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1, anti-corrosion performance analysis Hot-dip galvanizing, also known as hot-dip galvanizing, hot-dip galvanizing is to temper the carbon steel or low-alloy structural steel into the molten zinc bath to obtain a steel with hot-dip galvanized layer, mainly used for steel prevention Atmospheric corrosion, hot-dip galvanizing has the advantages of strong anti-corrosion ability, good adhesion and hardness of galvanized layer, and long service life. At the same time, hot-dip galvanized carbon steel products in the range of pH 6-12.5, the protective film formed on the surface of the zinc layer, corrosion resistance is better, the hot-dip galvanized steel grating, the service life of at least 30 years maintenance-free.
The traditional non-slip steel plate with netting, because of the need to carry out rust removal and painting on the spot, the workload is large, the quality is not easy to be guaranteed, the pattern steel plate is easy to change and sag, causing stagnant water, every 3 years need to be done A comprehensive anti-corrosion maintenance can guarantee its performance.
2, economic performance analysis In the construction of the project, taking the current domestic commonly used calculation methods as an example, the formula affecting investment is:
Unit project construction drawing budget direct fee = (engineering volume * budget comprehensive unit price) * (1 + other direct fees)
In the steel structure, the engineering quantity is the weight of the steel used. The price of the traditionally used pattern steel plate is about 5,000 yuan/ton, calculated according to the life of 30 years, and the maintenance of the steel plate per square meter for 10 times. At 211.5 yuan (including labor costs), the cost of rust and corrosion protection is 60 yuan per square meter, then the comprehensive cost is 211.5+60*10=811.5 yuan, and the price of steel grating is about 7,000 yuan/ton. It is a one-time investment, about 30 yuan per square meter.
If only the price per ton of steel is judged, the price of the steel grating is 1.5 times that of the tread plate, but when it is converted into the price per square meter, the almost common steel grating is economical than the tread plate. It can be seen from Table 1 that the steel grating is in the stair step and the use of the operating platform is more than 50% higher than the tread plate economy.
Table 1 Comparison of economic performance of steel grating and tread plate Serial number model Price (yuan/t) Self weight (kg/m2) Price (yuan/m2) Comprehensive price (yuan/m2) 1 5mm pattern steel plate 5000 42.3 211.5 811.5 2 G253/30/100 7000 25.5 178.5 208.5 3 G303/30/100 7000 33 231 261 4 G304/30/100 7000 42.75 199.25 329.25
3, mechanical performance analysis When selecting the plate type, considering the chemical industry, the general live load 2KN/M2, the maintenance load 2KN/M2, the secondary beam spacing 1000mm-1200mm, the stair tread plate, the steel operating platform plate generally adopts G253/30/ 100 G255/30/100 G325/30/100 G325/30/100 flat flat steel grate, open groove cover, high width walkway, trestle, etc. G405/30/100 G405/30/50 G505/30/100 G605/30/100 flat steel flat steel plate, I type or toothed steel grating can also be used, and a few important parts can also be made of stainless steel "target=_blank> stainless steel, aluminum alloy, etc. Other metal material grid plate products, Table 2 is a comparison of the performance of several commonly used flat steel steel gratings and tread plates, for reference.
Table 2 Comparison of strength and stiffness properties of steel grating and tread plate
Serial number
model
Maximum span kpa/mm
Maximum span load and deflection mm
Deflection mm under 2KN/M2 load
Deflection mm under 4kn/m2 load
Allowable deflection L/150
Finished product weight kg/m2
1
G253/40/100
1050
6.8/5.25
1.58
3.04
2.25
20
2
G255/40/100
1350
5.33/6.75
2.57
4.8
9
30.7
3
G304/30/100
1500
7.4/7.5
2.14
4.27
10
42.75
4
5mm tread plate
1000
4.58
8.36
6.67
42.3
Conclusion: G253/40/100 is 52.7% lighter than the pattern steel plate, and the deflection under the same load is only 32.3% of the pattern steel plate, which can replace the tread plate.
When G255/40/100 is lighter than the pattern steel plate by 34.7%, the deflection is only 56% of the pattern steel plate, which can be used preferentially.
When the G304/30/100 and the grain steel plate have the same mass, the span can be increased by 35%, and the deflection of the same load is only 50% of the grain steel plate, which can be used for the larger span structure layer.
The weight of the steel grating in Table 2 is lighter than that of the patterned steel plate, the span is larger, and the material is relatively saved. Under the same load, the deflection of the steel grating is small and the deformation is small, so the strength and rigidity of the steel grating are higher. Under the production environment of chemical equipment, it has higher reliability, improves its safety factor in production and application, and better guarantees the smooth operation of production equipment.
Conclusion: Through the comprehensive analysis of steel grating and traditional pattern steel plate in petrochemical plant and stair platform in terms of anti-corrosion performance, economic performance and mechanical properties, the following conclusions are drawn.
(1) The galvanized steel grating has many advantages such as economical safety in the traditional pattern steel plate, and the performance price is higher. When designing and selecting, try to select the appropriate steel grating model. In practical application, the steel grating can be mixed with the patterned steel plate. Used to meet more reasonable structural requirements, production needs and more obvious economic benefits.
(2) The steel grating is worthy of all relevant reference units in the new construction, renovation and expansion, and maintenance projects to promote, so that this new type of building materials can be widely popularized. Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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