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Contractors World 2012 Volume 3 Issue 2
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Cost-effective realisation of arched tunnel for safe animal crossing - page 2 of 2

Mechanical solution – easy handling

Due to the low number of uses of the formwork carriage, it was decided not to use hydraulic components for shuttering and striking or moving procedures. The main focus during the planning of the mechanical solution was on the ease of use.

Shuttering and striking of the internal formwork is carried out easily and problem-free by means of spindles; subsequently, the formwork carriage is moved to the next casting segment using two winches. The external formwork is moved by crane.

For shuttering and striking, the construction team utilises simple spindles. In order to pivot the side elements inwards, only the lowest spindle has to be used.

By releasing the heavy-duty wedges under the HDT girders, the entire formwork unit is lowered by around 8 cm. In the subsequent casting segments, the formwork carriage is pulled by means of two winches with the flat and straight course of the tunnel simplifying this process.

Hydraulic jacks bring the formwork carriage into concreting position after moving, the side elements are then spindled upwards. Extensive prefabrication of the reinforcement sections directly next to the tube accelerates their installation. Finally, a mobile crane moves the external formwork into position which consists of only two elements per side. For placing the concrete, 12 concreting windows are used whilst compaction is carried out through internal vibrators.

Through the simple mechanical operations of the formwork carriage, the construction team was able to achieve a four-day cycle per concreting section after a very short familiarization Period.

A completely safe solution

Apart from the easy usability of the formwork carriage, the safety of site personnel has the highest priority. Among other things, the carriage has generously-sized working levels that are pre-assembled on the external formwork. SRU steel walers and GT 24 lattice girders form the sub-structure of the platforms.

The mechanically operated formwork carriage is 10 m long; the construction team requires four days for each concreting section.

The construction site team is guaranteed secure working conditions through the 1.10 m high PROKIT side mesh barrier which is fitted to all open edges.

Click here for more information >>> Peri Variokit

 

 

 

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Publisher: Roger Lindley
Content compiled and edited by:
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Page updated: February 2012

 

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