| 摘要 |
METHOD AND APPARATUS FOR FORMING A TRENCH Disclosed is a trench-form for positioning a frame during the construction of a grate covered trench. The trenchform includes a pair of parallel sidewalls upon which the frames are fastened with an upper bracing member for maintaining the upper portion of the sidewalls in parallel position located between and attached to each sidewall at a common vertical position so as to be perpendicular to each sidewall. A lower bracing member further maintains the lower portions of the sidewalls in parallel position and is located between and attached to each sidewall at a common position below upper bracing member. The upper bracing member and the lower bracing member are in parallel position. The invention also comprehends an adjustable frame for maintaining a grate in stable position along a trench, comprising a horizontal grate supporting member with a vertically extending upper contracting member and a sidewall contacting surface extending vertically downward from the bottom surface of the grate supporting member. The invention further comprehends a method of leveling a grate over a grate-covered trench using a trench-form having at least one sidewall upon which the grate supporting frame may be positioned and a first frame for supporting the grate having a sidewall contacting surface having an elongate adjustment slots located thereon for allowing positioning of the frame relative to the sidewall. |
