JP2016188696A - Connection structure and connection method for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure and a connection method by which pieces of piping having weatherproof properties can be strongly joined to each other.SOLUTION: A connection structure 100 of piping includes: a pair of pieces of piping 1, 1 each having an inner layer part 11 formed into a tubular shape, and an outer layer part 12 integrally provided with the inner layer part 11 on the outer side of the inner layer part 11 and having higher weatherproof properties than the inner layer part 11; a piping joint part 20 formed on an end part 1Z of each piece of piping 1 and having the outer layer part 12 not provided but the inner layer 11 exposed; a joint 3 formed into a tubular shape and from both ends of which the respective piping connection parts 20, 20 of the pair of pieces of piping 1, 1 are respectively inserted; and an adhesive layer 4 provided between the piping connection part 20 and the joint 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe connection structure and a connection method.

  Generally, a gutter that guides rainwater to a drain pipe is installed in a building such as an apartment, an apartment, or a detached house. The rain gutter is preferably formed of a material having high weather resistance because it is installed outdoors and exposed to ultraviolet rays. Therefore, as pipes used for rain gutters, etc., a pipe body formed in a tubular shape using a resin composition as a material, and a pipe body formed integrally with the pipe body on the outside of the pipe body, is formed of a resin composition having high weather resistance. An outer layer has been proposed (see, for example, Patent Document 1).

  By the way, when the required length of the installed gutter etc. is longer than member (pipe) length, some piping may be connected through a joint. An adhesive is applied to the end of each pipe, and the end of each pipe is inserted into both ends of the joint. Thereby, the edge part of each piping is joined to each edge part of a coupling, piping is connected via a coupling and is mutually connected.

JP 2002-254576 A

  However, when the pipes described in Patent Document 1 are connected to each other, the resin composition that forms the outer surface of the pipe has high weather resistance and insufficient adhesive strength with the adhesive. In addition, when the pipe is used as a pressure feeding pipe for pressure-feeding wastewater at a factory or the like, a load acting on the joint portion between the pipe and the joint by pressure feeding may increase. In either case, if the joining force between the pipe and the joint is insufficient, there is a problem that liquid flowing through the pipe leaks from the joint or the pipe comes out of the joint.

  Then, this invention is made | formed in view of the said situation, and provides the connection structure and connection method of piping which can join strongly the piping which has a weather resistance.

In order to achieve the above object, the present invention employs the following means.
That is, the pipe connection structure according to the present invention includes an inner layer portion formed in a tubular shape, and an outer layer portion that is provided integrally with the inner layer portion outside the inner layer portion and has higher weather resistance than the inner layer portion. A pair of pipes, formed at the end of each of the pipes, pipe joints where the outer layer part is not provided and the inner layer part is exposed, and formed into a tubular shape, each of the pipe joints from both ends And an adhesive layer provided between the pipe joint and the joint.

In the pipe connection structure configured as described above, pipe joint portions formed at the end portions of the respective pipes and having the inner layer portions exposed are respectively inserted into both end portions of the joint. An adhesive layer is provided between the pipe joint and the joint. That is, since the inner layer portion having a lower weather resistance than the outer layer portion is bonded to the joint via the adhesive layer, each pipe and the joint can be firmly bonded.
In addition, since the outer layer part having higher weather resistance than the inner layer part is provided in the part other than the pipe joint part in the pipe, the weather resistance of the pipe is ensured.

  In the pipe connection structure according to the present invention, it is preferable that the pipe joint portion has a configuration in which the inner layer portion is exposed when the outer layer portion is peeled off.

  In the pipe connection structure configured as described above, the pipe joint where the inner layer portion is exposed is configured by peeling the outer layer portion. That is, a pipe joint can be formed by peeling off the outer layer at the end of a general pipe having an inner layer and an outer layer. Therefore, since general piping can be adopted, versatility is high and costs can be suppressed.

  In the pipe connection structure according to the present invention, a plurality of convex portions extending in the circumferential direction may be formed on the surface of the pipe joint portion at intervals along the axial direction of the pipe.

  In the pipe connection structure configured in this way, convex portions extending in the circumferential direction are spaced along the axial direction of the pipe on the surface of the pipe joint (the surface of the exposed inner layer portion in the pipe pipe joint). A plurality are formed. Therefore, the tip of the convex portion is caught by the adhesive layer, and a large frictional force is generated between the surface of the pipe and the adhesive layer, so that the pipe is hardly peeled off from the joint layer.

  Further, in the pipe connection structure according to the present invention, the both ends of the joint are formed with insertion portions into which the pipe joint is inserted, and the length of the pipe joint along the axial direction is It may be shorter than the length along the axial direction of the insertion portion.

  In the pipe connection structure configured as described above, the length of the pipe joint portion along the axial direction is shorter than the length of the insertion portion along the axial direction. Thereby, all the pipe joint parts are arranged inside the insertion part, and are not exposed to the outside of the joint. Therefore, the portion exposed from the joint in the pipe is an outer layer portion having higher weather resistance than the inner layer portion, so that the weather resistance of the pipe is reliably ensured.

  Further, the pipe connection method according to the present invention is a pipe connection for connecting a pair of pipes having a tubular inner layer part and an outer layer part having higher weather resistance than the inner layer part via a joint. It is a method, peeling off the outer layer part at the end of each pipe, exposing the inner layer part, applying an adhesive to each exposed inner layer part, and both ends of a joint formed in a tubular shape And a joining step of joining the exposed inner layer portion and the joint together by inserting the exposed inner layer portion of each pipe.

In the pipe connecting method configured as described above, in the peeling step, the outer layer portion at the end of the pipe is peeled off to expose the inner layer portion. In the joining step, an adhesive is applied to the exposed inner layer portion, and the exposed inner layer portion of the pipe is inserted into both ends of the joint formed in a tubular shape, and the exposed inner layer portion and the joint are joined. Therefore, since the inner layer portion having a lower weather resistance than the outer layer portion is bonded to the joint via the adhesive, each pipe and the joint can be firmly bonded.
Further, since the outer layer portion having higher weather resistance than the inner layer portion is provided in the portion other than the joint in the piping, the weather resistance of the piping is ensured.

  According to the pipe connection structure and the connection method according to the present invention, the pipes can be firmly joined to each other.

It is sectional drawing which shows the connection structure of piping which concerns on one Embodiment of this invention. It is sectional drawing which shows the structure of the piping joined by the connection structure of piping which concerns on one Embodiment of this invention. (A) It is AA sectional drawing in FIG. 2, (b) It is BB sectional drawing in FIG. It is a figure for demonstrating the joining method of piping which concerns on one Embodiment of this invention, (a) The figure which shows the state before joining of piping, (b) The figure after performing the peeling process, (c) Joining It is a figure after performing a process. It is a figure for demonstrating the peeling process of the joining method of piping which concerns on one Embodiment of this invention.

A piping connection structure according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a pipe connection structure according to an embodiment of the present invention.

  As shown in FIG. 1, the pipe connection structure 100 includes a pair of pipes 1, 1 and a joint 3 that connects the ends 1 </ b> Z of these pipes 1.

  Each pipe 1 is formed in a tubular shape and extends along the axis O. The pipe 1 has an inner layer portion 11 formed in a tubular shape, and a high weather resistance layer portion 12 (outer layer portion) provided integrally with the inner layer portion 11 so as to cover the outer side of the inner layer portion 11.

  As a material for forming the inner layer portion 11, for example, a hard vinyl chloride resin is employed. The high weather resistance layer portion 12 is formed of a material having higher weather resistance than the material forming the inner layer portion 11. As a material for forming the high weather resistance layer portion 12, for example, AES resin (acrylonitrile, ethylene-propylene-diene, styrene), AAS resin (acrylonitrile acrylonitrile rubber styrene) or the like is adopted. Materials added with, for example, carbon black or titanium oxide may be used. In the present embodiment, the thickness (the length in the radial direction) of the high weather resistant layer portion 12 is set to 0.06 mm or more and 0.25 mm or less.

FIG. 2 is a front view showing a configuration of the pipe 1 joined by the connection structure 100 of the pipe 1. 3A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line BB in FIG.
As shown in FIGS. 1 to 3, a pipe joint 20 is formed at the end 1 </ b> Z of each pipe 1. The pipe joint 20 is not provided with the high weathering layer 12 and the inner layer 11 is exposed. In the present embodiment, as will be described in detail later, the inner layer portion 11 is exposed by peeling off the high weathering layer portion 12 at the end portion 1Z of the pipe 1.

  As shown in FIG. 2, an uneven shape is formed on the outer peripheral surface of the pipe joint portion 20 (the outer peripheral surface of the exposed inner layer portion 11). The concave-convex shape includes an inclined wall portion 21A that gradually goes outward in the circumferential direction toward the end portion (end portion of the pipe 1) 1Z side of the pipe joint portion 20 along the axis O direction, and pipe joint along the axis O direction. The inclined wall portions 21B that gradually go inward in the circumferential direction toward the end portion 1Z side of the portion 20 are formed by being alternately arranged along the axis O direction.

  A portion where the radially outer end portion of the inclined wall portion 21A and the radially outer end portion of the inclined wall portion 21B intersect with each other is a convex portion 22 protruding in the circumferential direction. In other words, a plurality of convex portions 22 extending in the circumferential direction are formed on the outer peripheral surface of the pipe joint portion 20 at intervals along the axis O direction of the pipe 1.

  As shown in FIG. 1, the joint 3 is formed in a tubular shape with a through hole formed along the direction of the axis O. Insertion holes 31H (insertion portions) penetrating along the direction of the axis O are formed at both ends of the joint 3. Further, between the insertion holes 31H of the joint 3, a communication hole 32H (communication portion) that connects the insertion holes 31H is formed. The pipe joint 20 is inserted into the insertion hole 31H of the joint 3.

Further, the length L1 along the axis O direction of the pipe joint portion 20 is shorter than the length L2 along the axis O direction of the insertion hole 31H. A slight portion of the end portions of the pipe joint portion 20 and the high weather resistance layer portion 12 is inserted into the insertion hole 31H. Thus, the pipe joint 20 is all disposed inside the insertion hole 31H and is not exposed to the outside of the joint 3.
Further, the tip end portion of the convex portion 22 of the pipe joint portion 20 may abut on the inner peripheral surface of the insertion hole 31H of the joint 3.

Further, an adhesive layer 4 is provided between the inner peripheral surface of the insertion hole 31H and the outer peripheral surface of the pipe joint portion 20. In the present embodiment, as will be described later in detail, the adhesive layer 4 is configured by an adhesive applied to the outer peripheral surface of the pipe joint 20.
The pair of pipes 1, the pipe joint 20, the pipe joint 20, the joint 3, and the adhesive layer 4 described above constitute a connection structure 100 for the pipe 1.

Next, the connection method of the piping 1 which connects the piping 1 and 1 using the said piping 1 and the coupling 3 is mainly demonstrated using FIG.
Drawing 4 is a figure for explaining the joining method of piping 1 concerning one embodiment of the present invention, (a) The figure showing the state before joining of piping 1, (b) After performing a peeling process (C) It is a figure after performing a joining process. FIG. 5 is a view for explaining a peeling process of the method for joining pipes 1 according to an embodiment of the present invention.

  As shown in FIG. 2 and FIG. 4A, it has an inner layer portion 11 formed in a tubular shape, and a high weather resistance layer portion 12 provided integrally with the inner layer portion 11 so as to cover the outside of the inner layer portion 11. A pair of pipes 1 is prepared.

Next, a peeling process is performed.
As shown in FIGS. 4B and 5, the shaft S <b> 1 of the scraper S is inserted into each pipe 1, and the pipe 1 is supported by the shaft S <b> 1. In this state, the cutting part S2 of the scraper S is turned relative to the pipe 1, and the high weathering layer part 12 is peeled off. In this way, the work of peeling off the high weathering layer 12 of the pipe 1 is started from the end 1Z side of the pipe 1 and is performed for the length L1 along the axis O direction of the pipe 1. As a result, the high weathering layer portion 12 of the pipe 1 is peeled off, and a plurality of convex portions 22 extending in the circumferential direction are formed on the surface of the remaining inner layer portion 11 at intervals along the axis O direction of the pipe 1. Is done. This portion is a pipe joint 20.

  The thickness of the pipe 1 to be cut only needs to be equal to or greater than the thickness of the high weather resistance layer portion 12. In this embodiment, the thickness of the high weather resistance layer part 12 is 0.06 mm or more and 0.25 mm or less, and the thickness of the pipe 1 to be peeled is preferably 0.06 mm or more and 0.25 mm or less.

Next, a joining process is performed.
As shown in FIG. 4C, an adhesive is applied to the surface of the pipe joint 20, and the pipe joint 20 is inserted into the insertion hole 31 </ b> H of the joint 3. When the adhesive is cured, the adhesive layer 4 is formed between the inner peripheral surface of the insertion hole 31H and the outer peripheral surface of the pipe joint portion 20, and the pipe joint portion 20 and the joint 3 are joined.

In the connection structure 100 of the pipe 1 configured as described above, pipe joint portions 20 formed at the end portions 1Z of the respective pipes 1 and exposing the inner layer portions 11 are inserted into both ends of the joint 3, respectively. An adhesive layer 4 is provided between the pipe joint 20 and the joint 3. That is, since the inner layer part 11 having a lower weather resistance than the high weathering layer part 12 is bonded to the joint 3 via the adhesive layer 4, each pipe 1 and the joint 3 can be firmly bonded. Therefore, the pipe 1 can be used as a pressure feeding pipe.
Moreover, since the high weathering layer part 12 with higher weather resistance than the inner layer part 11 is provided in parts other than the pipe joint part 20 in the pipe 1, the weather resistance of the pipe 1 is ensured.

  Moreover, the pipe joint part 20 from which the inner layer part 11 is exposed is configured by peeling off the high weathering layer part 12. That is, the pipe joint 20 can be formed by peeling off the high weathering layer 12 at the end 1Z of the general pipe 1 having the inner layer 11 and the high weathering layer 12. Therefore, since the general piping 1 can be adopted, versatility is high and costs can be suppressed.

  Further, a plurality of convex portions 22 extending in the circumferential direction are formed on the surface of the pipe joint portion 20 (the surface of the exposed inner layer portion 11 in the pipe joint portion 20) with an interval along the axis O direction of the pipe 1. Has been. Therefore, the tip of the convex portion 22 is caught by the adhesive layer 4, and a large frictional force is generated between the surface of the pipe 1 and the adhesive layer 4, so that the pipe 1 is not peeled off from the adhesive layer 4 and removed from the joint 3. . Further, when the tip of the convex portion 22 is in contact with the inner peripheral surface of the joint 3, the tip of the convex portion 22 is caught by the inner peripheral surface of the joint 3, and the surface of the pipe 1 and the inner periphery of the joint 3 are Since a large frictional force is generated between the pipe 1 and the surface, the pipe 1 does not come out of the joint 3.

  Further, the length L1 along the axis O direction of the pipe joint portion 20 is shorter than the length L2 along the axis O direction of the insertion hole 31H. Thereby, all the pipe joint parts 20 are arrange | positioned inside the insertion hole 31H, and are not exposed to the outward of the coupling 3. FIG. Therefore, the portion exposed from the joint 3 in the pipe 1 is the high weathering layer 12 having higher weather resistance than the inner layer 11, so that the weather resistance of the pipe 1 is reliably ensured.

(Examples 1, 2 and Comparative Examples 1, 2, 3)
Hereinafter, Examples 1 and 2 and Comparative Examples 1, 2 and 3 of the pipe connection structure will be described with reference to Table 1.

As shown in Table 1, in Comparative Example 1, the pipe (pipe) has an inner layer portion, but does not have a high weather resistance layer (high weather resistance layer portion). In Comparative Examples 2 and 3, and Examples 1 and 2, the pipe has a configuration having an inner layer portion and a high weather resistance layer.
In Comparative Examples 1 and 3 and Example 2, a hard vinyl chloride pipe adhesive (Eslon Adhesive (registered trademark) No. 73S) mainly composed of acetone, methyl ethyl ketone, cyclohexanone, or the like is used as the adhesive. In Comparative Example 2 and Example 1, a hard vinyl chloride pipe adhesive (Eslon Adhesive (registered trademark) No. 100S) mainly composed of tetrahydrofuran, methyl ethyl ketone, cyclohexanone, or the like is used. Eslon adhesive No. 100S uses tetrahydrofuran with high solubility and has higher adhesive strength than Eslon adhesive No. 73S.
In Examples 1 and 2, a scrape (pipe joint) having an uneven shape is formed at the end of the pipe. In Comparative Examples 1, 2, and 3, no scrape is formed at the end of the pipe.

A tensile test and a long-term hydraulic fracture test (creep test) were performed on Examples 1 and 2 and Comparative Examples 1, 2 and 3, respectively.
In the tensile test, the joint between the joined pipe and socket (joint) is cut into a dumbbell shape. The test sample is obtained by bonding a 50A pipe and a socket and cutting a strip-shaped dumbbell having a width of 10 mm. And the force required until it destroyed by pulling from both ends with the conditions of 60 degreeC and the tensile speed of 5 mm / min was measured.
In the long-term water pressure fracture test (hot internal pressure creep water pressure test), a test body in which a 50A pipe and a TS socket were bonded and joined was used, and a pressure of 1.0 MPa was applied to the pipe at 60 ° C. to measure the tolerable time. .

As shown in Table 1, Example 2 is different from Comparative Example 1 in that the adhesive used is common, but has a high weathering layer and a scrape. In the experimental results of Example 2 and Comparative Example 1, the measured value of Example 2 is higher than that of Comparative Example 1 in the tensile strength test. Therefore, it turns out that tensile strength improves by providing a highly weather-resistant layer and a scrape.
Example 1 is common in that it has an adhesive and a high weathering layer used, but differs in that it has a scrape, as compared with Comparative Example 2. In the experimental results of Example 1 and Comparative Example 2, the measured value of Example 1 is higher than that of Comparative Example 2 in the tensile strength test and the long-term hydraulic fracture test. Therefore, it turns out that the strength with respect to tensile strength and pressure improves by providing a scrape.
Similarly, compared with Comparative Example 3, Example 2 is common in that it has an adhesive and a high weathering layer used, but differs in that it has a scrape. In the experimental results of Example 2 and Comparative Example 3, the measured value of Example 2 is higher than that of Comparative Example 3 in the tensile strength test and the long-term hydraulic fracture test. Therefore, it turns out that the strength with respect to tensile strength and pressure improves by providing a scrape.

  It should be noted that the assembly procedure shown in the above-described embodiment, or the shapes and combinations of the constituent members are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the embodiment described above, the pipe joint portion 20 has a configuration in which the inner layer portion 11 is exposed by peeling off the high weather resistant layer portion 12, but the present invention is not limited thereto. For example, the outer layer portion may not be originally provided at the end of the pipe, and the inner layer portion may be exposed.

  Moreover, although it is preferable to provide the convex part 22 in the piping junction part 20, the convex part 22 does not need to be provided.

  Furthermore, the high weathering layer part 12 can be scraped by adding a different pigment for each material constituting the inner layer part 11 and the high weathering layer part 12 so that the inner layer part 11 and the high weathering layer part 12 have different colors. It is possible to determine whether or not the pipe joint portion 20 is formed.

DESCRIPTION OF SYMBOLS 1 ... Piping 3 ... Joint 4 ... Adhesive layer 11 ... Inner layer part 12 ... High weather-resistant layer part (outer layer part)
20 ... Pipe joint 22 ... Convex part 31H ... Insertion hole (insertion part)
32H ... Communication hole L1 ... Length L2 along the axial direction of the pipe joint portion ... Length O along the axial direction of the insertion hole ... Axis S ... Scraper

Claims (5)

A pair of pipes having an inner layer portion formed in a tubular shape, and an outer layer portion provided integrally with the inner layer portion outside the inner layer portion and having higher weather resistance than the inner layer portion;
A pipe joint formed at an end of each of the pipes, wherein the outer layer part is not provided and the inner layer part is exposed;
A joint formed into a tubular shape, and each of the pipe joints inserted from both ends;
A pipe connection structure comprising: an adhesive layer provided between the pipe joint and the joint.   The pipe connection structure according to claim 1, wherein the pipe joint portion is configured such that the inner layer portion is exposed when the outer layer portion is peeled off.   3. The pipe according to claim 1, wherein a plurality of convex portions extending in a circumferential direction are formed on the surface of the pipe joint portion at intervals along the axial direction of the pipe. Connection structure. The both ends of the joint are formed with insertion portions into which the pipe joint is inserted,
The pipe connection structure according to any one of claims 1 to 3, wherein a length along the axial direction of the pipe joint portion is shorter than a length along the axial direction of the insertion portion. A pair of pipes having an inner layer part formed in a tubular shape and an outer layer part provided integrally with the inner layer part on the outside of the inner layer part and having higher weather resistance than the inner layer part are connected to each other through a joint. A pipe connection method,
A peeling step of peeling off the outer layer portion at the end of each pipe and exposing the inner layer portion;
A bonding step of applying an adhesive to each exposed inner layer part, inserting the exposed inner layer part of each pipe into both ends of a tubular joint, and joining the exposed inner layer part and the joint A method for connecting pipes, comprising:

Images