Manufacturing method of reinforced fiber sheet useful for repairing/reinforced concrete structure

• US 6,183,835 B1
• Filed: 02/19/1999
• Issued: 02/06/2001
• Est. Priority Date: 08/27/1997
• Status: Expired due to Fees

• Current Assignee: Moo Soo Cho
• Original Assignee: Moon Soo Cho
• Inventors: Cho, Yong Jun, Cho, Se Hyun, Chung, Sam Tae, Jeong, Il Soo
• Primary Examiner(s): YAO, SAMCHUAN CUA
• Application Number:
  US09/252,822
• Time in Patent Office: 718 Days
• Field of Search: 156/62.2, 156/62.8, 156/324, 156/290, 156/292, 264/109, 264/112, 264/113, 52D/IG.7, 428/107, 428/113, 428/114, 442/43, 442/46, 442/49, 442/150, 442/181, 442/304
• US Class Current: 428/113
• CPC Class Codes: B29C 70/083 Combinations of continuous fibres or fibrous profiled structures oriented in one direction and reinforcements forming a two dimensional structure, e.g. mats B29D24/00, B29D99/001 take precedence
• CPC Class Codes: B29C 70/504 using rollers or pressure bands for corrugating B29C53/22
• CPC Class Codes: B32B 2262/0276 Polyester fibres
• CPC Class Codes: B32B 2262/062 Cellulose fibres, e.g. cotton
• CPC Class Codes: B32B 2262/101 Glass fibres
• CPC Class Codes: B32B 2262/106 Carbon fibres, e.g. graphite fibres
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: Y10S 52/07 Synthetic building materials, reinforcements and equivalents
• CPC Class Codes: Y10T 428/24074 Strand or strand-portions
• CPC Class Codes: Y10T 428/24124 Fibers
• CPC Class Codes: Y10T 428/24132 including grain, strips, or filamentary elements in different layers or components parallel
• CPC Class Codes: Y10T 442/172 Coated or impregnated
• CPC Class Codes: Y10T 442/178 Synthetic polymeric fiber
• CPC Class Codes: Y10T 442/183 Synthetic polymeric fiber
• CPC Class Codes: Y10T 442/2746 Heat-activatable adhesive
• CPC Class Codes: Y10T 442/30 Woven fabric [i.e., woven strand or strip material]
• CPC Class Codes: Y10T 442/40 Knit fabric [i.e., knit strand or strip material]

Abstract

A reinforced fiber sheet for use in repairing/reinforcing concrete structures including a net-shaped fabric substrate and reinforcing fibers uni-directionally and uniformly arranged on either side or both sides thereof. Also, a reinforced fiber sheet for use in repairing/reinforcing concrete structured including a first and a second substrate and reinforcing fibers uni-directionally and uniformly interposed between the first and second substrates. The substrate is a net-shaped fabric formed by cross-arranging organic or inorganic fiber strands and impregnating them with thermoplastic resins, and the reinforcing fiber is attached and bonded to the substrate by the thermoplastic resin.

Claims

1. A repairing/reinforcing concrete structure fiber sheet comprising:

a substrate; and

groups of reinforcing fibers uni-directionally and uniformly arranged and said groups of reinforcing fibers being spaced apart and free of resin directly connecting said groups of reinforcing fibers on either side thereof,

said substrate being a net-shaped fabric formed by cross-arranging organic or inorganic fiber strands in two or more directions, the strands being impregnated with a thermoplastic resin,

void spaces formed in regions located between intersecting fiber strands of said substrate,

said group of reinforcing fibers being attached and bonded to said substrate at said fiber strands of said substrate only by said thermoplastic resin impregnated onto the fiber strands of the substrate along the fiber strands only so as to form said void spaces between said thermoplastic resin impregnated fiber strands of said substrate, and

said fiber sheet including said substrate and said groups of reinforcing fibers being free from an adhesive resin laver between said substrate and said reinforcing fibers so that upon contact of said fiber sheet with a liquid matrix resin, said liquid matrix resin quickly penetrates into said fiber sheet.

2. The repairing/reinforcing concrete structure fiber sheet of claim 1, wherein said organic and inorganic fiber strands comprise one or more fibers selected from the group consisting of carbon fiber, glass fiber, cabulla fiber, aramid fiber, cotton fiber, nylon fiber and polyester fiber.