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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<strong>Trenchless</strong> replacement <strong>of</strong> gas and water pipelines<br />
The hydraulic tracti<strong>on</strong> cylinders <strong>of</strong> the press-pull unit allow the old pipes to be pressed<br />
out without percussi<strong>on</strong> or jerks. In the intermediate pits (Figs. 3.7 and 3.8), the old pipe<br />
is slid over a breaker c<strong>on</strong>e or is smashed into pieces by an automatic pipe smasher (Fig.<br />
3.9). The fragments are c<strong>on</strong>veyed to the surface in bins. In the final pull-in step, the old<br />
pipe, as it is pulled into the arrival pit, is generally broken as the tracti<strong>on</strong> cylinders made<br />
their backward stroke (Fig. 3.10).<br />
Fig. 3.8 Next step <strong>of</strong> the operati<strong>on</strong>:<br />
Changing over the breaker c<strong>on</strong>e in the intermediate pits<br />
Fig. 3.10 Final step: Changing the breaker c<strong>on</strong>e over to the destinati<strong>on</strong> pit<br />
38<br />
2 nd pull-in step<br />
New pipeline Tracti<strong>on</strong> head Breaker<br />
c<strong>on</strong>e<br />
New pipeline Tracti<strong>on</strong> head<br />
Old<br />
pipeline<br />
Tracti<strong>on</strong><br />
linkage<br />
3 rd pull-in step<br />
Old pipeline<br />
Abutment<br />
plate<br />
Fig. 3.9<br />
The hydraulic pipe smasher<br />
Abutment<br />
plate<br />
Breaker<br />
c<strong>on</strong>e<br />
Tracti<strong>on</strong><br />
linkage