Characteristics and composition of steel box girder

Introduction:
Steel box girder, is a common structural form of long span bridges. It is generally used on bridges with large spans. It is called a steel box girder because its appearance is like a box.

Features:
In the long-span cable-supported bridge, the main beam of the steel box spans several hundred meters and up to several kilometers. It is generally divided into several beam sections for manufacturing and installation. Its cross section has wide and flat shape characteristics, and the aspect ratio reaches 1 : 10 or so.

composition:
Steel box girder is generally composed of a top plate, a bottom plate, a web, and a transverse partition, a longitudinal partition and a plus
The ribs and the like are connected by means of all welding. The top plate is an orthotropic bridge panel composed of a cover plate and a longitudinal stiffener.
The thickness of each typical steel box girder can be: cover plate thickness 14mm, longitudinal U-shaped rib thickness 6mm, upper mouth width 320mm, lower mouth width 170mm, height 260mm, pitch 620mm; bottom plate thickness 10mm, longitudinal U-shaped stiffener The inclined web is 14mm thick, the middle web is 9mm thick, the transverse partition is 4.0m, the thicess is 12mm, and the beam height is 2~3.5m.
Steel box beam is a commonly used structural form in engineering. In order to study the influence of the spacing of the diaphragm on the distortion of simply supported steel box girder under concentrated load, the simple supported steel box girder with different number of transverse partitions is set to compare the concentration. Distortion effect and rigid torsion effect under load, the maximum distortion effect is obtained with the number of diaphragms. Concentrated load is applied to the top of the box girder, and it is used according to four conditions: distortion, rigid torsion, symmetrical bending and eccentric load. The method of load decomposition is calculated.

ZhengJiang Great Wall Heavy Industry Technology Co.ltd (here and after called Great Wall ) is locacted at Zhengjiang city, South of Yangtze River, belonging to Yangtze River Delta economic zone, owning railway station of Shanghai-Nanjing and Shanghai-Beijing High-speed raillways; 30 kilometers away from Zhenjiang seaport, 50 kilometers away from Changzhou airport, 70 kilometers away from Nanjing airport,and YangzhouTaizhou airport; Great Wall has passed ISO Quality Management System Certificate; its WPS and welders have passed BV certification; the raw material and finished products are accepted by International Third Testing Institute such as SGS,CCIC,CNAS etc; In addition,Great Wall has several independent R & D patents

321-Type（British Compact-100） prefabricated highway steel bridge and 200-Type prefabricated highway steel bridge ( Bailey bridge) are main products of Great Wall, which has a full set of components production line for complete bailey bridge set. More than this, Great Wall has developed a kind of large span prefabricated D-Type bridge whose single span can be up to 91 meters, and has completed the load test already and engineering application of the whole bridge.

Great Wall has the surface treatment process of sand blasting, dip coating, spray painting, hot dip galvanizing, zinc aluminum alloy coating,etc with the annual output of more than 10000 tons.

Great Wall has good cooperation relationships with China Communication Group, China Railway Group, Powerchina Corporation, GEZHOUBA Group, CNOOC etc huge state-owned Key Enterprises in railway, road, international government procurement projects, and is also enthusiastic about the public welfare, such like supporting Hongkong Wu Zhi Qiao (Bridge to China) Charitable Foundation, building up all the footbridges for them and supporting China Shanxi TV building Charity Bridge for remote village.

Great Wall steel bridge is not only well- known in China, but also won good reputation overseas; the bridges made by Great Wall have been used all over the world exported to Indonesia, Nepal, Republic of the Congo, Myanmar, Mongolia, Kyrgyzstan, Mexico, Chad, USA, Trinidad and Tobago, Mozambique, Tanzania，Kenya, Ecuador , Dominica etc.

Furthermore, Great Wall has developed the container movement set independently, undertakes heavy steel structure fabricating business, promotes mechanical galvanization process for fastening parts.

The container movement set is not only supplied to domestic airplane manufacturing company, but also exported to country Haiti and so on meeting the demands of moving container in airport dock. The box girder, plate girder, guard rail such steel structures made by Great Wall are also well approved by clients. Great Wall mechanical galvanizing process made up the deficit of electroplating and hot galvanizing, showed extraordinary performance in field of environmental galvanization.

Great Wall considers the quality as company’s life, always accumulates the industrial experience of production and quality, improves production technology and efficiency, follows international specifications to control the quality, improves international competition, supplies the superior products and the best service to the clients with high standard, good quality and branding strategy.

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