Method and apparatus for stabilizing a trench form during construction

Claim 1

An improved trench form for shaping a trench of the type wherein the form is disposed within a ditch between two frame assemblies, concrete is poured within the ditch to encase the outer surface of the trench form and, after the concrete or other encasing material hardens, the form is removed, the improvement comprising: (a) an elongated, rigid outer shell having upright opposed side walls, a forward end wall and an opposite rear end wall, a top wall and a bottom and having a channel longitudinally extending therethrough which is open through the end walls and the tope walls; and (b) a core that is positioned within and is removable from the channel and having opposed ends, a top and a bottom surface and a shape which is complimentary to the shape of the channel, whereby, after the concrete hardens, the core is removed from the shell and then the shell is removed from the concrete; and (c) means for fixing the position of the shell and the core relative to the trench while the concrete is poured within the ditch, the fixing means being removable from the core and the shell after the concrete is poured.

Claim 5

A method of making a trench, comprising the steps of: (a) forming a ditch in the ground; (b) fixing at a preselected depth within the ditch a trench form comprising an outer shell and a core received within a channel longitudinally extending through the shell; (c) inserting a rod vertically through the core and the shell with the bottom portion thereof extending into the bottom of the trench; (d) pouring concrete or other encasing material into the trench until the material rises to a predetermined level therein; (e) prior to the setting of the concrete, removing the rod from the shell and the core; and (f) pouring concrete or other enclosing material into the trench until it reaches to the top of each frame and is finished.

Claim 6

A method of making a trench, comprising the steps of: (a) forming a ditch in the ground; (b) fixing at a preselected depth within the ditch a trench form comprising an outer shell and a core received within a channel longitudinally extending through the shell; (c) inserting a rod vertically through the core and the shell with the bottom portion thereof extending into the bottom of the trench; (d) pouring concrete or other encasing material into the trench until the material rises to a predetermined level therein; (e) prior to the setting of the concrete, removing the rod from the shell and the core; and (f) pouring concrete or other enclosing material into the trench until it reaches to the top of each frame and is finished.