ARRIVAL STRUCTURE FOR EXCAVATOR

摘要

PROBLEM TO BE SOLVED: To provide an arrival structure for an excavator, wherein no element exists inside an arrival shaft without the need for soil improvement of natural ground. SOLUTION: The arrival structure works in a first step of using a main pusher for pushing out a leading conductor 20 and a guide pipe 21 connected thereto up to the arrival shaft 2 and in a second step of connecting the excavator 22 to the tail end of the guide pipe 21 and using the main pusher for pushing out the excavator 22 and an embedded pipe 25 connected thereto to make the excavator 22 to arrive at the arrival shaft 2. It comprises a wall 4 formed of a material usable for excavation with the leading conductor 20 and a cutter 23 of the excavator 22 and mounted on the arrival shaft 2 at its outside to cover an arrival port 3 formed opening to the side wall of the arrival shaft 2 for stopping water from the arrival port 3 against the side pressure of the natural ground and a seal member 5 mounted on the wall 4 and fitted to the leading conductor 20 and the guide pipe 21 in the first step for stopping water from outer peripheral portions thereof and fitted to the excavator 22 and the embedded pipe 25 in the second step for stopping water from outer peripheral portions thereof. COPYRIGHT: (C)2005,JPO&NCIPI