Fiber-reinforced plastic sheet pile

A technology for strengthening plastics and fibers, which can be used in sheet pile walls, chemical instruments and methods, infrastructure engineering, etc., and can solve problems such as inability to cut sheet piles

Inactive Publication Date: 2013-12-04
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not possible to directly excavate the walls of shaft pits made of steel sheet piles with a TBM lowered into the ground
This is because the shield machine cannot cut the steel sheet pile

Method used

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  • Fiber-reinforced plastic sheet pile
  • Fiber-reinforced plastic sheet pile
  • Fiber-reinforced plastic sheet pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Prepare #300 glass fiber short glass mat (trade name: MC300A, manufactured by Nitto Boseki Co., Ltd.), #800 glass fiber roving cloth (trade name: WR800C-100, manufactured by Nitto Boseki Co., Ltd.), #330 Carbon fiber cloth (trade name: W-6101, flat-woven carbon fiber cloth, manufactured by TOHO TENAX Co., Ltd.), #300 carbon fiber unidirectional cloth (trade name: UM46-30G, manufactured by Toray Industries Inc.). Here, each fiber is rectangular, and the width of each fiber used is described in Table 1. The size of the fibers was determined so that they could be placed in the preforming mold under the conditions listed in Table 1. As a preforming die, a steel sheet pile type III die having a length of 6000 mm was prepared.

[0081] These carbon fibers and glass fibers were stacked one by one in the preforming mold to obtain the fiber constitution shown in Table 1. As a result, a fiber preform having approximately the same shape as the final molded product (FRP sheet pil...

Embodiment 2

[0104] Make carbon fiber and glass fiber into the fiber structure shown in Table 2, such as disposing #300 carbon fiber unidirectional fabric (UD) on the side part (11B) of the 36th to 37th layer, or adopting a 45-layer structure, etc. The same operation was performed in Example 1 to obtain the FRP sheet pile of Example 2.

[0105] Table 2

[0106]

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Abstract

A fiber-reinforced plastic sheet pile (10) includes a web portion (11), flange portions (12) arranged at two ends of the web portion (11) in a manner continuous with the two ends of the web portion (11). The web portion (11) and the flange portions (12) are composed of an intermediate layer (14) and surface layers (15) covering the intermediate layer (14) in a clamping manner from a thickness direction of the intermediate layer (14). The intermediate layer (14) is made of fiber-reinforced plastic containing glass fibers; and the surface layers are made of fiber-reinforced plastic containing carbon fibers.

Description

technical field [0001] The present invention relates to sheet piles made of fiber reinforced plastics. Background technique [0002] In plumbing engineering in civil engineering, shield machines are mainly used when excavating urban pipelines (sewers, common trenches, etc.). In order to lower the shield machine underground to the depth of excavating pipes, it is necessary to dig a vertical pit and construct a retaining wall on the wall of the vertical pit using sheet piles. Conventionally, steel sheet piles have been used for this retaining wall. However, it is impossible to directly excavate the wall surface of the vertical pit formed by the steel sheet piles with the shield machine lowered into the ground. This is because the shield machine cannot cut the steel sheet pile. Therefore, studies are underway to replace only the portion through which the shield machine passes with fiber reinforced plastics (Fiber Reinforced Plastics, FRP) that can be cut by the shield machin...

Claims

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Application Information

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IPC IPC(8): E02D5/03B32B27/04B32B17/04B32B9/04
CPCB32B27/08B32B27/36B32B27/38B32B2262/101B32B2262/106B32B2305/08B32B2307/536
Inventor 兼本道成泽田荣嗣吉冈主税
Owner DAINIPPON INK & CHEM INC
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