DYNAMIC PRESS-IN JACKING METHOD AND JACKING DEVICE FOR USE THEREIN

摘要

PROBLEM TO BE SOLVED: To provide a dynamic press-in jacking method capable of burying a pipeline using jacking method by the pressing-in of pipes without discharge of sediment even in the case of hard ground, and a jacking device for use therein. SOLUTION: The dynamic press-in jacking method includes pressing and jacking a leader 4 having a tip head 12 at its tip into the ground 1 using a pushing device 3 installed in a starting shaft 2, and causing a jacking pipe 5 to follow the leader without discharging sediment. The tip head 12 can be vibrated by a vibration generator mounted in either the leader 4 or the pushing device 3. The tip head 12 is vibrated in the longitudinal direction parallel to jacking direction to impart a predetermined vibration acceleration to the ground 1. The shearing strength of the ground 1 is reduced by the vibration acceleration to fluidize earth grains of the ground 1 near the tip head 12 so that the ground is excavated while resistance at the front face of the tip head 12 is reduced to a maximum. Thus, the method enables the pipes to be pressed in without discharge of sediment up to an N value of about 30.