OPEN SHIELD MACHINE AND METHOD FOR CONSTRUCTING CAISSON FOUNDATION FOR OPEN SHIELD TUNNELING METHOD

摘要

PROBLEM TO BE SOLVED: To obtain a method for constructing a caisson foundation for an open shield tunneling method, which enables the caisson foundation to be safely constructed in a series of steps of the open shield tunneling method while being hardly affected by surroundings and which hardly causes the disorder of the foundation when a concrete caisson is laid by the open shield tunneling method; and to obtain an open shield machine.;SOLUTION: The open shield machine 1, which has a sole plate 1b arranged in such a lower height position as to be located at a lower end of a soft ground layer, is used. In the open shield tunneling method, ground below the concrete caisson 4 is excavated to a depth greater than the installation depth of the concrete caisson 4; the open shield machine 1 excavates by the dimensions of the one concrete caisson 4; and subsequently, this excavated section is soil-improved by foundation crushed stone and a backfill grouting material, so that the caisson foundation 12 can be constructed below a location where the concrete caisson is to be laid.;COPYRIGHT: (C)2011,JPO&INPIT