In the field of outdoor building materials construction, the standardized erection of scaffolding sweeping poles is the core link to ensure construction safety. The following is a systematic analysis from three aspects: specification parameters, common hidden dangers, and rectification plans.
First, the specification parameters and technical requirements of scaffolding sweeping poles
1. Height threshold
Fastener/door sweeping pole: ≤200mm from the ground (GB55023-2022); disc-type allows ≤300mm (JGJ231-2010). Actual measurements show that when the traditional scaffolding pole exceeds 200mm, the stability coefficient of the pole decreases by 30%-45%.
2. Logic of vertical and horizontal layout
The vertical sweeping pole is on the top and the horizontal pole is on the bottom (JGJ130-2011). If the horizontal pole is placed on the top, the force of the fastener will be unbalanced.
3. Materials and construction
The tightening torque of the main node fastener is 40-65N·m (sampling rate ≥10%); the base of the vertical pole needs to be equipped with a wooden pad or I-beam base with a width of ≥200mm and a thickness of ≥50mm, and the flatness deviation of the concrete base is ≤3mm. Brickwork support is prohibited.
Second, the fatal hidden danger of over-limit erection of scaffolding sweeping poles
1. Failure of mechanical mechanism
When the sweeping pole exceeds 200mm, a cantilever structure is formed at the bottom of the pole. When the height is 400mm, the slenderness ratio λ reaches the critical value, and the critical load drops to 60% of the theoretical value.
2. Tracing the source of the collapse accident
Case: A construction site in Jiangsu collapsed due to a sweeping pole 500mm high, and the support point of the pole moved up and exceeded the safety limit.
Third, on-site rectification plan and technical compensation for scaffolding sweeping rods
1. Remedial measures
Scheme 1: Reduce the distance between vertical poles to 1.2m×1.2m;
Scheme 2: Add 200mm longitudinal horizontal rods;
Scheme 3: Arrange diagonal braces in a zigzag shape (square steel 100×100×5mm), weld height ≥6mm, and use M20 high-strength parts for bolt connection.
2. Acceptance focus
The foundation needs to be hardened with C20 concrete (thickness ≥150mm), with a bearing capacity of ≥80kPa; the top adjustable bracket screw extends ≤300mm, and the insertion depth is ≥150mm.
The scaffolding sweeping rod specification is a concrete manifestation of mechanical logic. Managers need to implement the “three-check principle”: check height, direction, and node torque to achieve the dual commitment of “quality building materials” and “safe landing”.
Post time: Jun-30-2025