Moling system

Details Moling system Moling system

E - Fixed Constructions

21

B

325/44

E21B 47/09 (2006.01) E21B 7/06 (2006.01) E21B 47/024 (2006.01) E21B 47/12 (2006.01) H04B 7/24 (2006.01)

Patent

CA 2033062

2033062 9015221 PCTABS00002 A moling system comprises a mole (10) having a head (26) with a slant face at the leading end of a string of hollow rods (20). The rods are rotatable by a rig (12). The mole is an impact mole fed by air passed through the rods. While the mole rotates it travels approximately straight, but non-rotating it travels according to the direction of the slant face (28). The mole contains a radio sonde having one coil lying lengthwise and one transverse to the lengthwise direction of the mole. A receiver (22) is traversed across the ground to locate the radio sonde and display roll angle. The mole is stopped from rotating at the correct position when steering is required and powered without rotating to change course. An impact activated switch in the mole switches off the battery supply while the impact mechanism is activated.

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