Q & A in scaffolding

1. What is the function of the scissor brace on the scaffolding?
Answer: Prevent longitudinal deformation of the scaffold and enhance the overall stiffness of the scaffold.
2. What are the safety regulations when there are external power lines on the outside of the scaffolding?
Answer: It is strictly prohibited to set up ramps with upper and lower scaffolding on the side with external power lines.
3. Can the scaffolding be connected to the unloading platform?
Answer: No, the unloading platform should be set up independently.
4. Which steel pipes are not allowed to be used for scaffolding?
Answer: Steel pipes that are severely corroded, flattened, bent, or cracked.
5. Which fasteners cannot be used?
Answer: Anything with cracks, deformation, shrinkage, or slippage must not be used.
6. What signs should be hung on the unloading platform?
Answer: A warning sign with a limited load.
7. How many meters should the erection height of portal scaffolding generally be?
Answer: It should not exceed 45m.
8. When the load-bearing wire rope and the safety wire rope of the crane are extended and used, there should be no less than three rope clamps. Is this correct?
Answer: Incorrect, because these two types of steel wire ropes cannot be extended for use.
9. What are the safety requirements for the overall lifting frame when lifting?
Answer: No one is allowed to stand on the frame when it is being raised or lowered.
10. What are the main safety devices of the overall hoist?
Answer: Anti-fall device and anti-overturning device.
11. What safety protection devices must be equipped with hanging basket scaffolding?
Answer: Brake, travel limit, safety lock, anti-tilt device, overload protection device.
12. What are the requirements for counterweight of hanging basket scaffolding?
(1) The suspension mechanism of the hanging basket or the roof trolley must be equipped with appropriate counterweights;
(2) The counterweight should be accurately and firmly installed on the counterweight point, and a counterweight of sufficient quality should be configured according to the drawings. The hanging basket must be verified by a safety inspector before use;
(3) The anti-overturning coefficient is equal to the ratio of the counterweight moment to the forward tilting moment, and the ratio should not be less than 2.
13. How much higher should the top of the scaffolding pole be than the roof?
Answer: The top of the vertical pole should be 1m higher than the upper surface of the parapet and 1.5m higher than the upper surface of the cornice.
14. Is steel and bamboo mixed scaffolding available? Why?
Answer: Not available. The basic requirement of the scaffolding is that it does not sway or deform and remains stable after the overall force is applied. The nodes of the rods are the key to transmitting force. However, the mixed scaffolding does not have reliable binding materials, resulting in loose nodes and deformation of the frame, which cannot meet the stress requirements of the foot frame.
15. At what stages should scaffolding and its foundation be inspected and accepted?
(1) After the foundation is completed and before the scaffolding is erected;
(2) Before applying load on the working layer;
(3) After each installation is completed at a height of 6 to 8 meters;
(4) After encountering Category 6 strong winds and heavy rain, or after freezing occurs in cold areas;
(5) After reaching the design height;
(6) Discontinuation for more than one month.
16. What protective equipment should workers engaged in scaffolding erection wear?
Answer: Wear a helmet, seat belt, and non-slip shoes.
17. During the use of scaffolding, which rods are strictly prohibited from being removed?
Answer: (1) Longitudinal and transverse horizontal rods at the main node, vertical and horizontal sweeping rods;
(2) Wall-connecting parts.
18. What conditions must be met by personnel engaged in shelf erection operations?
Answer: Scaffolding erection personnel must be professional scaffolders who have passed the assessment by the current national standard “Safety Technical Assessment and Management Rules for Special Operators”. Employees should have regular physical examinations, and only those who pass the test can work with a certificate.
19. What are the requirements for the scissor brace setting of portal steel pipe scaffolding in the “Safety Technical Specifications for Portal Steel Pipe Scaffolding in Construction”?
Answer: (1) When the height of the scaffolding exceeds 20m, it should be continuously installed on the outside of the scaffolding;
(2) The inclination angle between the scissor brace diagonal pole and the ground should be 45-60 degrees, and the scissor brace width should be 4-8m;
(3) The scissor brace should be fastened to the mast pole using fasteners;
(4) If the scissor support diagonal rod is connected by overlap, the overlap length should not be less than 600mm, and the overlap should be fastened with two fasteners.
20. What are the requirements for the overall verticality and horizontality deviation of the scaffolding during the erection of portal scaffolding?
Answer: The allowable deviation of verticality is 1/600 and ±50mm of the height of the scaffold; the allowable deviation of horizontality is 1/600 and ±50mm of the length of the scaffold.
21. What are the load requirements for masonry frames and decorative frames?
Answer: The load of the masonry frame should not exceed 270kg/m2, and the load of the decorative scaffolding should not exceed 200kg/m2.
22. What anti-slip measures should be taken for herringbone ladders?
Answer: There should be strong hinges and zippers that restrict expansion, and anti-slip measures should be taken when using it on slippery floors.