| 摘要 |
A system for forming a single-walled trench comprising a pair of frame members, each having a horizontal section and a section depending from the horizontal section; a collapsing pair of wall pans having sidewalls interior to the depending portion of the frame members, a bottom floor disposed between the sidewalls, a releasing mechanism to collapse inward the sidewalls, a device which collapses the sidewalls inward and removes the entire bottom and sidewalls from the poured trench leaving the frames embedded securely in the concrete; and adjustable anchoring means attached to the frame members for providing vertical adjustment of the frame members relative to the ground and each other, leaving all but the frame members available for re-use. |
