speed•pipe® bundle ground gabo Systemtechnik SRV-G und SRV-G tc Laying instructions 45 Trench bottom and duct bedding. For the trench bottom and the duct bedding only compactable and stonefree material (grainsize < 63 mm) may be used. Before the laying process the trench bottom must be gently vibrated with a compactor. Pay attention to an even compacting. Mechanical compacting equipment is not allowed under 30 cm depth of coverage. In case of rocky or stony subsoil (grain-size > 63 mm) the trench bottom must be excavated at least 0.15 m deeper and the excavation must be replaced by a stone-free layer (sand 0 – 2, with maximum grain size Ø 2 mm). After laying, the duct zone must be backfilled with sand up to 10 cm above the top of the duct bundle apex in the tensioned state. (See ZTV-TKNetz 10 / 11). Example for an optimal duct bedding. surface compacted ground, free of stones covering with sand untreated trench bottom after excavation trench bottom levelled with sand bed and compacted ≥ 30 cm approx. 10 cm approx. 10 – 15 cm SRV-G tc ≥ 50 cm covering The unpredictability recurring in practice is well known to all and cannot be assumed by the manufacturer. Therefore, we generally recommend laying in a sand bed for optimal pipe bedding. Recommendation
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