Microtunneling systems and methods of use

Details Microtunneling systems and methods of use Microtunneling systems and methods of use

2006-07-04

2006-07-04

Bagnell, David (Department: 3672)

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

C175S171000, C175S094000, C175S113000, C405S184400, C405S184500

Reexamination Certificate

active

07070359

ABSTRACT:
A tunneling system including a tunneling apparatus including a cutting structure for forming a borehole and at least one linkage section for transmitting a force generally toward the cutting structure is disclosed. A method of disposing a casing string within a subterranean formation by applying a force generally to the trailing end of the tunneling apparatus, generally toward the leading end thereof, but without transmitting the entire force through the entire casing string is also disclosed. At least one linkage section extending within but not in contact with at least one casing section of the casing string may transmit the force. Also, a force limiting member may limit a force applied to the casing string.

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“Tunneling with Segments Made of Polymer Concrete,” Amitech America, Lakewood, OH, date unknown, 4 pages.

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