Brush-type packing means for shield excavator
AssigneeTekken Kensetu Co. Ltd.
InventorHironobu Yamazaki
Life of this patent
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Abstract
A brush-type packing means for shield tunnel excavators which is high in wear resistance and shielding effect against underground water is provided. The packing means comprises at least two rows of resilient wire brushes secured substantially in parallel ring shape along inner periphery of substantially cylindrical excavator body adjacent its tail end or peripheral edge of tunnel entrance on wall surface of vertical shaft as spaced in tunnelling direction to close a gap space between the tail end or the entrance edge and peripheral surface of tunnel wall element inserted in excavated tunnel, and the space between the respective rows of the wire brushes is sealed with a material which is viscous and impermeable to water.
Claims8
A brush-type packing means for a shield tunnel excavator comprising at least two rows of substantially ring-shaped wire brushes respectively made of wires bunched and having a high resiliency and wear resistance and spaced in the longitudinal direction of said excavator providing substantially an annular space therebetween each said ring-shaped brush being secured along the inner periphery of a substantially cylindrical excavator body adjacent the tail end thereof and projected inward at its free end, means for securing said brushes to a position for closing a gap between tunnelled ground surface and peripheral surface of a tunnel wall element inserted in excavated tunnel, and a viscous sealing material impermeable to water and substantially filled in said annular space, said sealing material having a fluidity suitable for permeating into clearances between respective wires of said brush but not passing through the brush.
Dependencies are inferred from the claim text.