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2021-08-24 00:40
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The role of the cross arm: the angle iron fixed orizontally on the top of the pole, with a porcelain bottle on it, used to support the overhead wires.
The cross arm is an important part of the tower. Its function is to install insulators and fittings to support the wires and lightning protection wires and keep them at a certain safe distance according to regulations.
Crossarm classification
According to the purpose, it can be divided into: straight cross arm; corner cross arm; tensile cross arm.
According to the material, it can be divided into: iron cross arm; porcelain cross arm; synthetic insulation cross arm.
Instructions
Straight cross arm: only consider the vertical load and horizontal load of the wire under the condition of normal unbroken wire;
Tensile cross arm: In addition to bearing the vertical and horizontal load of the wire, it will also bear the difference in the tension of the wire;
Angle cross arm: In addition to bearing the vertical and horizontal load of the wire, it will also bear the larger unilateral wire tension.
According to the force of the crossarm, a single crossarm is used for straight rods or corner rods below 15 degrees, and the corner rods, tensile rods, terminal rods, and branch rods with a turning angle of 15 degrees or more use double crossarms. (In some areas, double crossarms are used for poles)
The cross arm is generally installed at a distance of 300mm from the top of the pole. The straight cross arm should be installed on the receiving side, and the cross arm of the corner pole, terminal pole, and branch pole should be installed on the side of the cable.
Cross arm and channel steel are generally customized according to the drawings provided by customers.
The specifications of the cross arm are named by the size of the angle steel and the length of the cross arm, such as: ∠63*6*1800
Hot-rolled ordinary channel steel size and weight specifications | ||||
Specification model |
size |
Theory weight |
||
height（h） |
Leg width（b） |
Waist thick（d） |
||
5 |
50 |
37 |
4.5 |
5.438 |
6.3 |
63 |
40 |
4.8 |
6.634 |
8 |
80 |
43 |
5 |
8.045 |
10 |
100 |
48 |
5.3 |
10.007 |
12.6 |
126 |
53 |
5.5 |
12.318 |
14#a |
140 |
58 |
6 |
14.535 |
14#b |
140 |
60 |
8 |
16.733 |
16#a |
160 |
63 |
6.5 |
17.24 |
16#b |
160 |
65 |
8.5 |
19.754 |
18#a |
180 |
68 |
7 |
20.174 |
18#b |
180 |
70 |
9 |
23 |
20#a |
200 |
73 |
7 |
22.174 |
20#b |
200 |
75 |
9 |
23 |
22#a |
220 |
77 |
7 |
22.637 |
22#b |
220 |
79 |
9 |
25.777 |
25#a |
250 |
78 |
7 |
24.999 |
25#b |
250 |
80 |
9 |
28.453 |
25#c |
250 |
82 |
11 |
35.26 |
28#a |
280 |
82 |
7.5 |
31.427 |
28#b |
280 |
84 |
9.5 |
35.823 |
28#c |
280 |
86 |
11.5 |
40.219 |
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Hot rolled light channel steel size and weight | ||||
Specification model |
size |
Theory weight |
||
height（h） |
Leg width（b） |
Waist thick（d） |
||
5 |
50 |
32 |
4.4 |
4.84 |
6.5 |
65 |
36 |
4.4 |
5.9 |
8 |
80 |
40 |
4.5 |
7.05 |
10 |
100 |
46 |
4.5 |
8.59 |
12 |
120 |
52 |
4.8 |
10.4 |
14a |
140 |
62 |
4.9 |
13.3 |
14 |
140 |
58 |
4.9 |
12.3 |
16 |
160 |
64 |
5 |
14.2 |
16a |
160 |
68 |
5 |
15.3 |
18 |
180 |
70 |
5.1 |
16.3 |
18a |
180 |
74 |
5.1 |
17.4 |
20 |
200 |
76 |
5.2 |
18.4 |
20a |
200 |
87 |
5.4 |
21 |
22 |
220 |
82 |
5.4 |
21 |
22a |
220 |
87 |
5.4 |
21 |
24 |
240 |
90 |
5.6 |
24 |
27 |
270 |
95 |
6 |
27.7 |
30 |
300 |
100 |
6.5 |
31.8 |
33 |
330 |
105 |
7 |
36.5 |
36 |
360 |
110 |
7.5 |
41.9 |
40 |
400 |
115 |
8 |
48.3 |
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