Trench shoring assembly with lifting attachment

Supports – Pipe or cable – Extending through plate

Patent

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Details

24 37, 248 62, E21D 500

Patent

active

040589838

ABSTRACT:
This invention relates to a trench shoring assembly which includes a pair of spaced apart side walls for vertical disposition within a trench. Spreader pipes and spreader collars interconnect the side walls and allow limited pivotal movement between the wide walls. Each side wall includes outer and inner metal plates connected to a plurality of interconnected structural members which define a main frame. The interconnected structural members include horizontally extending hollow metal beams including a top beam which extends longitudinally along the top of the side wall, two intermediate beams parallel the hollow metal beam and a bottom beam. A hardwood insert is disposed within the top beam to prevent the collapse of the hollow metal beam. Each side wall contains a number of hollow beams extending perpendicularly to the horizontal beams and ribbed members extending perpendicularly to the horizontal beams. These vertical beams and members are interconnected by a strip member. The side walls of the assembly have a tapered bottom portion which defines a triangular shaped pointed lower extremity extending between the ends of the bottom portion. Triangular members are disposed at the ends of the bottom portion to protect the ends from abrasion. A metallic bar is disposed at the pointed lower extremity and extends between the ends of the bottom portion and protects the bottom of the side wall against abrasion. A number of triangularly shaped gusset plates are spaced along the lower extremity and extend downwardly from the horizontally extending bottom beam to a pointed lower end of the lower extremity. The metallic bar is disposed in a notch of the pointed lower ends of the gusset plates. A U-shaped member is welded to the main frame, and, in turn, a spreader collar is welded to the U-shaped member so that a force applied to the spreader collar is transferred directly to the main frame. Each spreader pipe spaces the side walls apart between two spreader collars to which the spreader pipe is attached by spreader pins. The spreader pins extend through a hole extending through the spreader collar and an elongated slot formed through the spreader pipe. The elongated slot is larger than the spreader pin to allow for limited pivotal movement between the overlapping spreader pipe and spreader collar. A pair of horizontally spaced structural brace plates extend vertically between a pair of vertically spaced spreader pipes. Lifting rings are slidably attached to the spreader pipes for lifting the assembly. A plurality of flanges extend from a spreader pipe and are connected by locking pins to mating flanges which extend from another spreader pipe of another vertically stacked trench shoring assembly.

REFERENCES:
patent: 764798 (1904-07-01), Diebitsch
patent: 1730911 (1929-10-01), Bateman
patent: 3520244 (1970-07-01), Gaines, Jr.
patent: 3549190 (1970-12-01), Caldwell
patent: 3824655 (1974-07-01), Hills
patent: 3851856 (1974-12-01), Berg

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