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 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 2011-03 Herrenknecht Formwork Days 2011

All around Concrete Segments

New trends in the field of tunnel lining were discussed on the 3rd and 4th of March, 2011 in the Europa Park in Rust. Designers, representatives of construction companies and precast concrete segments...

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Issue 2017-06 Hahn Kunststoffe

Segment Storage

The same applies for every tunnel project: segments must be at the right place at the right time. Towards this end, special demands are posed on the transport and storage of these weighty concrete...

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Issue 2012-08

High-Precision Segments: Prerequisite for a high-quality monocoque Tunnel

1 Starting Situation When producing single-shell tunnels excavated by shield, the dimensions of the segments – defined by the segment tolerances, are of enormous significance regarding the...

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Issue 2010-07

Adjustable flexible segment lining

Mechanical tunnelling has gained increasing importance over the past years. This tunnelling method, e.g. with a shield machine, provides a high degree of security for the tunnelling team. With...

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