rebar detailing for footings
When it comes to rebar detailing, footings are the first drawing created for construction. Concrete footings are responsible for supporting column and wall loads. During construction, contractors excavate for footings first. There are 3 types of footings that are synonymous with rebar detailing. For example, the first footing commonly used in construction is the wall footing. Wall footings are concrete elements responsible for supporting wall loads. In addition, these wall footings transfer the load from the wall into the footing.
Isolated footings are the second type of footing that all rebar detailing services provide on their drawings. Like wall footings, isolated footings transfer loads to competent soil and rock below grade. The main difference between a wall footing and an isolated footing is the type of load they carry. For example, isolated footings carry column loads. They also differ in size and shape when compared to wall footing dimensions. Most isolated footings are rectangular or square and shape, whereas most wall footings are rectangular in shape.
Another type of footing found on rebar detailing drawings are combined footings. Combined footings are normally rectangular in shape. This is because two columns share a single footing. For example, when two columns are within close proximity of each other, its practical to install a single footing to carry both loads. Another example where you can use a combined footing is along a property line. This design case is encountered when an exterior footing extends beyond the property line. The solution for this conditions is creating a shared footing between the interior and exterior columns. When providing rebar detailing for footings, it’s important to understand rebar size, rebar spacing, and quantity of bars.
detailing walls
The second most important drawing in the rebar detailing world is wall details. Walls are essential for the structural integrity of a concrete building. In addition walls are responsible for load transfer from beams and roof loads. There are two types of walls in construction. The first wall is the exterior perimeter walls of a building. These walls are responsible for carry a large portion of the building loads. Although, exterior walls carry majority of the building load, interior walls are equally important. Inner walls are also design to carry loads. A particular interior wall called a shear wall is responsible for transferring horizontal load imposed by lateral forces.
Walls can also be defined as load bearing and non-load bearing. Load bearing walls are responsible for supporting vertical and horizontal loads of a building. Whereas, non-load bearing walls don’t carry any load except for its own weight. The purpose of non bearing walls is to create inner space within a building. Moreover, when providing rebar detailing services for walls, it’s important to understand certain design terms. Those terms are rebar size, rebar quantity, and rebar spacing. Some additional terms to understand are vertical and horizontal reinforcement.
detailing for slabs
The last drawing that is critical for rebar detailing is slab details. Slabs are responsible for carrying surface loads which include live and dead loads. They also provide lateral stability for buildings by transmuting horizontal loads to shear walls. Furthermore, there are two types of slabs in concrete construction. The first type of slab is called a slab on grade. Slab on grade construction is a slab bearing directly on rock or soil. These type of slabs can range from 6 to 12 inches in thickness.
Structural slabs are the second type of slabs in concrete construction. In addition, structural slabs range in thickness. Slabs can range from 24 to 60 inches in thickness. Normally, mat slab cover thickness greater than 36 inches. They are supported by piles and grade beams but they can also bear directly on rock or soil. Furthermore, rebar detailing for concrete slabs are equally important as footings and walls. Detailers should be familiar with bottom and top reinforcement terms. It is also important to understand that slabs can be reinforced with wire mesh. However, wire mesh is normally for slab on grades.
In conclusion, rebar detailing includes other type of drawings not previously mentioned. These drawings include, grade beams, pile caps, columns, and elevator pits. To become a successful detailer, one must understand the many type of rebar drawings synonymous with concrete construction.
