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Zuhause > Brancheninformationen > H beam is a new type of steel for economic construction
Brancheninformationen

H beam is a new type of steel for economic construction

2018-09-12

H-shaped steel is mainly used for engineering, plant and equipment, mechanical equipment, bridges, highways, private houses, etc.; good mechanical properties and physical properties, solid, energy saving and environmental protection effect. H-section steel is an economical section steel, widely used in industry, construction, bridges, oil drilling platforms, etc. It is estimated that in 2005 China's demand for H-shaped steel is about 2.5 million tons, and the demand in 2010 is 5 million tons, but at present China The annual production capacity of H-beam is 1.2 million tons, and the market demand is very large.



The main advantage is that H-shaped steel is a new type of economic construction steel.

The shape of the H-section steel is economical and reasonable, and its mechanical properties are good. In the rolling, the points on the section are evenly distributed and the internal stress is small. Compared with ordinary I-beams, the H-section steel has the advantages of large section modulus, light weight, and metal-saving advantages. The structure is reduced by 30-40%; because the legs are parallel inside and outside, the leg ends are right angles and assembled into components, which can save welding and riveting workload by 25%. It is commonly used in large buildings (such as factory buildings, high-rise buildings, etc.) that require large bearing capacity, good section stability, and bridges, ships, lifting and transport machinery, equipment foundations, supports, and foundation piles.

H-shaped steel is an economical section steel material with more excellent sectional mechanical properties developed from I-shaped steel. The section is named after the same as the English letter “H”. Its characteristics are as follows:

The flange is wide and the lateral stiffness is large. Strong bending ability.

The two surfaces of the flange are parallel to each other to make connection, processing and installation easy.
Compared with welding I-beams, the cost is low, the precision is high, the residual stress is small, no expensive welding materials and weld seam inspection are needed, and the manufacturing cost of the steel structure is saved by about 30%.

Under the same section load. Hot-rolled H-steel structures are 15%-20% lighter than traditional steel structures.

Compared with the crucible structure, the hot-rolled H-steel structure can increase the use area by 6%, while the structural self-weight can be reduced by 20% to 30%, and the structural design internal force can be reduced.

H-shaped steel can be processed into T-shaped steel, honeycomb beams can be combined to form a variety of cross-sectional forms, which greatly satisfy the engineering design and production needs.

H-section steel is mainly used for engineering, plant and equipment, mechanical equipment, bridges, highways, private houses, etc.; good mechanical and physical properties, solid, energy saving and environmental protection. H-section steel is an economical section steel, widely used in industry, construction, bridges, oil drilling platforms, etc. It is estimated that in 2005 China's demand for H-shaped steel is about 2.5 million tons, and the demand in 2010 is 5 million tons, but at present China The annual production capacity of H-beam is 1.2 million tons, and the market demand is very large.

Basic features 1. High structural strength Compared with I-beam, the section modulus is large, and when the bearing conditions are the same, it can save 10-15% of metal.

2. The design style is flexible. In the case of the same beam height, the opening of the steel structure can be 50% larger than the opening of the concrete structure, thus making the building layout more flexible.

3. The light weight of the structure is lighter than the self-weight of the concrete structure, and the reduction of the structure's own weight reduces the internal forces of the structural design, so that the foundation structure treatment requirements of the building structure are low, the construction is simple, and the construction cost is reduced.

4.Structural stability Highly hot-rolled H-shaped steel structure, scientific and reasonable structure, good plasticity and flexibility, high structural stability, suitable for building structures subjected to vibration and shock loads, strong ability to resist natural disasters It is particularly suitable for the construction of some earthquakes. According to statistics, steel structures dominated by H-shaped steels have suffered the least damage in the world with more than seven devastating earthquake disasters.

5. Increase the effective use of the structure area Compared with the concrete structure, the column area of the steel structure is small, which can increase the effective use of the building area, depending on the form of the building, can increase the effective use of the area of 4-6%.

6. Compared with welded H-section steel, provincial workers can save labor and materials, reduce raw material, energy and labor consumption, have low residual stress, and have good appearance and surface quality.

7. Easy to machine and easy to connect and install the structure, but also easy to remove and reuse.

8.Environmental protection H-shaped steel can effectively protect the environment. It is embodied in three aspects: First, compared with concrete, dry construction can be used, resulting in less noise and less dust; Second, due to lighter weight, the amount of foundation construction Less, the destruction of land resources is small, in addition to a large number of reducing the amount of concrete, reducing the amount of stone mining, is conducive to the protection of the ecological environment; Third, after the expiration of the service life of the building structure, the amount of solid waste generated after the demolition of the structure is small, scrap resources High recovery value.
9. High degree of industrialization High degree of industrialization of steel structures mainly consisting of hot-rolled H-section steels, high degree of industrialization, ease of mechanical manufacturing, intensive production, high precision, easy installation, easy to guarantee quality, can build a real house production factory, bridge production factory , industrial plant production factories. The development of steel structures has created and stimulated the development of hundreds of new industries.

10. The construction speed of the project is small, and it is suitable for all-weather construction. It is affected by the weather conditions. The construction speed of the steel structure made of hot-rolled H-shaped steel is about 2-3 times of the construction speed of the concrete structure, the capital turnover rate is doubled, the financial cost is reduced, and the investment is saved. Taking the “Jinmao Building” in Pudong, the “highest building in China”, as an example, the main body with a body of up to 400 meters in length completed the structural capping in less than six months, while the steel-concrete structure required a two-year duration.

H-beams are divided into wide flanges H-beams (HW) flanges H-beams (HM) narrow flanges H-beams (HN) thin-walled H-beams (HT) H-beams (HU)

Height H × width B × web thickness t1 × wing thickness t2, such as H-beam Q235, SS400 200 × 200 × 8 × 12 is expressed as 200mm wide and 200mm web thickness 8mm, flange thickness 12mm wide flange H-shaped steel Its brand name is Q235 or SS400. Hot rolled H-beam representation.

H-beams are divided into three categories: wide-flange H-section steel (HW), narrow-flange H-section steel (HN) and H-shaped steel pile (HU). The expression method is: height H × width B × web thickness t1 × wing thickness t2, such as H-beam Q235B, SS400 200 × 200 × 8 × 12 is 200mm high 200mm wide web thickness of 8mm, thickness of 12mm Wide flanged H-beam, grade Q235B or SS400.

Domestic H-beam manufacturers currently mainly include Maanshan Iron and Steel Co., Ltd. in Maanshan City, Anhui Province, Laiwu Iron and Steel Co., Ltd., Rizhao Steel, Jinxi Steel and Changzhi Iron & Steel. Masteel is the first company to produce H-beam steel in China.

On September 1, 2005, the China Famous Brand Strategy Promotion Committee authorized by the General Administration of Quality Supervision, Inspection and Quarantine formally established Maanshan Iron and Steel Corporation (referred to as Maanshan Steel) as the famous brand product of China.

On September 1, 2005, the China Top Brand Strategy Promotion Committee authorized by the General Administration of Quality Supervision, Inspection and Quarantine formally established Shandong Laiwu Iron and Steel Group Co., Ltd. (referred to as Laiwu Steel) for its hot-rolled H-beams as a Chinese famous brand product.

The difference between the I-beam HWHMHNH steel section I-beam flange is variable section by the thickness of the web, the outer thin; H-beam flange is equal section HW HM HN H is the general name of the H-beam, H-beam is welded; HW HM HN is hot rolled

HW is basically equal to H-beam height and flange width; it is mainly used for steel core column in reinforced concrete frame structure column, also called stiffening steel column; mainly used for column in steel structure.

HM is H-beam height and flange width ratio is generally 1.33 ~ ~ 1.75 Mainly in the steel structure: used as a steel frame column in the frame structure to withstand the dynamic load used as a frame beam; for example: equipment platform

HN is the proportion of H-beam height and flange width greater than or equal to 2, mainly used for beams; I-beam is equivalent to HN-type steel;

Welding H-beam high-frequency welding H-shaped steel and hot-rolled H-shaped steel difference
H-beam has two production methods: hot rolling and welding. Welded H-beams are cut to the appropriate width for strips of suitable thickness and welded together at the edge and waist sections in a continuous welding assembly. The welding of H-shaped steel has the disadvantages of large consumption of metal, low economical production, and difficulty in ensuring uniform product performance. Therefore, H-shaped steel production is mainly based on rolling. The main difference between H-beams and ordinary I-beams in rolling is that the latter can be rolled in a two-roll pass, the former requiring rolling in a universal pass. The hot-rolled H-beam steel produced by adopting the near-final continuous casting blank and the four-roll universal rolling process has outstanding features such as high quality, high efficiency, low consumption, and low cost, and has tremendous advantages in improving the quality of steel materials and improving the economic efficiency of use. Superiority. High frequency welding of H-beams: Two pieces of shunt end piece (T profile, H59-1 brass) and resistor piece (thickness 1.5, width 20, length 45, manganese copper plate) 5; high frequency heating; Copper-phosphorus solder welding; Requirements: Brazing process ≤ 1min, focus on solving: positioning and welding problems (in the past brazing process using gas welding method). Main technical and economic indicators: No oxidation on the surface of welded products, welding quality is higher than gas welding, reliable welding of end piece and resistor plate, no melting and deformation of welding, guarantee of resistance performance of diverter, double production efficiency. High frequency welding light H The technical characteristics of steel are: (1) welding speed is fast, can reach 18-45m/min; (2) small thermal impact, easy to control deformation of H-shaped steel; (3) can weld H-shaped steel with different material combinations; (4) can Achieve micro-tensile production and reduce welding stress. Technical level: (1) High dimensional accuracy of the cross-section; (2) Excellent cross-section performance; (3) Features of cross-section dimensions that can be customized according to user requirements. When the specifications and material are the same, the hot-rolled H-beam can completely replace the welded H-beam, and the former is of better quality than the latter. Under normal circumstances, hot-rolled H-shaped steel should be adopted for multi-storey buildings in the structural design. For the light-steel plant with portal frame structure, the amount of steel used for welding the variable section H-shaped steel is better, but the project cost cannot The reason for the savings is that the processing volume of hot-rolled H-shaped steel is smaller and the construction period is shorter. If the comprehensive economic benefits (including the project is put into use) are calculated, it will play a decisive role in the construction period.




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