Method and apparatus for forming a trench

Details Method and apparatus for forming a trench Method and apparatus for forming a trench

1987-10-02

1991-02-19

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

249 10, 405118, E02B 500

Patent

active

049938770

ABSTRACT:
A method and apparatus for constructing a grate or solid covered trench is provided, having a "Z" type frame made positionally adjustable by an adjustment slot and fastening means combination, and a trench-form construction achieving stability by means of a number of box-shaped bracings positioned along the trench-form sidewalls. The positions of the bracings are staggered to provide both a supporting surface to the frame and stability to the lower regions of the sidewalls.

REFERENCES:
patent: 786305 (1905-04-01), McIntyre
patent: 1562780 (1925-11-01), Mickelson
patent: 2938437 (1960-05-01), Daley
patent: 3299785 (1967-01-01), James
patent: 3362167 (1968-01-01), Ward
patent: 3625011 (1971-12-01), Stevenson
patent: 4472078 (1984-09-01), Karbstein

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