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Economical Advantage |
Comparison between Options of 12m Roof Purlin
building basic coefficient:
slop: 1:20
purlin span(m): 12
purlin interval(m): 2.0
basic wind press(KN/M2): 0.45
height change coefficient by wind load: 1.2
shape coefficient by wind load: -1.400
standard value of wind load(KN/M2): -0.798
standard value of roof weight(KN/M2): 0.20
standard value of live load(KN/M2): 0.5
standard value of snow load(KN/M2): 0.5
standard value of maintenance load(KN): 1.0
collateral load(KN/M2): 0.2
Option |
High Frequency Welding Purlin |
Open Steel Joist |
Double C section |
specification |
H300*150*4.5*6 |
600RJ2.75/2.0 ￠26.8*2.0 |
2C28025 |
nature |
Q235 |
Q235/Q345 |
Q235 |
weight |
25 Kg/M |
11.5 Kg/M |
19 Kg/M |
material price |
7200yuan/T |
8900yuan/T |
7500yuan/T |
unit price |
180yuan/M |
102yuan/M |
143yuan/M |
Comparison between Options of 15m Roof Purlin
Other coefficient same with above except for different span
Option |
High Frequency Welding Purlin |
Open Steel Joist |
Double C section |
specification |
H350*175*4.5*6 |
600RJ3.0/2.5 ￠26.8*2.0 |
no achieve |
nature |
Q235 |
Q235/Q345 |
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weight |
28.8 Kg/M |
13 Kg/M |
|
material price |
7200yuan/T |
8900yuan/T |
|
unit price |
208yuan/M |
115.7yuan/M |
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Refer to above sheet, Open steel joist can save 50% cost comparing with high frequency welding purlin in view of single piece.
remark:
- 550 indicates height of joist, RJ indicates roof joist, the abbreviation of it. 3.5 indicates thickness of top chord, 2.75 indicates thickness of bottom chord, 26.8*2.0 indicates specification of web pipe.
- The above unit price includes material cost, fabrication cost and painting cost. (50um two layers of acid primer was considered.)
- . The price showed in the sheet is for reference, the governing price will be confirmed according to market price.
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