Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus
Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus
Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus
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Fig. 5.3 Assembly <strong>of</strong> the string <strong>of</strong> DN 900 pipes in a floodable trench<br />
Fig. 5.4 The string <strong>of</strong> DN 900 pipes floating in<br />
the trench when flooded<br />
General<br />
After this satisfactory experience, development went ahead at a very rapid pace: In 199<br />
the pipes were <strong>of</strong> DN 00 size [ .2] (Figs. .1 and .2), in 2000 the bar was raised<br />
to DN 00 [ .3] and in 2003 DN 700 pipes were pulled in by the horiz<strong>on</strong>tal directi<strong>on</strong>al<br />
drilling technique in the Netherlands [ . ]. The current record – held by <str<strong>on</strong>g>Buderus</str<strong>on</strong>g><br />
Giesserei Wetzlar GmbH pipes with BLS ® joints and ZMU – is approximately 00 metres<br />
<strong>of</strong> DN 900 pipes in Valencia in Spain (Figs. .3 to . ).<br />
In parallel with this the DVGW was developing technical rules for the technique, and<br />
these took the form <strong>of</strong> Arbeitsblatt GW 321 Steuerbare horiz<strong>on</strong>tale Spülbohrverfahren<br />
für Gas- und Wasserrohrleitungen – Anforderungen, Gütesicherung und Prüfung [Steerable<br />
horiz<strong>on</strong>tal directi<strong>on</strong>al drilling methods for gas and water pipelines – Requirements,<br />
quality assurance and testing], which was published in October 2003 [ . ].<br />
Fig. 5.5 Beginning <strong>of</strong> the pulling-in with a barrel<br />
reamer ahead <strong>of</strong> the string <strong>of</strong> pipes