Method of Reinforcing a Hollow Part Which Is Formed in an Earth and Sand Ground at a Rear Side of Retaining Wall

Abstract

A method of reinforcing a hollow part which is formed in an earth and sand ground at a rear side of retaining wall by a revetment work is disclosed. The method of reinforcing a hollow part which is formed in an earth and sand ground at a rear side of retaining wall by a revetment work, the method including: forming a base hole by excavating the earth and sand ground facing to a base bottom surface of the retaining wall by a predetermined depth; forming a support wall by foaming first hard urethane at an inlet of the hollow part formed by the base bottom surface of the retaining wall and lost earth and sand and forming a underwater wall by foaming second hard urethane between the base hole, the support wall, and the base bottom surface of the retaining wall; forming a reinforcing layer by foaming third hard urethane at a upper part of a bottom surface of the hollow part, a upper part of the support wall, and a upper part of a bottom plate of the retaining wall; forming a urethane and crushed stone layer by using alternatively crushed stones and fourth hard urethane at a upper part of the reinforcing layer; and forming an impact relieving layer by using fifth hard urethane between a road formed at a upper part of the hollow part and the urethane and crushed stone layer. Therefore, it is possible to semi-permanently reinforce a hollow part which is formed in an earth and sand ground at a rear side of retaining wall within a short work period.

1 . A method of reinforcing a hollow part which is formed in an earth and sand ground at a rear side of retaining wall by a revetment work, the method comprising:
 forming a base hole by excavating the earth and sand ground facing to a base bottom surface of the retaining wall by a predetermined depth;   forming a support wall by foaming first hard urethane at an inlet of the hollow part formed by the base bottom surface of the retaining wall and lost earth and sand and forming a underwater wall by foaming second hard urethane between the base hole, the support wall, and the base bottom surface of the retaining wall;   forming a reinforcing layer by foaming third hard urethane at a upper part of a bottom surface of the hollow part, a upper part of the support wall, and a upper part of a bottom plate of the retaining wall;   forming a urethane and crushed stone layer by using alternatively crushed stones and fourth hard urethane at a upper part of the reinforcing layer; and   forming an impact relieving layer by using fifth hard urethane between a road formed at the upper part of the hollow part and the urethane and crushed stone layer.   
     
     
         2 . The method of  claim 1 , further comprising forming a coloring layer by coating urethane primer on an outside surface of the underwater wall;
 forming a urethane paint layer by coating urethane paint on the coloring layer; and   forming a sand layer by coating sand on the urethane paint layer.   
     
     
         3 . The method of  claim 1 , wherein the reinforcing layer and the urethane and crushed stone layer are formed in a V-shape. 
     
     
         4 . The method of  claim 1 , wherein density of the first hard urethane is 250 kg/m 3 , density of the second urethane is 500 kg/m 3 , density of the third urethane is 80 kg/m 3  to 100 kg/m 3 , density of the fourth urethane is 300 kg/m 3 , and density of the fifth urethane is 60 kg/m 3 .