THE MAGAZINE FOR THE DRAINAGE, WATER & WASTEWATER INDUSTRIES
NEWSDESK
Arrival of the new PE pipe length inside the construction pit
Connecting the bursting head to the rod string
200 mm, wall thickness 11,9, 12msingle sections (Manufacturer: SIMONA AG, Kirn) via a bursting head to an expander OD 240mm with 3 blade strips. It then only needed connection to the Quicklock rods.
displaced into the surrounding soil, while in the same working step, the new pipe is pulled into the ground, for two reasons. “First of all”, Alfes explains, “because we are talking about an old asbestos-cement pressure pipe ND 150, where it would make great sense to leave this in the ground. Secondly, a larger diameter was required in the course of the renewal for hydraulic purposes, which is part of the technology and easy to realise with pipe bursting.”
Pushing in – Bursting – Pulling in
Ready to go. The GRUNDOBURST 800G was placed in the approximately 4,5m long and 2 mwide starting pit and ready for action, together with the magazine containing the Quicklock-bursting rods. Almost with the rhythm of a synchronised 8-man rowing team, the rig pushed the rods smoothly and quickly through the old pipeline, mainly due to the Quicklock link coupling, but also the positive force transmission preventing the rods from slipping back. After just under an hour, it arrived in the target pit after a good 150 m. Two crew members had already attached the new pipe, PE 100 SPC-RC, nominal width of
FOLLOW US
Then they received the command by walkie- talkie: Time to pullback! In the process, the old asbestos-cement pipes were broken apart and displaced into the surrounding soil. The existing bore path was expanded to 240mm and the new PE-pipe installed at the same time. The bursting process and simultaneous pulling-in process was just as smooth as the rod insertion process and to the beat of steady rowing strokes. The loose sandy soil was well able to absorb the old pipeline, which was already very old and therefore relatively easy to burst, offering no resistance to the new PE pipe during the pulling in process.
Homeand dry
After a total of four and a half hours the second, 150mlength section of the 840m total length pressure pipe was renewed and “underground” and already history to the local residents. The application of the pipe bursting method and the GRUNDOBURST 800G proved to be spot-on for this pipe renewal task, as the advantages are unbeatable compared to the open-trenching method:
■ Compact design of bursting rig for small starting pits
■ Quick set-up
■ Fast work cycles with high performance
■ Fast thrusting of bursting rods into the old pipe and during installation of new pipe
■ Time saving with Quicklock-Bursting rods, thanks to their quick-link
coupling
■ Short construction and set-up times ■ Renewal takes place in the existing
Provisionally connecting the newly installed PE pipe to the old asbestos-cement pipe so that the pipeline can start operating again
March 2021 | 21
Pulling in the new PE pipe bore path
■ Method is applicable for almost all types of damage and old pipe materials
(here: asbestos-cement!)
■ Environment, traffic and local residents are only minimally influenced
■ Considerably lower costs opposed to the open trenching method
■ Result is comparable to a complete new installation (long service life)
The extremely well organised team worked hand in hand and without the need for many words, had renewed the first 450m length construction section in the outer location with the static pipe bursting method. A strong team with a strong method.
TRACTO develops, builds and distributes machines and accessories for the underground installation and trenchless renewal of pipelines. These trenchless technology solutions are applied for the construction of pipeline networks for water, gas, electricity, telecommunications, district heating, fibre optic networking, pipeline construction and sewage disposal. Customers for these NODIG systems come from the fields of civil engineering and special civil engineering, but also include utilities and network operators. TRACTO is based in Lennestadt-Saalhausen (Germany) and has around 600 staff members worldwide.
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