and supplemented by a recruitment interview773 euros for the insured and a demiplafond for health professionalsThe short term therefore nous we sufferThese seven managers had contracts in 1998Because the eulogy of the British plan endsHow to change the rights prizeThey are stable The Socialist candidate appears no hurry to meet them What is the need for an innovative companyThe unsuccessful will be many including in the ranks of the French banksIt is to make the main organization in charge of global financial stabilityBet won for GTM, which concluded as expected in the coming days, the construction of the carcass of the future headquarters of the CMA CGM shipowner in Marseille. This 147 metres high tower, which dominates the port, is already locally called the "lighthouse of Marseille". The first Pickaxe blows were delivered in July 2006, but this is only a year later that the silhouette of the building designed by British architect Zaha Haddid emerged from motorway bridges which encircle it. A silhouette very characteristic, soon covered with a "cloaking" double-skin glass emerging from the ground on a basis of 70 metres wide, curving to the centre before departing in fulfillment to the sky.
This architect designed an outer frame composed of 1.172 concrete poles, real puzzle for the Group of companies and design offices which won market Tower (JWG, Petit, Dumez Mediterranean, the work of the Midi and BCM). Oblong, the Poles are all different, with sections variable, prepared according to different angles and facade plans themselves differently inclined, inward or outward depending on the case. "It took a very sharp computer modeling verified by three different organizations, to determine the forces apply on this very misshapen set", explains Yann de Vaulx, technical manager of the project.
Mandatory, the development of a specific concrete by the laboratory of the Vinci Group, which was to combine a set of characteristics. He was first a very resistant material over time, able to withstand 60 megapascal (MPa) of pressure, as the batteries of the Millau Viaduct. "We also wanted a mixture that quickly takes to make these very slanted poles do not collapse when it removed formwork sufficiently early to meet construction deadlines", said technical director.
Laser cutting
Another feature, the inclination of the Poles, it was impossible to vibration techniques usually used to ensure a homogeneous concrete decision-making. In the end, the laboratory has designed a high-strength concrete, SCC and taking 15 MPa to twelve hours.
To test mixtures and solve a multitude of technical problems imposed by the design of this building out standards, a laboratory site has installed a few kilometres from Marseille. This is also that have been developed with mussels specific formwork, with a carrier chassis to work on different angles. Or formwork made of polystyrene cut laser, with armed canvas and resin sanded to some yet more complex poles (curves or merging...). "It is the first time that the technique of casting, inspired by the work of a sculptor for complex forms, is used in the building," Note Yann de Vaulx.
In addition to the smallness of the site on which is built the CMA CGM Tower, which has imposed feats of logistics, had also starting with the wind. "The working methods and tools specifically designed for this site were designed for winds of more than 200 km/h", said Manuel Estèves, Director of the project of the Tower in GTM. Without forgetting a imperative security, all the more essential when working in the middle of two highways on which some 60 million vehicles will be circulated during the three years of the site. "We are highly regarded", enjoys to remind...
