초록 ▼

An apparatus for covering a ditch includes a cover and girders having rabbets with projecting edges and flat-lying edges, the cover being placed on the rabbets. The apparatus has, before it is set up, a configuration for installation including one or several bars passing through lower webs of the gi

An apparatus for covering a ditch includes a cover and girders having rabbets with projecting edges and flat-lying edges, the cover being placed on the rabbets. The apparatus has, before it is set up, a configuration for installation including one or several bars passing through lower webs of the girders and fixed to the girders and to the cover to maintain their final configuration, and level adjusting screws in edges of the girders defining a polygon providing stable support.

대표청구항 ▼

The invention claimed is: 1. An apparatus for covering a ditch comprising: first and second main beams having respective first and second rabbets, respective first and second upright edges bordering and defining the respective rabbets, and first and second flanges bordering first and second upright

The invention claimed is: 1. An apparatus for covering a ditch comprising: first and second main beams having respective first and second rabbets, respective first and second upright edges bordering and defining the respective rabbets, and first and second flanges bordering first and second upright edges, respectively, and transverse to the first and second upright edges; a cover having first and second generally parallel and opposite edges, the cover being supportable at the first and second opposite edges on the first and second rabbets, respectively, of the first and second main beams when arranged parallel to one another, the first and second main beams having respective first and second lower webs that extend opposite the first and second rabbets, respectively, and include respective first and second holes; at least a first bar for passing through the respective first and second holes to maintain the first and second main beams and the cover in fixed relative positions during placement of the cover over, and covering a ditch; and at least three level-adjustment screws engaging the first and second flanges of the first and second main beams and defining a support polygon. 2. The apparatus according to claim 1, including a second bar, spaced from the first bar, for passing through third and fourth holes in the first and second lower webs, and attachable to the first and second main beams for maintaining the first and second main beams and the cover in the fixed relative positions during placement of the cover over, and covering a ditch. 3. The apparatus according to claim 1, wherein the first and second flanges and the rabbets of each of the first and second main beams are coplanar. 4. The apparatus according to claim 1, including a first pair of level-adjustment screws engaging respective ends of the first flange, and a second pair of level-adjustment screws engaging respective ends of the second flange. 5. The apparatus according to claim 1, including a respective threaded sleeve inserted between each of the level-adjustment screws and the first and second main beams engaged by the level-adjustment screws. 6. The apparatus according to claim 2, including, for each of the first and second bars, a respective holding bolt for engaging an opening in the cover and a hole in the respective bar. 7. The apparatus according to claim 1, including carriers straddling an upright edge of each of the first and second main beams and inserted between the first and second main beams and the cover. 8. A process for the installation of the apparatus according to claim 1, over a ditch having first and second generally parallel walls, the process comprising putting down the first and second main beams on the first and second walls, the lower webs being inserted with slight play between the walls, manipulating the leveling screws to fix the cover at a level with respect to the walls, and depositing, on both sides of the first and second main beams, a layer of a covering material that covers the walls to the first and second lower webs, burying the leveling screws covering the flanges of the first and second main beams, and hiding the first and second upright edges. 9. An apparatus for covering a ditch comprising: first and second main beams having respective first and second rabbets, respective first and second upright edges bordering and defining the respective rabbets, and first and second flanges bordering first and second upright edges, respectively, and transverse to the first and second upright edges; a cover having first and second generally parallel and opposite edges, the cover being supportable at the first and second opposite edges on the first and second rabbets, respectively, of the first and second main beams when arranged parallel to one another, the first and second main beams having respective first and second lower webs that extend opposite the first and second rabbets, respectively, and include respective first and third holes and second and fourth holes; a first bar for passing through the respective first and second holes to maintain the first and second main beams and the cover in fixed relative positions during placement of the cover over, and covering ditch; a second bar, spaced from the first bar, for passing through the respective third and fourth holes, and attachable to the first and second main beams for maintaining the first and second main beams and the cover in fixed relative positions during placement of the cover over, and covering a ditch, each of the first and second bars having first and second ends for attachment to the first and second flanges with respective first and second attachment screws; and at least three level-adjustment screws engaging the first and second flanges of the first and second main beams and defining a support polygon. 10. The apparatus according to claim 9, wherein the first and second flanges and the rabbets of each of the first and second main beams are coplanar. 11. The apparatus according to claim 9, including a first pair of level-adjustment screws engaging respective ends of the first flange, and a second pair of level-adjustment screws engaging respective ends of the second flange. 12. The apparatus according to claim 9, including a respective threaded sleeve inserted between each of the attachment screws and the first and second main beams engaged by the screws. 13. The apparatus according to claim 9, including, for each of the first and second bars, a respective holding bolt for engaging an opening in the cover and a hole in the respective bar. 14. The apparatus according to claim 9, including carriers straddling an upright edge of each of the first and second main beams and inserted between the first and second main beams and the cover. 15. A process for the installation of the apparatus according to claim 9, over a ditch having first and second generally parallel walls, the process comprising: putting down the first and second main beams on the first and second walls, the lower webs being inserted with slight play between the walls; manipulating the leveling screws to fix the cover at a level with respect to the walls; depositing, on both sides of the first and second main beams, a layer of a covering material that covers the walls to the first and second lower webs, burying the leveling screws, covering the flanges of the first and second main beams, and hiding the first and second upright edges; and after setting the layer of covering material, detaching the cover from each of the first and second bars and cutting and removing each of the first and second bars proximate each of the first and second lower webs.