JP6825804B2 - Piping connection structure and connection method - Google Patents

Description

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

In general, buildings such as condominiums, apartments, and detached houses are equipped with rain gutters that guide rainwater to drainage pipes. Since the rain gutter is installed outdoors and exposed to ultraviolet rays, it is preferably formed of a material having high weather resistance. Therefore, as a pipe used for a rain gutter or the like, a pipe body formed in a tubular shape using a resin composition as a material and a resin composition provided integrally with the pipe body on the outside of the pipe body and having high weather resistance are formed. It has been proposed that the outer layer is provided (see, for example, Patent Document 1).

By the way, when the required length of the installed rain gutter or the like is longer than the length of the member (pipe), a plurality of pipes may be connected to each other via a joint. Adhesive is applied to the ends of each pipe, and the ends of each pipe are inserted into both ends of the joint. As a result, the ends of the pipes are joined to the ends of the joint, and the pipes are connected to each other via the joint and communicate with each other.

JP-A-2002-254576

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

Therefore, the present invention has been made in view of the above circumstances, and provides a pipe connection structure and a connection method capable of firmly joining weather-resistant pipes to each other.

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 provided integrally with the inner layer portion on the outside of the inner layer portion and having higher weather resistance than the inner layer portion. A pair of pipes to be held, a pipe joint formed at the end of each of the pipes, the inner layer is exposed without the outer layer, and a tubular shape, and all of the pipe joints are both ends. from the joint inserted respectively, and an adhesive layer provided between the joint and the pipe joint, the outer layer portion, includes at least one of an AES resin and AAS resin, wherein outer layer is characterized outermost layer der Rukoto of the pipe.
Further, a pair of pipes (however, an FRP composite pipe) having an inner layer portion formed in a tubular shape and an outer layer portion provided integrally with the inner layer portion on the outside of the inner layer portion and having higher weather resistance than the inner layer portion. ), Which is formed at the end of each of the pipes, and which is formed in a tubular shape with the pipe joint where the outer layer is not provided and the inner layer is exposed, and all of the pipe joints are formed from both ends. Each of the inserted joints and an adhesive layer provided between the pipe joint and the joint are provided, and the outer layer portion is the outermost layer of the pipe.

In the pipe connection structure configured in this way, pipe joints formed at the ends of each pipe and having an exposed inner layer are inserted at both ends of the joint. An adhesive layer is provided between the pipe joint and the joint. That is, since the inner layer portion having lower weather resistance than the outer layer portion is adhered to the joint via the adhesive layer, each pipe and the joint can be firmly joined.
Further, since the outer layer portion having higher weather resistance than the inner layer portion is provided in the portion other than the pipe joint portion in the pipe, the weather resistance of the pipe is ensured.

Further, 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 at the pipe joint). It has and is formed in plurality. 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 peeled off from the adhesive layer and is difficult to come off from the joint.

Further, in the pipe connection structure according to the present invention, the pipe is a pressure-feeding pipe for pumping drainage.
The result of the hot internal pressure creep water pressure test at 60 ° C. and 1.0 MPa may be 180 hours or more .
Further, in the connection structure of the pipe according to the present invention, the dye of the material constituting the inner layer portion and the dye of the material constituting the outer layer portion may be different.

In the pipe connection structure configured in this way, the length of the pipe joint along the axial direction is shorter than the length of the insertion portion along the axial direction. As a result, all the pipe joints are arranged inside the insertion portion and are not exposed to the outside of the joint. Therefore, since the portion of the pipe exposed from the joint is the outer layer portion having higher weather resistance than the inner layer portion, the weather resistance of the pipe is surely ensured.

Further, the method of connecting the pipes according to the present invention is a pair of pipes (however, FRP) having an inner layer portion formed in a tubular shape and an outer layer portion having higher weather resistance than the inner layer portion and provided in the outermost layer. It is a method of connecting pipes that connect each other ( excluding composite pipes) via a joint, and a peeling step of peeling off the outer layer portion at the end of each of the pipes to expose the inner layer portion and exposing the inner layer portion. A joining step in which an adhesive is applied to each of the inner layer portions, all of the exposed inner layer portions of each pipe are inserted into both ends of the tubular joint, and the exposed inner layer portion and the joint are joined. It is characterized by having.

In the pipe connection method configured in this way, the outer layer portion at the end of the pipe is peeled off to expose the inner layer portion in the peeling step. Further, in the joining step, an adhesive is applied to the exposed inner layer portion, the exposed inner layer portion of the pipe is inserted into both ends of the tubular joint, and the exposed inner layer portion and the joint are joined. Therefore, since the inner layer portion having lower weather resistance than the outer layer portion is adhered to the joint via the adhesive, each pipe and the joint can be firmly joined.
Further, since the outer layer portion having higher weather resistance than the inner layer portion is provided in the portion other than the portion joined with the joint in the pipe, the weather resistance of the pipe is ensured.

According to the pipe connection structure and 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 the pipe which concerns on one Embodiment of this invention. It is sectional drawing which shows the structure of the pipe to be joined by the connection structure of the pipe which concerns on one Embodiment of this invention. (A) is a sectional view taken along the line AA in FIG. 2, and FIG. 2B is a sectional view taken along the line BB in FIG. It is a figure for demonstrating the joining method of the pipe which concerns on one Embodiment of this invention, (a) the figure which shows the state before joining of the pipe, (b) the figure after executing the peeling step, (c) joining. It is a figure after executing a process. It is a figure for demonstrating the peeling process of the pipe joining method which concerns on one Embodiment of this invention.

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

As shown in FIG. 1, the pipe connection structure 100 includes a pair of pipes 1 and 1 and a joint 3 that connects the ends 1Z of the 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 highly weather resistant layer portion 12 (outer layer portion) provided integrally with the inner layer portion 11 so as to cover the outside of the inner layer portion 11.

As a material for forming the inner layer portion 11, for example, a hard vinyl chloride resin is adopted. The highly weather-resistant 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 highly weather resistant layer portion 12, for example, AES resin (acrylonitrile / ethylene-propylene-diene / styrene), AAS resin (acrylic nitrile acrylic nitrile rubber styrene), or the like is adopted, and these resins have weather resistance. A material to which, for example, carbon black or titanium oxide is added may be adopted. In the present embodiment, the thickness (diameter length) of the highly weather resistant layer portion 12 is 0.06 mm or more and 0.25 mm or less.

FIG. 2 is a front view showing the configuration of the pipe 1 joined by the connection structure 100 of the pipe 1. 3A is a sectional view taken along the line AA in FIG. 2, and FIG. 3B is a 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 1Z of each pipe 1. The pipe joint portion 20 is not provided with the highly weather resistant layer portion 12, and the inner layer portion 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 highly weather resistant 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 uneven shape is a pipe joint with the inclined wall portion 21A gradually outward in the circumferential direction toward the end (end of the pipe 1) 1Z side of the pipe joint 20 along the axis O direction. The inclined wall portions 21B gradually inward in the circumferential direction toward the end portion 1Z side of the portion 20 are alternately arranged along the axis O direction.

The portion where the radial outer end of the inclined wall portion 21A and the radial outer end of the inclined wall portion 21B intersect 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 has a through hole formed along the axis O direction and is formed in a tubular shape. Insertion holes 31H (insertion portions) penetrating along the axis O direction are formed at both ends of the joint 3. Further, a communication hole 32H (communication portion) for communicating the insertion holes 31H with each other is formed between the insertion holes 31H of the joint 3. A pipe joint 20 is inserted into the insertion hole 31H of the joint 3.

Further, the length L1 of the pipe joint 20 along the axis O direction is shorter than the length L2 of the insertion hole 31H along the axis O direction. A small portion of the end portion of the pipe joint portion 20 and the highly weather resistant layer portion 12 is inserted into the insertion hole 31H. In this way, all the pipe joints 20 are arranged inside the insertion hole 31H and are 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 be in contact with 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 20. In the present embodiment, as will be described in detail later, the adhesive layer 4 is composed of 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 shown above constitute the connection structure 100 of the pipe 1.

Next, a method of connecting the pipe 1 for connecting the pipes 1 and 1 using the pipe 1 and the joint 3 will be described mainly with reference to FIGS. 4 and 5.
FIG. 4 is a diagram for explaining a method of joining the pipe 1 according to the embodiment of the present invention, (a) a diagram showing a state before joining the pipe 1, and (b) after performing a peeling step. FIG. 3C is a diagram after executing the joining step. FIG. 5 is a diagram for explaining a peeling step of the joining method of the pipe 1 according to the embodiment of the present invention.

As shown in FIGS. 2 and 4A, it has an inner layer portion 11 formed in a tubular shape and a highly weather resistant layer portion 12 provided integrally with the inner layer portion 11 so as to cover the outside of the inner layer portion 11. Prepare a pair of pipes 1.

Next, a peeling step is performed.
As shown in FIGS. 4B and 5, a scraper S shaft S1 is inserted inside each pipe 1, and the shaft S1 supports the pipe 1. In this state, the cutting portion S2 of the scraper S is swiveled relative to the pipe 1 to peel off the highly weather resistant layer portion 12. The work of peeling off the highly weather-resistant layer portion 12 of the pipe 1 in this way is started from the end 1Z side of the pipe 1 and is performed for a length L1 along the axis O direction of the pipe 1. As a result, the highly weather-resistant 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. Will be done. This portion is referred to as a pipe joint portion 20.

The thickness of the pipe 1 to be cut may be equal to or greater than the thickness of the high weather resistant layer portion 12. In the present embodiment, the thickness of the highly weather resistant layer portion 12 is 0.06 mm or more and 0.25 mm or less, and the thickness of the pipe 1 to be peeled off is preferably 0.06 mm or more and 0.25 mm or less.

Next, the joining step is executed.
As shown in FIG. 4C, an adhesive is applied to the surface of the pipe joint portion 20 to insert the pipe joint portion 20 into the insertion hole 31H of the joint 3. When the adhesive is cured, an 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 in this way, pipe joints 20 formed at the ends 1Z of each pipe 1 and the inner layer 11 is exposed are inserted into both ends of the joint 3. An adhesive layer 4 is provided between the pipe joint 20 and the joint 3. That is, since the inner layer portion 11 having lower weather resistance than the high weather resistant layer portion 12 is adhered to the joint 3 via the adhesive layer 4, each pipe 1 and the joint 3 can be firmly joined. Therefore, the pipe 1 can be used as a pumping pipe.
Further, since the high weather resistant layer portion 12 having higher weather resistance than the inner layer portion 11 is provided in the portion of the pipe 1 other than the pipe joint portion 20, the weather resistance of the pipe 1 is ensured.

Further, the pipe joint portion 20 in which the inner layer portion 11 is exposed is formed by peeling off the highly weather resistant layer portion 12. That is, the pipe joint 20 can be formed by peeling off the high weather resistant layer portion 12 of the end 1Z of the general pipe 1 having the inner layer portion 11 and the high weather resistant layer portion 12. Therefore, since the general pipe 1 can be adopted, the versatility is high and the cost can be suppressed.

Further, on the surface of the pipe joint portion 20 (the surface of the exposed inner layer portion 11 in the pipe joint portion 20), a plurality of convex portions 22 extending in the circumferential direction are formed at intervals along the axis O direction of the pipe 1. Has been done. 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 does not peel off from the adhesive layer 4 and come off from the joint 3. .. 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 on the inner peripheral surface of the joint 3, and the surface of the pipe 1 and the inner circumference of the joint 3 are caught. Since a large frictional force is generated between the pipe 1 and the surface, the pipe 1 does not come off from the joint 3.

Further, the length L1 of the pipe joint 20 along the axis O direction is shorter than the length L2 of the insertion hole 31H along the axis O direction. As a result, all the pipe joints 20 are arranged inside the insertion hole 31H and are not exposed to the outside of the joint 3. Therefore, the portion of the pipe 1 exposed from the joint 3 is a high weather resistant layer portion 12 having higher weather resistance than the inner layer portion 11, so that the weather resistance of the pipe 1 is surely ensured.

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

As shown in Table 1, in Comparative Example 1, the pipe has an inner layer portion but does not have a high weather resistant layer (high weather resistant layer portion). In Comparative Examples 2 and 3 and Examples 1 and 2, the pipe has an inner layer portion and a highly weather resistant layer.
As the adhesive, in Comparative Examples 1 and 3 and Example 2, an adhesive for rigid vinyl chloride pipes containing acetone, methyl ethyl ketone, cyclohexanone and the like as main components (Eslon adhesive (registered trademark) No. 73S) is used. In Comparative Examples 2 and 1, an adhesive for rigid vinyl chloride tubes (Eslon adhesive (registered trademark) No. 100S) containing tetrahydrofuran, methyl ethyl ketone, cyclohexanone and the like as main components is used. Eslon adhesive No. 100S uses tetrahydrofuran having 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.

Tensile tests and long-term hydraulic fracturing tests (creep tests) were carried out for Examples 1, 2 and Comparative Examples 1, 2 and 3, respectively.
In the tensile test, the joint between the joined pipe and the socket (joint) is cut out in a dumbbell shape. The test sample shall be a strip-shaped dumbbell with a width of 10 mm cut by adhesively joining a 50A pipe and a socket. Then, under the conditions of 60 ° C. and a tensile speed of 5 mm / min, the force required to be pulled from both ends to be broken was measured.
In the long-term hydraulic fracturing test (hot internal pressure creep hydraulic pressure test), a test piece in which a 50A pipe and a TS socket were adhesively bonded was used, a pressure of 1.0 MPa was applied to the inside of the pipe at 60 ° C., and the withstand time was measured. ..

As shown in Table 1, Example 2 has a common adhesive used as compared with Comparative Example 1, but differs in that it has a highly weather resistant layer and has a scrape. In the experimental results of Example 2 and Comparative Example 1, the measured value of Example 2 was higher than that of Comparative Example 1 in the tensile strength test. Therefore, it can be seen that the tensile strength is improved by providing the high weather resistant layer and the scrape.
Example 1 has in common that it has an adhesive used and a highly weather resistant layer as compared with Comparative Example 2, but differs in that it has a scrape. In the experimental results of Example 1 and Comparative Example 2, the measured values of Example 1 were higher than those of Comparative Example 2 in the tensile strength test and the long-term hydraulic fracturing test. Therefore, it can be seen that the tensile strength and the strength against pressure are improved by providing the scrape.
Similarly, Example 2 has in common that it has the adhesive used and a highly weather resistant layer as compared to Comparative Example 3, but differs in that it has a scrape. In the experimental results of Example 2 and Comparative Example 3, the measured values of Example 2 were higher than those of Comparative Example 3 in the tensile strength test and the long-term hydraulic fracturing test. Therefore, it can be seen that the tensile strength and the strength against pressure are improved by providing the scrape.

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

For example, in the embodiment shown 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 to this. 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.

Further, it is preferable that the pipe joint portion 20 is provided with a plurality of convex portions 22, but the convex portions 22 may not be provided.

Further, the high weather resistant layer portion 12 can be scraped by adding different dyes for each material constituting the inner layer portion 11 and the high weather resistant layer portion 12 to make the inner layer portion 11 and the high weather resistant layer portion 12 different colors. It can be determined whether or not (whether or not the pipe joint portion 20 is formed).

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

Claims (5)

A pair of pipes (excluding FRP composite pipes) having an inner layer portion formed in a tubular shape and an outer layer portion provided integrally with the inner layer portion on the outside of the inner layer portion and having higher weather resistance than the inner layer portion. )When,
A pipe joint formed at the end of each of the pipes, the outer layer portion is not provided, and the inner layer portion is exposed.
A joint formed in a tubular shape and all of the pipe joints inserted from both ends,
An adhesive layer provided between the pipe joint and the joint is provided.
The outer layer portion is a pipe connection structure, which is the outermost layer of the pipe. Wherein the surface of the pipe joint, a convex portion extending in a circumferential direction, of the pipe according to claim 1, characterized in that formed with a plurality at a distance in the axial direction of the pipe connecting structure .. The pipe is a pressure-feeding pipe for pumping drainage.
The pipe connection structure according to claim 1 or 2 , wherein the result of the hot internal pressure creep water pressure test at 60 ° C. and 1.0 MPa is 180 hours or more. The pipe connection structure according to any one of claims 1 to 3 , wherein the dye of the material constituting the inner layer portion and the dye of the material constituting the outer layer portion are different. An inner layer portion formed in the tubular, integrally provided with the inner layer portion on the outer side of the inner layer portion, a pair of pipes having a high weather resistance, the outer layer portion provided in the outermost layer than the inner layer ( However, it is a method of connecting pipes that connect each other ( excluding FRP composite pipes) via joints.
A peeling step of peeling the outer layer portion at the end of each of the pipes using a scraper to expose the inner layer portion.
Adhesive is applied to each exposed inner layer portion, all of the exposed inner layer portions of each pipe are inserted into both ends of the tubular joint, and the exposed inner layer portion and the joint are joined. A method of connecting pipes, which comprises a joining process.

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