Patent ID: 6536181
Filing Date: 2003-03-25
Classification: E02D

Abstract:
A method for building an underground structure capable of utilizing a part of a permanent structure as a strut for earth construction at a location where a building, having a pillar and a lowermost part, is installed, comprising the steps of:driving in an H-section steel pile on a boundary line at which the building is installed; driving in a center pile on a position where the pillar of the building is installed; carrying out a primary excavating work; coupling the H-section steel pile with a concrete retaining wall by means of a fixing shear connecting means, thereby constructing an underground composite retaining wall; installing a girder to be used as a part of a permanent structure on the composite retaining wall by means of an embedded plate and assembling and disposing the girder to the center pile; and carrying out a secondary excavating work and repeating the steps after the primary excavating work until the earth is excavated up to the lower most part of the building.