The national stadium collects planning and design plans for the whole world;

July 2, 2002: 89 planning and design schemes were received;

065438+2003 10-February: Five qualified applicants for the National Stadium Project entered the second stage of bidding;

March, 2003 19-25: The jury passed the "Bird's Nest" scheme by overwhelming votes;

65438+February 24th, 2003: All preparations for the construction of the National Stadium of Beijing 2008 Olympic Games were ready, and a groundbreaking ceremony was held.

February 2004: The foundation pile of National Stadium 100 was completed, and the substantial structural construction of the "Bird's Nest" project began;

July 30, 2004: The safety and economy of Olympic venues became the focus, and the "Bird's Nest" was completely closed on July 30;

August 3, 20041day: The "Bird's Nest" cancelled the openable roof scheme and the style remained unchanged;

August 2004: "Bird's Nest" released renderings;

June 5438+February 2004: The main stadium of Beijing 2008 Olympic Games "Bird's Nest" resumed work;

May 9, 2005: Construction of the ground floor of Bird's Nest National Stadium;

June, 65438+May, 2005: Construction of the first floor of "Bird's Nest" National Stadium;

September 2005: 14: Construction of the second floor of "Bird's Nest" National Stadium;

June 2005 5438+ 10 June 2005 265438+ 10: The fourth floor of the National Stadium of "Bird's Nest" was constructed;

June 28, 2005 +20051October 28: the first hoisting ceremony of steel members of "Bird's Nest";

June 5438+065438+1October 65438+May 2005: the concrete main structure was capped one month in advance;

065438+2006 10: After the construction of the mixed soil structure is completed, all the pillars of the main steel structure are installed, and the case of roof steel structure installation is started;

April-May 2006: IOC members inspected the Bird's Nest;

August 26th, 2006 -3 1: The steel structures of the Bird's Nest are welded together and integrated as a whole.

September/KOOC-0/7, 2006: The National Stadium "Bird's Nest" project, after more than two years of construction, completed the last link of steel structure construction-overall unloading on September/KOOC-0/7.

Extended data:

The National Bird's Nest Stadium is a super-Grade A sports building, with the designed service life of the main structure of 100 years, the fire resistance grade of Grade I, the seismic fortification intensity of Grade 8, and the waterproof grade of underground works of 1. The main building of the project is a space saddle oval with a length of 333 meters from north to south, a width of 294 meters from east to west and a height of 69 meters.

The main steel structure forms a "bird's nest" structure woven by saddle-shaped steel truss in the whole giant space. The total steel consumption of steel structure is 42,000 tons. The concrete stands are divided into upper, middle and lower floors. The concrete structure of the stand is a reinforced concrete frame-shear wall structure system, with 7 floors underground 1 floor and above ground.

The steel structure and the upper part of the concrete stand are completely separated, and they are not connected with each other, but are enclosed in form, and the foundation sits on the connected foundation plate. The roof steel structure of the National Stadium adopts a double-layer membrane structure, that is, a transparent upper ETFE membrane fixed between the upper chords of the steel structure and a translucent lower PTFE sound-absorbing ceiling fixed under the lower chords of the steel structure and the inner ring side wall.

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