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Contractors World 2012 Volume 3 Issue 2
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Focus on the providing the highest level of safety: the open edges of all working platforms are equipped with PROKIT side mesh barriers. The simple and quickly mounted system provides the best protection against falling.

Focus on the providing the highest level of safety: the open edges of all working platforms are equipped with PROKIT side mesh barriers. The simple and quickly mounted system provides the best protection against falling.
(Photo: PERI GmbH)

 

France

Wild game underpass RN 88 near Albi-Rodez

Cost-effective realisation of arched tunnel for safe animal crossing

In the course of the expansion of Route Nationale 88 in France, an 80 m long wild game underpass is also being constructed. For construction of the arched tunnel, a Peri tunnel formwork carriage on the basis of the VARIOKIT engineering construction kit is being used. The easy handling of the equipment along with pre-assembling the formwork elements at the depot meant that the construction crew was able to quickly achieve the planned three-day cycle.

In order that the animals do not shy away from using the tunnel, a very generous cross-section was planned for the 80 m long structure. A small stream also runs along the complete length of the 15.00 m wide and 9.24 m high, semi-circular tube which is being constructed above the bottom plate as a single unit using a cut-and-cover method.

A generously-sized, semi-circular tunnel crosses under the RN 88 highway in southern France; it ensures the safe passage of wild animals in the adjoining conservation area. The planned formwork carriage construction allows unhindered access of construction site traffic in the longitudinal direction of the arched tunnel.Formwork carriage from rentable system components

For constructing the arched cross-section with a 50 cm wall thickness, Peri engineers planned a solution based on the Variokit system. The main components of the 10 m long formwork carriage are SRU steel walers, HDT main beams and SLS heavy-duty spindles.

A generously-sized, semi-circular tunnel crosses under the RN 88 highway in southern France; it ensures the safe passage of wild animals in the adjoining conservation area. The planned formwork carriage construction allows unhindered access of construction site traffic in the longitudinal direction of the arched tunnel.

For the transfer of loads in the strip foundations, HD 200 heavy-duty props are used. The extensive utilisation of system components significantly increases the cost-effectiveness of the formwork solution: alongside of the serial components were only a few purchased parts (couplings, timber formers) and consumable materials such as the formlining.

Peri supplied pre-assembled formwork elements and platforms with up to 2.50 m widths on a just-in-time basis to the jobsite. A supervisor supported the construction team during the final assembly of the formwork carriage directly on site.

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Page updated: February 2012

 

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