Corrugated steel pipe & plate has dominated the culvert application market since its emergence in the construction industry more than 100 years ago. Corrugated steel culverts, storm drains and sub drains are vital to the protection of streets, highways and railroads.
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As the need for cost-effective, durable infrastructure has grown over the years, the corrugated pipe industry has responded.
Technological advancements provide more hydraulically efficient profiles and highly durable coatings, such as spiral rib pipe, polymer coatings, aluminized Type 2 steel and 2-ounce galvanized.
Corrugated steel pipe & plate culverts provide reliable, economical solutions to handle the flow, including debris, with minimum damage to the slope or culvert barrel. [hr]
Corrugated steel culverts maintain the advantage of the strength of steel with a variety of coatings providing long service life. With allowable fill heights over 100 feet and minimum covers as low as 12 feet, corrugated steel pipes & plates can be matched to the strength required. Established long-term materials properties ensure product performance throughout the design life.
Corrugated steel pipe & plate provides 'smooth' alternatives and fabricated fittings for superior hydraulics. Spiral rib pipe and fully lined CSP have the lowest Manning n-values of any storm sewer material. Small diameter helical CSP also has very low roughness coefficients as proven through independent testing. Fabricated fittings provide superior hydraulics by minimizing energy losses at junctions.
These factors, along with a variety of coating systems, mean CSP can meet any service life requirement. Galvanized, aluminized and polymer-coated CSP are just a few of the coating options. Expected service life can be determined using the NCSPA Service Life Guidelines.
Corrugated steel pipe & plate provides the lowest installed cost compared to other materials. This is due to the low up-front material costs plus the added advantages of reduced installation costs, especially in large diameters. CSP is one-tenth the weight of reinforced concrete pipe (RCP) and comes in lengths of 20 feet or longer. Add this to fewer joints and easy, positive connections and it equals an installation cost advantage.
1 Brief introduction of metal corrugated pipe culvert
Corrugated pipe culvert is a culvert constructed with metal corrugated pipe joints. After the 2.0-8.0mm thin steel plate is pressed into a corrugation, it is rolled into a pipe joint, which can increase the rigidity of the pipe joint and the resistance strength of the pressure of the pipe shaft. In order to prevent corroded corrugated pipe culverts, the inner and outer surfaces of corrugated pipe joints and fastening connecting bolts were hot-dip galvanized, with an average thickness of galvanized layer '84 μm. Compared with reinforced concrete pipe culverts, metal corrugated pipe culverts have the advantages of thin pipe joints, light weight, easy transportation and storage, simple construction process, fast assembly, and short construction period.
When installingmetal corrugated pipe, it can be arbitrarily assembled into any length according to the needs. If necessary, the pipe joint can be removed and moved to other places for construction. In areas lacking sand and gravel materials or in areas with low foundation bearing capacity, the advantages of metal bellows are more significant. Metal corrugated pipe culvert is a flexible structure that can adapt to large settlement and deformation, and has a certain earthquake resistance. The disadvantage of metal corrugated pipe culvert is that it consumes more steel than concrete pipe culvert, and its price is greatly affected by the market price of steel. In highway construction, steel corrugated pipe culvert has been used instead of reinforced concrete for culvert construction for more than 100 years. In , the United States pioneered the feasibility study of corrugated pipe culvert channels and culvert pipes. Since then, steel bellows have been used for culvert construction in highway construction in the United States, Canada, Australia and other countries. In , Japan formulated the technical specifications for the design of bellows and culverts. With the installation of bellows culverts all over the world, this structure has proved to be versatile. After China's reform and opening up, Shenzhen and Datong began to import finished corrugated pipe culverts from abroad for culvert construction; Shanghai Highway Administration, Shanghai Municipal Engineering Design and Research Institute, Shanghai Tongji University conducted dynamic and static load tests on metal corrugated pipe culverts The results show that metal bellows culverts can meet the design and use requirements; metal bellows culverts are also used in the construction of Qinghai highway. Practice has proved that metal bellows culverts in cold areas fully meet the requirements of culvert construction in highway construction.
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Corrugated Pipe Culvert
2 Advantages of metal bellows culverts.
1) Easy on-site installation, no need to use large equipment.
2) It is helpful to solve the problem of frost damage to the concrete structure of bridges and pipe culverts in the north.
3) Reducing the amount of cement, yellow sand, stones, and wood, which has environmental protection significance.
4) The structural force is reasonable, the load distribution is uniform, and it has a certain resistance to deformation. It has a strong ability to adapt to the deformation of the foundation, and has low requirements for the bearing capacity and flatness of the foundation.
5) Adopt standardized design, simple production and design, and short production cycle. The centralized production of the factory, the production is not affected by the environment, the performance is stable, the installation is convenient, and it is conducive to quality control.
6) The actual cost of the project is similar to or lower than the culvert of the same span.
7) Short construction period is the most obvious advantage. Civil engineering and pipe joint installation can be implemented separately, and then assembled as a whole.
8) It is conducive to improving the "staggered car jump" phenomenon at the junction of the soft ground structure and embankment, improving the comfort and safety of driving and reducing the cost of post-operation operation and maintenance.
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