Bar Bending Schedule

This is a list of reinforcement bars in a tabular form and the following essential details are generally given for a bar bending schedule in R.C.C. works.

·        Bar marks – this gives the position of the bar in the structure

·        Diameter of bar

·        The shape and bending dimensions of the bar

·        Length of each bar

·        Number of the same type of bars

·        Total length

·        Weight

·        Total weight

Most designers have their own form of bending schedule to suit the work in hand. According to the recommendations of IS 2502-1963 standard form of reinforcement schedule has been shown below.

Schedule Number


Location
Mark Designation
Size and type
Number of sets
Number per set
Total Number
Length
Shape (all dimensions are in accordance with the standard)
1
2
3
4
5
6
7
8

Width of column (1) to (8) are 25, 20, 15, 15, 15, 15, 15 and 75 mm respectively.

From the bar bending schedule the requirement of different sizes of bars can be known and bars may be cut and bend accurately at work site. This also helps to avoid confusion and facilitates checking and estimates can be prepared more quickly. The dimensions of bends should be so given that a minimum amount of calculations is necessary for making of bars and setting the machine and stops. No calculations should be given bar bending schedule. In working drawings for R.C.C. structures bar bending schedules are provided.

Estimating steel for reinforcement

For reinforced concrete works estimate of steel may be necessary mainly for the following purposes.

·        For procurement of the material

·        To submit or to check at site the consumption of the material

·        For preparation of bill for payment

·  For quantity of steel may be calculated from the bar-bending schedule which is normally provided in the detailed drawings for R.C.C. works.

In absence of bar bending schedule the quantity of steel may be estimated providing a take off sheet having the following columns.


Size of bar and position
Overall length with cover
Extra length for
Less cover
Actual length
2+3-4
No. of bars
Total length
weight










·   For to prepare bill of quantity of steel of payment, measurement are entered in the measured book.