JPH0426421B2 - - Google Patents

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 conduit through a manhole at one end of the conduit, and pulling the wires connected to the front and back of the television camera with a winch installed above ground. A television camera is moved inside the pipeline to take pictures of any objects that have entered the pipeline, misaligned connections, cracks in the inner wall, and any damaged areas. The inside of the pipeline was inspected and observed by projecting images onto a cathode ray tube installed on the ground via a communication line.

[Problem that the invention seeks to solve]

However, if there is sewage in the pipes,
When a television camera is stretched with a wire as described above, it is exposed to dirty water or submerged in dirty water, and the entire screen at that point becomes brown and opaque, making it impossible to inspect.

[Means for Solving the Problems] Therefore, the present invention provides a first water stop device and a second water stop device comprising packing for blocking the pipe in front and rear of a television camera moving in the buried pipe. A sealed chamber that is movable within the pipe is formed between these water stop devices, and a drainage device is provided to drain the wastewater from the sealed chamber at any time. In this drainage device, one of the water stop devices is provided with a pipe body that sends compressed air from the outside to the sealed room, and the other water stop device is provided with a pipe body that drains sewage from the sealed room to the outside. A hole communicating with the hollow part of the tube is bored on the outer periphery of the closed end of the tube protruding into the sealed chamber, and one end of the pendulum is rotatably suspended from the outer periphery of the tube so as to cover this hole. A water absorption hole is bored from the lower end of the pendulum to an annular groove provided on the inner periphery of the pendulum that is in contact with the outer periphery of the tube having the hole.

[Effect]

By providing the water stop device of the present invention, the area around the television camera for inspecting pipes is sealed, making it difficult for dirty water to enter the sealed chamber. 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, and the inner walls of the pipes are not covered with sewage.
The inside of the pipe can always be clearly photographed. In addition, when discharging the wastewater, compressed air is sent into the sealed chamber through the tube of one of the water stop devices to increase the air pressure in the sealed chamber, and the sewage in the sealed chamber is siphoned.
The pendulum can be instantly and easily discharged from the lower end of the pendulum to the outside of the closed room through the through hole, the annular groove, the hole, and the hollow part of the tube. At that time, the water stop device or the like twists and rotates due to the tension of the wire, but the pendulum is always positioned downward due to its own weight, and the sewage is sucked up into the water absorption hole of the pendulum.

〔Example〕

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

1 is a pipe installed underground, 2 is a manhole provided at both ends of this pipe 1, and 3 is a wire 4, 5 at the front and back.
6 is a guide sled installed on the four sides of the TV camera 3, and 7 is the wire 4 drawn out to the ground through one of the manholes 2. 8 is a winch with one end wrapped around it; 8 is a winch with one end of the wire 5 pulled out to the ground through the other manhole 2; 9 is a cathode ray tube installed on the ground; one end of this cathode ray tube 9 is connected to the television camera 3; The area photographed by the television camera 3 is displayed through the communication line. 1
0 is the first water stop device installed between the front of the TV camera 3 and the wire 4, and 11 is the other wire 5.
13 is an air compressor installed on the ground; 14 has one end connected to this air compressor 13, and the other end connected to a hose drum. This tube is connected to the second water stop device 11 along the cable 5 via the tube 15 .

2 and 3 show the first water stop device 10,
16 is a tube body, 17 is several flanges provided at intervals on the outer periphery of this tube body 16, and 18 is each of these flanges 1.
7 is an annular sponge fitted on the outer periphery of 7, and 19 is a collar-shaped rubber packing provided on the outer periphery of the tube 16 between each of these collars 17, and the outer diameter of each of these rubber packings 19 is the outer diameter of the annular sponge 18. is the same as
These outer diameters are slightly larger than the inner diameter of the pipe line 1. 20 is a fan-shaped pendulum rotatably provided on the outer periphery of one end of the tube 16; 21 is a center hole passing through the center of the root of the pendulum; the tube 16 is inserted through the center hole 21; 22 is this center hole 2
An annular groove 21 is formed between the inner periphery of the center hole sandwiched between these two annular metals 22 and 22 and the outer periphery of the tube body 16.
a is formed. 23 is a water absorption hole extending from the center of the arcuate edge of the pendulum 20 to the annular groove 21a of the center hole 21, and 24 is a transparent hole bored in the outer periphery of the tube body 16 opposite to the annular groove 21a of the center hole 21 of the pendulum 20. The through hole 24 communicates with the hollow portion 25 of the tube body 16 . 26, a cap-shaped portion is fixed to one end of the outer tube body 16 of the pendulum 20,
A locking fixture having a locking hole 26a, 27 is a tube body 1
6 has a cap-shaped portion fixed to the other end thereof, and has a locking hole 27a. Reference numeral 28 is a drainage hole that connects the inner periphery of the cap-shaped portion of this locking device 27 with the locking hole 27a.

4 and 5 show the second water stop device 11,
Reference numeral 29 indicates an inner circumferential tube that covers the outer circumference of the cable clamp 12, 30 indicates an outer circumferential tube that covers the outer circumference of the inner circumferential tube 29, and has a collar 30a at one end. Several flanges are provided with openings, 32 is an annular sponge fitted to the outer periphery of this flange 27, and 33 is a flange-shaped rubber packing fitted to the outer periphery of the outer circumferential tube 30 between the flange 30a and each of the flanges 31. The outer circumferential diameter of each of these rubber packings 33 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. 34 is a long tube that extends from the outer surface of the collar 30a through each rubber packing 33 and each collar 31 to the outer surface of the outer collar 31; 35 is provided on the outer surface of the collar 30a;
A tube connector 35 is connected to the open end of the long tube body 34, and the tube 14 is connected to this tube connector 35. 36 is the inner tube 2
This is a fixing body that fixes the cable clamp 9 and the outer circumferential tube 30 to the outer periphery of the cable clamp 12.

In this embodiment, a first water stop device 10 is connected to one end of the wire 4, and the first water stop device 10
Connect the TV camera 3 to the rear slightly away from the
Cable clamp 1 behind this TV camera 3
2 is provided with a second water stop device 11, the wire 5 is connected to the cable clamp 12, and these are inserted from one end of the conduit 1. While winding up the wire 4 with the winch 7, the wire 5 is inserted from one end of the conduit 1. Move the television camera 3 to the other end. This television camera 3 photographs the inner wall of the conduit 1.
The first water stop device 10 and the second water stop device 11 are
Since the outer circumferential diameters of the rubber packings 19 and 33 and the annular sponges 18 and 33 are slightly larger than the inner circumferential diameter of the conduit 1, they close the conduit 1. Therefore, the first water stop device 1
A sealed chamber 37 containing a television camera 3 is formed between 0 and the second water stop device 11, and this sealed chamber 37 is moved in the longitudinal direction within the conduit 1 by the movement of the television camera 3. do. Therefore, when the sealed chamber 37 moves through a place in the conduit 1 where sewage has accumulated, it is difficult for sewage to enter the sealed chamber 37. Therefore, depending on the amount of sewage, the inner wall of the conduit 1 inside the sealed chamber 37 can be clearly photographed. However, if the amount of sewage is large, when moving the sealed room 37, the water stop device 1
Sewage enters the sealed chamber 37 from the outer periphery of the rubber packings 19 and 33 numbered 0 and 11. In this case, stop the TV camera at the point in pipe 1 that you want to photograph,
Tube 1 from ground air compressor 13
4. Send compressed air into the sealed chamber 37 via the tube connector 35 and the long tube body 34. On the other hand, since the pendulum 20 provided in the first water stop device 10 is rotatably provided in the tube body 16 and always hangs downward due to its own weight, the lower opening of the water intake hole 23 is always in a closed room. It is located at the bottom of 37 conduit 1. Therefore, as described above, when compressed air is sent into the sealed chamber 37 and the sealed chamber 37 is filled with compressed air, the pressure inside the sealed chamber 37 increases, and a pressure difference is created between the sealed chamber 37 and the outside. The sewage inside is drained from the water absorption hole 23 of the pendulum 20, the annular groove 21a, and the through hole 2.
4. The sealed chamber 37 passes through the hollow part 25 and the drainage hole 28.
It is immediately drained into the outer conduit 1. In this case, due to the siphon action, all of the waste water in the sealed chamber 37 is drained, regardless of its amount.

Also, when pulling the wire 4 in the conduit 1 and moving the television camera 3, the first water stop device 10
etc. rotate within the conduit 1 due to the twisting of the wire 4, etc., but this causes the through hole 24 of the tube body 16 to also be located above or to the side. However, in this embodiment, as described above, the pendulum 20 is always positioned downward due to its own weight, and one end of the water absorption hole 23 of the pendulum 20 currently faces the groove 21a, and the through hole 24 of the tube body 16 is positioned at any position. However, since it faces the annular groove 21a, the sewage is always flowing into the pendulum 2.
The water is discharged from the water absorption hole 23 of No. 0 through the hollow portion 25 of the pipe body 16 to the lower part of the first water stop device 10 .

〔Effect of the invention〕

In this invention, even if sewage accumulates inside the pipe, the TV camera is placed inside the closed room, so it is difficult for sewage to enter the closed room, and the condition of the inner wall of the pipe can be clearly photographed in this closed room. can. Furthermore, even if sewage enters the sealed chamber, the sewage can be immediately and easily drained out of the sealed chamber. At that time, compressed air is sent into the sealed room from one of the water stop devices, increasing the air pressure inside the sealed room and creating a pressure difference with the outside.
The siphon action causes water to drain through the other water stop device.

Therefore, all of the sewage in the closed room can be drained regardless of the amount of sewage.

In the other water stop device, a pendulum is rotatably suspended from the end of the pipe that penetrates the water stop device and protrudes into the sealed chamber, and the pendulum is passed through the hollow part of the pipe from the lower end of the pendulum. Even if this water stop device rotates inside the pipe due to the tension of a wire, etc., the pendulum always hangs downward under its own weight, and the sewage at the bottom of the pipe can be absorbed. .

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 drawings]

FIG. 1 is a schematic diagram showing the state of use of the present invention, FIG. 2 is a cross-sectional front view of the first water stop device of the present invention,
3 is a sectional view taken along the line A-A in FIG. 2, FIG. 4 is a sectional front view of the second water stop device of the present invention, and FIG.
The figure is a left side view of the same, and FIG. 6 is a cross-sectional view showing the state of use of the present invention. In the figure, 1 is a pipe, 2 is a manhole, 3 is a television camera, 4 and 5 are wires, 9 is a cathode ray tube,
10 is a first water stop device, 11 is a second water stop device,
12 is a cable clamp, 13 is an air compressor, 14 is a tube, 19 is a rubber gasket,
20 is a pendulum, 21 is a center hole, 23 is a water absorption hole, 2
4 is a through hole, 25 is a hollow part, 33 is a rubber packing,
34 is a long tubular body.

Claims (1)

[Claims] 1 In the case of a TV camera for underground pipe inspection, which involves inserting a TV camera into the pipe and moving it within the pipe using wires connected to the front and back of the TV camera to take pictures of the inside of the pipe, the above-mentioned A first water stop device and a second water stop device consisting of packing that closes the pipe are installed on the wires in front and behind the TV camera, and the water stop device is moved within the pipe between these two water stop devices. One of the water stop devices is equipped with a pipe body that sends compressed air from the outside to the closed room, and the other water stop device is equipped with a pipe that drains the sewage inside the closed room to the outside. On the outer periphery of the closed end of the tube that penetrates the body and protrudes into this sealed chamber,
A hole leading to the hollow part of the tube is bored, one end of the pendulum is rotatably suspended from the outer periphery of the tube so as to cover the hole, and the inner part of the pendulum that is in contact with the outer periphery of the tube having the hole is inserted from the lower end of the pendulum. A pipe water stop device characterized by having a water absorption hole that reaches an annular groove provided around the circumference.