JPH06193777A - Fluid transport pipe - Google Patents

Abstract

PURPOSE:To form the reinforced layer of a fluid transport pipe without requiring the winding work for metal strips which has the low workability and is dangerous. CONSTITUTION:The reinforced layer 14 of a fluid transport pipe 10 is formed by combining the wound layers 20A and 20B and the longitudinally attached layers 22A and 22B of a sheet shaped or strip shaped prepreg 20 having metal strips 24 embedded inside. Since, in such a case, the metal strips 24 inside the prepreg 26 are arranged in a lattice form, the metal strips 24 effectively act to both of the hoop stress applied by the fluid transported in a plastic pipe 12 and the load in the axis line direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a fluid transport pipe used for transporting high pressure fluid such as crude oil and natural gas.

[0002]

2. Description of the Related Art Generally, a fluid transport pipe of this type comprises a plastic pipe and a reinforcing layer provided on the plastic pipe to reinforce the hoop stress of fluid pressure of the plastic pipe and the axial load. ing. In the conventional fluid transport pipe, the reinforcing layer includes an internal pressure reinforcing layer portion formed by winding a sheet-shaped or strip-shaped prepreg having a metal strip embedded therein and an axial reinforcing layer formed by winding the metal strip at a large pitch. Consists of parts and.

[0003]

However, in the fluid transport pipe of this prior art, since the axial reinforcing layer portion is formed by winding a large number of metal strips, the winding work of the metal strips is troublesome. The workability is low, and there is a drawback in that safety is poor because it is necessary to carefully perform the work so that the worker is not rebounded when the metal strip is wound.

An object of the present invention is to provide a fluid transport pipe which can avoid the above-mentioned drawbacks and can form a reinforcing layer with high workability and safely.

[0005]

SUMMARY OF THE INVENTION To solve the above problems, the present invention provides a plastic pipe and a reinforcement provided on the plastic pipe against the fluid pressure and the axial load inside the plastic pipe. In the fluid transport pipe consisting of a reinforcing layer, the reinforcing layer is formed by combining a winding layer of a sheet-shaped or strip-shaped prepreg having metal strips embedded therein and a vertical attachment layer so that the metal strips inside the prepreg form a grid. Another object of the present invention is to provide a fluid transport pipe characterized by being formed into a shape.

[0006]

As described above, the reinforcing layer of the fluid transport pipe is formed by combining the winding layer of the sheet-shaped or strip-shaped prepreg having the metal strips embedded therein and the vertical attachment layer so that the metal strips inside the prepreg form a lattice pattern. In this case, the grid-shaped metal strip effectively acts on both the hoop stress and the axial load received by the fluid transported in the plastic pipe, and thus the plastic pipe can be reliably reinforced. Further, the reinforcing layer portion which acts on the load in the axial direction can be formed easily and safely, because the prepreg in which the metal strip is embedded can be formed vertically without winding the metal strip. be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described in detail. FIG. 1 shows a fluid transport pipe 10 according to the present invention. The fluid transport pipe 10 includes a plastic pipe 12 and a plastic pipe 12. A plastic coating 16 and a reinforcing layer 14 provided on top of the plastic tube 12 to reinforce the fluid pressure inside the plastic tube 12 and the axial load. In the illustrated embodiment, the auxiliary reinforcing layer 18 made of a metal flexible tube is provided on the inner surface of the plastic tube 12, but the auxiliary reinforcing layer 14 may be omitted. The reinforcing layer 18 is inside / outside 2
It consists of two reinforcing layer parts 20, 22.

The inner reinforcing layer portion 20 is shown in FIG.
The reinforcing layer portion 20 is formed by spirally winding a sheet-shaped or strip-shaped prepreg 26 having a metal strip 24 embedded therein as shown in FIG. In the illustrated embodiment, the winding layers are two layers as indicated by reference numerals 20A and 20B in FIG.

The outer reinforcing layer portion 22 is shown in FIG. 4, and the reinforcing layer portion 22 is a sheet-shaped or strip-shaped prepreg having a metal strip 28 embedded therein as shown in FIG. As shown in (B) and (C) of FIG.
It consists of A and 22B.

As described above, the inner and outer reinforcing layer portions 20, 22
Winding layers 20A and 20B of prepregs 26 and 30 in which metal strips 24 and 28 are embedded, and vertical attachment layers 22A and
It can be seen that the metal strips 24 and 28 are arranged so as to form a lattice shape that intersects with each other by spiral winding and vertical attachment when they are made of 22B.

These inner and outer reinforcing layer portions 20 and 22 are
It is formed by heating and compressing the winding layers 20A and 20B and the vertical attachment layers 22A and 22B of the prepregs 26 and 30. Since the inner and outer reinforcing layer portions 20 and 22 formed in this way have the metal strips 24 and 28 arranged in a grid, they can withstand the pressure of the fluid transported in the plastic pipe 12.

Further, since the outer reinforcing layer portion 22 is composed of a vertical supporting layer of the sheet-shaped or strip-shaped prepreg 30 in which the metal strips 28 are embedded, the outer reinforcing layer portion 22 is resistant to the axial load applied to the fluid transport pipe 10. Can bear.

[0013]

According to the present invention, as described above, the reinforcing layer of the fluid transport pipe is formed by combining the winding layer of the sheet-shaped or strip-shaped prepreg having the metal strips embedded therein and the vertical attachment layer. Since the metal strip inside the prepreg was formed so as to form a grid, the grid-shaped metal strip effectively acts on both the hoop stress and the axial load received by the fluid transported in the plastic pipe, Therefore, the plastic pipe can be reliably reinforced.

Further, since the reinforcing layer portion which acts on the load in the axial direction can be formed by simply vertically arranging the prepreg in which the metal strip is embedded without winding the metal strip, a large number of metal strips can be formed. There is a practical benefit of being able to easily and safely manufacture without requiring the troublesome work of winding the strip.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an upper half of a part of a fluid transport pipe according to the present invention.

2 is a cross-sectional view of the fluid transport tube of FIG.

FIG. 3 shows a state in which an inner reinforcing layer portion used for the fluid transport pipe of the present invention is formed, and FIG. 3 (A) is a perspective view of a prepreg used for forming this reinforcing layer portion, and FIG. 8C is a top view showing a state in which the inner reinforcing layer portion is formed, and FIG. 16C is a cross-sectional view showing a state in which the inner reinforcing layer portion is formed.

FIG. 4 shows a state in which an outer reinforcing layer portion used in the fluid transport pipe of the present invention is formed, and FIG. 4A is a perspective view of the prepreg used to form this reinforcing layer portion, and FIG. 8C is a perspective view showing a state in which one outer reinforcing layer portion is formed, and FIG. 16C is a perspective view showing a state in which two outer reinforcing layer portions are formed.

[Explanation of symbols]

 10 Fluid Transport Pipe 12 Plastic Pipe 14 Reinforcement Layer 16 Plastic Coating 18 Auxiliary Reinforcement Layer 20 Inner Reinforcement Layer Part 20A Wound Layer 20B Wound Layer 22 Outer Reinforcement Layer Part 22A Vertical Attached Layer 22B Vertical Attached Layer 24 Metal Strip 26 Prepreg 28 Metal Article 30 prepreg

Claims (1)

[Claims] 1. A fluid transport pipe comprising a plastic pipe and a reinforcing layer which is provided on the plastic pipe and reinforces a fluid pressure inside the plastic pipe and an axial load, wherein the reinforcing layer comprises: Fluid transportation characterized in that the metal strips inside the prepreg are formed in a grid pattern by combining a winding layer and a vertical attachment layer of a sheet-shaped or strip-shaped prepreg in which metal strips are embedded. tube.