JPH11179804A - Seal packing and tube end treatment method in reverse sealing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the airtightness of a piping end after the repair by the reverse sealing method. SOLUTION: A channel 33 in the circumferential direction is formed on a bonding face 32 constituting a sealing material end of a seal packing 3. Creases on a sealing material end at the time of fitting the seal packing 3 are absorbed by the arrangement, and a clearance between the sealing material and a piping inner peripheral face formed by the creases remains in the seal packing 3 so that the clearance generates no defects of the airtightness of the seal packing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to repairing a pipeline by inserting a cylindrical sealing material into the inner surface of an aged pipeline while inverting the sealing material and bonding the sealing material to the inner surface of the pipeline. The present invention relates to a seal packing for sealing an end portion of a seal material in a reversal sealing method to be performed, and a pipe end processing method in the reversal sealing method including mounting of the seal packing.

[0002]

2. Description of the Related Art There is known a method of repairing a buried pipe such as a gas pipe or a sewage pipe buried in the ground, in which the pipe is repaired by lining the inner surface thereof in an existing state. Have been.

[0003] In this method of repairing a pipeline, a sealing material in which an uncured curable resin is impregnated into a flexible tubular member whose outer peripheral surface is covered with a highly airtight film is applied by a fluid pressure. The seal is pressed against the inner peripheral surface of the pipeline while it is inserted into the pipeline while being inverted, and the curable resin impregnated in the seal is cured as it is, and the inner lining of the pipeline is repaired. A reversal sealing method to be applied is known.

In this reversal sealing method, after the sealing material is adhered to the inner peripheral surface of the conduit, the end of the sealing material and the inner peripheral surface of the conduit are caused by curing contraction or thermal contraction of the sealing material. There is a gap between them, and this gap has a problem that the airtightness of the repaired pipeline is impaired. To deal with this, a seal packing is attached to the end of the sealing material and the Tube end treatment to ensure airtightness is applied.

Referring to FIG. 7, a description will be given of a conventional technique relating to a seal packing used in the above-described pipe end processing and a method of the pipe end processing.

FIG. 1A is a front view of a repaired pipeline viewed from a pipe end, and FIG. 2B is a cross-sectional view taken along the line XX 'at the pipe end of the repair pipeline. The sealing material 2 applied by the above-described reversal sealing method is adhered to the inner peripheral surface of the pipe 1. Then, in order to bring the end of the sealing material 2 into close contact with the inner peripheral surface of the conduit, a flat seal packing 3 is used.
Is installed over the entire circumference of the pipeline so as to cover the end of the sealing material 2. The seal packing 3 has a part of the bonding surface covered on the end of the sealing material 2 and the other part of the bonding surface directly bonded to the inner peripheral surface of the pipeline. Sealing agents 5a, 5b, 5c are applied to the ends of the seal packing 3. Furthermore, a steel pipe end ring 4 is adhered on the seal packing 3, and the seal packing 3 is pressed through the pipe end ring 4.

[0007]

In the above-mentioned prior art,
When wrinkles occur at the end of the sealing material 2 when the sealing material 2 is applied to the inner surface of the pipe by the reverse sealing method,
In the process of attaching the flat seal packing 3 to the end of the sealing material 2, the sealing packing 3 does not uniformly press the sealing material end. Of the sealing material 2 to form an overlapped portion. Then, it has been confirmed that a gap is formed in the bonding surface between the seal member 2 and the seal packing 3 due to the overlapping portion, and a leak occurs in the pipe line which should have been repaired.

This phenomenon occurs remarkably when the seal packing 3 is not pressed uniformly over the entire periphery against the end of the seal material 2. Conventionally, when the seal packing 3 is pressed, In some cases, uniform tension cannot be ensured, and there is a problem that the above-described leakage is likely to occur after construction.

In addition, in the reversal sealing method, although there is a problem that leakage is likely to occur at the end of the pipeline as described above, the airtightness of the end of the pipeline including the seal packing 3 after the construction is completed. However, there has been a problem that a method for easily confirming the construction has not been established, and the quality of the construction cannot be immediately confirmed.

The present invention has been proposed in order to cope with such circumstances, and it is an object of the present invention to secure the airtightness of a pipe end after repairing by a reversal sealing method. Even when wrinkles occur at the ends of the sealing material in the sealing method, the structure of the seal packing that ensures sufficient airtightness at the ends, and the pipe end treatment method in the reversal sealing method including the installation of the seal packing, and further, An object of the present invention is to provide a pipe end processing method in a reversal sealing method including an airtight test in which the airtightness of only the pipe end can be easily confirmed.

[0011]

In order to achieve the above-mentioned object, the present invention provides, as a first invention, a method in which a sealing material is attached to an end of a sealing material in order to ensure airtightness at the end of the sealing material in a reversal sealing method. With respect to the structure of the seal packing, the surface covering the end of the seal material and the surface directly adhered to the inner peripheral surface of the pipeline have an adhesive surface that forms a step having a height corresponding to the thickness of the seal material, A groove extending in the circumferential direction is formed on a surface covering the end of the sealing material.

[0012] The second invention also relates to a structure of a seal packing, and a height corresponding to a thickness of the seal material is provided by a surface covering the end portion of the seal material and a surface directly adhering to the inner peripheral surface of the pipeline. And a mesh-shaped unevenness is formed on a surface covering the end of the sealing material.

A third aspect of the present invention is characterized in that the seal packing is formed in a ring shape.

According to a fourth aspect of the present invention, there is provided a pipe end treatment method in the reversal sealing method using the seal packing, wherein the seal packing is adhered to the end portion of the sealing material and the inner peripheral surface of the pipe line. A step of bonding a ring member from above the seal packing, a step of providing several tension jigs in the circumferential direction for pressing the ring member toward the inner peripheral surface of the pipe, and a step of securing the tension of the seal member; A step of expanding the diameter of the member and bringing the seal packing into close contact with the end portion of the seal material and the inner peripheral surface of the conduit.

According to a fifth aspect of the present invention, there is provided a method of performing an airtightness test of a pipe end portion following the above-mentioned pipe end treatment method, wherein the airtightness test includes mounting a first airtight plug on the sealing material and Attach a second airtight stopper to the end of the inner peripheral surface of the conduit,
The method is characterized in that the space including the seal packing sandwiched between the first and second hermetic plugs is pressurized to confirm that the pressure is maintained.

[0016]

In the first and second aspects of the present invention, by forming circumferential grooves or mesh-like irregularities on the adhesive surface covering the seal material end of the seal packing, wrinkles at the seal material end when the seal packing is mounted. Is absorbed by the grooves or irregularities. As a result, the gap between the seal material formed by the wrinkles and the inner peripheral surface of the pipeline stops in the seal packing, and does not become a gap that causes a defect in the airtightness of the seal packing. And, as specified as the third invention, by forming the seal packing into a ring shape, the action of closing the gap formed by the wrinkles as described above in the seal packing can be further enhanced.

In the pipe end treatment method according to the fourth invention, when the seal packing is pressed against the seal end, wrinkles at the seal end are reduced by using a ring member and a plurality of tensioning jigs arranged in the circumferential direction. This is provided with a step of evenly stretching, thereby preventing wrinkles from concentrating at one place and forming a large overlapping portion. The airtightness of the pipe end can be further enhanced by combining with the structure of the seal member described above.

In the fifth invention, after a series of steps of attaching the seal packing to the end of the sealing material, it is possible to perform a partial airtight test only on the end, which is simple. The airtightness of the pipe end can be confirmed by the method.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings (the same parts as those in the prior art are denoted by the same reference numerals, and a part of the description will be omitted).

FIGS. 1 and 2 are partial cross-sectional views of a seal packing in a reversal sealing method according to an embodiment of the present invention. The seal packing 3 is a rubber ring-shaped member having an adhesive surface formed on the surface thereof. An adhesive surface 31 that adheres directly to the inner surface of the pipeline and an adhesive surface 32 that adheres on the seal material have a step. h. This step h corresponds to the thickness of the sealing material.

In the embodiment shown in FIG. 1, a concave groove 33 extending in the circumferential direction is formed on the bonding surface 32 bonded on the sealing material.
Are formed in a plurality of places in parallel. As shown in FIG. 7B described above, this seal packing 3
It is mounted so as to cover the end of the sealing material and is pressed against the inner surface of the pipe.
The wrinkles at the end of the sealing material are
It is less likely that the gap between the sealing material and the inner surface of the pipeline caused by the wrinkles absorbed by the gasket will continue to the outside of the seal packing 3. Therefore, according to the seal packing 3, the airtightness of the end of the sealing material can be further improved.

Further, in the embodiment shown in FIG. 2, a mesh-shaped concave and convex groove 34 is formed on the bonding surface 32 which is bonded onto the sealing material. When the seal packing 3 is attached so as to cover the end of the seal material and is pressed against the inner surface of the pipe, wrinkles at the end of the seal material are finely divided by the concave / convex grooves 34, and the wrinkles overlap and the seal material and the pipe are overlapped. The gap with the inner surface of the road is not increased. Therefore, the seal packing 3 can further improve the airtightness of the end of the sealing material.

Next, a pipe end processing method in the reversal sealing method using the above-described seal packing 3 will be described.

In FIG. 3, first, a seal packing 3 is attached to an end of the pipeline 1. As described in the prior art of FIG. 7, the seal packing 3 has a seal material end and a pipe so as to partially cover the end of the seal material lined on the inner peripheral surface of the pipe line 1 by the reverse sealing method. It is bonded to the inner peripheral surface of the road 1.

In the next step, a pipe end ring 41 and a C-shaped enlarged ring 42 formed by cutting, welding or the like using SS41 steel material are adhered from above the seal packing 3. A silicone-based adhesive is applied to each of the pipe end ring 41 and the expanded ring 42 to secure even tension in the circumferential direction of the seal packing 3 and to ensure smooth movement of the expanded ring 42 on the pipe end ring. I do.

In the next step, the tensioning jig 6 is mounted on the expanding ring 42 at a plurality of positions in the circumferential direction. Tension jig 6
As shown in FIG. 4, a U-shaped steel material 61 and a screw portion 62
And a pressure contact member 63 attached to the screw portion 62. By mounting the tensioning jig 6 at a plurality of locations in the circumferential direction, the pipe end ring 41 and the enlarged diameter ring 42 are evenly pressed onto the seal packing 3, Thereby, the tension at the end of the sealing material to which the seal packing 3 is attached is ensured.

In the next step, the pressure expanding tool 8 is operated to expand the diameter of the diameter expanding ring 42 so that the seal packing 3 is brought into close contact with the end of the sealing material and the inner peripheral surface of the pipe 1. The pressure expanding tool 8 is configured such that the arms 82 on both sides are expanded by rotating the central operating portion 81, and the expanding portion 42 is rotated by operating the operating portion 81 with an appropriate torque value of about 300 kg · cm. The diameter is enlarged.

According to such a pipe end processing method, a ring member consisting of a pipe end ring 41 and an enlarged ring 42 is mounted on the seal packing 3, and the tension jig 6 is moved from above the enlarged ring 42 in the circumferential direction. By providing a process of mounting at a plurality of locations, uniform pressure acts in the circumferential direction of the seal packing 3 to press the wrinkles at the ends of the sealing material from above. And forming a large gap on the inner surface of the conduit. In this case, since the seal packing 3 is provided with the concave groove 33 or the mesh groove 34 on the bonding surface 32 on the sealing material as shown in FIGS. Alternatively, the action of the mesh groove 34 is added, and the treatment of the pipe end with high airtightness is enabled.

Referring to FIG. 5, another embodiment of the pipe end processing method in the reverse sealing method will be described. In this embodiment, only the pipe end is subjected to a partial airtight test after the pipe end processing method described above.

This airtight test is performed by attaching an airtight test jig 7 to the end of the pipe 1. According to this, the first hermetic plug 71 is mounted on the sealing material 2 in the pipeline 1 and the second hermetic plug 72 is mounted on the end of the inner peripheral surface of the pipeline 1, and the first and second hermetic plugs are mounted. Pressure is supplied from a compressor 74 to a space including the seal packing 3 sandwiched between the airtight plugs 71 and 72 through a pressure supply hole 73. Then, after the space is brought into an appropriate pressurized state, the pressurization is stopped, and the pressure gauge 75 confirms that the pressure does not decrease. As an example, it is confirmed that there is no leakage by holding for 10 minutes under a pressure of 0.33 MPa.

According to this embodiment, after a series of steps of attaching the seal packing 3 to the end of the sealing material 3, it is possible to perform a partial airtight test only on the end of the pipeline 1. The airtightness of the end of the pipe 1 can be confirmed by a simple method.

FIG. 7 is an explanatory view showing an example of the airtight test jig 7 described above. The airtight test jig 7 includes an inner pipe member 76,
An outer tube member 77, a spacer member 78, an operation screw 79, and a connection hole 80 are included. The inner pipe member 76 is a hollow tubular member having a flange portion 76a formed at the front end and an open rear end, and a connection hose 80 connected to the compressor 74 and the pressure gauge 75 in FIG. Is done.
The outer pipe member 77 is a tubular member which is slidably mounted on the inner pipe member 76 and has a flange portion 77 a formed on the distal end side.
Slide up. The spacer member 78 is a tubular member having flange portions 78a and 78b formed at both ends, and is slidably mounted on the inner tube member 76. The first and second hermetic plugs 71 and 72 are annular members made of rubber.
a, and the second hermetic plug 72 is connected to the flange portion 7 described above.
8b and 77a, respectively.

FIG. 6A shows a state in which the airtight test jig 7 is inserted into the end of the pipe. The airtight plugs 71 and 72 are both reduced in diameter with a sufficient space between the flanges 76a and 78a and between the flanges 78b and 77a. The outer diameters of the flanges 76a and 78a and the first hermetic plug 71 are formed so as to be insertable into the depth of the pipeline via the seal packing 3, and the outer diameters of the flanges 78b and 77a and the second hermetic plug 72 are formed. The outer diameter is formed to be slightly smaller than the inner diameter of the conduit 1.

FIG. 6B shows a state in which the airtight test jig 7 is inserted into the end of the pipe to press around the seal packing 3. By rotating the operation screw 79, the outer tube member 77 is slid in the distal direction, and the flange portion 76
a and 78a and between the flanges 78b and 77a. As a result, the first and second airtight stoppers 71,
The outer diameter is expanded by being compressed, and the inner space is tightly fitted to the inner peripheral surface of the sealing material and the inner peripheral surface of the pipe, respectively, to seal the surrounding space including the seal packing 3. In this state, pressure is supplied from the connecting hose 80 to pressurize the above-mentioned closed space from the long hole 76b of the inner pipe member 76 through the pressure supply hole 73 formed in the spacer member 78.

[0035]

Since the present invention is configured as described above,
The airtightness of the pipeline end after repair by the reversal seal method can be sufficiently ensured, and the reliability of construction can be easily confirmed by conducting a partial airtight test of only the pipeline end. can do.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a seal packing according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of the seal packing according to the embodiment of the present invention.

FIG. 3 is an explanatory view showing a pipe end processing method in a reversal sealing method according to an embodiment of the present invention.

FIG. 4 is an explanatory view showing a tension jig used in a pipe end processing method in a reversal sealing method according to an embodiment of the present invention.

FIG. 5 is an explanatory view showing a pipe end processing method in the reversal sealing method according to the embodiment of the present invention.

FIG. 6 is an explanatory view showing an airtight test jig used in a pipe end treatment method in a reversal sealing method according to an embodiment of the present invention.

FIG. 7 is an explanatory view showing a pipe end treatment method in a conventional reverse sealing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 2 Seal material 3 Seal packing 31 and 32 Adhesion surface 33 Depressed groove 34 Mesh-shaped groove 4 Ring member 41 Tube end ring 42 Large diameter ring 5a, 5b, 5c Sealant 6 Tension jig 7 Airtight test jig 8 Expanding tool

Claims (5)

[Claims] 1. A reversal sealing method for airtightly repairing the inner peripheral surface of a pipeline by inserting a flexible tubular sealing material into the pipeline while reversing the same and bonding the flexible tubular sealing material to the inner surface of the pipeline. In a seal packing attached to an end of the seal material to ensure airtightness at an end of the seal material, the seal packing is directly bonded to a surface covering the end of the seal material and an inner peripheral surface of the pipe. A sealing surface that forms a step having a height corresponding to the thickness of the sealing material, and a groove that extends in a circumferential direction is formed on a surface covering the end of the sealing material. Seal packing in the reverse seal method. 2. A reversal sealing method for hermetically repairing the inner peripheral surface of a pipeline by inserting a flexible tubular sealing material into the pipeline while reversing the same and bonding the inner cylindrical surface to the inner surface of the pipeline. In a seal packing attached to an end of the seal material to ensure airtightness at an end of the seal material, the seal packing is directly bonded to a surface covering the end of the seal material and an inner peripheral surface of the pipe. And an adhesive surface that forms a step having a height corresponding to the thickness of the seal material, and a mesh-shaped unevenness is formed on a surface that covers the end of the seal material. Seal packing in the reverse seal method. 3. The seal packing according to claim 1, wherein the seal packing has a ring shape. 4. A method using the seal packing according to any one of claims 1 to 3, wherein the seal packing is bonded to an end portion of the seal material and an inner peripheral surface of the conduit. Bonding a ring member from above, a step of providing several tensioning jigs in the circumferential direction to press the ring member toward the inner peripheral surface of the pipe, and securing tension of the seal member; and A step of enlarging the diameter of the seal gasket to bring the seal packing into close contact with the end of the seal material and the inner peripheral surface of the conduit. 5. A method for performing an airtightness test of a pipe end portion following the pipe end treatment method according to claim 4, wherein the airtightness test includes mounting a first airtight plug on the sealing material. A second hermetic plug is attached to the end of the inner peripheral surface of the conduit, and the space including the seal packing sandwiched between the first and second hermetic plugs is pressurized to confirm that the pressure is maintained. A pipe end treatment method in a reversal sealing method characterized by being performed.