Gotthard basetunnel, Sedrun
		The project: Railway tunnel Alptransit Gotthard, building lot 360 Executing companies: Consortium Transco-Sedrun Batigroup AG Tunnelbau Frutiger AG Bilfinger Berger AG NL Tunnelbau Impresa Pizzarotti & C.S.p.A.
The problem: Pumping off the water arising during mined tunnel heading. The extraordinary challenge of the 'Sedrun section' with two parallel tunnels each 6.2km long is the penetration of zones of extreme geological difficulties and the supply to the building site through a mine shaft 800m deep.		sludge to be pumped
		At the foot of these shafts two parallel tunnels are driven using conventional methods to the north and to the south. The tunnels are driven through rock of the Tavetscher Massif having little stability with 2000m capping, making the work extremely difficult. In addition, one of the two multi-function stations of the 57km long Gotthatd basetunnel will be constructed within the Sedrun section.
Our solution: Application of so far 15 Tsurumi submersible waste water pumps for draining. Pump series used: KTZ, KRS, KTV, LH From top: Fig. 1: View into the shaft Fig. 2: KRS2-100 for sludge pumping Fig. 3: KTV2-37 flying pump in the area of the tunnel front Fig. 4: KTZ47.5 in collecting basin
In the event of abrasive and corrosive utilization, stronger wear and tear will take place naturally in certain components. With regards to the above application wear and tear can take place mainly in impeller, agitator, suction plate, shaft sleeve, oil ring, mechanical seal, pump casing, strainer, motor casing and discharge coupling. Depending on the working conditions the lifetime of those parts might vary significantly and can be shorter than the legal warranty period. In this regard, please pay attention to our general conditions of sales (www.tsurumi-europe.com/english/GCS.htm) that we also send to you by mail on request.