A ground boring equipment has a vertical lance (12) pushed into the ground and rotated while an erosion fluid is pumped through the lance and out of radial jets (14). Hollow pipes (18,20) are inserted into the ground at a set spacing from the lance to monitor the reaction force from the jets ie. to determine when the jets have eroded the required diameter. The pipes are slit, or have inlet apertures to monitor the height of the fluid in the pipes and/or the reaction force.
申请公布号
DE19731223(A1)
申请公布日期
1999.02.18
申请号
DE1997131223
申请日期
1997.07.21
申请人
KELLER GRUNDBAU GMBH, 63067 OFFENBACH, DE
发明人
BERG, JOACHIM, DIPL.-ING., 63150 HEUSENSTAMM, DE;TOTH, PAUL-STEFAN, DIPL.-ING., 61118 BAD VILBEL, DE;TRUNK, ULRICH, DR.-ING., 86919 UTTING, DE