on August 9, 2003 the morning, the national stadium project legal person cooperated the side signing ceremony to hold, take the Chinese letter Group as representative's unified body, ended in the national stadium project legal person to cooperate the side tender to be selected the human.

This unified body member including Beijing urban construction group Limited liability company, American Jinzhou holding Group and letter Group vassal state An Yueqiang Limited company.Water slide Will be selected the unified body and Beijing National capital Company sets up the project company together, the project company will obtain in 2008 the Olympic Games latter 30 year country stadium right of management.

The national capital company 30 years do not participation draw bonus, after the management expires, takes back the complete stadium. Beijing Olympic Organizing Committee provides the material demonstrated that up to present, Beijing in 2008 the Olympic Games main facility and was related the facility project legal person to tender the work to finish completely, completes the project legal person to tender the work national stadium and so on 6 projects, the total investment the approximately 20,500,000,000 Yuan, 85% namely 17,400,000,000 Yuan funds tendered through the project legal person, completed using market mechanism financing.

“bird nest” contour structure 　　Basic material 　　“the bird nest” the contour structure is mainly composed of the giant portal type steel frame,Plastic wood altogether has 24 clothes rack trestles, already completed 20 clothes rack trestle entire column and 2 under column hoisting. The national stadium construction goes against the delivering in person saddle shape, the major axis is 332.3 meters, the minor axis is 296.4 meters, the peak is highly 68.5 meters, the bottom is 42.8 meters highly.

　　Design proposal change 　　At maintenance “the bird nest” under the architectural style invariable premise, the new design proposal to questions and so on structural configuration, construction section form, material use factor has made the great scope adjustment and the optimization. In the original design plan may open the roof to cancel, the roof opens the mouth to expand, and reduced greatly through the steel structure optimization has used the steel quantity.

The great span room covers the support above 24 clothes rack trestles, the column distance is 37.96 meters. The principal truss covers the middle aperture regarding the room to arrange radially, some 22 pin principal trusses go nonstop to or go nonstop to close.Playground equipment In order to avoid presenting the too complex node, the few principal trusses interrupt nearby the inner rim. The steel structure uses the box shape component which massively becomes by the steel plate welding, the overlapping arrangement's principal truss and the roofing and set up the surface the inferior structure has formed “the bird nest” together the special construction modelling. The main stand part uses a reinforced concrete frame shearing force wall structure system, withdraws completely with the great span steel structure.

　Q460 steel products utilization 　　Mentions the Q460 steel products, most people possibly did not understand. “bird nest” structural design unusual novel, but this time builds its steel structure Q460 also to have many originalities: Q460 is one kind of low-alloy high-tensile steel, it when the stress intensity amounts to 460 megabars only will then have the plastic deformation, this intensity must be bigger than the common steel products, therefore the production difficulty will be very big. This is the home in constructs in the bird nest structure to use the Q460 specification for the first time the steel products; But this use's steel plate thickness amounts to 110 millimeters, is beforehand unique, in the national standards, the Q460 greatest thickness is also only 100 millimeters.

Before this kind of steel from Luxembourg, South Korea, Japan imports generally. In order to give “the bird nest” provides “good-fitting” Q460, started from September, 2004, the Henan Wuyang special steel mill's scientific researchers started are more than a half year of technical attacks, around 3 trial manufacturing obtained successfully finally. Now, was “the bird nest” the preparation Q460 steel products already started the volume production. in 2008, 400 ton independent innovation, has the intellectual property rights domestically produced Q460 steel products, will support “the bird nest” gagger steel bar.