How to classify bridges?

According to span size and multi-span total length, it is divided into: extra large bridge, large bridge, medium bridge, small bridge and culvert. These include:

1. Extra large bridge: the total span of multiple holes is ≥ 500m, and the span of single hole is ≥ 100m.

2. Bridge: The total span of multiple holes is ≥ 100m, and the span of single hole is ≥ 40m.

3. Medium bridge: 30m

4. Small bridge: 8 meters ≤ total length of porous span ≤300 meters, 5

5. Culvert: the total length of perforated span.

Span direction

1, except for the positioning axis, grid lines are called positioning lines, which are used to determine the dimensions of modular parts. Modular grid can adopt uniaxial positioning, biaxial positioning or both, which should be determined comprehensively according to the conditions of architectural design, construction and component production, and continuous modular grid can adopt uniaxial positioning. Two-axis positioning can be used when modular grids need to be spaced to produce intermediate areas.

2, positioning axis should coincide with the main grid axis. Distance between positioning lines (such as span, column spacing, height, etc.). ) shall conform to the module size to determine the position and elevation of the structure or member. The connection between structural members and plane positioning lines should be conducive to the unification and interchange of horizontal members, beams, slabs, roof trusses, vertical members, walls and columns, and make the structural members bear reasonable forces and simplify the structure.