This prior information notice contains several sub-contract that will be announced separately on DOFFIN.
The works with establishing of a new sewage pump station PA6 and associated sewage pump pipeline to Nedre Romerike Avløpsselskap IKS‘s side tunnel, can be divided into to sub-projects:
Worked connected with the new sewage pump station PA6:
Establishment of new pump station for sewage with a pumping capacity of 600 L/s and establishment of an equalisation volume of approx. 900 m3. The equalisation volume will be approx. 40 meters long and connected to the flushing and ventilating pipe.
Concrete cast on site pump station, approx. 9 m deep, 12 m x 12 m with superstructure.
Contains i.a. pumps, fans, diesel aggregate, frequency converters and controls, odour reduction (deoderising), ventilation system, blower machines, gantry crane, toilet, flow metering etc.
Outside works comprise i.a. establishment of building pits, sheet-piling, filling and excavation of matter, establishing roads, parking area and preparation of terrain, construction of a small concrete bridge, erosion protection, opening of channelling of streams in culvert, etc.
In addition, deep trenches must be dug for both pump and gravity lines on land.
Works with demolition of the existing pump station.
Trenches for electrical cables.
Please note that the list is not comprehensive.
Works in connection with pipeline works with new pump sewage pipeline from new PA6 to NRA’s side tunnel A:
Laying of sewage pipeline with a dimension of Ø710 mm SDR13.6 such as offshore pipelines in Nitelva. Excavation over neck of land with establishment of air shafts. Establishment of trenches on land. Rock boring ((hammer type boring) in rock, approx. 200 m. Boring or trench up to the sewage tunnel.
Please note that the list is not comprehensive.