Design of fastener-type steel pipe scaffolding: It must not only meet the operation requirements, but not exceed the allowable limit of the rod’s bearing capacity, and not exceed the allowable load of the design (270kg/㎡). The scaffolding should take measures to unload the overall structure in sections.
Foundation and foundation: Scaffolding foundation and foundation construction must be handled according to the erection height of the scaffolding and the soil conditions of the erection site. The elevation of the scaffolding base should be 50mm higher than the natural floor. The scaffolding foundation must be flat and the backfill soil must be compacted. A base or pad should be provided at the bottom of each vertical pole (standpipe). The scaffolding must be equipped with vertical and horizontal sweeping poles. The longitudinal sweeping poles should be fixed on the vertical poles no more than 200mm away from the base epithelium using right-angle fasteners. The horizontal sweeping pole should be fixed to the vertical pole immediately below the longitudinal sweeping pole using right-angle fasteners.
Structural requirements for longitudinal horizontal poles: The longitudinal horizontal poles should be set inside the vertical poles, and their length should not be less than 3 spans. The length of longitudinal horizontal poles should be connected using butt fasteners, or overlapping (overlapping must comply with: the overlapping length should not be less than 1m, 3 rotating fasteners should be set at equal intervals for fixation, and the end fasteners cover the edge of the plate The distance to the head of the overlapping longitudinal horizontal pole should not be less than 100mm) and the width of the skirting board should not be less than 180mm. The skirting boards on the sides should be fixed on the poles on both sides, and the transverse skirting boards should cover the entire width of the scaffolding.
Safety hazards of scaffolding
Dismantling of scaffolding: According to the dismantling sequence and measures in the construction organization design, it can be implemented only with the approval of the supervisor; the person in charge of the construction unit shall make a technical briefing on the dismantling; debris on the scaffolding and obstacles on the ground should be removed; the purpose of dismantling the scaffolding must be marked In the work area, set up warning signs or fence the area, and assign guardians to prevent unauthorized persons from entering.
Common problems with on-site scaffolding:
1) No or less sweeping poles;
2) The small crossbar is not on the main node;
3) The distance between poles is too large;
4) No or less scissor supports;
5) Lack of connection and fixation with fixtures;
6) The pole is suspended in the air;
7) The skids are missing or the skids are not required;
8) There is a single springboard, the springboard is not tied and fixed, and the probe is too long.
14 things you must remember when building scaffolding
1. When starting to erect poles, one throw brace should be installed every 6 spans until the wall-connecting parts are installed stably before they can be removed according to the situation.
2. The connecting wall parts are rigidly connected and fixed on the concrete columns and beams with iron expansion tubes. The connecting wall parts are arranged in a diamond shape according to the layers. They are installed starting from the first longitudinal horizontal rod on the bottom floor. When the connecting wall is installed, At the construction point of the component, the wall-connecting components should be installed immediately after the vertical poles, longitudinal horizontal poles, and transverse horizontal poles are erected there.
3. The butt fasteners of adjacent poles must not be at the same height, and the top of the poles should be 1 meter higher than the level of the parapet.
4. The scaffolding must be equipped with sweeping poles. The longitudinal sweeping poles should be fixed on the vertical poles no more than 200mm away from the base using right-angle fasteners.
5. The longitudinal horizontal poles should be erected in a circle on all sides and fixed with right-angle fasteners to the inner and outer corner poles. The longitudinal horizontal pole should be set inside the vertical pole, and the length should not be less than 3 spans. Longitudinal horizontal rods are extended using butt fasteners. Butt fasteners are arranged in a staggered manner, and adjacent horizontal rod joints should not be set in the same span. The docking fastener opening should face upward.
6. The scissor braces should be erected simultaneously with the vertical poles, longitudinal horizontal poles, etc., and the lower ends of each bottom-level diagonal pole must be supported on the pad. The scissor braces span 7 vertical poles, and the inclination angle between the inclined pole and the ground is 45 degrees. There are 7 sets of scissor braces on the front of the scaffold and 3 sets of scissor braces on the sides, for a total of 20 sets. The scissor brace steel pipe should be extended using the overlapping method. The overlapping length should not be less than 1 meter and should be fixed with 3 rotating fasteners. The distance from the edge of the end fastener cover to the rod end should not be less than 100mm. The scissor brace diagonal bar should be fixed to the extended end or vertical bar of the transverse horizontal bar that intersects with it by rotating fasteners.
7. The scaffolding boards must be fully paved and the boards must be close to each other. When docking is used, two small cross bars are set at the joint and tied firmly with iron wire.
8. A dense-mesh safety net should be installed on the outside of the scaffolding by regulations, and the safety net should be installed inside the outer row of poles. The dense mesh must be fastened securely to the scaffolding tube. The dense mesh at the corner is clamped with wooden strips and tied firmly to the vertical pole. The dense mesh must be stretched flat and tight.
9. Set up a flat net 3.2 meters away from the first floor, and set up horizontal bars near the building. The inner edge of the net and the scaffolding tube are firmly fixed without gaps. When the building reaches the 3rd floor ribs, a flat net will be installed.
10. The erection personnel must be professional erecting workers who have passed the safety technical assessment management rules for special workers.
11. Erection personnel must wear safety helmets, seat belts, and non-slip shoes.
12. Scaffolding erection should be stopped when there are strong winds of level 6 or above, fog, or rain.
13. Construction work is not allowed after drinking.
14. When erecting scaffolding, fences, and warning signs should be set up on the ground, and designated personnel should be assigned to guard the site. Non-operators are strictly prohibited from entering.
Post time: Apr-28-2024