JP2017120093A - Resin composite pipe, pipeline system, and installation method of pipeline system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composite pipe which enables an adhesive layer to be securely scraped and prevents an outer layer from being excessively scraped to enable fusion to be securely conducted.SOLUTION: A resin composite pipe 1 in which a fluid may flow includes: an inner layer 2 forming a hollow part in which the fluid flows; an intermediate layer 3 formed outside the inner layer 2 and having a heat expansion ratio smaller than that of the inner layer 2; an outer layer 4 formed outside the intermediate layer 3 so as to be thermally fused; an oxygen barrier layer 6 formed outside the outer layer 4 and having an oxygen barrier property; and an adhesive layer 5 formed between the outer layer 4 and the oxygen barrier layer 6 to bond the outer layer 4 to the oxygen barrier layer 6. The outer layer 4 is adapted to have a color different from those of the adhesive layer 5 and the intermediate layer 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin composite pipe, a piping system, and a construction method thereof.

  A multi-layered resin composite pipe having an inner layer, an intermediate layer, and an outer layer in order from the inside is known (for example, see Patent Document 1).

JP 2001-335767 A

  When using a resin composite pipe as described above, for example, in a cold / hot water pipe in which a liquid such as cold water or hot water is passed instead of a conventional metal pipe, the resin composite pipe is placed outside the resin composite pipe. It is necessary to provide an oxygen barrier layer for preventing oxidation of metal parts connected to the tube. When the outer layer of the resin composite tube is made of a material that cannot directly form the oxygen barrier layer, it is necessary to further provide an adhesive layer as a medium between the outer layer and the oxygen barrier layer.

  Then, in order to construct a resin composite pipe provided with an adhesive layer and an oxygen barrier layer, an attempt was made to fuse the resin composite pipes using an electric fusion joint (EF joint: EF is Electric Fusion). Occasionally, the oxygen barrier layer and adhesive layer need to be peeled away to expose the outer layer portion (suitable for fusion).

  However, if the boundary between the adhesive layer and the outer layer, or the boundary between the outer layer and the intermediate layer is not clear, the amount of the adhesive layer is insufficient and the adhesive layer remains, or conversely, the outer layer is excessively shaved. If the intermediate layer is exposed, the fusion may not be performed well.

  Accordingly, the main object of the present invention is to solve the above-described problems.

In order to solve the above problems, the present invention provides:
A resin composite tube that allows liquid to flow inside,
An inner layer constituting a hollow portion through which liquid flows;
An intermediate layer that is configured outside the inner layer and has a smaller thermal expansion / contraction rate than the inner layer,
An outer layer configured outside the intermediate layer and configured to be heat-sealable;
An oxygen barrier layer that is configured outside the outer layer and has an oxygen barrier property;
An adhesive layer configured between the outer layer and the oxygen barrier layer, the adhesive layer bonding the outer layer and the oxygen barrier layer; and
The outer layer has a color different from that of the adhesive layer and the intermediate layer.

  According to the present invention, the above configuration makes it possible to surely cut the adhesive layer and to prevent the outer layer from being excessively cut, and to ensure the fusion.

It is an end view of the resin compound pipe concerning an example. FIG. 2 is a partially broken perspective view of the resin composite pipe in FIG. 1. It is a longitudinal cross-sectional view which shows the state which fuse | melts resin composite pipes.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 3 are for explaining this embodiment.

  <Configuration> The configuration will be described below.

As shown in FIGS. 1 and 2, the resin composite pipe 1 of this embodiment is configured such that a liquid can flow therethrough.
The resin composite tube 1 includes an inner layer 2 that constitutes a hollow portion through which a liquid flows, an intermediate layer 3 that is configured outside the inner layer 2 and has a smaller thermal expansion / contraction rate than the inner layer 2, and an outer side than the intermediate layer 3 The outer layer 4 configured to be capable of heat-sealing, the oxygen barrier layer 6 having an oxygen barrier property that is configured outside the outer layer 4, and the outer layer 4 and the oxygen barrier layer 6. An adhesive layer 5 for bonding the outer layer 4 and the oxygen barrier layer 6 to each other.

  Here, the resin composite pipe 1 is a polypropylene composite pipe, a polyethylene composite pipe, or the like. The resin composite tube 1 can be used as a cold / hot water pipe through which a liquid such as cold water or hot water passes. This cold / hot water pipe is used, for example, for a hot water supply pipe of a hot water supply facility, a cold / hot water type air conditioning facility, or the like.

  When the resin composite tube 1 is a polypropylene composite tube, polypropylene is used as the material of the inner layer 2 and the outer layer 4. When the resin composite tube 1 is a polyethylene composite tube, polyethylene is used as the material for the inner layer 2 and the outer layer 4.

  The intermediate layer 3 is a fiber reinforced layer for suppressing thermal expansion and contraction to about half. Examples of the fiber reinforced layer include resins such as polyethylene and polypropylene containing glass fiber and carbon fiber. The ratio of the thickness of the intermediate layer 3 to the total thickness of the inner layer 2 and the outer layer 4 is 0.3 or more and 0.8 or less. By increasing the thickness of the intermediate layer 3 relative to the entire thickness of the resin composite tube 1, the reliability (strength, dimensional stability, workability, etc.) of the resin composite tube 1 can be increased. The intermediate layer 3 has a glass fiber content of 15 wt% or more and 45 wt% or less.

  In addition, it is preferable that resin used for the inner layer 2, the intermediate | middle layer 3, and the outer layer 4 contains the same resin material.

  The adhesive layer 5 may be anything as long as it can adhere the polyethylene or polypropylene constituting the outer layer 4 and the ethylene vinyl alcohol copolymer (EVOH) constituting the oxygen barrier layer 6, for example, maleic anhydride, graph, and polyolefin. An adhesive resin or the like can be used.

  The oxygen barrier layer 6 is intended to prevent rusting of an internal pipe (metal pipe) of an air conditioner connected to the cold / hot water pipe by preventing permeation of oxygen. Examples of the oxygen barrier layer 6 include the above-described ethylene vinyl alcohol copolymer (EVOH) resin and aluminum.

  As shown in FIG. 3, the resin composite pipes 1 are fused together or the resin composite pipe 1 and other resin pipes are fused together with a joint (electric heat fusion joint 11) having an electric heat fusion mechanism. ) Is used.

  The electric heat fusion joint 11 is fixed in a state where the resin constituting the electric heat fusion joint 11 is softened and melted by heat and fused with a resin pipe (resin composite pipe 1 or the like) (or the structure is fused). ). The electrothermal fusion joint 11 is buried in the vicinity of the inner surface of a tubular joint body 12 made of the same resin as the pipe to be fused (in the case of the resin composite pipe 1, the outer layer 4 of the resin composite pipe 1). And a terminal portion 14 for supplying power to the heating coil 13 on the outer surface. In addition, the joint body 12 is provided with an indicator 15 or the like that makes it possible to visually check the end of the fusion.

  The electric heat fusion joint 11 cuts the surface (the oxygen barrier layer 6 and the adhesive layer 5) in advance by energizing the terminal portion 14 in a state of being externally fitted to the resin composite tube 1 and heating the heating coil 13. The resin composite tube 1 (the outer layer 4) is integrated by heat fusion.

  In addition to the basic or overall configuration as described above, this embodiment has the following configuration.

  That is, in the resin composite tube 1, the outer layer 4 has a color different from that of the adhesive layer 5 and the intermediate layer 3.

  Here, the outer layer 4 may have any color as long as it has different colors with respect to the adhesive layer 5 and the intermediate layer 3, but is preferably as follows.

That is, in the resin composite tube 1, at least one of the intermediate layer 3, the outer layer 4, and the adhesive layer 5 has the layer identifying means 21.
The layer identifying means 21 is a colored layer 21a, 21b, 21c (layer or colored layer) that can be identified by color (difference or the like).

  In order to become the layer identifying means 21, it is necessary that the intermediate layer 3 and the outer layer 4 and the outer layer 4 and the adhesive layer 5 have colors that can be distinguished from each other at a glance from the outside. In this case, for example, the inner layer 2 and the outer layer 4 are colored so as to appear as a blue layer, and the intermediate layer 3 is colored as a white layer. The adhesive layer 5 is colored so that it looks like a green layer (yellowish green layer) or a purple layer. The oxygen barrier layer 6 is colorless and transparent.

  However, these colors are not limited to the above. The oxygen barrier layer 6 can also be colored.

  As a material for making it appear colored, inorganic or organic dyes and pigments, the above-described glass fibers, carbon fibers, and the like can be used. For example, colors such as blue, green (yellowish green), and purple of the inner layer 2, the outer layer 4, and the adhesive layer 5 can be applied by mixing a pigment into the resin material constituting each layer. The intermediate layer 3 is made to appear white by mixing glass fibers colored in white. In addition, it is preferable to make each layer appear to be colored as a whole, but it is only necessary to make only a part of the layers other than the outer layer 4 appear to be colored.

  <Functional Effects> The operational effects of this embodiment will be described below.

  The resin composite tube 1 is one in which cold / hot water flows through the inside of the inner layer 2.

  At this time, thermal expansion and contraction of the resin composite pipe 1 due to the flow of cold / hot water therein is suppressed by the intermediate layer 3.

  The outer layer 4 is for enabling the resin composite tube 1 to be fused.

  The adhesive layer 5 is provided so that the oxygen barrier layer 6 can be fixed (adhered) to the outer layer 4.

  Furthermore, the oxygen barrier layer 6 functions to prevent oxidation of metal parts and the like connected to the resin composite tube 1.

In such a cold / hot water pipe, when fusing to the cold / hot water pipe, the outer layer 4 is used with a tool (not shown).
The oxygen barrier layer 6 and the adhesive layer 5 are peeled off or scraped (cut) until they are exposed on the surface (cutting process).

  At this time, in the resin composite tube 1, the outer layer 4 has a color different from that of the adhesive layer 5 and the intermediate layer 3. For example, the intermediate layer 3, the outer layer 4, and the adhesive layer 5 are provided with the layer identifying means 21 so that the color of the adhesive layer 5 (colored layer 21 c) and the outer layer 4 (colored layer 21 b) is different by the layer identifying means 21. I made it. As a result, it can be clearly recognized that the color of the outer layer 4 appears that the adhesive layer 5 is completely scraped and the outer layer 4 is exposed. Therefore, it is possible to accurately know the end time of the scraping processing of the adhesive layer 5 and to prevent the uncut portion of the adhesive layer 5 from being left, thereby preventing the occurrence of poor fusion.

  In addition, since the outer layer 4 (colored layer 21b) and the intermediate layer 3 (colored layer 21a) are different in color by the layer identifying means 21, the outer layer 4 is excessively shaved and the intermediate layer 3 is exposed. It can be clearly recognized by the appearance of color. Therefore, it is possible to prevent the outer layer 4 from being excessively shaved and to prevent occurrence of poor fusion. This is particularly important when the thickness of the intermediate layer 3 with respect to the entire thickness of the resin composite tube 1 is increased so that the reliability as the resin composite tube 1 is increased, and the layer identification means 21 is provided. Thus, even when the thickness of the intermediate layer 3 is increased, it is possible to reliably prevent the outer layer 4 from being excessively shaved.

  Next, the end portion of the resin composite pipe 1 where the outer layer 4 is exposed is fitted into a joint (electrical heat fusion joint 11), and the gap between the outer layer 4 and the inner surface of the joint (electrical heat fusion joint 11). Fusing (fusion process). Thereby, the resin composite pipe 1 and the joint (electric heat fusion joint 11) can be reliably fused.

  As mentioned above, although embodiment of this invention has been explained in full detail with drawing, embodiment is only an illustration of this invention. Therefore, the present invention is not limited only to the configuration of the embodiment, and it goes without saying that design changes and the like within a scope not departing from the gist of the present invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. In addition, in the case where a plurality of examples and modifications are disclosed in the embodiment as those of the present invention, possible combinations of combinations extending over these are included even if not specifically described. Of course. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

DESCRIPTION OF SYMBOLS 1 Resin composite pipe 2 Inner layer 3 Intermediate layer 4 Outer layer 5 Adhesive layer 6 Oxygen barrier layer 21 Layer identification means 21a Colored layer 21b Colored layer 21c Colored layer

Claims (5)

A resin composite tube that allows liquid to flow inside,
An inner layer constituting a hollow portion through which liquid flows;
An intermediate layer that is configured outside the inner layer and has a smaller thermal expansion / contraction rate than the inner layer,
An outer layer configured outside the intermediate layer and configured to be heat-sealable;
An oxygen barrier layer that is configured outside the outer layer and has an oxygen barrier property;
An adhesive layer configured between the outer layer and the oxygen barrier layer, the adhesive layer bonding the outer layer and the oxygen barrier layer; and
The resin composite pipe, wherein the outer layer has a color different from that of the adhesive layer and the intermediate layer. In the resin composite pipe according to claim 1,
The resin composite pipe, wherein a ratio of the thickness of the intermediate layer to the total thickness of the inner layer and the outer layer is 0.3 or more and 0.8 or less. In the resin composite pipe according to claim 1 or 2,
The intermediate layer has a glass fiber content of 15 wt% or more and 45 wt% or less. In a piping system consisting of a resin composite pipe and a resin joint,
The resin composite tube is
An inner layer constituting a hollow portion through which liquid flows;
An intermediate layer that is configured outside the inner layer and has a smaller thermal expansion / contraction rate than the inner layer,
An outer layer configured outside the intermediate layer and configured to be heat-sealable;
An oxygen barrier layer that is configured outside the outer layer and has an oxygen barrier property;
Constituted between the outer layer and the oxygen barrier layer;
An adhesive layer for bonding the outer layer and the oxygen barrier layer,
The outer layer has a different color from the adhesive layer and the intermediate layer;
The piping system, wherein the resin joint is fused to the outer layer of the resin composite pipe on the inner surface of the resin joint. In the construction method of the piping system that fuses the resin composite pipe and the resin joint,
The resin composite tube is
An inner layer constituting a hollow portion through which liquid flows;
An intermediate layer that is configured outside the inner layer and has a smaller thermal expansion / contraction rate than the inner layer,
An outer layer configured outside the intermediate layer and configured to be heat-sealable;
An oxygen barrier layer that is configured outside the outer layer and has an oxygen barrier property;
Constituted between the outer layer and the oxygen barrier layer;
An adhesive layer for bonding the outer layer and the oxygen barrier layer,
The outer layer has a different color from the adhesive layer and the intermediate layer;
The resin joint is configured to be capable of being fused with the outer layer of the resin composite pipe on the inner surface of the resin joint,
A cutting step of cutting the oxygen barrier layer and the adhesive layer in the resin composite pipe until the outer layer is exposed on the surface; a fusing step of fusing the outer layer and the inner surface of the joint;
The construction method of the piping system characterized by including.