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Toulon Tunnel, France

The Project:


Tunnelling beneath the city centre of Toulon. The tunnel runs parallel to the north bore, in the direction of Nice/Marseille, which was already completed in 2002.

The tunnel is at the present time the most important tunnel construction project in France, and the technical challenges are enormous. Length: 3310 m, diameter: 8.25 m, depth: 35 m. The tunnel was driven from two faces, with breakthrough taking place in March 2011.


Companies involved:

Bouygues Travaux Public Group

Soletanche-Bachy

Colas Méditerranée

Screg South-East


The Problem:


The site is located at a depth of 35 m, in the ground water, and has the effect of a huge drain pipe. All the construction sections must be kept dry, and the water also has to be pumped out which enters in fluctuating quantities as the tunnel is driven forwards.


The Solution:


Use of pumps of the KTZ Series, with components made of cast chrome iron, in order to pump the water out of the filters into the settling basins. In the settling basins there are agitator pumps of the KRS-series equippied with slow running 4-pole motors (1500 r.p.m.). Control is provided via switchboxes. High-pressure pumps of the LH Series are used to pump the water out of the settling basins. The high pressure of these pumps prevents the pipes from clogging.


karte

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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 terms and conditions that we also send to you by mail on request.