EA013259B1 - Pipe joint - Google Patents

Abstract

The invention task is to provide a pipe joint in which the pipe body and a pipe can be simply and easily connected and a reliable flashing can be achieved by quick expansion of a part which is quickly water expanded. A pipe connection 1 has a water expansion part 4 expanding on the surface facing the pipe body. A nonwoven water expansive fabric comprising main material 9 made of resin, a nonwoven water expansive fabric 10 and having high melting point and binding material 11 used for forming water expansion part 4 by combining main material 9 and the nonwoven water expansive fabric 10 by melted binding material. Besides, approximately homogenous seal is formed between the outer circular surface of pipes bodies 2, 2 and the water expansion part 4, when the pipes bodies 2, 2 are connected by main part 1a for pipe connection 1. Additionally, both end parts 23a, 23a of a nonwoven sheet 23 twisted almost cylindrically are overlapped, and, thus forming the nonwoven sheet entirely adhered on the inner circular surface of main connection part forming pipe connection 1.

Description

The present invention relates to a pipe connection for connecting pipe bodies with each other to protect a power cable or a coherent cable, for example, buried underground.

The level of technology

Usually, since the pipe connection for connecting the pipe body or pipe bodies with each other to protect the electrical wire or cable is buried underground, a reliable and sufficiently waterproof construction or waterproofing structure is required, in particular between the pipe body and the pipe connection.

Traditionally, in response to these demands, various types of pipe connections have already been invented. More specifically, there is a pipe connection to a waterproof sealing sheet, in which the pipe connection has a central pipe in its central part, a short pipe part attached so that it rotates freely at the respective ends of the central pipe, and the waterproof sheet is sealed onto the inside circular front surfaces of both parts of the short pipe. However, since the fabric sheet for waterproof sealing is formed by applying and holding resin material such as granular powder, swelling under the action of water, on the outer circular outer surface of the material, the resin material mentioned above, swelling under the action of water, may be able to crumble under the action of external force. Thus, the resin material, swelling under the action of water, is easily peeled off from the surface of the fabric sheet, intended for waterproof sealing. When the resin material is peeling off before joining, it adversely affects the waterproofing function.

Patent document 1: Japanese publication of the utility model He1 7 (1995) -52467.

Summary of Invention

The objective of the invention is to provide a pipe connection in which the pipe body and pipe connection can be simply and easily connected and the reliable function of waterproofing can be obtained by rapidly swelling in the water the part swelling under the action of water.

The first embodiment of the pipe connection according to the invention is a pipe connection comprising the main part of the connection for connecting the end parts of the pipe bodies, in which the main material made of resin used as the base material, the material swelling under the action of water into which the material is embedded resin, swelling under the action of water and having a high melting point, and a binder material used for the manufacture of nonwoven material, the main material and material, swelling under the action of water, are combined with a binder, molten heat released during manufacture, to form a part swelling under the action of water, and a part swelling under the action of water is formed completely on the surface of the main part of the connection facing the pipe body.

The pipe connection according to the invention is also a pipe connection containing the main part of the connection for connecting the end parts of the pipe bodies, in which the base material made of resin as the base material and the material swelling under the action of water, into which the resin material is embedded, swelling under the action of water and having a low melting point, are used for the manufacture of nonwoven material created from a material swelling under the action of water, softened by heat, emitting Xia during manufacture, fully integrated with the base material to form the part to swell by water and a portion swells by water, entirely formed on the surface of the base part of the connection facing towards the tube body.

In one of the embodiments of the invention, the gap for the passage of water is formed between the part, swelling under the action of water, and the body of the pipe during drying before swelling under the action of water and after swelling under the action of water.

The second embodiment of the pipe connection in accordance with the invention is a pipe connection A comprising a main part of a connection for connecting end parts of pipe bodies having a concave-convex spiral configuration in which a part swelling under the action of water is provided on the inner surface of the main part of the connection a uniform gap is formed by the outer circular surface of the pipe body and the part that swells under the action of water, when the pipe bodies are connected to the main part w compound.

The third embodiment of the pipe connection in accordance with the invention is a pipe connection for connecting the end parts of the pipe bodies by screwing them to a waterproofing state in which both end parts of the part that swells under the action of water formed on the inner surface of the main part of the connector facing the outer the circular surface of the pipe body overlap. Additionally, both end parts of the part that swells under the action of water formed on the inner surface of the main body of the connection facing the outer circular surface of the pipe body overlap, and both end parts of the part which expand under the action of water overlap by the overlap width, in which they only

- 1 013259 The jacket is approximately uniform in the circular direction.

The fourth embodiment of the pipe connection according to the invention is a pipe connection having a spiral continuous groove formed on its inner surface, comprising a sheet member superimposed on the inner circular surface of the pipe connection; and a stopper protruding from the inner surface of the pipe connection, in which the stopper is installed at least in one place along the axial direction of the pipe connection, and the ratio of the distance between one end of the pipe connection and the nearest stopper from it to the distance between the other end of the pipe connection and its nearest the stopper is set to 1 to 2.

In this regard, the sheet element superimposed on the inner surface of the pipe connection has the same configuration and function as the part swelling under the action of water formed on the inner surface of the main part of the connection for the pipe connection.

In accordance with the fourth embodiment, since the stopper is installed on the inner surface of the pipe connection and the position of the stopper is set in such a way that the ratio of the distance between one end of the pipe connection and the stopper to the distance between the other end of the pipe connection and the stopper is approximately 1 to 2, part in wherein the pipe body and the pipe connection overlap are substantially identical.

Additionally, since the pipe body is screwed in until the pipe body comes into contact with the stopper, the connection operation is simple and reliable, and, in addition, since there is no need to visually confirm the length to which the screwing should be performed, the connection operation is reliably performed even in a dark place.

Additionally, since the length of the sheet member, such as a sheet, swelling under the action of water, is shorter than the distance from the end of the pipe connection to the stopper, and the sheet element does not exist near the end part of the pipe body in the state in which the pipe body is attached to the pipe connection, deformation Pipe casing can be prevented.

Here, when the length of the sheet member is less than the distance from the end of the pipe connection to the stopper, it is possible to use the connection even if the sheet elements differ in length from the end of the pipe connection to the stopper on the corresponding long side and short side.

In addition, it is desirable that the length of the sheet element superimposed on both sides of the pipe connection is shorter than the length of the distance on the shorter side from the end of the pipe connection to the stopper, since the cost of the material of the sheet element decreases and the resistance of the pipe connection when screwing is less. In order to have the same waterproofing function on both sides of the pipe joint, the length of the sheet member on both sides is preferably set to be identical.

The result of the invention

The first embodiment of the invention has the result that the material swelling under the action of water, or the resin that absorbs the liquid, almost does not spill out of the nonwoven base material and that the tubular connection, which is used once through the absorption of water for swelling, can be reused again.

In the second embodiment of the invention, since between the outer circular surface and the part swelling under the action of water, when the pipe bodies are connected using the main part of the connection, a uniform gap is formed, the connection and detachment of the main part of the connection becomes simple, which improves the ease and simplicity of the connection with the main part of the connection. Even if the pipe body has the ability to bend, it is possible to provide a pipe connection in which the connection of the pipe body and pipe connection is simple, and the waterproofing for seeping water and moisture is maintained by a gap, thus obtaining a reliable waterproofing function due to the rapid absorption of water for swelling part , swelling under the action of water, after absorption of water.

In the third embodiment of the invention, since both end parts of the part that swells under the action of water overlap in such a way that both end parts are formed approximately uniform in thickness, or that both end parts are formed approximately uniform in thickness in the circumferential direction with formation on the inside the circular surface of the pipe joint, the part swelling under the action of water, in general, can be formed so as to be approximately uniform in thickness.

Since the water swelling part swells approximately evenly when water is absorbed, a gap or passage of water (water leakage) is not created in the overlapping part for the part swelling under the action of water, and thus water ingress and penetration can definitely be prevented. Since the part swelling under the action of water, in general, is formed so as to be approximately uniform in thickness, such a large contact resistance that can damage the connection of the pipe body and the pipe connection, as a rule, does not apply and, thus, the contact resistance of parts facing each other is small. Therefore, the operation of screwing the end parts of the pipe body into the pipe connection and the operation you

- 2 013259 screwing of the end parts of the pipe body from the pipe connection can be performed simply and easily, thus improving the usability.

In accordance with the fourth embodiment of the invention, the corresponding overlapping parts of the pipe body and pipe connection are approximately identical at the time of connecting the pipe bodies, thus allowing the pipe connection to be provided without deforming the end part of the pipe body.

Brief Description of the Drawings

FIG. 1 is a perspective view of a first embodiment of a pipe connection;

FIG. 2 is a perspective view of a pipe body and pipe connection;

FIG. 3 is a sectional view of pipe shells connected by a pipe connection;

FIG. 4 is a sectional view showing the condition of the waterproofing;

FIG. 5 (a) is a view showing a compound using a binder material;

FIG. 5 (b) is a view showing the state in which the material is swollen under the action of water;

FIG. 6 (a) is a view showing a material from a base material and a material swelled by the action of water;

FIG. 6 (b) is a view showing the state of the compound by softening;

FIG. 6 (c) is a view showing the state in which the material is swollen under the action of water;

FIG. 7 is a perspective view of a second embodiment of the pipe connection and the pipe body;

FIG. 8 is a sectional view for showing the state of pipe bodies connected by a pipe connection;

FIG. 9 is a sectional view of the waterproofing state;

FIG. 10 is a sectional view of a state in which the abutting part of the pipe body is inclined to one side;

FIG. 11 is a sectional view of the waterproofing construction condition shown in FIG. ten;

FIG. 12 is a sectional view of another example of pipe connection;

FIG. 13 is a sectional view of the waterproofing structure shown in FIG. 12;

FIG. 14 is a sectional view of an additional another example of pipe connection;

FIG. 15 is a sectional view of the state of the waterproofing structure shown in FIG. 14;

FIG. 16 is a partial enlarged sectional view of a further another example of a pipe connection;

FIG. 17 is a partial enlarged cross-sectional view of an additional another example of pipe connection;

FIG. 18 is a perspective view of a method for joining pipe bodies using a pipe connection in accordance with a third embodiment;

FIG. 19 is a perspective view of a tubular connection with a part swelling under the action of water, fully formed on its inner surface;

FIG. 20 is a perspective view of the winding of the part swelling under the action of water to an approximately cylindrical shape;

FIG. 21 is a perspective view of the stage of complete formation of the part swelling under the action of water on the inner surface of the pipe joint;

FIG. 22 is a sectional view of a state in which a part swelling under the action of water is completely formed on the inner surface of the pipe joint;

FIG. 23 is a perspective view of a state in which both end portions of the part that swells under the action of water completely overlap;

FIG. 24 is a sectional view of a formed pipe joint, in which the part swelling under the action of water is entirely formed on the internal circular surface of the pipe joint;

FIG. 25 (a) is a perspective view of a pipe connection 31;

FIG. 25 (b) is a sectional view of a pipe connection 31;

FIG. 26 is a view of a method for connecting pipe housings 41a, 41b using pipe connection 31;

FIG. 27 is a partial enlarged view of part C shown in FIG. 26 (c), representing the ratio of internal diameters between the stopper 37 and the pipe body 41b;

FIG. 28 - half pipe 43;

FIG. 28 (a) is a perspective view of a half pipe 43;

FIG. 28 (b) —bottom view of half of pipe 43;

FIG. 28 (c) is a view showing a state in which a pair of tube halves 43a, 43b is located in front of each other and is connected;

FIG. 29 illustrates a method for manufacturing a half pipe 43 and FIG. 30 is a sectional view of the pipe connection 70.

Explanation of reference numbers

- pipe connection;

- 3 013259

1a - the main part of the compound;

1b - spiral concave-convex configuration;

1L is the convex part;

1b - concave part;

- acting part;

- pipe body;

2a - spiral concave-convex configuration;

2AA - protruding part;

2aB - recessed part;

- part swelling under the action of water;

- main material;

10, 12 - material, swelling under the action of water;

- bonding material;

- non-woven material, swelling under the action of water;

- non-swelling non-woven material;

- non-woven sheet;

23a — end portion;

23b — layered part (overlapping parts);

- needlepunch stamp;

- molding machine;

- internal form;

27a — part of the groove;

- external form;

28a — projecting part;

- top form;

And - overlap width;

C - clearance;

31, 70 - pipe connection;

a, 33b - part of the liner;

- sheet, swelling under the action of water;

- stopper;

- internal groove;

41a, 41b - pipe body;

- half of the pipe;

- connection surface;

- fixed form;

- mobile form;

- injection part;

- sprue;

- curved part.

The best mode (s) of carrying out the invention

One of the embodiments of the present invention is described with reference to the drawings.

FIG. 1 and 2 show pipe connection 1 for the first embodiment. Pipe connection 1 contains the main part 1a of the pipe connection, made of synthetic resin or synthetic rubber and having a continuous concave-convex spiral configuration 1b, and part 4 of the type of layer or sheet, swelling under the action of water, fully formed on the entire inner surface of the main part 1a of pipe connections. Pipe connection 1 connects one pipe body 2 (i.e., pipe) having a corresponding concave-convex spiral configuration 2a with another pipe body 2 (i.e. with a pipe) having a corresponding concave-convex spiral configuration 2a.

More specifically, the pipe connection 1 is screwed into one pipe body 2 until one end portion 1A of the pipe connection 1 coincides with the end part 2 A of one pipe body 2. Then, the end part 2A of one body 2 of the pipe coincides or essentially coincides with the end part 2 A of the other body 2 of the pipe. Then, the pipe connection 1, when screwed into the body of one pipe, is screwed back half the screw-in length. Thus, the other end part of the pipe connection 1 is screwed into the other body 2 of the pipe. As shown in FIG. 3, the pipe connection connects two bodies 2, 2 pipes.

As shown in FIG. 3, a clearance C (i.e., a water path) for flowing water (incoming water) is formed between part 4, swelling under the action of water, fully formed on the inner surface of the main part 1a of the pipe connection 1, and the outer surfaces of the two bodies 2 , 2 tubes, which are formed before the part that swells under the action of water, absorbs water to become swollen, and during drying (drying water) after swelling

- 4 013259 under the action of water.

Cases 2, 2 pipes and pipe connection 1 are buried under the ground in a state in which electric wire and / or cable are laid inside cases 2, 2 pipes. When part 4, which swells under the action of water, absorbs water, as shown in FIG. 3, 4, part 4, swelling under the action of water, in particular, both end parts of the pipe connection, swell. In accordance with the absorption of water and expansion part 4, swelling under the action of water, waterproofs the interface between the inner surface of the main part 1a of the joint and the outer surface of the pipe body 2, thus creating a reliable waterproofing.

FIG. 5 is an enlarged view of the detailed structure of part 4, swelling under the action of water. First, approximately 30 to 50% by weight of the base material 9, as the base material of a nonwoven material made of resin, such as polyethylene terephthalate (PET), approximately 50 to 70% by weight of material 10 swelling under the action of water, in which the material high melting point resins that swell under the action of water turn into a material (i.e., when water is absorbed, the material must swell, and when the surrounding humidity becomes low, the material releases water), and approximately 2 to 15% by weight of the binder material such a PET with a low melting point (more specifically, a polymer binder material) are used and, essentially, evenly mixed for the manufacture of nonwoven material (the step of forming a nonwoven material).

As described above, the material 10 is used, which swells under the action of water, FIRED OA818, which has a softening point of approximately 170 ° C using polymer with direct fiber formation, having sodium polyacrylate as the main component and material for material preparation). As a binder material 11, a binder material with a low melting point, having a softening point of approximately 120 ° C, is used.

Then, a flat non-woven material is formed into a cylindrical shape and the formed material in the shape of a cylinder is arranged according to an internal shape (more specifically, the internal shape has a multiply divided structure and its surface causes a spiral concave convex shape to be formed). Then, the outer shape with a structure consisting of two halves (more specifically, the outer shape has a surface that causes a spiral concave shape to form) is placed on the outer side of the nonwoven fabric described above. The molten synthetic resin or synthetic rubber is poured into the interface between the inner surface of the outer shape and the outer surface of the nonwoven material to form the main part 1a of the joint, and then the outer shape is fixed. Next, heat treatment is carried out at a temperature of from about 150 to 180 ° C under pressure.

Heat causes the binder material 11 to melt and the molten binder material 11 firmly joins the base material 9 and the material 10, which swells under the action of water, to form part 4, which swells under the action of water (the connection step with a binder), as shown in FIG. 5 (a). Since the part 4, which swells under the action of water, is formed together with the main body 1a of the joint (the joint formation step), the part which swells under the action of water, after removing the mold, becomes part of the pipe connection 1, as shown in FIG. one.

The material 10, swelling under the action of water, in the part 4 described above, which swells under the action of water, expands in the direction of the diameter when water is absorbed in order to assume the condition shown in FIG. 5 (b) for waterproofing. At this moment, since the material 10, swelling under the action of water, is firmly combined with the base material 9 by the bonding material 11, the material 10, which swells under the action of water, rarely separates.

The example pipe connection shown in FIG. 1-5, contains the main part 1A of the connection for connecting the end parts of the housings 2, 2 pipes. The base material 9 made of resin as the base material, the material 10, swelling under the action of water, made of the resin material swelling under the action of water, and the binder material are used to make the nonwoven material. Part 4, swelling under the action of water, goes through a process of formation, in which the binder melted by the heat released during manufacture must combine the base material 9 with the material 10 swelling under the action of water. The above-described part 4, which swells under the action of water, is completely formed on the surface of the main part 1a of the joint located opposite the pipe bodies 2, 2 (the inner surface in this example).

In accordance with the features described above, since the base material 9 and the material 10, swelling under the action of water, are joined with a binder material, molten heat, released during the manufacture of part 4, which swells under the action of water, in addition to the mutual adhesion of materials 9, 10, material 10 , swelling under the action of water, is rarely separated from the base material of the nonwoven material to absorb water. Additionally, even after the material swelling under the action of water absorbs water and becomes swollen under the action of water, the material 10 swelling under the action of water rarely separates from the base material of the nonwoven material.

- 5 013259

Since the material 10, which swells under the action of water, is compressed to the original volume during drying, the pipe connection 1 can be used again after it has been used. Additionally, since the material 10, swelling under the action of water, is evenly placed in part 4, which swells under the action of water, a corresponding waterproofing effect can be obtained.

In addition, during the stay in the dried state before swelling under the action of water, and after swelling under the action of water, a gap C for the passage of water is formed between part 4, which swells under the action of water, and the body 2 of the pipe. In accordance with the aforementioned feature, the operation of fixing and unlocking the pipe connection 1 can be performed very smoothly and easily, since the above-described clearance C is formed between part 4, which swells under the action of water, and the body 2 of the pipe during drying before and after swelling under the action of water . More specifically, the contact resistance of the water-swellable part 4 with the pipe body 2 is not enough at any time to fix and unlock the pipe connection 1, and thus the separation of material swelling under the action of water due to external mechanical force becomes even more rare. , which improves the reusable pipe connection property 1 (reuse resolution).

In accordance with the above-described gap C, since water easily penetrates into part 4, which swells under the action of water, the part which swells under the action of water expands rapidly to allow for a good waterproofing. Meanwhile, the pipe connection 1 can be removed, overcoming the force that has arisen during the installation of the part swelling under the action of water, even during the absorption of water for swelling under the action of water.

FIG. 6 shows an enlarged view of part 4, swelling under the action of water, from another example. First, the base material 9 as a base material of a nonwoven material made from a resin of type PET, and material 12 swelling under the action of water, in which the resin material swelling under the action of water with a low melting point turns into a material (i.e. when the water is absorbed, the material must swell, and when the surrounding humidity becomes low, the material gives up water), is used and is essentially evenly mixed to make nonwoven material (the step of forming a nonwoven material). As described above, material 12 is used, swelling under the action of water, called 3ΕΆΤ, having a softening point of approximately 120 ° C (BABEL is a registered trademark of a product from TouoBo So. B1b).

Then, a flat non-woven material is formed into a cylindrical form and the formed material in the form of a cylinder is arranged according to the internal form (more specifically, the internal form has a multiply divided structure and its surface causes a spiral concave convex feature of the form to form). Then, the outer shape with the structure divided into two halves (more specifically, the outer shape has a surface that causes a spiral concave-convex shape sign to be formed) is placed on the outer side of the nonwoven material described above. The molten synthetic resin or synthetic rubber is poured into the interface between the inner surface of the outer shape and the outer surface of the nonwoven material to form the main part 1a of the joint, and then the outer shape is fixed. Next, heat treatment is carried out at a temperature of from about 150 to 180 ° C under pressure. Heat causes the material 12 to soften, swelling under the action of water, as shown in FIG. 6 (a) and FIG. 6 (b). At this moment, such a softened material 12, swelling under the action of water, is firmly connected to the base material 9 on a wide area (joining step) to form part 4 swelling under the action of water. Part 4, swelling under the action of water, is formed together with the main body 1a of the joint (stage of joint formation), part 4, which swells under the action of water, after removing the mold, becomes part of the pipe joint 1, as shown in FIG. one.

The material 12, which swells under the action of water, in the part 4 described above, which swells under the action of water, expands in the direction of the diameter when water is absorbed in order to assume the state shown in FIG. 6 (c), for the implementation of waterproofing. More specifically, material 12, swelling under the action of water, moves to the surface that is supposed to waterproof. At this moment, since the material 12, swelling under the action of water, under the action of heat during manufacture, is firmly combined with the base material 9 on a wide area, the material 10, which swells under the action of water, rarely separates.

The example pipe connection shown in FIG. 6, contains the main part 1A of the connection for connecting the end parts of the housing 2, 2 pipes. The base material 9, made of resin as the base material, the material 12, swelling under the action of water, made of a polymeric material, swelling under the action of water, is used to make a nonwoven material (see Fig. 6 (a)). Part 4, swelling under the action of water, goes through a process of formation in which the softened material 12, swelling under the action of water, under the action of heat released during manufacture, is combined with the base material 9. Part 4 described above, swelling under

- 6 013259 by the action of water, is formed entirely on the surface of the main part 1a of the joint located opposite the body 2, 2 of the pipe.

In accordance with the features described above, since the softened material 10, swelling under the action of water, under the action of heat, during production is combined with the base material 9, as shown in FIG. 6 (b), and in addition to the mutual adhesion of materials 9, 12, material 12, which swells under the action of water, rarely lags behind the base material of the nonwoven material before water absorption. In addition, even after the material swelling under the action of water absorbs water and becomes swollen under the action of water, as shown in FIG. 6 (c), material 12, swelling under the action of water, rarely lags behind the base material of the nonwoven material.

Since during drying the material 12 is compressed to its original volume, pipe connection 1 can be used again after it was once used. In addition, since the material 12, swelling under the action of water, is evenly distributed in part 4, swelling under the action of water, a corresponding waterproofing effect can be realized.

In addition, during their stay in the dried state before swelling under the action of water and after swelling under the action of water, a gap C for the passage of water is formed between part 4, which swells under the action of water, and the body 2, 2 of the pipe. In accordance with the above-described feature, the operation of fixing and unlocking the pipe connection 1 can be performed very smoothly and easily, since the above-described clearance C is formed between part 4, which swells under the action of water, and the pipe body 2 during drying before and after swelling under the action of water . More specifically, the contact resistance of the water-swellable part 4 with the body 2 of the pipe 2 is small at any time of fixing and unlocking the pipe connection 1, and thus the separation of the material swelling under the action of water becomes even more due to external mechanical force. rare, which improves the performance of multiple use of the pipe connection 1.

In accordance with the above-described gap C, since water easily passes into part 4, which swells under the action of water, the part which swells under the action of water expands rapidly to allow for the effect of good waterproofing.

FIG. 7 shows a pipe connection according to a second embodiment of the invention. Pipe connection 1 contains the main part 1a of the compound, made of synthetic resin or synthetic rubber and having a continuous concave-convex spiral configuration 1b, which contains a convex part 1A, protruding inward in the direction of the diameter, and a concave part 1b, forming the outer peripheral part, and part 4, swelling under the action of water, having a uniform thickness, completely formed over the entire inner surface of the main part 1a of the pipe joint. Pipe connection 1 connects one pipe body 2 (i.e. a pipe) having a helical configuration 2a, comprising a protruding part 2aA and a recessed part 2aB, with the body 2 of another pipe (i.e., with a pipe) having a helical configuration 2a containing the protruding portion 2aA and the recessed portion 2aB, in the same manner as previously described in the first embodiment.

FIG. 8 and 9 show an example of a connection main part 1a having 5 helical convex portions 1A in the range of 4 to 6 in the axial direction. When the number of convex portions of 1A is chosen to be in the range of 4 to 6, both the corresponding waterproof property and the tensile strength can be guaranteed, even if the positions of the end portions 2A, 2A are moved in any direction, as shown in FIG. 10 and 11 when the pipe connection 1 is fixed. In FIG. 10 shows the condition of part 4, swelling under the action of water, during the time before water absorption and during drying. FIG. 11 shows the condition of part 4, swelling under the action of water, during the absorption of water and swelling to create a waterproofing.

FIG. 12 and 13 show an example of a main part 1a of a joint having 2.5 helical convex parts 1A in the range of at least 2 in the axial direction. In this case, both the corresponding waterproof property and the ultimate strength can be guaranteed if the locations of the end portions 2A, 2A are in the center or essentially in the center of the joint main part 1a in the axial direction when the pipe connection 1 is fixed. Additionally, the value the screwing in and the amount of unscrewing become minimal, thus improving the ease of making the joint. FIG. 12 shows the state of part 4, swelling under the action of water, during the time before water absorption and during drying. FIG. Figure 13 shows the condition of part 4, which swells under the action of water, during water absorption and swelling, in order to create a waterproofing.

FIG. 14 and 15 show an example of a joint main part 1a having 8 helical convex portions 1A in the range from 7 to 8 in the axial direction. In this case, both the corresponding waterproof property and the ultimate strength can be guaranteed, even if the locations of the end portions 2A, 2A are in any direction, as shown in FIG. 14 and 15, when the pipe connection 1 is fixed. Additionally, in this case, the tensile strength can be further increased as compared with the example shown in FIG. 8-13. FIG. 14 shows the state of part 4, swelling under the action of water, during the time before water absorption and during drying. FIG. 15 shows the state of part 4, swelling under the action of water, during the absorption of water and swelling,

- 7 013259 to create a waterproofing.

In essence, with the number of convex parts of 1LL below 2, the required tensile strength cannot be obtained. On the other hand, with the number of convex portions of 1A more than 8, the usability of the connection is reduced due to an excessive number of screwing and loosening. In particular, when the pipe body 2 or 8 has a tendency to bend, it becomes difficult to make the connection. Thus, the number of convex portions of A1A should be limited to from 2 to 8, more preferably from 2.5 to 7.5, as shown in FIG. 8-15, to guarantee both the ultimate strength and the convenience and ease of use of the joint.

Additionally, the concave-convex spiral configuration 1b is formed together with the connection main body 1a, which is installed by screwing into the appropriate concave convex spiral configuration 2a of the pipe body 2, as shown in FIG. 16. As seen in FIG. 16, when the pipe housings 2, 2 are connected using the joint main part 1a, it is arranged to overlap the inner end of the spiral convex part 1AA, protruding inward in the direction of the diameter of the main part 1a of the connection, the outer end of the protruding part 2AA adjacent to the concave-convex helical configuration 2a, a predetermined value in the direction of the diameter. The internal end mentioned above is the internal end of the protruding part 1A in a state that does not contain part 4, which swells under the action of water, in this case.

For the amount of overlap, an arbitrary value can be set corresponding to the outer diameter 2 of the pipe body 2. In accordance with the overlapping structure, a sufficient tensile strength (release strength) of the pipe connection 1 can be guaranteed.

The main part 1a of the compound in the examples shown in FIG. 1-15, made of synthetic resin. However, the main part 1a of the compound can be made of synthetic rubber, as shown in FIG. 16. In addition, the connection main body 1a can be made with the possibility of having a flat outer peripheral part without having a groove, as shown in FIG. 17

As described above, the pipe connection has a main part 1a of the connection for connecting the end parts of the respective pipe housings 2, 2 having concave-convex helical configurations 2a, 2a. Part 4, swelling under the action of water, is placed on the inner surface of the main part 1a of the compound. When the housings 2, 2 of the pipes are connected with the help of the main part 1a of the joint, an essentially homogeneous gap C is formed between the outer surface of the housings 2, 2 of the pipes and the part 4 swelling under the action of water.

Part 4, swelling under the action of water, absorbs water and swells to create a waterproofing between the pipe body and the main part 1a of the joint. The value of the gap C described above can be set within a range from 0.2 to 5.0 mm in accordance with the external diameter of the bodies of 2, 2 pipes. According to the above described feature, screwing in and unscrewing the joint main part 1a can easily improve the usability of the joint for the main joint part 1a, since a substantially uniform gap is formed. Additionally, even if the pipe body 2 has a tendency to bend, the pipe body 2 is easily connected with such pipe connection 1. In addition, the water passage through which water or humidity can leak out is protected by the gap described above so that the creation of waterproofing can be reliably performed by the rapid absorption and swelling of part 4, swelling under the action of water when it absorbs water. Additionally, for a material swelling under the action of water, or a water absorbing resin used in part 4, swelling under the action of water, it is possible to prevent separation due to the action of an external force, thus increasing the durability of the pipe connection 1.

Additionally, the feature of the spiral protruding part (see concave-convex spiral configuration 1b), formed together with the main part 1a of the joint, which is installed by screwing into the corresponding concave-convex spiral configuration 2a of the pipe body 2. When the housings 2, 2 of the pipes are connected using the joint main part 1a, it is designed so that the end of the spiral convex part 1A, protruding inward in the direction of the diameter of the main part 1a of the connection, overlaps the end of the protruding part 2AA, 2AA adjacent to the concave convex spiral configuration 2a, 2a, in the direction of the diameter. In accordance with the above-described feature, a sufficient tensile strength (release strength) can be guaranteed, since the end of the spiral convex part 1AA protruding inwards in the direction of the diameter of the main part 1a of the joint overlaps the end of the protruding part 2aA, 2aA adjacent to the concave convex spiral configuration 2a , 2a in the direction of the diameter.

In addition, the protruding portion 1 ά for the join operation is provided on the outer peripheral side of the main joint portion 1a. According to the above feature, the protruding part 1 прос prevents the operator's hand from slipping during the connection operation. As a result, the operation of screwing and unscrewing the pipe connection 1 becomes easy.

Additionally, the sign of the number of helical protrusions in the axial direction of the joint main part 1a (see the number of convex parts of 1A) is set to be within the range of 2 to 8. In accordance with the sign, both the corresponding waterproof property and the tensile strength can to be guaranteed at the time when the body 2, 2 pipes connect

- 8 013259 are carried in the main part 1a of the connection. More specifically, when the number of convex parts of lL is lower than 2, the required tensile strength cannot be obtained. On the other hand, with the number of convex portions of 1A more than 8, the usability of the connection is reduced due to an excessive number of screwing and loosening. When the body 2 or pipe has a tendency to bend, it becomes difficult to connect. Thus, the number of convex portions of 1A must be limited in the range from 2 to 8, more preferably in the range from 2.5 to 7.5, in order to guarantee both the tensile strength and the convenience and ease of use of the joint.

In accordance with the characteristic of the invention and the example described above, the number of spiral protruding parts corresponds to the number of convex parts 1A.

FIG. 18 and 19 show the pipe connection for the third embodiment of the invention. Pipe connection 1 connects the housings 2, 2 pipes made of synthetic resin in the same way as in examples 1 and 2. Nonwoven sheets 23 are layered in such a way that both end parts 23a, 23a have essentially the same the same thickness, and thus formed part 4, swelling under the action of water, layered or sheet type, which swells, absorbing water. Then, in this way, layered non-woven sheets are formed over the entire inner surface (or part of the inner surface) of the joint main part 1a.

The above-described part 4, swelling under the action of water, is formed as shown in FIG. 20. More specifically, non-woven material 21, swelling under the action of water, which is placed on the side facing the outer surface of the pipe body 2 and nonwoven material 22 that does not swell under the action of water, which is placed on the side facing the inner surface of the joint main part 1a, are completely layered to form a non-woven sheet 23. The non-woven sheet 23 is twisted to form a substantially cylindrical shape. The two end portions 23a, 23a of the twisted non-woven sheet 23 are laminated in the vertical direction (in the direction of the diameter) in order to form the laminated part in width A, in which the thickness is essentially the same in both the circumferential direction and the length direction. The laminated portion 23b of both end portions 23a, 23a is mounted entirely laminated using a needle-punch die 25 in the length direction (including the axial direction) along the laminated portion 23b.

For example, when a pipe body 2 is connected having a connection size with a diameter of from about 30 to about 200 mm, and the width of the layered part 23B of the nonwoven sheet 23 is A mm, then in the case where part 4, swelling under the action of water, is completely formed on the inner surface pipe connection 1, the width A of the layered part 23b is preferably within the range of from about 0 to about 80 mm.

More specifically, with a layer width of more than about 80 mm, the thickness of the laminated part 23B is hardly formed to be uniform, and the contact resistance applied to the part with a large thickness becomes large, so that the connection and separation of the pipe body 2 becomes difficult . On the other hand, if the width of the layered part A is less than about 0 mm, it is difficult to completely apply a layer of nonwoven sheet 23 to both end parts 23a, 23a to form a cylindrical shape and fix it so that water leakage is created along the border line of both end parts 23a , 23a, and, thus, there is no way to prevent the passage of water.

Accordingly, if the layered parts of both end portions 23a, 23a of the sheet 23 of the nonwoven sheet forming part 4, swelling under the action of water, are formed so as to have a width A, the thickness of which is preferably uniform, A is preferably within a range from approximately 0 to approximately 80 mm (approximately 0 <A mm <approximately 80 mm).

On the other hand, when the laminated width A is set so that it is equal to at least about 25% of the outer diameter of the pipe body 2, its thick portion increases to increase the contact resistance. The layered width A is preferably set to be within the range of from about 15 to about 20%, given the waterproofing property and cost-effectiveness.

Although part 4, swelling under the action of water, is completely molded over the entire inner surface of the main part 1a of the joint during the formation of the pipe joint in the example, part 4, which swells under the action of water, may be completely formed in a circular or spiral direction on the inner surface of the corresponding end parts the main part 1A of the connection, the inner surface of which is facing the outer surface from the screwing side of the pipe body 2. Additionally, both end portions of the nonwoven material 21 swelling under the action of water, forming the nonwoven sheet 23, are vertically layered and both end portions of the nonwoven material 22 not swelling under the action of water overlap in the docking state in the circumferential direction. In accordance with the characteristic described above, from part 4, swelling under the action of water, one can expect approximately the same function and effect as from part 4 described above, which swells under the action of water.

As a mounting method, instead of the needle-punched die 25 described above, there is a method of installation using an adhesive substance, such as a resin, a method of installation using a piercing machine and a method of installation using a stapler. For fastening can be used one or more fastening methods with their combination.

Hereinafter, a method for forming part 4, which swells under the action of water, is described, together with the main part 1a of the compound along its inner surface, in order to form the pipe connection 1 described above.

As shown in FIG. 21 and 22, part 4, swelling under the action of water (see Fig. 20), formed (working and twisted), essentially in a cylindrical form, is installed on the outer surface of the inner mold 27 of the molding machine 26. Divided into many parts (for example , into two parts) the external form 28 is installed on the internal form 27 (which is also divided into many parts). Then, the upper mold 29 is installed on the upper ends of the inner mold 27 and the outer mold 28. The space formed by the surface of the part 4 swelling under the action of water installed on the inner mold 27 is filled with the inner surface of the outer mold 28 and the inner surface of the upper mold 29 which is heated and melted at a given temperature. A part of the inner surface of the main part 1a of the joint and a part 4 swelled under the action of water are molded into the appropriate shape in part 27a of the essentially spiral groove formed on the outer surface of the inner form 27. Part of the outer surface of the joint part 1a formed jointly and part 4 , swelling under the action of water, are cast in the appropriate form, essentially, in a helically protruding part 28a, formed on the inner surface of the outer form 28.

The laminated portion 23b of both end portions 23a, 23a forming the nonwoven sheet 23 is pressed by a force applied in the direction of the diameter and in the thickness direction in order to completely form the layered portion 23b, which should be substantially uniform in thickness in both the circumferential direction and and in the length direction (see Fig. 23).

Among other things, when the layered part 23B of the nonwoven sheet 23, the forming part 4, swelling under the action of water, is formed so as to be substantially uniform in thickness, and then the part 4 thus formed, swelling under the action of water, is formed together with the main part 1a of the compound on its inner surface, the layered part of the nonwoven sheet 23 is additionally pressed by the force applied during the second formation (for example, the pressure created during pressing and pouring during the filling of the molten nteticheskoy resins or something similar). Thus, the thickness of the layered part becomes thinner than during the first forming, in order to worsen the water passing property.

In order to form a layered portion 23b of a corresponding thickness, it is preferable to form the layered portion 23b with substantially uniform thickness, a single pressure force applied at the time when the nonwoven sheet 23 is formed together with the base part 1a of the joint, forming a tube connection 1 on its inner surface .

In addition, non-woven material 22, non-swelling under the action of water, forming part 4, swelling under the action of water, are set together with the main part 1a of the compound over its entire inner surface. Part 4, swelling under the action of water, is generally formed so as to have an essentially uniform thickness in both the circumferential direction and the length direction, and is also formed so as to have an essentially uniform gap between its surface. and the outer surface of the housing 2 pipe.

After the completion of pouring, the outer mold 28 and the upper mold 29 are separated and then the inner mold 27 is divided into many smaller parts and removed to reduce its diameter so that the pipe connection 1 can be separated and removed from the mold. When the main body 1a of the joint formed with the water swellable part 4 is separated and removed from the inner mold 27, the operation for forming the tubular joint 1 shown in FIG. 24 is over. Alternatively, the pipe connection 1 formed together with the water-swelled part 24 can rotate in a spiral direction to separate from the inner mold 27. In the same manner as described above, various pipe connections 1 are made to connect the housings 2, 2 pipes having different diameters.

As described above, since both end portions 23a, 23a of nonwoven sheet 23 forming part 4, swelling under the action of water, are layered to have a substantially uniform thickness, or since both end portions 23a, 23a are layered to form layered the portion having a width A, which has a substantially uniform thickness in the circumferential direction, part 4, swelling under the action of water, in general, can be formed so as to have a substantially uniform thickness.

When part 4, swelling under the action of water, absorbs water, part 4, which swells under the action of water, generally swells substantially uniformly in thickness in a circular direction. Thus, a gap or path of water (water leakage) is not created in the layered part 23b of part 4, swelling under the action of water, so that the leakage and leakage of water through it can be successfully prevented.

In addition, a large contact resistance that breaks the connection of the pipe connection 1 and

- 10 013259 pipe body 2 locally not applicable. Thus, the contact resistance related to the corresponding part of the front surface is small, and therefore, the operation of screwing the end part of the body 2 of the pipe 2 into the pipe connection 1 and the operation of unscrewing the end part of the body 2 of the pipe from the pipe connection 1 can be performed simply and easily, improving convenience and ease of use.

Hereinafter, a pipe connection 31 according to a fourth embodiment of the invention is described. FIG. 25 shows pipe connection 31. FIG. 25 (a) is a perspective view of it. FIG. 25 (b) is a cross-sectional view thereof.

Pipe connection 31 is a cylindrical element having an internal groove 39 in the form of a continuous spiral groove. Parts with holes on both sides of the pipe connection 31 are parts 33a, 33a of the liners. The pipe body for the connection is screwed into the pipe connection 31 from the side of part 33 a, 33a of the liner. The groove pitch and groove depth are determined respectively by the pipe body that is to be connected. More specifically, the shape of the inner groove 39 corresponds to a concave-convex spiral configuration formed on the outer surface of the pipe body, which is to be joined, so that the pipe body can be screwed in when installed in the pipe connection. For example, a polymer such as high-density polyethylene (HOPE), polypropylene, acrylonitrile-butadiene-styrene (AVB), or the like can be used as the material for tube connection 31.

A stopper 37 is installed on the inner surface of the pipe connection 31, which protrudes deeper towards the center of the pipe connection, exceeding the helical internal groove 39 of the pipe connection 31. The stopper 37 is a part to prevent the pipe body from being screwed too deep inside. Since the pipe joint stopper 37 is located in the direction toward the center in the cross section of the pipe joint between the outer surface of the convex part and the inner surface of the concave part in the direction of the diameter in the cross section of the pipe body, the pipe body contacts the stop 37 to allow the body to stop pipes at the location of the stopper.

The stopper 37 is installed in a position located at a distance b1 from one end (part 33a of the liner) of the pipe connection 31 and at a distance b2 from the other end (part 33b of the insert). The length b1 is approximately 2 times the length b2. More specifically, when the total length of the pipe connection 31 is equal to b, the following equations are satisfied:

B1 = (2/3) b, b2 = (1/3) b

The stopper 37 is set not strictly based on the above equations, taking into account the thickness of the stopper 37 and the inner groove 39. The position of the stopper 37 can be allowed to vary by the thickness of the stopper or one step of the inner groove 39 (the pitch means the distance between adjacent inner grooves in the axial direction of the pipe connection 31) .

In the example shown in FIG. 25 (b), the stopper 37 is installed respectively in the upper and lower parts in cross section. However, the stopper 37 can be installed on one part in the circumferential direction of the pipe connection 31. The length b2 (shorter distance between the stopper 37 and the end part of the pipe body) is preferably at least 1.5 steps of the internal groove to reliably attach the pipe body. The length b2 is more preferably equal to at least double the pitch of the inner groove 39.

The sheet 35, swelling under the action of water, in the form of a sheet element is placed on the inner surface of the pipe connection 31 along the internal groove 39. The sheet 35, which swells under the action of water, can be formed together with the pipe connection 31 or the sheet 35, which swells under the action of water, can to be superimposed on the inner surface of the pipe connection after pressing the pipe connection 31. A method of manufacturing the pipe connection 31 is described below.

Sheet 35, swelling under the action of water, is superimposed only within the range of length E1, E2 from the corresponding end of pipe connection 31. The length E1 and length E2 are approximately the same. The length of E1 and the length of E2 are shorter than the length of L2. More specifically, the sheet 35, swelling under the action of water, is applied only near the end of the pipe connection 31 (in a predetermined range from the end of the pipe connection 31). The range of the imposed sheet 35, swelling under the action of water, is shorter than the shorter distance from the end of the pipe joint to the stopper 37.

As the sheet 35 swelling under the action of water, any element capable of absorbing and expanding water can be used. For example, a non-woven material or the like may be used that is formed by mixing a water-swellable base like a granular powder or a material like resin with high water absorption or the like and a binder if necessary. In addition, a nonwoven material, a base that swells under the action of water, and a thermoplastic synthetic resin with a low melting point, such as a material similar to that melting using casting heat, can be kneaded. For example, the sheet 35, swelling under the action of water, can be formed to be identical to part 4, swelling under the action of water.

Sheet 35, swelling under the action of water, may contain not only a single layer, but also be

- 11 013259 multi-layered. For example, non-woven material that does not have the property of swelling under the action of water, can be formed on the inner surface of the layer, swelling under the action of water to protect the layer, swelling under the action of water. Therefore, a nonwoven material, conventional synthetic resin such as polyethylene terephthalate, polyethylene, polypropylene, EVA or the like cannot be used, and a polymer having a heat resistance is preferred.

A method for connecting pipe bodies using a pipe connection is described. FIG. 26 shows the method of connecting the pipe housings 41a, 41b using a pipe connection 31. As described above, both the pipe bodies 41a, 41B have a continuous spiral concave-convex configuration on their outer surface. The spiral configuration of the pipe bodies 41a, 41b has a shape corresponding to the internal groove 39 of the pipe connection 31.

First, as shown in FIG. 26 (a), the pipe body 41a is placed near the end part of the pipe connection 31 along the axis of the pipe connection 31. The pipe body 41a, which is to be screwed in first, is placed on the side of the part 33a of the pipe connection insert 31. The distance along the axis of the pipe connection between the end part of the pipe connection 31 and with a stopper more (side b1 in Fig. 25 (b)) on the side of the liner 33a.

Then the pipe connection 31 is screwed into the pipe body 41a. At this moment, the spiral structure on the outer surface of the pipe body 41a is screwed into the inner groove 39 of the pipe connection 31. When the pipe connection 31 is screwed into the pipe body 41a, the tip end of the pipe body 41a comes into contact with the stopper 37, as shown in FIG. 26 (b). When the tip of the tip of the pipe body 41a is in contact with the stopper 37, the pipe connection 31 can no longer be screwed into the pipe body 41a. Accordingly, in the joining operation, it is easy to recognize the moment when the pipe body 41a comes into contact with the stopper 37.

In the above-described condition, the tube housing 41b is placed along the axis with the tube connection 31 on the side of the liner portion 33b on the opposite side from the tube connection portion 33a of the tube joint 31. The axial distance of the tube joint between the end portion of the tube joint 31 and the stopper is shorter (side b2 in Fig. 25 (b)) from the side of part 33b of the liner.

Then the pipe connection 31 is screwed into the pipe body 41B, rotating the pipe connection 31 in the opposite direction. At this moment, the spiral structure on the outer surface of the pipe body 41b is screwed into the inner groove 39 of the pipe connection 31. The pipe connection 31 moves in the opposite direction (towards the outside of the pipe connection) relative to the pipe body 41a, while the pipe connection 31 moves forward (in the direction of the outer side of the pipe connection) relative to the pipe body 41b. When the pipe connection 31 is screwed into the pipe body 41B, the tip of the pipe body 41B tip comes into contact with the stopper 37, as shown in FIG. 26 (s). When the end of the tip of the casing 41b the pipe is in contact with the stopper 37, the pipe connection 31 can no longer be screwed into the casing 41b of the pipe. Accordingly, in the joining operation, it is easy to recognize the moment when the pipe body 41a comes into contact with the stopper 37.

Thus, the connecting operation of the pipe bodies 41a, 41b is completed. At this moment, the part E1 in which the pipe body 41a and the pipe connection 31 overlap is substantially identical to the part E2 in which the pipe body 41B and the pipe connection 31 overlap. The sheet 35, swelling under the action of water, is formed only in the range from the end of the pipe connections 31 to a point lying closer than b2 (i.e., E2). Accordingly, the sheet 35, swelling under the action of water, is not formed near the ends of the tips of the bodies 41a, 41b of the pipes.

FIG. 27 shows an enlarged partial sectional view of the joint shown in FIG. 26 (s). The end of the tip of the stopper 37 in the direction of the diameter of the pipe connection 31 should be located within the inner surface H1 of the pipe body 41b (or the pipe body 41a) and the outer surface H2 of the pipe body 41b (or the pipe body 41a) in the direction of the pipe connection diameter 31. More specifically, the stopper 37 can function as a stopper under the following condition: the tip end of the stopper 37 protrudes from the outer surface of the pipe body 41B (or the pipe body 41a) in the direction of its center and at the same time the tip of the tip of the fuse stop 37 It is directed backward from the inner surface H1 of the pipe body 41B (or the pipe body 41a) in the direction of its center.

Now the outer surface of the convex part in the pipe body 41a, 41b is the part having the maximum diameter (the outer surface of the tip end of the convex part of the pipe body), taking into account the spiral configuration of the pipe body 41a, 41b. The inner surface of the concave part in the pipe body 41a, 41b is the part having the minimum diameter (the inner surface of the tip end of the concave part of the pipe body), taking into account the spiral configuration of the pipe body 41a, 41b.

The following describes a method of manufacturing a pipe connection. FIG. 28 shows an example of a method of manufacturing a pipe connection 31. For example, as shown in FIG. 28 (a), the two halves of the pipe 43 are made, and one pair of the halves of the pipes 43 is joined to make the pipe connection 31.

FIG. 28 (a) is a perspective view to represent half of the pipe 43. FIG. 28 (b)

- 12 013259 shows a bottom view to show half of the pipe 43. In FIG. 28 (c) is a side view of a connected pair of pipe halves 43a, 43b facing each other.

The inner groove 39 is formed on the inner surface of the half of the pipe 43 and the sheet 35, swelling under the action of water, is applied across the inner surface along the inner groove 39. The range in which the sheet 35, swelling under the action of water, is superimposed, is as described above. The stopper 37 is provided on the inner surface of the halves of the pipe 43. The stopper protrudes inward from the inner surface of the half of the pipe 43. The position in which the stopper is formed is the same as described above.

Thus, a pair of pipe halves 43 (43a, 43b) is formed and the corresponding connection surfaces, such as the bottom surface, are joined and joined. The pipes halves 43a, 43b are connected in such a way that the inner groove 39 is formed continuous. Further, when a stopper is formed on both halves of the pipe, the halves of the pipe are connected in such a way that the locations of the stoppers are the same (i.e., the distance from the half of the pipe 43 to the stopper is the same for the respective stoppers).

The connection of the tube halves 43a, 43b is carried out using a well-known method, such as glue, ligament or welding. In order to increase the joint surface, a portion of the joint surface of the half of the pipe 43 is expanded outwardly to form a flange portion. As shown in FIG. 28 (c), the connected pipe halves 43a, 43b with a stopper formed in a cross-sectional view along the line Ι-Ι correspond to the embodiment shown in FIG. 25 (b).

FIG. 29 illustrates a method for forming the halves of a divided pipe 43. Half of the pipe 43 may be formed, for example, by injection molding. The fixed form 47 and the movable form 49 are used for injection molding. The fixed form 47 has a surface configuration corresponding to the internal form (corresponding to the internal groove 39 of the pipe connection 31) of the half pipe 43. To create the hole, the fixed form has the shape of a semicircle in cross section and also has a protruding shape. The recessed part 55 is placed in a predetermined position in a fixed form. The recessed portion 55 corresponds to the stopper 37.

The movable form 49 forms the side of the outer surface of the half of the pipe 43 and has in cross-section a concave shape corresponding to the external shape of the half of the pipe 43. When the fixed form 47 and the movable form 49 are combined, a cavity having the shape of a half of pipe 43 is formed between them.

The sprue 53 is provided as part of the movable form 49. The injection part 51 is placed outside the sprue 53. The injection part 51 is an element for introducing the heated resin through the end of the tip.

To cast half the pipe 43, first of all, a sheet swelling under the action of water is placed in a predetermined position on the surface of the fixed form 47. In the situation described above, the movable form 49 is superimposed on the fixed form and fixed. Then through the sprue 53 resin is introduced into the injection cavity using the injection part 51.

As shown in FIG. 29 (b), the resin is poured into the cavity and the resin is pressed in the form of a cavity formed by the fixed form 47 and the mobile form 49. At this moment the sheet 35, which swells under the action of water, is pressed against the fixed form 47 by the resin in order to form a whole surface configurations of a fixed form 47.

After the resin is cooled, the movable form 49 is removed and the pressed split half of the pipe 43 is separated from the stationary form by a pusher (not shown). Thus, half of the pipe 43 can be obtained, which is completely formed together with the sheet 35 swelling under the action of water and the stopper 37.

The pipe connection 31 may be formed by blow molding. The draft form is provided for a split form, and after the draft form is solidified by cooling, the form is removed and thus the pipe body is molded. An internal configuration (inner groove 39, stopper 37, or other) is formed on the inner surface of the mold. Additionally, the sheet 35, swelling under the action of water, is glued in a predetermined position on the inside of the pipe body with an adhesive substance to form a pipe connection 31.

As described above, in accordance with the pipe connection 31 according to the fourth embodiment of the invention, the pipe bodies 41a, 41b can be easily and securely connected. In particular, the stopper 37 is positioned in such a way that the distances from the corresponding ends of the pipe connection 31 to the stopper will be approximately 1 to 2. According to the characteristic, since during the operation, the pipe connection 31 is screwed into the housing 41a, 41b to make the connection, until the pipe body comes into contact with the stop 37, the usability is excellent. Additionally, when connecting, the corresponding parts in which the pipe housings 41a, 41b overlap the pipe connection 31 is substantially identical. Accordingly, the pipe bodies 41a, 41b can be protected from falling out of the pipe connection 31 or from water leakage into the pipe body.

Additionally, since the range in which sheet 35 is superimposed, swelling under the action of

- 13 013259 water, shorter than the distance from the end of the pipe connection 31 to the stopper 37, no sheet 35 swelling under the action of water is placed near the end of the tip of the pipe body 41a, 41b in the state in which the pipe bodies 41a, 41b are attached. Therefore, even if the sheet 35 swelling under the action of water expands, no force is created in the end portion of the housings 41a, 41b of the pipes. Thus, the end part of the pipe body 41 is not deformed and is not damaged. Accordingly, when an electrical wire or the like is inserted into the pipe body 41a, 41b, the electric wire or the like does not hang or stop at the end portion of the pipe body 41a, 41b.

In addition, since the height of the stopper is set so as not to protrude to the center of the pipe through the inner groove of the pipe body, the electrical wire or the like does not hang on the stopper 37 when the electric wire or the like is inserted into the pipe body 41a, 41b .

Additionally, since the stopper 37 is entirely molded using injection molding or blow molding, its manufacture is simple.

The following describes an example of a modified fourth embodiment. FIG. 30 is a sectional view of a modified example of pipe connection 70 according to a fourth embodiment of the invention. In the following description, elements that perform the same function as the pipe connection 31 shown in FIG. 25 are represented by the same reference numbers and symbols and their repeated description is omitted.

In the pipe connection 70 in the axial direction of the pipe connection 70, in contrast to the pipe connection 31, a plurality of stoppers 37 are installed. More specifically, the stoppers 37a, 37b are mounted on the inner surface of the pipe connection 70.

The stopper is installed in a place located at a distance b1 from the end of part 33a of the liner of a pipe connection 70. In other words, the stopper is installed in a place located at a distance of b2 from the end of part 33b of the Liner on the opposite side.

B1 and b2 are in a ratio of approximately 2 to 1. More specifically, when the total length of the pipe connection 70 is equal to b, the following equations are satisfied:

Ы = (2/3) (B1 + B2), T2 = (1/3) (B1 + B2) and b> b + B2.

Within the range that satisfies the above equations, the positions of the two stoppers 37a, 37b can be chosen arbitrarily.

When the following equations are satisfied, a perfectly balanced pipe connection can be obtained.

N = (2 / n) b, b2 = (1 / n) 1>

For example, when n = 4, the corresponding distances for the stoppers 37a, 37b become the same as b2. However, in terms of economic efficiency, a maximum of n = 5. With a length greater than this, the cost of manufacture becomes excessively high.

Additionally, when T = T1 + b2 (b is the total length of the pipe connection), the stoppers 37a, 37b are installed in the same position, thus becoming identical to the pipe connection 31 (with one stopper).

In addition, the length of the superimposed sheet, swelling under the action of water, is shorter than the length b2. More specifically, the sheet 35, swelling under the action of water, is applied only near the end of the pipe connection 70 (within a predetermined range from the end of the pipe connection 70). The range in which the sheet 35, which swells under the action of water, is superimposed, is even shorter than the length from the end of the pipe joint 70 to the stopper 37b (the length of the shorter side).

According to an example of a modified fourth embodiment of the invention, the same effect as for pipe connection 31 can be obtained. Additionally, the overlapping length can be made with the possibility of being the necessary minimum for a pipe connection of arbitrary length.

For example, the pipe connection according to the invention is not limited to the embodiments described above. When the stopper is prepared separately, the stopper can be attached to the inner surface of the pipe connection that does not have a stopper to form a pipe connection with the stopper. The stopper can be attached in a predetermined position on the inner surface of the pipe joint using glue or welding.

The shape of the stopper is not limited to the shape of the stopper 37 in the embodiments described above. The stopper can be installed on the part of the pipe connection in a circular direction or can be installed along the entire circular direction. For example, the stopper in the form of a ring can be recessed and installed in the inner groove 39 for a given length range.

In this case, even if the following equations are not strictly satisfied, it may be correct that the overlapping part is approximately identical when the pipe housings 41a, 41b are connected as described above.

Ы = (2/3) (Ы + Б2), Ь2 = (1/3) (Б1 + Б2) where Ь is the total length of the pipe connection.

- 14 013259

Claims (9)

1. A pipe connection containing the main part of the connection for connecting the end parts of the pipe bodies, in which the main material made of resin as the base material is a material that swells under the action of water, into which the material of the resin, which swells under the action of water and has a high point, is embedded melting, and a binder material are used for the manufacture of non-woven material, the main material and the material swelling under the action of water are combined by a binder material, molten heat released in the manufacture, in order to form a part that swells under the action of water, and a part that swells under the action of water, is formed together on the surface of the main part of the connection facing the pipe body. 2. A pipe connection containing the main part of the connection for connecting the end parts of the pipe bodies, in which the main material is made of resin as the base material, and a material that swells under the action of water, into which the material of the resin, which swells under the action of water and has low melting point, used for non-woven material, material swelling under the action of water, softened by the heat released during manufacture, combined with the main material to form part, times uhayuschuyu by water and a portion swells under the influence of water formed together on the surface of the main part of the compound to the body facing the pipe. 3. The pipe connection according to claim 1 or 2, in which a gap for the passage of water is formed between the part that swells under the action of water and the pipe body during drying before swelling under the action of water and after swelling under the action of water. 4. A pipe connection containing the main part of the connection for connecting the end parts of the pipe bodies having a concave-convex spiral configuration in which a part that swells under the action of water is provided on the inner surface of the main part of the connection, an approximately uniform gap is formed between the outer circular surface of the pipe body and a part that swells under the action of water when connecting the pipe bodies with the main part of the connection. 5. A pipe connection for connecting the end parts of the pipe bodies by screwing to the state of stopping the passage of water, in which both end parts of the part that swells under the action of water and formed on the inner surface of the main part of the connection, facing the outer circular surface of the pipe body, overlap. 6. A pipe connection for connecting the end parts of the pipe bodies by screwing to a state of stopping the passage of water, in which both end parts of the part that swells under the action of water and formed on the inner surface of the main part of the connection, facing the outer circular surface of the pipe body, overlap, and both end parts of the part that swells under the action of water overlap the width of the overlap, at which their thickness is approximately uniform in the circular direction. 7. The pipe connection according to claim 5 or 6, in which the width of the overlap of the part, swelling under the action of water, is set so as to approximately correspond to the size of the pipe body. 8. The pipe connection according to claim 5 or 6, in which after the part that swells under the action of water is wound approximately in a cylindrical shape and both end parts overlap, the overlapping end parts of that part that swells under the action of water are jointly fastened together with fasteners means. 9. A pipe connection having a spiral continuous groove formed on its inner surface comprises a sheet element superimposed on the inner circular surface of the pipe connection and a stopper protruding from the inner surface of the pipe connection in which the stopper is mounted at least in one axial position the direction of the pipe connection, and the ratio of the distance between one end of the pipe connection and the closure closest to it to the distance between the other end of the pipe connection and closest to it the stopper is set equal to approximately 1 to 2.