JPH0765711B2 - Drilling method for branch pipe openings after pipe lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the 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. A perforation method for perforating a part.

(Prior Art) Recently, for example, a lining construction method called a rehabilitation pipe construction method is used to regenerate an aged sewer pipe and lay a new pipe.

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 adopting such a rehabilitating pipe construction method for an existing pipe having a mounting pipe (branch pipe), after injecting the backing agent,
Through holes for branch pipes must be drilled.

Conventionally, when the 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 within the renewal pipe. (See, for example, JP-A-56-127420).

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

On the other hand, it is possible to insert a perforator into the branch pipe and perform perforation from the branch pipe side, but in the construction of the sewer rehabilitation pipe, 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 conventional problems, the applicant has previously proposed the following method of piercing the branch pipe opening after the pipe lining. This drilling method is composed of an antenna coil and a resonator and vibrates by an excitation signal for exciting the resonator, and after the excitation signal is stopped, the resonance signal remaining in the resonator is emitted from the antenna coil. A position stop marker is placed at a position that is approximately concentric with the branch pipe axis, and is inserted into the branch pipe opening before lining, and after lining, the loop surface is used for the position detection. A first loop antenna that is orthogonal to the axis of the antenna coil of the marker and that detects the maximum value of the resonance signal; and a second loop antenna that has a loop surface that is parallel to the axis and that detects the minimum value of the resonance signal. The antenna trolley is run inside the main pipe,
After detecting the position of the position detection marker in the main pipe axial direction based on the detection result of the minimum value, the position in the main circumferential direction of the position detection marker based on the detection result of the maximum value is determined. After the detection, the perforation means is driven by targeting the position of the position detection marker to perforate the branch pipe opening from the main pipe side.

(Problems to be Solved by the Invention) According to the above-mentioned perforation method proposed by the applicant, although it is possible to detect the position of the branch pipe opening with high accuracy, two or more branch pipe openings are formed. When they are close to each other, it is difficult to detect the positions of the branch pipe openings. That is, when the branch pipe openings are symmetrical with respect to the main pipe axis, the resonance signals transmitted from the position locating markers of the water stop plugs inserted in the branch pipe openings are shown in FIG. As shown in, they are received in an almost overlapping state. Also, when the branch pipe openings are close to each other with their pipe axes slightly offset, each resonance signal transmitted from the position detection marker of the water stopcock inserted in the branch pipe openings. However, as shown in FIG. 8, the local maximum values are received in a state of being close to each other. When such a situation occurs, it is almost impossible to accurately detect the maximum value of the target signal level of the resonance signal, and it is difficult to detect the position of the branch pipe opening.

The present invention has been made to further improve the perforation method, and a method capable of accurately detecting and perforating the opening of each branch pipe even when a plurality of branch pipes are present close to each other. It is the one we are trying to provide.

(Means for Solving the Problems) In order to achieve the above object, a method for perforating a branch pipe opening after in-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, there is provided a method of piercing the opening of the branch pipe closed by a lining from the main pipe side, which comprises an antenna coil and a resonator and vibrates by an excitation signal for exciting the resonator, and the excitation Before the lining of the water stopcock, the position detection marker for emitting the resonance signal remaining in the resonator from the antenna coil after the signal is stopped is arranged at a position substantially concentric with the branch pipe axis. When the branch pipe openings are inserted into the branch pipe openings, and the branch pipe openings are close to each other, position detecting markers having different resonance signal frequencies are arranged at the adjacent branch pipe openings. The stopcock After inserting and respectively lining, the loop plane is made parallel to the pipe axis of the main pipe, and an antenna carriage equipped with a loop antenna for detecting the maximum value of the resonance signal is run inside the main pipe, Of the resonance signal of the one position-finding marker by detecting the resonance signal of the one position-finding marker by tuning the reception frequency of the one to the frequency of the resonance signal of one of the position-finding markers. After identifying the presence position of the one position-finding marker,
The branch pipe openings were punched from the main pipe side by driving the punching means with the position of the position detection marker as a target, and the remaining branch pipe openings were also inserted into the branch pipe openings. The position of each position detection marker is specified by detecting the individual resonance signal of the position detection marker of the water faucet and detecting the maximum value of each resonance signal, and the position of each position detection marker is targeted. The branch pipe openings are sequentially punched from the main pipe side by driving the punching means.

The antenna carriage running in the main pipe functions not only as a transmitting antenna that sends an excitation signal to the resonator of the position-finding marker, but also as a receiving antenna that receives a resonance signal based on the resonance vibration of the resonator. In addition to the case where the position detecting marker is provided, the antenna carriage may have only the function as a receiving antenna.

(Operation) A case will be described in which the antenna carriage functions not only for transmission but also for reception. That is, when the antenna truck is run inside the main pipe after lining and the excitation signal is first transmitted from the loop antenna, the resonance of the position detection marker provided in the water stopcock inserted into each branch pipe opening before lining Each body vibrates at its own frequency. Since the resonance signals of these resonators are transmitted from the antenna coil, they are received by the loop antenna of the antenna carriage. At this time, the reception frequency of the loop antenna is set so as to be tuned to the frequency of the resonance signal of the resonator of the one position-detecting marker. Here, the branch pipe opening is, for example, the fourth
As shown in the figure, the position detecting marker 14a which is symmetrical with respect to the main B tube axis and which transmits a resonance signal having the same frequency as the reception frequency of the loop antenna 23 to _one branch A ₁ opening of one of them. When the loop antenna 23 exists, the loop antenna 23 detects the resonance signal S ₁ transmitted from the position detecting marker 14a existing in the _one branch A ₁ opening, and detects the position of the resonance signal S ₁ existing in the other branch A ₂ opening. The received signal is stronger than the resonance signal S ₂ transmitted from the marker 14b, and a difference occurs in the signal levels of the two received resonance signals. The signal level of these two resonant signals is
Since the loop surface of the loop antenna 23 is parallel to the tube axis of the main pipe B, in other words, orthogonal to the axial center of the antenna coil of the resonator, as shown in FIG. The loop antenna 23 draws a sine waveform that becomes large as it approaches the positions 14a, 14b, then becomes the maximum, and becomes small as the loop antenna 23 moves away from the position detection markers 14a, 14b. Since the maximum value V _{p1 of the one} resonance signal S ₁ is higher than the maximum value V _{p2 of the} other resonance signal S ₂ , the maximum value V _{p1 of the one} resonance signal S ₁ can be easily detected. By detecting this maximum value V _p1 , it becomes possible to detect the existing position of one position detection marker 14a with extremely high accuracy. After detecting the existing position of one position detection marker 14a in this way, the perforation means 26 is driven by targeting the position detection marker position to perforate the branch pipe A ₁ opening from the main pipe B side. . Due to this perforation, the one position detection marker 14a is destroyed together with the water stopcock 1a, and the signal received by the loop antenna 23 is only the resonance signal S ₂ from the other position detection marker 14b. Then, this resonance signal S ₂ is received alone, and the maximum value V _p2 thereof can be easily detected. In addition, the remaining position detection marker 14
When detecting the position of b, the reception frequency of the loop antenna 23 is set to the resonance signal S ₂ of the resonator of the position detection marker 14b.
May be tuned to the frequency of, which makes it possible to more easily detect the maximum value V _p2 .
Also, as shown in FIG. 4, when the two branch pipe openings are close to each other with the pipe axes of the branch pipes A ₃ and A ₄ displaced from each other, as shown in FIG. Each resonance signal as shown
Since there is a difference between the maximum values V _p3 and V _p4 of S ₃ and S ₄ , each maximum value V _p
p3 and V _p4 can be detected reliably, and each branch pipe A
It is possible to surely punch the openings of ₃ and A ₄ , respectively.

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

The drilling method of the present invention, the position detection markers 14a before lining, 14b ... stop cock 1a which is disposed a, 1b ... a branch pipe A _1, A ₂ ...
The step of inserting into the opening of the main pipe, the step of newly lining the inner peripheral surface of the existing pipe 2, and the step of detecting the position detecting marker position after lining and punching the branch pipe opening from the side of the main pipe B. Is included.

First, the step of inserting the water stopcock 1 will be described with reference to FIG.

In FIG. 1, a water stop cock setting robot 3 used in this inserting step has a robot main body 4 equipped with an automatic traveling means and a drive unit 5 rotatable about a horizontal axis as a central axis. It is a thing. The drive unit 5 is provided with a cylinder 6, and the cylinder head 7 of the cylinder 6 can press the inner peripheral surface of the existing pipe 2 in the radial direction at the position where the rotation of the drive unit 5 is stopped. Is.

As shown in the enlarged view of FIG. 2, the water stopcock 1 is made of a foam material such as styrene and urethane, and in this example, it is a disc-shaped stopper having the same shape as the inner peripheral shape of the branch pipe A. Water body 8
And a leg piece 9 hanging down from the periphery of the water blocking body 8 and a collar portion 10 formed at the tip of the leg piece 9 in a hat shape. Here, the recess 11 surrounded by the leg pieces 9 is a portion into which the cylinder head 7 is inserted.

Since the water stopcock 1 used in the present invention is perforated and destroyed together with the renewal pipe 16, an inexpensive one made of a solid foam having closed cells is preferable. It may be a hollow, solid or arm-shaped one made of a non-foaming resin, and is not particularly limited in shape, material and the like.

A position detecting marker at a central portion of the water stop main body 8 at a position substantially concentric with the pipe axis of the branch pipe A when the water stop main body 8 is inserted into the opening of the branch pipe A. 14 is embedded. The position detecting marker 14 is composed of an antenna coil and a resonator, and is arranged at a position substantially concentric with the tube axis, that is, the axis of the antenna coil is aligned with the tube axis. 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 position detection marker 14 itself can be miniaturized. In addition, the position detection marker 14 is a general
It may be composed of an LC resonance circuit. To change the frequency of the resonance signal transmitted from the position detecting marker 14 as described above, the natural frequency of the piezoelectric vibrating body or the LC resonance circuit is changed. By the way, the position detecting marker 14 having the above-mentioned configuration is not necessarily required to be embedded in the central portion of the water blocking body 8,
It may be attached to the head portion of the water stop body 8 or attached to the bottom portion as long as it is in a position substantially concentric with the pipe axis of the branch pipe A.

Further, in this example, the water stop cock setting robot 3 is connected to the television camera car 15 via the tow wire 3a, and the image of the opening of the branch pipe A is taken by the television camera car 15 to the ground. Sent. Then, the operator on the ground controls the traveling drive of the water stop cock setting robot 3 and the drive of the cylinder 6 while checking this image.

Then, the cylinder head 7 of the robot 3 for setting the water stopper
Insert the recess 11 of the water stopcock 1 into the
Along with the branch pipe A by running in the existing pipe 2 before lining with
Take a picture of the opening of the car with the TV camera car 15. The worker detects the opening of the branch pipe A based on the image taken by the TV camera car 15. The drive unit 5 of the water stopcock setting robot 3 is moved to the detection position of the opening, and the cylinder head 7 is extended by the operation of the cylinder 6 to set the water stopcock 1. At this time, since the opening of the branch pipe A may not be located at the top of the pipe, the drive unit 5 is run while appropriately turning the drive unit remotely. This work is sequentially performed for the water stopcocks 1a, 1b .... The water stopcock 1 may be inserted from the side of the branch pipe A by hanging it with a rope or the like. In this case, the water stopcock 1 needs to be of an inflatable type, and is in a reduced diameter state. After reaching a certain position of a certain water stopcock 1, it is necessary to increase the diameter by sending a fluid such as air to increase the diameter, or by pouring water into a water-expandable resin forming the water stop main body 8.
Here, when the two branch pipes A ₁ and A ₂ are present close to each other as shown in FIG. ₁ , the water stop plugs inserted into the openings of the respective branch pipes A ₁ , A ₂ ... The stopcocks 1a and 1b are different in the frequencies of the resonance signals of the respective position-finding markers 14a and 14b.
The difference between the frequencies of the resonance signals of the position-finding markers arranged on each of the water stoppers 1a and 1b is, for example, 10 in the frequency range.
For the MHz generation, about 100 KHz is preferable. That is,
If the frequency of the resonance signal of the position-finding marker 14a arranged on one of the water stopcocks 1a is set to, for example, 10.7 MHz, that of the other water stopcock 1b is set to 10.6 MHz. And each branch pipe A
_1, A ₂ ... stop cock 1a to the opening of, 1b ... when inserting the, each stopcock 1a, 1b ... position detection markers 14a, the frequency of 14b ... resonance signal, the main pipe B It is preferable that the height be gradually increased or decreased in the direction along the tube axis, because the later detection operation can be efficiently performed. Also, the water stopcock
During the insertion work of 1a, 1b ..., the frequencies of the above resonance signals are confirmed in advance, and the frequency of each branch pipe is inserted and recorded. In addition, in FIG. ₁ , the _two branch pipes A ₁ and A ₂ located on the left side and the two branch pipes A ₃ and A ₄ located on the right side are considerably separated from each other, and the interference of the resonance signal is prevented. In such a case, the same water stopcock 1 that was inserted into the _two branch pipes A ₁ and A ₂ located on the left side would not occur.
The a and 1b may be attached to the branch pipes A ₃ and A ₄ located on the right side.

FIG. 3 shows a state after lining by the rehabilitating pipe construction method, reference numeral 16 is a renewal pipe, and 17 is a backing agent made of mortar or the like injected between the existing pipe 2 and the renewal pipe 16. . When this rehabilitating pipe construction method is used, the backing agent 17 is injected into the gap between the openings of the branch pipe A, and the backing agent 17 pushes up the water stopcock 1 to the side of the branch pipe A. The faucet 1 tightly seals the opening of the branch pipe A to prevent water leakage, and
The backing agent 17 does not leak to the side of the branch pipe A.

FIG. 4 is a diagram for explaining a step of detecting the position of the position detecting marker 14 after lining and punching the opening of the branch pipe A. The position detecting / drilling robot 18 used in this step is the same as the water stop set robot 3 described above.
It is composed of a robot main body 19 having an automatic traveling means and a drive unit 20. The drive unit 20 includes a rotary head 22,
The loop antenna 23 on the upper part of the rotary head 22 and the perforated cutter 26 made of a cone-shaped super steel blade are positioned on the coaxial core, that is, the center of the loop surface of the loop antenna 23 and the driving of the perforated cutter 26. The axis of the shaft 25 is aligned with each other, and the loop surface and the axis are mounted so as to be orthogonal to each other. The loop antenna 23 has its loop surface parallel to the main pipe B and the pipe axis. In other words, the position detection markers 14a, 14b ... Are provided so as to be orthogonal to the axis of the antenna coil. Further, a television camera 35 for monitoring the punching process by the punching cutter 26 is attached to the head portion 24 of the rotary head 22. The punching cutter 26 may be another punching device such as a water jet device. The position detection / drilling robot 18 thus configured is connected to the control device 13 arranged on the ground.

Then, from the loop antenna 23 in the transmission mode,
An excitation signal for exciting the resonators constituting the position detecting markers 14a, 14b ... Is transmitted, and the loop antenna 23
Moves in the main pipe B together with the position detecting / drilling robot 18. And the loop antenna 23 is a marker for position detection.
When the mounting position of 14a, 14b ... (position of the stopcocks 1a, 1b) approaches, the resonator of the position detection markers 14a, 14b vibrates at a constant resonance frequency, and corresponds to this vibration level. The generated resonance signals S ₁ and S ₂ are transmitted from the antenna coil. At this time, the loop antenna 23 is switched to the reception mode, the reception characteristic is displayed by the display means (for example, a meter, etc.) of the control device, and the loop antenna is
The reception frequency of 23 is tuned with the frequency of the resonance signal S ₁ transmitted from the position-finding marker 14a existing in the opening of _one branch pipe A ₁ . At this time, the resonance signal S ₂ is also transmitted from the position detecting marker 14b existing in the opening of the branch pipe A ₂ which is in a position opposite to the branch pipe A ₁ , and the loop antenna 23 causes the loop antenna 23 to detect these two resonance signals S 2. Receive ₁ and S ₂ at the same time. Here, the sensitivity of the loop antenna 23 is set high so that the target resonance signal S ₁ can be reliably received even if noise is received. When the position detection / drilling robot 18 further advances and the loop antenna 23 approaches the mounting position of the position detection markers 14a, 14b, the resonance signals S ₁ , S ₂ of the position detection markers 14a, 14b are changed. The signal levels gradually increase, reach a maximum, and then decrease as the loop antenna 23 moves away from the mounting positions of the position detection markers 14a and 14b. The frequencies of these two resonance signals S ₁ and S ₂ are different from each other as described above, and the reception frequency of the loop antenna 23 is tuned to the frequency of one of the resonance signals S ₁ and S _2. The waveforms of the resonance signals are different as shown in FIG. 7, and there is a significant difference between the maximum values V _p1 and V _p2 of the signal levels of the resonance signals S ₁ and S ₂ . For example, the frequency of the resonance signal S ₁ of _one position detection marker 14a 10.7MHz,
Assuming that S ₂ of the other position detection marker 14b is 10.6 MHz, the maximum values V _p1 , V of the signal levels of these resonance signals S ₁ , S ₂ are obtained.
The difference in _p2 is about 2.5V. Next, the position detection / drilling robot 18 is stopped when the signal level S ₁ hardly changes, and _one of the signal processing circuits (not shown) in the control device 13 connected to the loop antenna 23 The reference level V is lower than the maximum value V _p1 of the signal level of the resonance signal S ₁ of the position detection marker 14a and higher than the maximum value V _p2 of the signal level of the resonance signal S ₂ of the other position detection marker 14b. Set _c . This reference level V _c
If the difference between the two local maximum values V _p1 and V _p2 is 2.5 V as described above, the set value of is about 1 V higher than the larger maximum value V _p1.
Although it is set to a low value, it is not limited to this example. next,
The sensitivity of the loop antenna 23 is lowered to such a degree that searchlation does not occur, and then the position detection / drilling robot 18 is retracted. Then, the signal levels of the resonance signals S ₁ and S ₂ received by the loop antenna 23 change in the same manner as when the robot 18 moves, and one of the position detecting markers is detected.
Only the signal level of the resonance signal S ₁ of 14a reaches the reference level V _c twice before and after the maximum value V _p1 . Therefore,
These two reaching points are set as base points D ₁ and D ₂ , respectively, and the arrival of the loop antenna 23 at these base points D ₁ and D ₂ is detected by, for example, a light emitting means or a warning sound means provided in the control device 13. Be prepared to do so. The detection of the base points D ₁ and D ₂ can be easily performed by providing an appropriate circuit in the signal processing circuit of the loop antenna 23. And
The position of the position detection / drilling robot 18 corresponding to the _two base points D ₁ and D ₂ is read by, for example, a distance meter provided in the control device 13. Since the two base points D ₁ and D ₂ are equidistant from the point where the signal level of the resonance signal S ₁ has the maximum value V _p1 , they are the midpoints D of these two base points D ₁ and D _{2. The} position detection / drilling robot 18 is appropriately moved so that _m is calculated and the loop antenna 23, that is, the drilling cutter 26, comes to a position that is the intermediate point D _m . Now the perforated cutter 26
Is a marker 14a for detecting a position in the axial direction of the main pipe B.
It means that it is located in the existing position. However, at this point, it is still unclear at which position in the circumferential direction of the main pipe B the position detection marker 14a is located. Then, following this, the excitation signal is again transmitted from the loop antenna 23, and the rotary head 22 is rotated this time. Then, the resonators of the position-finding markers 14a and 14b respectively vibrate again, and the resonance signal S ₁ ,
S ₂ is sent. At this time, the loop antenna 23 is switched to the reception mode, and the resonance signals S ₁ and S ₂ are received by the loop antenna 23, but the reception frequency of the loop antenna 23 here is kept at the above-mentioned frequency, and the sensitivity is The sensitivity should be set so that searchlation does not occur. The change in the signal level of the resonance signals S ₁ and S ₂ in this case is the same as that in the case of detecting the position of the main pipe B in the pipe axis direction, and similarly reaches the reference level V _c described above. One base point R ₁ , R ₂
Is detected (see FIG. 7). And both of these base points R ₁ ,
The midpoint R _m of R ₂ is calculated, and the rotation angle of the rotary head 22 is adjusted so that the loop antenna 23 comes to the position of this midpoint R _m . As a result, the tip of the punch cutter 26 is directed to the position detecting marker 14a. Then, the punch cutter 26 is started to start punching (see FIG. 5). During this perforation step, the water stopcock 1a is destroyed and the renewal pipe is
Shed into 16. After that, the signal received by the loop antenna 23 is only the resonance signal S ₂ from the remaining position-finding marker 14b. Therefore, this time, the reception frequency of the loop antenna 23 is tuned to the frequency of the resonance signal S ₂ of the resonator of the position detection marker 14b. Then, the resonance signal S ₂
Since the signal level of is larger than the above-mentioned reference level V _c , two base points in the main pipe axial direction and the main pipe circumferential direction are taken in the same manner as above, and each intermediate point is calculated from this. Marker for locating the remaining one
Locate 14b. When detecting the position of the remaining position-finding marker 14b, instead of changing the reception frequency of the loop antenna 23, the reference level V _c ,
You may reset to a level lower than the maximum value of the resonance signal of the remaining position detecting marker 14b. When the existing position of the remaining position-finding marker 14b is specified in this way, the perforation cutter 26 is started with the position-finding marker 14b as a target to start perforation.

Hereinafter, the other branch pipe opening, that is, the even Figure 4 to the position in Otay right two branch pipes A _3, A ₄ openings, said each branch pipe A ₃ in the same manner, A ₄ opening Drill sequentially. FIG. 9 shows the signal level waveforms of the respective resonance signals S ₃ and S _{4 in} that case.

In the above embodiment, in order to detect the position of the position-finding marker 14a in the pipe axis direction of the main pipe B, the loop antenna 23 is once passed through the position-finding markers 14a and 14b, and each resonance signal S is detected. Maximum value of signal level of ₁ , S ₂ V _p1 , V
_The loop antenna 23 is retracted after detecting _p2 , respectively, and two base points D ₁ and D ₂ are detected. This is because the search point caused by the high reception sensitivity of the loop antenna 23 causes the base point D ₁ , In order to prevent the position of D ₂ from being erroneously detected, the maximum values V _p1 and V _p2 of the signal levels of the resonance signals S ₁ and S ₂ are obtained before the reference level V _c is set. This is to keep it. Therefore, it is not necessary to increase the sensitivity of the loop antenna 23 so much, and each resonance signal S ₁ ,
If the maximum values V _p1 and V _p2 of the signal level of S ₂ are known, the two base points D ₁ and D ₂ are detected from the beginning, and the position of the position detection marker 14a in the pipe axis direction of the main pipe B is detected. May be detected.

Further, in the above embodiment, in order to detect the maximum value of each resonance signal, each reference level corresponding to each signal level is set, two points at which the signal level reaches the reference level are taken, and an intermediate point between the two points is set. Although the maximum value is detected by obtaining the point, the maximum value of the signal level of each resonance signal may be directly detected without setting the reference level.

Further, all the above-mentioned detection operations may be controlled by the micro computer.

FIG. 10 shows another embodiment of the water stopcock 1, in which a cylindrical projecting portion 29 having a small diameter is formed in the central upper portion of a cylindrical waterstop body 28, and the projecting portion 29 is used for position detection. The antenna coil of the marker 30 is inserted. Further, in this case, the inner wall surface of the branch pipe A is enhanced in water blocking effect by the water blocking ring 31 provided on the outer circumferential surface of the water blocking plug body 28 at intervals in the height direction. In addition to this, the water stop cock body 28 may be formed of a bellows body.

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 manhole 32
It can also be applied to the lining method in which the opening part of the is further opened and the new pipe is directly lowered into the ground, and the new pipe is transversely fed in sequence, or the so-called reversal method (for example, refer to JP-A-55-15852). .

(Effects of the Invention) As described above, according to the method of the present invention, even when the openings of the branch pipe are close to each other, the opening of the branch pipe after lining is extremely high from the main pipe side. It can be detected with high accuracy, and the opening of the branch pipe closed by the lining can be surely perforated without damaging other portions.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an existing pipe showing a robot or the like used in the step of setting a water stopcock in the method for boring a branch pipe opening after pipe lining according to the present invention, and FIG. FIG. 3 is a partially enlarged sectional view showing a state, FIG. 3 is an inside sectional view showing a state after lining, and FIG. 4 is an inside sectional view showing a robot or the like used in a step of detecting an opening of a branch pipe and a boring process,
FIG. 5 is a sectional view of the inside of the pipe showing a state at the time of perforation, and FIG. 6 is a waveform diagram for explaining the conventional receiving state of the resonance signal when the branch pipes are symmetrically positioned with the main pipe axis interposed therebetween. FIG. 7 is a waveform diagram for explaining the reception state of the resonance signal in the method of the present invention when the branch pipes are symmetrically located with the main pipe axis sandwiched therebetween, and FIG. 8 is a diagram in which the branch pipes are displaced from each other. FIG. 9 is a waveform diagram for explaining a conventional reception state of a resonance signal when the resonance signal is positioned in a closed state, and FIG. 9 is a waveform diagram of the resonance signal in the method of the present invention when the branch pipes are positioned with their pipe axes displaced from each other. FIG. 10 is a waveform diagram for explaining the reception state, and FIG. 10 is a sectional view showing another embodiment of the water stopcock. A (A ₁ , A ₂ , A ₃ , A ₄ ) ... Branch pipe B… Main pipe 1 (1a, 1b, 1c, 1d)… Water stopcock 2… Existing pipe 3… Waterstop set robot 14 (14a , 14b, 14c, 14d)… Position detection marker 16… Renewal tube 17… Backing agent 18… Position detection / drilling robot 23… Loop antenna 26… Drill cutter V _p1 , V _p2 … Maximum value V _c … Reference level D ₁ , D ₂ … Main pipe axial direction base point D _m … Main pipe axial direction midpoint R ₁ , R ₂ … Main tube circumferential direction base point R _m … Main pipe circumferential direction midpoint S ₁ , S ₂ , S ₃ , S ₄ … Resonance signal

Continuation of the front page (56) References JP-A-63-243898 (JP, A) JP-A-63-256303 (JP, A) Actually opened 63-176007 (JP, U) , Y2)

Claims (1)

[Claims] 1. A method of piercing an opening of a branch pipe closed by a lining from the main pipe side when lining the inside of the main pipe having a branch pipe to rehabilitate the main pipe, the antenna coil A position detecting marker that vibrates by an excitation signal that excites the resonator, and that emits the resonance signal remaining in the resonator from the antenna coil after the excitation signal is stopped. Before the lining, insert a water stopcock arranged in a position substantially concentric with the pipe pipe axis into the branch pipe opening, and if the branch pipe openings are close to each other, close them. Each branch pipe opening is fitted with a water stopcock having position detection markers having different resonance signal frequencies, and after lining, the loop surface is parallel to the pipe axis of the main pipe. The maximum value of the resonance signal is detected. An antenna carriage having a known loop antenna is run in the main pipe, and the reception frequency of the loop antenna is tuned to the frequency of the resonance signal of one of the plurality of position detection markers. After detecting the resonance signal of one position detection marker and detecting the maximum value of the resonance signal to specify the existing position of the one position detection marker, perforation is performed with the position of the position detection marker as a target. By driving the means, the branch pipe opening is bored from the main pipe side, and for the remaining branch pipe openings, the individual resonances of the position locating markers of the water stopcocks inserted in the branch pipe openings. The position of each position detection marker is specified by detecting the signal and detecting the maximum value of each resonance signal, and the perforation means is driven by targeting the position of each position detection marker. Drilling method of the lateral pipe opening of the post tube lining, characterized by drilling from each branch pipe opening successively the main pipe side by.