Portal frame for trench box stack

E - Fixed Constructions – 02 – D

Patent

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248/8.5

E02D 5/04 (2006.01) C08G 77/60 (2006.01) E02D 17/08 (2006.01) E02D 29/05 (2006.01)

Patent

CA 1062683

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.

285632

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