Construction manner null of tubed wall for covering works of excavation

摘要

PURPOSE:To make an operation efficient in the segment covering work of vertical dual excavated holes by supporting the portion between branching segments with a bar type supporting body and installing a floor plate forming form and forming the floor plate of plural lines of covering bodies at a time. CONSTITUTION:Vertical dual excavated holes are covered with ordinary segments 2 and branching segments 4, 5 while being continuously linked in the axial direction. Then, the portion between the connecting end faces 4a, 4b of the branching segments 4, 5 is supported by a bar type supporting body. When a plurality of cylindrical wall bodies A are linked, a floor-7 forming form is installed and concrete is placed in the form to form a floor plate 7.