0 1 0 1 d min 0 60 3 x x B x T min 1 5 6 7 x min 0 1 2B L K A R min A 2 3 1 4 B 21 8 2014 FLEXWELL district heating cable FHK Subject to technical changes Information for underground construction Trench dimensions 5 550 FLEXWELL district heating cable type 30 91 39 116 60 148 75 171 98 220 200 310 98 171 127 220 147 220 Outer diameter of FHK d mm 94 121 156 178 233 313 Trench depth T min for SLW 60 1 m 0 80 0 85 0 85 0 90 0 95 1 05 Minimum coverage height t for SLW 60 m 0 60 0 60 0 60 0 60 0 60 0 60 Trench width B m 0 50 0 55 0 60 0 65 0 75 0 95 Working space width 2B m 1 00 1 10 1 20 1 30 1 50 2 00 Working space length Lk m 0 50 0 50 1 00 1 00 1 50 2 50 Minimum trench radius 2 R min m 1 00 1 20 1 50 2 00 4 00 5 00 Material excavated from trench 3 for SLW 60 m 3 m 0 40 0 47 0 51 0 59 0 72 1 00 Sand filling m 3 m 0 14 0 16 0 18 0 20 0 24 0 39 Figure 1 Layout plan of trench Figure 2 Cross section of trench Section A A Structure 1 FLEXWELL district heating cable FHK 2 Connector 3 Sealing bushing wall leadthrough 4 Working space in front of buildings and shafts 5 Pipe warning tape supplied by BRUGG Pipe Systems installed by customer or others 6 Sand filling 0 4 mm round particles 7 Filling material reusable excavated material Trench and working space dimensions quantities of excavated material and sand filling 1 SLW 60 100 kN wheel load to DIN 1072 2 Smaller radii only after consulting BRUGG Pipe Systems 3 Excavation quantities ignoring gradient of embankment Figures in m Trench widths B are recommended values Please follow generally valid technical rules guidelines and accident prevention regulations

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