What is the structure of China Pavilion?

Building data of China Pavilion

Schematic diagram of the functional plan of China Pavilion: The national pavilion and the regional pavilion are divided up and down, and their shapes are coordinated with each other. The west, north and east sides of the venue are two-story regional pavilions on the ground, and the south side is China Plaza. It forms a command space with the north-south axis and constructs a spectacular urban spatial sequence, which can be described as a unique landmark building complex. The building area of China National Pavilion is 105879 square meters, and the structural system is steel frame-shear wall structure system, with a steel consumption of 23,000 tons. Four concrete core tubes are used as the main lateral resistance and vertical bearing system in the middle, and the elevation of the core tube structure is 68 meters. The cross section of each core tube is 18.6m× 18.6m, the outer spacing between adjacent core tubes is about 70m, the inner margin is 33m, and the roof side length is138m×138m.

Official architectural description

The National Pavilion stands in the center and stands out at different levels, becoming the main body of sculpture that embodies the elements of China and symbolizes the spirit of China-the crown of the East; The regional pavilion is spread horizontally, reflecting the national pavilion in the form of platform base, and becoming an open, flexible, people-friendly and multi-level city square; They are opposites and complement each other, which together form a unified whole and express the theme of the country's prosperity.

Important technical dimensions of China Pavilion building

In this China Pavilion, there are only 65,438+06 rigid steel columns under 34 meters, that is, box-shaped (800×800) rigid steel columns are set at four corners of each core tube, starting from the bottom plate and reaching 60 meters, which is the same as the height of the roof truss. From 33.75 meters, the whole large cantilever steel roof is supported by 20 giant steel braces. The bottom of the giant steel support is connected with the rigid column in the core tube, the middle part is connected with the core tube through layer-by-layer steel beams, and the top part is connected with the core tube through a steel truss and anchored on the rigid steel column. In order to provide the horizontal rigidity of the mega-steel diagonal brace bottom structure, the rigid floor (with steel beams in the floor) is set at 33.15m. The 33-meter rigid floor, 20 giant steel supports and the isomorphism between the floor and the roof truss layer constitute the main stress system of the whole steel roof, which provides load-bearing support for the floors.

Characteristics and difficulties of steel structure welding

Q345B and Q345GJC are low-alloy high-strength steels, which are engineering structural steels mainly used in China Pavilion. At present, they are widely used in super-high-rise steel structures with good weldability. Only with the increase of strength grade, the difficulty of welding will increase. According to the current data, the maximum thickness of the steel plate to be welded in China Pavilion is 60mm, which belongs to thick plate welding. It is also necessary to consider the welding shrinkage of giant steel supports and evaluate them. Although the whole tower structure is 68 meters high, it is not high. However, due to the characteristics of large cantilever structure, the aerial welding operation is mostly tens of meters above the ground, and the welding conditions are very steep. At the same time, the final stage of the National Pavilion project happens to be the winter of 65438+February, so it is necessary to consider the emergency protection measures for high-altitude welding in winter. Generally speaking, the China Pavilion is characterized by "large cross-section of components, thick steel plates and large amount of on-site overhead welding". Nevertheless, the construction party successfully completed the construction and acceptance of China Pavilion within the specified time! In strict accordance with the requirements of welding process, Shanghai Machinery Construction Co., Ltd. invited SGS, an internationally renowned third-party inspection agency, to conduct nondestructive testing welding process inspection. SGS conducted nondestructive testing on the butt weld and T-weld of I-beam and box girder on site, and found that the first pass rate of ultrasonic flaw detection exceeded 98% (the remaining 2% was also fully improved before completion), reaching the world advanced level, which can be described as "excellent construction quality and impressive".