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What is Bar Bending Schedule (BBS)?
Bar bending schedule is a list of reinforcement bars in a tabular form giving the particulars of bars, the shape of bending with sketches, length of each, total length, and total weight.
Usually, for each type of RCC work, a schedule of bars is prepared. With the help of BBS, the requirements of different sizes and lengths of bars may be known and may be arranged and bent up during the time of construction. It gives information about
• Particular size and type of bars
• The shape of bending with a sketch if any
• Number of sets or numbers of bars of each set
• Length of each and total length in running meter
• Weight per unit length and total weight.
Importance of Bar Bending Schedule
As we know, the cutting and bending of steel bars are done by labour at the site. The labours working on site are not so technically sound, so it is difficult to explain them with the help of drawing.
There are chances of wrong cutting and bending of steel. With the help of BBS, it is very easy to explain to them because in BBS shape and cutting length of bars are given.
A supervisor can easily guide the labours and the required work can be done by them as per structural design requirements and specifications.
Advantages of Bar Bending Schedule
1 There is faster execution of work at the site with the help of BBS, which reduces construction costs and time.
2 BBS reduces reinforcement wastages in cutting.
3 BBS helps in improving quality control at the site.
4 It helps in stock management at the site.
5 It helps in auditing reinforcement and provides a check on theft.
6 It helps in the fast preparation of bills for construction works.
7 It helps in the estimation of steel quantity.
Uses of BBS
• It helps to determine the total quantity of steel needed for the construction of a structure. Also, It helps to quote the cost acquired by steel for tender.
• BBS helps to determine the cutting length, and bending length of reinforcement, which helps to improve construction quality and minimize steel wastage making construction economical.
• BBS allows cutting and bending of reinforcement at the factory and transported to the site. It allows for faster construction and reduces construction costs.
• For site engineers, It becomes clear to verify the cutting length and bending length of the reinforcement before placing the concrete.