1. Why the steel bars of different diameters are bundled having a different number of bars in each bundle?
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The steel bars are carried from the seller's destination to the purchaser's construction site by truck, tractor, or any such transporting vehicle. The bundled steel bars help to ease the loading & unloading work in a lesser time. The weight of the bar bundle is kept nearer to 50kg. so that two persons can lift them easily, by holding on to each end of the bundle.
The steel bars are manufactured having a standard length of 12m. for all types of bars, having different diameters. The weight of an individual bar having different diameters varies for a given length of 12m. The larger the dia. of a bar, the more the weight will be.
So, in order to keep the bundle wt. nearer to 50kg., the only way that can be achieved is by keeping the different number of bars in a bundle, according to the bar diameter.
2. What is the number of TMT bars in each bundle, having different diameters?
The different diameter bars with the number of bars in each bundle and the weight of a single bundle are given in the table below.
|
Bar dia. in mm. |
Bar/ bundle in nos. |
Bar wt. in kg/m. |
Std. length in m. |
Bundle wt. in kgs. |
|
8 |
10 |
0.395 |
12 |
47.40 |
|
10 |
7 |
0.617 |
12 |
51.83 |
|
12 |
5 |
0.89 |
12 |
53.40 |
|
16 |
3 |
1.58 |
12 |
56.88 |
|
20 |
2 |
2.47 |
12 |
59.28 |
|
25 |
1 |
3.85 |
12 |
46.20 |
|
32 |
1 |
6.31 |
12 |
75.72 |
3. What is the tolerance or roller margin for the steel bars as per IS-1786(2008)?
The rolling margin for the different dia. bars is specified in IS-1786, and I have calculated the purchase range by weight for each diameter bar. If the weight of the steel bundle goes above or below the given range, then you should discard such bundles.
Given below is the table, having bundle weight and the permissible purchase range by weight for different diameter bar
|
Bar dia. in mm. |
Bundle wt. in kgs. |
Tolerance IS-1786 in % by wt. |
Purchase Range in kgs. |
|
8 |
47.40 |
±7 |
44.08 - 50.72 |
|
10 |
51.83 |
±7 |
48.21 - 55.46 |
|
12 |
53.40 |
±5 |
50.73 - 56.07 |
|
16 |
56.88 |
±5 |
54.03 - 59.72 |
|
20 |
59.28 |
±3 |
57.50 - 61.05 |
|
25 |
46.20 |
±3 |
44.81 -47.59 |
|
32 |
75.72 |
±3 |
73.44 - 78.00 |
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