CONSTRUCTION OF UNDERGROUND SPACE

PURPOSE:To prevent the expansion of working area by making side walls of an underground space with two or more rows of opposite continuous walls and bridging upper slabs between the upper portions of the underground continuous walls, and excavating the inner ground divided by them to construct a space. CONSTITUTION:Both side walls of an underground space 5 are constructed with underground continuous walls 1, and the upper face and the bottom face of the space 5 are constructed with upper slabs 2 and bottom slabs 3 respectively, and the continuous walls 1 and the upper slabs 2 are joined to each other through pedestals 4. After constructing the underground continuous walls 1 and the upper slabs 2, the inner ground divided by them is excavated to install bottom slabs 3. Thereby even when the ground is soft, the construction of the underground space can be carried out inducing no disturbance around the peripheral ground.