A bar bending schedule is actually a table to calculate the quantity of steel used in different structures, either on the building side, roads dams, bridges barrages, or any other civil construction where we use steel.
The Schedule is actually prepared by the QS, also known as the estimator and we will know about the actual quantity of steel used in the project.
Basics of Bar Bending Schedule
Bar Bending Schedule (BBS) is a detailed document that lists the reinforcement steel bars needed for a construction project. It includes information like the shape, size, and quantity of each bar. BBS is created based on structural drawings, and it helps ensure accurate estimation, improves productivity, and enhances quality control. A bar bending machine is commonly used for fabrication based on the BBS.
Preparation of Bar Bending Schedule
The preparation of a Bar Bending Schedule (BBS) involves the following steps.
Identify structural elements.
Determine the different structural elements that require reinforcement, such as columns, beams, slabs, and footings.
Marking.
Mark the individual bars on the structural drawings, indicating their shape, size, and length. This helps in identifying and tracking each bar.
Calculation.
Calculate the quantity of steel required for each marked bar. Consider factors like lap lengths, overlaps, and wastage to determine the exact quantity needed.
Tabulation.
Compile all the information into a tabular format, organizing the bars according to their size, shape, and location in the structure. The tabulation includes details like bar numbers, diameter, length, shape code, and bending details.
Bar bending details.
Specify the bending angles, dimensions, and locations of bends for each bar. This information helps fabricators accurately bend the bars according to the required specifications.
Summary.
Provide a summary of the total quantity and types of reinforcement required for the entire project. This summary helps in estimating material requirements and managing procurement.
It is important to note that the specific process and level of detail for preparing a BBS may vary depending on the project requirements, design complexity, and the standards followed by the construction industry.
Table And Formulas used in Bar Bending Schedule.
The table of BBS that we make to calculate quantities is as under.
| S NO | DESCRIPTION | NO OF MEMBERS | NO OF BARS | TOTAL BARS | CUT LENGTH | TOTAL LENGTH | UNIT WEIGHT | TOTAL WEIGHT | REMARKS |
| 1 | |||||||||
| 2 | |||||||||
| 3 | |||||||||
| 4 |
Conclusion
The Bar Bending Schedule (BBS) is a document that lists the reinforcement steel bars required for a construction project. It helps estimate the quantity of steel, guides the fabrication and placement of bars, and ensures the quality and durability of the structure.