JPH081465B2 - Detection system for branch pipe openings after in-pipe lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an opening of a branch pipe after lining an aged sewer pipe, water pipe, gas pipe, etc. piped underground or in a building with a new pipe. The present invention relates to a perforation method for perforating.

(Prior Art) Recently, for example, a lining construction method called a rehabilitation pipe construction method is used for laying a new pipe by regenerating an aged sewer pipe or the like.

This rehabilitating pipe construction method is a method in which a synthetic resin strip is spirally wound to form a renewal pipe into an existing pipe and lining it, and a backing agent is injected into the gap between the renewal pipe and the existing pipe. When such a rehabilitating pipe construction method is adopted for an existing pipe having an attachment pipe (branch pipe), a through hole for a branch pipe must be drilled after injecting the backing agent.

Conventionally, when an existing pipe is made of a magnetic material such as iron, a method has been proposed in which a magnetic sensor is used to detect the opening of the branch pipe and a through hole for the branch pipe is drilled from inside the renewal pipe. (See, for example, JP-A-56-127420).

However, if the existing pipe is made of non-magnetic material made of concrete material such as so-called fume pipe,
The drilling method using the magnetic sensor described above cannot be applied.

Apart from this, a method of inserting a perforator into the branch pipe and perforating from the side of the branch pipe may be considered, but it may be difficult to insert the perforator depending on the piping condition of the branch pipe.

Therefore, in order to solve the above-mentioned problems, the applicant has previously proposed some epoch-making methods as a method for perforating a branch pipe opening after lining the pipe (for example, JP-A-2-54088, JP-A-2-54088). No. 2-54089).

The perforation method proposed by the applicant is a method of perforating an opening of a branch pipe closed by a lining from the main pipe side, and is composed of an antenna coil and a resonator and is excited by an excitation signal for exciting the resonator. A position detecting marker that vibrates and emits a resonance signal remaining in the resonator from the antenna coil after the excitation signal is stopped is disposed at a position substantially concentric with the branch pipe axis. A water tap is inserted into the branch pipe opening before lining, and after lining, a loop antenna that detects the maximum value of the resonance signal and / or a loop antenna that detects the minimum value of the resonance signal. A robot equipped with one of them and equipped with perforation means is run inside the main pipe, thereby detecting the position of the position detection marker, and driving the perforation means with the position of the marker as a target. A method of drilling the lateral pipe opening of the main pipe side.

(Problem to be Solved by the Invention) According to the punching method described above, the position of the branch pipe opening can be accurately detected, and the branch pipe opening can be surely punched. However, when the main pipe (renewal pipe) has a large diameter (approximately 600 mm or more) that allows people to come in and out, a robot that performs detection of a position detection marker and perforation of a branch pipe opening is remotely controlled from the ground. Rather than the above method, it is more efficient for the operator to enter the pipe and directly detect the position of the position detecting marker (water stopcock) and punch the branch pipe opening. However, the present situation is that a detection system suitable for it has not been provided yet.

The present invention has been made in view of the above circumstances, and is particularly intended to provide a system suitable for an operator to enter the pipe and directly detect the position of the water stopcock.

(Means for Solving the Problem) In order to achieve the above object, a detection system for a branch pipe opening after an inner pipe lining according to the present invention is performed by lining the inside of a main pipe having a branch pipe to rehabilitate the main pipe. In this case, a system for detecting the position of the opening of the branch pipe closed by the lining prior to punching the opening from the main pipe side, the resonator comprising an antenna coil and a resonator A position detecting marker that vibrates by an excitation signal that excites and that emits a resonance signal remaining in the resonator from the antenna coil after the excitation signal is stopped is provided and inserted in each branch pipe opening. A plurality of water stoppers to be attached, a detection loop antenna for transmitting the excitation signal and receiving the resonance signal, and an oscillation of the excitation signal and the resonance connected to the detection loop antenna A signal processing device that detects a signal and transmits a level detection signal indicating a change in the signal level of the detected resonance signal, and a signal processing device that is carried by a pipe operator and is based on the level detection signal transmitted from the signal processing device. In addition, the informing means for informing the in-pipe operator of the position information of the position detecting marker is provided.

(Operation) Prior to lining, a water stop valve provided with a position detection marker is inserted into the branch pipe opening.

When the lining on the inside of the main pipe is completed, the worker inside the pipe comes into the main pipe with the detection loop antenna and / or the portable wireless device and / or the level meter as the notification means. The signal processor shall be installed on the ground or in a manhole in the pipeline.

First, the signal processing device is set to the excitation signal oscillation mode, and the excitation signal for exciting the resonator of the position finder marker of the water stopcock is oscillated. As a result, an excitation signal is transmitted from the detection loop antenna, so that the in-pipe operator carries the detection loop antenna and travels within the main pipe for a predetermined distance. Then, the marker for position detection of the water stop located at the passing position receives the excitation signal transmitted from the detection loop antenna, and the resonator of the marker vibrates at a constant resonance frequency. A resonance signal corresponding to the level is oscillated from the antenna coil.

Next, the signal processor is switched from the excitation signal oscillation mode to the resonance signal detection mode, and the operator inside the pipe detects the loop antenna for detection so that the loop surface is parallel to the axis of the antenna coil of the position detection marker. Wait,
Return to where you have been.

When approaching the stopcock, the resonance signal from the position detection marker is received by the detection loop antenna, and the resonance signal is detected by the signal processing device. The signal processing device outputs a level detection signal indicating a change in the signal level of the resonance signal,
Transmit to the portable radio and level meter of the in-service worker.
The signal level of the resonance signal changes at this time because the loop surface of the detection loop antenna is parallel to the axis of the antenna coil of the resonator, as shown in FIG. It becomes larger as it approaches the position-finding marker, then reaches a maximum value, and then reaches a local minimum (almost zero) at the same time when the loop antenna for detecting reaches the axis of the position-finding marker. This change in signal level is extremely sharp.

At this time, the speaker of the portable wireless device outputs a sound having a different size or frequency (pitch) according to the change in the signal level. At the same time, the pointer of the level meter swings according to the change in the signal level. The operator in the pipe knows the position of the water stopcock in the axial direction of the main pipe by recognizing the change in the sound and observing the swing of the pointer of the level meter.

Next, when the position of the main pipe in the axial direction is detected, the loop antenna for detection is placed in the circumferential direction along the inner wall surface of the main pipe with its loop surface orthogonal to the axis of the antenna coil of the position detection marker. Move to.

This time, since the loop surface of the detection loop antenna is orthogonal to the axis of the antenna coil of the position detection marker, the signal level of the resonance signal received by the detection loop antenna is as shown in FIG. In addition, it becomes larger as the detection loop antenna approaches the position detection marker, and finally becomes maximum. Similar to the above, this change is notified to the in-pipe worker by the portable wireless device and the level meter, so that the in-pipe worker knows the position of the position detection marker in the main pipe circumferential direction.

With the above, the position of the water stopcock has been detected. After this, a mark is placed on the detected position, and the target is punched with a suitable punching device. As a result, the branch pipe opening is bored from the main pipe side. The water stopcock is poured into the main pipe destroyed by perforation.

(Example) Hereinafter, the Example of this invention is described with reference to drawings.

The perforation system for branch pipe openings after in-pipe lining according to the present invention includes a plurality of water stoppers 10 ... And a loop antenna 11 for detection.
, Signal processing device 12, portable wireless device 13, and level meter
It is equipped with 14 and.

As shown in FIG. 5, the water stopcock 10 is made of a foam material such as styrene and urethane. In this example, the branch pipe A is used.
A disk-shaped water stop main body 15 having the same shape as the inner peripheral shape of the above, a leg piece 16 hanging from the periphery of the water stop main body 15, and a flange portion 17 formed at the tip of the leg piece 16 Has been done.
Since the water stop plug 10 thus constructed is perforated and covered with the renewal pipe D, an inexpensive one made of a solid foam having closed cells is preferable. For example, a non-foaming resin. It may be hollow, solid or arm-shaped.

At the central portion of the water stop body 15 of the water stopcock 10 and at a position that is substantially concentric with the pipe axis of the branch pipe A when the water stop body 15 is inserted into the opening of the branch pipe A. Has a location marker 19 embedded therein. The position detecting marker 19 is composed of an antenna coil and a resonator (not shown), and is located at a position substantially concentric with the tube axis of the branch pipe A, that is, the axis of the antenna coil coincides with the tube axis. It is arranged to do.
A piezoelectric vibrating body such as a crystal oscillator is used as the resonator. In this way, when a piezoelectric vibrating body is used as the resonator, the amount of energy stored in it is large, so a large resonance signal can be obtained with respect to the excitation signal, and the number of turns of the antenna coil can be at most several times. The marker 19 itself can be miniaturized. The position detecting marker 19 may be composed of a general LC resonance circuit. By the way, a position detection marker like this
19 is not necessarily required to be embedded in the central portion of the water stop body 15, and is attached to the head of the water stop body 15 if it is in a position substantially concentric with the pipe axis of the branch pipe A. Alternatively, it may be attached to the bottom.

The water stop plug 10 is of a type that is inserted from the side of the main pipe B into the opening of the branch pipe A. The faucet 10 should be of the inflatable type. In this case, after reaching the predetermined position of the water stopcock 10 in the reduced diameter state, a fluid such as air is fed to expand the diameter, or the waterstop main body
It is necessary to expand the diameter by injecting it into the water-swellable resin that composes 15.

The detection loop antenna 11 is for transmitting an excitation signal to the position detection marker 19 of the water stopcock 10 and for receiving a resonance signal transmitted from the position detection marker 19. The detection loop antenna 11 is housed in a disk-shaped case body 20 made of a non-magnetic material, as shown in FIGS. 2 and 3. A grip portion 21 is provided on one surface of the case body 20 along the diameter direction of the body 20.

As shown in FIG. 4, the signal processing device 12 includes an oscillation / detection circuit 22 for oscillating an excitation signal and detecting a resonance signal.
A level detection signal generation circuit 23 for generating a level signal detection signal indicating a change in the signal level of the resonance signal detected by the oscillation / detection circuit 22, and a signal generated by the level detection signal generation circuit 23 A speaker 24 for converting into a signal and transmitting the signal, and a battery 25 for supplying power to each of the above circuits are provided. The signal processing device 12 thus configured is connected to the detection loop antenna 11 via the transmission / reception cable 26. In addition, a wireless transmitter 27 that receives an audio signal transmitted from the speaker 24 and transmits the audio signal to the portable wireless device 13 is set near the speaker 24.

The portable wireless device 13 and the level meter 14 constitute an informing means in the present invention, and are carried by the in-pipe operator P. The portable wireless device 13 is for receiving the signal transmitted from the wireless transmitter 27, and is a level meter.
Reference numeral 14 indicates a level change of the level detection signal generated by the level detection signal generation circuit 23 of the signal processing device 12. The level meter 14 and the level detection signal generation circuit 23 of the signal processing device 12 are connected to the transmission / reception cable 26.
It is connected via a communication cable 28 that is provided in parallel with and is provided at a position close to the detection loop antenna 11 so that the pointer can be easily visually recognized. Also,
The level meter 14 is provided with a pointer illumination lamp (not shown) so that it can be visually recognized even in the dark main pipe B.

Next, the operation of the detection system as described above will be described.

First, the water stopper 10 is held in the existing pipe C before lining, and the water stopper 10 is inserted into the opening of each branch pipe A.

After the insertion work of the water stopcock 10 ... is completed, lining is performed by an arbitrary construction method such as a rehabilitation pipe construction method. FIG. 1 shows the state after lining. Reference symbol S in the figure is an existing pipe C
2 shows a backing agent composed of mortar or the like injected between the rehabilitation tube D and the rehabilitation tube D. When using this rehabilitation pipe construction method,
Since the backing agent S is injected into the gap between the openings of the branch pipe A and the backing agent S pushes up the water stopper 10 to the side of the branch pipe A,
The water stop plug 10 tightly seals the opening of the branch pipe A to prevent water leakage, and the backing agent S does not leak to the side of the branch pipe A.

When the lining is completed, the in-pipe operator P, the detection loop antenna 11, the portable wireless device 13, and the level meter 14
And enter either or both of them into the main pipe B. The signal processing device 12 is installed in the manhole M on the ground or in the pipeline. Whether to carry both the portable wireless device 13 and the level meter 14 into the main pipe B or to bring either one of them into the main pipe B is appropriately selected according to the size of the main pipe B. That is, when the diameter of the main pipe B is such that the in-pipe worker P cannot stand up, the level meter 14 becomes difficult to see.
It is good to use only the portable radio 13 that can be detected by voice,
When the in-pipe operator P stands in sufficiently, it is better to bring in both the portable wireless device 13 and the level meter 14 in terms of operability. In the illustrated example, the portable wireless device 13 and the level meter 14
It shows the case where both of them enter the main pipe B.

Next, the signal processing device 12 is set to the excitation signal oscillation mode to oscillate the excitation signal for exciting the resonator of the position detecting marker 19 of the water stopcock 10. As a result, an excitation signal is transmitted from the detection loop antenna 11, so that the in-pipe operator P holds the detection loop antenna 11 and travels within the main pipe B for a predetermined distance. Then, the position-detecting marker 19 of the water stopcock 10 located at the place where it passes, receives the excitation signal transmitted from the detecting loop antenna 11, and the resonator of the marker 19 vibrates at a constant resonance frequency. Then, a resonance signal corresponding to this vibration level is oscillated from the antenna coil.

Subsequently, the signal processing device 12 is switched from the excitation signal oscillation mode to the resonance signal detection mode, and the in-pipe operator P
Holds the loop antenna 11 for detection so that its loop surface is parallel to the axis of the antenna coil of the position detection marker 19, and returns to where it has been proceeding.

When approaching the stopcock 10, the resonance signal from the position detection marker 19 is received by the detection loop antenna 11 and sent to the signal processing device 12 via the transmission / reception cable 26. The resonance signal sent to the signal processing device 12 is an oscillation / detection circuit.
Detected at 22. The level detection signal generation circuit 23 in the signal processing device 12 generates a level detection signal indicating a change in the signal level of the resonance signal based on it. This level detection signal is output to the speaker 24, and is output as sound from the speaker 24. This voice is picked up by the wireless transmitter 27, which sends it to the portable wireless device 13 in the main B.
Send to. At the same time, a level detection signal is transmitted from the level detection signal generation circuit 23 to the level meter 14 via the communication cable 28. The signal level change of the resonance signal at this time is such that the loop surface of the detection loop antenna 11 is parallel to the axis of the antenna coil of the above-mentioned resonator, so that the detection loop antenna 11 can be detected as shown in FIG. Becomes larger as the position detection marker 19 approaches,
After reaching the maximum value, the detection loop antenna 11 reaches the minimum value (nearly zero) at the same time when it reaches the axis of the position detection marker 19. This change in signal level is extremely sharp.

At this time, the speaker of the portable wireless device 13 outputs a sound having a different size or frequency (pitch) according to the change in the signal level. At the same time, the pointer of the level meter 14 swings according to the change in the signal level. The in-pipe operator P knows the position of the water stopcock 10 in the axial direction of the main pipe by recognizing the change in the above-mentioned voice and observing the deflection of the pointer of the level meter 14.

Next, when the position in the axial direction of the main pipe is detected, the loop antenna 11 for detection has a loop surface whose position detection marker.
The antenna coil 19 is moved in the circumferential direction along the inner wall surface of the main pipe B so as to be orthogonal to the axis center of the antenna coil (shown by a chain line in FIG. 5).

This time, since the loop surface of the detection loop antenna 11 is orthogonal to the axis of the antenna coil of the position detection marker 19, the signal level of the resonance signal received by the detection loop antenna 11 is shown in FIG. As shown in FIG. 3, the detection loop antenna 11 becomes larger as it approaches the position detection marker 19, and then becomes maximum. This change
Similarly to the above, the in-pipe operator P is informed by the portable wireless device 13 and the level meter 14, and the in-pipe worker P knows the existing position of the position detection marker 19 in the main pipe circumferential direction.

This means that the position of the stop cock 10 has been detected. Hereinafter, the above-mentioned operation is repeated to sequentially detect the positions of the remaining stop cocks 10 ... Mark the detected position,
Perforation is performed by using an appropriate perforation device, for example, a perforation cutter such as a hole saw or a water jet device, aiming at the mark. As a result, the opening of the branch pipe A is perforated from the main pipe B side. During this perforation step, the water stopcock 10 is destroyed and poured into the main pipe B.

In this example, the case of the rehabilitating pipe construction method is illustrated as the lining method, but the present invention is not limited to this, and the opening portion of the manhole M is further excavated to lower the new pipe directly into the ground, and the new pipe is The present invention can also be applied to a lining method of sequentially laterally feeding and a so-called reversal method (see, for example, JP-A-55-15852). Also, the signal processing device
12 and a wireless transmitter 27 for transmitting the sound transmitted from the speaker 24 of the signal processing device 12 to the portable wireless device 13 in the main B.
Although and are separated, they may be integrated. Further, the portable wireless device 13 carried by the in-pipe operator P may be replaced with a wired receiver.

(Effects of the Invention) As described above, according to the present invention, the opening of the branch pipe after lining can be detected extremely accurately from the main pipe side. Therefore, the opening of the branch pipe closed by the lining can be surely pierced without damaging other portions.

[Brief description of drawings]

The drawings show an embodiment of a detection system for a branch pipe opening after in-pipe lining according to the present invention. Fig. 1 is a sectional view showing the usage state of the detection system, and Fig. 2 is a bottom view showing a detection loop antenna. FIG. 3 is a front view of the same, FIG. 4 is a block diagram showing the electrical configuration of the detection system, FIG. 5 is a cross-sectional view for explaining the detection operation, and FIGS. 6 and 7 are detection loop antennas. FIG. 6 is a diagram for explaining a change state of a signal level of a resonance signal due to a change in a positional relationship between the resonator and the resonator. 10 ... Stopcock 11 ... Detecting loop antenna 12 ... Signal processing device 13 ... Portable wireless device (informing means) 14 ... Level meter (informing means) 19 ... Position detecting marker A ... Branch pipe B ... Main pipe C ... Existing Pipe D ... Renewal pipe P ... Internal worker

Claims (1)

[Claims] 1. When lining the inside of a main pipe having a branch pipe to rehabilitate the main pipe, the opening portion of the branch pipe closed by the lining is opened before the opening from the main pipe side. A system for detecting the position of the antenna coil, which is composed of an antenna coil and a resonator and is vibrated by an excitation signal for exciting the resonator, and after the excitation signal is stopped, remains in the resonator from the antenna coil. A position detection marker for emitting a resonance signal, and a plurality of water stoppers inserted into the branch pipe openings; and a detection loop antenna for transmitting the excitation signal and receiving the resonance signal. A signal processing unit which is connected to the detection loop antenna, oscillates the excitation signal and detects the resonance signal, and transmits a level detection signal indicating a change in the signal level of the detected resonance signal. After the in-pipe lining provided with a device and an informing means for informing the in-line worker of the position information of the position detection marker based on the level detection signal transmitted from the signal processing device, which is carried by the in-line worker System for detecting branch pipe openings.