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Tunnel form in Mudéjar A-23 Highway

  Rubrica Tunnels

Client: Acciona Infraestructuras S.A.

Spain

Emplacement: Mudéjar A-23 Highway, Monrepós-Caldearenas section, Huesca
Année : 2012
Description:

Tunnel form consisting of a 6.53m self-supporting radio telescopic formwork and 12m advance for the tunnel lining in the mine and sidings of the Mudéjar A-23 Highway construction project on the high stretch of Monrepós-Caldearenas (Huesca, Spain) with a length of 2885m.
It is an extendable formwork in transverse direction for the concreting of the sidings, also allowing to execute the conical transition from the normal section of the tunnel to that of the siding of width 3m greater. In addition, the tunnel form is used in combination with the rest of the formwork that are delivered as are: formwork for the execution of the foundation beam, gutter and boot wall; three formwork for niches of different sizes; formwork for the junctions between gallery and tunnel; and the formwork of the connection and evacuation galleries.

For the widening or siding area, the design of the translation car and panels have the characteristic of being telescopic and modular in transverse direction. The opening is done by means of a hydraulic system that allows, once opened, to lift the special shell pieces to execute the siding up to a width of 3m. In this project there is a conical transition of 50m in length between the normal section of the tunnel and that of the siding, so the opening is carried out in several steps that allow to assemble the different modular parts of the panels that combine to make the progressive transition . The special pieces of the panels are transported and assembled from the transfer car itself.The niche and junction formwork are coupled to the formwork to concretize at the same time and achieve better finishes and less execution time.