Steel pipe for reinforcing ground, method of reinforcing ground using the same, and method of reinforcing structure

Abstract

A steel pipe ground reinforcement of the present invention is driven into a ground and injects a grouting material into the ground. The steel pipe ground reinforcement includes: a recess portion and a smooth portion that are arranged on an outer peripheral surface thereof; and a plurality of through-holes that are arranged in the recess portion or the smooth portion that communicates between the inside and outside of the steel pipe ground reinforcement.

1 . A steel pipe ground reinforcement that is driven into a ground and injects a grouting material into the ground, the steel pipe ground reinforcement comprises:
 a recess portion and a smooth portion that are arranged on an outer peripheral surface thereof; and   a plurality of through-holes that are arranged in the recess portion or the smooth portion that communicates between an inside and an outside of the steel pipe ground reinforcement.   
     
     
         2 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein the recess portion has a cross-sectional shape with a depth of the recess portion of 0.005 D to 0.2 D and a width of the recess portion of 0.015 D to 2D where D is an outer diameter of the steel pipe, and   wherein the recess portion has a triangular shape in cross-section, and B/H=3 to 20 where B is the width of the recess portion and H is the depth of the recess portion.   
     
     
         3 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein the recess portion has a cross-sectional shape with a depth of the recess portion of 0.005 D to 0.2 D and a width of the recess portion of 0.015 D to 2D where D is an outer diameter of the steel pipe, and   wherein the recess portion has a rectangular shape in cross-section, and B/H=4 to 20 where B is the width of the recess portion and H is the depth of the recess portion.   
     
     
         4 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein the recess portion has a cross-sectional shape with a depth of the recess portion of 0.005 D to 0.2 D and a width of the recess portion of 0.015 D to 2D where D is an outer diameter of the steel pipe, and   wherein the recess portion has a semicircular or trapezoidal shape in cross-section, and B/H=3 to 20 where B is the width of the recess portion and H is the depth of the recess portion.   
     
     
         5 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein a plurality of the recess portions are provided on a same periphery of the steel pipe.   
     
     
         6 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein a plurality of the recess portions are provided in a circumferential direction of the steel pipe, and   wherein at least the recess portions that face each other are provided so as to avoid being on a same periphery of the steel pipe.   
     
     
         7 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein a plurality of the recess portions are provided diagonally with respect to an axis of the steel pipe.   
     
     
         8 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein a plurality of the recess portions are provided in parallel with respect to an axis of the steel pipe.   
     
     
         9 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein a plurality of the recess portions are provided in a circular shape when seen from front.   
     
     
         10 . The steel pipe ground reinforcement according to  claim 1 ,
 wherein plating or resin coating is provided on the surface of the steel pipe.   
     
     
         11 . A method of reinforcing a ground, comprising:
 when reinforcing a ground, driving the steel pipe ground reinforcement according to  claim 1  while drilling the ground; and   after driving of the steel pipe ground reinforcement, injecting a grouting material into an inside of the steel pipe ground reinforcement to thereby inject the grouting material into an outside of the steel pipe ground reinforcement through the plurality of through-holes.   
     
     
         12 . The method of reinforcing a ground according to  claim 11 ,
 wherein a minimum inner diameter of the steel pipe ground reinforcement is larger than an outer diameter of an inner bit that is used when the ground is drilled.   
     
     
         13 . The method of reinforcing a ground according to  claim 11 ,
 wherein a maximum outer diameter of the steel pipe ground reinforcement is smaller than an outer diameter of an outer bit that is used when the ground is drilled.   
     
     
         14 . A method of reinforcing a structure including concrete, comprising:
 when reinforcing a structure, driving the steel pipe ground reinforcement according to  claim 1  while drilling the structure; and   after driving of the steel pipe ground reinforcement, injecting a grouting material into an inside of the steel pipe ground reinforcement to thereby inject the grouting material into an outside of the steel pipe ground reinforcement through the plurality of through-holes.