Corrugated steel is a very durable steel, which is widely used in construction sites now, and it is a substitute material for concrete structural defects. Corrugated steel has many advantages, such as being very durable, shortening construction time, and being green. It is used in many environments. At present, corrugated steel is being used in rural areas, urban buildings and oceans. Moreover, the service life of corrugated steel is very long, which greatly saves the maintenance cycle of buildings, saves money and is beneficial to the environment. Below, Xiaobian will briefly introduce the types of corrugated steel components, the production technology and production equipment of corrugated steel.
I. types of corrugated steel members
there are three main structural forms in use in China: a. large highway culverts spliced by corrugated steel plates (with a span of more than 4m)? B. annular bellows? C. spiral corrugated pipe
ii. production process of corrugated steel
metal corrugated pipe is made of hot rolled steel plate (coiled plate) and then rolled or assembled, with a general thickness of 1.6-8 mm. What are the main steels? Q235(SS4), Q345, etc. At present, the common processing methods in China are rolling and molding, which can be divided into two types: one is to form a circle first and then a ripple; The other is to shape the steel plate into corrugated tiles and then assemble them into corrugated pipes? The first method is limited by the size and transportation conditions of the tube blank, and its diameter should not be too large, and the pipe diameter is generally .5-2.5? The length of each section is about 3 meters.
Corrugated pipes can increase the rigidity of pipe joints and the resistance strength to the axial pressure of pipes after the hot-rolled steel plates are corrugated. Before leaving the factory, hot-dip galvanizing technology and asphalt spraying on the construction site are adopted, and the service life is guaranteed by double-layer anti-corrosion treatment. Culverts built with such pipe joints are called steel corrugated pipe culverts.
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production process
self-assembly: plate rolling-shearing-drum rolling-welding-wave rolling-flange welding-punching (drilling)-hot dip galvanizing-assembly-asphalt anticorrosion-backfill construction
assembly? Type: plate rolling-shearing processing-cold bending forming-arcing-punching-hot dip galvanizing-assembly-asphalt anticorrosion-backfilling construction
III. Production equipment for corrugated steel
The production equipment for cold bending corrugated steel mainly includes: metal corrugated steel plate cold bending forming unit (single corrugated plate cold bending forming unit), metal corrugated steel plate arc starter (corrugated steel plate is rolled into a certain arc according to the design) and metal corrugated steel plate.
equipment cost: 2.5-6.7 million yuan for single corrugated plate cold bending forming unit (7, yuan for hydraulic pressure) and 2,-3, yuan for arc starter (35, yuan for numerical control)? The punching equipment of the whole pipe rolling machine is 14,-3, yuan, and some factories use a simple small drilling machine to drill multiple corrugated plates together, and two 35 rocker drills cost more than 1, yuan; Some manufacturers use punching equipment to punch multiple holes at the same time. A 5-ton hydraulic press and a set of punching dies need 3, yuan for punching.
The manufacturers of corrugated culvert pipe production equipment in Shenggang are: Wuxi Hongda Cold Bending Machinery Manufacturing Co., Ltd. and Hengshui Changlong Machinery Factory.
IV. Advantages and disadvantages of corrugated steel structure utility tunnel
Advantages:
1. Short construction period
Corrugated steel structure pipe gallery is an integral corrugated steel pipe (pipe diameter <: 3m) or assembled corrugated steel plates, the materials of which are processed and produced in the factory and assembled on site, and the construction speed is fast, which can save more than 3% compared with the construction period of traditional cast-in-place pipe gallery with concrete structure.
second, the price advantage
the corrugated steel structure is a thin steel shell, which is simple in structure and low in engineering cost. Take the 4x3.5m reinforced concrete pipe gallery as an example, its civil construction cost is about 8 million yuan per kilometer, while the φ4.5m corrugated steel pipe is used to replace it, and its civil construction cost is about 6 million to 7 million yuan per kilometer, and its use function can fully meet the demand. Compared with the traditional concrete structure, it has obvious advantages in cost.
3. Strong adaptability
Reinforced concrete structures are prone to cracks and other diseases when uneven settlement and deformation of the foundation occur, while corrugated steel structures have the ability to adapt to the deformation of the foundation and avoid structural damage caused by uneven settlement of the foundation.
IV. Standard environmental protection
Corrugated steel structure is designed and produced in a standardized factory, with simple structure and easy quality control. Corrugated steel structure reduces the amount of natural materials such as cement, gravel and sand, protects the environment, and is low-carbon and environmentally friendly.
Disadvantages:
1. Leakage can't be eliminated
Because the corrugated steel structure with assembled plates is fastened by overlapping plates and bolts, gaps can't be avoided at the overlapping plates and bolt hole joints. Although waterproof measures such as asbestos pad and weatherproof glue sealing holes are adopted in highway engineering, the leakage problem can't be well solved and the durability of waterproof effect can't be guaranteed.
second, the interface is the difficulty
the cross section of corrugated steel structure is mainly circular, tubular arch, oval and horseshoe, which leads to the complex design and processing of the interface between trunk pipe gallery and branch pipe gallery, and the structural stress design at the interface is also complicated due to its special stress structure.
in view of the many advantages of corrugated steel, corrugated steel is gradually replacing concrete. However, after all, corrugated steel is still a new building material, so it needs a gradual process to be accepted by the public, and it will take a very long time for corrugated steel to completely replace concrete in community facilities such as sewers, drainage and diversion. With the increasingly fierce market competition, corrugated steel will become a trend in order to greatly shorten the construction cost.
that's all about corrugated steel. I hope it can help you! ?
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