Prefabricated steel bridge in China

In China, the prefabricated steel bridge has a very big development trend, and was finalized in 1965 for production and processing. In addition to being a steel bridge for combat readiness training, Bailey Bridge has long been widely used in rescue and disaster relief, traffic safety facilities engineering projects, municipal road engineering water conservancy and hydropower engineering projects, and structural reinforcement of dangerous bridges. For example, during the natural disaster period of 5.12 in 2008, many Bailey bridges will be used for rescue and disaster relief. Bailey bridges have a relatively dominant position in the forward transportation of rescue materials, the evacuation of the wounded and the withdrawal of the masses.

1. Characteristics and characteristics of prefabricated pavement steel bridges

The prefabricated building pavement steel bridge is a middle-piercing and bottom-bearing truss bridge. The main truss is formed by connecting the truss structure with nuts. Its prefabricated components are light and simple, with good tolerances, convenient and quick disassembly and assembly, fast construction speed, and strong adaptability; it is mainly used for the construction of single-span temporary roads and bridges, ensuring that the crawler load is 500 kg and the crawler load is less than 300 kg. All kinds of vehicles are blocked by rivers, aluminum alloy profiles for heat insulation and broken bridges, and valleys. The span of the road and bridge is a multiple of 3 meters, and the width of the roadway is 3.7 meters.

2. Detailed introduction of the structure of the prefabricated building pavement steel bridge

The prefabricated building pavement steel bridge is composed of the main structure, the connection system, the ground system and the bridge bottom system. Connected by load-bearing walls, each section of the truss structure is provided with two load-bearing walls; the load-bearing walls are paved on the ground, and end columns are installed on both sides of the road, highway and bridge. The main truss is placed on the bridge seat (support) and the support plate according to the support point of the end column, and the road, highway bridge and the dam foundation can be connected by an approach bridge. The whole bridge is equipped with many connecting system prefabricated components, such as throwing braces, impact-resistant braces, braces, connecting plates, etc., so that the road and highway bridges can form a stable interior space design structure.