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

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.