First, Calculation Rules for Industrial Scaffolding
(1) When calculating interior and exterior wall scaffolding, the area occupied by door and window openings, open loop openings, etc., is not deducted.
(2) If the height of a building varies, separate calculations should be made for each height.
(3) The scope of work contracted by the general contractor does not include exterior wall decoration or exterior wall decoration. For projects that cannot be constructed using main construction scaffolding, either main external scaffolding or decorative external scaffolding may be applied separately.
Second, Calculation Rules for External Scaffolding
(1) The height of a building’s exterior wall scaffolding is measured from the designed outdoor floor to the eaves (or parapet top). The project is calculated in square meters based on the length of the exterior wall’s outer edge (for buttresses protruding from the wall with a width greater than 240mm, the dimensions shown in the diagram should be expanded and included in the exterior wall length), multiplied by the height.
(2) Masonry heights below 15m are calculated using a single-row scaffolding system. Buildings above 15m, or less than 15m, where the exterior wall doors, windows, and decorative areas exceed 60% of the exterior wall surface area (or where the exterior walls are cast-in-place concrete or lightweight block walls), are calculated using a double-row scaffolding system. Buildings exceeding 30m in height may be calculated using a double-row scaffolding system with a steel cantilever platform, depending on the project details.
(3) Independent columns (cast-in-place concrete frame columns) are calculated based on the outer perimeter of the column structure shown in the diagram, plus 3.6m, multiplied by the designed column height in square meters, and the single-row external scaffolding system applies. Cast-in-place concrete beams and walls are calculated based on the height from the designed outdoor floor or floor slab top to the floor slab bottom, multiplied by the net length of the beam or wall in square meters, and the double-row external scaffolding system applies.
(4) Steel cantilever pipe frames are calculated based on the outer wall length multiplied by the designed height in square meters. The platform overhang width quota has been comprehensively determined and will be applied according to the specific height of the quota item.
Third, Calculation Rules for Internal Scaffolding
(1) For internal wall scaffolding of a building, when the height from the designed interior floor to the lower surface of the ceiling (or 1/2 the height of the gable wall) is less than 3.6m (non-lightweight block wall), it shall be calculated as a single row of internal scaffolding; when the height exceeds 3.6m but is less than 6m, it shall be calculated as a double row of internal scaffolding.
(2) Internal scaffolding shall be calculated based on the vertical projection area of the wall surface, and the internal scaffolding project shall be applied. Lightweight block walls, such as those that cannot have scaffolding holes in the internal walls, shall be calculated using the double row of internal scaffolding project.
Fourth, Calculation Rules for Decorative Scaffolding
(1) When the original masonry scaffolding cannot be used for interior wall decoration exceeding 3.6m in height, the decorative scaffolding may be calculated according to the internal scaffolding calculation rules. The decorative scaffolding shall be calculated as a double row of internal scaffolding multiplied by a coefficient of 0.3. (2) When the interior ceiling decoration surface is more than 3.6m from the designed interior floor, full-height scaffolding can be calculated. Full-height scaffolding is calculated based on the net interior area. When the height is between 3.61 and 5.2m, the basic layer is calculated. When the height exceeds 5.2m, each additional 1.2m is counted as an additional layer; any height less than 0.6m is not counted. Additional layers are calculated as follows: Full-height scaffolding additional layers = [net interior height - 5.2m] / 1.2m.
(3) When exterior wall decoration cannot be constructed using the main scaffolding, exterior wall decoration scaffolding can be calculated. Exterior wall decoration scaffolding is calculated based on the designed exterior wall decoration area, and the corresponding quota items are applied. Exterior wall painting and plastering scaffolding are not calculated.
(4) After the full-height scaffolding is calculated as required, scaffolding is no longer calculated for interior wall decoration projects.
Fifth, Calculation Rules for Other Scaffolding
(1) For fence scaffolding, the calculation is based on the masonry height from the outdoor natural floor to the top of the fence, multiplied by the length in square meters. The corresponding items for single-row inner scaffolding apply to fence scaffolding.
(2) For stone masonry walls, where the masonry height is 1.0 mm or higher, the calculation is based on the designed masonry height multiplied by the length in square meters, and the double-row inner scaffolding items apply.
(3) For horizontal protective frames, the calculation is based on the horizontal projection area of the actual planking in square meters.
(4) For vertical protective frames, the calculation is based on the height from the natural floor to the topmost horizontal bar multiplied by the actual length in square meters.
(5) For cantilever scaffolding, the calculation is based on the length and number of layers in extended meters.
(6) For suspended scaffolding, the calculation is based on the horizontal projection area in square meters.
(7) For chimney scaffolding, the calculation is based on the number of units, depending on the height. Concrete chimneys and silos constructed using sliding formwork are not included in the scaffolding calculation.
(8) Elevator shaft scaffolding is calculated as a single-hole unit.
(9) Inclined ramps are calculated as units of varying heights.
(10) Storage silo scaffolding, regardless of whether it is a single-tube or a group of silos, is calculated in square meters based on the outer perimeter of the single tube multiplied by the height from the designed outdoor floor to the top of the silo. Double-row external scaffolding is used.
(11) Water (oil) tank scaffolding is calculated in square meters based on the outer wall perimeter multiplied by the height from the outdoor floor to the top of the tank wall. Water (oil) tanks exceeding 1.2 meters above the floor are calculated in square meters based on double-row external scaffolding.
(12) Equipment foundation scaffolding is calculated in square meters based on the outer perimeter multiplied by the height from the floor to the outer top edge. Double-row internal scaffolding is used.
(13) Vertical enclosure work for buildings is calculated based on the vertical projection area of the enclosure surface.
(14) Vertical hanging safety nets are calculated by multiplying the actual length of the frame by the actual height in square meters.
(15) Cantilevered safety nets are calculated by the horizontal projection area of the cantilevered portion.
Post time: Oct-24-2025