| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent falling of a ground traveling type excavator and to restore it from a travel impossible state when performing drilling work using a pneumatic caisson method. <P>SOLUTION: A rail 120 is fixed to the ceiling of a caisson work chamber 10, and a plain trolley 130 is installed to the rail 120. Also, to the ground traveling type excavator 110, an extension pipe 150 is installed. Then, the plain trolley 130 and the extension pipe 150 are connected by a falling prevention chain 140. Further, a winch 170 is installed to the ground traveling type excavator 110 to wind a restoration wire 160 connected to the plain trolley 130. When the ground traveling type excavator 110 is largely inclined, the falling is prevented by the tensile force of the falling prevention chain 140 and the extension pipe 150. When the ground traveling type excavator 110 is largely inclined or the like and becomes impossible to travel, by winding the restoration wire 160 by the winch 170, the ground traveling type excavator 110 is pulled in an upper direction and is made easy to escape from a hole. <P>COPYRIGHT: (C)2012,JPO&INPIT |
