding so that it can be moved to,
The rope support device includes a base with a winch provided in a bridge facility, and a guide arm rotatably connected on the base so as to extend the rope in a vertical direction. I do.

According to a second aspect of the present invention, there is provided a base having a winch in which a rope supporting device is movably disposed on a bridge facility, and a pair of parallel guide arms rotatably connected to the base. The detection device is characterized in that both right and left sides of the detection device are supported by a pair of parallel ropes extending from the parallel guide arms.

According to a third aspect of the present invention, there is provided a base having a pillar and a winch in which a rope supporting device is arranged at a plurality of spaced locations on a bridge facility, and a guide rotatably connected to the pillar. An arm, and wherein the detection device is supported by a plurality of ropes extending from guide arms of the plurality of rope support devices.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a bridge inspection apparatus according to the present invention will be described with reference to an embodiment shown in the drawings. This inspection apparatus is arranged on the lower surface of a bridge 1 as shown in FIGS. A detection device 2 provided with a camera 4 on a balloon 3 and capable of floating in the air, and provided on both sides of the bridge 1 for movably holding the detection device 2 via ropes 14 connected to both sides. At least a pair of left and right rope support devices 6
a and 6b.

The detection device 2 includes a balloon 2 filled with a gas having a specific gravity lower than that of air such as helium gas, and the balloon 3
A high-performance compact and lightweight camera 4 provided at the upper part of the balloon and capable of rotating and swinging up and down by remote control, and a balancer 5 comprising a rod-shaped weight provided at the lower part of the balloon 2
And a buoyancy that is constantly rising. An image taken by the camera 4 is displayed on a monitor 10 of a base 8 of the rope support device 6.

The rope supporting devices 6a and 6b are
A pair of left and right movable bases 8 each having a winch 9 and the monitor 10 and the like disposed on the inside of the railing 7 on both sides of the bridge 1, and an upper part of the base 8 from the upper side of the railing 7 to the outward direction. Support arm 1 provided to project
1 and a guide arm 12 connected to the tip of the support arm 11 via a hinge 13 so as to be rotatable in the vertical direction.
In this embodiment, the guide arm 12 is bent by the hinge 13 of the support arm 11 so as to protrude from the outside of the railing 7 to the lower side of the bridge 1, and the lower end of the bridge is The length is set to reach the lower part of one digit.

A support arm 11 provided on the base 8 and a guide arm 12 rotatably connected to the tip of the support arm 11 are provided in a pair along the bridge axis. And a pair of front and rear ropes 14 simultaneously fed out of the winch 9 on the base 8 pass through the annular guide members 15 provided at predetermined intervals on the support arm 11 and the guide arm 12, respectively, and the leading end of the guide arm 12 Guided in the direction.

Therefore, the left and right rope supporting devices 6a, 6
b, two parallel ropes 14 are respectively guided from the front ends of the pair of front and rear guide arms 12 toward the lower surface of the bridge 1, and the front ends of these ropes 14 are connected to both sides of the detection device 2. Is a pair of front and rear ropes 14 on both sides
It is stably supported by the air.

When the detecting device 2 is moved, as shown in FIG. 2, the rope 1 of one of the rope supporting devices 6a is moved.
4 is pulled out by the winch 9, and the rope 14 is operated so that the rope 14 of the other rope supporting device 6 b is wound up by the winch 9.
Can move freely along the bridge width direction on the lower surface of the bridge.

As shown in FIG. 1, the bases 8 of the left and right rope supporting devices 6a and 6b disposed on both sides of the bridge 1 are moved by the same distance in the direction of the bridge axis along the rails 7 respectively. By doing so, the detection device 2 can be freely moved along the bridge axis direction on the lower surface of the bridge 1.

While moving the detecting device 2 along the bridge width direction, each of the winches 9 is operated to operate the rope 1.
When the tension of 4 is relaxed, as shown in FIG. 4, the detecting device 2 can be raised by the buoyancy of the balloon 3 and can enter the space between the girders. A part that is difficult to see from the underside of the girder, such as a connection point of the girder, can be photographed by the camera 4 and the image can be displayed on the monitor 10 of the base 8.

At this time, a camera 4 provided above the balloon 3
Is capable of performing a swing operation by remote control, so that it is possible to receive a field of view at almost all angles, and since the balancer 5 is provided below the balloon 3, the winch 9 is operated as described above. Even when the tension of the rope 14 is loosened, the balloon 3 does not rotate, and the camera 4 is always positioned above the balloon 3.

The operation for connecting the detecting device 2 to the left and right ropes 14 guided from both sides of the bridge 1 toward the lower surface of the bridge along the guide arm 12 is performed when an operator stands on the lower surface of the bridge 1. , The left and right ropes 14 are hung from both sides of the bridge 1 toward the lower surface of the bridge along the guide arm 12, and a worker waiting below the bridge connects the tips of the left and right ropes 14 to the detection device 2. Then, the winch 9 of each rope supporting device 6a, 6b is wound up.

When there is a river, a road, or the like on the lower surface of the bridge 1 and no worker can enter the lower surface of the bridge 1, the rope 14 suspended from one of the rope supporting devices 6a is used to control the helicopter by radio control. To the direction of the rope 14 suspended from the other rope support device 6a, and the detection device 2 is connected to the tips of both ropes 14.

FIG. 5 shows a second embodiment of the present invention. In this case, an inspection device includes a detection device 2 composed of a balloon 3 having a camera 4 and a detection device 4 which is separated from the bridge 4 on the bridge 1.
Rope support devices 6a, 6b, 6c fixedly arranged in two places
And 6d, and each of the rope support devices 6a, 6b, 6c and 6d has a base 8 and this base 8
The support 16 and the winch 9 erected on the top and the support 1
6 comprises a guide arm 12 rotatably connected via a hinge 13 to the upper end.

The rope supporting devices 6a, 6b, 6c and 6d
The guide arm 12 at the upper end of the support column 16 is bent by a hinge 13 so as to protrude downward from the outside of the railing 7 to the lower side of the bridge 1 in the same manner as in the first embodiment. A plurality of ropes 14 extending from the guide arm 12 are collected at one place on the lower side of the bridge 1, and the detection device 2 is connected to the tips of these ropes 14.

In the inspection device of this embodiment, as shown in FIG. 6A, rope support devices 6a,
Assuming that the lengths of the ropes 14 extended from the guide arms 12 of 6b, 6c and 6d are the same, the detecting device 2 is located at the center of the lower surface of the bridge 1 and the ropes of the rope supporting devices 6a and 6b as shown in FIG. When 14 is wound up with the same length,
The detection device 2 moves from the center of the lower surface of the bridge 1 along the bridge axis direction. Further, when only the rope 14 of the rope supporting device 6b is wound up as shown in FIG. 6C, the detecting device 2 moves to one side of the lower surface of the bridge 1. Therefore, by adjusting the length of the rope 14 of each rope supporting device in this way, the detecting device 2 can be three-dimensionally moved to an arbitrary position on the lower surface of the bridge 1.

FIGS. 7 and 8 show examples in which the inspection apparatus of the present invention is used in a method different from the methods shown in the first and second embodiments. FIG. 7 shows the first
The rope support device 6a shown in the embodiment of the present invention is disposed above the bridge 1 above the bridge 1 (within the bridge facility), and the guide arm 12 is projected upward by the hinge 13 so that the rope 14
, The base 8 is moved back and forth and right and left while the detection device 2 is positioned at a desired height below the bridge.

FIG. 8 shows a state in which the rope supporting devices 6a and 6b shown in the second embodiment are arranged on the bridge 1 so that the guide arm 12 at the upper end of the column 16 is directed upward by the hinge 13. The state in which the detection device 2 is brought close to each upper chord member of the truss bridge and inspected by projecting the rope 14 and extending the rope 14 is shown.

[0028]

As described above, in the bridge inspection device of the present invention, the guide arm 12 is rotatably connected to the upper ends of at least a pair of left and right rope support devices 6a and 6b provided in the bridge facility. Since the air-floating detection device 2 composed of a balloon 3 having a camera 4 is connected to the tip of a rope 14 guided along the guide arm 12, the guide arm is moved from the rope support devices 6 a and 6 b disposed on both sides of the bridge. The detection device 2 can be disposed on the lower surface of the bridge by projecting the detection device 2 toward the lower surface of the bridge.
Of the detecting device 2 by the winding and unwinding operation of the rope and the moving operation of the rope supporting devices 6a and 6b arranged on the bridge.
Can be freely moved in the front, rear, left and right directions on the lower surface of the bridge.

Further, since the guide arm 12 is rotatably connected to the upper ends of the rope supporting devices 6a and 6b, the guide arm 12 is rotated downward from both sides of the bridge as described above, and In addition to the inspection method of disposing the rope support device on the lower surface of the bridge, as shown in FIG. 7 and FIG. Check the underside,
It can also be used to inspect the upper chord of the truss bridge, and can be used for a wide range of applications.

Since the detection device 2 is composed of a balloon 3 having a camera 4 and capable of floating in the air, as in the first embodiment,
When the detection device 2 is arranged and used on the lower surface of a bridge, the ropes 14 connecting the both sides of the balloon 3 and the tips of the left and right guide arms 12 are wound up and unwound without loosening. Can always be moved at a constant height, and appropriate inspection can always be performed, and the detector 2 can be moved upward by loosening the rope 14 as necessary. Detailed inspection can be performed, and accurate inspection work can be expected.

Further, since the detection device 2 has buoyancy,
The load is not applied to the rope 14 and the rope itself can be made of a thin and lightweight material. As a result, the load on the rope support device is reduced and the entire device can be reduced in weight. In addition, there is an effect that handling management can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of a first embodiment of a bridge inspection device according to the present invention.

FIG. 2 is a sectional view showing the configuration of FIG. 1;

FIG. 3 is a side view of the inspection device as viewed from a side of a bridge.

FIG. 4 is a cross-sectional view of the same part as FIG. 2 showing a use state of the inspection device.

FIG. 5 is a perspective view showing the configuration of a second embodiment.

FIG. 6 is an explanatory diagram showing a use state of the inspection device according to the second embodiment.

FIG. 7 is an explanatory view showing another method of using the inspection device of the first embodiment.

FIG. 8 is an explanatory view showing another method of using the inspection device of the second embodiment.

[Explanation of symbols]

 1: Bridge 2: Detection device 3: Balloon 4: Camera 5: Balancer 6a, 6b, 6c, 6d: Rope support device 7: High rail 8: Base 9: Winch 10: Monitor 11: Support arm 12: Guide arm 13: Hinge 14: Rope 15: Annular guide member 16: Support

Claims (3)

[Claims] 1. A detection device capable of floating in the air having a camera at the top of a balloon and holding the detection device so as to be freely movable via ropes connected to both sides of the detection device. At least a pair of left and right rope support devices, the rope support device is connected to a winch-equipped base provided in a bridge facility, and is rotatably connected to the base so that the rope can extend vertically. Bridge inspection device with a guide arm. 2. A rope support device comprising: a winch-mounted base movably arranged on a bridge facility; and a pair of parallel guide arms rotatably connected to the base. 2. The bridge inspection device according to claim 1, wherein the left and right sides of the detection device are supported by a pair of parallel ropes extending from the parallel guide arms. 3. A rope support device comprising: a base having a support and a winch disposed at a plurality of spaced apart locations on a bridge facility; and a guide arm rotatably connected to the support. The bridge inspection device according to claim 1, wherein the detection device is supported by a plurality of ropes extending from guide arms of the plurality of rope support devices.