JP2015194254A - Coil wire rod and coil molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil wire rod and a coil molding proper to be buried underground and installed in an existing pipe.SOLUTION: A coil wire rod (12) for a coil molding (10) includes surface layers (12a) and an intermediate layer (12b) provided therebetween, the surface layers (12a) being formed with a carbon fiber-reinforced plastic in which carbon fibers are oriented in the longitudinal direction. The intermediate layer is thicker than the surface layer.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil wire and a coil molded body, and more particularly to a coil molded body and a coil wire forming a coil molded body that are laid in an existing pipe in order to rehabilitate an aged existing pipe.

An example of the background technology as the background of the present invention is disclosed in Patent Documents 1-4 and the like. In the technique of Patent Documents 1-4, a coil molded body is laid in an existing pipe, and the existing pipe is refurbished by lining a lining material inside the coil molded body.
JP2011-158087 [F16L 1/00 B29C 63/34 F16L 55/16] JP 2013-202887 [B29C 63/32 F16L 1/00] JP 2013-204703 [F16L 1/00 B29C 63/34] JP 2013-226808 [B29C 63/34 F16L 55/16, 1/00]

  The main object of the present invention is to provide a novel coil wire and coil molded body.

  Another object of the present invention is to provide a coil molded body and a coil wire suitable for laying in an existing pipe and rehabilitating the existing pipe.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  A first invention is a coil wire for a coil molded body, and is provided between a surface layer formed of carbon fiber reinforced plastic in which carbon fibers are oriented in the longitudinal direction, and the surface layer. A coil wire having an intermediate layer thicker than the thickness.

  In the first invention, the surface layer (12a) is formed of carbon fiber reinforced plastic. The orientation direction of the carbon fibers at this time is the longitudinal direction of the coil wire. The intermediate layer (12b) is formed of, for example, polyester fiber.

  In the first invention, the surface layer (12a) that generates high stress when a bending external force in the longitudinal direction is applied is formed relatively thin using a small amount of expensive high-strength carbon fiber reinforced plastic, and the stress is reduced. A small intermediate layer (12b) is formed to be relatively thick using a large amount of an inexpensive material such as polyester fiber, and the bending strength in the longitudinal direction is increased by increasing the resistance to bending (secondary moment of section). At the same time, it improves long-term bending creep characteristics.

  A second invention is a coil wire according to the first invention, wherein when the coil molded body is embedded in the soil, the coil molded body is imparted with an external pressure strength against the buried earth pressure.

  3rd invention is the coil molded object which formed the wire material for coils of 1st or 2nd invention helically.

  A fourth invention is a coil molded body for laying in an existing pipe and rehabilitating the existing pipe, and the coil wire of the first or second invention has a spiral shape whose outer diameter is slightly larger than the inner diameter of the existing pipe. A formed coil body.

  According to the present invention, a high-strength coil wire can be obtained at a relatively low cost, and therefore, a coil molded body suitable for burying in the soil or laying in an existing pipe and rehabilitating the existing pipe can be obtained. .

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

FIG. 1 shows a coil molded body according to an embodiment of the present invention, FIG. 1 (a) shows a fixed-length coil molded body, and FIG. 1 (b) shows a long coil molded body. FIG. 2 is a schematic view showing a coil wire according to an embodiment of the present invention, which forms the coil molded body of the embodiment of FIG. FIG. 3 is a schematic view showing a state in which a bending external force is applied to the surface layer of the coil wire material of FIG. 2 embodiment.

  Referring to FIG. 1, a coil molded body 10 according to an embodiment of the present invention is formed by spirally winding a long coil wire 12 as shown in FIG. 2, as shown in FIG. In both the regular-sized coil molded body 10 and the long-shaped coil molded body 10 shown in FIG. 1B, the outer diameter of the coil molded body is an aging existing pipe to be rehabilitated (not shown). It is set to be slightly smaller than, the same as, or slightly larger than the inner diameter.

  Various existing pipes to be rehabilitated using the coil molded body of the present invention are conceivable. For example, existing pipes for applications such as water and sewerage, gas, communication cable protection or power cable protection are used. These materials may be composed of materials such as reinforced concrete pipes (fume pipes), ceramic pipes, cast iron pipes, steel pipes, and synthetic resin pipes such as PVC pipes.

  Further, as a method of laying the coil molded body 10 as shown in FIG. 1 in an existing pipe and rehabilitating the existing pipe, the method described in Patent Documents 1-4 mentioned above may be used.

  A coil molded body 10 shown in FIG. 1 is formed using a long coil wire 12 as shown in FIG. The coil wire 12 includes a surface layer 12a and an intermediate layer 12b therebetween, and both the surface layers 12a are formed of CFRP (carbon fiber reinforced plastic). The orientation of the carbon fiber is the longitudinal direction of the coil wire 12. In this embodiment, the intermediate layer 12b is formed of polyester fibers whose longitudinal direction is the fiber orientation.

  However, the material of the intermediate layer 12b is not limited to polyester fiber. In addition, for example, glass fiber, epoxy resin, and the like can be used. When using a fiber, it may be oriented in a direction different from the surface layer or non-oriented.

  Typical required performance of a rehabilitation pipe rehabilitated using the coil molded body 10 is (1) a flat strength equal to or higher than that of a new pipe (for example, a PVC pipe), and (2) a new pipe (such as a fume pipe). (The cross-sectional reduction is from φ450 to φ408, for example). On the other hand, the coil molded body 10 needs to be as inexpensive as possible.

  The inventors have confirmed that the coil molded body 10 using the coil wire 12 shown in FIG. 2 satisfies the required performance. That is, when a flat external force is applied to the coil molded body 10, that is, when a bending external force is applied to the surface layer 12a of the coil wire 12 as shown in FIG. Resistant to bending (cross-section) by forming a relatively thin intermediate layer 12b using a small amount of high-strength carbon fiber reinforced plastic and a relatively thick intermediate layer 12b using a large amount of an inexpensive material such as polyester fiber. By increasing the second moment), the flattening strength is increased and the long-term bending creep property is improved. Therefore, when the coil molded body 10 formed of such a coil wire 12 is embedded in the soil, the coil wire 12 can impart sufficient external pressure strength against the embedded earth pressure to the coil molded body 10. it can.

  According to experiments by the inventors, considering the economy and performance, the ratio of the thickness of the surface layer 12a to the thickness of the intermediate layer 12b is 0 when the total thickness of the coil wire 12 is "1". .05-0.15: 0.7-0.9: 0.05-0.15 is appropriate, and this ratio is not so great even if the outer diameter of the coil molded body 10, that is, the nominal diameter of the existing pipe changes. It does not change.

  In addition, the coil molded object according to this invention can be used also for uses other than the rehabilitation of the existing pipe like an Example. In that case, the diameter of the coil molded body can be set arbitrarily. As another use, the use which substitutes the perforated pipe | tube embed | buried in soil can be considered. In that case, water flows out from the coil molded body 10 through the gap between the coil wires 12 of the coil molded body 10, or external water flows into the coil molded body 10.

  Furthermore, such a coil molded body 10 can be used for applications in which the axis is in the vertical direction in addition to applications in which the axis is in the horizontal direction as shown in FIG.

DESCRIPTION OF SYMBOLS 10 ... Coil molded object 12 ... Coil wire 12a ... Surface layer 12b ... Intermediate | middle layer

Claims (4)

A coil wire for a coil molded body,
A coil wire comprising: a surface layer formed of carbon fiber reinforced plastic in which carbon fibers are oriented in a longitudinal direction; and an intermediate layer provided between the surface layers and thicker than the thickness of the surface layer.   The coil wire according to claim 1, wherein when the coil molded body is embedded in the soil, the coil molded body is imparted with an external pressure resistance against an embedded earth pressure.   A coil molded body in which the coil wire according to claim 1 is formed in a spiral shape.   A coil molded body for laying in an existing pipe and rehabilitating the existing pipe, wherein the coil wire according to claim 1 or 2 has an outer diameter slightly smaller than or equal to the inner diameter of the existing pipe. Coil molded body formed into a large spiral.

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