The theoretical basis of corrugated metal pipe culvert design is plate and shell theory, material mechanics, computational mathematics, etc. There are more parameters for the design of corrugated metal pipe culverts. As the use of corrugated metal pipe culvert in the system is different, the focus of its design calculation is also different.
For example, the metal bellows culvert is used for the force balance element, which requires the bellows to have constant or little change in its effective area within the working range. For measuring elements, the elastic property of the corrugated metal pipe cullet is linear. For vacuum switch tubes as a vacuum seal, the vacuum seal, axial displacement, and fatigue life of the bellows are required. For valves as seals, the bellows should have certain pressure resistance, corrosion resistance, temperature resistance, working displacement, and fatigue life.
According to the structural characteristics of the corrugated metal pipe culvert, the bellows can be treated as a circular shell, flat cone shell, or circular plate composed of. The design calculation of corrugated pipe is also the design calculation of round shell, flat cone shell, or doughnut ring plate.
The parameters for the design calculation of corrugated metal pipe culvert are stiffness, stress, effective area, instability, allowable displacement, pressure resistance, and service life.
The stiffness of the corrugated metal pipe culvert is calculated, and the stiffness of the corrugated pipe is divided into axial stiffness, bending stiffness, torsional stiffness, etc. according to the different nature of load and displacement. At present, in the application of corrugated pipe, the majority of the force is axial load, displacement mode for the line displacement.
Corrugated metal pipe culvert is made of thin metal plate surface pressed into corrugations, rolled into pipe joints, which can increase the stiffness of the pipe joints and the resistance strength of the pressure on the pipe axis; the factory adopts hot dipping galvanizing process and construction site spraying asphalt, double-layer anti-corrosion treatment to ensure the service life; the culvert built with such pipe joints is called corrugated metal pipe culvert. The practice has proved that the construction of a culvert with a corrugated metal pipe culvert instead of metal-reinforced concrete has its incomparable superiority in terms of the construction period, construction cost, and environmental protection significance. And with metal corrugated pipe culvert construction, can greatly improve the comfort and safety of road traffic. It can help to solve the problem of frost damage to concrete pipe culvert structures in cold areas.
Culverts of highway projects are generally made of metal-reinforced concrete. Now, a metal corrugated pipe culvert is used instead of metal-reinforced concrete for culvert construction in China, and it is a new technology. In highway construction, the application of metal corrugated pipe culvert instead of metal-reinforced concrete for culvert construction has a history of more than 100 years. 1896, the United States took the lead in the corrugated pipe culvert channel, pipe culvert feasibility study. Subsequently, in the United States, Canada, Australia, and other countries the construction of highways, is used in the construction of metal corrugated pipe culverts for culverts. 1990, Japan highway design, specifications for the development of the technical specifications for the design of corrugated pipe culvert.
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