JP2946275B

PURPOSE:To easily robotize construction by installing a plate body on the unexcavated ground, and providing an excavator excavating and moving the ground with high pressure fluid to the plate body. CONSTITUTION:A plate body 1 used for a roof and a bearing foundation of a structure planned to construct is laid on the unexcavated ground. A passage 2 is provided on the plate body 1, the ground is excavated with high pressure gas, powder and grains through the passage, and an excavation equipment 3 capable of making blowoff is installed. A compressor 31 is provided to the excavation equipment, the compressor is pressurized to manufacture compressible fluid, it is injected from an internal pipe of a double pipe 4a and, at the same time, negative pressure is applied to an external pipe of the circumference of the internal pipe to make it possible to absorb broken pieces. In addition, in the double pipe 4, rotation and extension can be freely made with a position of the passage 2 as the center, and the double pipe 4 is slowly revolved to construct an underground space 5.