JP4173586B2 - Resin pipe repair method and closure plug and tool used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing a resin pipe such as a gas pipe. In particular, the present invention relates to a method of repairing a resin pipe that can be reliably closed even if the damaged portion has a complicated shape and can be closed even when the gas pressure in the pipe is relatively high, and a closing plug and a closing tool used therefor.
[0002]
[Prior art]
When a small-scale damage occurs in the gas piping, the damaged part is closed immediately without stopping the gas flow. After that, a full-scale repair is performed by installing a bypass pipe, cutting the damaged part, and connecting a new pipe. For emergency damage closure, it is necessary to contain the gas flowing in the pipe at a pressure higher than the surroundings, and several methods are used.
[0003]
5-8 is a figure which shows the outline | summary of the emergency closing method of the conventional resin pipe | tube.
Each method will be described with reference to the drawings.
(1) As shown in FIG. 5, the damaged portion 71 (FIG. 5 (A)) of the gas pipe 70 is packed with a waste cloth 81 (FIG. 5 (B)), and the pipe circumference of that portion is wound with a tape 83. (FIG. 5C) The waste 81 is fixed to the damaged portion 71.
(2) As shown in FIG. 6, a band 85 (FIG. 6 (C)) having the same diameter as the gas pipe 70 is wound around the damaged portion, and is tightened and fixed so as to seal the damaged portion 71 (FIG. 6 (B)). ). A highly sealing material such as rubber is attached to the inner surface of the band 85.
{Circle around (3)} As shown in FIG. 7, a wooden plug 87 is driven into the damaged portion 71.
(4) As shown in FIG. 8, a saddle 89 (see FIG. 8 (A)) to which a diffusion pipe 93 is attached via a shutoff valve 91 is fixed to a damaged portion 71 by a belt 95 (FIG. 8 (C)). . Thereafter, the shut-off valve 91 is closed (FIG. 8D).
[0004]
[Problems to be solved by the invention]
The repair methods (1) to (4) described above have the following problems.
(1) The pressure in the pipe that can be closed is low because a material with low strength and tightness such as waste and tape is used. Furthermore, it is not suitable when the damaged part has a complicated shape such as a burr. In addition, a space for winding tape around the pipe is necessary, the excavation area is large, and the repair work cost is high.
(2) Not suitable when the damaged part has a complicated shape such as a burr. In addition, a space for passing the band around the pipe is necessary.
(3) Since a low-strength material is used and the fixing method is unstable, reliable sealing is impossible. Further, it is not suitable when the damaged part has a complicated shape such as a burr.
(4) Since the diffusion pipe is provided, the pressure that can be closed is higher than the method of (1), but the pressure that can be closed is absolutely low. In addition, a space for winding the belt around the pipe circumference is required.
[0005]
The present invention has been made in view of such problems, and is a method for repairing a resin pipe such as a gas pipe, which can be reliably closed even if the damaged portion has a complicated shape. It is an object of the present invention to provide a method for repairing a resin pipe that can be closed even when the gas pressure is relatively high, and a closing plug and a closing tool used therefor.
[0006]
[Means for Solving the Problems]
To solve the above problems, a method of repairing a base to become tree fat pipe of the present invention, against while rotating the resin closure stoppered Yabuana of the resin tube, occurring between the resin tube and a closed plug It is characterized by fusing both with frictional heat.
Since the piping made of resin and the closing plug are fused to connect the piping and the closing plug, the connection strength is high, and the gas pipe can be closed even when the pressure in the gas pipe is high. Furthermore, during repair work, it is only necessary to expose the broken hole (damaged part) and its periphery, and there is no need to provide a space around the pipe.
[0007]
Another method for repairing a resin pipe serving as a base of the present invention is to round a periphery of a damaged portion of a resin pipe, apply the resin stopper to the hollowed inner hole while rotating the resin pipe, It is characterized in that both are fused by frictional heat generated between the two.
Even when the damaged portion has a complicated shape due to burrs or the like and it is difficult to position the stopper plug, it is easy to apply the stopper plug by forming a round inner hole in the damaged portion in advance.
[0008]
The stopper plug used for repairing the resin pipe of the present invention preferably has a conical shape in which the fused portion with the pipe wall has a tapered shape, and the inclination angle α of the conical shape is 45 to 60 °. By making the fused portion conical, it is easy to position the stopper plug at the damaged portion of the resin pipe.
[0009]
Another embodiment of the closure plug used for repairing the resin pipe of the present invention includes a rotationally symmetric main body, a gas flow path formed in the main body, and a shut-off valve formed in the flow path. It is characterized by.
The damaged portion can be closed while the gas in the pipe is released to the outside, and the gas leakage can be reliably stopped even when the pressure in the pipe is high.
[0010]
In another embodiment of the stopper plug used for repairing a resin pipe according to the present invention, a cutting tool for cutting the pipe wall of the resin pipe is attached to the tip. Even if the damaged part has a complicated shape due to burrs or the like and it is difficult to position the stopper plug, it is possible to secure a place to apply the stopper plug by cutting the tube wall in advance. Moreover, since the new resin tube wall surface can be taken out and fused, sealing becomes stronger.
[0011]
The closing tool used for repairing the resin pipe of the present invention includes a head for mounting a resin stopper, a motor for rotationally driving the head, a casing for storing the motor and rotatably supporting the head, And a handle. Since the closure plug can be rotated at high speed, frictional heat can be generated at the contact portion between the closure plug and the resin tube, and both can be fused. In this case, the closing tool preferably has an explosion-proof structure, and can be safely operated even when the pressure in the pipe is high. Moreover, if the motor is an air motor, the risk of sparks is further eliminated.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it demonstrates, referring drawings.
FIG. 1 is a side view showing an outline of a resin pipe repair method according to an example as a base of the present invention.
[0013]
The stopper plug 10 is made of a resin such as polyethylene, and includes a cylindrical portion 11 and a conical portion 13 with a tip cut off. The cone portion 13 preferably has an inclination angle α (see FIG. 4) of 45 to 60 ° so that the gas pipe 70 can be easily positioned on the damaged portion 71.
[0014]
The closing plug 10 is rotatably and detachably attached to the closing tool 20. The closing tool 20 includes a head 21 for rotatably mounting the closing plug 10, and a motor 23 for rotating the head 21, and the motor 23 is stored in a casing 25. The head 21 is directly coupled to the motor shaft of the motor 23, and a bearing 27 is installed between the head 21 and the outer surface of the casing 25.
[0015]
In this example, an air motor having a capacity capable of rotating at 1200 to 1300 rpm is used as the motor 23. The cylindrical portion 11 of the closing plug 10 is engaged with the head 21 so as to rotate in synchronization. This engaging method may be a simple method such as a method in which the protrusion of the head 21 is engaged with a groove cut in the end face of the cylindrical portion 11. In addition, a chuck type and a screw type can also be used.
[0016]
First, the damaged portion 71 of the gas pipe 70 is excavated only in the vicinity of the portion and exposed. At this time, it is not necessary to dig up along the pipe circumference.
When performing the work, first, the closing plug 10 is attached to the head 21 of the closing tool 20. Next, the tool 20 is lifted by holding the handle 29 of the closing tool 20 and the motor 23 is rotated. Then, the closing plug 10 that rotates together with the head 21 of the closing tool 20 is brought close to the damaged portion 71 of the gas pipe 70, and the conical portion 13 of the closing plug 10 is applied so as to close the damaged portion 71 (FIG. 1A).
[0017]
At this time, since the pressure in the gas pipe 70 is higher than the outside, it is necessary to press the stopper 10 with a certain amount of pressing force. When the stopper plug 10 rotating at high speed contacts the damaged portion 71 of the gas pipe 70, frictional heat is generated between them. As the head 21 continues to rotate, the amount of heat generated increases, and when the temperature rises to near the melting point of polyethylene, which is the material of the stopper plug and gas pipe, the contact portion 73 of the stopper plug 10 and gas pipe 70 begins to melt. . Here, the diameter of the conical portion 13 of the closing plug 10 that contacts the damaged portion 71 is 60 to 80 mm. When the head 21 further rotates in a state where the contact portion 73 is melted, the melted portion of the closing plug 10 and the gas pipe 70 spreads, and both are mixed and integrated. At this time, the rotational torque of the motor 23 increases, and when the torque reaches a certain level, the rotation of the motor 23 is stopped. If the contact plug 73 between the stopper plug 10 and the gas pipe 70 is allowed to cool in this state, the stopper plug 10 is fused and fixed to the damaged portion 71 of the gas pipe 70 (FIG. 1B). Thereafter, the head 21 is removed from the closing plug 10.
[0018]
Figure 2 is a side view showing an outline of a method of repairing a resin tube according to the actual施例of the present invention.
The method for repairing a resin pipe according to this embodiment is applied particularly to repair when the pressure inside the resin pipe is high (for example, 1 to ² kgf / cm ² ).
[0019]
The stopper plug 10 is made of a resin such as polyethylene, and includes a cylindrical portion 11 and a conical portion 13 that is cut off. A hollow gas passage 15 penetrating in the vertical axis direction is provided at the center of the stopper 10. A shutoff valve 40 is fixed to the cylindrical portion 11 of the stopper 10 with a screw. The shut-off valve 40 is provided with an inner hole (not shown) that is connected to the flow path 15 of the stopper plug 10. The inner hole can be closed by turning the knob 42 of the stopper 10 by 90 °. The stopper plug 10 with the shut-off valve 40 is rotatably and detachably attached to the closing tool 20.
[0020]
The closing tool 20 includes a head 21 that rotatably attaches the shut-off valve 40 and the closing plug 10, and a motor 23 that rotationally drives the head 21. The head 21 and the motor 23 are connected via two gears 31, 31 ', and the positions of the shaft of the motor 23 and the head 21 are offset. The motor 23 and the gears 31 and 31 ′ are stored in the casing 25, and a bearing 27 is interposed between the head 21 and the casing 25.
[0021]
In the tool 20 of this example, a continuous inner hole 33 is formed in the head 21, the bearing 27, and the gear 31 'on the head side. The inner hole 33 communicates with the inner holes of the stopper plug 10 and the shutoff valve 40. Further, these inner holes pass through the inside of the casing 25 and are connected to a tube 35 extending from the casing 25. Accordingly, a flow path is formed through the closing plug 10, the shutoff valve 40, the bearing 27, the gear 31 ′, the casing 25, and the tube 35.
[0022]
When performing the work, first, the closing plug 10 and the shutoff valve 40 are assembled, and the shutoff valve 40 is opened and attached to the head 21 of the closing tool 20. Next, the handle 29 of the closing tool 20 is grasped, the tool 20 is lifted, and the motor 23 is rotated. The closing plug 10 that rotates together with the head 21 of the closing tool 20 is brought close to the damaged portion 71 of the gas pipe 70, and the conical portion 13 of the closing plug 10 is applied so as to close the damaged portion 51 (FIG. 2A). When the conical portion 13 hits the damaged portion 71, the gas leaked from the damaged portion 71 flows into the flow path 15 of the closing plug 10, and further blows out through the shutoff valve 40, the casing 25, and the inner hole 33 of the tube 35. The process of fusing the stopper plug 10 to the damaged portion 71 is the same as in the first embodiment, but the operation is always performed while the gas in the gas pipe is blown out from the tube 35. The gas continues to blow out through the flow path until the fusion is completed (FIG. 2B). When the shut-off plug 10 is fixed to the damaged portion 71 together with the shutoff valve 40, the shutoff valve 40 is manually closed to stop the gas flow through the gas flow path (FIG. 2C).
[0023]
In this embodiment, the operation can be performed while letting the gas in the pipe escape, and it is safe, and even when the pressure in the gas pipe is high, the pipe can be reliably closed.
[0024]
3 and 4 are views showing a stopper plug used in a resin pipe repairing method according to an embodiment or a reference example of the present invention. 3A is a side view, FIG. 3B is a plan view, and FIG. 4 is a side view.
Closure plug of this embodiment, in which the cutting tool is attached to the distal end, or if the damaged portion of the gas pipe is difficult to identify the damaged portion, such as burrs or cracks, is applied when the damaged portion is small.
[0025]
FIG. 3 shows a cross-shaped drill blade 60 attached to the top of the conical portion 13 of the polyethylene closure plug 10. The drill blade 60 has a conical outer shape, and a blade 63 is arranged on the pedestal 61 so as to intersect in a cross shape. A tip 65 where each blade intersects has an acute angle. The blade base 61 is fixed to the top of the conical portion 13 of the closing plug 10 with a bolt or the like. A through hole 67 is formed in the center of the base 61. A through hole 15 is also formed in the axial center of the stopper plug 10 and is connected to the hole 67 of the base 61 of the drill blade 60.
[0026]
The closing plug 10 is applied to the closing tool used in the second embodiment in which a flow path is formed. First, the tip 65 of the drill blade 60 is brought into contact with the damaged portion of the gas pipe, positioned, and the motor is rotated. Since the tip is an acute angle, positioning is easy. When the drill blade 60 is pushed into the gas pipe while rotating the motor as the motor rotates, the diameter of the penetrating hole gradually increases. Eventually, the drill blade 60 passes through the hole, and the conical portion 13 of the closure plug 10 becomes the wall surface of the hole. As described above, frictional heat is generated on the contact surface, and both are fused. Further, since the base 61 and the stopper plug 10 of the drill blade 60 are provided with a hole penetrating the center, the work can be performed while releasing the high-pressure gas in the gas pipe.
[0027]
In FIG. 4, a hole saw 50 for cutting is attached to the conical portion 13 of the polyethylene closure plug 10. The hole saw 50 is obtained by arranging a cutting blade 53 in an annular shape on the tip surface of a thin pipe-like pedestal 51 made of metal. At the center of the pedestal 51, a drill 55 is provided so as to protrude from the surrounding cutting edge 53. The hole saw 50 is fixed to the top of the conical portion 13 of the closing plug 10 with a bolt, and rotates together with the closing plug 10 when attached to the closing tool.
[0028]
At the time of work, first, the hole saw 50 is fixed to the closing plug 10 and the closing plug 10 is attached to the closing tool. In this state, the hole 55 of the hole saw 50 is applied to the damaged portion of the gas pipe, positioned, and the motor is rotated. The drill 55 passes through the wall of the gas pipe while rotating, and the position of the stopper plug is fixed. When it is further rotated, the cutting blade 53 next cuts the periphery of the penetrating portion, and an annular cut is formed. When this notch penetrates the tube wall, a circular hole centering on the penetrating part is formed. The hole has a size including a damaged portion of the gas pipe. When the hole saw 50 is pushed through the hole, the conical portion of the stopper plug comes into contact with the wall surface of the hole. During this time, the stopper plug is rotating, so that frictional heat is generated at the contact portion between the conical portion 13 of the stopper plug 10 and the hole formed in the gas pipe as described above, and both are fused. Although the stopper plug 10 is fused to the gas pipe while the hole saw 50 is fixed, it is an emergency treatment and does not cause any trouble.
[0029]
The cutting tool shown in the above example is preferably composed of an insulator such as ceramics in order to avoid discharge due to contact with a gas tube or surrounding rocks.
[0030]
The material, shape, hardness, size, etc. of the stopper plugs shown in the above examples can be selected according to the specifications of the gas pipe that requires repair and the shape and size of the damaged part.
[0031]
【The invention's effect】
In the present invention, since the resinous stopper plug is fused by generating frictional heat between the two at the damaged portion of the resin pipe such as the gas pipe, the stopper plug can be fixed securely. Further, when the gas flow path is provided in the closing plug and the closing tool, it is possible to perform the fusion work while letting the gas escape, so that it is safe and can be closed even when the pressure in the gas pipe is high. Further, by attaching a cutting tool to the closing plug, it is possible to reliably close even a damaged part having a complicated shape.
[Brief description of the drawings]
FIG. 1 is a side view showing an outline of a resin pipe repair method according to an example serving as a base of the present invention;
2 is a side view showing an outline of a method of repairing a resin tube according to the actual施例of the present invention.
FIG. 3 is a view showing a stopper plug used in a resin pipe repair method according to an embodiment of the present invention.
FIG. 4 is a view showing a stopper plug used in a resin pipe repair method according to a reference example of the present invention.
FIG. 5 is a view showing an outline of a conventional method for quickly closing a resin pipe.
FIG. 6 is a diagram showing an outline of a conventional method for quickly closing a resin pipe.
FIG. 7 is a diagram showing an outline of a conventional method for quickly closing a resin pipe.
FIG. 8 is a diagram showing an outline of a conventional method for quickly closing a resin pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Stop plug 11 Cylindrical part 13 Conical part 15 Gas flow path 20 Closing tool 21 Head 23 Motor 25 Casing 27 Bearing 29 Handle 31 Gear 33 Inner hole 35 Tube 40 Shut-off valve 42 Knob 50 Hole saw 51 Base 53 Drill 55 Cutting blade 60 Drill blade 61 Pedestal 63 Blade 65 Tip 67 Hole 70 Gas pipe 71 Damaged part 73 Contact part 81 Waste 83 Tape 85 Band 87 Wood plug 89 Saddle 91 Shut-off valve 93 Radiation pipe 95 Belt

Claims (11)

Around the damaged portion of the resin of the gas piping hollowed round, against while rotating the resin closure plug into the hole inner hollowed, you fused thereto at frictional heat generated between the resin tube and a closed plug a method of repairing a tree fat tube,
The closing plug has a hollow gas channel, and a shut-off valve is connected to the channel;
Fusing a stopper plug to the pipe wall while dissipating the gas in the resin pipe to the outside through the shutoff valve from the flow path ,
A method for repairing a resin pipe, wherein the shutoff valve is then closed . A cutting tool for cutting the tube wall of the resin pipe is attached to the tip of the closing plug,
Removing the resin pipe lesion in the tool, subsequent repair method of a resin tube according to claim 1, wherein the fusing closure plug in the tube wall. 3. The method of repairing a resin pipe according to claim 2, wherein the cutting tool is made of an insulating material. The method for repairing a resin pipe according to any one of claims 1 to 3, wherein the closing tool for rotating the closing plug has an explosion-proof structure. The fusion part with the pipe wall of the said closure plug is a conical shape with a conical tip, and the inclination | tilt angle (alpha) of a cone is 45-60 degrees, The any one of Claims 1-4 characterized by the above-mentioned. How to repair resin pipes. 6. The method for repairing a resin pipe according to claim 5 , wherein the diameter of the fused portion between the stopper plug and the pipe wall is 60 to 80 mm. The method for repairing a resin pipe according to any one of claims 1 to 6 , wherein a rotation speed of a fused portion with the pipe wall of the closing plug is 500 to 1500 rpm. A closure tool used to claim 1-7 repairing method of a resin tube according to any one,
A head for mounting a resin stopper;
A motor that rotationally drives the head;
A casing for storing the motor and rotatably supporting the head;
A casing handle,
The closing tool characterized by comprising. The closing tool according to claim 8 , wherein a hollow gas flow path is formed in a head to which the resin stopper plug is attached. Claim 9 or 1 0 closure tool according to wherein said casing has a explosion-proof structure. Claim 8, 9 or 1 0 closing tool, wherein the said motor is an air motor.

Images