Abstract: A method and apparatus for forming a trench with grates or solid covers, comprising an outer shell which is disposed between opposed frame members at a certain position within a ditch and an inner core that is received within a channel in the shell. The core aids in providing rigidity to the shell while concrete hardens about the outer surface of the shell. Rods are vertically driven through the core and the outer shell into the bottom of the trench to stabilize the forms while the concrete or other setting material is poured into the trench. The rods are removed before the material hardens. After the encasing material sets, the core can be removed from the shell which then enables the shell to be more easily displaced from the formed trench.

Abstract: A method and apparatus for forming a trench with grates or solid covers comprising an outer shell which is disposed between opposed frame members at a certain position, within a ditch and an inner core that is received within a channel in the shell. The core aids in providing rigidity to the shell while concrete hardens about the outer surface of the shell. After the concrete or other encasing material sets, the core can be removed from the shell which then enables the shell to be more easily displaced from the formed trench. One end of a core can project outwardly from an end of its shell so as to be received within the space formed in the rear of the channel of an abutting shell which, likewise, has its core projecting beyond its front end wall, thereby helping to align the shells within the trench.

Abstract: A system for forming a multi-walled trench comprising an outer wall, an inner wall disposed within the outer wall and along which the fluid to be contained flows, means for securing in position the inner wall so as to allow expansion and contraction thereof relative to the outer wall and means for vertically adjusting the trench relative to the surface elevation prior to the pouring of concrete. Various embodiments of the securing means are provided.

Abstract: A system for forming a multi-walled trench comprising a pair of frame members, each having a horizontal section and a section depending from the horizontal section; a holding pan having sidewalls exterior to the depending portion of the frame members, a bottom floor disposed between the sidewalls, and flanges on each sidewall extending parallel to the plane of the horizontal section of the frame member and away from the depending portion; an outer wall disposed within the holding pan having an inside surface and an outside surface, the outside surface of the outer wall engaging at least a portion of the sidewalls and the bottom walls of the holding pan; an inner wall disposed within the outer wall having an inside surface and an outside surface, the inside surface of the inner wall engaging at least a portion of the inner surface of the depending portion of the frame members, and a cavity being formed between the outside surface of the inner wall and the inside surface of the outer wall; means in the cavity f

Abstract: A device for forming a trench having a pair of frame members each having a first adjustment slot therethrough, a form pan having sidewalls, the sidewalls having an adjustment slot in registration with the first adjustment slot of the frame members, and means for adjustably securing the form pan to the frames through the first and second adjustment slots to allow positioning of the form pan relative to the frames.

Abstract: A device for forming a trench having a pair of frame members, connecting rods disposed between the frame members to maintain the frame members in a fixed position relative to each other, anchoring means attached to the frame members for positioning the frame members relative to the ground and a form removably held in a fixed position between the frame members having an upper surface and a shaped lower surface, the shaped lower surface providing means for molding a moldable trench composition into the shape.

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.