The main function of the reinforcement cage is the same as that of the longitudinal reinforcement of the column. It mainly plays a tensile role. The compressive strength of the concrete is high, but the tensile strength is very low.

It can restrain the concrete of pile body and make it bear certain axial tension.

During the construction of bridges and culverts or high-rise buildings, piling may be required for the foundation according to the requirements, by using machine punching and water mill drilling,

And the hole depth meets the design requirements, then place the reinforcement cage into the pile hole, and then insert the conduit for concrete pouring.

In addition, when the concrete structure is a column or strip member, the central part does not need reinforcement,

Reinforcement shall be provided only under the surface of concrete members in contact with air.

If the component is vertical, we will make the reinforcement around the component in advance, which is the reinforcement cage.

Usually, we call the pre fabricated reinforcement structures such as bored pile, dug pile and column as reinforcement cage.

What is the diameter of the reinforcement cage?

Outer diameter of cast-in-place pile reinforcement cage = pile shaft diameter － 100;

Calculated diameter during stirrup calculation = pile shaft diameter - 100 - stirrup diameter;

Outer diameter of inner stiffening ring = pile shaft diameter - 100 - stirrup diameter × 2 - longitudinal bar diameter × 2；

Diameter during calculation of internal reinforcing ring = pile shaft diameter － 100 － stirrup diameter × 2 - longitudinal bar diameter × 2 - diameter of reinforcing ring reinforcement.