Portal frame for trench box stack

Details Portal frame for trench box stack Portal frame for trench box stack

1976-10-12

1978-05-23

Taylor, Dennis L.

61105, E21D 500

Patent

active

040903656

ABSTRACT:
A portal frame attached to the open end of a trench box structure and assembling and rigidifying the stacked plural boxes forming the smooth wall sides of the consequent trench box whereby side sections or panels of trench boxes are stackably adjustable as to depth or trench served and the portal span provides maximum clearance for the pipe.

REFERENCES:
patent: 1768146 (1930-06-01), Ramey
patent: 2633713 (1953-04-01), Shields
patent: 2777294 (1957-01-01), Rosa et al.
patent: 3212270 (1965-10-01), Benintend
patent: 3782126 (1974-01-01), Pavese
patent: 3992887 (1976-11-01), Fisher

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