1. The base elevation of the scaffolding bottom should be 50-100mm higher than the natural floor
2. Single-row scaffolding – a scaffolding with only one row of vertical poles and one end of the short horizontal pole resting on the wall.
Double-row scaffolding – a scaffolding consisting of two rows of vertical poles and vertical and horizontal horizontal poles.
Double-row scaffolding is generally used for masonry projects. Masonry requires load-bearing: throwing cement, bricks, etc.
Single-row scaffolding is generally used for projects that do not require load-bearing, such as interior wall plastering and painting.
Single-row scaffolding requires the support pole to be supported against the wall.
The horizontal bars of the single-row scaffolding should not be set in the following locations:
① Where the design does not allow for scaffolding eyes;
② Within the 60° triangle on the lintel and the two ends of the lintel and within the height range of 1/2 of the clear span of the lintel;
③ Window walls with a width of less than 1m; 120mm thick walls, stone walls and independent columns;
④ Under the beam or beam pad and within 500mm on the left and right;
⑤ Within 200mm on both sides of the brick masonry door and window openings (300mm for stone masonry) and 450mm at the corners (600mm for stone masonry);
⑥ Independent or attached brick columns, hollow brick walls, aerated block walls and other lightweight walls;
⑦ Brick walls with masonry mortar strength grade less than or equal to M2.5.
3. The scaffolding must be erected in accordance with the construction progress, and the erection height should not exceed two steps above the adjacent wall ties. (Analysis: The scaffolding can be erected up to 2 steps without wall ties, or it can be erected up to 2 steps above the wall ties without wall ties. The number of steps is the horizontal crossbar spacing)
4. The longitudinal horizontal bar (which can be understood as a large cross bar) should be set on the inside of the vertical bar, and its length should not be less than 3 spans.
5. The joints of two adjacent longitudinal horizontal rods should not be set in sync. The horizontal offset distance between two adjacent asynchronous joints should not be less than 500mm. The distance from the center of each joint to the nearest main node should not be greater than 1/3 of the longitudinal distance.
6. The joints of two adjacent longitudinal horizontal bars should not be set in the same span. The horizontal distance between two adjacent joints in different spans should not be less than 500mm, and the distance from the center of each joint to the nearest main node should not be greater than 1/3 of the longitudinal distance.
7. The overlapping length of the longitudinal horizontal rod should not be less than 1m, and three rotating fasteners should be set at equal intervals for fixing. The distance from the edge of the end fastener cover plate to the end of the overlapping longitudinal horizontal rod should not be less than 100mm.
8. A horizontal bar (small cross bar) must be installed at the main node, fastened with right-angle fasteners and it is strictly prohibited to remove it.
9. The center distance between the two right-angle fasteners at the main node should not be greater than 150mm.
10. In a double-row scaffolding, the overhanging length from one end of the wall should not be greater than 0.4 times the center length of the two nodes, and should not be greater than 500mm.
11. The maximum spacing of horizontal bars at non-main nodes on the working layer should not be greater than 1/2 of the longitudinal distance.
12. Stamped steel scaffolding boards, wooden scaffolding boards, bamboo scaffolding boards, etc. should be set on three horizontal horizontal bars. When the length of the scaffolding board is less than 2m, two horizontal horizontal bars can be used for support, but the two ends of the scaffolding board should be securely fixed to it to prevent tipping.
13. When the scaffolding boards are laid flat, two horizontal bars must be installed at the joints. The outward extension of the scaffolding boards should be 130-150mm, and the sum of the outward extension lengths of the two scaffolding boards should not be greater than 300mm. When the scaffolding boards are overlapped and laid, the joints must be supported on the horizontal bars. The overlap length should not be less than 200mm, and the length extending out of the horizontal bars should not be less than 100mm.
14. The longitudinal sweeping rod should be fixed to the vertical rod at a distance of no more than 200mm from the top of the base by right-angle fasteners. The transverse sweeping rod should be fixed to the vertical rod just below the longitudinal sweeping rod by right-angle fasteners.
15. When the foundations of the poles are not at the same height, the longitudinal sweeping poles at the higher position must be extended to the lower position. The two spans are fixed to the poles, and the height difference should not be greater than 1m. The distance from the pole axis above the slope to the slope should not be less than 500mm.
16. For the extension of the vertical poles, except for the top step of the top floor, the joints of the other layers and steps must be connected with butt fasteners. The butt fasteners on the vertical poles should be staggered, and the joints of two adjacent vertical poles should not be set in the same sync. The distance between the two adjacent joints of every other vertical pole in the same sync in the height direction should not be less than 500mm; the distance from the center of each joint to the main node should not be greater than 1/3 of the step distance. The overlap length should not be less than 1m, and it should be fixed with no less than 2 rotating fasteners. The distance from the edge of the end fastener cover to the pole end should not be less than 100mm.
17. Wall ties must be installed at both ends of the open scaffolding. The vertical spacing of the wall ties should not be greater than the building’s floor height and should not be greater than 4m. (Scaffolding installed along the non-intersecting circle around the building is an open scaffolding. The peripheral scaffolding of general buildings is continuously arranged along the building’s circumference to form a closed whole. For example, the scaffolding on the gable is not only tied to the main structure, but also connected to the front and back scaffolding at both ends.)
18. Both ends of the open double-row scaffolding must be equipped with horizontal diagonal braces.
19. Single-row and double-row scaffolding with a height of less than 24m must be equipped with a scissors brace at both ends of the outside, at the corners and on the vertical surface not exceeding 15m in the middle, and the scissors brace should be installed continuously from bottom to top.
20. Double-row scaffolding with a height of 24m and above shall be equipped with continuous scissor braces on the entire outer facade.
21. When the scaffolding is just being erected, since the wall ties have not yet been installed, in order to ensure the stability of the scaffolding, a guy should be installed every few spans (usually 6 spans), that is, use an inclined steel pipe, one end of which is connected to the vertical pole with a rotating fastener, and the other end is diagonally supported on the ground to play a supporting role. It can only be removed according to the situation after the wall ties are installed stably.
22. Dismantling of scaffolding:
1) Dismantle from top to bottom layer by layer.
2) Dismantle the wall ties layer by layer and in sections. The height difference should not be greater than 2 steps. If it is greater than 2 steps, additional wall ties should be installed.
3) Throwing to the ground is strictly prohibited.
23. Scaffolding inspection and acceptance:
1) Before foundation completion and frame erection.
2) After each erection of 6-8m in height.
3) Before load is applied to the working layer.
4) After strong winds of level 6 or above, heavy rain, and freeze-thaw.
5) After reaching the designed height.
6) After being out of service for more than 1 month.
24. Regular inspection of scaffolding:
1) Whether the setting and connection of rods, wall connecting parts, supports, and door opening trusses meet the requirements;
2) Whether there is water accumulation in the foundation, whether the base is loose, whether the vertical poles are suspended, and whether the fastener bolts are loose;
3) Whether the double-row and full-height frames above 24m, and the full-height support frames above 20m in height, the settlement and verticality of the vertical poles meet the requirements;
4) Whether the safety protection measures are in place;
5) Whether there is overloading.
