JP5069822B2 - Water stop device and water stop structure for corrugated pipe connections - Google Patents

Description

  The present invention relates to a corrugated pipe that houses and protects a wiring material such as a cable, an electric wire, a communication line, a water supply pipe, and a hot water pipe that are buried in the ground, and an end portion of the corrugated pipe It is related with the water stop tool and water stop structure of a corrugated pipe connection part which water-stops the clearance gap with the cylindrical connection port of the pipe joint which is inserted and connected.

  When the corrugated pipe, which is a protective pipe that accommodates and protects the wiring and piping material inside, is buried in the ground, the corrugated pipe end and the pipe joint to which this end is connected are connected. The gap with the cylindrical connection port is required to be waterproof so that water does not enter from the outside. Here, the corrugated pipe has an outer surface formed with ridges parallel to each other along the circumferential direction, and the pipe joint has a cylindrical inner surface formed on a smooth surface. is there. The said clearance gap exists between the outer surface of the edge part of a corrugated pipe, and the inner surface of the connection port of a pipe joint. For example, an end structure of a corrugated tube disclosed in Japanese Patent Application Laid-Open No. 2002-310359 has been disclosed as a watertight seal between the outer surface of a corrugated tube and the inner surface of a connection port of a pipe joint. .

FIG. 11 shows an end structure of a corrugated pipe described in the above publication. In FIG. 11, a connection socket 41 which is a pipe joint connects a corrugated pipe 42 and a straight pipe 43. In the corrugated tube 42, the inner layer 42a is smooth and the outer layer 42b is formed with ridges 42c and recesses 42d alternately and continuously in parallel. On the outer periphery of the end portion of the corrugated tube 42, the receiving port 41a of the connection socket 41 is extrapolated, and a synthetic rubber O-ring 44 is attached to the first concave portion 42d from the insertion end of the corrugated tube 42. In addition, a retaining ring 45 is attached to the adjacent concave surface 42d of the second surface, whereby the receiving port 41a of the connection socket 41 is connected to the corrugated tube 42 in a watertight manner so as to be prevented from being detached, Water is prevented from entering the gap between the outer surface of the corrugated tube 42 and the inner surface of the receiving port 41a of the connection socket 41.
JP 2002-310359 A

  However, in the end structure of the corrugated tube described in the above publication, the O-ring 44 is made of synthetic rubber and has flexibility, and the frictional force with the inner surface of the receiving port 41a of the connection socket 41 is large. When inserting and connecting the end portion of the corrugated tube 42 into the receiving port 41a of the connection socket 41, it was subjected to large insertion resistance and sliding resistance, and could not be smoothly inserted, which was troublesome. Therefore, when connecting the corrugated pipe 42, it is necessary to apply a lubricating oil such as silicon oil to the O-ring 44. Further, since the O-ring 44 is flexible as a whole and unstable in shape, it receives insertion resistance and sliding resistance due to frictional force with the inner surface of the receiving port 41a of the connection socket 41 during insertion at the time of connection. In some cases, the corrugated tube 42 may be pulled out of the concave strip 42d.

  Further, although the connection socket 41 is made of hard polyvinyl chloride resin and has little dimensional variation, the corrugated tube 42 has a large dimensional tolerance and a relatively large dimensional variation. Since it is flexible and its shape is unstable, the overall shape is largely collapsed and is not always stably held in a fixed shape at a fixed position of the concave strip portion 42d of the corrugated tube 42. For this reason, a sufficient pressure contact force may not be ensured between the O-ring 44 and the receiving port 41a of the connection socket 41 or between the O-ring 44 and the corrugated tube 42, and water stoppage in the gap is insufficient. There was. And since it cannot be confirmed from the outside whether the O-ring 44 is stably held at the fixed position of the concave portion 42d of the corrugated tube 42, the receiving port 41a of the connection socket 41 and the corrugated tube 42 When the water stoppage in the gap is insufficient, it is not noticed that the outside dirty water has entered the pipe body, and the continuous use increases the amount of water in the gap. The damage sometimes spread.

  Therefore, the present invention can be stably and smoothly inserted into the connection port of the pipe joint while being attached to the corrugated pipe having outer ribs formed with ridges parallel to each other along the circumferential direction. It is an object of the present invention to provide a water stop device and a water stop structure for a corrugated pipe connection that can reliably stop the gap between the outer surface of the end of the pipe and the inner surface of the connection port of the pipe joint.

The water stop device of the corrugated pipe connecting portion according to claim 1 is fitted between the parallel strips formed along the circumferential direction on the outer surface of the end portion of the corrugated pipe, and the end of the corrugated pipe The portion between the tubular connection port of the pipe joint to which the part is inserted and connected and the corrugated pipe is water-stopped over the entire circumferential direction, and is formed of a divided body made of a hard material, A core material inserted along the circumferential direction between the ridges of the corrugated pipe, and at least an outer surface of the adjacent ridges of the corrugated pipe on the outer surface of the core material and an inner surface of the connection port of the pipe joint It is composed of a water-swellable sheet that absorbs water and is provided at an opposing position. And the said core material is the state in which the edge part of the said corrugated pipe was inserted in the connection port of the said pipe joint, and the said water-swellable sheet | seat with the outer surface between the protruding item | line parts of the said corrugated pipe, and The water-swellable sheet is provided over the entire circumferential direction of the core material.

  In the water stop, the corrugated pipe that is piped by being buried in the ground or the like is connected to a pipe joint such as a hand hole, and the water in the ground is connected to the connection port between the corrugated pipe and the pipe joint. In order to prevent intrusion into the pipe from the gap, the gap is made watertight. This corrugated tube is a protective tube that accommodates and protects wiring and piping materials inside, and is formed of a synthetic resin or the like on the outer surface of which convex strips are formed parallel to each other along the circumferential direction. The pipe joint is generally formed of a hard synthetic resin, and the inner surface of the connection port is formed as a smooth surface. The water stop is fitted from the outside between parallel ridges on the outer surface of the end portion of the corrugated pipe.

  The said water stop consists of a core material inserted between convex strip parts along the circumferential direction of a corrugated pipe, and a water-swellable sheet that absorbs water. The core material, with the end portion of the corrugated pipe inserted into the connection port of the pipe joint, the water-swellable sheet, the self and the outer surface between adjacent ridges of the corrugated pipe, and the self And the inner surface of the connection port of the pipe joint. Therefore, the core material is usually formed of a hard synthetic resin or the like, and is hard and has a generally stable shape. Here, the outer surface between adjacent ridges of the corrugated tube corresponds to the side wall surface of the ridges and the bottom wall surface of the ridges between the ridges. Further, the core material may sandwich the water-swellable sheet with both of the opposing outer surfaces in the clamping pressure with the opposing outer surface between the adjacent ridges of the corrugated tube. You may clamp between either one.

  On the other hand, the water-swellable sheet has compressibility and elasticity, has a property of absorbing water and swells, and is formed of a nonwoven fabric, a woven fabric, a foamed resin, or the like. Among these, non-woven fabrics are particularly slippery and easy to slide, and are easily compressed, so that a corrugated pipe fitted with a water stop can be smoothly inserted into a connection port of a pipe joint and connected, and a water-swellable sheet As best. Since the water-swellable sheet absorbs water and swells, the water-stopping effect is enhanced. That is, when the water-swellable sheet is not provided on the core material, the water stop is formed only of the hard core material, so the outer surface of the ridge portion of the corrugated pipe or the connection port of the hard pipe joint A slight gap is likely to be formed on the contact surface with the inner surface of the water, and watertightness is incomplete. However, since the water-swellable sheet is provided on the outer surface of the core material, it is compressed on the outer surface of the ridge portion of the corrugated tube and the inner surface of the connection port of the hard pipe joint due to its compressibility and elasticity. In close contact with these surfaces, when water enters the gap, it absorbs and swells, so that the close contact force increases and the water tightness is improved. Since the water-swellable sheet is provided over the entire circumferential direction of the core material, the water is stopped over the entire circumferential direction of the tube body. Here, the circumferential direction of the core material means not the circumferential direction in the cross section of the core material but the circumferential direction of the entire core material corresponding to the outer periphery of the corrugated tube.

Since the waterstop is formed of a divided body , it can be fitted between the protruding strips from the outside perpendicular to the tube axis of the corrugated pipe, and generally fitted from two directions as a two-divided body. Can do. Of course, the present invention is not limited to this, and the water stop device may be formed of three or more divided bodies, or may be integrated by rotatably connecting the ends of the two divided bodies with hinges or the like. .

The water stop device of the corrugated pipe connecting portion according to claim 2 is connected to the outer surface between adjacent convex portions of the corrugated pipe and the pipe joint when the end of the corrugated pipe is inserted into the connection port of the pipe joint. The portion pressed against the inner surface of the mouth protrudes excessively by the compression allowance. Here, the “compression allowance” may be provided only in the water-swellable sheet, or may be provided together with the core material, and as long as it is provided as a whole water stop device.
In the waterstop for the corrugated pipe connecting portion according to the third aspect, the side surface facing the side wall of the convex strip portion of the corrugated pipe is formed as an inclined surface that matches the tilt angle of the side wall of the convex strip portion.

Water stop device of corrugated pipe connection of claim 4, the contact surface abutting against the end face of the core members to each other circumferentially, the water pressure-contact with each other in a state fitted to the between ridges of the corrugated tube A swellable sheet is further provided. As described above, the waterstop can be inserted between the protruding strips from the outside perpendicular to the tube axis of the corrugated pipe as a divided body, but at that time, the circumferential contact of each divided body A water-swellable sheet is also provided on this abutting surface in order to increase the water-stopping property on the surface. Here, the water-swellable sheet provided on the contact surface in the circumferential direction of each core member is provided on the outer surface of the core member at a position facing the convex portion of the corrugated pipe and the inner surface of the connection port of the pipe joint. The above-mentioned water-swellable sheet is preferably made of the same material from the viewpoint of production and cost, but may be made of a different material.

The water stop structure of the corrugated pipe connecting portion according to claim 5 is configured such that an end portion of the corrugated pipe in which convex strip portions parallel to each other along the circumferential direction are formed on the outer surface, and an end portion of the corrugated pipe are inserted. A tubular connection port of a pipe joint to be connected, and a water stop device that stops water over the entire circumferential direction through a gap between the end portion of the corrugated pipe inserted into the connection port and the connection port. The water stop device is formed of a divided body made of a hard material, and includes a core material inserted along the circumferential direction between the ridges of the corrugated pipe, and water that absorbs water. It consists of a swellable sheet. And the said water-swellable sheet is provided in the location which opposes the outer surface between the adjacent protruding strip parts of the said corrugated pipe and the inner surface of the connection port of the said pipe joint in the outer surface of the said core material, In the state where the end portion of the corrugated pipe is inserted into the connection port of the pipe joint, the water-swellable sheet is connected to the outer surface between the ridges of the corrugated pipe, and the connection port of the pipe joint It has the rigidity to clamp with the inner surface.
The water stop structure of the corrugated pipe connecting portion according to claim 6 is configured such that an end portion of the corrugated pipe in which convex strips parallel to each other along the circumferential direction are formed on the outer surface, and an end portion of the corrugated pipe are inserted. The cylindrical connection port of the pipe joint to be connected, and the gap between the end portion of the corrugated pipe inserted into the connection port and the connection port is water-stopped over the entire circumferential direction. The water stop tool according to any one of Items 4 is provided.

In the inventions of claim 1, claim 5 and claim 6, the core material of the water stop is formed of a divided body made of a hard material, and the outer surface between adjacent protruding strips of the corrugated pipe, and the pipe Since it has the rigidity to sandwich the water-swellable sheet with the inner surface of the joint connection port, the water stop can be smoothly and stably fitted between the ridges of the corrugated tube. Can be smoothly and easily inserted into the pipe joint, and the shape is stable, so that it can be reliably inserted and connected without being pulled out from between the ridges of the corrugated pipe. The water-swellable sheet provided on the outer surface of the core material has compressibility and elasticity, absorbs water, and swells. Therefore, after connection to the connection port of the pipe joint, It is pressed against the outer surface between the strips and the inner surface of the connection port of the pipe joint, and more strongly pressed by absorbing and swelling water that has entered the gap between the corrugated pipe and the connection port of the pipe joint. . As a result, water tightness of the gap can be ensured and water can be reliably stopped.

In the invention according to claim 2, the portion pressed against the outer surface between the adjacent ridges of the corrugated pipe and the inner surface of the connection port of the pipe joint protrudes outward excessively by the compression allowance. Is strongly pressed by the outer surface and the inner surface, and the water stop effect is increased.
In the invention of claim 3, since the side surface facing the side wall of the ridge portion of the corrugated tube is formed on an inclined surface that matches the inclination angle of the side wall of the ridge portion, the entire side portion of the water stop device However, it is in close contact with the side wall of the ridge portion of the corrugated tube, the water stop area is increased, and the water stop effect is increased.
In the invention of claim 4, since the water-swellable sheet is further provided on the circumferential contact surface of each core member formed of the divided bodies, the water stoppage on the circumferential contact surface of each divided body is prevented. It can be done reliably.

Hereinafter, a water stop device and a water stop structure of a corrugated pipe connecting portion according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. Here, FIG. 1 shows the water stop device of the embodiment of the present invention, FIG. 2 shows the core material of the water stop device, and FIGS. 3 and 4 show the corrugated tube to which the water stop device is attached and this wave. The connection port of the pipe joint to which the attached pipe is connected is shown, and FIG.
1 to 5, the water stop 1 includes a connection port 23 of a pipe joint 21 whose one end is embedded in a concrete wall 32 of a hand hole 31 embedded in the ground shown in FIG. 4, and this connection. The gap S is stopped in order to prevent underground water from entering the inside of these pipes from the gap S with the corrugated pipe 11 inserted and connected to the opening 23. The waterstop 1 is attached to the outer surface of the core material 2 and the core material 2 inserted from the outside between the protruding strips 12 along the circumferential direction of the end portion of the corrugated tube 21, and absorbs water. And a water-swellable sheet 3. The water stop 1, the end portion of the corrugated pipe 11, and the connection port 23 of the pipe joint 21 constitute a water stop structure of the corrugated pipe 11.

  First, the corrugated pipe 11 is a protective pipe that accommodates and protects wiring and piping materials therein, and is buried in the ground. As shown in FIG. 4, the corrugated tube 11 is formed with convex strips 12 parallel to each other along the circumferential direction on the outer surface, and a concave strip 15 is formed between the convex strips 12. That is, the outer surface of the corrugated tube 11 is formed with the ridges 12 and the ridges 15 alternately in the longitudinal direction, and the ridges 12 include a slightly inclined side wall 13 and a flat top wall 14. The concave stripe portion 15 between the convex stripe portions 12 has a bottom wall 16 at the bottom. The outer surface of the side wall 13 of the ridge 12 and the outer surface of the bottom wall 16 of the ridge 15 correspond to the outer surfaces between adjacent ridges 12 in the claims. The corrugated tube 11 is formed of a synthetic resin in a square shape and has flexibility.

  Next, as shown in FIGS. 3 to 5, the pipe joint 21 is formed of a hard synthetic resin and is open at both ends. The pipe joint 21 includes an embedded portion 22 embedded in the concrete wall 32 of the handhole 31 and a connection port 23 that protrudes outward from the surface of one side of the concrete wall 32 perpendicularly thereto. The connection port 23 is formed in a rectangular tube shape corresponding to the outer diameter size and shape of the corrugated tube 11, the inner wall is formed with a smooth surface, and the corrugated tube 11 is inserted and connected to the inside through the opening. It is like that. A step portion 24 is formed at the connecting portion between the embedded portion 22 and the connection port 23, and the corrugated tube 11 can be inserted until it hits the step portion 24. A straight engagement groove hole 25 penetrating inward and outward is formed in the upper wall and the bottom wall of the connection port 23, and a side portion 34 of a retaining ring 33 to be described later is elastic in the engagement groove hole 25. Thus, the corrugated tube 11 inserted and connected to the connection port 23 is prevented from coming off.

  Next, as shown in FIG. 1, the waterstop 1 of the present invention is formed by adhering a water-swellable sheet 3 to a core material 2, and the whole is substantially U-shaped by an intermediate portion 1 a and both side portions 1 b. The cross-sectional shape is also formed symmetrically. When the waterstop 1 is fitted between the ridges 12 of the corrugated tube 11, it is attached to the half-circumferential portion of the corrugated tube 11, and the entire circumference of the corrugated tube 11 is inserted by inserting a pair of left and right. It will be attached to the part. That is, the water stop tool 1 is in the form of a split body divided into two with respect to the entire circumference of the corrugated tube 11. Here, since the water stop 1 is entirely left-right symmetric and each cross-sectional shape is also left-right symmetric, the left and right can be interchanged by reversing. Also, it can be arbitrarily arranged.

  First, as shown in FIG. 2, the core material 2 of the waterstop 1 is formed of a hard synthetic resin such as polypropylene, and the end portion of the corrugated pipe 11 is inserted into the connection port 23 of the pipe joint 21. The water-swellable sheet 3 is rigidly sandwiched between the core material 2 and the ridge portion 12 of the corrugated tube 11 and is sandwiched between the core material 2 and the inner surface 23a of the connection port 23 of the pipe joint 21. ing. The outer peripheral surface 2 a of the core member 2 is formed in a shape and size that substantially match the outer surface shape and outer dimensions of the top wall 14 of the ridge portion 12 of the corrugated tube 11. Further, three narrow grooves 2d are formed in parallel on the both side surfaces 2b along the circumferential direction. The both side surfaces 2b are formed as inclined surfaces. Specifically, the second and third protrusions 2e from the outer peripheral surface 2a side are formed adjacent to both sides of the narrow groove 2d in the circumferential direction. The projecting end surface 2f is formed as an inclined surface whose projection amount is slightly reduced toward the inner side of the water stop 1, and this inclined surface is slightly on both side walls 13 of the ridge portion 12 of the corrugated tube 11. It is formed at an inclination angle that coincides with the inclined surface that is inclined in the direction. The inner peripheral surface 2 c of the core material 2 is formed in a flat surface corresponding to the bottom surface of the concave strip portion 15 of the corrugated tube 11.

  Next, the water-swellable sheet 3 is located on the outer surface of the core 2 facing the side wall 13 of the ridge portion 12 of the corrugated tube 11 and the inner surface 23a of the connection port 23 of the pipe joint 21, that is, in FIG. The core material 2 is adhered to the outer peripheral surface 2 a and both side surfaces 2 b and is adhered to the entire circumferential direction of the core material 2. Further, the water-swellable sheet 3 is in contact with the circumferential contact surface 2g of the core material 2, that is, the left and right core materials 2 are in contact with each other in a state of being fitted between the ridges 12 of the corrugated tube 11. It is also attached to the end face. The water-swellable sheet 3 is composed of a sheet material made of a non-woven fabric having a constant thickness, and the outer peripheral surface 2a and both side surfaces 2b of the core material 2 and the contact surface in the circumferential direction by means such as bonding with an adhesive or double-sided adhesive tape. Attached to 2g integrally. The nonwoven fabric has compressibility, elasticity, and lubricity, and has a property of absorbing water and swelling. Here, since the both side surfaces 2b of the core material 2 are formed in the inclined surface where the width | variety of the core material 2 becomes small as it goes to the inner side of the water stopping tool 1, the water affixed on the side surface 2b The swellable sheet 3 is also inclined, and the inclination angle is formed so as to coincide with the inclined surfaces of the both side walls 13 of the ridge 12 of the corrugated tube 11. Therefore, the water-swellable sheet 3 adhered to the both side surfaces 2 a of the core material 2 is attached to the both side surfaces 2 b of the core material 2 when the water stop 1 is inserted between the ridges 12 of the corrugated tube 11. Almost all of the pasted portions are in close contact with the side walls 13 of the ridges 12 of the corrugated tube 11.

  Furthermore, the water-swellable sheet 3 has a predetermined thickness, and the width of the water stop 1 to which the water-swellable sheet 3 is stuck is inserted between the ridges 12 of the corrugated tube 11. In the state where it is not, it is formed slightly larger than the width of the concave portion 15 of the corrugated tube 11. In other words, in the water stop tool 1, the water-swellable sheet 3 protrudes sideways excessively by the compression allowance in the width direction. Further, in the water stop 1, when the corrugated pipe 11 is not connected to the connection port 23 of the pipe joint 21, the outer dimension L1 of both side portions 1b shown in FIG. 1 (c) is shown in FIG. 5 (a). It is formed slightly larger than the inner dimension L2 of the connection port 23 of the pipe joint 21, and the water-swellable sheet 3 is excessively projected outward by a compression allowance corresponding to (L1-L2) / 2 in the height direction. Yes. For this reason, the water-swellable sheet 3 has a strong pressure contact force in a state in which the waterstop 1 is inserted between the ridges 12 of the corrugated pipe 11 and the corrugated pipe 11 is connected to the connection port 23 of the pipe joint 21. Thus, the pressure is sandwiched between the core material 2 and the ridge portion 12 of the corrugated pipe 11, and the pressure is sandwiched between the core material 2 and the inner surface 23 a of the connection port 23 of the pipe joint 21. Each compression allowance may include not only the compression amount of the water-swellable sheet 3 but also the compression amount due to elastic deformation of the core material 2.

Next, an operation of fitting the waterstop 1 configured as described above between the ridges 12 of the corrugated pipe 11 and connecting the corrugated pipe 11 to the connection port 23 of the pipe joint 21 will be described.
First, as shown in FIG. 3, the pair of right and left water stop devices 1 are fitted between the protruding strips 12 of the corrugated tube 11 from the left and right sides, that is, into the concave strips 15. At this time, since the water-swellable sheet 3 of the water-stopper 1 that is adhered to both side surfaces 2b of the core member 2 protrudes outwardly by the compression allowance, the ridge portion of the corrugated tube 11 12 is in pressure contact with the side wall 13 and receives sliding resistance, but is fitted against it. Here, the inclined surfaces of the both side portions 1 b of the water stop 1 are formed at an inclination angle that matches the inclined surface of the side wall 13 of the ridge 12 of the corrugated tube 11, and the water stop 1 is provided with the corrugated tube 11. The inner circumferential surface 2c reaches the bottom surface of the concave strip portion 15 of the corrugated tube 11 or the vicinity thereof. By this insertion, the water stop 1 is attached to the entire circumference of the corrugated pipe 11 as a pair. In addition, as shown in FIG. 3, the corrugated tube is formed while elastically expanding both the left and right side portions 34 of the retaining ring 33 made of synthetic resin, which is partially cut out and formed in a substantially horseshoe shape. 11 is inserted between the ridges 12 at different positions.

  When the pair of waterstops 1, 1 and the retaining ring 33 are fitted between the ridges 12 of the corrugated pipe 11, the end of the corrugated pipe 11 is connected to the connection port 23 of the pipe joint 21 as shown in FIG. 4. Insert until the tip contacts the stepped portion 24 of the connecting portion between the embedded portion 22 and the connection port 23. At this time, since the water-swellable sheet 3 of the water-stopper 1 that is adhered to the outer peripheral surface 2a of the core member 2 protrudes outwardly by the compression allowance, the connection port 23 of the pipe joint 21 It is pressed against the inner surface 23a and receives sliding resistance, but is inserted against it. The retaining ring 33 protrudes outward from the top wall 13 of the ridge portion 12 of the corrugated pipe 11 as the end of the corrugated pipe 11 is inserted into the connection port 23 of the pipe joint 21. The formed both side portions 34 are pressed against the inner surface 23 a of the connection port 23 of the pipe joint 21 and elastically stored in the concave portion 15 of the corrugated pipe 11, and the corrugated pipe 11 is connected to the connection port 23 of the pipe joint 21. It becomes possible to enter inside. Therefore, when the retaining ring 33 reaches the engagement groove hole 25 provided on the outer wall of the connection port 23, the curved side portions 34 are elastically opened and inserted into the engagement groove hole 25, The corrugated tube 11 is stopped and is prevented from coming off. Thereby, the connection work of the corrugated pipe 11 to the connection port 23 of the pipe joint 21 is completed.

  When the connection of the corrugated tube 11 is completed, as shown in FIG. 5, the water stop 1 is in a state where both side portions 1 b are in pressure contact with the side wall 13 of the ridge portion 12 of the corrugated tube 11. Is pressed and compressed strongly between the core material 2 and the side wall 13 of the ridge portion 12 of the corrugated tube 11, and the intermediate portion 1a is in a state of being pressed against the inner surface 23a of the connection port 23 of the pipe joint 21, The water-swellable sheet 3 is strongly compressed by the core material 2 and the inner surface 23a of the connection port 23 and compressed. Therefore, as shown by the arrow in FIG. 5 (b), the water that has entered the inside from the end opening of the connection port 23 of the pipe joint 21 is the pressure contact location of the side portion 1b and the pressure contact location of the intermediate portion 1a. Further, the gap S between the corrugated pipe 11 and the connection port 23 of the pipe joint 21 is further prevented from entering the corrugated pipe 11 and the pipe joint 21.

Next, the effect | action of the water stop tool 1 is demonstrated.
The waterstop 1 is formed of a core material 2 inserted between the ridges 12 of the corrugated tube 11 and a water-swellable sheet 3 attached to the outer surface of the core material 2. Here, if the core material 2 is formed of a flexible material and is formed of a material with low rigidity, the connection port 23 of the pipe joint 21 is inserted when the corrugated pipe 11 is inserted into the connection port 23 of the pipe joint 21. The contact portion with the inner surface 23a of the connection port 23 is easily deformed by receiving the sliding resistance of the inner surface 23a, and a part of the inner surface 23a of the connection port 23 and the top wall 14 of the ridge portion 12 of the corrugated tube 11 are easily deformed. May squeeze into the gap S and cannot be inserted smoothly. Further, after the corrugated tube 11 is inserted, the core material 2 is in contact with the abutting portion of the corrugated tube 11 with the side wall 13 of the ridge 12 and the inner surface 23 a of the connection port 23 of the pipe joint 21. The portion is only compressed and retracted to the inner side. Therefore, the water-swellable sheet 3 is made of the core material 2 and the outer wall 13 of the ridge portion 12 of the corrugated pipe 11, and the core material 2 and the pipe joint 21. The inner surface 23a of the connection port 23 cannot be firmly sandwiched and pressed, and therefore, the water stoppage of the gap S between the corrugated tube 11 and the connection port 23 of the pipe joint 21 is insufficient.

  However, in the waterstop 1 of the present embodiment, the core material 2 is formed of a hard material of a hard synthetic resin, and the convex strip portion 12 of the corrugated pipe 11 and the inner surface 23a of the connection port 23 of the pipe joint 21 Since the water-swellable sheet 3 is rigid enough to hold the water-swellable sheet 3, the contact portion will not be deformed even if it receives sliding resistance from the inner surface 23 a of the connection port 23 of the pipe joint 21. Since the sheet 3 has lubricity, the corrugated pipe 11 fitted with the water stop 1 can be smoothly and easily inserted into the connection port 23 of the pipe joint 21. Moreover, since the shape of the water stop tool 1 is stable, the water stop tool 1 is reliably inserted and connected without being removed from between the ridges 12 of the corrugated tube 11. Furthermore, although the above demonstrated the case where the corrugated pipe 11 was inserted in the connection port 23 of the pipe joint 21, the water stop tool 1 of the corrugated pipe 11 is provided with the core material 2 having predetermined rigidity. Even when it is inserted between the ridges 12, it can be carried out smoothly and reliably.

  And after inserting and connecting the corrugated pipe 11 to the connection port 23 of the pipe joint 21, the water-swellable sheet 3 is formed between the core material 2 and the ridges 12 of the corrugated pipe 11 due to the rigidity of the core material 2. The side wall 13 and the core member 2 and the inner surface 23a of the connection port 23 of the pipe joint 21 are strongly sandwiched and pressed. In addition, the water-swellable sheet 3 has compressibility and elasticity, and the compression margin projects excessively outward, so that the connection between the side wall 13 of the ridge portion 12 of the corrugated pipe 11 and the pipe joint 21 is achieved. It is strongly pressed by the inner surface 23a of the mouth 23. Further, the water-swellable sheet 3 is formed of a non-woven fabric, absorbs water, and swells. Therefore, the water-swellable sheet 3 absorbs water that has entered the gap S between the corrugated pipe 11 and the connection port 23 of the pipe joint 21 and temporarily absorbs the water. Accumulate and hold. Further, the water-swellable sheet 3 absorbs water and swells, expands into the gap S between the corrugated pipe 11 and the connection port 23 of the pipe joint 21, and is strongly pressed against these wall surfaces. As a result, even if there is a slight variation in the height of the top wall 14 of the ridge portion 12 of the corrugated tube 11 due to the crossing of the size, the variation in the size is absorbed, and the water stop 1 has the corrugated tube 11 and the tube. It is in close contact with the wall surface of the connection port 23 of the joint 21. And the water-swellable sheet 3 is stuck over the whole circumferential direction of the core material 2. As a result, the entire circumference of the corrugated tube 11 is reached, the water tightness in the gap S can be sufficiently secured, and water can be reliably stopped.

  In addition, since the water-swellable sheet 3 is further adhered to the circumferential contact surface 2g of each core member 2 formed of two divided bodies, a gap between the circumferential contact surfaces 2g of each divided body The water-tight state can be ensured, and water can be reliably stopped at the contact portion.

  Furthermore, since the water stop 1 is formed in the inclined surface in which the side part 2b facing the side wall 13 of the convex part 12 of the corrugated pipe 11 corresponds to the inclination angle of the side wall 13 of the convex part 12. The entire side portion 2b is in close contact with the side wall 13 of the ridge portion 12 of the corrugated tube 11, the water stop area can be increased, and the water stop effect is increased.

And since the water-swellable sheet 3 is stuck so that it may coat | cover from the outside on the outer surface of a total of three places, the outer peripheral surface 2a of the core material 2, and both side surfaces 2b, it uses an adhesive agent and a double-sided adhesive tape. The outer surface of the core material 2 can be simply applied by simply covering and pressing, and can be reliably attached to a predetermined location.
In addition, since the water stop tool 1 is used when connecting the corrugated pipe 11 to the pipe joint 21, it can be stored in a bag or the like until immediately before connection, and water absorption before use can be suppressed as much as possible. it can. Thereby, it can prevent that the water absorption amount by the water-swellable sheet 3 after a connection reduces, and can suppress the fall of water absorption capability.

  In addition, since the narrow groove 2d is formed along the circumferential direction on both side surfaces 2b of the core material 2 and the protrusions 2e are formed, the core material reduces the material cost and reduces the weight by the uneven cross-sectional shape. 2 can be increased in rigidity.

  By the way, in the said embodiment, the pair of right and left waterstops 1 contact | abut the contact surface 2g of the circumferential direction in the state inserted between the protruding item | line parts 12 of the corrugated tube 11, and are stuck on this part. The water-swellable sheet 3 is in pressure contact and water stop is ensured at the contact portion between the two water stop devices 1. For example, as shown in FIG. Are connected to each other, and the water stoppers 1 are assembled together to prevent both the water stoppers 1 from being separated from each other and to increase the pressure contact strength of the water-swellable sheet 3 on the contact surface 2g. In addition, the water stoppage can be further increased. In FIG. 6, the water-swellable sheet 3 is attached to the abutment surface 2g of one waterstop 1 on the almost half on the outer peripheral surface 2a side, and the half on the inner peripheral surface 2c side is attached to the tip. An engaging projection 2h having a joint claw 2i is integrally projected toward the abutting surface 2g of the other water stop 1 facing thereto. Similarly, a water-swellable sheet 3 is adhered to approximately half of the outer peripheral surface 2a on the contact surface 2g of the other water stop 1, and the one water stop is disposed on approximately half of the inner peripheral surface 2c. An engagement hole 2j for engaging one engagement protrusion 2h is formed, and a claw engagement hole 2k for engaging the engagement claw 2i of the engagement protrusion 2h is formed on the back side. The opposite contact surface 2g of one water stop 1 is formed with an opposite engagement hole 2j and a claw engagement hole 2k, and the other contact surface 2g of the other water stop 1 is formed on the contact surface 2g. An opposite engaging projection 2h is formed. Therefore, it is not necessary to prepare two types of the water stop tool 1.

  Further, as shown in FIG. 7, the fitting protrusion 2 l is formed on the abutting surface 2 g of the other water stopping device 1 facing the substantially half of the abutting surface 2 g of the one water stopping device 1 on the inner peripheral surface 2 c side. Projecting integrally, and having an opening slightly smaller than the fitting projection 2l in the substantially half of the contact surface 2g of the other waterstop 1 on the inner peripheral surface 2c side, the fitting projection 21 is elastic. It is also possible to form a fitting recess 2m that fits together and to assemble both the waterstops 1 together. In the case of the water stop 1, the fitting protrusion 2l is forcibly fitted to the fitting recess 2m so as to be integrally assembled, and the pressure contact force between the water-swellable sheets 3 on each contact surface 2g is increased. In addition, when it is desired to remove the water stop 1 that has been fitted and attached to the corrugated pipe 11, the tip of a tool such as a flat-blade screwdriver is squeezed between the ridges 12 of the corrugated pipe 11. The waterstops 1 can be separated from each other and removed from the corrugated tube 11.

  Further, the water stop device 1 shown in FIGS. 6 and 7 is assembled by pressing together between the ridges 12 of the corrugated pipe 11 as shown in FIG. You can also. That is, the waterstop 1 has a slightly larger width at the top of the cross section and a small height as shown in FIG. 8, and the inner peripheral surface 2c is not fitted to the bottom surface of the concave portion 15 of the corrugated tube 11 or the vicinity thereof. Even if it is a thing, when a pair is assembled | attached, it press-contacts to the side wall 13 of the protruding item | line part 12 of the corrugated tube 11 in the upper press-contacting location P, and is stably attached to the corrugated tube 11. In addition, although the water stop tool 1 in FIG. 8 has shown what reduced height, even if it is the same height as the water stop tool 1 shown in FIG.6, FIG.7 etc., it is the same. In addition, by assembling the pair, they can be press-fitted between the ridges 12 of the corrugated tube 11 and attached at the same time.

  Next, the waterstop 1 is pressed against the side wall 13 of the ridge portion 12 of the corrugated pipe 11 and the inner surface 23 a of the connection port 23 of the pipe joint 21, thereby connecting the corrugated pipe 11 and the connection port 23 of the pipe joint 21. The gap S is stopped. Therefore, the water-swellable sheet 3 faces the side wall 13 and the bottom wall 16 between the adjacent ridges 12 of the corrugated tube 11 in the core material 2 between the ridges 12 of the corrugated tube 11. It may be attached to any location. The water stop 1 of FIG. 9 (a) shows that the water-swellable sheet 3 is stuck to the insertion side of the two side surfaces 2b of the core material 2. In the case of this water stop 1, When the attachment tube 11 is inserted into the connection port 23 of the pipe joint 21, an effect that it is difficult to peel off from the core material 2 is obtained. Moreover, the water stop tool 1 of FIG.9 (b) shows what the water-swellable sheet | seat 3 is provided in the water infiltration side among the both sides 2b of the core material 2, and in the case of this water stop tool 1 Is effective in preventing water from entering upstream. In consideration of these, it is desirable that the water-swellable sheet 3 is adhered to both side surfaces 2b of the core material 2 between the ridges 12 of the corrugated tube 11 as in this embodiment. In this case, there is also an effect that the water stop tool 1 can be fitted between the convex portions 12 of the corrugated pipe 11 in any direction. Furthermore, the water-swellable sheet 3 may be attached to the outer peripheral surface 2 a and the inner peripheral surface 2 c of the core material 2, or may be attached to the entire surface of the core material 2. When the water-swellable sheet 3 is attached to the entire surface of the core material 2, it is more difficult to peel off. In addition, in FIG. 9, the arrow shows the infiltration direction of water.

Moreover, although the water stop tool 1 of the said embodiment is inserted between the protruding item | line parts 12 from the outer side orthogonal to the pipe axis of the corrugated pipe | tube 11 as a 2-part body, it is 3 parts or more, for example, equal 4 It is good also as what was formed in the substantially L-shape divided | segmented.
Furthermore, although the water stop tool 1 is formed as a pair of left and right independent separate bodies, the water stop tool 1 may be integrally connected by a hinge or the like.
In addition, the water stop 1 is formed so as to have a square frame shape when the pair is combined, corresponding to the shapes of the corrugated pipe 11 and the connection port 23 of the pipe joint 21. When the shape of the connection port 23 of the pipe 11 and the pipe joint 21 is circular, the whole is formed in an annular frame shape correspondingly.
And the side surface 2b facing the side wall 13 of the ridge part 12 of the corrugated tube 11 is formed in the inclined surface which corresponds to the inclination angle of the side wall 13 of this ridge part 12, but it is not restricted to this. Instead, as shown in FIG. 9 (c), the inclination angle of the side wall 13 of the ridge 12 may be different. In this case, the side part 1b of the water stop tool 1 is pressed against the side wall 13 of the ridge part 12 of the corrugated pipe 11 at, for example, the upper pressure contact point P.

  In the core material 2 of the above embodiment, a plurality of fine grooves 2d are formed on both side surfaces 2b. However, the fine grooves 2d may not be formed, and both side surfaces 2b may be simply flat surfaces. Good. Further, the outer peripheral surface 2a and both side surfaces 2b of the core member 2 may be formed in a curved shape that bulges outward as shown in FIG. 9 (d). In this case, the waterstop 1 is surely and more strongly pressed against the inner surface 23a of the connection port 23 of the pipe joint 21 or the side wall 13 of the ridge portion 12 of the corrugated pipe 11 at any pressure contact point P on the curved surface. , The water stop effect becomes larger. Further, as shown in FIG. 9 (e), the small protrusion 2 n protruding outward is projected along the circumferential direction of the water stopping device 1 at one of the outer peripheral surface 2 a and both side surfaces 2 b of the core member 2. You may set up. Also in this case, since the water stop tool 1 strongly presses in the press-contact location P with the inner surface 23a of the connection port 23 of the pipe joint 21, or the side wall 13 of the convex part 12 of the corrugated pipe 11, the water stop effect is further increased. be able to.

  Furthermore, in the water stop tool 1 in each of the above embodiments, the water-swellable sheet 3 is bonded to the core material 2 using an adhesive, a double-sided adhesive tape, and the like, and then between the ridges 12 of the corrugated tube 11. However, the water-swellable sheet 3 is not limited to attachment by the attaching means, and may be provided integrally with the core material 2 by other attachment. Further, instead of being integrally provided in advance, as shown in FIG. 10, after the water-swellable sheet 3 is first placed between the ridges 12 of the corrugated tube 11, the core material 2 is water-swellable. The water stop 1 is fitted from the outside of the sheet 3 between the ridges 12 of the corrugated tube 11 and the water swellable sheet 3 is formed between the core 2 and the outer surface of the corrugated tube 11 between the ridges 12. It is good also as what clamps. In this case, at the connection port 23 of the pipe joint 21, the water-swellable sheet 3 moves from the concave strip portion 15 of the corrugated pipe 11 to the outside as the corrugated pipe 11 is inserted into the connection port 23 of the pipe joint 21. One end side in the width direction protruding in the direction is pressed by the inner surface 23 a of the connection port 23 of the pipe joint 21, and is sandwiched between the outer peripheral surface 2 a of the core member 2 and the inner surface 23 a of the connection port 23 of the pipe joint 21. .

In addition, although the core material 2 is formed with hard synthetic resins, such as a polypropylene, when implementing this invention, you may form with hard materials, such as a metal material and a timber.
Moreover, although the water-swellable sheet 3 of the said embodiment is formed with the nonwoven fabric, it is not restricted to this, It can also form with a woven fabric, foamed resin, etc.
Further, the water-swellable sheet 3 has the same sheet adhered to the outer peripheral surface 2a and both side surfaces 2b of the core member 2 and the contact surface 2g which is the end surface in the circumferential direction. Further, the thicknesses may be different from each other.

In addition, the water stop tool 1 has the end portion of the corrugated tube 11 connected to the connection port 23 of the pipe joint 21 in which one end portion is embedded in the concrete wall 32 of the hand hole 31 embedded in the ground. However, the present invention can be similarly applied to the one connected to the other pipe joint 21.
Further, the water stop device 1 of the above embodiment prevents water from entering the gap S between the end of the corrugated pipe 11 and the connection port 23 of the pipe joint 21 from the outside. When water flowing through the inside of the tube leaks into the gap S, the water is further prevented from leaking out of the tube.

The water stop of the corrugated pipe connection part of embodiment of this invention is shown, (a) is a front view, (b) is sectional drawing by the AA cut line of (a), (c) is (b) It is sectional drawing by a BB cutting line. 1 shows the core material of FIG. 1, (a) is a front view, (b) is a cross-sectional view taken along the line CC of (a), and (c) is an enlarged view of a D part of (b). It is a perspective view which shows the connection port of a corrugated pipe and a pipe joint to which the water stop tool of FIG. 1 is applied. It is a side view which shows the corrugated pipe and pipe joint of FIG. The water stop state when the corrugated pipe | tube which inserted the water stop tool of FIG. 1 is connected to the connection port of a pipe joint is shown, (a) is a partially broken side view, (b) is a principal part expanded sectional view. . The water stop of another embodiment of this invention is shown, (a) is a perspective view of the principal part, (b) is a front view. It is a perspective view of the principal part which shows the modification of the water stop tool of FIG. It is a principal part expanded sectional view which shows the state which connected the corrugated pipe | tube which inserted the water stop tool of FIG. 6 or FIG. 7 to the connection port of a pipe joint. It is a principal part expanded sectional view which shows the state which connected the corrugated pipe | tube which inserted the various water stop tools of another modification of FIG. 1 to the connection port of a pipe joint. It is a principal part expanded sectional view which shows the state which inserted another water stop of FIG. 1 between the protruding item | line parts of a corrugated pipe. It is sectional drawing of the water stop tool of the conventional corrugated pipe connection part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water stop tool 2 Core material 2a Outer peripheral surface 2b Side surface 3 Water-swellable sheet 11 Corrugated pipe 12 Projection part 13 Side wall 21 Pipe joint 23 Connection port 23a Inner surface S Gap between the corrugated pipe and the connection port of the pipe joint

Claims (6)

A cylindrical connection port of a pipe joint that is inserted between the parallel strips formed along the circumferential direction on the outer surface of the end portion of the corrugated tube and into which the end portion of the corrugated tube is inserted and connected And a water stop device for a corrugated pipe connecting portion that stops water across the entire circumferential direction between the corrugated pipe and the corrugated pipe,
A core member formed of a divided body made of a hard material, and fitted along the circumferential direction between the protruding strips of the corrugated tube;
It comprises a water-swellable sheet that absorbs water, provided at least on the outer surface of the corrugated tube on the outer surface of the corrugated tube and the inner surface of the connection port of the pipe joint.
The core material includes the water-swellable sheet in a state in which an end portion of the corrugated pipe is inserted into a connection port of the pipe joint, and the outer surface between the ridges of the corrugated pipe, and the pipe It has the rigidity to clamp with the inner surface of the joint connection port,
The water-swelling device for corrugated pipe connections, wherein the water-swellable sheet is provided over the entire circumferential direction of the core member.   When the end portion of the corrugated pipe is inserted into the connection port of the pipe joint, the outer surface between adjacent convex strips of the corrugated pipe and the inner surface of the connection port of the pipe joint are compressed. The water stop device of the corrugated pipe connecting portion according to claim 1, wherein it protrudes outward by a surplus.   The side surface facing the side wall of the ridge portion of the corrugated tube is formed as an inclined surface that matches the inclination angle of the side wall of the ridge portion. Water stop for corrugated pipe connections. And wherein the pre-Symbol each core material to abutting surface abutting in mutually circumferential direction of the end surface, the water-swellable sheet pressure-contact with each other in the fitting state between the convex portion of the wave with tube is further provided The water stop of the corrugated pipe connection part according to any one of claims 1 to 3. An end portion of a corrugated pipe in which ridges parallel to each other along the circumferential direction are formed on the outer surface, a cylindrical connection port of a pipe joint into which the end of the corrugated pipe is inserted and connected, and the connection A water stop structure of a corrugated pipe connecting portion comprising a water stop device that stops the gap between the end of the corrugated pipe inserted into the mouth and the connection port in the entire circumferential direction,
The water stop device is formed of a split body made of a hard material, and includes a core material that is fitted along the circumferential direction between the ridges of the corrugated tube, and a water-swellable sheet that absorbs water,
The water-swellable sheet is provided at a location facing at least the outer surface between adjacent ridges of the corrugated tube and the inner surface of the connection port of the pipe joint on the outer surface of the core material,
The core material includes the water-swellable sheet in a state in which an end portion of the corrugated pipe is inserted into a connection port of the pipe joint, and the outer surface between the ridges of the corrugated pipe, and the pipe A water stop structure for a corrugated pipe connecting portion characterized by having a rigidity to be pinched by the inner surface of a joint connection port. An end portion of a corrugated tube in which ridges parallel to each other along the circumferential direction are formed on the outer surface;
A tubular connection port of a pipe joint into which the end of the corrugated pipe is inserted and connected;
The water stopping device according to any one of claims 1 to 4, wherein water is stopped over the entire circumferential direction of a gap between the end portion of the corrugated pipe inserted into the connection port and the connection port. A water stop structure of a corrugated pipe connecting portion characterized by comprising.

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