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Tunnels and underground structures

In tunnels and underground structures, MagnaDense can be used for controlling buoyancy and overcoming issues with sound and vibration.

Your contact for 
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Mark McKenna

Business Development Manager Magnetite

Worldwide, engineers are seeking new and sophisticated tunnelling solutions to limit ground bourne noise and vibration and overcome hydrostatic pressure, in an environment where space is often restricted. Similarly, sub-level structures are looking for solutions to withstand natural ground water pressure. The solution for many projects has included the use of our high density aggregate MagnaDense.

Preventing vibration and noise from tunnels to surface

Crossrail, currently the largest European infrastructure project, is a perfect example of where MagnaDense is the best fit in an area bound by many limitations. Running beneath central London, the project encountered many constraints including the restricted volume of the tunnel and the proximity of surrounding infrastructure, meaning space was limited.

The solution was the construction of a High Density Floating Track Slab (FTS), utilising MagnaDense concrete. Due to the limited available construction space the concrete, developed to include the heavy aggregate MagnaDense, was the most suitable option to prevent noise and vibration caused by the passing trains. The project also had to overcome many logistical challenges, especially with the pumping site being situated within the city centre.

The Crossrail project saw the world’s first installation of a High Density Floating Track Slab and set a world record for pumping high density concrete. As a result, LKAB Minerals and partners were nominated for four awards at the NCE Tunnelling Awards in 2017.

For more information about the project, or to hear about the technical details of this construction, you can listen to the Crossrail webinar recorded together with our partners.

Overcoming hydraulic pressure with heavy aggregate

In a second section of the Crossrail project, dense concrete was required for the first stage concrete works due to the location’s proximity to the River Thames. Again, due to tunnel bore restrictions, additional weight was required in the concrete to overcome hydrostatic pressure.

The use of high density concrete in situations where there is a need to overcome hydrostatic pressure is not only limited to tunnelling projects but is also in more common constructions such as sites with existing sewer networks, buildings with sub-level floors and underground parking garages.

Efficiency benefits with MagnaDense in tunnels

Depending on the complexity of the infrastructure project, high density MagnaDense brings engineering solutions when bound by:

  • Space
  • Time
  • Budget
  • Environmental aspects

Our international team of highly skilled business development managers helps you to select the right mixture of MagnaDense for your next engineering project. Samples, a quotation, specification or more information is received fastest by contacting the responsible regional contact person, found in the expert box on the right top of this page.

Logistics and availability of MagnaDense

Mined from our group owned resources in Northern Sweden, MagnaDense, manufactured from the natural iron oxide Magnetite, will always be of constant quality. Via the large harbours of Narvik (Norway) or Lulea (Sweden), ships take the heavy aggregate to our different stock locations around the world, or directly to your project.

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High density concrete

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My name is Mark McKenna and I am located in United States.

Please give me a call or send me a message if you are interested in our mineral solutions for Tunnels and underground structures

Office 001(312) 513-5741
Mobile 001(312) 513-5741

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08:00 AM - 17:00 PM

Local time in United States is 05:36 AM (UTC -5)

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