Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

Buried structure steel pipe calculations


Buried steel structure calculations

    Refer to "Water Supply and Drainage buried steel pipeline structure design procedures."      
1 Basic Information 1800  
1) Material Properties  
Ep (kN/m2) En (kN/m2) Ee (kN/m2) Ee / En Br (m) Br/d1 ξ Ed (kN/m2)  
2.06E +08 5.00E +03 3.00E +03 0.60 10 5.46 1.02 3.06E +03  
f (N/mm2) α rs (kN/m3) rst (kN/m3) rw (kN/m3) νp νs    
215 1.20E-05 19 78.5 10 0.3 0.4    
A3 steel    
2) geometric parameters  
a (m) b (m) b0 (m) t (m) D (m) Design ground elevation (m) Control center Elevation (m) Ip (m4)  
0.2 0.6 1 0.016 1.8 18.61 14.16 0.001167  
D1 (m) D0 (m) r0 (m) r1 (m) t0 (m) Tube top elevation (m) Hs (m) Design outer level (m)  
1.832 1.816 0.908 0.916 0.014 15.076 3.534 15.28  
 
3) calculation of the coefficient  
rG1 rG, sv rGw rGs Rq  
1.2 1.27 1.2 1.27 1.4  
Wrap angle kgm kvm kwm kb  
90 0.102 0.157 0.102 0.096  
DL η γ0 ψ ψc  
1.25 0.9 1 0.85 0.9  
n Kst Kf DL    
2 2 1.1 1.5    
 
(2) load calculation      
1) Steel Weight G1k (kN / m) 7.16  
2) vertical earth pressure Fsv, k (kN / m) 123.01  
3) water pipe weight Gwk (kN / m) 25.43  
4) Design internal water pressure Fwd, k (kN/m2) 150.00    
Fwk (kN/m2) 100.00    
5) vacuum pressure Fvk (kN/m2) 50.00    
6) Ground heap load qmk (kN/m2) 10.00 ψq 0.5  
7) ground vehicle load qvk (kN/m2) 4.12    
Two volume steam -20 Qvk (kN) μd z (m) n (round number) d1 (m) d2 (m) d3 (m) ψq  
Rear wheels touch the ground 65 1 3.534 4 1.8 1.3 1.8 0.5  
8) groundwater buoyancy Ffw, k (kN/m2) 20.36  
 
3 strength calculation  
A ground vehicle load conditions  
N (kN) Molecular Denominator M (kN.m) σθ (kN/m2) ησθ (N/mm2)  
171.61 23.16 3.97 5.84 191,024.20 171.92 OK! ! !  
Ground stacked load case 2      
N (kN) Molecular Denominator M (kN.m) σθ (kN/m2) ησθ (N/mm2)  
171.612 24.81 3.97
6.25
203,708.74 183.34 OK! ! !  
Wall longitudinal stress σx (N/mm2) 138.98 -20.56    
△ T ° c 25    
Maximum combined stress discounted σ1 (N/mm2) 162.25    
Maximum combined stress discounted σ2 (N/mm2) 193.26    
γ0σ 193.26 OK! ! !  
 
4. Stability checking  
Conditions a ground vehicle load (kN/m2) 242.54 OK! ! !  
Case 2 ground stacking load (kN/m2) 254.29 OK! ! !  
Fcr, k (kN/m2) 673.93  
 
5 anti-float calculation  
ΣFGK (kN / m) 130.17  
8) groundwater buoyancy Ffw, k (kN / m) 37.30  
kf 3.49 OK! ! !    
   
6 stiffness checking  
Conditions a ground vehicle load ωd, max (mm) 0.057 OK! ! !    
Case 2 ground stacked loads ωd, max (mm) 0.079 OK! ! !    
ψ 0.035    
ΨD0 (mm) 63.560  
 
Description: Input variables  
  Result  

 

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