Dismantling steps of external scaffolding and problems needing attention

Steps for dismantling the external scaffold:

1, before dismantling scaffolding, materials, tools and sundries on scaffolding should be removed.

2, dismantling scaffolding, should set up a warning zone, set up warning signs, and there are people who are responsible for the alert.

3, the dismantling of scaffolding, should be based on the principle of first, according to the following procedures:

(1) Dismantle the handrails and handrails at the top of the side span, then dismantle the scaffolding (or horizontal frame) and escalator section, and then dismantle the horizontal bar reinforcement bar and scissors. ?

(2) Remove the cross brace from the top span, and at the same time, remove the top brace even the wall rod and the top portal frame. ?

(3) Continue to dismantle the portal frame and accessories in the second step synchronously. The free cantilever height of scaffold shall not exceed three steps, otherwise temporary Rachel shall be added.

(4) Dismantle the base, transport the pad and pad.

When dismantling scaffolding, the following safety items must be observed:

1. Workers must stand on temporary scaffolding for demolition.

2, demolition work, it is forbidden to use a hammer and other hard objects to hit, pry. The removed connecting rod should be put into the bag, and the lock arm should be transferred to the ground and stored indoors. ?

3. When disassembling the connecting parts, first turn the lock plate on the lock seat and the lock plate on the hook to the open position, and then start disassembling. It is not allowed to pull and knock hard.

4. The removed portal frames, steel pipes and fittings shall be bundled and transported to the ground by mechanical lifting or derrick to prevent collision. Do not throw them.

Extended data:

Compared with the general structure, the working conditions of scaffolding have the following characteristics:

1, with large load variability;

2. The fastener joint is semi-rigid, and the joint stiffness is related to the fastener quality and installation quality, and the joint performance is quite different;

3. There are initial defects in scaffold structure and components, such as initial bending and corrosion of members, large erection size error and eccentric load;

4, and the connection point of the wall, scaffolding binding variation is bigger. The research on these problems lacks systematic accumulation and statistical data, and does not have the conditions for independent probability analysis. Therefore, the value of the structural resistance less than 1 multiplied by the adjustment factor is determined by the previously adopted safety factor calibration.

Therefore, the design method adopted in this specification is semi-probabilistic and semi-empirical in nature. It is the basic condition for design and calculation that scaffolding meets the structural requirements specified in this specification.

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