JPH0338975A - Duct continuity testing method - Google Patents

Abstract

PURPOSE:To reduce the processes of work, to shorten the time of the process and to improve operability by executing so-called test bar insertion by a mandrel and simultaneously recording the inside condition of a duct over the full length of the duct. CONSTITUTION:Simultaneously with the insertion of the test bar into the duct by a mandrel 6, the inside condition of the duct is recorded by a recording camera 8, which is built in the mandrel 6 in a sealed state, while irradiating the front face part of the mandrel 6 toward from direction with light for lighting-up. After the mandrel 6 is inserted from one end part of the duct to the other end part, a cord for monitor is connected without decomposing the mandrel 6. Then, the reproduced picture of the record for the inside condition of the duct is projected on a monitor television and the inside of the duct is observed. Thus, the processes of the work widely is decreased and further, the condition is checked without fail over the full length of the duct.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pipe continuity test method.

[Prior art and problems to be solved by the invention] In general, when underground cable conduits etc. get old, they tend to become uneven or have foreign objects mixed in, and even lead to water leakage from joints, etc. Various problems such as these may occur, and these may cause abnormal situations such as breakage or destruction of electric wires and cables within the conduit. I needed to.

Conventionally, when inspecting a conduit, a test rod is first passed through the conduit to check whether there are any steps or foreign matter in the conduit. After that, only if there is an abnormality such as a step and the test rod cannot pass,
For example, a cable conduit inspection device described in Japanese Patent Publication No. 61-55826 was used to observe the inside of the conduit and investigate whether repairs were necessary.

In other words, the outer diameter and length of the test rod inserted into the pipe are set to predetermined sizes (deactivation size), so if the abnormality is extremely small, what should be done? There are cases where the test rod is inserted without getting caught and the abnormal part cannot be found. In such cases, there is no effect on the internal cable at present, but in the future the abnormal part will expand and it will become normal. A large step may occur sooner than the other parts.

Furthermore, in the above-mentioned cable conduit inspection equipment, etc., the power supply for the television camera, the recording device, etc. are installed outside the manhole, and the electric cord protrudes outside, making the work difficult. Moreover, the device was complicated and maintenance was troublesome.

However, the biggest drawback of the conventional inspection method is that, as mentioned above, after passing the test rod, the inside of the pipe must be inspected using a television camera, etc., which requires a large number of work steps. It also had the disadvantage of increasing costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a conduit continuity test method that can significantly reduce the number of work steps and that can reliably inspect the condition over the entire length of the conduit.

[Means for solving assignments]

In order to achieve the above-mentioned object, the pipe continuity test method according to the present invention provides a method for testing pipe continuity using a mandreel while at the same time irradiating illumination light forward from the front surface of the mandreel. A recording camera sealed inside the reel records the situation inside the pipe, and the mandrill is
After inserting the mandrill from one end of the conduit to the other end or pulling it back from an abnormal part in the conduit, disassemble the mandrill near the end of the conduit or outside the conduit. Connect a monitor cord to the mandrill and connect the recording camera to an external monitor TV, and display the recorded image of the situation inside the pipe on the monitor TV to monitor the inside of the pipe. It is something to observe.

[For production]

By inserting a mandrill into a pipe, it is possible to perform what is called a "test rod passage," and at that time, illumination light is emitted forward from the front of the mandrel, and the irradiated pipe is illuminated. The situation on the road is recorded by a recording camera.

Then, the reproduced image can be immediately displayed on a monitor TV at the work site without disassembling the mandrill, and the situation inside the pipe can be detected.

〔Example〕

Examples will be described below with reference to the drawings.

In the pipe continuity test method according to the present invention, a mandrill 6 shown in FIG. 1 is inserted into the pipe l, and as shown in FIG. A linear body 4.5 such as a rope is connected, and a worker pulls or pushes the linear body 4.5 to cause the mandrill 6 to pass through the pipe 1.

As shown in FIG. 1, the mandrill 6 has a built-in power source 7 and a recording camera 8, and is further equipped with an illumination light 9 that illuminates the front of the pipe. During the interpolation, the inside of the conduit 1 illuminated by the illumination light 9 can be recorded by the recording camera 8.

As shown in FIG. 4, the mandrill 6 is comprised of front and rear covers 10.11 and a cylindrical case body 2 interposed between the covers 10.11.

Here, the front cover 10 includes a front member 14 having a window 13 for the recording camera 8 in the center thereof, and a cylindrical rear member 15 connected to the front member 14. That is, the front member 14
The glass piece 17 is fitted into the central through hole 16 and the window portion 1
3 is formed, and i;1 side of this front member 14 has
Projecting pieces 18.18 are provided at opposite positions with respect to the axis,
The tip branch lines 4a, 4a of the linear body 4 are attached to the protruding pieces 18.18.
(See Fig. 7) A connecting hole 19' 19 is provided to which the front member 14 is connected. Also, a rib portion 20 is provided on the inner circumferential surface of the proximal end of the front member 14, and the rib portion 20 is connected to the rear member. The front end threaded portions 21 of 15 are screwed together, and the front and rear members I415 are integrated. 22 is a rotation stopper pin that is screwed onto the front member 14, and 23 is a pin that connects the front member 14 and the rear member 15. Seal 0
A sealing material such as a ring, 55 is a blind fitting hole into which the tip of the pin 22 fits, and 56 is a sealing material attached to the central through hole 16.

In addition, the front member 14 includes an illumination light 9, a window portion 24
．． 24 is provided as shown in FIG.
The illumination light from the illumination lines 1-9, 9 is emitted forward through the illumination lines 1-9, 9. Note that this window portion 24.24 is similar to the window portion 1 described above.
3 are provided in opposite positions.

Thus, the glass pieces 17 of the window portion 13 and the glass pieces 57, 57 of the window portion 24 are coated with a silicone solution to form a silicon coating film. In other words, the setting is made so that mud and the like do not adhere to the window portion 1324.

A protruding piece 26 is provided on the rear surface 25 of the rear cover 11, and a connecting hole 26 is provided in the protruding piece 26 to which the linear body 5 is connected.
7 is provided, and furthermore, an operation section 2B (see FIG. 3) such as a built-in recording camera 8 is provided.

As shown in FIG. 4, a concave circumferential groove 29 is provided on the outer circumferential surface of the rear end of the front cover 10, and a concave circumferential groove 30 is provided on the outer circumferential surface of the front end of the rear cover 11. With the front edge of the case body 12 fitted into the groove 29 and the rear edge of the case body 12 fitted into the concave circumferential groove 30, the front cover 10 and rear cover 11 are connected with bolts or the like. body 33.33
(see Figure 1), the front cover lO, the case body 12 and the rear cover 11 are integrated, and the mandrill 6
is formed. That is, the connecting body 33 reaches from the rear cover 11 to the front cover IO, the tip threaded portion is screwed into the front cover IO, and the front and rear covers 10.11 are integrally formed.
The longitudinal force)<10. The case main body 12 inserted into l1flf1 is tightened to this cover 10.10 and becomes integral. Therefore, this mandrill 6 can be assembled by fitting a tool such as a screwdriver completely into the head of the connecting body 33 (see Fig. 3) and screwing it. If it is moved back, it can be broken down into one piece. A fitting groove 35 into which a seal ring 34 such as an O-ring is fitted is provided in the biconcave circumferential grooves 29 and 30, and the inside of the mandrel 6 is sealed.

In addition, pluggable connectors (not shown) are provided at the joints of the front cover 10, the case body 12, and the rear cover 11, respectively, and connect the power source and the illumination light 9, or
The switch of the operation unit 28 and the camera 8 etc. are installed at the same time as the assembly.
Connected.

Therefore, the outer diameter dimension A and the length dimension L of the mandrill 6
(See FIG. 7) are set to predetermined dimensions as a test bar. In other words, specifically, if the inner diameter B (see Fig. 1) of the conduit l is, for example, 150 mm, the outer diameter A is approximately 14 mm.
The length is set to about 0 ms, and the length is set to about 300 ms.

Next, the recording camera 8 is as shown in FIGS. 1 and 4.
It consists of a lens section 36, a television camera section 37, and a video section 38, and the video section 38 is provided with a built-in power supply (not shown). As described above, this recording camera 8 is operated by operating the operating section 28 provided on the rear surface of the rear cover 11, as shown in FIG. Record the situation within the road. Note that the power source 7 is for the illumination light 9 and is provided behind the recording camera 8.

Here, as shown in FIG. 3, the operating section 28 has a knob 39 that rotates around an axis within a predetermined range.

The symbols S, B, OFF, REW, P, and B are written. In other words, if the mark 40 of the knob 39 corresponds to OFF, the IIt source 7 and other functions are stopped, and if the mark 40 corresponds to S or B, the recording camera 8 is turned off. At this time, if a monitor cord 48 is connected to the video monitor terminal 41 as shown in FIG. I can recognize it. Further, when the mark 40 is set to ON, the illumination light turns on and the recording camera 8 starts recording. In this case, a pilot lamp P that indicates normal operation of the recording camera 8 is provided near the symbol ON, and the start of recording can be confirmed by lighting the pilot lamp P. Then, from this state, mark 4 again
If 0 corresponds to S and B, recording will stop and only the camera will operate. If the mark 40 corresponds to REW, the recorded tape will be rewound, and if it corresponds to P and 13, the recorded tape will be played back.

As shown in FIGS. 4 and 5, cushioning materials 42a, . . . are provided inside the mandrill 6. As shown in FIGS.

That is, the cushioning materials 42a and 42b are each made of a strip-shaped body, the cushioning material 42a is fixed to the upper end of the inner peripheral surface of the case body 12, and the cushioning material 42b is fixed to the upper end of the inner peripheral surface of the case body 12.
It is fixed to the lower end of the inner peripheral surface of.

In addition, the cushion materials 42c and 42d are
The longitudinal groove 44 is fixed to the left and right ends of the inner circumferential surface of the
．． 45 is provided, and longitudinal through holes 46...
is provided. It should be noted that a cord (not shown) for connecting the power cord #7 and the illumination light 9 is inserted through the through hole 46. 42e is a cushion material interposed within the rear member 15 of the front cover IO.

Further, on the upper surface of the cushion material 42b, a band plate-like f13 is provided.
! A mounting plate 43 is fixed, and the recording camera 8 is mounted on the mounting plate 43.
and receives power supply 7. In other words, the mandrill 60 weights are unevenly distributed from this fi mounting plate 43 (unevenly distributed so that the weight is heavier at the bottom), and when inserted into the pipe line 1,
This mandrill 6 can maintain a normal posture vertically, and the recording position of the conduit 1 can be accurately grasped. Note that the lace material 42a... is made of foamed urethane resin or the like.

Next, a test method according to the present invention will be explained using the mandrill constructed as described above.

First, the tip branch lines 4a, 4a of the linear body 4 are connected to the connecting holes 19, 19 of the protruding piece 18, respectively, the tip of the linear body 5 is connected to the connecting hole 27 of the protruding piece 26, and the mandrill 6 is inserted into the manhole 49 from one end 1a of the pipe l, and as shown in FIG.
The manhole 4 holding the linear body 5 is pulled in the direction of the arrow.
By pushing the linear body 5 in the direction of the arrow, the operator inside the pipe 9 inserts the mandrel 6 from one end 1a of the pipe 1 to the other end 1b. At this time, turn knob 39.
In other words, while illumination light is irradiated from the front of the mandrill 6, the state inside the conduit 1 is recorded with the recording camera 8. In addition, in FIG. 7, 47 is a standing water remover, and by inserting the mandrel 6, the pipe i
It is for sequentially discharging the accumulated water in f, and is specifically made of urethane resin or the like.

Also, during this insertion, the video monitor terminal 41
Since the monitor cord 48 is not connected to the monitor cord 48, a blind cap is placed over the monitor cord 48.

As shown in FIG. 8, immediately after the insertion is completed, the monitor TV 5 is connected to the monitor terminal 41 in the manhole 49.
The monitor cord 48 to which 0 is connected is connected, and a reproduced image of the recorded status of the pipe I is displayed on the monitor television 50 to observe the inside of the pipe I.

Therefore, by inserting the mandrel 6 into the pipe 1 only once, it is possible to carry out the conventional "test rod insertion" and inspection inside the pipe 1, and also to check the recorded situation inside the pipe 1. It can be played immediately on the spot. In addition, since it is possible to record the entire inside of conduit I, it is possible to discover small abnormalities such as slight differences in level, and although there is currently no effect on internal cables, etc., it can be recorded as a record for the future. You can leave it behind. Note that the linear bodies 4.5 are each connected to a drum 51.
．． When inspecting a newly installed underground line consisting of a large number of conduits 1, as shown in Fig. 9, all of them have holes. Therefore, if you check the book, all the pipes 1...
・You can grasp the situation of
This hole K should be inspected. In addition, in Figure 9, 54
indicates a cable.

Next, if there is an abnormality 53 such as a foreign object in the pipe l as shown in Fig. 1O, the mandrel 6 cannot be inserted to the other end 1b, so the state shown in Fig. 10 is 11, pull the mandrill 6 in the opposite direction to that shown in FIG. 7, return the mandrill 6 to one end 1a, and then connect the monitor cord 48 to the video monitor as shown in FIG. If it is connected to the terminal 41, the above-mentioned abnormal part 5 is immediately removed.
It is possible to understand the situation in point 3. In this case, in the old example, the reproduced image is projected near the end 1a of the conduit 1, but of course this may be done by taking out the mandrill 6 from the conduit 1.

According to the embodiment described above, the mark 40 of the knob 39 is made to correspond to ON, and the video monitor terminal 4
By connecting the monitor cord 4 to the tube 1 and inserting the mandrill 6 into the tube 1, the situation inside the tube 1 can be displayed on the monitor TV 50. The situation inside Route 1 can be observed.

Note that the present invention is not limited to the above-described embodiments, and the design may be changed without departing from the gist of the present invention. For example, the power source for the recording camera 8 and the power source for the illumination light 9 may be separate. However, it is also possible to supply electricity to the recording camera 8 and illumination light 9 from the same power source.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

By performing the so-called "test rod passage" with the mandrill 6, it is possible to record the internal situation over the entire length of the pipe 1, and the reproduced image can be immediately transferred to the pipe without disassembling the mandrill 1. The situation of the conduit 1 can be inspected by displaying it on a monitor television 50 at the work place. In other words, by inserting the mandrill l into the pipe line 1 for one period, "test rod insertion" and "inspection inside the pipe line" are performed at the same time, which reduces the work process by half compared to the conventional method.
Process time is shortened, workability is improved, and it also contributes to cost reduction. Furthermore, it is possible to reliably record the situation inside the pipe line l over the entire length of the pipe line l, and the abnormal part 5 can be recorded.
Even if the number 3 is small, if the situation is kept as a record, the quality of the inspection will be good. (For example, if you inspect the abnormal part 53 over a long period of time and understand the expansion state of the abnormal part 53, you can definitely know when to repair the conduit and prevent it from having a negative impact on the internal cables.) ) Also, since the recording camera 8 inside the mandrill 6 is sealed,
Even if there is standing water in the pipe 1, water will not enter the recording camera 8, resulting in excellent durability.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the mandrill used in the pipe continuity test method according to the present invention, FIG. 2 is a front view of the same,
Fig. 3 is a rear view of the same, Fig. 4 is an enlarged half-cut view of the same, Fig. 5 is an enlarged sectional front view of the same, Fig. 6 is a simplified view of the video playback state of the recording camera, and Figs. 7 and 8 are A simplified diagram showing one embodiment of the pipe continuity test method according to the present invention, FIG. 9 is a simplified sectional view of the pipe in which the test is conducted, and FIGS. 1O, 11, and 12 show other embodiments. FIG. l... Pipeline, la, lb... End, 2... Front part, 6... Mandrill, 8... Recording camera, 48...
...Monitor cord, 50...Monitor TV, 5
3... Abnormal part. Patent Applicant Chubu Electric Power Co., Ltd. Mitsubishi Cable Industries, Ltd. Figure 1o Figure 11 Figure 12

Claims (1)

[Claims] 1. At the same time as passing the test inside the pipe with a mandrill, while irradiating illumination light forward from the front part of the mandrill,
A recording camera sealed inside the mandrel records the situation inside the pipe, and after the mandrill is inserted from one end of the pipe to the other end, or After pulling back from the abnormal part in the pipe, without disassembling the mandrill near the end of the pipe or outside the pipe,
A monitor cord is connected to the mandrill, the recording camera is connected to an external monitor television, and a reproduced image of the recording of the situation inside the pipe is displayed on the monitor TV to observe the inside of the pipe. A pipe continuity test method characterized by: