JP2008101671A - Water-tight pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-tight pipe joint for a spiral pipe equipped with a water stop function that can be used even in regions that are different in salinity concentrations regardless of a marine water infiltrated zone or a sweet water spring zone. <P>SOLUTION: An inner surface 15a in a spiral wave shape is formed at least near one side opening end 13a of a pipe joint body 11, a water-tight sheet 16 having water absorption swell characteristics is fixed on the inner surface 15a, and the water-tight sheet 16 absorbs water and is expanded in a state that a spiral wave shaped pipe P is screw-fitted along the inner surface 15a, and thereby, the pipe joint body 11 and the spiral wave shaped pipe P are water-tightly connected. Pressure relaxing members 11a, 26 and 36 for preventing pressure breaking the spiral wave shaped pipe P from being applied when the water-tight sheet absorbs water and is expanded are provided on the pipe joint body 11 portion covering the vicinity of a position to which the water-tight sheet 16 is fixed or the inner surface 15a portion of the pipe joint body 11 abutted on the water-tight sheet 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint for a helical corrugated pipe, and more particularly to a water-tight pipe joint having a watertight sealing function.

  In a pipe joint for a spiral corrugated pipe, a water-swellable water-tight sheet is interposed between the outer surface of the spiral corrugated pipe to be connected and the inner surface of the joint, Alternatively, a technique for self-expanding by absorbing moisture that passes through the pipe and sealing the connection portion between the pipe body and the joint by this expansion action is already known.

  For example, as illustrated in FIG. 5, in order to use a water-swellable and water-tight sheet as a single thickness or a uniform thickness, water tightness is provided on the entire peripheral surface from one opening to the other opening of the joint 1. The sheet 2 is attached and sealed uniformly (see Patent Document 1). In this joint, a uniform clearance is formed between the outer periphery of the tubular body and the water stop layer (watertight sheet).

In addition, it is very easy to connect pipes by using a pipe joint that is a rubber pipe joint that is integrally formed with an expansion body that absorbs moisture and expands on the surface of the connection portion facing the pipe body. It is disclosed that it can do (refer patent document 2).
JP 2004-332895 A JP 2002-333086 A

  From various experimental results and actual use results, the present inventors have found that this type of water-swellable and water-tight sheet greatly varies in water absorption expansion coefficient depending on the type of water to be absorbed. When it divides roughly, it came to confirm that there exists a big difference in a water absorption expansion coefficient between fresh water and seawater, and that swelling property is large in fresh water and small swelling property in seawater. Furthermore, it was confirmed that the swellability changed depending on the salinity concentration.

  Therefore, in order to keep the pipe joint usable in any environmental region regardless of whether it is fresh water or seawater, the water stop performance of the joint is maintained and secured when used in a seawater infiltration region with low swelling. The clearance between the pipe body and the joint must be adjusted to the optimum value in the seawater infiltration area, and should be narrower than the optimum clearance when used in a location where fresh water is present. .

  However, if a pipe joint with a clearance adjusted narrowly in accordance with the use in a seawater infiltration area is used in a location where fresh water is present, the expansion amount of the watertight sheet is far greater than the volume of the clearance space. Or pressure which destroys the spiral corrugated pipe connected to the pipe joint may be applied, and the pipe ends of the pipe joint and the spiral corrugated pipe may crack and cause a water leakage accident.

One solution is to install pipe joints for seawater infiltration areas (narrow clearance) and freshwater spring areas (wide clearance) with different clearances, and use them properly at each location. It is inconvenient for a person to measure the salinity concentration for each use point of a joint and use a joint for fresh water or a joint for seawater while selecting the type of joint. It is unrealistic and not feasible.
Also, in the area near the coast, the seawater infiltration area and the fresh water spring area are not necessarily clearly divided, but are presently mixed, and the salinity concentration varies depending on the location. Is the current situation. Furthermore, fresh water such as rainwater may enter even in seawater infiltration areas.

  Therefore, the present invention provides a pipe laying place in an area near such a coast, where the seawater infiltration area and the fresh water spring area are mixed. It is an object of the present invention to provide a watertight pipe joint having a structure that can be used without concern even if it is used in different zones.

The configuration of the present invention taken to achieve the above object will be described with reference to the reference numerals used in the examples. The watertight pipe joint of the first configuration has at least one side open end (13a) of the pipe joint body (11). ) A spiral corrugated inner surface (15a) is formed in the vicinity, a water-swellable watertight sheet (16) is fixed to the inner surface (15a), and the spiral corrugated pipe (P) is screwed along the inner surface (15a). The watertight sheet (16) is water-tightly connected to the pipe joint body (11) and the spiral corrugated pipe (P) when the watertight sheet (16) absorbs and expands. When the watertight sheet (16) absorbs and expands on the pipe joint body (11a) covering the vicinity of the formed position or the inner surface (15a) of the pipe joint body (11) in contact with the watertight sheet (16) Pipe (P) and pipe fitting body And be provided with a pressure relief member for preventing the pressure to destroy joins (11a) and 11).
Here, as for a pipe joint, the one side opening end of a pipe joint main body may be an inner surface of a spiral waveform, and both opening ends may be an inner surface of a spiral waveform. The former is a pipe joint for connecting different kinds of pipes, and the latter is a homogeneous pipe joint.

  In the watertight pipe joint having the second configuration, a spiral corrugated inner surface (15a) is formed in the vicinity of at least one side open end (13a) of the pipe joint main body (11) made of a rubber material, and the inner surface (15a) has a water-absorbing expansibility. The water-tight sheet (16) having a fixed shape and the water-tight sheet (16) absorbs and expands in a state where the spiral corrugated pipe (P) is screwed along the inner surface (15a). As a rubber material of a watertight pipe joint in which the corrugated pipe (P) is watertightly connected and covering a position where the watertight sheet (16) is fixed in the pipe joint main body (11), JIS K 6253 is used. By using a rubber material having a compliant international rubber hardness of 70IRHD to 98IRHD, the pipe joint body portion (11a) using the rubber material is used as a pressure relaxation member.

Moreover, the watertight pipe joint of the third structure is a watertight sheet in which a spiral corrugated inner surface (15a) is formed in the vicinity of at least one side open end (13a) of the pipe joint main body (11), and the inner surface (15a) has water-absorbing expansibility. (28) is fixed and the watertight sheet (28) absorbs and expands in a state where the spiral corrugated pipe (P) is screwed along the inner surface (15a), so that the pipe joint body (11) and the spiral corrugated pipe (P ) Is watertightly connected to the watertight pipe joint (20), and the pipe joint main body (11) is formed of a rubber material and is on the inner surface (15a) of the pipe joint main body (11) in contact with the watertight sheet (28). In addition, a pressure relaxation layer made of a rubber sheet layer (26) softer than the pipe joint body (11) is provided.

In the watertight pipe joint of the fourth configuration, a spiral corrugated inner surface (15a) is formed in the vicinity of at least one side open end (13a) of the pipe joint body (31) made of a synthetic resin material, and the inner surface (15a) absorbs water and expands. The watertight sheet (16a) having a property is fixed and the watertight sheet (38a) absorbs and expands in a state where the spiral corrugated pipe (P ') is screwed along the inner surface (15a). And the spiral corrugated pipe (P ′) are watertight pipe joints (30), and the synthetic resin of a portion covering the position where the watertight sheet (16) is fixed in the pipe joint body (31) By using a synthetic resin material having a flexural modulus of 200 MPa to 1400 MPa in accordance with JIS K 7171 as the material, the pipe joint body portion (14a) using the synthetic resin material is used as a pressure relaxation member. ing.

Further, the watertight pipe joint of the fifth configuration has a spiral corrugated inner surface (15a) formed in the vicinity of at least one side open end (13a) of the pipe joint main body (31), and a water-absorbing expandable watertight sheet (15a) on the inner surface (15a). 38a) is fixed, and the watertight sheet (38a) absorbs and expands in a state where the spiral corrugated pipe (P) is screwed along the inner surface (15a), whereby the pipe joint main body (31) and the spiral corrugated pipe (P). Is a watertight pipe joint (30) connected in a watertight manner, wherein the pipe joint body (31) is made of a synthetic resin material and is formed on the inner surface (15a) of the pipe joint body (31) in contact with the watertight sheet (38a). A pressure relaxation layer made of an elastomer layer (36a) that is softer than the pipe joint body (31) is provided.

  In the watertight pipe joint of the sixth configuration, the watertight sheet (16, 28, 38a) is made of a water absorbent polymer resin, a water swelling cloth, or a water swelling rubber.

  According to the first configuration of the invention, when the watertight sheet absorbs and expands on the pipe joint body part covering the vicinity of the position where the watertight sheet is fixed, or the inner surface part of the pipe joint body in contact with the watertight sheet, Since the pressure relaxation member for preventing the pressure that destroys the pipe joint body is applied, when the watertight sheet absorbs water and expands, the pressure relaxation member absorbs the change in volume expansion, It prevents excessive pressure from being applied to the spiral corrugated pipe and the pipe joint body. Even when the water absorption expansion coefficient is small like seawater, or even when the water absorption expansion coefficient is large like fresh water, the pressure relaxation member absorbs the change in volume expansion according to the amount of expansion, so Regardless, water tightness can be maintained.

  Further, according to the watertight pipe joint of the second configuration, the international rubber hardness in accordance with JIS K 6253 is 70 IRHD as the rubber material for the part covering the position where the watertight sheet 2 is fixed in the rubber pipe joint body. A rubber material of ~ 98 IRHD is used. Thus, when rubber having a hardness of 70 IRHD to 98 IRHD is used, when the watertight sheet absorbs and expands, the rubber itself swells outward, and even if the volume of the watertight sheet expands, Since the corresponding space is formed, the spiral corrugated pipe and the pipe joint main body are not destroyed by the pressure. In addition, since the rubber material having this hardness does not deform extremely greatly due to the expansion of the watertight sheet, it is possible to suppress a decrease in the pulling strength between the pipe joint and the spiral corrugated pipe. .

  Moreover, according to the watertight pipe joint of the third configuration, a pressure relaxation layer made of a rubber sheet layer softer than the pipe joint body is provided on the inner surface of the pipe joint body in contact with the watertight sheet among the rubber pipe joint bodies. Therefore, when the watertight sheet absorbs and expands, the rubber sheet layer absorbs the expanded volume, so that the spiral corrugated tube is not destroyed by pressure. Further, the rubber sheet layer functions as a packing, and the thickness of the watertight sheet to be used can be reduced.

  Moreover, according to the watertight pipe joint of 4th structure, the bending elastic modulus based on JISK7171 is 200MPa-1400MPa in the synthetic resin material of the part which covers the position where the watertight sheet | seat was fixed among the pipe joint main bodies. Since a certain synthetic resin material is used, when the water-tight sheet absorbs and expands, this portion of the synthetic resin material expands outward, and even if the volume of the water-tight sheet expands, a space corresponding to the expanded portion is formed. Therefore, the spiral corrugated tube is not destroyed by pressure. Moreover, since the synthetic resin material of this hardness does not deform | transform extremely greatly by expansion | swelling of a watertight sheet | seat, it can suppress that it invites the fall of the drawing strength between a pipe joint and a helical corrugated pipe. it can.

  Moreover, according to the watertight pipe joint of the fifth configuration, the pressure relaxation layer made of an elastomer layer softer than the pipe joint body is formed on the inner surface of the pipe joint body in contact with the watertight sheet among the pipe joint bodies made of the synthetic resin material. When the watertight sheet absorbs and expands, the elastomer layer absorbs the expanded portion, so that the spiral corrugated tube is not broken by pressure. Moreover, an elastomer layer will show | play the function as packing, and the thickness of the water-tight sheet to be used can be reduced.

  Further, according to the watertight pipe joint of the sixth structure, the watertight sheet is made of a water-absorbing polymer resin, a water-swelling cloth, or a water-swelling rubber. Absorption into the pipe joint main body, or the rubber sheet layer or the elastomer layer can maintain the water tightness and can prevent the water tight pipe joint and the spiral corrugated pipe from being broken.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and it goes without saying that various aspects are included without departing from the spirit of the present invention.

(Embodiment 1)
FIGS. 1 and 2 are views showing a first embodiment of the present invention, and FIG. 1 is a front view of the upper half of a pipe joint in a state before the pipe body is watertightly connected. FIG. 2 is a cross-sectional view showing the upper half of the pipe joint after water-tight connection. In this embodiment, a pressure relaxation member is provided on the pipe joint itself.

  The pipe joint 10 is a pipe joint used when connecting the spiral corrugated pipe P and the straight pipe Q, and is constituted by a rubber pipe joint body 11 and a fastening band 12. The pipe joint body 11 has two left and right openings 13a and 13b. Among them, the left opening 13b is formed with a cylindrical inner surface 15b having an inner diameter matching the outer diameter of the straight pipe Q at a predetermined width portion 14b from the opening end toward the center. After being inserted along the inner surface 15b, it is fixed by tightening with the tightening band 12 from the outside. The predetermined width portion 14b does not necessarily have to be the entire surface from the opening end to the center of the pipe joint main body, and may be formed in the vicinity of the opening end so that the straight pipe Q can be fixed by the fastening band 12.

On the other hand, on the right opening 13a side, an inner surface 15a having a spiral waveform that matches the outer waveform of the spiral corrugated tube P is formed in a predetermined width portion 14a from the opening end toward the center. The predetermined width portion 14a on which the inner surface 15a having the spiral corrugation is formed does not necessarily have to be the entire surface from the opening end to the center of the pipe joint body, and has a width that allows the spiral corrugated pipe P to be screwed stably. What is necessary is just to form in the opening end vicinity. In order to prevent the spiral corrugated tube P and the straight tube Q from colliding in the vicinity of the center, a projection 17 is formed.
And the watertight sheet | seat 16 which has a water absorptive expansibility adheres along the inner surface 15a which formed the helical waveform. The watertight sheet 16 is made of a water-absorbing polymer resin, a water-swelling cloth, or a water-swelling rubber.

  The pipe joint body 11 is made of rubber as described above, but is made of a material having different rubber hardness between the right side portion to which the spiral corrugated pipe P is connected and the left side portion to which the straight pipe Q is connected. Is used. That is, a rubber material having an international rubber hardness of 70 IRHD to 98 IRHD in accordance with JIS K 6253 is used as the rubber material of the predetermined width portion 14a from the right opening 13a. As shown in FIG. 2, the rubber material having this hardness is formed when a normal resinous spiral corrugated tube P is screwed into the watertight sheet 16 and the watertight sheet 16 is swollen with fresh water or seawater, as shown in FIG. This is the hardness of rubber that allows the water-tight sheet 16 to be pressed against the spiral corrugated tube P with an appropriate biasing force while the material bulges outward and absorbs the volume increase due to the expansion of the water-tight sheet 16. Incidentally, if the rubber material is harder than 98IRHD, excessive pressure may be applied to the spiral corrugated tube P if the swelling degree of the watertight sheet is increased, and if the rubber material is softer than 70IRFD, the watertightness can be maintained. It may disappear. Further, in the case of a rubber material softer than 70IRFD, the pipe joint itself becomes too soft, and the pullout strength in the connected state between the pipe and the pipe joint may not be maintained.

  On the other hand, the rubber material of the predetermined width portion 14b from the left opening 13b can insert the straight pipe Q along the inner surface 15b, and the fastening pipe 12 allows the straight pipe Q and the pipe joint body 11 to be watertight. Anything can be used as long as it can be fixed. Specifically, a rubber material having an international rubber hardness of around 70 IRHD in accordance with JIS K 6253 has a moderate softness when inserting a straight pipe and makes it easy to insert the straight pipe Q. I use it.

In addition, the adjustment of the hardness of the rubber material on the left side 11b (hardness of about 70 IRHD) and the rubber material on the right side 11a (hardness of 70 IRHD to 98 IRHD) of the pipe joint body 11 is made by adding a hard resin component or a reinforcing agent such as carbon black. This is done by a common adjustment technique that makes the amount different on the left and right.
Thus, by forming the pipe joint main body 11, it is possible to obtain the pipe joint 10 in which the watertight sheet 16 is fixed to the right inner surface 15 a of the pipe joint main body 11.

Next, the use operation of the pipe joint 10 will be described. When using the pipe joint 10, the spiral corrugated pipe P to be connected is inserted from the right side opening 13 a and screwed to the back. Further, the straight pipe Q is inserted from the left opening 13 b, pushed into the back, and fixed by the tightening band 12.
In this way, the pipe joint 10 to which the pipe bodies are connected only needs to be installed at the laying place. Even if the laying place of the pipe joint 10 is a place where fresh water is present or a place where seawater is present, if the fresh water or seawater soaks between the spiral corrugated pipe P and the watertight sheet 16 of the joint body 11, the watertight sheet 16 is formed. Swells and expands in volume. When the water is fresh water, the swelling degree of the watertight sheet 16 is large and the volume expansion degree is large. Therefore, the right side 11a of the pipe joint main body 11 has a water stop action without crushing the spiral corrugated pipe P due to large swelling. Play. Further, when the water is seawater, the degree of swelling of the watertight sheet is small, so that the right side 11a of the pipe joint body 11 swells smaller than in the case of fresh water, so that the water blocking action is achieved without crushing the spiral corrugated pipe P. Play. That is, although the degree of swelling varies depending on the salinity of water, the right side 11a of the pipe joint body 11 swells in accordance with the volume expansion degree, thereby preventing excessive pressure from being applied to the spiral corrugated pipe P and water tightness. It becomes possible to have sex together.

  The pipe joint 10 according to the present embodiment connects the spiral corrugated pipe P and the straight pipe Q, but instead of the straight pipe Q, a spiral corrugated pipe P ′ may be connected. In this case, a rubber material having an international rubber hardness of 70 IRHD to 98 IRHD conforming to JIS K 6253 is also used on the left side 11 b of the pipe joint body 11.

(Embodiment 2)
FIG. 3 is a front view showing the upper half of the pipe joint according to the second embodiment of the present invention in a longitudinal section. Components similar to those in FIGS. 1 and 2 are denoted by the same reference numerals, and a part of the description is omitted. In this embodiment, the pressure relief member (pressure relief member) is provided between the pipe joint and the watertight sheet, instead of providing the pressure relief member on the pipe joint itself.

  The pipe joint 20 of this embodiment is also a pipe joint used when connecting the spiral corrugated pipe P and the straight pipe Q, and is constituted by a rubber pipe joint body 21 and a fastening band 12. The pipe joint body 21 has two left and right openings 13a and 13b. Among them, the left opening 13b is formed with a cylindrical inner surface 15b having an inner diameter matching the outer diameter of the straight pipe Q at a predetermined width portion 14b from the opening end toward the center. After being inserted along the inner surface 15b, it is fixed by tightening with the tightening band 12 from the outside.

On the other hand, on the right opening 13a side, an inner surface 15a having a spiral waveform that matches the outer waveform of the spiral corrugated tube P is formed in a predetermined width portion 14a from the opening end toward the center.
The rubber sheet layer 26 and the watertight sheet 28 are laminated along the inner surface 15a forming the spiral waveform.
For the water-tight sheet layer 28, a water-absorbing polymer resin, a water-swelling cloth, or a water-swelling rubber is used. Of these, the water-swelling fabric has the property of instantly swelling when it absorbs moisture, and the water-swelling rubber has the property of slow response to swelling. Use. For example, when construction is performed in rainy weather, it is convenient to use water-swelling rubber having a slow response.

  The rubber sheet layer 26 is made of a rubber material whose hardness is softer than both the pipe joint main body 21 and the watertight sheet 28. Thereby, when the watertight sheet 28 swells, the volume change of the watertight sheet 28 can be absorbed, and an appropriate urging force can be applied, thereby ensuring watertightness.

(Embodiment 3)
FIG. 4 is a front view showing a part of the upper half portion of the pipe joint according to the third embodiment of the present invention. About the thing similar to FIGS. 1-3, the same code | symbol is attached | subjected and some description is abbreviate | omitted. In this embodiment, a resin pipe joint is used, and a pressure relaxation layer (pressure relaxation member) is provided between the pipe joint and the watertight sheet.

The pipe joint 30 of this embodiment is a pipe joint used when connecting two spiral corrugated pipes P ′ and P ′, and is constituted by a pipe joint body 31 made of synthetic resin. In this pipe joint 30, what has a thickness comparable as the thickness of the pipe to connect is used. The pipe joint main body 31 has two left and right openings 13a and 13b. In the predetermined width portions 14a and 14b in the vicinity of the opening ends on both sides, spiral wave-shaped inner surfaces 15a and 15b having an inner diameter matching the outer diameter of the spiral corrugated pipes P and P 'to be connected are formed.
The elastomer layers 36a and 36b having rubber elasticity are formed along the inner surfaces 15a and 15b forming the spiral waveform, and the watertight sheet layers 38a and 38b are formed in a part near the opening end. .
A water-swelling cloth or a water-swelling rubber is used for the water-tight sheet layers 38a and 38b. In this embodiment, a water-swelling cloth that expands instantaneously is used. The water-tight sheet layers 38a and 38b are provided only in the vicinity of the opening end, and the elastomer layers 36a and 36b are exposed at the part deeper than this.

The elastomer layers 36 a and 36 b are made of a material whose hardness is softer than both the pipe joint body 31 and the watertight sheet layer 38. As a result, when the water-tight sheet 38 layer swells, the volume change of the water-tight sheet can be absorbed, and an appropriate urging force can be applied to ensure water-tightness. In this embodiment, since it may be difficult to absorb the volume expansion when the watertight sheet layer 38 swells only with the elastomer layer, the watertight sheet layer 38 made of a water-swelled cloth is formed only in the vicinity of the opening end. However, a space layer can be formed on the back side.
Thereby, when volume expansion becomes excessive, it can be spread toward the space layer on the back side.

  Furthermore, the pipe joint main body portions 14a and 14b covering the portions where the water-tight sheet layers 38a and 38b are formed use a synthetic resin material having a flexural modulus of 200 MPa to 1400 MPa in accordance with JIS K 7171. When the sheet layer absorbs and expands, the sheet layer swells outward. Thereby, absorption of volume expansion is absorbed not only by the elastomer layers 36a and 36b but also by the pipe joint body. Specifically, the range of the flexural modulus is a degree of flexural modulus from high density polyethylene (HDPE) to low density polyethylene (LDPE).

  In this embodiment, both the absorption of the expansion due to the formation of the elastomer layer and the absorption of the expansion due to the swelling of the pipe joint body by setting the material of the synthetic resin material to a predetermined bending elastic modulus. Have taken. Even with only one of the measures, destruction can be prevented.

  For example, as shown in FIG. 5, directly on the inner surfaces 15a and 15b of a pipe joint body 31 (for example, a pipe joint body made of high-density polyethylene) of a synthetic resin material having a flexural modulus of 200 MPa to 1400 MPa in accordance with JIS K 7171, The watertight sheet layers 38 a and 38 b may be formed to prevent breakage by absorbing the expansion due to the swelling of the pipe joint body 31.

(Embodiment 4)
FIG. 6 is a front view showing a part of the upper half of the pipe joint according to the fourth embodiment of the present invention in a longitudinal section. Parts similar to those in FIGS. 1 to 5 are denoted by the same reference numerals, and a part of the description is omitted. This embodiment is a modified example of the first embodiment, and uses a spiral corrugated rubber pipe joint.

That is, the pipe joint 50 of the present embodiment is a pipe joint used when connecting two spiral corrugated pipes P ′ and P ′, and rubber having an international rubber hardness in accordance with JIS K 6253 of 70IRHD to 98IRHD. It is comprised by the pipe joint main body 51 which used the material for the whole pipe joint. The pipe joint main body 51 has two left and right openings 13a and 13b. In the predetermined width portions 14a and 14b in the vicinity of the opening ends on both sides, spiral wave-shaped inner surfaces 15a and 15b having an inner diameter matching the outer diameter of the spiral corrugated tubes P ′ and P ′ to be connected are formed.
And the watertight sheets 38a and 38b which have a water absorptive expansibility are adhering along the inner surfaces 15a and 15b which formed the helical waveform. A water-swelling cloth or a water-swelling rubber is used for the water-tight sheet layers 38a and 38b. In this embodiment, a water-swelling cloth that expands instantaneously is used. The water-tight sheet layers 38a and 38b are provided only in the vicinity of the opening end, and the inner surfaces 15a and 15b are exposed at the part deeper than this.
With such a configuration, when the watertight sheet layers 38a and 38b swell, the pipe joint 50 absorbs the volume change of the watertight sheets 38a and 38b due to the deformation of the pipe joint main body 51 and gives an appropriate urging force. And water tightness is secured. According to the present embodiment, since the shape of the pipe joint has a spiral waveform, the amount of rubber material used can be reduced compared to that of the first embodiment, and yet a watertight structure equivalent to that of the first embodiment is obtained. be able to.

  The present invention can be applied not only to a joint for connecting spiral tubes but also to a pipe joint for connecting pipes of different shapes, such as a case where one is a spiral tube and the other is a straight tube or a tapered tube. .

  As described above, the watertight pipe joint according to the present invention can be used regardless of the water quality without giving weight to the water quality at the place where the pipe is laid. It seems to be used greatly in

The upper half longitudinal section front view showing the joint of a 1st embodiment. The front view which shows the state which inserted the pipe body in the coupling of FIG. The upper half longitudinal section front view showing the joint of the 2nd example. The upper half longitudinal section front view showing the joint of the 3rd example. The upper half longitudinal section showing the modification of the 3rd example. The upper half longitudinal section front view showing the joint of the 4th example. The upper half longitudinal section front view showing the conventional joint.

Explanation of symbols

10, 20, 30, 40, 50 Pipe joint 11, 21, 31, 41, 51 Pipe joint body 12 Tightening band 13 Open end 14 Area where water-tight sheet is formed 15 Inner surface 16 Water-tight sheet (water-absorbing resin polymer)
17 Protrusion 26 Rubber sheet layer 28 Watertight sheet (water swelling rubber)
36 Elastomer layer 38 Watertight sheet (water swelling cloth)
P, P 'spiral corrugated pipe Q straight pipe

Claims (6)

A spiral corrugated inner surface (15a) is formed in the vicinity of at least one side open end (13a) of the pipe joint body (11), and a water-absorbing and water-tight sheet (16) is fixed to the inner surface (15a). A watertight pipe joint (11) and a spiral corrugated pipe (P) are connected in a watertight manner by the watertight sheet (16) absorbing and expanding in a state where the spiral corrugated pipe (P) is screwed along ( 10)
The watertight sheet (16) is provided on the pipe joint body (11a) covering the vicinity of the position where the watertight sheet (16) is fixed, or on the inner surface (15a) of the pipe joint body (11) in contact with the watertight sheet (16). A watertight pipe joint provided with a pressure relaxation member (11a) for preventing a pressure that destroys the helical corrugated pipe (P) and the pipe joint body (11) from being applied when absorbing water. A spiral corrugated inner surface (15a) is formed in the vicinity of at least one side open end (13a) of the pipe joint body (11) made of a rubber material, and a watertight sheet (16) having water absorbability and expandability is fixed to the inner surface (15a), The watertight sheet (16) absorbs and expands in a state where the spiral corrugated pipe (P) is screwed along the inner surface (15a), so that the pipe joint body (11) and the spiral corrugated pipe (P) are watertightly connected. A watertight pipe joint (10),
By using a rubber material having an international rubber hardness of 70 IRHD to 98 IRHD in accordance with JIS K 6253 as the rubber material of the portion covering the position where the watertight sheet (16) is fixed in the pipe joint body (11), A watertight pipe joint using the pipe joint body portion (11a) using the rubber material as a pressure relaxation member. A spiral corrugated inner surface (15a) is formed in the vicinity of at least one side open end (13a) of the pipe joint main body (11), and a watertight sheet (28) having water-absorbing expansibility is fixed to the inner surface (15a). A watertight pipe joint in which the pipe joint main body (11) and the spiral corrugated pipe (P) are watertightly connected by the watertight sheet (28) absorbing and expanding in a state where the spiral corrugated pipe (P) is screwed along (20)
The pipe joint main body (11) is formed of a rubber material, and includes a rubber sheet layer (26) softer than the pipe joint main body (11) on the inner surface (15a) of the pipe joint main body (11) in contact with the watertight sheet (28). A watertight pipe joint provided with a pressure relaxation layer. A spiral corrugated inner surface (15a) is formed in the vicinity of at least one side open end (13a) of the pipe joint body (31) made of a synthetic resin material, and a water-tight sheet (16) having water-absorbing expansibility is fixed to the inner surface (15a). The water-tight sheet (38a) absorbs and expands in a state where the spiral corrugated pipe (P ') is screwed along the inner surface (15a), so that the pipe joint body (31) and the spiral corrugated pipe (P') are water-tight. A watertight pipe joint (30) connected to
By using a synthetic resin material having a bending elastic modulus in accordance with JIS K 7171 of 200 MPa to 1400 MPa as a synthetic resin material covering a position where the watertight sheet (16) is fixed in the pipe joint body (31). A watertight pipe joint using the pipe joint body portion (14a) using the synthetic resin material as a pressure relaxation member. A spiral corrugated inner surface (15a) is formed in the vicinity of at least one side opening end (13a) of the pipe joint body (31), and a water-absorbing and water-tight sheet (38a) is fixed to the inner surface (15a). A watertight pipe joint (31) and the spiral corrugated pipe (P) are connected in a watertight manner by the watertight sheet (38a) absorbing and expanding in a state where the spiral corrugated pipe (P) is screwed along ( 30),
The pipe joint body (31) is made of a synthetic resin material, and has a pressure composed of an elastomer layer (36a) softer than the pipe joint body (31) on the inner surface (15a) of the pipe joint body (31) in contact with the watertight sheet (38a). A watertight pipe joint characterized by providing a relaxation layer.   The watertight pipe joint according to any one of claims 1 to 5, wherein the watertight sheet (16, 28, 38a) is made of a water-absorbing polymer resin, a water swelling cloth, or a water swelling rubber.

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