Sweeping pole: As part of the scaffolding project, the sweeping pole is a horizontal pole that is close to the ground and connected to the root of the vertical pole.

Classification:

Longitudinal sweeping pole: sweeping poles arranged longitudinally along the scaffold;

Horizontal sweeping pole: sweeping poles arranged horizontally along the scaffold;

The horizontal sweeping rod is under the longitudinal sweeping rod, and bears the force transmitted by the longitudinal sweeping rod, and transmits the force from the vertical sweeping rod to the foundation through the horizontal sweeping rod.

Construction code for concrete structure engineering GB 50666-2011> 4 Formwork engineering> 4.4 Production and installation

4.4.7 When fastener steel pipes are used as formwork supports, the erection of the supports shall meet the following requirements:

The vertical distance of the vertical pole and the horizontal distance of the vertical pole should not be greater than 1.5m, and the step distance of the support should not be greater than 2.0m; the vertical and horizontal sweeping poles should be installed in the vertical and horizontal directions, and the distance between the vertical sweeping pole and the bottom of the vertical pole should not be greater than 200mm, and the horizontal sweeping pole should Set under the vertical sweeping pole; the bottom of the pole should be set with a base or backing plate.

Construction code for concrete structure engineering GB 50666-2011> 4 Formwork engineering> 4.4 Production and installation

4.4.8 When fastener steel pipes are used as tall formwork supports, the following requirements should still be met:

Vertical and horizontal sweeping rods should be set up on the vertical pole, and the distance between the vertical sweeping pole and the bottom of the vertical pole should not be greater than 200mm;

Technical Code for Safety of Fastener-type Steel Pipe Scaffolding in Construction> 6 Structural Requirements> 6.9 Full Hall Support Frame

6.9.3 The full house support frame should be set with scissors support according to the type of frame body, and should meet the following requirements:

Ordinary type:

1) Continuous vertical scissor braces should be set from bottom to top every 5m-8m on the outer periphery and internal longitudinal and lateral sides of the frame, and the width of the scissor braces should be 5m-8m (Figure 6.9.3-1) .

2) A continuous horizontal scissor support should be set at the intersection plane at the top of the vertical scissor support. When the support height exceeds 8m, or the total construction load is greater than 15kN/m2, or the concentrated line load is greater than 20kN/m for the support frame, horizontal scissor supports should be set on the floor of the sweeping pole. The distance between the horizontal scissors support and the bottom plane of the frame and the distance between the horizontal scissors support should not exceed 8m (Figure 6.9.3-1).

2. Enhanced:

1) When the vertical and horizontal spacing of the vertical poles is 0.9m×0.9m～1.2m×1.2m, every 4 spans (and not more than 5m) on the outer periphery and inside of the frame shall be arranged continuously from the bottom to the top. For vertical scissor support, the width of the scissor support should be 4 spans.

2) When the vertical and horizontal spacing of the vertical poles is 0.6m×0.6m～0.9m×0.9m (including 0.6m×0.6m, 0.9m×0.9m), the outer periphery of the frame and the inner vertical and horizontal every 5 spans (And not less than 3m), continuous vertical scissor supports should be set from bottom to top, and the width of scissor supports should be 5 spans.

3) When the vertical and horizontal spacing of the vertical poles is 0.4m×0.4m～0.6m×0.6m (including 0.4m×0.4m), the outer periphery of the frame and the inner longitudinal and lateral distances shall be from the bottom to 3.2m every 3m～3.2m. A continuous vertical scissor brace is set on the top, and the width of the scissor brace should be 3m～3.2m.

4) Horizontal scissor supports should be set at the intersection plane at the top of the vertical scissor supports, and the horizontal scissor supports of the setting layer of the sweeping pole should be set in accordance with the provisions of the first paragraph of Article 6.9.3, and the distance between the horizontal scissor supports and the bottom plane of the frame The distance to the horizontal scissor brace should not exceed 6m, and the width of the scissor brace should be 3m～5m (Figure 6.9.3-2).

Technical Code for Safety of Fastener-type Steel Pipe Scaffolding in Construction> 6 Structural Requirements> 6.3 Pole

6.3.2 The scaffold must be equipped with vertical and horizontal sweeping rods. The vertical sweeping pole should be fixed on the pole not more than 200mm away from the bottom end of the steel pipe with right-angle fasteners. The horizontal sweeping pole should be fixed on the vertical pole immediately below the vertical sweeping pole with right-angle fasteners.

Technical Code for Safety of Fastener-type Steel Pipe Scaffolding in Construction> 6 Structural Requirements> 6.3 Pole

6.3.3 When the foundation of the scaffold pole is not at the same height, the vertical sweeping pole at the high place must be extended to the low place by two spans and fixed with the pole. The height difference should not be greater than 1m. The distance from the axis of the vertical pole above the slope to the slope shall not be less than 500mm (Figure 6.3.3).6.3.2 

Many people have a problem. Why do so many standards for something as simple as a floor sweeper?

Child, you are still young. We can't just know what the norms are, we must know why.

Next, the editor will also popularize why the sweeping rod is important, and what role it has!

1. The design basis of the safety formwork support. The mechanical calculation of the support formwork is calculated with the support mold with sweeping pole as the calculation mode. In the mode with sweeping pole, the mechanical calculation of the foot of the vertical pole is calculated according to the fixed hinge. If there is no sweeping pole, only one degree of freedom in the vertical direction is constrained. In the horizontal plane, there is only the friction constraint between the steel pipe and the ground. The constraint is very limited, because the frictional resistance of each pole is actually different and insufficient. To constrain the horizontal displacement of the vertical rod, it is easy to cause the vertical rod to "run" and it is difficult to form a fixed hinge. In this way, the actual mechanical condition of the bracket is inconsistent with the original calculation mode. Therefore, even if the formwork support is calculated to be safe, it becomes unsafe or seriously unsafe due to the displacement of the bottom of the pole.

Setting the sweeping rod can effectively increase the overall rigidity of the formwork bracket, and make the force of the vertical rod tend to be even. That is to say, the poles can work together effectively to improve the bearing capacity, and at the same time, it can avoid the phenomenon that the rigidity of the local support is too small and the deformation is too large, which affects the stability of the entire support.

3.For the bottom formwork support, the sweeping rod can avoid the phenomenon of large local deformation of the foundation that will cause the stability of the entire formwork to decrease. As a similar analogy, there is no problem with two people carrying a load of 200 jin, but as long as one slips one foot, the load may fall over. Once the formwork collapses, even if it does not collapse as a whole, it will cause significant losses.