CONSTRUCTION METHOD OF UNDERGROUND STRUCTURE

• Main Authors: UEMURA KENJIRO, NAKAMURA TOMOYA, UEMURA MAKOTO, MARUTA SHINICHI
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2018
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

PROBLEM TO BE SOLVED: To provide a construction method of an underground structure applicable to a water retaining layer through improving a construction method (SFT construction method) of an underground structure, which is to push out sediment in a working face together with box type roofs to advance a concrete box body after the box type roofs are pressed-in.SOLUTION: A construction method of an underground structure comprises: placing a friction cut plate on an outer side surface to apply its weight; assembling and positioning in rectangular arrays on a lower layer, side layers, and an upper layer corresponding to the outer configuration of a concrete box body of which box type roofs are advanced by pressed-in in the ground integrally with the friction cut plate; and pushing out sediment within rectangular arrays of box type roofs together with the rectangular arrays of box type roofs, remaining the friction plate as the box body advances and is tracked, which are positioned such that a tip of the box body is arrayed with an edge of the box type roof after the box type roofs are pressed-in to the ground, wherein a cut-off structure is configured by overlapping side ends of the corresponding friction cut plates.SELECTED DRAWING: Figure 1 【課題】箱形ルーフを圧入後、コンクリート函体を推進させるのに、函体の推進とともに切羽部の土砂を箱形ルーフと一緒に押し出す地下構造物の施工法（ＳＦＴ工法）に改良を加え、滞水地盤も対応できる地下構造物の施工法を提供する。【解決手段】外側面にフリクションカットプレートを重置きし、このフリクションカットプレートごと箱形ルーフを地中に圧入して推進しようとするコンクリート函体の外形に対応するように下段、側部及び上段の矩形配列に組み配置し、箱形ルーフを地中に圧入した後、前記箱形ルーフ端部に函体の先端部を合わせて函体を配置して函体の推進や牽引とともにフリクションカットプレートを残して、箱形ルーフの矩形配列の内方の土砂を箱形ルーフの矩形配列と一緒に押し出す地下構造物の施工法において、フリクションカットプレートは側端を重ね合わせて止水構造とする。【選択図】図１