| 摘要 |
PURPOSE:To prevent the slackening and coming-off of main frame from connectors by loading of covering soil by a method in which a projected lever is provided to the downside of the cover of a connector connecting the main frames in a hatched form, and holes are projectionally provided in the connector of the main frame. CONSTITUTION:The upper vertical wall 4 of the main body of a main frame 2 is cut off on both ends of the main frame 2, and a hole 65 is instead drilled in the upside of the main body 3. Also, projected levers 66 are formed on the downside of the cover 13 of a connector to connect the main frames 2 in a hatched form. The main frames 2 are placed crosswise on a slope, the cover 13 is made to cover the main frames 2, and the projected levers 66 of the cover 13 are inserted into the holes 65 of the main frames 2. The main frames 2 can thus be prevented from slackening and separating from the connector 2 even when burdened with covering soil. |
