Shielded tunnel excavator

Details Shielded tunnel excavator Shielded tunnel excavator

1987-11-10

1989-02-14

Taylor, Dennis L.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

299 31, 405138, 405146, E21D 906

Patent

active

048042951

ABSTRACT:
A tunnel excavator has a substantially tubular shield having rotatably mounted on one end a motor-driven cutting disk rotatably carrying a multiplicity of roller cutters. The shield is comprised of a head section having front anchors in addition to the cutting disk, an inner section telescopically nested in the head section and constrained to only axial displacement relative to the same, and a tail section having rear anchors and coupled to the inner section for both bending and rolling movements relative to the same. Hydraulic push jacks act between the head and tail shield sections for advancing the shield. A pair of hydraulically independent antirolling jacks are connected between the inner and tail shield sections so as to enable the tail shield section, which is anchored during excavation, to bear against the rolling of the head shield section.

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