CURVE JACKING OF PRE-STRESSED CONCRETE HALVED JACKING PIPES

Abstract

The pre-stressed concrete halved jacking pipe is the special production that allows using to a pipe jacking work of which the pipe internal diameter is over 3000 mm. Before real curve jacking is carried out, the technical studies that includes limit curve radius, jacking pipe fit length, and allowable thrust force are required in oeder to keep pipes' smooth advamce. In addition, the structural feature that the pipe has two radial joints is required to maintain sufficient safety by examining the joint movement acted loads during jacking. Accordingly, some technical studies were tried in compliance with Japanese Sewage Works Association Standard, and the results of model pipe jacking tests on the S-shaped plane curve alignment were rearranged. As the result, general knowledge has been obtained to the applicability for a real pipe jacking project with plane curve line.