DEEP FOUNDATION CONSTRUCTION METHOD USING BEDROCK EXCAVATOR

摘要

PROBLEM TO BE SOLVED: To provide a method for constructing a deep foundation pile by using a bedrock excavator operating by automatic control, when the deep foundation pile such as a shaft is constructed in a bed rock.;SOLUTION: In this method for constructing the deep foundation pile, a vertical advancing drift with a large diameter is pre-excavated by means of a down-the-hole hammer, so as to enhance the efficiency of the excavation of the bedrock; a central-axis shaft is erected in the vertical advancing drift; a bottom part is subjected to foot protection; and after that, the bedrock excavator, which is composed of a cone wherein many rotatable disc-shaped peeling and crushing blades are spirally arranged, is used. An end-surface excavating plate with many free surfaces is formed; a reaction bearing material for propelling and rotating a bedrock excavator body downward along the central-axis shaft of the pile is constructed; and efficient cutting and earth-removing work, using the bedrock excavator, is performed in an unmanned manner by using an integrated automatic control system which performs the control of the displacement and load of a piston cylinder, and the control of a rotational speed of a drive motor, on the basis of a reference soil concentration of slurry.;COPYRIGHT: (C)2005,JPO&NCIPI