JP2001020224A - Inspection device for under face of elevated structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with traffic regulation of cars on an elevated construction during inspection by using a compact and lightweight inspection device by which locations invisible from below can be inspected. SOLUTION: This device used when the under face of an elevated structure is inspected from the upper carriageway of the elevated structure, is provided with a truck 2 transferable on the upper carriageway, a base arm 3 protrusively provided on the truck to horizontally extend, an arm 7 vertically stretched downward and supported to be vertically movable and rotatable around the vertical axial line at the tip of the base arm 3, a means 4 mounted on the truck 2 to move up and down the arm 7, a horizontal arm 8 fixed to the lower end of the arm 7 at the middle part, an intrusion arm 15 fixed to the tip of the horizontal arm 8 at the lower end and stretched upward, a TV camera 18 installed at the upper end of the intrusion arm 15 through an oscillating means 17, a weight 19 fixed to the rear end of the horizontal arm 8 to horizontally balance the horizontal arm 8, and an image display 5 installed on the truck 2 to display images taken by the TV camera 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to the rust of steel on the lower surface of elevated structures such as various bridges, elevated railways and urban expressways.
Regarding the lower surface inspection device used when performing inspection of peeling of paint, cracking of concrete floor panel etc. from the upper passage of the elevated structure, particularly from the side and below hidden under the girder member on the lower surface of the elevated structure The present invention relates to a lower surface inspection device suitable for use when inspecting an unsightly place.

[0002]

2. Description of the Related Art In the conventional monitoring and inspection work of an elevated structure as described above, for example, when the lower surface of a bridge is targeted,
If the location to be inspected on the underside is a place that can be seen from the side or from below, perform a visual inspection from an appropriate place such as under a bridge close to the bridge, and if there is no suitable place near the bridge Was inspected using a telescope, but if the area to be inspected on the underside is hidden by the girder member and cannot be seen from the side or from below, scaffold it at an appropriate place such as under a bridge, Workers were checking on the scaffold. However, the use of a scaffold in this way requires a time for assembling the scaffold in addition to the inspection work time, which raises a problem that the cost increases, and when the scaffold is to be pumped up to a high position, There is also a problem that the inspection work involves danger.

[0003] In order to avoid the above-mentioned danger and improve the working efficiency, in recent years, for example, as disclosed in Japanese Utility Model Laid-Open Publication No. 63-031110, the arm of a crane device of a relatively large crane truck has been developed. A vehicle-integrated underside inspection device with a movable bucket installed at the tip end will be used.For example, when the vehicle-integrated underside inspection device is used to inspect the lower surface of a bridge, the upper portion of the bridge will be used. A crane truck is placed in the aisle, and with the worker on the movable bucket, the arm of the crane device is set out from the side of the bridge to move the movable bucket under the bridge, and the worker on the movable bucket Visual inspection. However, with a bottom inspection device of a type in which an operator gets into such a movable bucket, although the working efficiency can be improved compared to a visual inspection from under a bridge or an inspection work with a scaffold, the crane device used is usually hydraulic. Since it is driven, a hydraulic pump or the like is required, so that the entire lower surface inspection device becomes large, and the operability of the movable bucket is not sufficiently good for inspection of a bridge.

Moreover, in general, a crane device has a plurality of fixed-length arms bent or rotated at a joint portion, and in order to operate the crane device, a work space that does not hinder the movement of each of the arms. It is not suitable for use in narrow spaces where there are obstacles around. In addition, since the worker gets into the movable bucket installed at the tip of the arm with a very long cantilever support structure and performs inspection work, the bending moment applied to the arm becomes extremely large, and in order to support this The size of the crane device and, consequently, the size of the vehicle on which it is mounted (the crane vehicle) are increased, and this has necessitated the restriction of vehicles on elevated structures such as bridges in order to secure a work space for the vehicle, causing traffic obstacles. There is also a problem that.

[0005]

For this reason, conventionally, for example, as described in Japanese Patent Application Laid-Open No. 02-202318, the distal end of an extendable base arm mounted horizontally on a small truck so as to be able to ascend and descend is provided. Also connect the upper end of the telescopic hanging arm with the joint, and to the lower end of the hanging arm,
A lower surface inspection device has been proposed to reduce the size and weight by mounting a television camera obliquely upward instead of a movable bucket on which an operator rides, but such a lower surface inspection device requires a small work space. Although vehicle regulations on elevated structures are unnecessary, if the location to be inspected on the underside of the elevated structure is a recessed part that is hidden by the girder member and can not be seen from the side or from below, the above diagonally upward TV camera There is a problem that the inspection cannot be performed because the image capturing range and eventually the screen of the image display device on the cart are not entered.

In order to solve this problem, a horizontal arm extending to the center of the lower surface of an elevated structure like a conventional device is added to the lower end of the hanging arm of the miniaturized bottom inspection device by cantilever support. Then, there is a problem that the bending moment applied to the hanging arm increases, and the entire bottom surface inspection device becomes large in size to support the bending arm, which is contrary to the original purpose. In addition, even if a TV camera is installed at the tip of the horizontal arm, it is still impossible to take an image of a recessed portion that cannot be seen through from below because it is blocked by a flange portion of an I-shaped steel material constituting a girder member, so that inspection cannot be performed. there were.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus which advantageously solves the above-mentioned problems, and an undersurface inspection apparatus for an elevated structure according to the present invention comprises: An inspection device used when inspecting a lower surface of an elevated structure from an upper passage of the elevated structure, a trolley movable on the upper passage, and a base protruding from the trolley and extending in a horizontal direction. An arm, a vertically extending hanging arm supported on the distal end of the base arm and rotatably about a vertical axis, and a hanging arm lifting means provided on the carriage for raising and lowering the hanging arm A horizontal arm having a middle portion fixed to a lower end portion of the hanging arm and extending in the horizontal direction, a entering arm having a lower end portion fixed to a tip end of the horizontal arm and extending upward, A television camera mounted on the upper end of the built-in arm via a remote control type swinging means, a weight fixed to the rear end of the horizontal arm to balance the horizontal arm horizontally, and provided on the carriage. Image display means for displaying an image captured by the television camera based on an image signal from the television camera.

In the undersurface inspection apparatus for an elevated structure according to the present invention, first, the horizontal arm is arranged in parallel with the side of the elevated structure, and the bogie is positioned adjacent to the side of the elevated structure. In this way, the hanging arm supported at the tip of the base arm, the horizontal arm fixed to the lower end of the hanging arm, and the entry arm supported at the tip of the horizontal arm are located closer to the side of the elevated structure than the side of the elevated structure. Located outside,
Then, the hanging arm is lowered by the hanging arm lifting / lowering means provided on the bogie, thereby lowering the horizontal arm and the entering arm supported by the tip of the horizontal arm, thereby attaching the horizontal arm to the upper end of the entering arm. The lowered television camera is lowered to a position lower than the lower end of the elevated structure, and then the hanging arm is rotated with respect to the base arm, so that the television camera is wrapped under the elevated structure to form an elevated structure. The lower surface of the object is imaged by the television camera, and based on the image signal from the television camera, the image captured by the television camera is displayed on image display means provided on the carriage, thereby inspecting the lower surface of the elevated structure. I do.

[0009] At the time of the inspection, if a recessed portion, which is made up of a girder member of an elevated structure and is obstructed by, for example, a flange portion of an I-shaped steel member and cannot be seen from below, the hanging arm lifting / lowering means provided on the bogie. By raising the hanging arm, the upper end of the entering arm supported by the tip of the horizontal arm is inserted into the inside of the I-shaped steel material, and the image is taken by appropriately setting the direction of the television camera by the swinging means. , Check. In addition, at the time of such an inspection, the weight fixed to the rear end of the horizontal arm balances the horizontal arm, so that no bending moment is applied to the hanging arm and work is performed on the tip of the horizontal arm. No worker gets on the horizontal arm to add the weight of the worker.

Therefore, according to the underside inspection apparatus for an elevated structure of the present invention, it is possible to inspect the recessed portion which cannot be seen from below the underside of the elevated structure without danger and efficiently, and to perform the inspection efficiently without danger. Since the arms do not require high strength, they can be made simple and lightweight, and the hanging arm support at the tip of the base arm simply supports the hanging arm so that it can move up and down and rotate. Together with what is needed,
Since the base arm and the bogie, and thus the entire inspection device, can be made lightweight and compact, there is no need to regulate vehicles on elevated structures to secure a work space during inspection work. The occurrence of traffic obstacles can also be avoided.

In the undersurface inspection device of the present invention, at least one of the hanging arm and the horizontal arm may include a plurality of pipes which are separably connected to each other. By separating these pipes, the hanging arm or horizontal arm can be divided and compacted, so that the bogie moves before and after the inspection work on the upper passage of the elevated structure to be inspected, and the lower surface The inspection device can be easily transported onto the upper passage or removed therefrom.

Further, the undersurface inspection device of the present invention may further include a recording device for recording an image signal from the television camera, and according to this configuration, inspection of the undersurface of the elevated structure at the inspection work site. When the inspection is performed, the inspection result is recorded as an image, and analysis and confirmation can be performed later. Note that the recording device may be integrated with the television camera, or may be mounted on a carriage separately from the television camera.

Further, in the undersurface inspection device according to the present invention, the hanging arm elevating means may include a winch for winding and unwinding a wire rope connected to the hanging arm. If, for example, the hanging arm elevating means can be configured simply and lightly,
The entire inspection device can be made lighter and more compact. The winch may be of an electric type, but may be of a manual type.

In the undersurface inspection device according to the present invention, the swinging means may be remotely controlled by a controller provided on the cart. According to such a configuration, the television cameras can be moved one by one on the upper passage. It is possible to change the direction of the TV camera at any time during the inspection work and turn it in any direction without having to pull it up and change its orientation, so that the inspection work on the underside of the elevated structure can be performed more efficiently. it can.

In the case where the controller is provided, for example, the swing means is a support mechanism capable of changing the direction of the television camera support portion up, down, left, right, etc. by using a universal joint or the like, As a mechanical type having a manually operated lever or handle, the lever or handle is connected to the TV camera support via a plurality of wire ropes or rods, and the TV camera support is connected to the lever or handle. It may be mechanically linked to the steering wheel, and the direction of the TV camera support is changed to up, down, left, right, etc. by driving the swinging means with a plurality of motors like an electric mirror for automobiles In addition to a possible support mechanism, the controller is an electric type having a switch, a variable resistor, a rotary encoder, etc. , It may be to change the orientation of the television camera supporting unit by electrically controlling the operation of the plurality of motors by the switch or the like.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Here, FIG. 1 is a side view showing an embodiment of an undersurface inspection device for an elevated structure according to the present invention in a state of an inspection operation, and FIGS. 2A and 2B are a bottom surface inspection device of the embodiment. Front view and side view showing the state in which the hanging arm is raised and divided.
FIG. 3 is a perspective view showing a part of a bogie and a hanging arm of the lower surface inspection device of the embodiment, and FIG. 4 is an exploded perspective view showing a hanging arm, a horizontal arm and a entering arm of the lower surface inspection device of the embodiment. In the figure, reference numeral 1 denotes an elevated structure (shown in a cross section in FIG. 1) to be inspected on the lower surface, and 2 denotes a truck of the lower surface inspection device of the embodiment.

As is apparent from FIG. 3, the bogie 2 of the apparatus of this embodiment has an elevated structure at four corners at the lower end of a frame 2c formed by combining a plurality of square pipes 2a and plate members 2b. A caster (wheel that can freely change direction) 2d is attached so as to be able to move by hand on the upper passage 1a of the vehicle 1 and a plurality of square pipes 3a are formed on the upper part of the truck 2. The base arm 3 protrudes integrally with the carriage 2 so as to extend in the horizontal direction. At the distal end of the base arm 3, a plurality (two in the illustrated example) of substantially cylindrical hanging arm receiving members 3b are fixed in a vertically aligned manner.

The carriage 2 has a manual winch 4 as a hanging arm elevating means and a video deck integrated display (image display) device 5 as an image signal processing means.
And an electric controller 6 having a switch, a variable resistor, and the like for controlling the operation of a television camera, which will be described later, A battery or an engine-type generator (not shown) may be mounted as a power source for supplying power to the display device 5, the electric swing mechanism, and the television camera. When an engine-type generator is installed as a power source, the engine-type generator is lowered from the carriage 2 to the upper passage 1a of the elevated structure 1 when the lower surface of the elevated structure is inspected, and is operated. It is possible to prevent the vibration of the engine-type generator from being transmitted to the television camera and making the image unclear. Further, the power may be supplied from an automobile stopped on the upper passage 1a adjacent to the bogie 2. If the elevated structure 1 itself is provided with a power line, the power line may be supplied. You may use it.

As shown in FIGS. 1 to 3, a hanging arm 7 is inserted through the hanging arm receiving member 3b, whereby the hanging arm 7 extends substantially vertically. As shown in FIG.
The middle part near the rear end is fixed at a right angle via a bracket 9, whereby the horizontal arm 8 extends substantially horizontally.

As shown in FIG. 1, the hanging arm 7 includes a plurality of pipes (four relatively long pipes 7a and one relatively short pipe 7b at the lower end in the figure). As with the end of the horizontal arm 8 shown in FIG.
Each pipe 7 except the pipe 7a at the upper end of the hanging arm 7
At the upper end of a, 7b, a mating projection 10 with a U-shaped notch
And a pipe 7b at the lower end of the hanging arm 7.
In the lower end of each pipe 7a except for the above, a fitting plate 11 that can be fitted with the above-mentioned notch is fixedly provided, and further, each of the pipes 7a and 7b except the lower end of the pipe 7b at the lower end of the hanging arm 7 is provided. At the end, a screw hole 7c is formed in a direction perpendicular to the axis so as to penetrate the fitting protrusion 10 and the fitting plate 11. As a result, the five pipes 7a and 7b are fitted with the fitting protrusion 10 at the upper end of the pipe into the lower end of the other pipe.
The fitting plate 11 is fitted into the notch 10 and the set screw 12 is screwed into the screw hole 7c at the end of the pipe. Have been.

Further, the horizontal arm 8 here is the same as that shown in FIG.
4 and 4, a plurality of pipes (four long pipes 8a in the figure) are provided, and like the hanging arm 7, as shown in FIG. Except for the pipe 8a at the right end in FIG. 1, a fitting projection 10 having a U-shaped notch is fixedly provided at the front end of each pipe 8a, and the pipe 8a at the rear end of the horizontal arm 8 is fixed. Excluding each pipe 8a
In the rear end portion, a fitting plate 11 capable of fitting with the cutout portion is fixedly provided. However, a screw hole for a set screw as in the case of the hanging arm 7 is not formed in each pipe 8a. Thereby, in the four pipes 8a, the fitting projection 10 at the front end of the pipe is fitted into the rear end of the other pipe, and the fitting plate 11 is fitted into the notch of the fitting projection 10. , Are detachably connected to each other and are prevented from rotating.

As shown in FIG. 4, a rod-shaped member 13 is fixed to the pipe 7b at the lower end of the hanging arm 7 via a connecting member in a direction perpendicular to the pipe 7b and also perpendicular to the horizontal arm 8. The two end portions of the rod-shaped member 13 and the two side portions of the pipe 8a at the end of the horizontal arm 8 are also provided with two support rods 14, which can also be divided into three pipes 14a by removing the set screw 12, respectively. These are connected via set screws 12 at both ends of the support rods 14, whereby a triangular frame structure is formed here, and a television camera and an electric motor (described later) added to the distal end of the horizontal arm 8. The bending moment due to the weight of the swinging mechanism is prevented from being directly applied to the connecting portion between the hanging arm 7 and the horizontal arm 8 and the connecting portion between the ends of the pipes 8a of the horizontal arm 8. Horizontal by the load arm 8
So that a compressive force in the axial direction is applied to each pipe 8a.
Are connected to each other.

Since the rod-shaped member 13 is fixed to the side of the pipe 7b at the lower end of the hanging arm 7 via the connecting member as described above, the pipe 7b at the lower end can be raised and lowered. In this case, each of the hanging arm receiving members 3b is provided with a cut in a part of its circumference and has a substantially C-shaped cross section. The pipe 7b at the lower end of the hanging arm 7 is lowered from the height of the base arm 3 without being hindered by the hanging arm receiving member 3b by passing the connecting member through the base arm 3 as shown in FIG. 3 can be raised.

Each of the hanging arm receiving members 3b has a double structure of an outer member and an inner member each having a substantially C-shaped cross section. In addition to being elastically deformable, the outer member surrounds and firmly holds the inner member, and here, penetrates the outer member and the square pipe 3a at the distal end of the base arm 3. A screw hole is formed, and FIG.
As shown in FIG. 3, a screw member 3c is screwed into the screw hole, and a lock handle 3d is provided at a rear end portion of the screw member 3c to form a friction lock mechanism for preventing the hanging arm from rotating. .

According to such a friction lock mechanism,
When the operator operates the lock handle 3d to screw the screw member 3c, the inner member is pressed against the outer peripheral surface of the hanging arm 7, and under normal operating conditions, the hanging of the hanging arm 7 and the horizontal arm 8 is performed. The direction around the vertical axis passing through the center of the arm receiving member 3b can be fixed at an arbitrary position, and by operating the lock handle 3d to loosen the screw member 3c and retreat, the inner member can be fixed. It is restored by the elastic force and gently slidably comes into contact with the outer peripheral surface of the hanging arm 7 to arbitrarily change the orientation of the hanging arm 7 and the horizontal arm 8 around the vertical axis passing through the center of the hanging arm receiving member 3b. On the other hand, when an unexpected external force is applied to the horizontal arm 8 due to gusts or the like and an excessive turning torque is generated in the hanging arm 7, the screw member 3c is screwed in by operating the lock handle 3d. Even in this state, the slide between the inner member and the outer peripheral surface of the hanging arm 7 allows the hanging arm 7 to rotate around the vertical axis, and the bogie 2 is dragged by the horizontal arm 8 to rotate around. Can be prevented.

Further, a penetrating arm 15 is fixed to the tip (right end in FIG. 1) of the horizontal arm 8 so as to extend substantially perpendicular to the horizontal arm 8. 15 as well as the support rod 14,
In this case, the lower end of the pipe 15a at the lower end of the entry arm 15 and the lower end of the support rod 16 having the upper end fixed to the pipe 15a are configured. Is inserted into the pipe 8a from the hole on the upper surface of the pipe 8a at the distal end of the horizontal arm 8 and is fixed to the pipe 8a with a set screw 12, whereby a triangular frame structure is formed. The bending moment due to the weight of the television camera and the electric swing mechanism, which will be described later, applied to the distal end portion is prevented from being directly applied to the connecting portion between the entering arm 15 and the horizontal arm 8.

Then, at the upper end of the entering arm 15,
A normal small-sized television camera 18 with a zoom function is mounted via an electric swing mechanism 17, and the electric swing mechanism 17 here incorporates two motors. The operation of these motors controlled by the formula controller 6 allows the television camera 18 to rotate by any angle around the horizontal axis H and the vertical axis V, as indicated by the arrows in FIG. The television camera 18 in can output the photographed image as an image signal to the above-described display device 5 so that the display device 5 can display and record the screen.

The electric controller 6 serves as a photographing direction display means for making the operator easily understand the current direction of the television camera 18, for example, an electric swing mechanism.
17 and a control knob imitating the outer shape of the television camera, and controls the operation of the electric swing mechanism 17 by, for example, digital proportional control or the like so that the direction of the control knob matches the actual direction of the television camera 18. Alternatively, a normal control knob may be simply provided, and a scale or the like of the controller 6 may be provided with a scale so that the rotation angle can be easily understood. The shooting direction display means may display the current direction of the television camera 18 on the display device 5 as a symbol.
Alternatively, a plurality of light sources, such as LEDs, may be selectively lit to indicate the current orientation of the television camera 18 by its lit position.

Further, a weight 19 is fixed to the rear end (the left end in FIG. 1) of the horizontal arm 8, and the weight of the weight 19 is determined by the joint between the hanging arm 7 and the horizontal arm 8. 8, the moment applied to the horizontal arm 8 due to the weight of the portion and the weight of the weight 19 at the rear end side portion of the horizontal arm 8 from the joint between the hanging arm 7 and the horizontal arm 8 to the front end portion of the horizontal arm 8 The weight of the part, the entering arm 15 and the support rod 16, and the weight of the television camera 18 and the electric swing mechanism 17 substantially balance the moment applied to the horizontal arm 8 and adjust the horizontal arm 8 to be substantially horizontally balanced. Have been. In this embodiment, as shown in FIG. 3, a weight 20 is also fixed to the carriage 2, and the weight 20 balances the weight of the hanging arm 7 itself and the weight of the horizontal arm 8 and the like added thereto. In this case, the cart 2 is prevented from falling down.

In addition, in the lower surface inspection device of this embodiment,
Wire rope at the joint between the hanging arm 7 and the horizontal arm 8
One end of the wire rope 21 is connected to the other end of the wire rope 21, and the other end of the wire rope 21 is connected to the drum of the above-mentioned manual winch 4, whereby the manual winch 4 is operated to rotate the drum in a predetermined direction. When it is moved, the wire rope 21 is wound up and the hanging arm 7 is raised to the position shown in FIG. 2, and when the drum is rotated in the opposite direction, the wire rope 21 is wound.
21 is extended, and the hanging arm 7 descends as shown in FIG.

In the lower surface inspection device of this embodiment, as shown in FIG.
First, as shown in FIG.
And the truck 2 is placed in parallel with the side of
And the horizontal arm 8 fixed to the lower end of the hanging arm 7 and the horizontal arm 8 fixed to the lower end of the hanging arm 7. Is positioned outside the side of the elevated structure 1 and then the wire rope 21 is fed out by operating the manual winch 4 provided on the carriage 2 while adding the pipe 7a upward. By lowering the hanging arm 7, the horizontal arm 8 and the entering arm 15 are lowered, and the television camera 18 mounted on the upper end of the entering arm 15 is lowered to a position lower than the lower end of the elevated structure 1. Then, by grasping the hanging arm 7 by hand and rotating the hanging arm 7 with respect to the base arm 3, FIG.
As shown in the figure, the television camera 18 is turned under the elevated structure 1 and the lower surface of the elevated structure 1 is moved to the television camera 18.
Then, based on the image signal from the television camera 18, the image taken by the television camera 18 is displayed on the display device 5 provided on the carriage 2, whereby the lower surface of the elevated structure 1 is inspected.

At the time of the inspection, a recessed portion which is not visible from below because it is blocked by, for example, the flange portion 1c of the I-shaped steel member 1b constituting the girder member of the elevated structure 1 is provided on the carriage 2. Operate the manual winch 4 to suspend the arm 7
To raise the upper end of the entry arm 15 supported by the tip of the horizontal arm 8 as shown in FIG.
While being inserted into the inside of the shaped steel member 1b, the electric controller 6 is operated and the direction of the television camera 18 is appropriately set by the electric swing mechanism 17, whereby an image is taken as shown by an arrow in FIG. be able to. In addition, since the weight 19 fixed to the rear end of the horizontal arm 8 balances the horizontal arm 8 at the time of such inspection, no bending moment is applied to the hanging arm 7 and the horizontal arm 8 A worker rides on the tip of the
The weight of the worker is not added to the weight. After the inspection work is completed, if the hanging arm 7 is disassembled in order from the top while being lifted in the reverse procedure, the lower surface inspection device of this embodiment can be easily withdrawn.

Therefore, according to the lower surface inspection device of this embodiment, it is possible to inspect the recessed portion that cannot be seen from below the underside of the elevated structure 1 without danger and efficiently, and also the hanging arm 7 and the horizontal arm 8 does not require high strength, the arms can be made simple and lightweight, and the hanging arm receiving member 3b at the tip of the base arm 3 only supports the hanging arm 7 so as to be able to move up and down and rotate. In combination with the fact that a simple and lightweight device is sufficient, the base arm 3 and the trolley 2 and thus the entire inspection device can be made lightweight and compact, and therefore, a sufficient work space can be secured during the inspection work. Elevated structure 1 for
Since there is no need to regulate the above vehicles, it is possible to avoid the occurrence of traffic obstacles.

Further, according to the bottom surface inspection apparatus of this embodiment, since the hanging arm 7, the horizontal arm 8, and the entrance arm 15 each have a plurality of pipes which are separably connected to each other, By separating a plurality of pipes, the hanging arm 7, the horizontal arm 8, and the entering arm 15 can be divided and compacted, respectively.
To easily move the carriage 2 before and after the inspection work on the upper passage 1a of the elevated structure 1 for performing the inspection work, and to transport the lower surface inspection device onto the upper passage 1a and to remove the lower inspection device therefrom. Can be.

Further, according to the bottom surface inspection apparatus of this embodiment, since the video deck as a recording device for recording the image signal from the television camera 18 is integrally provided with the display device 5, the inspection work site is elevated. When the lower surface of the structure 1 is inspected, the inspection result is recorded as an image, and can be analyzed and confirmed later.

Further, according to the lower surface inspection device of this embodiment, since the manual winch 4 for winding and unwinding the wire rope 21 connected to the hanging arm 7 is provided as the hanging arm lifting / lowering means, The arm elevating means can be configured simply and lightly, and the entire inspection device can be made lighter and more compact.

According to the lower surface inspection apparatus of this embodiment, since the swing mechanism 17 is electrically driven by the controller 6 provided on the carriage 2, the television cameras 18 are moved one by one to the upper passage. Even if the direction of the TV camera 18 can be changed at any time during the inspection work without turning it up and changing its direction, the TV camera 18 can be directed to an arbitrary direction, so that the inspection work on the lower surface of the elevated structure 1 can be performed more efficiently. It can be carried out.

Although the present invention has been described with reference to the illustrated examples, the present invention is not limited to the above examples. For example, the hanging arm lifting / lowering means may be an electric winch, or a rack provided on the side surface of the hanging arm. A mechanism driven by a pinion may be used. Further, the recording device may be a portable type integrated with the television camera, and in that case, the controller on the carriage may be operated together with the swinging means. The swinging means is supported by using a universal joint or the like, which is mechanically driven from a controller having a manually operated lever or handle via a wire or a rod like a bicycle brake device to swing. A mechanism may be used, and the bogie may be a self-propelled one using a motor or the like.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of an undersurface inspection apparatus for an elevated structure according to the present invention in an inspection operation.

FIGS. 2 (a) and (b) are a front view and a side view showing the undersurface inspection device of the above embodiment in a state where a hanging arm is lifted and divided.

FIG. 3 is a perspective view showing a part of a bogie and a hanging arm of the lower surface inspection device of the embodiment.

FIG. 4 is an exploded perspective view showing a hanging arm, a horizontal arm, and a entering arm of the lower surface inspection device of the embodiment.

FIG. 5 is an exploded perspective view showing a connecting portion of pipes constituting a horizontal arm of the lower surface inspection device of the embodiment.

FIG. 6 is a perspective view showing a swing mechanism and a television camera of the lower surface inspection device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevated structure 1a Upper passage 1b I-shaped steel material 1c Flange part 2 Dolly 3 Base arm 3b Hanging arm receiving material 4 Manual winch 5 Video deck integrated display device 6 Electric controller 7 Hanging arm 7a, 7b, 8a, 15a Pipe 8 Horizontal arm 15 Entrance arm 17 Electric swing mechanism 18 TV camera 19, 20 Weight 21 Wire rope

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsushi Hayashi 1-3-11 Takinogawa, Kita-ku, Tokyo Inside Kawada Industries Co., Ltd. (72) Mitsuo Iso Iso 1-7-1, Akabaneishi, Kita-ku, Tokyo Bridge maintenance F term (reference) 2D059 BB37 EE03 EE05 EE08 GG39

Claims (5)

[Claims] 1. A lower surface inspection device used for inspecting a lower surface of an elevated structure (1) from an upper passage of the elevated structure, a trolley (2) movable on the upper passage, and the trolley. A base arm (3) protruding from the base arm and extending in the horizontal direction; and a hanging arm (7) vertically supported and supported on the distal end of the base arm so as to be liftable and rotatable around a vertical axis. A hanging arm elevating / lowering means (4) provided on the bogie to elevate and lower the hanging arm; a horizontal arm (8) having a middle portion fixed to a lower end of the hanging arm and extending in a horizontal direction; A penetrating arm (15) having a lower end fixed to the distal end of the horizontal arm and extending upward, a television camera (18) attached to the upper end of the penetrating arm via a swing means (17), At the rear end of the horizontal arm A weight (19) that is set to horizontally balance the horizontal arm, and an image display means (5) provided on the carriage and displaying an image captured by the television camera based on an image signal from the television camera; An undersurface inspection device for an elevated structure, comprising: 2. At least one of said hanging arm and said horizontal arm (7, 8) comprises a plurality of pipes (7a, 7b, 8a) separably connected to each other. Item 2. A lower surface inspection device for an elevated structure according to Item 1. 3. A recording device (5) for recording an image signal from the television camera, further comprising:
An undersurface inspection device for an elevated structure according to claim 1 or 2. 4. The hanging arm raising / lowering means according to claim 1, further comprising a winch (4) for winding and unwinding a wire (21) connected to the hanging arm. The undersurface inspection device for an elevated structure according to any one of the above. 5. The elevated structure according to claim 1, wherein the swinging means is remotely controlled by a controller (6) provided on the bogie. Underside inspection device.