Precast thin UHPFRC curved shells in a waste water treatment plant

Author(s): G. Delplace, Z. Hajar, A. Simon, S. Chanut, L. Weizmann
Paper category: Symposium
Book title: RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete
Editor(s): F. Toutlemonde, J. Resplendino
Print ISBN: 978-2-35158-130-8
e-ISBN: 978-2-35158-131-5
Publisher: RILEM Publications S.A.R.L
Pages: 49 - 58
Total Pages: 10
Language: English

Following the new European standards and in order to upgrade the existing waste water treatment plant of Achères near Paris, a design and build contract was attributed by the owner SIAAP to a consortium included the firm Eiffage TP and the architect Luc Weizmann. The extension plant project is partly based on a particular process of water biologic treatment called Biostyr®, a large tank in which water is filtered by micro-balls made of polystyrene. Due to its mechanical and durability properties, the BSI®, the UHPFRC developed by Eiffage TP, was chosen for the designing of thin architectural structures in such an aggressive area. Not less than 180 precast and pre-stressed thin shells were necessary to cover the whole 3500m² of the Biostyr® tank, according to the drawings of high waves imagined by the architect. This article presents the main steps of the project: the designing of the different structures, the suitability tests performed in a full scale mock-up to validate the casting method and to verify the K coefficients dealing with the real fibres orientation, the concreting and pre-stressing of the elements in the precast factory, and finally the implementation methods of the structure on the construction site.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00

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