Trenchless pipe renewal in the narrow alleys of the historic centre of Rabat
In the historic Takadoum district in the centre of the Moroccan capital Rabat, a heavily damaged old water pipeline was renewed without trenches under difficult conditions using the static pipe bursting method.
The construction site was located in a pedestrian path only 1.20 m wide, which can only be accessed via stairs. All equipment and material had to be brought up the slope to the construction site by hand. However, this was not the only challenge for the contractor SADE. Massive earth movements had to be avoided as otherwise the slope with partially dilapidated houses threatened to collapse. The open design was therefore out of the question. The optimal solution was offered by the GRUNDOBURST400S
pulling rig, only 60 cm long, which makes it possible to replace pipes from out of manholes and small pits.
In Takadoum, GRUNDOBURST400S
replaced an old concrete pipe ND 300 over a total length of 80 m with new 50 cm long PE short pipes ND 315 mm. The renewal extended to a total of four sections with mains lengths of 25 m, 15 m, 10 m and 20 m. With a width of only 1.10 m each, the start and target pits as well as the necessary intermediate pits were a perfect match for the narrow footpath.
Once the site had been set up, the actual pipe renewal went off without a hitch. Although it took relatively long to link the only 50 cm long short pipe sections together and establish the friction-locked connection with the BURSTFIX, the actual bursting operation made progress rapidly at 5 - 6 m per hour. The entire measure was completed within four days.