It is really very easy to calculate quantities for Steel Structures. Commonly Steel Structures include Steel Columns, Beams, Rafters, Trusses, Haunches, Apex, etc. We can easily calculate the length of these components using a given drawing base on the unit weight and size of each iron to be used.
Note: Unit weight can be different even for the same size of iron where thickness is not the same. Therefore, the price will be changed for each steel since the price of steel base on its weight.
Then we should have a proper idea what are the required amount of steel plates with its thickness, nuts & bolts, washers, welding rods, etc. Most of the time you will be given drawings of each section so you can calculate the required material quantities easily and quickly.
When estimating required amount of welding rods it is necessary to know the total weight of steel structure. In fact in steel structure it is approximately we use 14-16 Kg of welding rods per one ton. Therefore by estimating steel structure weight, we can multiply it by average the (14+16)/2 = 15 to find the required amount of welding rods.
We cannot forget required steel treatment like hot bath galvanizing and steel painting when we estimate the cost of the steel structure. The painting cost also to be included in the BoQ. Since we have estimated the length of steel irons with its sizes, we will be able to calculate the total area of the steel structure. Then what we have to do is to find the painting products base on the description given by the engineer and manufacturers details that how much of an area can be painted by one liter or gallon. so we can find the required amount of paint liters or gallons.
Once we are done with the Material calculations, we have to figure out the Labour, Plant & Equipment and also transportation cost for the above structure. Then we have to add the overheads & profit to take the final figure.
In the next article, I hope to publish cost estimation for steel structure with supporting drawings so you readers can easily understand how it is done.
Note: Unit weight can be different even for the same size of iron where thickness is not the same. Therefore, the price will be changed for each steel since the price of steel base on its weight.
Then we should have a proper idea what are the required amount of steel plates with its thickness, nuts & bolts, washers, welding rods, etc. Most of the time you will be given drawings of each section so you can calculate the required material quantities easily and quickly.
When estimating required amount of welding rods it is necessary to know the total weight of steel structure. In fact in steel structure it is approximately we use 14-16 Kg of welding rods per one ton. Therefore by estimating steel structure weight, we can multiply it by average the (14+16)/2 = 15 to find the required amount of welding rods.
We cannot forget required steel treatment like hot bath galvanizing and steel painting when we estimate the cost of the steel structure. The painting cost also to be included in the BoQ. Since we have estimated the length of steel irons with its sizes, we will be able to calculate the total area of the steel structure. Then what we have to do is to find the painting products base on the description given by the engineer and manufacturers details that how much of an area can be painted by one liter or gallon. so we can find the required amount of paint liters or gallons.
Once we are done with the Material calculations, we have to figure out the Labour, Plant & Equipment and also transportation cost for the above structure. Then we have to add the overheads & profit to take the final figure.
In the next article, I hope to publish cost estimation for steel structure with supporting drawings so you readers can easily understand how it is done.
Excellent blog posted here. One can also get the details of steel fiber for precast only at Precision Drawell. Thanks for sharing.
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