1. The base elevation of the bottom surface of the scaffolding 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 triangle range of 60° between the ends of the lintel and 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 plain 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 by the construction progress, and the erection height at one time should not exceed two steps above the adjacent wall connection. (Analysis: The maximum height of the scaffolding without wall ties is 2 steps, or it is allowed to build a frame with a height of up to 2 steps without wall ties on the wall ties. The number of steps is the horizontal large crossbar spacing)
4. The longitudinal horizontal bar (which can be understood as the large crossbar) should be set inside the vertical bar, and its length should not be less than 3 spans.
5. The joints of two adjacent longitudinal horizontal bars should not be set in synchronization, the horizontal offset distance of two adjacent joints that are not synchronized 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.
6. The joints of two adjacent longitudinal horizontal bars should not be set in the same span, the horizontal offset distance of 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 lap length of the longitudinal horizontal bar should not be less than 1m, and 3 rotating fasteners should be set at equal intervals to fix it. The distance from the edge of the end fastener cover plate to the end of the lapped longitudinal horizontal bar should not be less than 100mm.
8. A transverse horizontal bar (small crossbar) must be set at the main node, fastened with a right-angle fastener, and strictly prohibited from being removed.
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 scaffold, the extension 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 the transverse 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 string scaffolding boards, etc. should be set on three transverse horizontal bars. When the length of the scaffolding board is less than 2m, two horizontal bars can be used for support, but the two ends of the scaffolding board should be reliably fixed to it to prevent tipping.
13. When the scaffolding boards are butt-jointed and laid flat, two horizontal bars must be set at the joints. The outward extension of the scaffolding board 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, and the overlap length should not be less than 200mm, and the length extending from 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 base surface with a right-angle fastener. The horizontal sweeping rod should be fixed to the vertical rod close to the bottom of the longitudinal sweeping rod with a right-angle fastener.
15. When the foundation of the vertical pole is not at the same height, the vertical sweeping pole at the high position must be extended to the low position. The two spans must be fixed to the vertical pole, and the height difference should not be greater than 1m. The distance from the vertical pole axis above the slope to the slope should not be less than 500mm.
16. Except for the top step of the top layer, the vertical pole extension can be overlapped, and the joints of the other layers and steps must be connected by 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 synchronization. The distance between the two adjacent joints of every other vertical pole in the synchronization 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 rod end should not be less than 100mm.
17. Wall ties must be set at both ends of the open scaffolding. The vertical spacing of the wall ties should not be greater than the floor height of the building, and should not be greater than 4m. (Scaffolding set up along the non-intersecting circle around the building is an open scaffolding. The outer scaffolding of a general building is arranged continuously along the circumference of the building to form a closed whole, such as the scaffolding on the gable, which 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 and double-row scaffolding with a height of less than 24m must be equipped with a scissors brace at both ends of the outer side, corners and the middle facade not exceeding 15m, and should be set continuously from bottom to top.
20. Double-row scaffolding with a height of 24m or more shall be equipped with scissors braces continuously on the entire outer facade.
21. When the scaffolding is just being erected, since the wall ties have not been set up, to ensure the stability of the scaffolding, a brace should be set up every few spans (mostly 6 spans), that is, an inclined steel pipe, one end of which is connected to the vertical pole with a rotating fastener, and the other end is diagonally braced 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) Carry out layer by layer from top to bottom.
2) The wall ties are dismantled layer by layer and in sections, and 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. Inspection and acceptance of scaffolding:
1) Before the foundation is completed and the frame is erected.
2) After each 6-8m height is erected.
3) Before the load is applied to the working layer.
4) After strong winds of level 6 or above, heavy rain, and freeze-thaw thaw.
5) After reaching the design height.
6) 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 pole is 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, the settlement and verticality of the vertical poles meet the requirements,
4) Whether the safety protection measures are in place,
5) Whether it is overloaded.
Post time: Dec-10-2024