2.7 . Conclusions
The overhead MSS used in the above mentioned bridges and viaducts proved the importance of some features :
1 . The full autonomy of those machines allowed the construction of very high viaducts and viaducts over water without using auxiliary equipment such as : cranes , telescopic platforms , trucks , boats , etc .
2 . The standardization of components of the main structure allowed to build several bridges with different spans and different deck loads using the same MSS model – AP2005
3 . The list of features indicated in 2.4 above0 is characteristic of those MSS which are the base of those achievements .
6 . The site is cleaner by using these machines that don ’ t spread or leave wood parts and small pieces all over the site , a very important issue in what concerns safety and environment protection when working in so well-preserved areas and natural reserves .
7 . As described before , when choosing a MSS ( either underslung or overhead ) it is very important to consider :
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Autonomy of the machine . |
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Reusability of the machine in future jobs . |
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Total |
weight |
of |
the |
machine |
and |
its |
transportation cost from site to site . |
4 . These machines are bringing to the construction industry solutions to build multi-span bridges with great efficiency and remarkable construction speed .
5 . Bridges for High Speed Trains in Spain are already being designed for spans larger than 68 m which is an important step to reduce the cost of some of those viaducts with expensive foundations or very high piers .
References : PÓVOAS , Antonio Albuquerque : A modern concept of movable scaffolding systems . BE2004 , Porto , 2004 . PÓVOAS , Antonio Albuquerque : Viaductos de la Linea de Alta Velocidad Española . ACHE2008 , Valencia , 2008 .
PÓVOAS , Antonio Albuquerque : Movable Scaffolding Systems for 72m span in one casting stage . Bridge Maintenance , Safety , Management and Life-Cycle Optimization – Frangopol , Sause & Kusko ( eds ). Taylor & Francis Group , London , 2010 . ISBN 978-0-415-87786-2
PÓVOAS , Antonio Albuquerque : The utilization of movable scaffolding systems in large spans . IABMAS2010 , Philadelphia , 2010
PÓVOAS , Antonio Albuquerque : Building the World Largest High-Speed Train Arch Bridges with Movable Scaffolding Systems . MSLB , 2015
AP – Bridge Construction Systems – Portugal , Ltd . http :// www . ap-bridge . com /
4 / 2017