First, the design of the fastener-type steel pipe scaffold:
It must meet the operating requirements, not exceed the allowable limit of the bearing capacity of the rods, and not exceed the load allowed by the design (270kg/㎡). The scaffolding should take the overall structure segmented unloading measures.
Second, the foundation and base of the scaffolding:
The construction of the scaffolding foundation and base must be handled according to the height of the scaffolding and the soil conditions of the 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 set at the bottom of each vertical pole (vertical pipe).
The scaffolding must be equipped with longitudinal and transverse sweeping rods. The longitudinal sweeping rod should be fixed to the vertical pole not more than 200mm from the top of the base with a right-angle fastener.
The transverse sweeping rod should be fixed to the vertical pole close to the bottom of the longitudinal sweeping rod with a right-angle fastener.
Third, the structural requirements of the longitudinal horizontal bars of the scaffolding:
The longitudinal horizontal bars should be set inside the vertical bars, and their length should not be less than 3 spans.
The longitudinal horizontal bars should be connected by butt fasteners, or overlap (the overlap must meet the following requirements: the overlap length should not be less than 1m, 3 rotating fasteners should be set at equal intervals, and the distance from the edge of the end fastener cover plate to the head of the overlapped longitudinal horizontal bar should not be less than 100mm)
The width of the skirting board should not be less than 180mm, the skirting boards on the sides should be fixed on the vertical bars on both sides, and the skirting boards in the transverse direction should cover the entire width of the scaffolding.
Fourth, the safety hazards of the scaffolding
The removal of the scaffolding:
According to the removal sequence and measures in the construction organization design, it can be implemented only after approval by the supervisor;
The person in charge of the construction unit shall conduct a technical briefing on the removal;
The debris on the scaffolding and the obstacles on the ground should be removed;
The removal of the scaffolding is to mark the working area, set up warning signs or enclose the area, and provide guardians to prevent unauthorized personnel from entering.
Fifth, common problems of on-site scaffolding:
1) No or too few sweeping poles;
2) The small crossbar is not on the main node;
3) The distance between the vertical poles is too large;
4) No scissor braces or too few scissor braces;
5) Lack of connection and fixation with fixed objects;
6) The vertical pole is suspended;
7) Lack of pads or pads are not required;
8) Single springboard, springboard is not tied and fixed, and the probe is too long.
Sixth, 14 precautions that must be remembered when building scaffolding
1. When starting to set up the vertical poles, a brace should be set every 6 spans until the wall connection is installed stably, and then it can be removed according to the situation.
2. The wall connection adopts a rigid connection and is fixed to the concrete column and beam with an iron expansion tube. The wall connection is arranged in a diamond shape according to the layer, starting from the first step of the longitudinal horizontal bar on the bottom layer. When it is set up to the construction point with the wall connection, after the vertical pole, longitudinal horizontal bar, and transverse horizontal bar at that place are set up, the wall connection should be set immediately.
3. The butt fasteners of adjacent vertical poles shall not be at the same height, and the top of the vertical pole shall be 1 meter higher than the parapet.
4. The scaffolding must be equipped with sweeping rods, and the longitudinal sweeping rods shall be fixed to the vertical poles no more than 200mm away from the base with right-angle fasteners.
5. The longitudinal horizontal rods shall be set up in circles all around and fixed with the vertical poles at the inner and outer corners with right-angle fasteners. The longitudinal horizontal rods should be set on the inside of the vertical poles, and the length should not be less than 3 spans. The longitudinal horizontal rods are extended with butt fasteners. The butt fasteners are arranged in an alternating manner, and the joints of adjacent horizontal rods should not be set in the same span at the same time. The butt fastener opening should face upwards.
6. The scissor brace shall be erected synchronously with the vertical poles, longitudinal horizontal poles, etc., and the lower ends of the diagonal poles of each bottom layer must be supported on the pad. The scissor brace spans 7 vertical poles, and the diagonal poles are inclined at an angle of 45 degrees to the ground. There are 7 sets of scissor braces on the front of the scaffolding and 3 sets of scissor braces on the side, totaling 20 sets. The scissor brace steel pipe extension should be overlapped, with an overlap length of not less than 1 meter. It should be fixed with 3 rotating fasteners, and the distance from the edge of the end fastener cover plate to the rod end should not be less than 100mm. The scissor brace diagonal rod should be fixed to the extended end of the horizontal rod or the vertical rod that intersects with it with a rotating fastener.
7. The scaffolding board must be fully spread, and the boards should be close to each other. When butt joint is adopted, two small cross bars are set at the joint and tied firmly with wire.
8. The outside of the scaffolding should be equipped with a dense mesh safety net as required, and the safety net is set inside the outer row of vertical rods. The dense mesh net must be fastened to the scaffolding tube. The dense mesh net at the corner is clamped with wooden strips to clamp the dense mesh net and the vertical rod firmly. The dense mesh net must be stretched flat and tight.
9. A flat net is set at 3.2 meters from the first floor, and a horizontal bar is set near the building. The inner edge of the net is firmly fixed to the scaffolding tube without gaps. When the building is covered to the 3rd floor slab reinforcement, another flat net is set.
10. The erection personnel must be qualified professional scaffold workers by the safety and technical assessment management rules for special workers.
11. The erection personnel must wear safety helmets, safety belts, and non-slip shoes.
12. When there is a strong wind of level 6 or above, fog, or rain, the scaffolding should be stopped.
13. Construction work is not allowed after drinking.
14. When erecting scaffolding, fences, and warning signs should be set up on the ground, and special personnel should be assigned to guard them. Non-operating personnel are strictly prohibited from entering.
Post time: Jul-04-2025