Page 59 - Trenchless Technology Piping Installation and Inspection
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Depth (ft) Accuracy Typical Application Pipe Material c ± 1 in. Pressure & gravity pipes RCP, GRP, steel ± 1% of the Road & railroad crossings Steel bore length ± 1 in. Pressure & gravity pipes Steel ± 12 in. Pressure & gravity pipes Steel Varies Pressure pipes/conduits/ HDPE, steel, PVC, cables ductil
Max N/A a N/A a N/A a N/A a 60 100 200 N/A b N/A b N/A b
Inst. Length (ft) 1600–3500 600 600 600 600 600–2000 2000–6000 1500 300 400 a Not all the contractors have the necessary equipment and required experience to use this method.
Diameter Range (in.) 42 & up (144 in.) 4–60 4–60 4–60 2–12 12–24 24–60 12–136 6–30 4–140 Main Characteristics of Trenchless Installation Methods
Trenchless Method Conventional pipe jacking & utility tunneling Auger boring (conventional) Auger boring steered on grade a Auger boring steered on + grade a Mini-HDD Midi-HDD Maxi-HDD Microtunneling Pilot tube microtunneling Pipe ramming TABLE 1.5
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