Segment and tunnel covering works manner null for tunnel covering works

摘要

PURPOSE:To improve strength of a joint part, water cut-off property, and workability, in a steel concrete composite segment constituted by forming a segment ring out of only a steel shell, and then filling concrete therein. CONSTITUTION:An opening part 7 is provided on the rear face of a steel shell constituting a composite segment on which jack thrust is not applied. The steel shell is provided with a partition wall 41 dividing the inner space of the segment into a front space part 42 and a rear space part 43 inside the shell. Further, a through hole 44 is provided on a steel plate 2 on the natural ground side, so as to put poured backfilling material into the rear space part 43. The backfilling material is extended over from the opening part 7 to the joint position between rings, and hence strength and water cut-off property of the joint between the rings as tunnel linings are insured.