What does a bolsters and chairs specifically support in construction?

Bolsters and chairs are specifically used in construction to support reinforcing steel bars, commonly referred to as rebar. These components are crucial in the proper installation of rebar within concrete slabs, as they ensure that the bars are positioned correctly within the concrete to achieve the desired structural integrity.

When concrete is poured, it needs to encapsulate the rebar properly. Bolsters provide height and spacing, often allowing the rebar to be elevated above the ground to prevent it from resting on dirt or debris. Chairs serve a similar purpose, assisting in maintaining the alignment and positioning of the rebar throughout the concrete pouring process. This support is essential because proper placement of the rebar helps in the distribution of loads and enhances the overall strength and durability of the concrete structure once it has cured.

While concrete slabs, steel beams, and framework are parts of construction, they are not what bolsters and chairs specifically support; their role is focused on ensuring the stability and positioning of the reinforcing steel bars within concrete applications.