Brush-type packing means for shield excavator

Details Brush-type packing means for shield excavator Brush-type packing means for shield excavator

1976-05-25

1977-11-15

Taylor, Dennis L.

61 42, E01G 516

Patent

active

040579719

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.

REFERENCES:
patent: 646354 (1900-03-01), Buel
patent: 723986 (1903-03-01), Carson
patent: 3410098 (1968-11-01), Winberg
patent: 3979920 (1976-09-01), Burgess et al.

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