E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
262/78
E21C 25/16 (2006.01) E21C 29/02 (2006.01) E21D 9/10 (2006.01) E21D 9/11 (2006.01)
Patent
CA 1214797
- 53 - ABSTRACT OF THE DISCLOSURE A tunnel boring machine for controlled boring of an elongated curvilinear tunnel in earthen strata. The tunnel boring machine comprises: cutting means for engaging the tunnel face and removing material therefrom to elongate the tunnel during a cutting stroke; elongated body means for supporting various machine components; elongate thrust arm means for urging the cutting means against the tunnel face during a cutting stroke and for advancing the elongated body means along the tunnel between cutting strokes, the thrust arm means being extendable and retractable from the body means along a thrust arm axis coaxial a machine longitudinal axis; forward lateral positioning means operably mounted on a forward portion of the body means for selectively controlling the lateral positioning of a forward portion of the body means within the tunnel; rear lateral positioning means operably mounted on a rear portion of the body means for selectively controlling the lateral positioning of the rear portion of the body means within the tunnel; forward transverse positioning means operably mounted on a forward portion of the body means for selectively controlling the transverse positioning of a forward portion of the body means within the tunnel; rear transverse positioning means operably mounted on a rear portion of the body means for selectively controlling the transverse positioning of the body means within the tunnel; whereby the machine longitudinal axis is selectively transversely and/or laterally positionable relative the longitudinal axis of the tunnel through the use of the forward and rear lateral positioning means and the forward and rear transverse positioning means, and tunnel gripping means operably mounted on the body means for selectively grippingly engaging the peripheral sidewall of the - 54 - tunnel to prevent rearward movement of the body means during a cutting stroke. Various methods of operation of the machine are described.
445768
Harrison Western Corporation
Mcfadden Fincham
LandOfFree
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