Contractors World UK & Ireland
|2011 Volume 1 Issue 8|
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• Snorkel UK Appoints PLP Lift Trucks As Regional Dealer
• A-Plant to Merge Lion Trackhire and Eve under New Name
• Lendlease have renewed their framework agreement with Human Recognition Systems.
• RPS Appointed for GWR Exeter Depot Expansion
• CASE appoints new heavy-line specialist
Major Thames Water Tunnel works begin - page 2 of 2
Providing crane handling over the site for duties such as lifting up excavated material and in concreting is a Potain MD 560 B. The crane is removing excavated soil from tunnel shafts and is scheduled to help with concreting later in the project.
The excavation works at the bottom of the caissons are being done with two zero-tail swing Lieberr R924 excavators as the dig down to depth.
Potain crane has got it covered
The Potain MD 560 B on site is Manitowoc’s largest top-slewing crane in the standard MD line and the first in the country.
Work on the project is demanding and continues around-the-clock to ensure the project stays on schedule.
Bernard Chatelet, plant manager for MVB, the joint venture contractor on the tunnelling job, said there were two reasons for choosing the MD 560 B.
“First, it has great lifting capability, so we knew the MD560 B would be able to handle the loads we need to excavate,” he said. “Second, it has a powerful and fast winch. We need to complete the shafts before we can begin work on the tunnel itself, so it’s important to have a productive winch that will help us complete this part of the work on schedule.”
The crane is working on the first stage of the tunnel, excavating material to create four 80 m deep shafts. To remove material for the shaft, which is mostly chalk and highly-abrasive flint, the two compact Liebherr excavators sit inside the shaft and fill a skip with 20 t of soil which, combined with the skip weight, makes for a total load of 26 t. The MD 560 B removes and empties the skip, before returning it to the shaft for refilling.
Two Liebherr R924 compact zero-tai lswing excavators are removing material from the bottom of the ciasson which is loaded on to a skip for removal by crane.
The crane is working with four falls of wire rope giving it a maximum capacity of 40 t. The crane features a 250 LCC 100 hoist, which can reach speeds of up to 33 m per minute and is fitted with more than 500 m of cable.
In its current role, working on the overflow shaft, the crane has a height of 32 m, although lifting heights will be over 100 m, as the shaft depth will eventually reach 80 m. For this work it has 50 m of jib. The crane will also work on the pumping shaft and its height will be increased to 46 m, while the jib will extend to 70 m.
Once the six-month excavation phase is complete, the MD 560 B will be used for concreting and other duties. There are two operators assigned permanently to the crane, each working a 12-hour shift five days a week. A third operator is on standby to cover in the event of an absence.
One of Europe’s largest projects
The 6.4 km Lee Tunnel will help capture 16 million tonnes of sewage forced into the River Lee during heavy rainfalls - 40% of the total effluent overflowwith which Thames Water has to deal.
The large Herrenknecht tunnel boring machine has recently been delivered and will begin tunnelling in the new year.
London’s sewers date from the 1800s and are simply not big enough to handle a city that continues to grow and also has covered areas of natural drainage in concrete. At 7 m, the tunnel’s diameter is wider than three of the capital city’s trademark double-decker buses.
The Lee Tunnel is one of three projects in Thames Water’s London Tideway Improvements program, designed to create a cleaner and healthier River Thames. The program also includes expanding Beckton Sewage Treatment Works by 60 percent to accommodate the increased volumes.
Construction began in September 2010, and tunnelling work is expected to finish by the end of 2013. The whole project should be complete by 2015. The joint venture contractor, MVB, brings together construction companies Morgan Sindall, VINCI Construction Grands Projects and Bachy Soletanche.
Contractors World Magazines are published by VVV Limited
Publisher: Roger Lindley
Page updated: December 2011
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