BBS, bbs for raft, Bar Bending Schedule for Hexagonal Raft/Pile Cap, How to Prepare Bbs for pile cap

Dear Friends,
Good Evening,
This video is created to easily understand Bar bending schedule or schedule of bars (BBS) is a list of reinforcement bars for a given reinforced concrete work item, and is presented in a tabular form for easy visual reference. Table of bar bending schedule summarizes all the needed particulars of bars - diameter, shape of bending, length of each bent and straight portions, angles of bending, total length of each bar, and number of each type of bar. This information is a great help in preparing an estimate of quantities.
Importance of Preparing Bar Bending Schedule
The main importance of preparing the bar bending schedule can be listed as follows:
a. It is essential for determining the quantities of materials particularly steel.
b. It enlists all the details of the rebars beforehand thereby the wastage is eliminated.
c. It is essential for the calculation of the cutting length of various types of rebars.
d. It assists the workmen and laborers in completing the reinforced concrete works efficiently.
e. It helps to prepare the bills that can be claimed to the clients. Preparation of Bar Bending Schedule The necessary column for the bar bending schedule can be listed as follows:
a. The shape of Bars
b. The diameter of Bars
c. Bar Number or the Bar Reference
d. Spacing
e. Length of Bars
f. Cutting Length
g. Number of Bars
The detailed reinforcement drawing provides various information required for the bar bending schedule. Such information includes the shape of bars, length of bars, the diameter of bar and spacing of bars.
The formula for calculating the various parameters are as follows:
Cutting Length = True Length of Bar – Deductions
Steps Involved In The Preparation Of Bar Bending Schedule
a. Each bar is first labeled using an appropriate reference mark. Concerning the structural drawing, the shapes of all the bars are recorded. Then, a table is prepared and the diameter of each bar is labelled in the table.
b. Then, the number of bars is calculated using the above-listed formula.
c. The length of the reinforcement bars is then measured.
d. Then, the unit weight of the reinforcement bar is computed as, Unit Weight of Bar = Volume of Bar * Density of Bar
1. Bar Length Deduction as per Indian Code IS 2502  Deducts Bar Length with K Factor as per IS Code
2. Bar Length Deduction as per British Code BS 8666  Deducts Bar Length with r Factor as per BS Code
3. Bar Length Deduction as per Site Practices  Deducts Bar Length One Dia. For each 90 Deg. Bend.
4. Without any Deductions in Bar Length.
This video is free of cost and may be very useful for a fresher students who is pursuing in civil engineering courses and just joined as a trainee. In this video these are the content to understand…
1. Read the drawing carefully.
2. Prepare the BBS.
3. Marking on the reinforcement as required.
4. Cut the bar.
5. Bend the bar and collect it on suitable place.

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