Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Coated or impregnated woven – knit – or nonwoven fabric which... – Fabric composed of a fiber or strand which is of specific...
Patent
1998-02-26
1999-12-21
Weisberger, R C
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Coated or impregnated woven, knit, or nonwoven fabric which...
Fabric composed of a fiber or strand which is of specific...
442192, 442203, 442205, 442208, 139 1, 139383, D04B 2114
Patent
active
060048883
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fibrous sheet for structure reinforcement and a structure reinforced with the same. The present invention relates in more detail to a fibrous sheet for structure reinforcement most suitable for reinforcing not only general structures but also piers and floor systems of elevated structures, columns and walls of buildings, and the like, and a structure reinforced with the sheet.
BACKGROUND ART
Social problems have recently arisen from the brittleness and durability of cement structures, for example, destruction of bridges caused by earthquakes, rust formation on reinforcing bars caused by the neutralization of concrete, the fatigue of reinforcing steels caused by a sharp increase in traffic volumes, and the like. Replacing the structures with new ones is naturally satisfactory. However, replacing them is very costly.
When a pier of an elevated structure is taken as an example, a method for reinforcing the pier by bonding a steel sheet to the column containing concrete with an adhesive and a method for reinforcing it by bonding sheet-like reinforcing layers containing carbon fibers have been employed as countermeasures. In particular, the latter method has come to be adopted recently because the reinforced structures show significant reinforced effects and excellent durability, and because the reinforcing operation is simple. In the sheet-like reinforcing layers containing carbon fibers mentioned above, a number of carbon fibers are arranged in parallel in one or two directions. For example, Japanese Patent Kokai Publication Nos. 5-332031 and 7-243149 propose fibrous sheets for structure reinforcement in which carbon fibers are arranged in one direction. According to the former patent publication, carbon fiber bundles each containing a number of collected carbon fibers are arranged on an auxiliary sheet in one direction through an adhesive layer. According to the latter patent publication, carbon fibers are unidirectionally pulled mutually in parallel and in a sheet-like manner to form a sheet surface, and a weave structure is formed with transverse direction secondary fiber bundles and longitudinal direction secondary fiber bundles parallel to the carbon fibers, both types of the bundles being situated on respective sides of the sheet, to hold the sheet-like carbon fiber bundle arranged in one direction.
Furthermore, Japanese Patent Kokoku Publication Nos. 57-52221 and 8-23096 propose fibrous sheets for structure reinforcement in which carbon fibers are bidirectionally arranged.
According to the former patent publication, two carbon fiber bundles the carbon fibers of which are pulled unidirectionally and mutually in parallel in a sheet-like manner within each bundle and which face each other form a bidirectional sheet surface. The sheet surface is made to form a weave structure by longitudinal secondary fibers and transverse secondary fibers which are parallel to the respective fiber bundles, and is integrally held. According to the latter patent publication, a bias fabric is formed by a longitudinal carbon fiber bundle and a transverse carbon fiber bundle extending obliquely in relation to the longitudinal carbon fiber bundle, and the carbon fibers are bidirectionally arranged on the bias.
These unidirectional or bidirectional fibrous sheets for structure reinforcement are prepared to display the excellent high strength and high elastic modulus of the carbon fibers in the fiber axial direction as much as possible. Moreover, an auxiliary sheet and secondary fibers other than the carbon fibers are used to integrally hold the carbon fibers and obtain a fibrous sheet for structure reinforcement having a decreased fiber slippage within a sheet. That is, though a woven fabric is generally prepared by mutually intersecting warps and wefts to have a decreased fiber slippage, the constituent fibers are markedly bent at the intersectioning points of the warps and wefts. As a result, when a stress is applied to the fabric, the stress is concentrated at the bent po
REFERENCES:
Emery, The Primary Structure of Fabrics, The Textile Museum, pp. 74-75, 1966.
Lehner: "Die Chancen der Kettenwirkerei im Wachstumsmarkt der technischen Textilien", Melliand Textilberichte, vol. 70, No. 6, Jun. 1989, Heidelberg, pp. 428-432, XP000073155.
Honjou Takeshi
Sugimoto Morihiko
Teijin Limited
Weisberger R C
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