Lanjarón Viaduct - Spain
Design, supply and installation of temporary structures, Launching of the new bridge
 

Client

Spanish Ministry of Civil Works
Dirección General de Carreteras

Engineer

José Antonio Torroja

Main Contractor

DRAGADOS OBRAS Y PROYECTOS

Specialised Subcontractor Launching works

CTT-Stronghold (VLS España)

VSL Entity

VSL Spain
VSL (Switzerland) Ltd.
Heavy Lifting Department

Date

2002

Project Description

AN INNOVATIVE SOLUTION WITH VSL HEAVY LIFTING FOR SINGLE SPAN BRIDGES

The Spanish Ministry of Civil Works decided to improve the access road to the Alpujarras area and built the Lanjaron viaduct in the province of Granada. The depth of the valley to be spanned and the necessity to preserve the rests of a historical bridge built in the 11th century prevented the use of intermediate bearings and a launching solution was adopted.

The structure consisted of a bow string formed by two parallel trusses with a single span of 114m and a weight of 504t.

VLS Spain, supported by the Heavy Lifting expertise from VLS Switzerland, responsibilities covered  the launching works including the design, supply and installation of temporary structures.

The installation of the structure was followed by the launching operation consisting of two distinct phases. Covering the first 64m, the structure was loaded with a counter-weight and was moved with the help of two VSL SLU-70 units.Using this advanced position, the cables for the second phase were installed from the extremity of the bridge to the towers and concrete structures installed at the other side of the valley.

The principle of the movement during the second phase was like the effect of a fishing line that would take one extremity of the bridge from the opposite abutment and pulled it across the valley. 


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