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Formwork

CBE Group

  • Tunnel formwork / metal / concrete
  • Tunnel formwork / metal / concrete
  • Tunnel formwork / metal / concrete
  • Tunnel formwork / metal / concrete

Article: 00054580

Tunnel formwork / metal / concrete

The segment geometry and materials are defined according to the tunnel geometry layout. As each tunnel is unique, so are its segment and mould. The mould being entirely dependent on the segment geometry, its engineering can only be made according to the segment concrete design. Therefore, the concrete design supplied by the engineering department is a crucial step within the mould developement process.
Mould engineering

A segment mould is composed of a bottom part, four side walls and two covers. The mould length can be several meters long depending on the ring size, which requires a tenth-millimetre scale adjusting accuracy. This high precision, seldom seen in boilerworks engineering, is the main asset of CBE's know-how.

The required accuracy is especially difficult to achieve, as the side walls are made mobile to ensure the segment demoulding. In order to perform thousands of operations, the mould should be able to sustain high levels of stress and keep its precise physical integrity during its whole life-cycle.

The mould vibration system, which is often in-built, mechanically stresses each mould component. This stress requires systematic material strength-calculations to track down possible weak spots in the mould design.

Specifications

  • Type: tunnel
  • Material: metal
  • Other characteristics: concrete

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