JP2006077915A - Fixture for shutting off water, structure for joining pipe, and method for joining pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply join two pipes so as to minimize a level difference and a gap in the inside surface of the pipes. <P>SOLUTION: A belt-shape water cutoff material 11 having a slippery sheet laminated on one surface of a water cutoff layer is wound around the peripheries of the pipes 2, 3. A C-shape tightening band 20, which has such a flexibility and restorability that the distance between its both end portions 22 can be expanded so as to be larger than the outside diameter of the pipes, and then, can be restored to the original state, is mounted around the water cutoff material 11, and is deformed so as to have a cylindrical shape by tightening both end portions 22 of the tightening band 20. Because the water cutoff material 11 is brought into pressed contact with the pipes by means of the tightening band 20, the water-tightness and air-tightness are excellent. A tool 10 for water cutoff water having the water cutoff material 11 and the tightening band 20 can carry out not only the joint of two pipes 2, 3 but also the repair of the pipes by cutting off water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water-stopping jig used for joining pipes, a pipe joining structure, and a joining method.

For example, in a pipeline (for example, water supply or sewerage) used for water supply or drainage, when joining ends of a pair of pipes, the pipes may be fixed on both sides and cannot move. Examples of such a situation include the following cases (1) to (4).
(1) When it is necessary to join a small manhole in a shaft and a pipe when constructing a pipeline with the propulsion method.
(2) When a small manhole is newly installed in the middle of an existing pipeline.
(3) When one pipe is connected to a structure and a new pipe is connected to this pipe,
(4) When a part of the existing pipeline is removed for repair and a new pipe is inserted instead.

In this case, conventionally, for example, the construction methods listed in (a) to (c) are used.
(A) Using the exchange joint with a long swallowing allowance, once the tube is inserted into the joint to the full depth, the tube is pulled back to adjust the length and joined to another tube.
(B) The pipes are joined by covering a pair of semi-cylindrical split collars.
(C) A pipe joint (for example, a so-called dresser joint) in which a push ring is provided at both ends of the cylindrical body sleeve is inserted into the pipe, and a compression force is applied between the pair of push ring with a bolt. By adding, the tube is tightened and joined.

In addition, there is a connecting device described in Patent Document 1 as an example of a joint that abuts and joins a pair of pipes. In this coupling device, the pipe to be connected is a metal pipe, and the purpose of the pipe line is agricultural water.
JP 2001-90881 A

According to the above construction methods (a) to (c), there are the following problems.
In the case of (a), a step is inevitably generated on the inner surface of the receiving joint of the exchange joint. A step on the inner surface of the pipe is not desirable because it causes a decrease in drainage capacity and accumulation of dust. In particular, in pipes that place importance on the flow-down performance such as the main pipe of the sewage pipe, a step on the inner surface of the pipe is not allowed in principle. In the worst case, it may lead to blockage of the pipeline.
In the case of (A), it is necessary to ensure the water tightness between the split collar and the pipe while ensuring the water tightness of the contact surface between the pair of split collars, and the assembly is difficult. Further, when a behavior such as expansion / contraction or flattening occurs in the joint, the joint surface is likely to be peeled off.
In the case of (c), in order to join a pair of pipes using a dresser joint, the dresser joint is passed through one pipe in advance, the two pipes are butted together, and then the position of the dresser joint is shifted to The procedure of placing on the butt is taken. In other words, in order to pass the dresser joint through the pipe, it is necessary to expose the straight pipe part with a length that allows the dresser joint to pass from the end of the pipe, so the dresser joint can be attached after the pipes are butted together. In addition, it cannot be used unless there is a straight pipe portion having a sufficient length from the end of the pipe. Further, if attention is not paid to the method of tightening the push ring, there is a risk that the joint will be displaced. Moreover, commercially available dresser joints are very expensive.

  In the case of the coupling device described in Patent Document 1, if the tube is a metal tube as exemplified in the document, deformation of the tube is not considered to be a problem even if a sufficient tightening force is applied. However, when applied to plastic pipes such as polyvinyl chloride pipes that are frequently used in water and sewage, etc., if the tightening force is too weak, there is a risk of water leaking from the gap between the tubes, and conversely, the tightening force is too strong. However, the tube is flattened, and there is a possibility that water leakage may occur. For this reason, it is difficult to ensure sufficient water tightness and air tightness required for water and sewage.

  The present invention has been made in view of the above circumstances, and provides a water-stopping jig that is easy to construct and excellent in water tightness and air tightness, and minimizes steps and gaps on the inner surface of the pipe. It is an object of the present invention to provide a pipe joining structure and a joining method capable of simply joining two pipes.

In order to solve the above-mentioned problem, the present invention comprises a belt-like water-stopping material formed by laminating a slipping sheet on one side of a water-stopping layer and wound around the pipe, and the distance between both ends is equal to or larger than the outer diameter of the pipe. There is provided a water-stopping jig characterized by comprising a tightening band that can be expanded to a shape and has a deformability and a resilience so that the shape can be restored thereafter, and is formed into a cylindrical shape by fastening both ends.
In this water stop jig, the water stop material has a length along the circumferential direction of the pipe shorter than an outer circumference length of the pipe, and the water stop jig is formed of the water stop material. It is preferable to provide a rod-shaped filler filled between both end edges in the circumferential direction of the tube.

  Further, in the present invention, a band-shaped water-stopping material formed by laminating a slipping sheet on one surface of a water-stopping layer is wound around the butted portion of a pair of pipes to be joined, and the periphery of the water-stopping material Is attached with a fastening band having a deformability and a restoring property so that the distance between both ends can be expanded beyond the outer diameter of the tube and the shape can be restored thereafter. Provided is a tube joining structure characterized by being cylindrical.

  Further, the present invention wraps a band-shaped water-stopping material formed by laminating a sliding sheet on one side of a water-stopping layer around the butted portion of a pair of pipes to be joined, A clamping band having a deformability and a restoring property that can expand the interval of the portion beyond the outer diameter of the pipe and then restore the shape is attached, and both ends of the clamping band are fastened into a cylindrical shape. A method for joining pipes is provided.

  According to the water-stopping jig of the present invention, the water-stopping material is pressure-bonded by the tightening band, and the water-stopping material is peeled off or loosened following the behavior of expansion and contraction or flattening that occurs in the pipe due to disturbance such as earth pressure. Therefore, excellent water tightness and air tightness can be obtained. That is, the water stop material can be adhered to the outer surface of the pipe by the water stop layer having elasticity and adhesiveness. Since slip sheets are laminated on the outer surface of the waterproofing material, slipping occurs between the inner surface of the fastening band and the outer surface of the waterproofing material when fastening both ends of the fastening band to attach the fastening band. It is possible, and the tightening band can be mounted uniformly without disturbing the state in which the water stop layer is in close contact with the periphery of the pipe. Due to the deformability and resilience of the tightening band, it is possible to attach the tightening band in accordance with various situations, and the workability is excellent.

  According to the pipe joining structure of the present invention, two pipes are brought into contact with each other, so that the occurrence of a step on the inner surface of the pipe line is suppressed, and a joined portion with no deterioration in the flow-down performance can be obtained. Due to the deformability and recoverability of the fastening band, it can be applied to various situations such as when the length of the straight pipe portion from the pipe end is short. Since the water-stopping material and the fastening band are excellent in followability to the behavior of the pipe, even if the joint part behaves like expansion and contraction or flattening, the joint surface is hardly peeled off and the joint structure has excellent long-term reliability. .

The present invention will be described below with reference to the drawings based on the best mode.
1 to 3 are drawings showing one embodiment of a pipe joining structure according to the present invention. FIG. 1 is a perspective view, FIG. 2 is a transverse sectional view, and FIG. 3 is an exploded perspective view.
As shown in FIG. 3, the pipe joint structure 1 according to the present embodiment includes a water stop jig according to the present invention around a butt portion formed by butting a first pipe 2 and a second pipe 3. 10 is provided. The first tube 2 and the second tube 3 are round tubes having the same outer diameter. Here, the water-stopping jig 10 includes a band-shaped water-stopping material 11 wound around the pipes 2 and 3, and a fastening band 20 that is formed into a cylindrical shape by fastening both end portions 22. In the example shown in FIGS. 1 to 3, the water stopping jig 10 is used as a pipe joint for joining two pipes 2 and 3.

As shown in FIG. 5, the water stop material 11 is a belt-like sheet formed by laminating a slip sheet 13 on one surface of the water stop layer 12.
The material constituting the water blocking layer 12 is preferably a rubber or resin rich in adhesiveness and elasticity. For example, butyl rubber, natural rubber (NR), isoprene rubber (IR), chloroprene rubber (CR), styrene-butadiene rubber ( A vulcanized rubber having elasticity such as SBR) is suitable. Moreover, you may comprise the water stop layer 12 with water expansible rubber | gum. The water-stopping layer 12 is tightly attached to the outer peripheral surface of the pipe by tightening the fastening band 20 from above the water-stopping material 11 and exhibits water-stopping properties. Since the water blocking layer 12 has elasticity (flexibility) as well as adhesiveness, it follows the behavior of the tube and does not peel off.
In the slippery sheet 13, the outer surface 13 a opposite to the water-stopping layer 12 is a slippery surface, and the friction against the inner surface of the fastening band 20 is small. Examples of the slidable sheet 13 covered with the water blocking layer 12 include resin films such as cellophane, polyethylene film, and polypropylene film.
As the water-stopping material 11, an appropriate release paper 16 is laminated for protecting the water-stopping layer 12, and a type in which the release paper 16 is peeled off before use can be used.

The width of the water blocking material 11 (dimension along the longitudinal direction of the pipe) may be a little longer as long as a sufficient width is secured on both sides of the butted portions of the pipes 2 and 3 in order to prevent water leakage. For example, it is about 20 cm.
The length of the water blocking material 11 (dimension in the direction along the circumference of the pipe) is preferably such that both ends do not overlap when wound around the pipe. As a suitable example, the outer circumference of the pipe The length is about the same as the length or about 3 mm shorter than the outer peripheral length of the tube. When the water blocking material 11 is wound around the pipes 2 and 3, as shown in FIG. 4B, a gap d between both end edges 14 and 14 is secured about 3 to 6 mm. Thereby, both ends of the water-stopping material 11 are not overlapped, and it is possible to prevent a step from occurring in the thickness direction of the water-stopping material 11. If both end portions of the water blocking material 11 overlap, the end portion on the upper side is lifted from the outer peripheral surface of the pipe, which may cause a water leakage path, which is not desirable.
When the length of the water stop material 11 prepared in advance is longer than a required dimension, the length can be adjusted by cutting with a cutter or the like.

A gap between both end edges 14 of the water-stopping material 11 is filled with a rod-like filler 15 having water-stopping properties. The rod-like filler is preferably composed of rubber and resin rich in adhesiveness and elasticity. Specific examples include butyl rubber, natural rubber (NR), isoprene rubber (IR), chloroprene rubber (CR), and styrene-butadiene rubber. (SBR), water-expandable rubber and the like. As such a rod-shaped filler 15, for example, 2TD-TM (trade name) manufactured by Hayakawa Rubber Co., Ltd. is suitable.
In addition, when the both-ends edges 14 and 14 of the water stop material 11 can be faced | matched without gap, the rod-shaped filler 15 can also be abbreviate | omitted.

As shown in FIGS. 2 and 3, the fastening band 20 includes a C-shaped tubular portion 21 having an arc-shaped cross section, and a pair of protruding portions 22 formed by bending from both end edges of the tubular portion 21. And have.
Examples of the fastening band 20 include fiber reinforced plastic (FRP) obtained by impregnating a fiber such as glass fiber with a plastic such as an unsaturated polyester resin, and stainless steel. Even if these materials are buried in the soil, they are excellent in water resistance and corrosion resistance, so they do not change and are harmless.

Since the inner surface of the cylindrical portion 21 is in contact with the outer surface of the slippery sheet 13, it is desirable that the inner surface of the tubular part 21 be a surface having a low resistance (smooth surface) to the slippery sheet 13.
The length of the tubular portion 21 (the dimension along the circumferential direction of the tube) can be determined according to the outer diameter of the tubes 2 and 3. It is desirable that the length of the tubular portion 21 is such that an appropriate tightening force is applied to the water stop material 11 when the tightening band 20 is fastened.
The width of the cylindrical portion 21 (the dimension along the longitudinal direction of the pipe) is preferably equal to or greater than the width of the water blocking material 11 so as to cover the entire water blocking material 11. However, if it is unnecessarily large, it is not preferable in that the space necessary for mounting the fastening band 20 becomes too large or the manufacturing cost increases. It is desirable that the width is the same as the width of the water blocking material 11.

As shown in FIG. 6, the tubular portion 21 has a deformability and a resilience such that the distance between the both end portions 22 can be expanded beyond the outer diameter of the tube and the shape can be restored thereafter. This makes it possible to attach the fastening band 20 from the outside of the butted portion after the two tubes 2 and 3 are butted. Therefore, the fastening band 20 can be attached even in various situations such as when the length of the straight pipe portion from the pipe end is short. Further, since the tubular portion 21 can be deformed following the flatness or expansion / contraction of the pipe, even if a deformation behavior occurs in the pipe, the water-stopping material 11 is kept crimped to prevent the water-stopping material 11 from peeling off. can do.
When any of the pipes has a straight pipe portion having a sufficient length from the pipe end, the fastening band 20 is passed through one pipe in advance and the two pipes are brought into contact with each other. It is also possible to take a procedure of shifting and arranging the components on the abutting portion.

The protruding portion 22 is formed integrally with the cylindrical portion 21 and protrudes outward in the radial direction of the cylindrical portion 21. As shown in FIG. 3, the pair of protrusions 22 are formed with attachment holes 23 for attaching fastening members at positions aligned with each other. In the illustrated example, three pairs of mounting holes 23 are formed at equal intervals in the width direction of the fastening band 20.
Here, bolts 24 and nuts 25 are used as the fastening members. The fastening band 20 is configured such that the bolts 24 are inserted into the mounting holes 23, the nuts 25 are attached to the tips of the bolts 24, and the bolts 24 and the nuts 25 are screwed together, whereby both ends (projections) 22 are fastened. The cylindrical part 21 becomes cylindrical.

Next, a method of butting two tubes together using the water stopping jig 10 of this embodiment will be described.
First, as shown in FIG. 4A, the ends 2a and 3a of the pair of tubes 2 and 3 to be joined are faced to each other and abutted against each other. Although it is desirable to make the gap between the pipe ends 2a and 3a as small as possible, there is no problem even if there is a slight gap since the water blocking material 11 is covered from above the gap.
Next, as shown in FIG. 4B, the water stop material 11 is wound around the butted portion 4 of the two pipes 2 and 3. The water stop material 11 is attached so that the water stop layer 12 is on the inner side and the slip sheet 13 is on the outer side. In this example, the water blocking material 11 is wound around the both sides of the butting portion 4 (left and right sides in FIG. 4) with a substantially uniform width.
Next, as shown in FIG. 4 (c), the gap between the both end edges 14, 14 of the water blocking material 11 is filled with a rod-shaped filler 15 to close the gap. The rod-shaped filler 15 is preferably pressed and pressed with fingers or the like.
Next, as shown in FIG. 6, the interval between the end portions 22, 22 of the fastening band 20 is expanded beyond the outer diameter of the tubes 2, 3, and the fastening band 20 is wound around the tubes 2, 3 around which the waterstop material 11 is wound. Install around. Since the outer surface of the water-stopping material 11 is a surface having a small friction due to the sliding sheet 13, the water-stopping layer 12 does not stick to the fastening band 20 when the fastening band 20 is attached.
Next, as shown in FIG. 4D, both end portions 22 of the fastening band 20 are fastened with bolts 24 and nuts 25, and the tubular portion 21 is fixed in a tubular shape. Due to the elasticity and tightening force of the tightening band 20, the water-stopping layer 12 existing on the inner surface side of the water-stopping material 11 is pressure-bonded to the outer surfaces of the pipes 2 and 3, and reliable watertightness and airtightness are obtained.

When two pipes are fixed and the interval between these pipes is large, a third pipe for adjusting the length can be inserted between the pipe ends. Examples of the method for inserting the third tube include a method of inserting little by little while hitting the periphery evenly with a mallet or the like.
In this case, the butt portion of the two pipes is generated at one place between the first pipe and the third pipe and at one place between the second pipe and the third pipe, for a total of two places. become. When the length of the third pipe is long to some extent, it is possible to attach and join the above-mentioned water stop jigs to the respective butted portions.

  If the length of the third tube is sufficiently shorter than the width of the water-stopping material, the water-stopping material is placed so as to straddle the third tube from the end of the first tube to the end of the second tube. Three pipes can be joined by attaching the tightening band on the water-stopping material after wrapping them at the same position and filling the gap between the water-stopping materials with a rod-like filler as necessary. Since the water stop material is pressure-bonded on any of the joint portions, the water tightness and the air tightness of both joint portions can be ensured with a single water stop material. Thereby, joining of the both sides of the 3rd pipe can be constructed with one set of water stop jigs.

According to the water-stopping jig of this embodiment, the water-stopping material is pressure-bonded by a fastening band, and the water-stopping material is peeled or loosened following the behavior of expansion and contraction or flattening that occurs in the pipe due to disturbance such as earth pressure. Therefore, excellent water tightness and air tightness can be obtained. That is, the inner surface of the water-stopping material can be in close contact with the outer surface of the pipe by the water-stopping layer having elasticity and adhesiveness. In addition, since the slip sheet is laminated on the outer surface of the water stop material, when attaching both ends of the tightening band to attach the tightening band, between the inner surface of the tightening band and the outer surface of the water stop material Sliding is possible, and the tightening band can be mounted uniformly without disturbing the state in which the water blocking layer is in close contact with the periphery of the tube.
Due to the deformability and resilience of the tightening band, it is possible to attach the tightening band even after the pipes are abutted, so if the pipe is connected to a structure such as a manhole near the end of the pipe, Construction is possible even in various situations, such as when there is a bent part nearby.

As mentioned above, although the case where the water stop jig | tool was used as a pipe joint which joins a some pipe | tube was demonstrated, the water stop jig | tool of this embodiment can also be utilized when repairing one pipe | tube. . That is, as illustrated in FIG. 6, by expanding the interval between the two end portions 22 of the fastening band 20, it is possible to attach around one tube without interruption. When a water leakage part such as a crack or a hole is formed in the middle, the water leakage part can be stopped and used to repair the pipe.
In this case, the method of repairing the pipe is the same as the method of joining the pipes, and the portion that is covered and stopped by the water stop portion is not the butted portion of the two pipes as shown in FIG. It is different that it is a water leakage part such as a crack or a hole generated in one pipe. That is, first of all, a water-stopping material is wound around the water leakage portion, and a gap between the both ends of the water-stopping material is filled with a rod-shaped filler to close the gap, and then the fastening band is wrapped around the water-stopping material. Install it according to the procedure of mounting around and fastening.
Thereby, since the water stop material is pressure-bonded by the tightening band and the behavior of the pipe is followed to prevent peeling or loosening of the water stop material, excellent water tightness and air tightness can be obtained. That is, the inner surface of the water-stopping material can be in close contact with the outer surface of the pipe by the water-stopping layer having elasticity and adhesiveness. In addition, since the slip sheet is laminated on the outer surface of the water stop material, when attaching both ends of the tightening band to attach the tightening band, between the inner surface of the tightening band and the outer surface of the water stop material Sliding is possible, and the tightening band can be mounted uniformly without disturbing the state in which the water blocking layer is in close contact with the periphery of the tube.

  The present invention can be used for joining and repairing pipes in pipe lines (for example, waterworks and sewers) used for water supply and drainage, for example. Since construction is possible in response to various situations, it is particularly suitable when the pipe is fixed and cannot be moved.

It is a perspective view which shows an example of the pipe joint structure of this invention. It is a cross-sectional view of the pipe joint structure shown in FIG. It is a disassembled perspective view of the pipe joint structure shown in FIG. It is drawing which shows an example of the joining method of the pipe | tube of this invention, (a) is a front view which shows the state which faced | matched two pipes, (b) wound the water stop material around the outer periphery of the butt | matching part of a pipe | tube. The front view which shows a state, (c) is a front view which shows the state by which the rod-shaped filler was pressure-fitted between the both ends of a water-stopping material, (d) is the state which attached the fastening band on the water-stopping material. FIG. It is sectional drawing which shows an example of a water stop material. It is a cross-sectional view explaining a mode that a fastening band is attached to a pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pipe joining structure, 2 ... 1st pipe, 3 ... 2nd pipe, 4 ... Butt part, 10 ... Jig for water stop, 11 ... Water stop material, 12 ... Water stop layer, 13 ... Sliding property Sheet, 14 ... Edge of water stop material, 15 ... Bar-shaped filler, 20 ... Fastening band, 22 ... End of fastening band, 24 ... Bolt (fastening member), 25 ... Nut (fastening member).

Claims (4)

  A slip sheet is laminated on one side of the water-stopping layer, and the band-like water-stopping material wound around the pipe and the distance between both ends can be expanded beyond the outer diameter of the pipe and the shape can be restored thereafter. A water-stopping jig characterized by comprising a tightening band that has excellent deformability and restoration property and is formed into a cylindrical shape by fastening both ends.   The length of the waterstop material along the circumferential direction of the tube is shorter than the length of the outer periphery of the tube, and the waterstop jig is configured to have both edges of the waterstop material in the circumferential direction of the tube. The water-stopping jig according to claim 1, further comprising a rod-shaped filler filled between the two.   A band-shaped water-stopping material formed by laminating a sliding sheet on one side of the water-stopping layer is wound around the butted portion of the pair of pipes to be joined. A tightening band having a deformability and a resilience so that the interval can be expanded beyond the outer diameter of the tube and the shape can be restored thereafter, and the tightening band is formed into a cylindrical shape by fastening both ends. A tube joining structure characterized by that.   A band-shaped water-stopping material formed by laminating a sliding sheet on one side of the water-stopping layer is wound around the butted portions of the pair of pipes to be joined, and the pipes are spaced around the water-stopping material at intervals between both ends. A fastening band having a deformability and resilience that can be expanded beyond the outer diameter of the joint and having a shape that can be restored thereafter is attached, and both ends of the fastening band are fastened into a tubular shape. Joining method.

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