Safe and efficient tunnel form construction solutions

From cut-and-cover tunnelling to tunnel linings, Altrad RMD Kwikform has a strong reputation for tunnel form construction. Key considerations include the shape of the tunnel - some might have a curved, circular crown, whereas others could have a flat soffit or haunches between the walls and the soffit. The length of the tunnel will also play a role in the type of equipment used, as a tunnel passing under a rail embankment will generally not need a specialist system, unlike a tunnel extending some miles, which will be better suited to take advantage of features such as structural steel and hydraulic equipment.

The duration of the project and turnaround deadlines will also impact on the best tunnel formwork system for the job.

RMD Kwikform's tunnel form system on the Tyne Tunnel

Tunnel formwork on the Tyne Tunnel in the UK

RMD Kwikform tunnel form construction

Key considerations

  • The construction sequence
    The construction sequence is an important consideration. Will the entire tunnel be cast as one section, or will the slab, walls and roof be cast separately? You may decide to cast the roof and side walls of a tunnel together, as this helps with the waterproof integrity of the tunnel because there are no joints on the outside, other than the kicker and its base.
  • The casting sequence
    If you plan to cast a tunnel’s slab first, then the walls and then its roof, this could all be done using standard formwork equipment. However, specialist equipment will be required if you decide to cast the whole tunnel section together. There are lots of consideration to bear in mind, depending on where the construction joints are, our engineers can help specify the right system for your tunnel project.

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