MID-PUSHING OF PIPE FOR PROPULSIVE EXCAVATION

摘要

PURPOSE:To safely and exactly transmit propulsive forces while protecting inner layer by a method in which an auxiliary plate is attached to the inner surface of the end of an outer layer of a pipe in which an anticorrosive inner layer is connected with a high-strength outer pipe by an intermediate pipe for propulsive excavation work. CONSTITUTION:Anticorrosive inner layers 2 are connected with high-strength outer layers 3 by intermediate layers 4 to make up pipes 1A and 1B capable of transmitting propulsive forces by the layers 3 for propulsive excavation work. Auxiliary plates 5, 8 and 9 are attached to the inner surface of the ends of the layers 1 for reinforcing the ends of the layers 3. A mid-push jack 12 is detachably set between the adjacent pipes 1A and 1B and the pipe 1A in front is advanced for stepwise proceeding of pipe laying work.