| 摘要 |
PURPOSE:To raise the efficiency of the titled operation by widening an operating space for constructing an underground structure by a method in which a master pile and a cross sheet pile are set on a sheathing wall line, and the floor beam of the first floor is supported on the master pile prior to the construction of an underground structure. CONSTITUTION:A master pile 1 made up of H-shaped steels or rails is penetrated at each given interval along the sheathing wall line, and as the primary excavation 6 proceeds, cross sheet pile 2 is set between the master piles 1. The floor beam 3 of the first floor is set before the construction of the lower part of an underground structure and supported on the master pile 1 through a support metal 4. The secondary excavation 7 is made, an underground structure is constructed on the lower part of the beam 3, and the master piles 1 are removed out to eliminate the need for the setting period of temporary receiving columns. By directly supporting the beam 3 on the master piles 1, operating space can be widened, interference with the underground structure can be eliminated, and the efficiency of operations can be raised. |
