TUNNEL INVERT CONSTRUCTION METHOD AND SCAFFOLD BOARD DEVICE FOR TUNNEL INVERT CONSTRUCTION

摘要

PURPOSE: To meet a demand for early closing an invert and increase work efficiency. ;CONSTITUTION: A scaffold board device 20 is prepared. This device 20 has a platform 22, a front landing seat 24 of breadth equal to the lateral breadth of the platform 22, laid at the front end of the platform 22 in such a state as capable of lateral motion, and a rear landing seat 26 laid at the rear end of the platform 22. The device 20 is laid at the prescribed position, and the side section 29 of the first side 28 and the side section 31 of the second side 30 corresponding to the center section of an invert are excavated. Then, concrete is placed in two side sections 29 and 31 excavated to form a side invert. The front landing seat 24 is moved to the first side 28, and an area ranging from the center section to the side invert of the second side 30 is excavated. Then, the front landing seat 24 is moved to the second side 30 for excavating an area ranging from the center position to the side invert of the first side 28. Thereafter, concrete is placed in the center section.;COPYRIGHT: (C)1996,JPO