JP2005282763A - Water stop packing material and water stop structure for pipeline using this material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water stop structure which makes it possible to correct a deviation between cores of a main pipe and a sheath pipe so that an easy and short-time construction can be carried out and which ensures that a water stopping can be performed without occurrence of dropping off. <P>SOLUTION: An annular water stop packing 5, which is attached into a gap 6 between the inner circumferential surface 2a of the sheath pipe and the outer circumferential surface 1a of the main pipe, is comprised of an outer layer 7 and inner layer 8. The outer layer 7 and the inner layer 8 include water-expansive sections 10, 11 respectively which are each provided ahead of and behind them with non-water-expansive sections 12, 13 integrally cast with the water-expansive sections, and are eccentrically formed with each other by decentering central axis lines CL1, CL3 for the outer circumferential surface 7a, 8a respectively and central axis lines CL2, CL4 for inner circumferential surface 7b, 8b so as to have the layer section 7L and 8L having the maximum thickness and the layer section 7S and 8S having the minimum thickness. Furthermore, halved cuts 18 are formed such as to radially extend from an insertion hole 16 through which the main pipe 1 is inserted and to reach the outer side face 5a. The halved cuts 18 are constructed such as to have a stepped cut shape which allows the outer layer 7 and the inner layer 8 to be fitted with each other in the circumference by bending halfway the halved cut in the direction of the central axis line CL. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a water stop for stopping a gap between a gas pipe, a water and sewage pipe, a conduit pipe or the like (hereinafter referred to as a main pipe) and a sheath pipe penetrating and embedded in a concrete wall or the like and constituting a pipe line. The present invention relates to a packing material and a water stop structure of a pipe line using the packing material.

  Conventionally, as a water-stopping method between a sheath pipe and a main pipe of a penetration portion of a pipe line embedded in a concrete wall or the like, a foam-curing liquid material such as urethane foam as shown in Patent Document 1 below And a method of compressing and deforming the elastic body by sandwiching an elastic body as shown in Patent Document 2 below and tightening the flange with a bolt.

Further, there has been proposed a water stop cock in which an annular non-water expansion portion is integrally formed before and after an annular water expansion portion as shown in Patent Document 3 below, and is eccentric to one of the central axes in advance.
Japanese Patent Publication No.37-928 Japanese Utility Model Publication No. 55-24019 Japanese Examined Patent Publication No. 7-53014

  However, in the method of the above-mentioned Patent Document 1, the material strength is weak, and in fact, it loses water pressure and flows into the pipeline, and there is no water stop effect. In addition, the workability for injecting the liquid substance is poor, and in addition, the injection adhesion due to the foam-curing liquid substance between the main pipe and the sheath pipe is often incomplete due to dirt on the bonding surface, and as a result, it stops. There is a disadvantage that the water effect cannot be obtained.

  On the other hand, since the method of the above-mentioned patent document 2 is a structure using a flange and a bolt, it cannot be used when there is not enough space between the inner diameter of the sheath pipe and the outer diameter of the main pipe. In addition, since the center axis of the sheath tube and the main tube are often not aligned with each other, and are often misaligned by so-called decentration, an elastic body must be prepared for each decentering amount. There is a disadvantage that it takes.

  Moreover, in the water stop cock of the above-mentioned patent document 3, this is the thing of the structure eccentrically made below the pipe line for the water stop of the pipe line for laying a cable, but it was provided in the concrete wall. When the main pipe is actually constructed on the sheath pipe, the eccentricity changes depending on the site, so it cannot be handled by one stop cock, and has the same drawbacks as the above-mentioned Patent Document 2.

  Therefore, the present invention can correct the misalignment by continuously changing the amount of eccentricity even if there is misalignment between the main pipe and the sheath pipe, without depending on the repulsive force against the push-in or the stress generated by tightening bolts etc. It is an object of the present invention to provide a water stop structure for a pipe line that can be easily and quickly constructed, and that allows the water stop packing material to be less likely to drop off and reliably stop water.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The waterproof packing material according to claim 1 of the present invention is attached to a gap portion 6 between the inner peripheral surface 2a of one pipe 2 and the outer peripheral surface 1a of the other pipe 1 inserted and disposed in the one pipe 2. An annular water-proof packing material 5,
A water-expandable rubber material or heat which is composed of an outer layer portion 7 in contact with the one tube 2 and an inner layer portion 8 in contact with the outer peripheral surface 1a of the other tube 1 and each of the portions 7 and 8 is formed by kneading and integrating a water absorbent resin. Ring-shaped non-water-expandable portions 12, 13 made of a non-water-expandable rubber material or a thermoplastic elastomer material are integrally formed on at least one of the front and rear sides of the ring-shaped water-expandable portions 10, 11 made of a plastic elastomer material,
The outer layer portion 7 and the inner layer portion 8 are formed by decentering the center axis lines CL1 and CL3 on the outer peripheral surfaces 7a and 8a and the center axis lines CL2 and CL4 on the inner peripheral surfaces 7b and 8b, respectively. 7L, 8L and the minimum thickness portion 7S, 8S,
A half cut 18 is formed extending in the radial direction from the insertion hole 16 through which the other pipe 1 is inserted and reaching the outer surface 5a. The shape of the half cut 18 is a direction along the direction of the central axis CL. It is characterized by having a stepped cut shape that bends the middle and fits in the circumferential direction.

According to this water-stopping packing material 5, the half-cut 18 is opened and fitted to the outer peripheral surface 1 a of the other tube 1, and the water-stopping packing material 5 is directly attached along the outer peripheral surface 1 a of the other tube 1. The gap 6 between the other pipe outer peripheral surface 1a and the one pipe inner peripheral surface 2a is closed by sliding it into the inner peripheral side of one pipe 2. In the initial stage of the mounting, even if the gap portion 6 is in a loose state, the water expansion portions 10 and 11 of the water-stopping packing material 5 are caused by moisture that has entered between the inner circumference 2a of the pipe and the outer circumference 1a of the other pipe. Expands in the inner and outer peripheral directions, and is brought into close contact with the inner periphery 2a of one tube and the outer periphery 1a of the other tube to perform a strong water stop action.
The expansion of the water expansion portions 10 and 11 of the water-stopping packing material 5 is prevented from expanding back and forth by the front and rear non-water expansion portions 12 and 13, so that expansion in the inner and outer peripheral directions increases. Moreover, there is no inconvenience such as inflating and projecting torn back and forth. Moreover, since the water expansion parts 10 and 11 of a comparatively brittle material are protected by the front and back non-water expansion parts 12 and 13, the handling is easy. Moreover, since the outer-layer part 7 and the inner-layer part 8 are each eccentric, the water-stopping packing material 5 is continuously changed from the concentric state to the eccentric state by changing the fitting state. It becomes possible to cope.
Moreover, since the shape of the half cut 18 is a stepped cut shape and an uneven shape that fits each other, the inner layer portion 8 from the other tube 1 side to the outer layer portion 7 on the one tube 2 side. When the tube is pushed and inserted, the notched portion is not displaced along the direction of the central axis CL, and the circumferentially continuous state is maintained, and the gap between the tube 1 and the tube 1 between the one tube 2 and the other is maintained. In the portion 6, there is no possibility that a gap is generated in the cut portion or the water-stopping packing material 5 is dropped off, and the water-stopping effect is not lowered.
In addition, by forming the flange portion 14 on the outer peripheral edge portion on the rear end side of the outer layer portion 7, the outer layer portion 7 does not move to the back of the one tube 2 when the inner layer portion 8 is inserted. .

  The water sealing packing material according to claim 2 is the water sealing packing material according to claim 1, wherein the outer peripheral surface of the outer layer portion 7 is an interface between the outer layer portion 7 and the inner layer portion 8, and the outer periphery of the inner layer portion 8. Each of the surfaces 8a is a tapered surface.

  According to the water blocking packing material 5, the outer layer portion 7 and the inner layer portion 8 are configured such that the interface portion is a tapered surface, that is, the front (back) side of the inner layer 8 is thin and the rear end (front) side is thin. When the inner layer portion 8 is inserted into the outer layer portion 7 after the outer layer portion 7 is attached to the one pipe 2, the inner layer portion 8 is inserted at the initial stage of insertion of the outer layer portion 7. Since a gap is formed between the inner peripheral surface 7b and the outer peripheral surface 8a of the inner layer portion 8, the insertion work becomes easy, and the gap between the two layer portions 7 and 8 is eliminated at the final stage of insertion. It will be in an attachment state and the sufficient water stop effect can be acquired.

The water stop structure of the pipe according to claim 3 of the present invention includes a sheath pipe 2 that is embedded in a concrete wall 3 or the like to form a pipe pipe, and a main pipe 1 that is inserted through the sheath pipe 2. In the water stop structure of the pipeline that stops water in the gap,
An annular water sealing packing material 5 attached to a gap portion 6 between the inner peripheral surface 2a of the sheath pipe 2 and the outer peripheral surface 1a of the main pipe 1,
The annular water blocking packing material 5 is composed of an outer layer portion 7 in contact with the sheath tube 2 and an inner layer portion 8 in contact with the outer peripheral surface 1a of the main tube 1, and the layer portions 7 and 8 knead and integrate the water-absorbing resin. In addition, annular non-water-expandable portions 12 and 13 made of a non-water-expandable rubber material or thermoplastic elastomer material are provided at least before and after the annular water-expandable portions 10 and 11 made of a water-expandable rubber material or a thermoplastic elastomer material. It is integrally molded,
The outer layer portion 7 and the inner layer portion 8 are formed by decentering the center axis lines CL1 and CL3 on the outer peripheral surfaces 7a and 8a and the center axis lines CL2 and CL4 on the inner peripheral surfaces 7b and 8b, respectively. 7L, 8L and the minimum thickness portion 7S, 8S,
A half cut 18 is formed extending in the radial direction from the insertion hole 16 through which the main pipe 1 is inserted and reaching the outer surface 5a. The half cut 18 is shaped in a direction along the direction of the central axis CL. It is characterized by having a stepped cut shape that bends in the middle and fits in the circumferential direction.

According to this water-stop structure of the pipe, the annular water-stopping packing material 5 is attached to the outer peripheral surface 1a of the main pipe 1 by opening the half cut 18 and fitting the annular water-proof packing material 5 as it is. 1 is slid along the outer peripheral surface 1a and pushed into the inner peripheral side of the sheath tube 2 to close the gap 6 between the outer peripheral surface 1a of the main tube and the inner peripheral surface 2a of the sheath tube. Even in the loose state at the beginning of the mounting, the water expansion portions 10 and 11 of the annular water blocking packing material 5 expand in the inner and outer peripheral directions due to moisture that has entered between the inner periphery 2a of the sheath tube and the outer periphery 1a of the main tube later. Then, it is in close contact with the inner periphery 2a of the sheath tube and the outer periphery 1a of the main tube, and performs a strong water stop action.
The expansion of the water expansion portions 10 and 11 of the annular water blocking packing material 5 is largely expanded in the inner and outer peripheral directions because the front and rear non-water expansion portions 12 and 13 prevent the expansion. In addition, there is no inconvenience such as inflating and protruding forward and tearing. Moreover, since the water expansion parts 10 and 11 of a comparatively brittle material are protected by the front and back non-water expansion parts 12 and 13, the handling is easy. Moreover, since the outer-layer part 7 and the inner-layer part 8 are each eccentric, the cyclic | annular still water packing material 5 is changed from a concentric state to the eccentric state pipe line by rotating and changing a fitting state. It becomes possible to respond continuously.
Moreover, since the shape of the half cut 18 is a stepped cut shape and is an uneven shape that fits each other, the inner layer portion 8 is pushed from the main tube 1 side into the outer layer portion 7 on the sheath tube 2 side. At the time of insertion, the notched portion is not displaced along the direction of the central axis CL, and the attached state is maintained in a continuous state in the circumferential direction, and the gap portion 6 between the sheath tube 2 and the main tube 1 is maintained. In addition, there is no possibility that a gap is generated at the cut portion or the water-stopping packing material 5 falls off, and the water-stopping effect is not deteriorated.
In addition, by forming the flange portion 14 at the outer peripheral edge portion on the rear end side of the outer layer portion 7, the outer layer portion 7 is not moved to the back of the sheath tube 2 when the inner layer portion 8 is inserted.

  The water stop structure for a pipe according to claim 4 is the water stop structure according to claim 3, wherein the annular water stop packing material 5 includes a maximum thickness portion 7 </ b> L of the outer layer portion 7 and a minimum thickness portion of the inner layer portion 8. When 8S overlaps, the center of the insertion hole CL4 is concentric with the center CL1 with respect to the outer surface 5a, and when the maximum thickness portions 7L, 8L of the outer layer portion 7 and the inner layer portion 8 overlap each other, CL4 is most eccentric with respect to the center CL1 with respect to the outer surface 5a, and the amount of eccentricity is continuously variable.

  According to this water stop structure of the pipe line, the center CL1 and the inner layer inner peripheral surface 8b with respect to the outer side surface 5a which is the outer layer outer peripheral surface 7a in the mounted state of the outer layer portion 7 and the inner layer portion 8 of the annular water blocking packing material 5. It is possible to continuously change the amount of eccentricity of the insertion hole 16 with respect to the center CL4 from the concentric state to the most eccentric state. Different pipe lines can be constructed.

  The structure of the pipe line according to claim 5 is the water stop structure of the pipe line according to claim 3 or 4, wherein the inner peripheral surface 7b and the inner layer of the outer layer part 7 are interfaces between the outer layer part 7 and the inner layer part 8. The outer peripheral surface 8a of the part 8 is configured by a tapered surface.

  According to this water-stop structure of the pipe line, the outer layer portion 7 and the inner layer portion 8 are configured such that the interface portion is a tapered surface, that is, the tip (back) side of the inner layer 8 is thin and the rear end (front). By forming the outer layer portion 7 as a tapered surface, the outer layer portion 7 is attached to the sheath tube 2 and then the inner layer portion 8 is inserted into the outer layer portion 7 at the initial insertion time of the inner layer portion 8. Since a gap is formed between the inner peripheral surface 7b and the outer peripheral surface 8a of the inner layer portion 8, the insertion work becomes easy, and the gap between the two layer portions 7 and 8 is eliminated at the final stage of insertion. It will be in an attachment state and the sufficient water stop effect can be acquired.

According to the present invention, as an annular water-proof packing material, a rubber material or a thermoplastic elastomer material that absorbs and expands water is used, so there is material strength, and it does not flow out against water pressure like foamed urethane, Further, since the expansion force due to the water absorption expansion is used for the water stopping action regardless of the stress generated by tightening the bolt or the like, the pushing force may be small with a simple product shape.
And since the water expansion part is integrally formed with the water expansion part sandwiched between the non-water expansion parts, the expansion direction is restricted, i.e., the front and rear non-water expansion parts are prevented from expanding back and forth. Therefore, the expansion in the inner and outer peripheral directions is increased, and it is possible to effectively act in the water stopping direction. In addition, there is no inconvenience such as inflating and projecting back and forth.
Moreover, since the outer layer part and inner layer part which comprise a cyclic | annular water-stopping packing material are each eccentric, the core shift | offset | difference has arisen between one pipe | tube (sheath pipe) and the other pipe | tube (main pipe | tube). However, since the amount of eccentricity can be continuously dealt with by rotating the fitting state, it is only necessary to prepare one set of the outer layer portion and the inner layer portion, and the water-proof packing material for each eccentric amount as in the past. Is not prepared.
In addition, since the annular water-proof packing material is attached to one pipe (main pipe), the cut reaching from the outer circumference to the inner circumference is one half cut, and it is not divided more than necessary and may be lost. Nor. In addition, since the half-cut shape is a stepped cut shape and is an uneven shape that fits each other, the cut portion does not shift along the direction of the central axis, and the When the main pipe is pushed in and inserted, the fitted state is maintained in the circumferential direction while maintaining the fitted state of each other, and there is no possibility that the waterproof packing material will fall off from these gap portions. Moreover, there is no such thing as reducing the water stop effect.
Further, according to the water-stopping packing material and the water-stopping structure of the pipe line using the same, the outer layer portion and the inner layer portion are constituted by a tapered surface at the interface portion, that is, the tip (back) side of the inner layer portion. Is formed as a tapered surface that thickens the rear end (near side), so that when the outer layer portion is inserted into one tube (sheath tube) and the inner layer portion is inserted into the outer layer portion, In the initial stage of insertion, there is a gap between the inner peripheral surface of the outer layer portion and the outer peripheral surface of the inner layer portion, so that the insertion work becomes easy, and there is no gap between both layer portions at the final stage of insertion. It becomes an attachment state and can obtain a sufficient water stop effect.

Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a cross-sectional view of a water stop packing material according to an embodiment of the present invention and a water stop structure of a pipe line using the same, and FIG. 2 is a front view of an annular water stop packing material used in the water stop structure. 3 is a side view of the water blocking packing material.

  Usually, a sheath tube 2 as one tube through which the main tube 1 as the other tube is inserted is embedded through a wall 4 of a concrete wall 3 such as an underground structure. An annular water-proof packing material 5 is fitted and attached to a gap portion between the inner peripheral surface 2 a of the sheath tube 2 and the outer peripheral surface 1 a of the main tube 1.

  The annular water blocking packing material 5 includes an outer layer portion 7 and an inner layer portion 8. In the middle portion in the central axis direction of each of the layer portions 7 and 8 of the annular water blocking packing material 5, annular water expansion portions 10 and 11 are integrally formed. The water expansion portions 10 and 11 are made of a water expandable rubber material or a thermoplastic elastomer material in which a water absorbent resin (water expandable resin) is kneaded. Moreover, each layer part 7 and 8 of the cyclic | annular waterproofing packing material 5 is a normal non-water-expandable rubber material in the part except the water expansion parts 10 and 11, ie, the front and back (left and right in FIG. 1) in the central axis direction. Or it is set as the non-expandable parts 12 and 13 comprised with a thermoplastic elastomer material. In this case, it is desirable to co-vulcanize the water expansion parts 10 and 11 and the front and rear non-water expansion parts 12 and 13.

  Moreover, as shown in FIG. 3, the outer peripheral surface 7a of the outer layer portion 7 which is the outer side surface 5a of the annular water blocking packing material 5 is located at a substantially intermediate portion in the direction of the central axis, and the protrusion 9 is in the circumferential direction. It is formed continuously. In the present embodiment, the ridge 9 is formed to have a substantially triangular cross section, that is, a substantially sawtooth cross section that forms an inclined surface from the front end to the rear end of the outer peripheral surface 7a. Further, a flange portion 14 is formed at the rear end of the annular water blocking packing material 5, that is, the outer peripheral edge portion of the rear end of the outer layer portion 7. The outer diameter of the flange portion 14 is preferably formed sufficiently larger than the inner diameter of the sheath tube 2.

  As shown in FIG. 2, the insertion hole 15 formed through the inner peripheral surface 7b of the outer layer portion 7 has a center axis CL2 that is eccentric with respect to the center axis CL1 of the outer surface 7a of the outer layer portion 7. The circumferential side wall portion of the outer layer portion 7 has a shape having a maximum thickness portion 7L and a minimum thickness portion 7S. Further, the inner peripheral surface 7b of the outer layer portion 7 is configured by a tapered surface so that the inner diameter becomes smaller from the rear end toward the front end.

The through-hole 16 formed in the inner peripheral surface 8b of the inner layer portion 8 has a central axis CL4 that is offset from the central axis CL3 on the outer peripheral surface 8a of the inner layer portion 8 in the same manner as the outer layer portion 7 described above. The side wall portion in the circumferential direction of the inner layer portion 8 has a shape having a maximum thickness portion 8L and a minimum thickness portion 8S. In addition, the outer peripheral surface 8a of the inner layer portion 8 is configured by a tapered surface so that the outer diameter decreases from the rear end toward the front end. The outer peripheral surface 8 a of the inner layer portion 8 and the inner peripheral surface 7 b of the outer layer portion 7 serve as an interface between the outer layer portion 7 and the inner layer portion 8 as the annular water blocking packing material 5. The thicknesses of the maximum thickness portions 7L and 8L and the minimum thickness portions 7S and 8S of the outer layer portion 7 and the inner layer portion 8 are the same as those of the maximum thickness portion 7L and the inner layer portion 8 of the outer layer portion 7. The total thickness T1 of the minimum thickness portion 8S and the total thickness T2 of the minimum thickness portion 7S of the outer layer portion 7 and the maximum thickness portion 8L of the inner layer portion 8 are set so as to be equal to each other. Has been. That is, as shown in FIG. 5, the maximum thickness portion 7L of the outer layer portion 7 and the minimum thickness portion 8S of the inner layer portion 8 are combined, and the minimum thickness portion 7S of the outer layer portion 7 and the maximum thickness portion of the inner layer portion 8 are combined. In a state in which 8L is combined, the central axis CL1 with respect to the outer peripheral surface 7a of the outer layer portion 7 and the central axis CL4 with respect to the inner peripheral surface 8b of the inner layer portion 8 coincide with each other.

  A half cut 18 is provided in each of the maximum thickness portions 7L and 8L of the outer layer portion 7 and the inner layer portion 8. The half cut 18 is continuous over the outer layer portion 7 and the inner layer portion 8, that is, extends radially from the inner peripheral surface 8b of the insertion hole 16 of the inner layer portion 8 through which the main pipe 1 is inserted. The outer peripheral surface 8a of the part 8, the inner peripheral surface 7b of the outer layer part 7, and the outer surface 5a of the annular water blocking packing material 5 which is the outer peripheral surface 7a of the outer layer part 7 are formed. The shape of the half cut 18 is a stepped cut shape in which the middle is bent in the direction along the direction of the central axis CL (CL1 to CL4) and fitted to each other in the circumferential direction. As shown in the figure, it is composed of a substantially V-shaped convex shape and a concave shape, and is fitted to each other in the direction along the circumferential direction. The half cut 18 is formed by using a press machine after the outer layer portion 7 and the inner layer portion 8 are formed.

  Therefore, in the above-described annular waterproof packing material 5, as shown in FIG. 4A, the main pipe 1 is already disposed through the sheath pipe 2 embedded in the wall body 4. The outer layer portion 7 is mounted in 2 (FIG. 4B). Next, the inner layer portion 8 is attached to the outer peripheral surface 1a of the main pipe 1 by opening the half cut 18 (FIG. 4C). Then, the inner layer portion 8 is slid in the axial direction as it is along the outer peripheral surface 1a of the main pipe 1 (arrow A in FIG. 4) and pushed into the inner peripheral side of the sheath pipe 2, and the main pipe outer peripheral face 1a and the inner peripheral pipe circumference This is performed by closing and fitting the gap 6 with the surface 2a.

  When the central axis of the main pipe 1 is decentered with respect to the central axis of the sheath tube 2, the inner peripheral surface 7 b of the outer layer portion 7 and the outer peripheral surface of the inner layer portion 8, which are interfaces between the outer layer portion 7 and the inner layer portion 8. The angle of fitting with 8a is changed, and the eccentric state is adjusted. When changing the amount of eccentricity, the interface portion which is the surface where the outer layer portion 7 and the inner layer portion 8 are in contact with each other is constituted by a tapered surface, that is, the tip (back) side of the inner layer portion 8 (in FIG. 1). It is formed as a tapered surface that is thin on the right side and thick on the rear end (near side) side (left side in FIG. 1). When inserting the inner layer portion 8, there is a gap between the inner peripheral surface 7 b of the outer layer portion 7 and the outer peripheral surface 8 a of the inner layer portion 8 at the initial insertion of the inner layer portion 8, so that the insertion work is easy. In addition, the inner layer portion 8 can be rotated with respect to the outer layer portion 7.

Further, since the flange portion 14 is formed at the outer peripheral edge portion on the rear end side of the outer layer portion 7, the outer layer portion 7 moves to the back of the sheath tube 2 along with the insertion when the inner layer portion 8 is inserted. Furthermore, since the shape of the half cut 18 is a stepped cut shape and is an uneven shape that fits each other, the half cut portion is displaced along the direction of the central axis. Therefore, there is no possibility that the water-stopping packing material 5 is dropped from the gap between the sheath pipe 2 and the main pipe 1.
Then, at the final stage of the insertion of the inner layer portion 8, the gap between the two layer portions 7 and 8 disappears, and they are in close contact with each other, so that a gap portion between the outer peripheral surface 1a of the main pipe 1 and the inner peripheral surface 2a of the sheath pipe 2 is formed. It will be in the attachment state inserted.

  Thus, according to the annular waterproofing packing material 5 interposed between these gap portions in a state where the main pipe 1 is inserted into the sheath pipe 2 embedded in the concrete wall 3 or the like, it is loose at the beginning of installation. Even if it is in a state, the water expansion portions 10 and 11 of the annular water-stopping packing material 5 expand in the inner and outer peripheral directions, that is, in the center direction and in the radially outer direction due to moisture that has entered between the sheath tube 2 and the outer periphery of the main tube 1. Then, it is in close contact with the inner periphery of the sheath tube 2 and the outer periphery of the main tube 1 to perform a strong water stop action. The expansion of the water expansion portions 10 and 11 of the annular water blocking packing material 5 is largely expanded in the inner and outer peripheral directions because the front and rear non-water expansion portions 12 and 13 prevent the expansion. In addition, there is no inconvenience such as inflating and protruding forward and tearing. Moreover, since the water expansion parts 10 and 11 of a comparatively brittle material are protected by the front and back non-water expansion parts 12 and 13, the handling is easy.

In addition, since the outer water seal portion 5 and the inner layer portion 8 are each eccentric, the annular water blocking packing material 5 can continuously correspond to the eccentric pipeline from the concentric position by changing the fitting state. 2, that is, from the state in which the central axis of the main pipe 1 is eccentric downward as shown in FIG. 2, to the concentric state shown in FIG. 5 and to the upward eccentric state shown in FIG. Continuously variable. Further, since the shape of the half cut 18 is a stepped cut shape and is a concavo-convex shape that fits each other, it is not displaced along the direction of the central axis, and the inner layer with respect to the outer layer portion 7 When the portion 8 is pushed in and inserted, there is no possibility that the water-stopping packing material 5 will drop out from the gap between the sheath pipe 2 and the main pipe 1, and there will be no reduction in the water-stopping effect.
Further, when the outer layer portion 7 and the inner layer portion 8 of the annular water blocking packing material 5 are attached, the center (CL1) with respect to the outer surface 5a which is the outer layer outer peripheral surface 7a and the center of the insertion hole 16 which is the inner layer inner peripheral surface 8b. It is possible to continuously change the amount of eccentricity of the position (CL4) from the concentric state to the most eccentric state, whereby pipes having different eccentricity amounts by one annular water sealing packing material 5 Can be configured.

  In the above-described embodiment, the example in which the shape of the half cut 18 formed in the outer layer portion 7 and the inner layer portion 8 is formed in a substantially V shape has been described. May have other shapes, for example, an example of a combination of rectangular irregularities as shown in FIG. 7, an example of a Z-shape as shown in FIG. 8, as shown in FIG. Any shape may be used as long as it is bent in the direction along the direction of the central axis CL, such as an ant-like shape, and is fitted to each other in the circumferential direction and hardly shifts in the direction of the central axis.

It is sectional drawing of the water stop structure of the pipe line which concerns on embodiment of this invention. It is a front view of the water stop packing material used for the water stop structure. It is a side view of the annular water blocking packing material. It is a schematic sectional drawing which shows the construction procedure of the water stop structure. It is the front view which made the outer-layer part and inner-layer part of the water stop packing material concentric state. It is the front view which made the outer layer part and inner layer part of the water-stopping packing material eccentric state. It is a side view of the waterproofing packing material by other embodiment. It is a side view of the waterproofing packing material by other embodiment. It is a side view of the waterproofing packing material by other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... The other pipe, main pipe 1a ... Outer peripheral surface 2 ... One pipe, sheath pipe 2a ... Inner peripheral surface 3 ... Wall body, such as concrete wall 5 ... Water-proof packing material 5a ... Outer surface 6 ... Gap 7 ... Outer layer part 7a ... outer peripheral surface 7b ... inner peripheral surface 7L, 8L ... maximum thickness portion 7S, 8S ... minimum thickness portion 8 ... inner layer portion 8a ... outer peripheral surface 8b ... inner peripheral surface 10, 11 ... water expansion portion 12, 13 ... non Expansion part 16 ... Insertion hole 18 ... Half cut CL, CL1-CL4 ... Center axis

Claims (5)

An annular water sealing packing material attached to a gap portion between the inner peripheral surface of one tube and the outer peripheral surface of the other tube inserted and disposed in the one tube,
An annular water made of a water-expandable rubber material or a thermoplastic elastomer material, which is composed of an outer layer portion in contact with the one tube and an inner layer portion in contact with the outer peripheral surface of the other tube, and each portion kneading and integrating the water-absorbing resin. An annular non-water expansion part made of a non-water-expandable rubber material or a thermoplastic elastomer material is integrally formed on at least one of the front and rear sides of the expansion part,
The outer layer portion and the inner layer portion are formed by decentering the central axis on the outer peripheral surface and the central axis on the inner peripheral surface, respectively, and have a maximum thickness portion and a minimum thickness portion,
A half cut is formed extending in the radial direction from the insertion hole through which the other pipe is inserted and reaching the outer surface, and the shape of the half cut is bent in the direction along the direction of the central axis to Water-proof packing material characterized by having a stepped cut shape that fits in each direction.   The waterstop packing material according to claim 1, wherein an inner peripheral surface of the outer layer portion and an outer peripheral surface of the inner layer portion, which are interfaces between the outer layer portion and the inner layer portion, are each formed by a tapered surface. In the water stop structure of a pipe line that performs water stop in a gap portion between a sheath pipe that penetrates and is embedded in a concrete wall or the like and constitutes a pipe line, and a main pipe that is inserted through the sheath pipe,
An annular water sealing packing material attached to a gap portion between the inner peripheral surface of the sheath pipe and the outer peripheral surface of the main pipe,
The annular water blocking packing material is composed of an outer layer portion in contact with the sheath tube and an inner layer portion in contact with the outer peripheral surface of the main tube, and each portion is a water-expandable rubber material or thermoplastic elastomer in which a water-absorbing resin is kneaded and integrated. An annular non-water expansion portion made of a non-water-expandable rubber material or a thermoplastic elastomer material is integrally formed on at least one of the front and rear sides of the annular water-expansion portion made of a material,
The outer layer portion and the inner layer portion are formed by decentering the central axis on the outer peripheral surface and the central axis on the inner peripheral surface, respectively, and have a maximum thickness portion and a minimum thickness portion,
A half cut is formed extending in the radial direction from the insertion hole through which the main pipe is inserted and reaching the outer surface, and the shape of the half cut is bent in the direction along the direction of the central axis to be circumferential. A water-stop structure for a pipeline, characterized by having a stepped cut shape that fits together.   When the maximum thickness portion of the outer layer portion and the minimum thickness portion of the inner layer portion overlap each other, the center of the insertion hole is concentric with the center with respect to the outer surface, and the annular water blocking packing material is formed between the outer layer portion and the inner layer portion. 4. The conduit according to claim 3, wherein when the thickest portions overlap each other, the center of the insertion hole is most eccentric with respect to the center with respect to the outer surface, and the amount of eccentricity is continuously variable. Water stop structure.   5. The conduit according to claim 3, wherein an inner peripheral surface of the outer layer portion that is an interface between the outer layer portion and the inner layer portion and an outer peripheral surface of the inner layer portion are each configured by a tapered surface. Water stop structure.

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