Unless otherwise specified, the quantity of formwork for cast-in-place concrete and reinforced concrete shall be calculated in square meters (㎡) based on the area of the contact surface between the concrete and the formwork.
The formwork height for cast-in-place reinforced concrete columns, beams, slabs, and walls (i.e., the height from the outdoor ground level to the bottom of the slab or from the top of the slab to the bottom of the slab) shall be within 3.6m. For any portion exceeding 3.6m, an additional support quantity shall be calculated based on the excess portion.
Holes in cast-in-place reinforced concrete walls and slabs with a single opening area of 0.3㎡ or less shall not be deducted, and the formwork area of the opening sidewalls shall not be increased. Holes with a single opening area exceeding 0.3㎡ shall be deducted, and the formwork area of the opening sidewalls shall be included in the calculation of the wall and slab formwork quantity.
Cast-in-place reinforced concrete frames shall be calculated according to the relevant regulations for beams, slabs, columns, and walls respectively. Attached columns shall be included in the calculation of the wall quantity.
For cup-shaped foundations where the height of the cup opening is greater than the length of the larger side of the cup opening, the high-cup foundation quota item shall be applied.
Overlapping portions of connections between columns and beams, columns and walls, and beams, as well as beam ends and slab ends extending into walls, are not included in the formwork area calculation.
Exposed surfaces of structural columns should be included in the formwork area calculation. The contact surface between structural columns and walls is not included in the formwork area calculation.
Cast-in-place reinforced concrete cantilever slabs (awnings, balconies) are calculated based on the horizontal projected area of the cantilever portion. The formwork for corbel beams and slab edges extending outside the wall is not calculated separately.
Cast-in-place reinforced concrete stairs are calculated based on the horizontal projected area of the exposed surface, without deducting the area occupied by stairwells smaller than 500mm. The side formwork for stair treads, stair treads, platform beams, etc., is not calculated separately.
Concrete steps, excluding the stair straps, are calculated based on the horizontal area of the step dimensions. The formwork area on both sides of the step ends is not calculated separately.
Cast-in-place small concrete pools and tanks are calculated based on the external volume of the component. The formwork for the inside, outside, and bottom of the pool or tank is not calculated separately.
