Circular pipe culvert consists of two parts: the hole body and the mouth of the cave.
The tunnel body is the main body of the water passage, which is mainly composed of pipe body, foundation and joint. The entrance of the cave is the connection part of the tunnel body, subgrade and water flow, which mainly has two forms: splayed wall and straight wall.
The pipe body of circular pipe culvert usually adopts reinforced concrete, and the pipe diameters are generally 0.75m, 1m, 1.25m, 1.5m, 2m, etc. The pipe diameter is selected according to the drainage requirements, and prefabricated installation is mostly adopted, and the prefabricated length is generally 2m. When the pipe diameter is 0.5 m or 0.75 m, single-layer reinforcement shall be used, and when the aperture is above 1 m and 1 m, the wall thickness shall be not less than 6 cm when the pipe diameter is 0.5 m, not less than 8 cm when the pipe diameter is 0.75 m, and not less than 10 cm when the pipe diameter is125m. ..
Slab culvert is a kind of culvert with clear stress, simple structure and convenient construction. Slab culvert is mainly composed of cover plate, culvert abutment and foundation. The structural form of slab culvert is basically the same as that of single-span simply supported slab beam bridge, but the span of slab culvert is smaller.
Reinforced concrete box culvert with capping beam, the hole body is composed of reinforced concrete circular pipe, the shape of pipe joint is simple, the foundation engineering is simple, and it can be prefabricated in the finished product factory. When adding culverts to existing railways, circular culverts can facilitate jacking construction and have little impact on railway operation. However, its water flow area is much smaller than that of arch culvert and box culvert, and its flood discharge capacity is poor, so it is not suitable for river ditches with stones in floods, nor for interchange culverts or artificial irrigation channels. In addition, the higher the top fill of circular culvert, the larger the aperture, which is not only inconvenient for transportation and installation, but also increases the engineering quantity. Therefore, the commonly used circular pipe culvert is generally less than 2.5 m in diameter and the height of fill is less than 15m, so the circular pipe culvert is suitable for areas with small diameter and lack of sand and gravel.
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