Segment Storage

New mago Load Distribution Board

Until now, normal untreated hardboard has been used as load distribution boards. For the purpose of rationalisation, these boards are mostly glued on immediately after segment production. Then the segments are often stored for a few weeks or months exposed to the weather. With this procedure, it can occur that the load distribution boards, which consist of 93 % wood, absorb damp, swell up and can sometimes exceed the specified thickness by 50–80 %. In such cases, the function of the sealing is no longer completely ensured and water can leak into the tunnel. The remediation of such defects is...

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Issue 2015-01 France/Saudi Arabia

Acimex supplies Vacuum Technology for Riyadh Metro

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Issue 2018-04 Heco

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With the Multi-Monti screw anchor, German fastening specialist Heco from Schramberg in the Black Forest supplies a product for fastenings in concrete which offers numerous benefits compared to drop-in...

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Screw Anchor for Fire Protection Boards in Tunnel Constructions

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Issue 2012-03

Influences on Segment Damage

1 Introduction Segments represent the bearing structure for the finished product in mechanised tunnelling. This fact results in high demands both on manufacturing as well as on transporting and...

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Issue 2021-03 Sealable Solutions

New Groove Geometry to Prevent Concrete Spalling on Segments

It is generally known that the design of segments tends to become thinner and thinner due to cost, handling and environmental aspects. Consequently, the contact area between the segment rings is also...

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