1, and the material and structural form of the support meet the process design requirements; ?
2, stent preloading load and the ratio of the maximum construction load; ?
3. Provisions on concrete strength when the support is dismantled.
Bridges enable roads, railways or sidewalks to cross rivers, lakes, valleys, canyons or other roads. Bridges are mostly fixed, but some bridges can be raised or rotated. No matter what kind of bridge, the design and construction problems faced by engineers are to make the bridge structure firm and not sink or break due to weight.
Extended data:
The earliest bridges were built according to this idea. They are just tree trunks or stones across the river. Modern truss girder bridges usually use long hollow trusses made of steel or concrete as beams.
This makes the bridge light and strong. Bridges built in this way are called box girder bridges. Cantilever bridge: The bridge body is divided into several long and solid parts, similar to truss bridge, but each part is supported by the middle instead of the two ends.
This makes the bridge light and strong. Bridges built in this way are called box girder bridges. Cantilever bridge: The bridge body is divided into several long and solid parts, similar to truss bridge, but each part is supported by the middle instead of the two ends.