Repair and strengthening system for reinforced concrete structure

Abstract

A repair and strengthening system for a reinforced concrete structure has a ribbed steel plate, and a filler. The ribbed steel plate is disposed facing a strengthened area with a predetermined space therebetween. The strengthened area is an area to be strengthened in a structure surface that is a surface of a reinforced concrete structure. The filler is injected in the space between the structure surface and the ribbed steel plate. Ribs are formed on the ribbed steel plate by hot rolling. The ribs protrude from a steel-plate front face that is a side of the ribbed steel plate facing the structure surface.

We claim: 
     
         1 . A repair and strengthening system for a reinforced concrete structure, comprising:
 a steel plate that is disposed with a space to a structure surface, the structure surface being a surface of the reinforced concrete structure; and   a filler that is injected in the space,   wherein a plurality of protrusions are formed on a steel-plate front face that is a surface on one side of the steel plate, and the steel-plate front face faces the structure surface.   
     
     
         2 . A repair and strengthening system for a reinforced concrete structure, comprising:
 a steel plate that is disposed with a space to a structure surface, the structure surface being a surface of the reinforced concrete structure; and   a filler that is injected in the space,   wherein a plurality of openings are formed in the steel plate, and the openings are blocked by the filler.   
     
     
         3 . A repair and strengthening system for a reinforced concrete structure, comprising:
 a steel plate that is disposed in contact with a structure surface, and is provided with a plurality of openings, the structure surface being a surface of the reinforced concrete structure; and   a filler that blocks the openings.   
     
     
         4 . The repair and strengthening system for a reinforced concrete structure of  claim 3 , wherein a plurality of protrusions are formed on a steel-plate front face that is a surface on one side of the steel plate, and at least one of the plurality of protrusions is in contact with the structure surface. 
     
     
         5 . The repair and strengthening system for a reinforced concrete structure of  claim 3 , wherein a plurality of protrusions are formed on a steel-plate back face that is a surface on another side of the steel plate, and the plurality of protrusions formed on the steel-plate back face are surrounded by the filler. 
     
     
         6 . The repair and strengthening system for a reinforced concrete structure of  claim 3 , wherein the repair/strengthening system has a plurality of the steel plates, and in one steel plate pair of the steel plates, at least one of the openings of one steel plate and at least one of the openings of another steel plate overlap each other, and the one steel plate and the other steel plate are integrated together by the filler injected in overlapping openings of the one steel plate and overlapping openings of the other steel plate. 
     
     
         7 . The repair and strengthening system for a reinforced concrete structure of  claim 2 , wherein the plurality of openings are formed by enlarging a plurality of slits formed in the steel plate by stretching. 
     
     
         8 . The repair and strengthening system for a reinforced concrete structure of  claim 1 , wherein the plurality of protrusions are formed integrally when the steel plate is manufactured by hot rolling. 
     
     
         9 . The repair and strengthening system for a reinforced concrete structure of  claim 8 , wherein the plurality of protrusions are spaced by 30 mm to 40 mm from each other, have a height of 2.5 mm to 5.0 mm, and have a width of 4 mm to 20 mm, the width being a distance in a direction perpendicular to a direction of the hot rolling at a base of the protrusions. 
     
     
         10 . The repair and strengthening system for a reinforced concrete structure of  claim 1 , wherein the steel plate is supported by a hang bolt, the hang bolt being installed in the reinforced concrete structure and projecting from the structure surface. 
     
     
         11 . The repair and strengthening system for a reinforced concrete structure of  claim 1 , wherein:
 the reinforced concrete structure includes the structure surface, and a pair of structure sides that are continuous with the structure surface;   the repair/strengthening system comprises
 a steel-plate support member including
 a support horizontal member that is disposed in parallel to the structure surface, 
 a pair of support vertical members that are disposed in parallel to the pair of structure sides, and 
 
 a supporting bolt that is installed in the reinforced concrete structure, and projects from the pair of structure sides; 
   the steel-plate support member is installed onto the reinforced concrete structure with the supporting bolt that penetrates a vertical-member through-hole formed in the pair of support vertical members; and   the steel plate is installed on the support horizontal member of the steel-plate support member.   
     
     
         12 . The repair and strengthening system for a reinforced concrete structure of  claim 11 , wherein:
 the vertical-member through-hole is elongated in a direction perpendicular to the support horizontal member;   a height adjusting bolt is installed to each of the support vertical members, the height adjusting bolt being movable in the direction perpendicular to the support horizontal member and abutting against the supporting bolt at a distal end; and   as the height adjusting bolt is turned, the steel-plate support member is moved in a direction perpendicular to the structure surface.   
     
     
         13 . The repair and strengthening system for a reinforced concrete structure of  claim 11 , wherein:
 a guide projection is provided on a steel-plate back face, the steel-plate back face being a side opposite to the steel-plate front face;   the support horizontal member is provided with a support-member guide groove into which the guide projection enters; and   as the guide projection is guided by the support-member guide groove and moves, the steel plate is able to move relatively with respect to the steel-plate support member.   
     
     
         14 . The repair and strengthening system for a reinforced concrete structure of  claim 11 , wherein the support horizontal member and the support vertical members are detachably coupled by a fastening bolt. 
     
     
         15 . The repair and strengthening system for a reinforced concrete structure of  claim 1 , wherein the steel plate includes a pair of steel-plate sidewall parts, the pair of steel-plate sidewall parts being continuous with opposite side edges of the steel plate and formed on a same side as the steel-plate front face. 
     
     
         16 . The repair and strengthening system for a reinforced concrete structure of  claim 2 , wherein:
 the steel plate is bent into a U-shape in section that includes a bottom portion and a pair of side portions;   a bar member is installed to penetrate a structure through-hole formed in the reinforced concrete structure; and   as the bar member penetrates the openings, the steel plate is secured onto the reinforced concrete structure.   
     
     
         17 . The repair and strengthening system for a reinforced concrete structure of  claim 1 , wherein the steel plate is made of plain steel, high tension steel, stainless steel, or weathering steel. 
     
     
         18 . The repair and strengthening system for a reinforced concrete structure of  claim 1 , wherein the filler is mortar, shrinkage-compensating mortar, polymer cement mortar, resin mortar, fiber reinforced concrete, superplasticized concrete, high-strength concrete, an epoxy resin injection material, a polyurethane resin injection material, or a sodium silicate injection material.