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    • 67. 发明专利
    • SHIELD EXCAVATING METHOD
    • JPH07133698A
    • 1995-05-23
    • JP30353293
    • 1993-11-09
    • TAISEI CORP
    • NAGURA KATSUHIROTANAKA HIDEOKOBAYASHI SADAO
    • E21D9/06
    • PURPOSE:To enhance the prevention of air leakage and to facilitate the postprocess for excavated muck by pressurizing air in an air pressurizing part while continuously forming an air leakage preventing layer made of fibrous materials or water-absorbable and adhesive polymeric materials at the working face during excavation. CONSTITUTION:In a shield excavation, a planar molding part made of natural fibers such as cotton or the like, synthetic fibers such as polypropyren, paper, cloth or the like, is used at a working face 10 of excavation. Further, high water absorbable polymeric materials such as oxidized starch, or synthetic polymer based water-soluble polymer materials such as acrylamide are used as the water absorbable polymeric materials. Further, the water absorbable polymeric materials having polymer which is partly cross-linked, are fed so as to previously graft into fibers in order to form integrated adhesive polymeric material graft fibers or the like which are then formed into an air-leakage preventing layer 11. Further, it is mingled into air so as to be fed under pressure to the working face 10, and is sprayed in an atomized condition as necessary. Accordingly, the air leakage preventing layer 11 is continuously formed making close-contact with the working face 10 while the ground is excavated.