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

1978-09-05

Taylor, Dennis L.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

E01G 516

Patent

active

041109929

ABSTRACT:
A brush-type packing means for shield tunnel excavators which is high in wear resistance and sealing effect against under ground water is provided. The packing means comprises a resilient wire brush secured substantially in a ring shape along the inner periphery of a substantially cylindrical excavator body adjacent its tail end or the peripheral edge of the tunnel entrance on the wall surface of the vertical shaft to close a gap space between the tail end or the entrance edge and the peripheral surface of a tunnel wall element inserted in an excavated tunnel, and clearances between respective brush wires are sealed with an impregnating agent which is deformable 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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