JP2003049972A - Stacked pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe passage structure capable of reducing thickness of a pipe body, having superior construction efficiency, and capable of preventing leakage of internal fluid by enhanced pressure resistant property when applied to a gas pipe or a water pipe. SOLUTION: This stacked pipe passage contains a metallic or resin pipe body, and a pressure resistant coating layer formed on an outer surface side of the pipe body by winding a sheet having 3,430 N/mm<2> or more tensile strength and 210,000 N/mm<2> or more modulus of tensile elasticity around an outer periphery of the pipe body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated pipeline suitable for high pressure gas conduits, water pipes and the like.

[0002]

2. Description of the Related Art Conventionally, as a pipe body which is mainly laid and used in the ground and is required to have high pressure resistance, such as a sewer pipe, a drain pipe, a protective pipe for electric wires / telephone lines, etc. A reinforcing strip made of a thin metal plate having a substantially U-shaped cross section, which is substantially similar to the convex or concave portion of the resin pipe, is spirally wound along the inner surface of the resin pipe formed in the spiral wave shape as disclosed in Japanese Patent Laid-Open No. 220870/1990. A pressure-resistant synthetic resin tube wound in a circular shape is known.

Further, as a tubular body excellent in durability in which delamination does not occur even when it is used for a long period of time in a flowing water environment of repeated cold and heat, a metal tube such as that disclosed in JP-A-5-84802 is used. A synthetic resin-coated metal tube having a synthetic resin layer laminated on the inner surface is known.

A pipe line which is required to have pressure resistance and durability is formed by joining the above-mentioned pipe bodies according to the purpose and use.

[0005]

However, in the above-mentioned spiral wave-shaped pressure-resistant synthetic resin pipe, since the outer diameter and the inner diameter of the tubular body are greatly different, the outer diameter is different from the inner diameter determined by the fluid transfer conditions and the like. However, there is a demerit that the amount of earth and sand excavated at the time of burial increases and that the transportation and storage of the pipes are inconvenient.

Further, in the above-mentioned synthetic resin-coated metal pipe, a synthetic resin layer is used as a member on the inner surface side of the conduit to prevent internal fluid from leaking to the outside, and a metal pipe is used as a member on the outer surface side of the conduit. Although it is designed to withstand the fluid pressure and external force, in this case, it is necessary to increase the wall thickness of the metal pipe when applying it to high-pressure fluid, which causes the pipe itself to be heavy and impair the workability. Become. Further, when the pipes are connected, since the pipe wall is composed of two or more layers, it is necessary to perform a connection process for each layer, and the work is complicated.

The present invention has been made in view of the above-mentioned problems, and when applied to a gas conduit, a water pipe or the like, it is possible to prevent leakage of an internal fluid due to high pressure resistance, and at the same time, a pipe body The purpose of the present invention is to provide a pipeline structure in which the wall thickness can be reduced and the workability is good.

[0008]

In order to achieve such an object, the present invention has the following constitution. (1) Metal or resin tube and tensile strength of 343
0 N / mm ² or more, tensile elastic modulus 210000 N / mm ²
A laminated pipeline having a pressure resistant coating layer formed on the outer surface side of the tubular body by winding the above sheet around the outer periphery of the tubular body. (2) The laminated conduit according to item (1), wherein the sheet is a carbon fiber sheet. (3) The laminated pipeline according to item (1) or (2), wherein the sheet is wound around the outer circumference of the tubular body with an adhesive.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing an embodiment of the present invention.

As shown in FIG. 1, in the laminated pipe according to the present invention, a metal pipe such as a steel pipe or a resin pipe such as a polyethylene pipe is used as the member 1 on the inner surface of the pipe.
A member 3 on the outer surface side of the conduit for preventing the internal fluid from leaking to the outside.
A sheet such as a carbon fiber sheet having a tensile strength of 3430 N / mm ² or more and a tensile elastic modulus of 210000 N / mm ² or more is used as the outer periphery of the tubular body by winding the sheet around the outer periphery of the tubular body. The pressure resistant coating layer has sufficient strength against internal fluid pressure and external force. In this way, the leakage prevention function and the strength performance as a structure are shared by using appropriate members on the inner surface side and the outer surface side of the conduit, respectively, so that the conduit is thinner than the conventional conduit. Can be built.

Next, one embodiment of the procedure for constructing the laminated pipeline according to the present invention will be described.

As shown in FIG. 2, as a metal or resin pipe having a minimum wall thickness capable of preventing leakage of an internal fluid and ensuring workability, for example, thin steel pipes are butted and welded to each other. . In this case, the thinner the pipe thickness, the shorter the joining time between the steel pipes. After this welding, a base treatment such as the removal of unnecessary beads is applied, and an epoxy resin primer is applied to the entire outer surface of the steel pipe to correct the unevenness.

After connecting at least two steel pipes in this manner, a sheet such as a carbon fiber sheet having excellent tensile strength and tensile modulus is wound around at least one layer on the outer surface of the connected pipe. , Build a laminated conduit. Examples of the carbon fiber sheet having excellent tensile strength and tensile elastic modulus as described above include, for example, Torayca cloth (tensile strength of 3430 N / mm ² , tensile elastic modulus of 230,000 N).
/ Mm ² ). It has the same elastic modulus as iron,
By using such a material having a strength of about 10 times that of iron as a member on the outer surface side of the pipe, the pipe thickness can be reduced to about 1/10 as compared with the conventional pipe having the same diameter and the same pressure. It will be possible. For example, when the required pipe thickness of an outer diameter 1200A steel pipe through which a high-pressure gas of 10 MPa flows is about 30 mm, the layer thickness required to withstand the same pressure of the same diameter with a carbon fiber sheet having excellent tensile strength and tensile elastic modulus is about It will be 3 mm. The required pipe thickness of the thin-walled steel pipe that is the leakage prevention member on the inner surface of the pipe is 1 mm
Then, the pipe thickness of the laminated pipe is about 4 mm, which is about 1/10 of the conventional pipe thickness of about 30 mm.

In order to wrap and fix a sheet such as a carbon fiber sheet on the outer surface of a conduit made of thin-walled steel pipe, which has been subjected to a base treatment and a primer treatment, an impregnated adhesive epoxy resin or the like is used as an adhesive. Although it is preferable to use it, fixing with a band may be used together.

Also, by using a thin-walled polyethylene pipe or the like instead of a thin-walled steel pipe as the inner surface side member of the laminated pipeline according to the present invention, it is possible to construct a pipeline excellent in corrosion resistance.

Further, as another embodiment of the procedure for constructing the laminated pipeline according to the present invention, as shown in FIG. 3, a sheet is preliminarily wrapped around the outer periphery of each tubular body except for both ends and fixed. Was prepared in a factory, etc., and after joining the pipes on site, the surface treatment of the joint part was performed in the same way as in the above-mentioned embodiment, and the sheet was wrapped around that part so as to overlap with the existing sheet. By fixing, it is possible to cover the entire conduit with the sheet.

[0018]

According to the present invention described above, the internal fluid leakage can be prevented by the member on the inner surface of the pipeline, and the member on the outer surface of the pipeline has sufficient strength against internal fluid pressure and external force. It becomes possible. In addition, the leak prevention function and the strength performance are shared by appropriate members on the inner surface side and the outer surface side of the conduit, respectively, so that the conduit can be constructed with a thinner pipe thickness as compared with the conventional one.

In the laminated conduit according to the present invention, the thickness of the conduit can be reduced to about 1/10 of that of the conventional conduit, so that the cross-section loss due to the difference in the inner and outer diameters of the conduit is significantly reduced. That is, it becomes possible to pass a required amount of fluid through a pipe having an outer diameter smaller than that of the conventional one. Therefore, in the case of burial construction, the amount of excavated soil is reduced and the workability is improved, and the cost can be reduced.

Further, as apparent from the above, in the renewal work of the existing pipeline, it is possible to directly draw the laminated pipeline according to the present invention into the space inside the existing pipeline without disassembling the existing pipeline. is there.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an embodiment of a construction procedure according to the present invention.

FIG. 3 is an explanatory view showing another embodiment of the construction procedure according to the present invention.

[Explanation of symbols]

1 Inside surface of pipe 3 Pipe outer surface side member

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16L 9/12 F16L 9/12 9/14 9/14 9/16 9/16 F term (reference) 3H111 AA01 BA01 BA15 BA28 BA34 CA03 CA52 CA53 CB08 CB10 CB14 CB23 CC03 CC04 CC07 CC13 CC18 CC19 DA07 DB02 DB11 DB12 EA15 EA17 4F100 AA36B AB01A AB03 AK01A BA02 BA07 DD31 DG01B EH51B GB90 JK02B JK07B JL05

Claims (3)

[Claims] 1. A metal or resin tubular body and tensile strength
Is 3430 N / mm ²Above, the tensile elastic modulus is 210000
N / mm²Wrap the above sheet around the outside of the tube
And a pressure resistant coating layer formed on the outer surface side of the tubular body
A laminated conduit characterized by having. 2. The laminated conduit according to claim 1, wherein the sheet is a carbon fiber sheet. 3. The laminated pipeline according to claim 1 or 2, wherein the sheet is wound around the outer circumference of the tubular body with an adhesive.