1 Brief introduction of metal corrugated pipe culvert

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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.

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.

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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.

The Versatility of Corrugated Metal Pipe

While many people can easily picture a length of pipe under a driveway when asked if they have seen corrugated metal pipe (CMP), most people are unaware of the versatility the product. CMP has been produced since the early ’s, and it has evolved to fill the need for many requirements. Here are some benefits which might be applicable to your project.

1. Sizes and Shapes – CMP is made in round pipe diameters from 6” through 144” (and even larger under certain conditions), and in arched (Pipe Arch) and elongated (typically 5%) shapes where cover heights or clearance requirements are critical. Structural Plate, which are field-bolted corrugated plates, is also available to even further expand the size and shape options! (Conventional structural plate supports spans to 26’ and deep corrugated plates can handle clear spans to approximately 70’.)
2. Service Life – CMP is available in either steel or aluminum, and there are a number of coating options that may be applied to steel. Service life estimates of 100 years or more are common for applications, depending on the site conditions.
3. Applications – While often used at subdrainage, culvert and storm sewer sites, CMP can be found in a broad variety of other applications as well. These include underground detention systems, pond risers, dams and levees, caissons, pedestrian tunnels, relines of existing structures, grade separations, aggregate conveyor housings, and aerial conduits. Many other very unique applications have been provided over the years, so check with Contech if you have a special need!
   
   
   Example: CMP Riser Stacks for Air Venting
    
4. Strength – CMP is capable of handling vehicular and soil loadings which vary depending on the project requirements, and an option can typically be designed to suit your needs.
5. Hydraulics – In drainage applications, CMP may be supplied with a Manning’s “n” coefficient as low as 0.012 if needed in order to increase the flow capacity of a pipe size that is restricted by the available headroom.
6. Custom Fabrications – While CMP is factory-made in lengths that are typically 20’ to 24’ long, a site may require horizontal and/or vertical turns and bends, and there may be a need for other pipes to inlet or outlet into a pipe run. The ends of a run may need a skew or a bevel (or even a combination skew and bevel!) to match the site grading. Shop cutting and welding is available to eliminate the need for this work to be done in the field, and for faster installation time.
7. Acceptance and Shipping – AASHTO, AREMA, the FHWA, the FAA, the Army COE and most state DOT’s approve of the use of CMP. Steel pipe is produced from coils that are made in the USA, and all fabrication is completed in plants that are located across the country to minimize shipping costs. Over-sized loads may be accommodated, and pipes of varying sizes may be nested inside of each other on a truck to maximize the footage of pipe per truckload.

Please check-out Contech’s website at www.ContechES.com/cmp as well as the National Corrugated Steel Pipe Association (NCSPA) at www.NCSPA.org for much more information to assist you with your project!