INCREASE OF DRAINING QUANTITY IN DRAINING BORING

摘要

PPROBLEM TO BE SOLVED: To provide a reduction method for underground water level by forcible draining a draining boring for preventing landslide. PSOLUTION: Underground water in a landslide area or the like is forcibly drained by a spiral pipe (17) by making use of the flowing energy of the underground water (14) drained from a drain pipe (9) to lower the underground water level (32) and stabilize a slope face. PCOPYRIGHT: (C)2004,JPO