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Le Touquet – Paris-Plage, France

Pre M.,SETEC TPI | Thibault J.F.,Eiffage TP | Bourget A.P.F.,Egis Tunnels | Russo M.,BG Consulting Engineers | And 3 more authors.
Underground - The Way to the Future: Proceedings of the World Tunnel Congress, WTC 2013 | Year: 2013

In 2010, due to concerns relating to recent evolutions in contractual practices, the AFTES Technical Committee reactivated the Working Group (GT-25) with the objective to establish guidelines for identifying the "best contractual framework" to meet Owners, Engineers and Contractors expectations of well-balanced contracts, in a "winner-winner" approach in a French legal context, based upon a benchmark of foreign and French experiences. Recently, in France, a number of innovative contracts were experienced in the field of tunnelling activity (Design & Build, advance bid procedures). In parallel, the approach to risk management have developed and a new guideline is now in force (AFTES GT-32 "characterization of geotechnical uncertainties and risks for underground projects") and the French Public Authority included a risk management plan as a compulsory part of the tender documents. This paper presents the initial draft conclusions of this Working Group, including recommendations with regards to the Owner's relation with his Engineer and his Contractor and different contractual arrangements, assessment of risks categories to be addressed to avoid unclear share of responsibilities, recommendations with respect to change management during the works. © 2013 Taylor & Francis Group.

Cuccaroni A.,Reseau Ferre de France RFF | Veyron P.L.,SETEC TPI | Lacroix A.,Spie Batignolles TPCI | Russo M.,BG Consulting Engineers
Underground - The Way to the Future: Proceedings of the World Tunnel Congress, WTC 2013 | Year: 2013

Eastern European High Speed Railway Line Phase 2, linking Paris to Strasbourg includes the Saverne tunnel. In the first design phase, the tunnel was designed as a one double-track tube. Due to financial reasons, only the first section of the line was built. In 2008, RFF decided to build the last part. In 8 years, the design approach to tunnel safety has dramatically evolved. Thus RFF reviewed the whole detailed design including the last safety design regulations. The new study held by Setec outlined that two technical options for tunnelling were equally advantageous in terms of costs and planning. RFF decided to launch a Design and Build (D&B) procedure, a specific contractual form in France. The main reason pushing RFF to choose this procurement procedure was to involve the contractors since the design stage, hence developing the most efficient methodology for tunnel construction with considerations to the Contractor's own expertise and techniques. In 2010, the contract was awarded to a Joint Venture (JV) led by Vinci with the support of BG. This article explains the reasons yielding to choose a D&B contract and what needed to be explicitly defined in the tender documents. Moreover, it gives a first feedback of the construction in development. © 2013 Taylor & Francis Group.

Chanonier C.,DIADES | Raulet C.,DIADES | Martin F.,LERM | Carde C.,LERM | Resplendino J.,SETEC TPI
Beton- und Stahlbetonbau | Year: 2015

Als Teil der Wiederinbetriebnahme der PL1-Pipeline, die Raffinerien und petrochemische Standorte auf der Achse Fos-Lyon-Karlsruhe versorgt, wurden im Rahmen des sog. DIADES-Projekts Untersuchungen im Zusammenhang mit der Verstärkung, Instandsetzung sowie der Erdbebensicherheit einer Fußgängerbrücke durchgeführt, die die Überquerung der Flussaue der Durance ermöglicht. Die Brücke liegt südlich von Avignon und besteht aus acht vorgespannten Abschnitten mit einer Gesamtlänge von etwa 300 Metern. Das Hauptziel des Projekts war die Neubewertung der Erdbebengefahr unter besonderer Berücksichtigung neuerer französischer Vorschriften sowie die entsprechende Ertüchtigung des Bauwerks. Hierzu wurde eine neuartige Kopplung entwickelt, mithilfe derer die Instandsetzung durchgeführt werden konnte. Der vorliegende Beitrag fasst die erfolgreiche Umsetzung der Maßnahme zusammen. Southern Europe Pipeline: new life of a 1960s pipeline As part of the re-commissioning of the PL1 pipeline that supplies refineries and petrochemical sites on the Fos-Lyon-Karlsruhe axis, DIADES project managed, on behalf of SPSE, the studies into and the works relating to the reinforcement /rehabilitation and seismic compliance of a footbridge permitting the aerial crossing of the floodplain of the Durance. This study is based on the structural diagnosis performed by the laboratory of the LERM. This bridge, located south of Avignon, is a structure of eight prestressed isostatic spans with a total length of about 300 m. The main objectives of this project included its capacity to respect seismic compliance, taking into account the re-evaluation of seismic hazard in France. This work was carried out through a fully removable additional prestressed coupling to ensure the heavy maintenance of the pipeline. Using an original example of design and execution to make it possible to sustain the structure during the seismic compliance works, this presentation shows the value of the additional prestressing in the rehabilitation of existing structures, by emphasizing the importance of the diagnosis phase, focusing on the existing prestressing. It emphasizes the reliability of the various assumptions which are helpful for reinforcement dimensioning; these assumptions are based on the results of the pathological analysis of the structure including various structural investigations and inspections. Copyright © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Resplendino J.,SETEC TPI | Toutlemonde F.,French Public Works Research Institute
Indian Concrete Journal | Year: 2014

This chapter summarizes the development of UHPFRC knowledge and techniques until revision of the AFGC recommendations in 2013, emphasizing the evolutions which benefit from building and design feedback and from research efforts made on the last decade. Recent projects and achievements allow emphasizing the specific points of the design which justified the use of UHPFRC and the critical points of the execution which pass the field of traditional structures. Early researches on UHPFRC were made by Professor Bache in 1970 in Denmark under the development of CRC technology. This technology is still very active. In this technology, which a large percentage of metal fiber implemented in a cement matrix to produce prefabricated building structures (balconies, staircases) which are reinforced by traditional reinforcement calculated without taking into account the participation of mechanical fibers.

Lanquette F.,SETEC TPI
Assessment, Upgrading and Refurbishment of Infrastructures | Year: 2013

A number of beams (out of a total of 120) of the access bridges of the Saint-Nazaire - Saint-Brévin Bridge had some defaults affecting the prestress tendons of the precast concrete beams. Consequently, the owner decided, in addition to a detailed investigation of the beams, to reinforce the South access decks, from the abutment to the main bridge, which is a steel cable stayed-bridge. The aim of the reinforcement was to increase the prestress and to confer more ductility to the beams. The chosen solution consisted in reinforcing the beams with reinforced concrete cast on the lower part of existing beams. A comprehensive study of the influence of prestress tendon failure was made, modeling failures at various positions and taking into account an increasing number of broken tendons. Moreover, this study showed the underlying lack of resistance of the beams with regards to shear stress, shear stress reinforcement was thus designed using carbon fibers. The finite-element software Pythagore developed by Setec tpi allowed us to construct an original model composed of beam and slab elements. With this model a non-linear analysis was performed simulating the deterioration of prestress, progressively deactivating parts of the tendons.

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