SHIELD TUNNEL CONSTRUCTION METHOD AND SHIELD TUNNEL EXCAVATOR

摘要

PROBLEM TO BE SOLVED: To simply and effectively use excavated soil produced when a tunnel is constructed by a shield tunneling method. SOLUTION: Natural ground is excavated with stabilizing a working face with mud pressure. A mixture of the mud 13 discharged as excavated soil and a solidifying material 17 are used as backfill 18 to an invert part. A mud-water type excavating system 4 for executing excavation with stabilizing the outer circumference of the working face with mud water pressure and a mud pressure type excavating system 5 for executing preceding excavation with stabilizing the central part of the working face with mud pressure are installed, and the mud pressure type excavating system is provided with a mud conveyer means (conveyor pipe 15) for backfilling the mud soil discharged as excavated soil to the invert part. The mud conveyor means is provided with a mixing stirring vessel 16 for mixing the mud soil and the solidifying material and stirring the mixture. The excavation area of the central part of the working face by the mud pressure type excavating system is set so that the quantity of the excavated soil discharged from the mud pressure type excavating system becomes equivalent to the quantity of the backfill backfilled to the invert part. COPYRIGHT: (C)2005,JPO&NCIPI