| 摘要 |
PURPOSE:To raise the accuracy of an underground vertical cylindrical structure by a method in which a thin PCa-type form unit and a reinforcing bar unit are penetrated into a pit while being connected with each other on the ground, and in-situ concrete is placed to the surrounding of the PCa-type form unit so connected. CONSTITUTION:A pit A is excavated by excavation work, and the pit A is filled up with mud water B. Cage-like reinforcing bar units 2 are each attached a plurality of PCa-type form units 1. The bottomed first stage unit 1 is penetrated into the pit A from a working base C and then connected with the unit 2 while being supported by the buoyancy of the mud water B. Water is injected into the unit 1 to set it on a given position. A tremie tube D is inserted into the pit A from the outside of the formwork 10 and concrete 3 is placed to integrally connect them. The accuracy of the construction work can thus be raised, and the cost can be reduced.
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