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Bar bending is a crucial process in construction, particularly when working with reinforced concrete members. Reinforcing bars, or rebars, are bent into various shapes to enhance the tensile and compressive strength of concrete structures. Here, we'll explore the need for rebars, when to bend them, precautions to take, and how to make a bar bender at home.

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What Is Bar Bending

Need of Rebars:Reinforcing bars are essential for increasing the tensile and compressive strength of concrete. They are particularly crucial in areas of a structure subjected to tension. For example, in beams, where the bottom part tends to stretch or lengthen under the dead load, reinforcing bars prevent the beam from breaking.

When We Bend Rebars:The bending of rebars is essential for various reasons. In continuous beams, the bending is designed to accommodate the complex stresses that occur due to the structure's shape and load distribution. Engineers strategically bend reinforcing steel to align with tensile stresses, ensuring effective reinforcement.

Precautions When Bending Rebars:Rebars should not be bent too sharply, as this can lead to cracking or weakening. Minimum bend diameters have been established for different bar sizes and hook types to prevent such issues.

How To Make A Bar Bender

What You Need:To make a bar bender at home, you'll need the following tools and materials:

• Tools: Angle grinder, cutting disk, grinding disk, hacksaw, drill or drill press, welding machine, tape measure, vernier, center punch, pen scriber, clamps or vice grips, drill bits, taps set, countersink, wrench.
• Materials: Tube, round stock steel (bushing, roller die), rod (rotating pivot), flat bar (bending unit), flat bar 30x3x100mm (additional), square tube 20x20x1.5mm or heavier (handle), bolts, nuts, washers.

Preparing the Pivot Set:

1. Cut a 32mm piece of steel and smooth the profiles.
2. Punch a center punch where the hole will be in the tube and drill it gradually from 4mm to 16mm.
3. Enlarge the bushing hole from 14mm to 16mm using a countersink.
4. Polish the 16mm rod/axle using a drill press and Scotch Brite.
5. Cut a 70mm piece for the pivot of the bushing.

Bending Part:

1. Weld bushings and drill a 10mm hole at the base.
2. Cut threads using an M12 set tap.
3. Place the roller die in the hole and assemble with washers and a bolt.
4. Ensure the roller can rotate freely.

The Base for Pivot:

1. Make a small pivot base with an M16 nut, a 16mm drill bit, and an M6 headless socket bolt.
2. Cut threads with an M6 set tap after drilling a 5mm hole.
3. Insert the pivot into the nut and adjust, then weld the nut to the main unit.

Conclusions

In conclusion, bar bending is a fundamental aspect of construction projects, essential for creating stirrups and longitudinal reinforcement. With basic tools and materials, you can make your own bar bender at home, facilitating the construction process.