JPS6145197A - Duct cut-off device of television camera for inspecting buried duct - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a cable conduit inspection method in which a television camera is inserted into a buried conduit that accommodates and protects underground cables to inspect and observe the inside of the conduit. This invention relates to a pipe water stop device for television cameras.

[Conventional technology]

Conventionally, when inserting a cable into a buried conduit, the inside of the buried conduit was first inspected and observed, and the cable was buried after confirming that there were no abnormalities in the conduit. This inspection is carried out by inserting a television camera into the underground pipeline through a manhole at one end of the pipeline, and pulling the wires connected to the front and back of the television camera with a winch installed above ground. was moved inside the pipeline, and a television camera was used to photograph any intruding objects, misaligned connections, cracks in the inner wall, or damage to the pipeline, and the images were attached to the wires at the rear of the television camera. The inside of the pipeline was inspected and observed by projecting images onto a cathode ray tube installed on the ground via communication lines.

[Problem that the invention seeks to solve]

However, if there is muddy water in the pipeline, if you pull the TV camera with a wire as described above, it may be covered with muddy water or submerged in muddy water, causing the entire screen at that location to turn brown. The image becomes unclear and cannot be inspected.

[Means for solving problems]

Therefore, the present invention provides a first water stop device and a second water stop device made of gaskets that block the pipe in front and rear of a television camera moving in a buried pipe, and provides a water stop device between these water stop devices. In this system, a movable sealed chamber is formed within the pipe, and a drainage device is installed to drain the wastewater from the sealed chamber at any time. Furthermore, this drainage device can be used, for example, by injecting compressed air into the sealed chamber from the outside. However, the sewage inside the sealed room is discharged to the outside due to the pressure difference with the outside.

[Effect]

In addition to installing the water stop device of the present invention, the X area of the pipe inspection camera is sealed, making it difficult for sewage to enter this sealed room. Moreover, even if this sewage comes in, this sewage is discharged to the outside. Therefore, the photographing lens of the television camera is not contaminated with sewage, the inner wall of the pipe is not covered with dirty water, and the inner wall of the pipe can always be clearly photographed. Furthermore, when discharging the wastewater, compressed air is sent into the sealed chamber to increase the air pressure in the sealed chamber, and the wastewater in the sealed chamber can be instantly and easily discharged to the outside by a siphon phenomenon.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 is a conduit installed underground; 2 is a manhole provided at both ends of this conduit 1; 3 is a television camera inserted into the conduit 1 through the manhole 2 by connecting wires 4.5 to the front and back; 6; are guide sleds installed on all sides of this television camera 3, 7
numeral 8 is a winch around which one end of the wire 4 drawn out to the ground through one manhole 2 is wound; 8 is a winch around which one end of the wire 5 is drawn out through the other manhole 2 to the ground; 9 is a winch around which the wire 5 is wound, and 9 A cathode ray tube 9 is provided, and this cathode ray tube 9 displays the location photographed by the television camera 3 via a communication line connected to the television camera 3 at one end. 1° is the first water stop device provided between the front of the TV camera 3 and the wire 4, and 11 is the stop lK2 provided on the outer periphery of the cable clamp 12 provided between the other wire 5 and the TV camera. A water device, 13 is an air compressor installed on the ground, 14 has one end connected to this air compressor 13, the other end is connected to the above cable 5 via a hose drum 15, and connected to the second water stop device 11. It's a chinipu.

1 and 3 show a seventh water stop device 1o, 16 is a pipe body, 17 is several flanges provided at intervals on the outer periphery of this pipe body 16, and 18 is each of these flanges. 17 is a ring-shaped sponge fitted on the outer periphery of the ring-shaped sponge 17; 19 is a brim-shaped rubber gasket provided on the outer periphery of the tube body 16 between each of these flanges 17; the outer peripheral diameter of each of these rubber gaskets 19 is the same as that of the annular sponge 14; These outer circumferential diameters are slightly larger than the inner circumferential diameter of the pipe line 1. In addition, a fan-shaped pendulum is rotatably provided on the outer periphery of one end of the tube body 16, and 21 is a center hole passing through the center of the root of the pendulum, through which the tube body 16 is inserted. n is two annular metals provided on both sides of the inner circumference of this center hole B, and an annular groove is formed between the inner circumference of the center hole sandwiched between these two annular metals 22 and 22 and the outer circumference of the tube body 16. 2
1a is formed. B is a water absorption hole that reaches from the center of the arcuate edge of the pendulum to 21 m of the annular groove of the center hole 4;
Sae is a through hole bored in the outer periphery of the tube body 16 opposite to the annular groove 21a of the center hole 21 of this pendulum.
It communicates to the hollow part δ of No. 6. A locking hole 2 in which a cap-shaped portion is fixed to one end of the outer tubular body 16 of the swing lever m.
6a, I is a cap-shaped part fixed to the other end of the tubular body 16 and has a locking hole 27, and C is the inner periphery of the cap-shaped part of this fastener n and the locking hole 27m. It is a drainage hole that connects the

Figures ψ and 3 show the second water stop device 11, 4 is an inner tube that is placed over the outer periphery of the cable clamp 12, and 4 is an inner tube that is placed on the outer periphery of the inner tube 4, and one end of the water stop device 11 is shown. An outer circumferential tube having a flange (9) a, 31 a several flange provided at intervals on the outer periphery between the outer periphery tubes, 32 an annular sponge fitted on the outer periphery of this flange n, and 31 a flange 3Qa and each Outer tube between the collars 31 (9)
The outer circumferential diameter of each of these rubber seals is the same as the outer circumferential diameter of the annular sponge 32, and these outer circumferential diameters are slightly larger than the inner circumferential diameter of the conduit 1. .

U indicates each rubber gasket and each tsuba 31 from the outer surface of the tsuba 3Qa.
A long tube body that penetrates through and reaches the outer surface of the outer collar 31 is a tube connector provided on the outer surface of the collar 3Qa and connected to the open end of the long tube body, and the tube 14 is connected to this tube connector. There is. A is a fixing body that fixes the inner circumferential tube 4, outer circumferential tube 4, etc. to the outer periphery of the cable clamp 12.

In the case of this embodiment, the seventh water stop device 10 is connected to one end of the wire 4, the television camera 3 is connected to the rear of the first water stop device 10, and the television camera 3 is connected to the rear of the television camera 3. A first water stop device t, 11 is attached to the cable clamp 12.
, connect the wire 5 following the cable clamp 12 , insert these from one end of the conduit 1 , and connect the winch 7 to the cable clamp 12 .
The television camera 3 is moved from one end of the conduit 1 to the other end while winding up the wire 4. This TV camera 3
This is to photograph the inner wall of conduit 1, but! /'s water stop device 10 and second water stop device 11 are rubber gaskets 1
9 and O, since the annular sponge 18 and its outer diameter are slightly larger than the inner diameter of the conduit 1, the conduit 1 is blocked.

Therefore, between the first water stop device 10 and the second water stop device 11, a sealed chamber containing the television camera 3 is formed. Therefore, when this sealed chamber is moved through a place in the conduit 1 where sewage has accumulated, it is difficult for sewage to enter the sealed chamber a. Therefore, depending on the amount of sewage, it is possible to clearly photograph the inner wall of the conduit 1 in the sealed chamber 37. However, when the amount of sewage is large, when moving the sealed room y, the rubber gaskets of the water stop device 10 and 11 Sewage enters the sealed chamber a from 19 and its outer periphery. In this case, in conduit 1,
A television camera is stopped at a location desired to be photographed, and compressed air is sent from an air compressor 13 on the ground into a sealed chamber 37 via a tube 14, a tube connector 5, and a long pipe body. On the other hand, the shaker provided in the first water stop device 10 is the pipe body 1.
Since it is rotatably provided in the water absorption hole 6 and always hangs downward due to its own weight, the lower opening of the water absorption hole B is always located at the lower part of the conduit 1 of the sealed chamber a. Therefore, when compressed air is sent into the sealed chamber 37 as described above and the sealed chamber M is filled with compressed air, the air pressure inside the sealed chamber 37 increases,
A pressure difference occurs between the outside of the sealed room n, and the sewage inside the sealed room r flows through the oscillating water absorption hole n, the annular groove 21a, the through hole row, and the hollow part 5.
The water is immediately drained into the conduit 1 in the sealed chamber 37 through the drain hole. In this case, all of the waste water in the sealed chamber 37 is drained out due to the siphon action, regardless of its amount.

Also, the wire 4 is pulled inside the conduit 1, and the TV camera 3 is
When moving the seventh water stop device 10 etc., the wire 4
Due to the torsion of the tube body 16, the pipe body 16 rotates within the conduit 1, and as a result, the row of through holes in the tube body 16 is also positioned upwardly or laterally. However, in this embodiment, as described above (the pendulum is always positioned downward due to its own weight, and the pendulum (9)
One end of the water suction hole A faces the annular groove 21a, and the row of through holes in the tube body 16 faces the annular groove 21a at any position. 16 and is discharged to the outside of the first water stop device 10.

In this embodiment, the drainage device for the waste water in the closed room r is based on the siphon action as described above, but the present invention is not limited to this, and any suitable drainage device may be provided.

〔Effect of the invention〕

In this invention, even if sewage accumulates in the pipe line 1, the TV camera 3 is placed inside the closed room, so that it is difficult for sewage to enter the closed room, and the inside of the pipe line It is possible to clearly photograph the condition of the inner wall of the building. Also, for example, this closed room 37
Even if sewage enters the room, it can be immediately and easily removed from the closed room.
Drainage can be carried out outside. Therefore, the sewage inside the pipe line 1 can be always blocked and the inner wall inside the pipe line 1 can be clearly imaged, thereby increasing the work efficiency of the pipe line inspection work.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the state of use of the present invention, Fig. 2 is a sectional front view of a seventh water stop device of the invention, Fig. 3 is a sectional view of the point A- in Fig. 1, ψ diagram is a cross-sectional front view of the second water stop device of this invention, FIG. 5 is a left side view of the same, and FIG. 6 is a cross-sectional factor showing the usage state of this invention.

Claims (2)

[Claims] (1) In a TV camera for underground pipe inspection, in which a TV camera is inserted into the pipe and the TV camera is moved within the pipe using wires connected to the front and rear of the TV camera to photograph the inside of the pipe. , a first water stop device and a second water stop device consisting of packing to block the pipe are installed on the wires in front and behind the TV camera, and between these two water stop devices, the inside of the pipe is 1. A pipe water stop device, characterized in that a movable sealed chamber is formed with a drainage device for draining wastewater from the sealed chamber at any time. (2) The drainage device is provided with a pipe body in one of the water stop devices that sends compressed air from the outside into the sealed chamber, and a drain pipe that discharges sewage in the sealed chamber to the outside through the other water stop device. Claims (1) characterized in that
) Pipe water stop device for TV camera for inspection inside buried pipes.