What are the main factors that affect the cost of curtain wall fittings?

Now more and more glass curtain wall is used in the construction, glass curtain wall because of its beauty, by people's favor. But the cost of glass curtain wall fittings is not cheap, so what are the main factors that affect its cost? Next, let's analyze it in three simple ways.

In the same building will be different because of the use, resulting in the use of materials, structures, construction technology industry is also different. Generally, the curtain walls of high-rise buildings cost much more than those of the same type.

1, the influence of curtain wall structure on cost

Glass curtain wall accessories are the main frame, hidden frame, semi hidden frame, glass, point supporting five kinds of structure forms, under normal circumstances, when the use of similar materials, curtain wall height, wind load, glass plate size, price per square meter box below the semi hidden frame and frame, frame and hidden frame difference is up to 10 ~ 20%, semi hidden frame and hidden frame difference rate of about 5 to 10%. Hanging glass curtain wall height of about 10m of the whole glass price were lower than the point supported curtain wall, height 12m above the glass price are higher than the support type, the glass rib contact supporting structure for hanging type full glass curtain wall unit price is the highest, even up to more than 3000 yuan /m2, because the glass plate thickness, unit price very high; point supported and pure steel frame system, steel bar truss and cable system, pure stainless steel rod cable three main structure system, the price per square meter of YISHION cable tie is the highest, about 2500 to 3000 yuan /m2, pure steel frame system is the most low, about 1000 to 2000 yuan /m2. The influence of the structure of curtain wall on the cost is the most important factor. Because of the difference of material, height and size of the curtain wall of the same structure form, there is a big difference in the comprehensive unit price.

2, the use of materials, varieties, specifications of the impact on cost

The use of material specifications is another important factor affecting the cost of the curtain wall. The main materials used in the open frame, hidden frame and semi hidden frame glass curtain wall are aluminum alloy profiles, glass, structural adhesive, weather resistant adhesive and hardware. Among them, the first four kinds of influence are of great cost. Aluminum costs accounted for about 20 ~ 30% of the curtain wall unit; different surface treatment of aluminum price difference is also great, such as LD31RCS extruded aluminum anodic oxide film treatment profiles of about 23 thousand yuan / ton, while the price of aluminum surface fluorocarbon four coating is as high as 35 thousand yuan / ton, a difference of 40%. Effects of varieties and specifications of glass on the cost, because the glass curtain wall unit costs typically account for 20 ~ 50%, the single price slightly higher than the green body full toughened transparent glass, hollow glass price slightly lower than the equivalent thickness of a glass, but has less imported glass, promoting the use of environmentally friendly glass glass, such as LOW-E.

Structural adhesive, sealant costs accounted for about 5 ~ 8% unit curtain wall, the majority are still using imported brand-name single or double component (for hidden frame glass curtain wall structural adhesive and sealant), the price is 1.25 ~ 1.8 times of domestic similar glue, which is the most High German jiweite. The main material of point supported glass curtain wall used for supporting steel truss, stainless steel rod, cable, hanging rod and accessories, such as lock, adjust the joint, claw, bearing ball joints and base, weather resistant glue, which costs about steel truss supporting curtain wall unit from 10 to 20%, accounting for about 20 of the cost of glass 40%, stainless steel rod and cable accessories accounted for about 20 ~ 30%, there are many large curtain wall fittings imported rod cable connection system, about 10 ~ 25%, the sealant not for cost effect.

3 the influence of curtain wall height, wind load and partition size on the cost

The building curtain wall has a complete structure form, and the way of transmitting force is definite. The frame curtain wall is composed of a panel, a crossbeam and an upright post, and the point supporting curtain wall is composed of a glass plate, a supporting device, a supporting steel structure or a pull rod cable structure.

No matter how frames or point supported curtain, general is wind load control. The size of wind load directly correlated with curtain wall, according to the JGJ102- 96 of the provisions of the calculation, C area straight glass curtain wall surface wind load standard value of 30m Wk=2.53KN/m2 (W0=0.75KN/m2) 100m, height Wk height increased to 1.7 times the height of 200m, Wk increased to 2.3 times as 5.82KN/m2. The increase of wind load will increase the section size and wall thickness of aluminum profile, increase the section height of steel truss, profile section, wall thickness and the diameter of cable bar, and also increase the thickness of glass plate. Because the frame curtain wall suspension post is an eccentric tension member, beam for biaxial flexural members, generally by the deformation control; steel truss is mainly used for large span space structure curtain wall, mostly for eccentric compression members, mainly controlled by strength; rod cable tension self balance structure, mainly by the member stress state control; a frame glass curtain wall plate controlled by strength, and point supported glass plate is mainly composed of deformation control.

The engineering examples of curtain wall height, wind load, the grid size on the cost of the influence trend is more complex, not simple, technically wall cost increases with the increasing height, wind load, the grid size, but because of the section, truss layout, plate grid has many restrictions in architectural design the analysis of the need for multiple solutions, in order to determine the degree of influence on the cost.