Scaffolding requirements
1. Safety technical requirements for scaffolding erection
1. Shelf workers must undergo professional safety technical training, pass the examination, and hold a special operation certificate to work. Apprentices who are scaffolding workers must apply for a study permit and perform their work under the guidance and guidance of the skilled worker. Non-workers are not allowed to work alone without permission.
2. Shelf workers must undergo a physical examination. Those who suffer from high blood pressure, heart disease, epilepsy, dizziness or high myopia, and who are not suitable for climbing operations are not allowed to engage in high-altitude erection work.
3. To use personal safety protection equipment correctly, you must wear smart clothes (tight and tight sleeves). When working at high places (above 2m), you must wear a safety helmet, buckle your hat belt, and use safety ropes correctly. Hang the vertical and horizontal bars securely. Operators must wear non-slip shoes. Hard-soled slippery shoes, high heels and slippers are strictly forbidden. When working, they must be concentrated, work in solidarity, respond to each other, and command in a unified manner. Do not climb the scaffolding and joking is strictly prohibited , Work after drinking.
4. After the team (team) accepts the task, it must organize all personnel to study and understand the scaffolding special safety construction organization design and safety technical measures, discuss the erection method, clearly divide the labor, and send a skilled and experienced person to be responsible for the erection technology Guidance and supervision.
5. For severe weather such as strong wind and high temperature, heavy rain, heavy snow and heavy fog, such as wind force above level 6 (including level 6), outdoor operations at high places should be stopped.
6. The scaffolding should be erected in accordance with the project progress, and the unfinished scaffolding should be erected. When leaving the post, there should be no unfixed components and unsafe hidden dangers. Make sure that the scaffolding is stable.
7. When scaffolding is erected or dismantled near live equipment, it is advisable to cut off power. When working near external overhead lines, the minimum safety between the outer edge of the scaffold and the edge of the external overhead line
The horizontal distance below 1KV is 4m, the vertical distance is 6m, the horizontal distance of 1-10KV is 6m, the vertical distance is 6m, the horizontal distance of 35-110KV is 8m, and the vertical distance is 7-8m.
8. All kinds of non-standard scaffolds, special scaffolds such as excessively large spans and heavy loads, or other new scaffolds shall be operated according to the opinions approved by the special safety construction organization design.
9. When the scaffolding is erected higher than the top of the building under construction, the inner row of uprights should be 40-50mm lower than the edge, and the outer row of uprights should be 1-1.5m higher than the edge. Two guardrails should be erected and hung tightly. Mesh safety net.
10. Scaffolding must be erected, dismantled, and repaired by scaffolding workers. Non-scraping workers must not engage in scaffolding operations.
11. The scaffolding should be composed of vertical poles, vertical horizontal poles (large horizontal poles, downstream poles), horizontal horizontal poles (small horizontal poles), scissor braces, throwing braces, vertical and horizontal sweeping poles, and pull joints. The scaffolding must have enough The strength, rigidity and stability of the steel, under the allowable construction load, ensure that there is no deformation, no tilt, and no shaking.
12. Before scaffolding is erected, obstacles should be removed, the site should be leveled, the foundation soil should be tamped, and drainage ditch should be made. According to the special safety construction organization design (construction plan) of the scaffold and the requirements of safety technical measures, the line should be laid out and positioned after the foundation is qualified.
13. The backing board should be a wooden board with a length of not less than 2 spans and a thickness of not less than 5cm. Channel steel can also be used, and the base should be accurately positioned.
14. The vertical poles should be vertically aligned and horizontally aligned, and the vertical deviation shall not exceed 1/200. The length of the vertical pole should be connected by butting fasteners, and the two adjacent vertical pole joints should be staggered by 500mm and must not be in the same frame. Vertical and horizontal sweeping poles should be installed at the foot of the vertical pole.
15. The longitudinal horizontal height difference of the longitudinal horizontal rod in the same step frame shall not exceed 1/300 of the full length,
The local height difference shall not exceed 50mm. Longitudinal horizontal rods should be connected by butt fasteners, and the two adjacent longitudinal horizontal joints should be staggered by 500mm and must not be in the same span.
16. The horizontal horizontal rod should be located at the intersection of the vertical horizontal rod and the vertical rod, perpendicular to the vertical horizontal rod. The end of the horizontal horizontal rod should extend more than 100mm from the outer vertical rod, and 450mm beyond the inner vertical rod.
17. The setting of the scissor brace should be continuously set on the entire height of the outer facade. The angle between the scissors support and the ground is 45°-60°.
18. Scissors support diagonal rods should be fixed on the protruding end or vertical rod of the horizontal horizontal rod (small cross rod) that intersects with a rotating fastener. The distance from the center line of the rotating fastener to the main node should not be greater than 150mm.
19. Both ends of the scaffold must be provided with horizontal diagonal bracing, and one should be provided every 6 spans in the middle.
20. The small cross bars on the same elevation should be arranged in a staggered manner, and the vertical bars should be straight up and down.
21. The scaffold must be set up with a guard area, and it is strictly forbidden to stand and rest under the scaffold. Non-operating personnel are strictly prohibited from entering the warning area.
22. When scaffolding is erected, upper and lower passages and pedestrian passages must be set up. The passages must be kept unblocked. It is strictly forbidden to pile materials on the passages. The establishment of the channel must meet the requirements of the specification.
23. It is strictly forbidden to tie wires and cables directly to the scaffolding. The wires and cables must be tied to wood or other insulators.
Second, the requirements of the scaffold
1. The scaffold can be made of steel and wood, and the weight of each piece should not be greater than 30kg.
2. Wooden scaffolding boards should be made of cedar wood or pine wood, with a length of 2-6m, a thickness of not less than 5cm, and a width of 23-25cm. Plates with decay, cracks, diagonal lines and large cross-sections are not allowed.
Two galvanized steel wire hoops with a diameter of 4mm should be set at both ends, and no probe board is allowed.
3. The bottom of the scaffold must be paved, toe boards should be installed, and the four corners of the scaffold should be protected against lightning.
Three, steel pipe requirements
1. The steel pipe adopts a pipe with an outer diameter of φ48mm. The steel pipe should be straight and smooth, free of cracks, delamination, hard bends, burrs, indentations and deep scribes. The steel pipe should have a product certificate, and the steel pipe must be coated with anti-rust paint and must not be punched.
2. The size of the scaffolding steel pipe has an outer diameter of φ48mm, a wall thickness of 3.5mm, a horizontal horizontal rod of 2200mm, and other rods of 6000-6500mm.
Four, fastener requirements
1. For fasteners made of forgeable iron, the material should comply with the current national standard "Steel Pipe Scaffolding Fasteners" (GBI5831-1995). The new fastener must have a product certificate.
2. The quality inspection of old fasteners should be carried out before use. If there are cracks or deformations, it is strictly prohibited to use them. The bolts with sliding teeth must be replaced.
3. The tightening torque of all fasteners should reach 45-55N.m.
5. Safety net requirements
1. The width of the flat net shall not be less than 3m, the length shall not be greater than 6m, and the height of the vertical net shall not be less than
1.2m, the mesh is set according to the requirements of use, and the maximum should not be less than 10cm. Materials such as vinylon, nylon, nylon, etc. must be used. Damaged or decayed safety nets and polypropylene nets are strictly prohibited. Secret mesh safety nets are only allowed to be used as Linets.
2. The safety net should be parallel to the horizontal or high outside and low inside, generally 15º.
3. The load height of the net generally does not exceed 6m (including 6m). Due to construction needs, it is allowed to exceed 6m, but the maximum shall not exceed 10m, and safety measures such as wire rope buffering must be added.
When the load height is less than 5m (including 5m), the net should extend out of the building (or the most marginal operating point) at least 2.5m. When the load height is above 5m to 10m, it should extend at least 3m.
4. The safety net should not be too tight during installation. After installing the net with a width of 3m and 4m, the width of the horizontal projection is 2.5m and 3.5m respectively.
5. The maximum gap between the safety net plane and the edge of the plane supporting the operator shall not exceed 10cm. The spacing between the slashes of the safety net should not be greater than 4m.
6. After the operation in the protected area stops, it can be dismantled.
7. Demolition must be carried out under the close supervision of experienced personnel.
8. The safety net should be removed from top to bottom. At the same time, other fall prevention and physical shock measures should be taken according to the site conditions, such as wearing safety belts and safety helmets.
