| 摘要 |
PURPOSE:To perform excavation which is decreased in outbreak, by a method wherein a lubricant pouring pipe is installed to the central partof a sheathing panel made of copper, and lubricant discharge ports are formed in theouterside of the sheathing panel, a lburicant is poured and discharged from the sheathing panel simultaneously with excavation during press-in of the sheathing panel. CONSTITUTION:A sheathing panel 4 made of copper has a lubricant pouring pipe 13 being verticallyinstalled in a sheating panel and pipes 15 which are brancdhed from the lubricant pipe 13 and communicated with lubricant discharge ports 17 and 18 open to the outer side of a panel body 10. The sheathing panel 4 may be formed in a box shape in that a pair of the sheating panels 4 are coupled by means of struts. When the sheating panel 4 is pressed in by a hydraulic jack simultaneously with excavation, a lubricant, such as bentonite muddy water, is discharged, and press-in motion is easy to make. Meanswhle, during pull-off also, the lubricant is discharged, pull-off is facilitated. This enables to perform highly-efficiency excavation without excavation outbreak. |
