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An innovative method of casting tunnel segmentsincluding an adapted mould

Tunnel segment lining with self compacting concrete (SCC)


Nowadays, tunnels are often excavated using tunnel boring machine (TBM). The lining of such tunnels is a succession of rings generally made of precast concrete segments. The concrete segment industry needs very stiff moulds with very accurate geometry to support high vibration energy applied on the mould a thousand times during its lifetime and to achieve segments perfect enough to provide water tightness, to support ground loads and to withstand the huge TBM thrust jacks once assembled. Moreover, segments production is a tough task for operators especially due to the noise pollution of the external vibrators and the finishing of the extrados. A new and innovative method was developed to reduce the premature ageing of the moulds, to minimize as far as possible operators tough tasks and to produce easily top quality segment with an extrados side achieving and even exceeding geometrical tolerance and smoothness requirements. This paper explains the interest in the proposed method which combines the use of Self Compacting Concrete (SCC) with an inventive segment mould and then describes the real scale test results.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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