JPH07317967A - Fiber reinforced resin compound pipe - Google Patents

Abstract

PURPOSE:To provide a fiber reinforced resin compound pipe in which a spigot and a faucet are never broken owing to the contact between spigots each other in the loading and the conveying work of pipes, and an impact by a hammer and the contact of the spigot and the faucet in the connecting work, and furthermore, the productivity is excellent. CONSTITUTION:Between the inner fiber reinforced resin layer 11 and the outer fiber reinforced resin layer 12, an intermediate layer 13 which consists of a resin mortar is provided, and a spigot 14 is provided at one end. An elastic body 15 is installed to the spigot 14 to cover the exposed part of the intermediate layer 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced resin composite pipe suitably used as a pipe buried in the ground by an excavation method.

[0002]

2. Description of the Related Art Conventionally, as a piping material buried in the ground by an excavation method, an intermediate layer made of resin mortar is provided between inner and outer fiber reinforced resin layers, and a spout is formed at one end.
A fiber-reinforced resin composite pipe having a receiving end formed at the other end may be used. This fiber reinforced resin composite pipe can be piped by the open-cut method.The fiber reinforced resin pipe can be tapped with a hammer etc. by pointing the opening of the subsequent fiber reinforced resin pipe into the socket. A method in which the connecting portion and the spigot portion are sequentially connected is adopted as a simple method.

However, since the intermediate layer made of resin mortar is exposed at the spout of such a fiber-reinforced resin composite pipe, the spout may come into contact with the spout during loading or transportation of the pipe. The end part of the fiber is damaged, the inner layer and the inner / outer inner / outer fiber-reinforced resin layer are peeled off, and the intermediate layer made of resin mortar is exposed at the receiving part. There is a problem in that the spigot and the socket are damaged due to impact or contact between the two.

In view of this point, for example, the actual fairness 2-430
In JP-A-8, the outer peripheral surface and the inner peripheral surface are formed of reinforced plastic, a resin mortar layer is sandwiched between the both surfaces, and a step for inserting a joint is provided on the pipe end side of the outer peripheral surface. A plastic composite pipe for a propulsion pipe, which is made of reinforced plastic, has been proposed. In addition, fair fair 4-1031
No. 9 gazette discloses that a water blocking rubber is provided on the inner surface of the receiving port and the outer surface tube of the insertion port in the fitting portion, and a resin pad plate is interposed at the abutting portion between the step inside the receiving port and the front end surface of the insertion port. A joint structure of the reinforced plastic composite pipe has been proposed.

[0005]

However, in the former case, a composite pipe having a resin mortar layer and only the pipe ends made of reinforced plastic cannot be obtained by continuous production, which is complicated. Since it is necessary to form the pipe end with a reinforced plastic through various post-processing steps, there is a problem that productivity is poor and cost is high.

In the latter case, when connecting the pipes,
Even if it is possible to avoid direct contact between the socket back step and the inlet tip surface by the resin backing plate that is intervened in the abutting part between the socket back step and the outlet tip surface, There is a problem that the ends of the spigots may be damaged or peeling between the intermediate layer and the inner and outer surfaces may occur due to contact between the spigots during loading and transportation.

The present invention solves the above-mentioned problems of the prior art and makes contact between the spouts at the time of loading and transporting pipes, impact by a hammer at the time of connection, and contact with the receiving part of the spout. Thus, the purpose of the present invention is to provide a fiber-reinforced resin composite pipe having excellent productivity without damaging the spigot and the receiving part.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a fiber reinforced resin pipe in which an intermediate layer made of resin mortar is provided between inner and outer fiber reinforced resin layers, and at least one end portion is formed with a spout portion. The fiber-reinforced resin composite pipe has an elastic body attached to a portion thereof so as to cover the exposed portion of the intermediate layer.

In the present invention, curable resin-impregnated reinforcing fibers are used to form the inner and outer fiber-reinforced resin layers. As the resin in the curable resin-impregnated reinforcing fiber, for example, a thermosetting resin such as an unsaturated polyester resin or an epoxy resin is preferably used, and a photocurable resin can be used depending on the case. Fillers such as Aerosil, glass balloons, calcium carbonate, and talc may be added to the curable resin, if necessary.

A hardener and a curing accelerator are generally added to the curable resin, but conventionally known ones may be used, and examples of the thermosetting agent include methyl ethyl ketone peroxide and benzoyl peroxide. Examples of the curing accelerator include cobalt naphthenate, manganese naphthenate, and dimethylaniline.

The material of the reinforcing fiber in the curable resin-impregnated reinforcing fiber is not particularly limited, and it is an inorganic fiber such as glass fiber or carbon fiber, or an organic fiber such as aramid fiber or polyethylene terephthalate fiber (PET fiber). Is mentioned. Examples of the form of the reinforcing fiber include roving fiber, roving cloth tape, glass cloth tape, interlaced tape, chopped strand tape, continuous tape and the like.

In the present invention, a resin mortar is used to mold the intermediate layer, and the resin mortar comprises a curable resin and an aggregate. As the curable resin in the resin mortar, the curable resin in the curable resin-impregnated reinforcing fiber forming the inner and outer fiber reinforced resin layers is used. As the aggregate in the resin mortar, river sand, silica sand, etc. are used.

The method for producing the fiber-reinforced resin composite pipe of the present invention includes, for example, forming an inner fiber-reinforced resin layer on a core die such as an endless belt or a paper pipe that moves in the axial direction while rotating in the circumferential direction. A curable resin-impregnated reinforcing fiber for forming an intermediate layer is formed by winding a curable resin-impregnated reinforcing fiber and supplying resin mortar on the wound resin. After winding, the resin may be cured and integrally molded. The core die is appropriately removed after winding the molding material when an endless belt is used as the core die and after curing when a paper tube is used as the core die.

The usual curing means can be adopted for curing the resin,
When the resin is a thermosetting resin, it is usually heated by heating means such as a heater, and when the resin is a photocurable resin, it is usually irradiated with ultraviolet rays.

The shape of the elastic body must be such that it is attached to the spout so as to cover the exposed portion of the intermediate layer at the end. For example, the cross-sectional shape is substantially L-shaped, An annular shape having a letter shape or a substantially U shape may be used. At this time, in order to prevent the elastic body from easily slipping out of the spigot, a method of performing a simple cutting process on the end of the spigot or adhering it through an adhesive layer is appropriately adopted.

As the material of the elastic body, one made of an elastic body is used. For example, natural rubber, butadiene rubber,
Synthetic rubbers such as styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, silicon rubber, fluororubber, and acrylic rubber are used.

[0017]

The fiber-reinforced resin composite pipe of the present invention is a fiber-reinforced resin pipe in which an intermediate layer made of resin mortar is provided between the inner and outer fiber-reinforced resin layers, and at least one end portion is formed with a spout portion. Since the elastic body is attached to the part so as to cover the exposed part of the intermediate layer, the intermediate layers do not come into direct contact with each other even if the spouts come into contact with each other when loading or transporting the pipe. Therefore, there is no damage to the end of the spigot or peeling between the intermediate layer and the inner / outer inner / outer fiber-reinforced resin layer, and even if a shock is applied by a hammer during connection, Since the end part is protected by the elastic body, the end part and the end part are not damaged by the contact with the end part, and the end part of the end part is simply cut. It is excellent in productivity because it is only necessary to attach the elastic body later.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway front view showing an example of a spigot portion of a fiber-reinforced resin composite pipe of the present invention. The fiber reinforced resin composite pipe 1 includes an inner fiber reinforced resin layer 11 and an outer fiber reinforced resin layer 1
An intermediate layer 13 made of resin mortar is provided between the first and second layers.

A spigot portion 14 is formed at one end of the fiber-reinforced resin composite pipe 1, and a not-shown receiving portion is formed at the other end. At the spigot 14 formed at one end of the fiber-reinforced resin composite pipe 1, the end of the outer fiber-reinforced resin layer 12 is deleted, and the middle layer 13 is in a state where the outer surface and the end surface of the end are exposed. ing.

The outlet 14 has an annular shape with a substantially L-shaped cross section so as to integrally cover the outer surface of the end and the exposed surface of the end and the end of the inner fiber reinforced resin layer 11. An elastic body 15 made of an elastic material such as rubber is attached.

As a result, the intermediate layers 13 of the spout 14 do not come into direct contact with each other when the pipes are loaded or transported,
There is no possibility of damaging the end of the spigot 14 or peeling between the intermediate layer 13 and the inner and outer fiber reinforced resin layers 11 and 12.

FIG. 2 is a partially cutaway front view showing another example of the spigot of the fiber-reinforced resin composite pipe of the present invention. In the spigot 24 formed at one end of the fiber-reinforced resin composite pipe 2, the end of the inner fiber-reinforced resin layer 21 and the outer fiber-reinforced resin layer 2
The two end portions are both removed, and the intermediate layer 23 is in a state in which the inner and outer surfaces and the end surface of the end portion are exposed.

An elastic body 23 made of an elastic material such as an annular rubber having a substantially U-shaped cross section is attached to the spigot portion 24 so as to integrally cover the exposed surfaces of the inner and outer surfaces of the end portion and the end surface. ing. Other configurations are similar to those described with reference to FIG. 1, and thus detailed description thereof will be omitted.

Next, the piping construction process of the fiber-reinforced resin composite pipe 1 shown in FIG. 1 will be described with reference to FIG. First, FIG.
As shown in (a), an elastic body 15 'is provided in the receiving portion 15 of the preceding fiber-reinforced resin composite pipe 1 so as to cover the exposed portion of the intermediate layer 13' of the subsequent fiber-reinforced resin composite pipe 1 '. Positioning is performed so that the attached part 14 'is attached to the attached part.

Next, as shown in FIG. 3 (b), a batten is appropriately applied from the receiving end of the subsequent fiber-reinforced resin composite pipe 1 ', and a hammer is struck on the batten, The opening 14 'of the subsequent fiber-reinforced resin composite pipe 1'is inserted into the receiving portion 16 of the preceding fiber-reinforced resin composite pipe 1 to be connected. At this time, the spigot portion 14 ′ is the intermediate layer 1
Since the elastic body 15 'is attached so as to cover the exposed portion of 3', the impact by the hammer at the time of connection is mitigated, and there is no direct contact between the two, and the spigot portion 14 ′ And the socket 16 are not damaged.

[0026]

Since the fiber-reinforced resin composite pipe of the present invention has the above-mentioned structure, the pipes come into contact with each other during loading or transportation, and the impact or spigot caused by a hammer when connecting the pipes. Since the contact part and the receiving part do not damage the spigot part and the receiving part, the productivity is excellent.

[0027]

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of a fiber-reinforced resin composite pipe of the present invention.

FIG. 2 is a partially cutaway front view showing another example of the fiber-reinforced resin composite pipe of the present invention.

3A and 3B are explanatory views showing an example of a connecting process of the fiber-reinforced resin composite pipe shown in FIG. 1, in which FIG. 3A is a sectional view showing a first half of the process, and FIG. 3B is a sectional view showing a second half of the process. is there.

[Simple explanation of symbols]

 1, 1 ', 2 Fiber reinforced resin composite pipe 11 Inner fiber reinforced resin layer 12 Outer fiber reinforced resin layer 13, 13', 23 Intermediate layer 14, 14 ', 24 Spout

Claims (1)

[Claims] 1. A fiber reinforced resin pipe having an intermediate layer made of resin mortar provided between inner and outer fiber reinforced resin layers and having a spigot portion at one end, wherein an exposed portion of the intermediate layer is provided at the spout portion. A fiber-reinforced resin composite pipe, wherein an elastic body is attached so as to cover the fiber-reinforced resin composite pipe.