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Cable Exchange with wash-over-technology The energy suppliers are increasingly being ordered to replace unused or damaged ground cables against new ones. It is normal that ground cables get older and wear, as is the necessity to exchange them. To make sure that the exchange of old cables is pro- ductive, a simple and economical method is required. The TT HDD-bore technology offers with the so-called wash-over-heads the possibility of a trenchless removal or exchange of cables. Method process: The wash-over-head is guided over the old cable, which is separated inside the starting pit. Through permanent swinging movements from left to right, the drill rod is driven over the old cable at a speed of 1-2 meters per minute. The TT-wash-over-head is constructed, so that it follows the path of the old cable. The old cable acts as a compelled guidance for the wash-over-head, which cuts free the soil/ sand bedding and possible roots in a narrow ring without any contact, at an equal distance around the old cable. The old cable, which has been cut free can be easily drawn out of the ground with a cable winch or excavator subsequently. In an intermediate pit the wash-over- head threads out, but immediately connects with the next cable. In the path made free the new cable fitted with a cable protection sleeve or cable shoe can be drawn-in with the drill rod and parallel to the pipe, which is already situated inside the borehole. Out with the old cables - in with the new - trenchless Cable Exchange with wash-over-technology Starting phase: The cable is now laying inside the wash-over-head the wash-over-process can start. The free cut of encapsulated sandy ground is carried out with drilling fluid. The wash-over-head is con- structed, so that it does not make contact with the cable. old cable wash-over-head After separating the ground cable the wash-over-head is screwed to the drill rod of the Grundodrill bore rig in the starting pit. The patented wash-over-head from TRACTO-TECHNIK Info-Nr.: 362900U02/07.2006 E
