21 8 2014 FLEXWELL district heating cable FHK Subject to technical changes 5 535 Horizontal directional drilling HDD method Because of its flexibility and its corrosion proof outer casing FLEXWELL district heating cable is particularly suitable for the horizontal directional drilling HDD method described below This application is possible for the entire series of dimensions from FHK 30 91 to FHK 200 310 The horizontal directional drilling HDD method was developed to install supply pipes and lines without trenches The horizontal directional drilling method is used wherever protection is required for valuable surface areas such as parks protected countryside zones pedestrian zones pavements and cobbled paths gardens in front of buildings etc or where difficult crossings have to be constructed waterways canals roads with heavy traffic rail lines embankments or built structures etc Brief technical process description The boring tool consists of individual hollow drill assemblies which are screwed together and a drill head equipped with jets A water bentonite mixture atomized under high pressure in small quantities cuts and loosens the adjacent ground whilst stabilizing and lubricating the bore hole The special shape of the drill head allows targeted changes of direction and precise control of the bore At the end of the pilot bore the drill head is exchanged for a widening head fitted with jets and the FLEXWELL district heating cable that is to be drawn in is connected At the same time as the drilling assembly is withdrawn the FLEX W E L L district heating cable is drawn into the bore hole which has been widened and supported by the water bentonite suspension Benefits of the system No pipe trenches earthworks only required for installation pits Minimal damage to surfaces No consequential damage e g due to subsidence of the ground or road surface Disruptions and hazards to stationary and moving traffic are minimal Consideration is given to protecting trees and plants Process is largely independent of weather conditions High speed working

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