JP2012051109A - Laminated tube and connection structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe made of fiber-reinforced resin that eliminates the need for reinforcement of nonstandard component like a rubber ring or connection when connecting between a pipe made of fiber-reinforced resin, and another pipe and flanged short pipe, and has superior workability, and to provide its connection structure.SOLUTION: A laminated tube 1 containing a fiber-reinforced resin layer includes: an outer pipe 2 which is implemented primer treatment to an inside surface made of rigid polyvinyl chloride resin which is thermoplastic resin (hereinafter referred to PVC) to inside from outside; and an inner tube 4 made of glass fiber reinforcement vinyl ester resin of which outer surface is applied with curable resin 3 of which principal component is vinyl ester resin.

Description

The present invention relates to a laminated pipe having a fiber-reinforced resin pipe suitably used for piping lines for chemical factories, water and sewage systems, agriculture and fisheries, and a connection structure thereof.

Conventionally, when another pipe or a flanged short pipe is connected to a fiber reinforced resin pipe, generally, the pipe end 102 of the pipe 101 and the flanged short pipe 103 are short as shown in FIG. It arrange | positions so that the pipe part 104 may be faced | matched, the fiber reinforced resin layer 106 is formed in the outer periphery of the pipe end part 102 and the short pipe part 104 of the both sides of the butt | matching part 105 by hand layup, and the pipe | tube 101 and the short pipe 103 with a flange. Is connected.

However, in such a connection structure in which the fiber reinforced resin layer 106 is formed in the butt portion 105, the construction requires much time, and the strength of the connection portion is often inferior to that of the pipe portion 107 and the flange portion 108. When the piping of the fiber reinforced resin piping member is performed, there is a possibility that the connection portion is damaged due to the stress applied to the pipeline.

Patent Document 1 discloses a connection structure that solves the problems of the conventional fiber reinforced resin pipe connection structure. As shown in FIG. 7, the pipe end 202 of the fiber reinforced resin pipe 201 and the short pipe part 204 of the flanged short pipe 203 are abutted, and the pipe end 202 and the short pipe on both sides of the abutting part 205 are abutted. A rubber ring 206 is provided so as to cover the portion 204, and a fiber reinforced resin layer 207 is provided outside the rubber ring 206. The effect is that the connection portion is less likely to break the stress applied to the pipe line, and there is little possibility of causing water leakage or the like.

JP 2001-205707 A

However, the conventional fiber reinforced resin pipe connection structure using the rubber ring 206 is connected to the rubber ring 206, the fiber reinforced resin pipe 201, and the flanged short pipe 203 to connect one joint. Are required, and a process of providing a fiber reinforced resin layer 207 for reinforcement on the outer peripheral surface of the rubber ring 206 is required. For this reason, there is a problem that a special part such as a rubber ring 206 is required for the construction, and the type and amount of tools and auxiliary materials necessary for the construction are increased, and the construction takes a lot of time.

Further, in order to facilitate insertion of the fiber-reinforced resin pipe 201 and the flanged short pipe 203 into the rubber ring 206, the pipe end portion 202 of the pipe 201 and the short pipe portion 204 of the flanged short pipe 203 are made thin. Need to be ground. Further, in order to increase the adhesive force between the tube 201 and the flanged short tube 203 and the rubber ring 206, the inner peripheral surface of the rubber ring 206 needs to be surface-treated with hypochlorous acid or sulfuric acid. For this reason, there has been a problem that preprocessing takes time and effort.

Further, in order to increase the strength of the connection portion, the fiber reinforced resin layer 207 is formed by alternately laminating glass rovings, glass mats, and glass roving cloths impregnated with resin on the outer peripheral surface of the rubber ring 206 by a hand lay-up method or the like. Since it is necessary to provide the connection portion, it takes time and labor to reinforce the connection portion, and it requires skill for the installer, resulting in variations in strength depending on the installer.

In addition, the bonded portion between the fiber reinforced resin pipe 201 and the flanged short pipe 203 and the rubber ring 206 is merely mechanically bonding different materials, and the same material is melted and integrated with an adhesive. In general, since the adhesive strength is inferior, there is a problem in that it is unreliable and unsuitable for use conditions where temperature and pressure are applied. Furthermore, since the adhesive strength varies greatly depending on the amount of adhesive applied and the degree of surface treatment of the inner peripheral surface of the rubber ring 206, there is a problem that the installer needs skill to achieve proper bonding.

  The present invention has been made in view of the above-described problems. When connecting a fiber reinforced resin pipe to another pipe or a flanged short pipe, special parts such as rubber rings and reinforcement of the connection portion are provided. Therefore, the present invention provides a fiber-reinforced resin pipe excellent in workability and its connection structure.

The laminated tube of the present invention and the connection structure thereof for solving the above problems will be described. In the laminated tube including a resin layer, the inner tube made of fiber reinforced resin in which a curable resin is applied to the outer surface is made of a thermoplastic resin. The first feature is that it is formed by being inserted and bonded to the outer tube.

A second feature is that the dimensional difference between the inner diameter of the outer tube and the outer diameter of the inner tube is 0.3 to 1.0 mm.

A third characteristic is that the viscosity of the curable resin is 0.2 to 2 Pa · s.

A fourth feature is that the material of the outer tube is an amorphous resin.

A fifth feature is that the material of the inner tube is a glass fiber reinforced polyvinyl ester resin, and the material of the outer tube is a hard polyvinyl chloride resin.

A sixth feature is that the curable resin contains a polyvinyl ester resin as a main component.

A seventh embodiment is such that an end portion of the laminated tube is inserted and connected to a receiving port of a pipe joint in which an inner peripheral surface is formed of the thermoplastic resin and an outer peripheral surface is formed of the fiber reinforced resin. It is characterized by.

An eighth feature is that an end face of the insertion portion of the laminated tube is covered with the same resin as the resin component of the inner tube.

In the present invention, the curable resin fills a gap between the inner tube and the outer tube and bonds and fixes the inner tube and the outer tube. When the inner tube is inserted into the outer tube, the curable resin is applied in a liquid state on the outer surface of the inner tube, and the material of the resin is not particularly limited as long as it is cured after insertion and the outer tube and the inner tube can be bonded and fixed. . For example, an adhesive such as an epoxy-based adhesive or an acrylic-based adhesive may be used to bond and fix the inner tube and the outer tube alone, and thermosetting such as unsaturated polyester resin, vinyl ester resin, epoxy resin, etc. An inner tube and an outer tube may be bonded and fixed by combining a primer like a resin.

The present invention is configured as described above, and the following excellent effects are obtained.
(1) The laminated tube made of fiber reinforced resin has an outer tube of thermoplastic resin in the outer layer, so it can be easily connected by bonding or fusion using a joint, and therefore, the workability is extremely good, Stable connection strength can be maintained because no skilled person is required.
(2) Since the piping members can be integrated and connected by melting with an adhesive or heat fusion, the strength of the connecting portion can be the same as that of the pipe portion of the fiber reinforced resin piping member. .
(3) Since it is not necessary to reinforce the connection portion with fiber reinforced resin, the number of man-hours can be reduced, and the construction period and construction costs can be reduced.
(4) There is no need to prepare special parts, auxiliary materials, and equipment, especially when connecting piping members with an adhesive.

It is a longitudinal cross-sectional view which shows the laminated tube of this invention. It is a longitudinal cross-sectional view which shows the outer tube | pipe and inner tube | pipe of the laminated tube of this invention. It is a longitudinal cross-sectional view which shows the laminated pipe and reinforcement joint of this invention. It is a longitudinal cross-sectional view which shows the connection structure of this invention. It is another longitudinal cross-sectional view which shows the connection structure of this invention. It is a longitudinal cross-sectional view which shows the connection structure of the conventional fiber reinforced resin pipes. It is another longitudinal cross-sectional view which shows the connection structure of the conventional fiber reinforced resin pipes.

Hereinafter, although an embodiment of the present invention is described with reference to drawings, it cannot be overemphasized that the present invention is not limited to this embodiment.

In FIG. 1, a laminated tube 1 is an outer tube 2 in which a primer treatment is applied to an inner peripheral surface made of hard polyvinyl chloride resin (hereinafter referred to as PVC) from the outside to the inside, and a curability mainly composed of vinyl ester resin. The inner tube 4 is made of a resin 3 and a glass fiber reinforced vinyl ester resin.

In this embodiment, a glass fiber reinforced vinyl ester resin is cited as the material of the inner tube 4, but there is no particular limitation as long as the fiber reinforced resin satisfies the strength required as a piping material. , Thermosetting resins such as vinyl ester resins and epoxy resins, and inorganic fibers such as glass fibers, carbon fibers and boron fibers; long fibers of organic fibers such as drawn polyolefin fibers, nylon fibers, polyester fibers and aramid fibers; Examples thereof include those in which short fibers are combined. Further, the inner peripheral surface and the outer peripheral surface of the inner pipe 4 may be subjected to surface treatment such as corrosion resistance treatment, weather resistance treatment, antifouling treatment, primer treatment and the like.

In this embodiment, PVC is used as the material of the outer tube 2, but it is not particularly limited as long as it is a thermoplastic resin. PVC, acrylonitrile butadiene styrene copolymer, polystyrene resin, polycarbonate resin, polyphenyl sal Examples thereof include amorphous resins such as phon resin, and crystalline resins such as polypropylene resin, polyethylene resin, and polyvinylidene fluoride resin. In particular, an amorphous resin that can melt and integrate the connecting portion with an adhesive is preferable, and among them, PVC that is inexpensive and excellent in versatility is more preferable. Further, the inner peripheral surface and outer peripheral surface of the outer tube 2 may be subjected to surface treatment such as corrosion resistance treatment, weather resistance treatment, antifouling treatment, primer treatment and the like.

In this embodiment, the curable resin 3 uses a vinyl ester resin as a base material and is mixed with a filler, a curing agent, and an accelerator. The resin used as the base material may be an unsaturated polyester resin or epoxy resin, and is not particularly limited. However, when the same thermosetting resin as the main component of the inner tube 4 made of fiber reinforced resin is used, it is curable. It is preferable because the resin 3 and the inner tube 4 are easily compatible. In particular, the combination of the PVC outer tube 2 with a primer treatment on the inner peripheral surface, the curable resin 3 based on vinyl ester resin, and the inner tube 4 made of glass fiber reinforced vinyl ester resin is chemical resistant and Not only is it excellent in versatility, but it is suitable because it has excellent adhesion between the outer tube 2 and the inner tube 4.

Next, a method for manufacturing the laminated tube 1 will be described with reference to FIGS. First, a primer is applied to the end surface of the inner tube 4 made of glass fiber-reinforced vinyl ester resin having an outer diameter of 106.5 mm and a wall thickness of 4 mm, and to the outer peripheral surface of the end portion of the outer tube 2 made of PVC having an inner diameter of 107 mm and a wall thickness of 3.5 mm. A masking process (not shown) is performed so as not to get dirty with the curable resin 3. Next, the inner peripheral surface of the outer tube 2 is subjected to primer treatment, and a liquid curable resin 3 mainly composed of vinyl ester resin is applied uniformly. Thereafter, the inner tube 4 is inserted into the outer tube 2 while uniformly applying the liquid curable resin 3 mainly composed of vinyl ester resin to the outer peripheral surface of the inner tube 4. At this time, the insertion speed of the inner tube 4 is kept constant and at least one of the inner tube 4 and the outer tube 2 is rotated, or both the inner tube 4 and the outer tube 2 are rotated in opposite directions. When inserted, the applied curable resin 3 can be evenly applied to the outer surface of the inner tube 4 without unevenness, and generation of voids inside the curable resin 3 is prevented to form a uniform thick layer. be able to. Further, if the length of the inner tube 4 is made slightly longer than the length of the outer tube 2, workability is improved because a grip portion when the inner tube 4 is inserted into the outer tube 2 can be secured. Then, the lengths of the end surfaces of the inner tube 4 and the outer tube 2 are aligned, the masking is removed, and the curable resin 3 is sufficiently dried.

In the present invention, the dimensional difference between the outer diameter of the inner tube 4 and the inner diameter of the outer tube 2 is preferably 0.3 to 1.0 mm. This is preferably 0.3 mm or more in order to smoothly insert the inner tube 4 into the outer tube 2 via the curable resin 3 on the surface of the inner tube 4, and the curable resin 3 consists of the outer tube 2 and the inner tube 4. 1 mm or less is preferable in order to obtain a uniform distribution without being biased between them and to prevent the formation of voids inside the curable resin 3.

In the present invention, the viscosity of the curable resin 3 is preferably 0.2 to 2 Pa · s. This prevents the uncured curable resin 3 from drooping downward, plays a role of a sliding material when inserted between the outer tube 2 and the inner tube 4, and at the same time distributes the curable resin 3 to a certain thickness. In order to make the thickness uniform, 0.2 Pa · s or more is good, and in applying the uncured curable resin 3, 2 Pa · s or less is good in order to apply the curable resin 3 thinly and uniformly.

Next, a method for connecting the laminated tubes 1 will be described with reference to FIGS. The reinforcing joint 5 is a socket-shaped joint in which a fiber reinforced resin layer 7 made of glass fiber reinforced vinyl ester resin is integrally formed on the outside of a PVC socket-shaped joint 6 having an outer diameter of 130 mm. The receiving port 8 is provided at both ends of the joint 6, and the inner diameter of the end of the receiving port 8 is 114.7 mm, and is provided so as to be reduced in diameter by a taper of 0.0178 ° inclined toward the back. It has been.

First, the laminated tube 1 is cut to a required length, and the end of the cut-out portion 9 of the cut laminated tube 1 is chamfered so that there are no burrs or burrs around the inner and outer surfaces using a file or a chamfering device. At the same time, the same resin 10 as the resin portion of the inner tube 4 is applied to the end face of the differential port 9 to cover the boundary between the outer tube 2 and the inner tube 4. By covering the boundary between the outer tube 2 and the inner tube 4, fluid can be prevented from entering the interface between the outer tube 2 and the inner tube 4, and the outer tube 2 and the inner tube 4 can be prevented from peeling off. The strength of the laminated tube 1 can be maintained.

Next, the inner surface of one receiving portion 8 of the reinforcing joint 5 and the outer surface of the outlet portion 9 of the laminated tube 1 are wiped, and an appropriate amount is applied to the inner surface of the receiving portion 8 of the reinforcing joint 5 and the outer surface of the outlet portion 9 of the laminated tube 1. The adhesive is uniformly applied, and the outlet portion 9 of the laminated tube 1 is inserted into the receiving portion 8 of the reinforcing joint 5, and the inserted state is maintained for a predetermined time and the adhesive protruding from the connecting portion is immediately wiped off. Then, another laminated tube 1 is inserted and connected to the other receiving port 8 in the same manner. After bonding, the organic solvent vapor in the adhesive is removed by sufficient drying and washing.

In the present embodiment, the reinforcing joint 5 in which the fiber reinforced resin layer 7 is provided outside the joint 6 made of PVC is used, but the material of the joint 6 is the outer pipe 2 of the laminated pipe 1 whose inner periphery is the receiving portion 8. If it is the same material as, there is no problem. Further, the fiber reinforced resin layer 7 is not necessarily required under mild use conditions where temperature and pressure are not so much. For example, only a joint made of PVC may be used. In addition, it is desirable to provide the fiber reinforced resin layer 7 on the outer peripheral surface of the joint 6.

Further, in the present embodiment, the socket-shaped reinforcing joint 5 is cited as a piping member into which the laminated tube 1 is inserted, but it is particularly limited as long as it has a receiving portion connected to the laminated tube 1. There may be any of a pipe having a receiving portion, an elbow-shaped or cheese-shaped joint, a valve, or the like.

In the present embodiment, the connection structure of the laminated tube 1 and the reinforcing joint 5 is a connection structure in which the connection portion is melted and integrated with an adhesive, but elution of the adhesive component into the fluid is avoided. When the use conditions and the material of the outer tube 2 and the joint 6 are crystalline resins that are not suitable for connection by an adhesive, a connection structure by heat fusion may be used.

Further, in this embodiment, since a pipe made of PVC is used for the outer pipe 2, a rib (not shown) or a support (not shown) is bonded or welded to the outer peripheral surface of the laminated pipe 1 after the pipe construction. Can be installed. In addition, when pipes conforming to various standards are used for the outer pipe 2, it is effective because ready-made pipe holders and pipe holders can be used.

As described above, by laminating the outer tube 2 made of thermoplastic resin on the outer side of the inner tube 4 made of fiber reinforced resin, when connecting the tube made of fiber reinforced resin, Since it can be connected integrally by heat fusion, not only can the strength of the connection part be comparable to that of the pipe part, but it is not necessary to reinforce the connection part with fiber reinforced resin, so man-hours can be reduced. The construction period and construction cost can be reduced. In particular, when the construction is performed using an adhesive, the construction is not only extremely simple but also requires no equipment, so that the workability is greatly improved.

DESCRIPTION OF SYMBOLS 1 Laminated tube 2 Outer tube 3 Curable resin 4 Inner tube 5 Reinforcement joint 6 Joint 7 Fiber reinforced resin layer 8 Receiving part 9 Outlet part 10 Resin

Claims (8)

A laminated tube comprising a resin layer, wherein an inner tube made of a fiber reinforced resin having a curable resin applied to an outer surface thereof is formed by being inserted and bonded to an outer tube made of a thermoplastic resin. The laminated pipe according to claim 1, wherein a dimensional difference between the inner diameter of the outer pipe and the outer diameter of the inner pipe is 0.3 to 1.0 mm. The laminated tube according to claim 1, wherein the curable resin has a viscosity of 0.2 to 2 Pa · s. The laminated tube according to any one of claims 1 to 3, wherein a material of the outer tube is an amorphous resin. The laminated tube according to any one of claims 1 to 4, wherein a material of the inner tube is a glass fiber reinforced polyvinyl ester resin, and a material of the outer tube is a hard polyvinyl chloride resin. The laminated tube according to claim 5, wherein the curable resin contains a polyvinyl ester resin as a main component. The pipe joint in which the opening part of the edge part of the said laminated tube in any one of Claim 1 thru | or 6 was formed with the inner peripheral surface with the said thermoplastic resin, and the outer peripheral surface was formed with the said fiber reinforced resin. A laminated tube connection structure, wherein the laminated tube is inserted and connected to a receiving port of the tube. The connection structure for a laminated tube according to claim 7, wherein an end surface of the outlet portion of the laminated tube is coated with the same resin as the resin component of the inner tube.

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