Bar bending process

Bar Bending

Steel bars should cut and bend to the required shape at the bar bending plant located in site. Initially the required bar schedule prepared according to the reinforcement drawings by the structural Engineers is been provided. The bar-benders then they were provided bars with necessary size and will be bent according to the required shape and length.  Then they will be placed as in the drawings.

 Show the process of Bar bending by a bar bender according to the requirements as in the drawings.

Bar bending 

Bar bending

What is reinforcement in construction

Reinforced concrete is one of the most widely used modern building materials. Concrete is an “artificial stone” obtained by mixing cement, sand, and aggregates with water. Fresh concrete can be moulded into almost any shape, giving it an inherent advantage over other materials.

Steel reinforcement is available in the form of plain steel bars, deformed steel bars, cold-drawn wire, welded wire fabric, and deformed welded wire fabric. In Sri Lanka Reinforcing steel must conform to applicable British/ European standard specifications.

The reinforcement in concrete may be simple bar or series of bars, bend to a given schedule which known as bar schedule and tied according to the reinforcement drawings with stirrups.  The normal diameters of bars used at this site are 6, 10,12,13,16, 25 and 32 millimetres.

1. Bar Bending 
2. Bar Notation 
3. Lapping of steel bars
4. Crank Length 
5. Covering 
6. Stool in reinforcement 

Lapping length of reinforcement steel bars

Lapping of Steel Bars

Normally, steel bars have a 6m length. If length of a bar is not enough to keep the reinforcement, we have to lap two steel bars. Normally, lapping position is at where near the minimum shear force is acting. Normally lap length is 50D meaning 50 times the bar diameter if both bars are of same diameter. When lapping two bars of different diameters, the lap length is considered as 50 times the smaller diameter.

50D

Lap length = 50 X Diameter