To disperse a reinforcing material in sand to increase the frictional coefficient between the sand and the reinforcing material, and prevent distortion of the sand ground to be caused by the weight of a heavy material, by forming the sand ground-reinforcing material having a specified shape in a net structure having voids.
A net structure of a specified sectional shape while a number of continuous weirs made of a thermoplastic synthetic resin polymer having 0.1-1.5mm diameter are longitudinally bent to form loops, and it is cut in a specified length, to mix with the sand ground as a reinforcing material for the sand ground. In each continuous wire, the stuck quantity of the contact points with adjacent wires is 100-4,000g/m2, the void ratio is 20-90%, the bending elastic modulus is 10-15,000kgf/cm2 and it has a constant sectional shape in the longitudinal direction. A longitudinally continuous fin part 4 is arranged at the side of the body 3 to have the fin part with a small rigidity in common. In this way, the net structure serves as a kind of resistant material by mixing with sand to improve the dispersing effect of the reinforcing material. And the reinforcing material is prevented in sand from sliding with external forces to make effective the reinforcement of ground.
USUI YOSHIHARU
CHIMOTO KENJI
