Must meet the work requirements and must not exceed either the members' allowable load-bearing limits or the designed allowable load (270 kg/m²). The scaffolding should adopt overall structural measures for segmented load relief.
Ⅱ.Requirements for Scaffolding Foundation and Base:
Construction of the scaffolding foundation and base must be performed based on the scaffold height and on-site soil conditions.
The scaffold base elevation should be 50mm higher than the natural ground level. The scaffold foundation must be level, and the backfilled soil must be compacted.
A base plate or footing pad must be installed at the bottom of each vertical pole (standpipe).
Scaffolds must have both longitudinal and transverse sweep braces. Longitudinal sweep braces should be fixed to the vertical poles at a height not exceeding 200mm from the top of the base using right-angle couplers.
Transverse sweep braces should be fixed to the vertical poles directly below the longitudinal sweep braces using right-angle couplers.
Ⅲ.Structural Requirements for Longitudinal Horizontal Poles of the Scaffold:
Longitudinal horizontal poles should be placed on the inner side of the vertical poles and should have a length of not less than 3 spans.
Connections for longitudinal horizontal poles should adopt butt couplers or be lapped (lapping must meet the following requirements: the lap length should not be less than 1 meter, fixed with three evenly spaced swivel couplers; the distance from the edge of the end coupler cover plate to the end of the lapped longitudinal horizontal pole should not be less than 100mm).
The width of the toe board should not be less than 180mm. Side toe boards should be fixed to the vertical poles on both sides, and transverse toe boards should cover the entire width of the scaffold.
Ⅳ.Scaffolding Safety Hazards and Dismantling Requirements:
Scaffold Dismantling:
Must be carried out in accordance with the dismantling sequence and measures specified in the construction organization plan, and can only proceed after approval by the supervisor.
The responsible person of the construction unit must conduct a technical briefing on the dismantling work.
Debris on the scaffold and obstacles on the ground shall be cleared.
During dismantling, the work area should be demarcated, warning signs or barriers should be set up, and a watchkeeper should be assigned to prevent unauthorized personnel from entering.
Ⅴ.Common Problems with On-site Scaffolding:
1. Missing sweep braces or an insufficient number of sweep braces;
2. Small horizontal poles not positioned at the main node points;
3. Excessive spacing between vertical poles;
4. Missing cross braces or an insufficient number of cross braces;
5. Lack of connection/fixation to stable structural elements;
6. Vertical poles hanging without support;
7. Missing footing pads or pads that do not meet requirements;
8. Single-plank scaffold boards, improperly lashed/fixed boards, and excessive board overhang (tip).
Ⅵ.14 Key Points to Remember When Erecting Scaffolding:
1. When commencing the erection of vertical poles, a temporary diagonal brace should be installed every 6 spans until the wall connectors are installed and stable, after which they may be removed as appropriate.
2. Wall connectors should adopt rigid connections, fixed to concrete columns and beams using expansion anchors. Wall connectors should be arranged in a diamond pattern, floor by floor, starting from the first step of the bottom longitudinal horizontal pole. When reaching a structural position requiring a wall connector during erection, the wall connector must be installed immediately after the vertical pole, longitudinal horizontal pole, and transverse horizontal pole at that position are installed.
3. Butt couplers of adjacent vertical poles must not be at the same height. The top of each vertical pole should extend 1 meter above the parapet wall.
4. Scaffolds must have sweep braces. Longitudinal sweep braces should be fixed to the vertical poles at a height not exceeding 200mm from the base using right-angle couplers.
5. Longitudinal horizontal poles should run continuously around the scaffold perimeter and be fixed to the vertical poles at inner and outer corners using right-angle couplers. They should be placed on the inner side of the vertical poles, with a length of not less than 3 spans. Longitudinal horizontal poles should be extended using butt couplers and arranged in a staggered manner. The joints of adjacent horizontal poles must not appear simultaneously in the same span. The opening of each butt coupler should face upwards.
6. Cross braces should be erected simultaneously with vertical poles, longitudinal horizontal poles, and other components. The lower end of all bottom diagonal members must rest on the footing pad. Cross braces should span 7 vertical poles, with the diagonal member inclined at an angle of 45 to 60 degrees to the ground. The front face of the scaffold should have 7 sets of cross braces, the sides should have 3 sets each, totaling 20 sets. Cross brace steel tubes should be extended by lapping, with a lap length not less than 1 meter, secured with 3 swivel couplers. The distance from the edge of the end coupler cover plate to the end of the member should not be less than 100mm. The diagonal members of the cross braces should be fixed to the protruding end of the intersecting transverse horizontal pole or to the vertical pole using swivel couplers.
7. Scaffold boards must be fully decked and closely fitted together. When laid in a butt joint, the joint should be supported by two small horizontal poles and securely lashed.
8. The outside of the scaffold should have a tightly woven safety net installed as required, positioned on the inside of the outer row of vertical poles. The mesh net must be securely lashed to the scaffold steel tubes. At corners, the mesh net should be clamped with wooden strips to ensure firm fixation to the vertical poles. The mesh net must be tensioned and laid flat.
9. A horizontal safety net should be installed 3.2 meters above the first-floor ground level, with a horizontal pole installed near the building. The inner edge of the net should be securely fixed to the scaffold steel tubes, with no gaps left. When construction progresses to the third-floor slab reinforcement placement stage, another horizontal safety net should be installed.
10. Erectors must be professional scaffolders qualified in accordance with the "Rules for the Assessment and Management of Safety Technology for Special Operation Personnel."
11. Erectors must wear safety helmets, fasten their safety harnesses, and put on anti-slip shoes.
12. Scaffold erection work should be suspended in case of level 6 or higher strong winds, heavy fog, or rainy weather.
13. Working under the influence of alcohol is strictly prohibited.
14. During scaffold erection, barriers and warning signs should be set up on the ground, and a dedicated watchkeeper should be assigned. Unauthorized personnel are strictly prohibited from entering the work area.
Post time: 2026-02-11 09:21:13