To discharge spring water excellently, and to prevent the penetration of spring water into a basement by constituting the sidewall of an underground structure of a spring draining material consisting of foamed-particle molded forms having a specific shape manufactured by molding cylindrical synthetic-resin foamed particles.
The sidewall of a basement 1 is composed of the spring draining material 2, a waterproof layer 3 and a building frame 4 made of concrete in order from the outside, and a drainage means such as a culvert 6 is installed to the lower section of the spring draining material 2. The spring draining material 2 consists of foamed-particle molded forms being manufactured by molding synthetic-resin foamed particles such as a cylindrical polyolefin resin and having communicated voids, and abounds in compressive strength, water permeability and drainage properties, and bulk density is set in 0.03-0.20g/cm3, 5% compressive strength in 0.8kg/cm2 or more, the coefficient of permeability in 1×10-2 to 4×10-1cm/sec and thickness in 25mm or more. Since the spring draining material 2 is difficult to be damaged at the time of the back filling of soil and sand and spring water is dained excellently, water pressure applied to the external wall of the building frame 4 made of concrete can be reduced. The waterproof layer 3 is not damaged and has superior waterproofness, and can improve the waterproofness of the basement extremely.
EGUCHI TAKAAKI
SUDO YOSHIMI
HASHIBA MASAHIRO
Next Patent: ILLUMINATOR IN MANHOLE AND LIFTING-LOWERING TOOL IN MANHOLE