A simple question that has a slightly more complicated answer. A bar bending schedule, or BBS as it is sometimes referred, is a comprehensive document that describes the type, size, mark, location, length, number and bending details for all rebar required for a build. In other words, it allows for proper management of materials, limits off-cut waste, and ensures that it will be placed correctly.
Who Needs the Bar Bending Schedule at Construction Sites?
If you already work in construction, you likely know the purpose of a bar bending schedule and who is going to be using it. However, for those that are new to construction, I thought it would be a good idea to simply go through all aspects and keep it basic at first. Here is a list of individuals involved in a build who typically needs to use a bar bending schedule:
Steel detailer
Often referred to as just a Detailer, these are the people in charge of preparing detailed plans, drawings and other such documents for the manufacturing and implementing of steel elements in the build.
The contractor
The contractor will generally be responsible for the planning and execution of the building project including inspection and day-to-day supervision of workers and the site.
Rebar manufacturer
This will be the company you have chosen for the manufacturing of the reinforcing steel needed for your build. RSC offers total reinforcing solutions including the supply, cut, bend, and wiring into position of steel reinforcing. Be sure to have a look at our Services page for more details.
Steel fixer
The people working as steel fixers will be responsible for assembling and positioning the steel bars and mesh to form the reinforcement for the structure. This is all done prior to pouring the concrete.
Site clerk
Serving a very important role, the site clerk functions as day-to-day on-site management in terms of site documentation, deliveries, and site enquiries.
The quantity surveyor
The quantity surveyor is broadly responsible for feasibility studies for the project, budget, prepare tender and contract documentation, and other related procurement strategies.
What does a Bar Bending Schedule Usually Include?
The bar bending schedule needs to include a range of information concerning the steel reinforcement being used in the build. You will find all the particulars pertaining to the rebar size needed and the shapes required. Minimising off-cut waste. This is something that must be done with accuracy as the reinforcing steel provides tensile strength to the structure. Typically, a concrete structure lacks greatly in tensile strength. So, for safety and economic reasons, it is best to have a bar bending schedule in place. Below is a list of information most often included in a bar bending schedule:
• Bar number/Bar Mark Reference
• Bar shape
• Diameter
• Spacing
• Length of bar
• Cutting Length
• Number of bars
What are the Most Common Shapes?
There are a few shapes that are more commonly used than others due to ma aspects of residential or commercial builds overlap. Every project has a foundation, right? The less common shapes are used when there is a construction project outside of the norm and needs a little creativity to get the job done. Here is a list of the most common shapes and where they are generally used:
• Shape code 20 – Your essential “straight” bar used in floors, columns, beams, and slabs.
• Shape code 37 – A standard bend used in column footings and edges.
• Shape code 38 – Commonly known as a “u-bar” for the distinct shape and used in isolated footings, slabs, and very short beams.
• Shape code 39 – A straight bar that hooks at one end similarly to an umbrella handle and used in beams and slabs.
• Shape code 41 – Sometimes referred to as a “kink bar” as it helps lap bars and structural elements.
• Shape code 60 – Also known as “links” is usually mild steel that helps to hold bars in place. Used in beams and columns.
• Shape code 72 – Being able to hold more layers this shape is often used as a link or stirrup, particularly in beams.
• Shape code 83 – This shape is used in foundations, beams, and slabs.
• Shape code 86 – This is the spiral shape used in circular columns.
