Distinction manner null of the geological features in

摘要

PURPOSE:To construct a foundation pit and permit the management with high precision in consideration of the state of each geological feature by judging the geological feature of the pile hole in excavation from the electric current value or torque value which is generated in pile hole excavation by utilizing the corresponding well-known geological feature. CONSTITUTION:An auger machine 5 is lowered, revolving the rotary rod 8 of a pile driver 1, and the descent quantity is detected by a depth meter 13, and the load electric current of a driving motor 6 is detected by a load electric current meter 12. Then, water is jetted from the top edge of the rotary rod 8, and a pile hole is successively excavated by an excavating cutter 9, and the excavation soil is made muddy by the agitation of the agitation rods 10, and the muddy soil is attached on the inner wall surface of the pile pit 14 by an attaching drum 11. Then, the load electric current and the output value of the depth are inputted into a CPU 14, and recorded and stored by a recording device 16, and displyed on a graph by a CRT 15. The geological feature representation is superposed on an electric current graph and displayed on a display device 15, and stored in a floppy disc, and the geological feature of the pile hole is judged.