| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily remove a floor according to a change in a production line, for instance, to change the direction of a structure beam for supporting the floor in an underground pit, and to easily change layout in the underground pit at a low cost.SOLUTION: An underground pit structure 1 includes: PC columns 2 which are erected on a pit batholith 12a and arrayed at fixed intervals for each direction of a lateral direction X and a longitudinal direction Y within a horizontal plane; steel beams 3 which are installed by being joined to upper end faces of the PC columns 2 and arrayed along the lateral direction X or the longitudinal direction Y; and a PC floor slab 4 mounted between the steel beams 3 adjacent to each other. The PC floor slab 4 is connected to the RC columns 2 and the steel beams 3 with detachable bolts. The steel beams 3 are configured so that the directions can be changed in the lateral direction X or the longitudinal direction Y by being removed from the RC columns 2.</p> |
