Mining or in situ disintegration of hard material – Processes – Forming blocks
Patent
1975-03-26
1976-12-21
Shapiro, Jacob
Mining or in situ disintegration of hard material
Processes
Forming blocks
299 31, E01G 304
Patent
active
039980677
ABSTRACT:
An improved shoring machine for tunnel construction in which a load-bearing structure provided with shores for shaping and shoring up the tunnel is supported on skids with the structure supported on the skids and shores, the skids being guided for vertical and horizontal movement and having wings, portions of which have matching holes arranged in overlapping relationship together with a beam having a bottom surface located in the space between each pair of skids and provided with a plurality of teeth arranged to be accommodated within said holes, the teeth being long enough to serve an anchoring elements on the tunnel floor when projecting through the holes to facilitate the advance of the frame and to permit changes in the direction of movement of the frame to the right or left, the beam being pivoted at its front end on one pair of skids about a transverse axis and the beam having a back end connected through a hydraulic cylinder to the load-bearing structure with the hydraulic cylinder being arranged to retract said teeth upon raising of said beam.
REFERENCES:
patent: 3581507 (1971-06-01), Stevens
patent: 3870368 (1975-03-01), Winberg
Mackina Westfalia, S.A. & Corsan
Shapiro Jacob
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