JPH0468119B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a pipe line having a branch part, in which the inner surface of the pipe is lined with a lining material, and in which the lining material at the branch part is perforated and the branch pipe is lined with a lining material. It relates to a piercing tool for connecting a pipe line to a main pipe line, and is particularly used for inserting into the branch part from the side of a bent small-diameter branch pipe and drilling a hole in the lining material that is lined with it. This relates to a drilling tool.

[Prior art and its problems]

BACKGROUND ART In general, pipes such as gas pipes and water pipes that are mainly buried underground are lined with a lining material for the purpose of repairing or reinforcing the pipes.

Conventionally, this lining method involves applying adhesive to the inner surface of a cylindrical lining material made of a flexible material, fixedly supporting one end of the lining material in an annular shape, and attaching it to the rear of the annular fixed part. Apply fluid pressure, and at the folded part formed there, turn the lining material over so that the inside becomes the outside,
The folded part is advanced into the pipe, and the turned-over cylindrical lining material is inserted into the pipe, and at the same time, the fluid pressure presses the cylindrical wall surface of the lining material on the side to which the adhesive has been applied to the inner surface of the pipe. However, a method is used in which the adhesive is solidified and bonded. This method does not require excavation of the entire length of the pipeline, but only at both ends of the pipeline in the designated construction section, and is also suitable for lining extremely long pipelines. This method has many advantages, such as being able to complete construction work in an extremely short period of time, and has been attracting particular attention in recent years.

However, when lining a pipe with this method, the cylindrical lining material is glued over the entire inner surface of the pipe, so if there is a branch in the pipe, the passage to the branch pipe is blocked. It will end up being put away. For example, when it comes to gas pipelines, main high-pressure pipes and medium-pressure pipes have almost no branching points and do not suffer from the problems described above, but low-pressure pipes at the end of the line are divided into user units, such as individual households. A large number of supply pipes for supplying gas are branched.

Therefore, if this low pressure pipe is lined in the manner described above, the passage to the supply pipe will be blocked. In such a case, if you decide to dig up the branch and drill the lining material after lining it, there will be no difference from digging the entire length of the pipe, and the biggest advantage of this lining method will be lost. Put it away.

Therefore, after lining a pipe, it is possible to make a hole in the lining material lined at the branch part and to connect the branch pipe to the main pipe without digging up the branch part of the pipe. There is a need to develop a simple method.

Conventionally, inside a pipe that has been lined, a trolley that is moved by remote control and a device that detects the branching part of the branch pipe, such as a television camera that moves together with the trolley, are placed and installed on the trolley. A method is known in which a drilling head is freely moved in the circumferential direction and radial direction inside the pipe under remote control to drill a hole in the part of the lining material that is blocking the passage to the branch pipe at the branch part. . (British Patent No. 2092493) However, the device used for this drilling necessarily requires a device that accurately detects the position of the branch port of the branch pipe on the inner peripheral surface of the lined pipe, and
A drive section for driving the drilling head is also required, making the entire device extremely complex. Therefore, such devices and methods cannot be applied to pipes with bends or small diameter pipes.

Further, as a method for drilling a hole in the lining material at a branch point without digging up the pipe after the lining material has been attached to the pipe, for example, the method disclosed in Japanese Patent Laid-Open No. 55-41274 is known. In this method, after a lining material is attached to the inner surface of the conduit, this through-hole having a flexible conduit that penetrates through the center of the through-hole and extends rearward is inserted into the branch pipe, and then pressure is The flexible conduit is guided to the branch opening while drawing out the gas in the branch pipe at the front of the insertion mass through the flexible conduit, and the hot air from the flexible conduit is applied to the attached lining. This method involves spraying the material onto the material, melting the lining material, and drilling holes.

Another known method is the method described in Japanese Unexamined Patent Publication No. 58-49211. In this method, before installing the lining material, the branch port of the pipe is closed with a plug, and after the lining material is installed, the plug is used as a heating device to generate heat, and the installed lining material is plugged. The glued part is melted and a hole is made.

In both of the above two conventional techniques, the inserted lump or plug is advanced by fluid pressure and positioned at the branching part. Reaching the bifurcation is extremely difficult.

Furthermore, in the method disclosed in Japanese Patent Application Laid-Open No. 55-41274, it is not easy to make holes because the holes must be made using hot air, and moreover, when bonding the lining material to the inner surface of the pipe, some of the adhesive branches out. It flows into the pipe and hardens, and it is extremely difficult to melt and drill the hole including this.

Furthermore, in the method disclosed in Japanese Patent Application Laid-open No. 55-492111, it is necessary to attach a stopper to the branch part in advance before installing the lining material. This is not an easy task, and it has the disadvantage that it cannot be applied to pipes that have been lined.

In view of such circumstances, the present inventors first connected a compressible second coil spring that is sufficiently flexible to the tip of the first flexible coil spring, and An electric heater is installed at the tip of the pipe, the first coil spring is rotated and sent into the pipe, and the electric heater is placed at the branch part and energized to burn out the lining material and perforate it. It can be applied to pipes where the material has been completed, and it can be easily inserted into branch parts through small diameter and bent branch pipes, and a large amount of adhesive can flow into the branch pipes. We devised a drilling tool that can easily drill holes even in branch pipes such as those that are closed (Utility Model Application No. 61-39400).

However, in this invention, the first coil spring is fed in while rotating, and the electric heater at the tip is swung around due to the elasticity of the second coil spring. The heater becomes wedged between the end of the straight pipe and the fitting, and the weak second coil spring is buckled and damaged, making it impossible to insert it any further. is coated with thermoplastic resin to form a roughly cone-shaped block.
A device was devised in which this was installed at the tip of the second coil spring (Utility Application No. 18915, 1983).

However, in the invention of Utility Application No. 60-18915, since the electric heater is coated with thermoplastic resin and its side surfaces are sloped,
It is possible to move smoothly through the branch pipe along the curve of the pipe while avoiding obstacles such as steps and burrs such as LM joints, but the electric heater that reaches the branch does not operate even when energized. This situation often occurred.

The disconnection of the current-carrying wire, which is the cause of this situation, is a phenomenon within the resin coating or coil spring, so it is difficult to tell at a glance, but it is caused by the current-carrying wire being twisted and broken.

[Purpose of the invention]

The present invention aims to solve the problems of the prior art as described above, and has a shape in which the electric heater moves smoothly along the pipe, and
The present invention aims to provide a new punching tool that has been devised regarding the condition of the current-carrying wire extending rearward from the electric heater.

[Disclosure of the invention]

The present invention solves the problems of the prior art as described above, and the punching tool for the pipe lining material according to the present invention has a coil tension spring with a spring constant smaller than the spring constant of the tension coil spring. A compression coil spring having a spring constant is connected to the tip of the compression coil spring, and a frustum-shaped head body made of an electric heat generating means coated with a thermoplastic resin is connected to the tip of the compression coil spring, and the head body is connected to the heat generating means. one or more current-carrying wires are inserted in the tension coil spring and the compression coil spring in a relaxed state; It is fixed to the spring at a plurality of locations, and is characterized in that a device is provided at the rear of the tension coil spring to rotate and send out the coil spring.

The present invention will be explained below with reference to the drawings. FIG. 1 shows an embodiment of the drilling tool of the present invention. In FIG. 1, a device N (not shown) is provided at the rear end of the tension coil spring 1 to rotate and feed out the coil spring. As this device N, a commercially available drain cleaner or the like can be used. Since this coil spring 1 is operated from the rear by the above-mentioned delivery device and moves through a small diameter pipe, it is not preferable that it be excessively flexible.

In FIG. 1, another compression coil spring 2 is connected to the tip of the tension coil spring 1 via a compression coil spring 4, but the tension coil spring 1 is directly compressed without going through the compression coil spring 4. A coil spring 2 may be connected (that is, FIG. 1 shows an embodiment according to claim 4). The compression coil spring 2 is a sufficiently flexible compression coil spring that has approximately the same diameter as the head body 5 described later and has a spring constant smaller than that of the tension coil spring 1 described above. The compression coil spring 4 has a spring constant intermediate between that of the tension coil spring 1 and the compression coil spring 2, and has an intermediate flexibility.

A head body 5 is attached to the tip of the compression coil spring 2. The head body 5 has an electric heating means 3 at its center.
For example, it has an electric heater, and the periphery of the heating means 3 is covered and wrapped with thermoplastic resin 6, so that the entire body is shaped like a block. The head body 5 has an outer diameter that is slightly smaller than the minimum inner diameter of the conduit into which the instrument is to be inserted.

As the electric heating means 3, for example, a nichrome hot plate or a coil 7 of relatively thick wire is used. Further, as the thermoplastic resin 6, an elastic thermoplastic resin such as polyurethane resin, soft vinyl chloride resin, EVA resin, etc. is used. The electric heating means 3 is covered with this resin and molded into a truncated cone-shaped block to form the head body 5.

The outer end of the hot plate or hot wire 7 of the electric heating means 3 is connected to the compression coil spring 2 and the compression coil spring 4.
The tension coil spring 1 is electrically connected to the tension coil spring 1 through the heating plate or the heating wire 7, and an energizing wire 9 is connected to the inner end of the hot plate or the hot wire 7 via a screw 8. It is inserted into the spring 4 and the tension coil spring 1 in a sufficiently relaxed state and extends rearward. This state can be achieved by inserting the current-carrying wire 9 through the coiled spring in a stretched state, then winding the coiled spring into a circle, and then stretching the coiled spring. This current-carrying wire 9 is inserted in a relaxed state within the compression coil spring, and is fixed to the tension coil spring 1 at appropriate intervals within the tension coil spring by an appropriate method. In the case of this embodiment, if the coil spring is stretched out on the table and the current-carrying wire 9 is inserted through it, and then the coil spring is wound round, the valley of the spring opens, and the thermoplastic resin 10, for example,
By injecting EVA resin and then cooling it, the current-carrying wire 9 can be easily fixed within the tension coil spring 1.

Next, another embodiment in which a plurality of energizing wires 9 are inserted into the coil spring will be described with reference to FIG.

11 is a thermocouple as a heat detection means. The thermocouple 11 is attached to the front surface of the head body 5 made of thermoplastic resin 6 molded into a block shape, and one lead wire 12 drawn out from the thermocouple 11 is connected to the It is electrically connected to the tension coil spring 1 via the compression coil spring 2 and the compression coil spring 4, and the other lead wire 13 is inserted into the compression coil spring 2, the compression coil spring 4, and the tension coil spring 1. , extending backwards.

14 is a proximity switch used to confirm that the electric heater 3 has reached a branch point. This proximity switch 14 is provided between the compression coil spring 2 and the compression coil spring 4, and has a groove 16 formed on the outer periphery of a cylindrical body 15 made of synthetic resin.
A coil 17 of enamelled wire is formed at 6,
A protective tube 18 is fitted around the outer periphery of the coil 17. The lead wire 19 of the coil 17 passes through the compression coil spring 4 and the tension coil spring 1 and is drawn out rearward.

In this example, electric heater 3, thermocouple 1
The current-carrying wires or lead wires 9, 13, 19 of the proximity switch 1 and the proximity switch 14 are placed in a braided state 23 in advance, and are inserted into the coil spring so that they are sufficiently relaxed within the coil spring. It can be set to 24. The current-carrying wires or lead wires 9, 13, 19 are fixed within the tension coil spring in the same manner as in the previous embodiment.

In both the above-mentioned embodiment and this embodiment, the coil spring 1 and the current-carrying wire 9 are connected to a power source, as well as a device N provided at the rear end of the tension coil spring 1 for rotating and feeding out the coil spring. The electric heater 3 can be energized.

Further, the potential difference generated in the thermocouple 11 is detected by a temperature detector, and the device that rotates and feeds out the tension coil spring 1 is immediately stopped. Similarly, the proximity switch 14
When an impedance change is detected by an amplifier incorporating a high frequency oscillation circuit and an impedance change detection circuit, the device N that rotates and feeds out the tension coil spring 1 is immediately stopped. .

In each embodiment, the connection between each coil spring is
The connector terminal 22 can also be used to connect and disconnect the current-carrying wires inserted into each coil spring. In this case, the shape, mechanism, electrical system connection, and engagement of the connector can be arbitrarily selected.

In order to insert the drilling tool of the present invention into a branch pipe, the head body 5
The distal end provided with is inserted from the end of the branch pipe, and the tension coil spring 1 is sent out while rotating.

When the tension coil spring 1 rotates, the other compression coil spring 2 also rotates via the compression coil spring 4, and since the compression coil spring 2 is sufficiently flexible than the tension coil spring, it is shown in FIG. The compression coil spring 2 is swung as if shaking its head. Therefore, at the bent part of the conduit, the head body 5
moves smoothly along the bend while searching for the direction of the bend. In addition, since the head body 5 coats the electric heater 3 with thermoplastic resin 6 and has an inclined side surface, the head body 5 avoids the end of a straight pipe or an end stop in a LM joint, etc. It moves smoothly inside the branch pipe along the bend.

At that time, a rotational force is simultaneously applied to the current-carrying wire inserted into the coil spring, but since the coil spring and this current-carrying wire are pulled and fixed at appropriate intervals within the coil spring, the current-carrying wire is The rotational force is transmitted to the tip in the length direction.

In addition, since the current-carrying wire is inserted into the coil spring in a relaxed state, even if the coil spring is stretched each time it passes through a bend in the tube, the current-carrying wire will not be cut. The coil spring and the current-carrying wire are inserted into the branch pipe without any damage (FIG. 4).

When the head body 5 reaches the branch part 25 of the branch pipe (Fig. 5), the rotation and feeding of the tension coil spring 1 is stopped, and the head body 5 is moved by the elasticity of the compression coil spring 2 as shown in Fig. 5. Press it against the lining material A that is blocking the conduit of the branch pipe at the branch part. When the switch is turned on in this state, electricity is applied to the hot plate or hot wire 7, the electric heater 3 generates heat, and the thermoplastic resin 6 covering it melts. Then, the lining material A is melted by the weight of the head body 5, the elasticity of the compression coil spring 2, and the heat generated by the electric heater 3, and a hole is formed (FIG. 6). Switch 35 and power supply 34 are shown in FIGS.

In the punching tool of the present invention, a thermocouple 11 is provided on the front surface of the head body 5, and the head body 5 can be pressed against the lining material at a branch point while the lining material A is being heated, or the back of the head body 5 can be Proximity switch 14 provided in
This makes it possible to confirm the perforation, and in this case, these current-carrying wires 9 or lead wires should be put in a braided state 23 (see Figures 2 and 7) and inserted into the coil spring. By leaving it in place, it is possible to impart a uniform relaxed state to the current-carrying wire 9 and the like. In this way, the current-carrying wires 9 and the like are not subjected to stretching or the like separately, and even if a twisted state occurs, they can easily return to their original state. In one embodiment of the present invention, when the thermocouple 11 is provided on the head of the head 5, when the head comes into contact with the outer surface of the lining material blocking the branch pipe conduit (see Fig. 5). ), the thermocouple 11 detects the heat of the lining material (which is heated), and the temperature detector detects the potential difference (electromotive force) generated between the lead wires 12 and 13. The tension coil spring is transmitted to a device capable of rotating and feeding out the tension coil spring, and by transmitting the potential difference, the rotation and feeding of the tension coil spring can be stopped. An electrical circuit is installed. An example of such an electrical circuit is shown in FIG. 8. Referring to FIG. 8, the temperature sensor 31 detects the above potential difference, thereby
The normally closed switch 32 of the motor 36 is opened to stop driving the motor 36, and the normally open switch 33 of the electromagnetic brake 39 is closed to operate the electromagnetic brake 39 and stop the rotation of the shaft 37.
The rotation of the rotating delivery device is stopped via the belt 38, and the rotation and delivery of the tension coil spring 1 are stopped. As a result, the head 5 of the drilling tool is held in pressure contact with the lining material at the branching point. Further, in one embodiment of the present invention, the proximity switch 1
4, before lining the main pipe, insert the drilling tool of the present invention from the end of the branch pipe toward the branch, and before lining the main pipe,
This is used when the tip of the drilling tool of the present invention, that is, the head body 5, is placed in advance at a predetermined position of a branch point. In that case, before performing the lining work, the punching tool of the present invention is inserted and advanced from the end of the branch pipe toward the branch part, but at this time, the proximity switch 14
Proceeds close to the inner surface of the branch pipe, so when a high-frequency current is passed from the high-frequency oscillation circuit of the amplifier 31 (see Fig. 8) to the coil 17, the impedance generated there is constant. There is no change. When the tip of the punching tool of the present invention reaches the branch point, advances further and enters the main pipe from the branch pipe, and the part where the proximity switch 14 is installed also enters the main pipe, there are The impedance of the coil 17 changes because the pipe wall of the branch pipe that was previously used is removed. An electrical circuit is provided so that rotation and delivery of the tension coil spring can be stopped by a change in its impedance. An example of such an electric circuit can be explained using FIG. 8. To explain using FIG. 8, the above change in impedance is detected by the amplifier 31,
As a result, the normally closed switch 32 to the motor 36 is opened and the energization is stopped, and the normally open switch 33 to the electromagnetic brake 39 is closed and the electromagnetic brake 39 is energized. As a result, the rotation of the shaft 37 is stopped, and the rotation and feeding of the tension coil spring 1 is stopped. As a result, the advancement of the drilling tool is stopped immediately after the part provided with the proximity switch 5 enters the main pipe.

Next, by reversing the rotation of the rotary transfer device N and pulling back the tension coil spring 1 by a length corresponding to the length from the proximity switch 5 to the head body 5,
The head body 5 housing the electric heater 3 can be accurately placed at a predetermined position at the branch point.

After that, the lining material is crimped onto the main pipe to line it.

Due to the lining of the main pipe, the opening of the pipe to the branch pipe is blocked by a tensile material, and the state at that time is as shown in FIG. 5.

Further, in an embodiment of the punching tool of the present invention, a change in the rotational speed of a rotating body of a device that can send out the tension coil spring while rotating is electrically detected, and An electric circuit can be provided for a device capable of rotating and delivering a coil spring so as to be able to stop the rotation and delivery of the tension coil spring by transmitting a signal. An example of such an electrical circuit is shown in FIG. Explaining with reference to FIG. 9, in the one shown in FIG. 9, a reflective tape 40 is attached to a part of a rotating body R of a device N that rotates and sends out a tension coil spring 1. A photoelectric switch 41 as a non-contact output switch is provided adjacent to the rotation path of the switch 40 . The photoelectric switch 41 is connected to a motion detector 42, reads the signal from the photoelectric switch 41 as a pulse, and measures the interval between the pulses. When this interval becomes a predetermined length or more, a normally closed switch 32 in a circuit that energizes the motor 36 is opened, while a normally open switch 33 in a circuit that energizes the electromagnetic brake 39 is closed. When such a punching tool of the present invention is inserted into a branch pipe and advanced, its tip may hit a step in the pipe, or hit the lining material A already lined at the branch. When pressed (see FIG. 5), the rotation of the tip, that is, the head body 5, is extremely reduced and the advancement is stopped. However, the tension coil spring 1 continues to rotate, and the compression coil spring 2 is thereby strongly twisted. Therefore, due to the resistance of the compression coil spring 2, the tension coil spring 1
The rotation of is decelerated, and accordingly, a load is applied to the rotating body R, and its rotation is also decelerated.

As a result, the frequency with which the photoelectric switch 41 detects the reflective tape 40 decreases, and the motion detector 4
The interval between pulses in 2 becomes larger. When the interval becomes larger than a predetermined length, the motion detector 42 issues a signal to open the normally closed switch 32 of the motor circuit to stop the power supply to the motor 36, and also to open the normally open switch 3 of the electric brake circuit.
3 is closed and the electromagnetic brake 39 is activated to stop the rotating shaft 37 from rotating.

As a result, the rotation of the rotating body R is immediately stopped, the rotation and feeding of the tension coil spring 1 is also stopped, and no further twisting of the compression coil spring 2 occurs.

According to the punching tool of the present invention, since no fluid pressure is used, no back pressure is applied, and even in branch pipes with many bends, the current-carrying wire does not get twisted and can be inserted extremely easily. I can do it.

Moreover, even when the tube is bent upward, the current-carrying line will bend in the direction of the bend.
can enter. Furthermore, even if there are steps or obstacles in the branch pipe, they can be smoothly avoided, making insertion easier.

Furthermore, when a braided current-carrying wire is used, a uniform relaxed state can be easily obtained within the coil spring, and it is possible to untwist it, so that the force applied to the current-carrying wire can be borne by the entire braid.

In addition, when drilling into the lining material mentioned above, the perforation ability of the electric heater may be greatly reduced when reusing it due to the burnt residue of the lining material and adhesive. By connecting the coil springs with connector terminals, their replacement becomes easy. Furthermore, by using a cartridge system for each member, each member can be replaced extremely conveniently. Furthermore, if a bundle of wires that are thinner than the current-carrying wires in the tension coil spring is used as the current-carrying wire in the compression coil spring, the flexibility of the compression coil spring will not be impaired.

[Brief explanation of drawings]

1 and 2 are central vertical cross-sectional views showing one embodiment of the punching tool of the present invention, respectively. FIG. 3 is a diagram showing a state in which the drilling tool of the present invention moves forward while rotating. FIG. 4 is a diagram showing a state in which a part of the coil spring of the punching tool of the present invention has passed through the bent part of the tube. FIG. 5 is a diagram showing a state in which the tip of the punching tool of the present invention is pressed against the lining material A at the branched portion. FIG. 6 is a diagram showing a state in which the lining material A is perforated. FIG. 7 is a diagram showing an example of a state in which the current-carrying wire is braided in the punching tool of the present invention. FIG. 8 is a diagram showing an example of an electric circuit when a thermocouple is provided in the head of the drilling tool of the present invention,
Alternatively, one of the electric circuits when a proximity switch is provided in the compression coil spring of the drilling tool of the present invention.
It is also a diagram showing an example. FIG. 9 shows a device for rotating and feeding out the tension coil spring to the rear part of the tension coil spring in the drilling tool of the present invention.
It is a figure which shows an example of the electric circuit when the means to electrically detect the change of the rotational speed of the rotating body is provided. 1... Tension coil spring, 2... Compression coil spring, 3... Electric heating means (electric heater), 4
... Compression coil spring, 5 ... Head body, 6 ... Thermoplastic resin, 9 ... Current-carrying wire.

Claims (1)

[Claims] 1. A compression coil spring having a spring constant smaller than the spring constant of the tension coil spring is connected to the tip of the tension coil spring, and an electric heating means is connected to the tip of the compression coil spring. A truncated conical head covered with a plastic resin is connected to each other, and one or more current-carrying wires connected to the heating means are relaxed in the tension coil spring and the compression coil spring. The above-mentioned energizing wire is inserted into the tension coil spring in a state in which it is fixed at multiple points in the tension coil spring, and the coil is inserted into the rear part of the tension coil spring. A drilling tool for a pipe lining material, characterized in that it is equipped with a device that can send out a spring while rotating it. 2. A piercing tool for a pipe lining material according to claim 1, wherein the relaxed state of the plurality of current-carrying wires is created by braiding the current-carrying wires. . 3. A piercing tool for a pipe lining material according to claims 1 and 2, wherein the current-carrying wire is fixed to the tension coil spring using a thermoplastic resin. 4. The compression coil spring is formed by connecting two compression coil springs with different spring constants, and the spring constant of the compression coil spring connected to the tension coil spring is equal to that of the other compression coil spring. Claims 1 to 3 have an intermediate value between the constant and the spring constant of the tension coil spring.
Punching tools for pipe lining materials as described in each section. 5. The tube according to each of claims 1 to 4, wherein the connection of each spring is made detachable by a connector terminal, including the connection and disconnection of a current-carrying wire inserted into each spring. Perforator for road lining material. 6. A piercing tool for a pipe lining material according to each of claims 1 to 5, wherein the truncated conical head is connected to a compression coil spring in a cartridge type manner. . 7. A piercing tool for a pipe lining material according to each of claims 1 to 5, wherein the member extending from the head body to the connecting portion of each spring is in the form of a cartridge.