Diaphragm wall and this construction technique

摘要

According to the present invention, after excavating the trench by a temporary earth wall method having an intermediate function between a Soil Cement Wall (SCW) method and an underground continuous wall (Slurry Wall), the trench hollow wall is maintained using a bentonite stabilizer, and the steel pile is in the trench. After inserting the low strength concrete, the underground continuous wall is constructed, and it has excellent degree of stiffness and the rigidity of the cross section. The purpose of the present invention is to provide a continuous ground wall and its construction method which are safe in the worst ground conditions because of excellent workability, easy verticality management, and excellent access and water tightness. The underground continuous wall construction method according to the present invention for achieving the above object comprises the steps of: (I) to form a shallow trench by excavating the ground at a predetermined position and the predetermined position for the underground continuous wall construction; Installing the formwork at regular intervals on both sides of the shallow trench, placing reinforcement to the formwork, and placing and curing concrete to form guide walls (II); Excavating the inner wall of the guide wall to have a predetermined depth downward to form a deep trench (III); (IV) installing a grating-shaped guide frame on the shallow trench; Assembling a steel pile consisting of a plurality of H beams (V); Inserting a steel file into a deep trench in the guide frame (VI); (I) inserting a trailing tube into a shallow trench into which the steel pile is inserted; It is characterized by constructing a continuous underground wall by sequentially performing the step (Ⅷ) of placing and curing low-strength concrete in a deep trench using the tremi tube. In addition, the underground continuous wall according to the present invention for achieving the above object is characterized in that it was constructed by the underground continuous wall construction method of claim 1.