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Bridge cross section selection

  • Categories:Zhongrui News
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  • Time of issue:2019-05-28 14:28
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(Summary description)Cross section selection SD=n1·π·d1/4+...+nn·π·d*2n/4(mm*2) S=K·SD/ n The total cross-sectional area of the SD-cable (mm2); N1, n2...nn same type specification cable number D1, d2...dn factory cable diameter of the same model specification (mm); K—the residual coefficient, taking 1.10-1.25; N—filling rate, the power cable takes 45%-50%, and the control cable takes 50%-70%. 2. Banggao (side height) selection Non-ladder bridge height (side height) H value determination principle: a. The control cable should not be laid 2/3 of the state (edge height); b. For power cables, do not exceed 2/3 of the state (edge height). The height of the ladder bridge (side height) is determined as: the value of H determined by the above principle plus 25mm (ie H+25mm) Note: When the number of cables is too large, it can be laid by multi-layer bridge; when the number of cables is small, cables of different natures can be laid in the same bridge, but the partitions are separated in the middle. The distance between the layers of the cable trays is Control cable>=200mm Power cable>=300mm Mechanized laying cable >=400

Bridge cross section selection

(Summary description)Cross section selection

SD=n1·π·d1/4+...+nn·π·d*2n/4(mm*2)

S=K·SD/ n

The total cross-sectional area of the SD-cable (mm2);

N1, n2...nn same type specification cable number

D1, d2...dn factory cable diameter of the same model specification (mm);

K—the residual coefficient, taking 1.10-1.25;

N—filling rate, the power cable takes 45%-50%, and the control cable takes 50%-70%.

2. Banggao (side height) selection

Non-ladder bridge height (side height) H value determination principle:

a. The control cable should not be laid 2/3 of the state (edge height);

b. For power cables, do not exceed 2/3 of the state (edge height).

The height of the ladder bridge (side height) is determined as: the value of H determined by the above principle plus 25mm (ie H+25mm)

Note: When the number of cables is too large, it can be laid by multi-layer bridge; when the number of cables is small, cables of different natures can be laid in the same bridge, but the partitions are separated in the middle.

The distance between the layers of the cable trays is

Control cable>=200mm

Power cable>=300mm

Mechanized laying cable >=400

  • Categories:Zhongrui News
  • Author:
  • Origin:
  • Time of issue:2019-05-28 14:28
  • Views:
Information
Cross section selection
 
SD=n1·π·d1/4+...+nn·π·d*2n/4(mm*2)
 
S=K·SD/ n
 
The total cross-sectional area of the SD-cable (mm2);
 
N1, n2...nn same type specification cable number
 
D1, d2...dn factory cable diameter of the same model specification (mm);
 
K—the residual coefficient, taking 1.10-1.25;
 
N—filling rate, the power cable takes 45%-50%, and the control cable takes 50%-70%.
 
2. Banggao (side height) selection
 
Non-ladder bridge height (side height) H value determination principle:
 
a. The control cable should not be laid 2/3 of the state (edge height);
 
b. For power cables, do not exceed 2/3 of the state (edge height).
 
The height of the ladder bridge (side height) is determined as: the value of H determined by the above principle plus 25mm (ie H+25mm)
 
Note: When the number of cables is too large, it can be laid by multi-layer bridge; when the number of cables is small, cables of different natures can be laid in the same bridge, but the partitions are separated in the middle.
 
The distance between the layers of the cable trays is
 
Control cable>=200mm
 
Power cable>=300mm
 
Mechanized laying cable >=400

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