Basic bottom permanent drainage structure using trench and drainage member and it's construction method

摘要

A base bottom permanent drainage structure using a trench and a drain member and a construction method thereof are provided to remove uplift pressure acting on an underground floor slab using the drain member and to function the trench as a safety device by primarily collecting infiltrated water to the trench. A base bottom permanent drainage structure using a trench(10) and a drain member(22) is composed of the trench formed by digging out a lower side of a building; a first civil engineering fiber layer(12) formed by primarily paving civil engineering fibers on the bottom surface of the trench; a first pebble layer(14) formed by primarily paving pebbles on the first civil engineering fiber layer; a perforated pipe(16) installed on the first pebble layer; a second pebble layer(18) formed by secondarily paving pebbles on the perforated pipe; a second civil engineering fiber layer(20) formed by secondarily paving civil engineering fibers on the bottom surface of the second pebble layer; the plate-shaped drain member mounted on the second civil engineering fiber layer; and a film layer(24) disposed on the plate-shaped drain member and paved with polyethylene.