Scaffolding is an indispensable and important facility in construction. It is a working platform and working channel built to ensure the safety and smooth construction of high-altitude operations. In recent years, scaffolding accidents have occurred frequently across the country. The main reasons are: that the construction plan (work instructions) is not handled properly, the construction workers violate the regulations, and the inspection, acceptance, and listing are not implemented in place. At present, scaffolding problems are still common at construction sites in various places, and safety hazards are imminent. Managers must pay enough attention to the safety management of scaffolds, and “strict acceptance inspection” is particularly important.
1. Acceptance of content of foundation and foundation
1) Whether the construction of scaffolding foundations and foundations has been calculated by relevant regulations based on the height of the scaffolding and the soil conditions of the erection site.
2) Whether the scaffolding foundation and foundation are solid.
3) Whether the scaffolding foundation and foundation are flat.
4) Whether there is water accumulation in the scaffolding foundation and foundation.
2. Acceptance content of drainage ditches
1) Clear and level debris at the scaffolding erection site, and make drainage smooth.
2) The distance between the drainage ditch and the outermost row of scaffolding poles should be greater than 500mm.
3) The width of the drainage ditch is between 200mm~350mm, and the depth is between 150mm~300mm.
4) A water collection well (600mm×600mm×1200mm) should be set up at the end of the ditch to ensure that the water in the ditch is drained out in time.
3. Acceptance content of backing plate and bottom bracket
1) The acceptance of scaffolding pads and bottom brackets is based on the height and load of the scaffolding.
2) The pad specifications for scaffolding below 24m are (width greater than 200mm, thickness greater than 50mm, length not less than 2 feet), ensure that each vertical pole must be placed in the middle of the pad, and the pad area shall not be less than 0.15㎡.
3) The thickness of the bottom pad of the scaffolding above 24m must be strictly calculated.
4) The scaffolding bottom bracket must be placed in the center of the pad.
5) The width of the scaffolding bottom bracket shall not be less than 100mm and the thickness shall not be less than 5mm.
4. Acceptance content of sweeping pole
1) The sweeping pole must be connected to the vertical pole, and the sweeping pole must not be connected to the sweeping pole.
2) The horizontal height difference of the sweeping pole shall not be greater than 1m, and the distance from the slope shall not be less than 0.5m.
3) The vertical sweeping pole should be fixed on the vertical pole no more than 200mm away from the base epithelium using right-angle fasteners.
4) The horizontal sweeping rod should be fixed on the vertical pole immediately below the longitudinal sweeping rod using right-angle fasteners.
5. Subject’s acceptance content
1) Scaffolding owner acceptance is calculated based on construction needs. For example, when installing ordinary scaffolding, the distance between vertical poles must be less than 2m, the distance between longitudinal horizontal poles must be less than 1.8m, and the distance between vertical horizontal poles must be less than 2m. The load-bearing scaffolding of the building must be accepted according to the calculation requirements.
2) The vertical deviation of the vertical pole should be based on the data in Table 8.2.4 in the Technical Specification for Fastener Steel Pipe Scaffolding in Construction JGJ130-2011.
3) When the scaffolding poles are extended, except for the top of the top layer, which can be overlapped, the joints of each step of the other layers must be connected with butt fasteners. The joints of the scaffolding body should be arranged in a staggered manner: the joints of two adjacent poles should not be set at the same time or at the same time. Within the same span; the distance between two adjacent joints that are not synchronized or of different spans in the horizontal direction should not be less than 500mm; the distance from the center of each joint to the nearest main node should not be greater than 1/3 of the longitudinal distance; the overlap length should not be less than 1m, three rotating fasteners should be set at equal intervals for fixation, and the distance from the edge of the end fastener cover to the end of the overlapping longitudinal horizontal rod should not be less than 100mm. In double pole scaffolding, the height of the auxiliary pole shall not be less than 3 steps, and the length of the steel pipe shall not be less than 6m.
4) The small crossbar of the scaffolding should be set at the intersection of the vertical pole and the large horizontal bar and must be connected to the vertical pole using right-angle fasteners. When it is on the operating level, a small crossbar should be added between the two nodes to withstand the Transmission of the load on the scaffolding board, right-angle fasteners must be used to fix the small horizontal bars and be fixed on the longitudinal horizontal bars.
5) Fasteners must be used rationally during the erection of the frame, and fasteners must not be substituted or misused. Fasteners with cracks must not be used in the frame.
6. Acceptance content of scaffolding boards
1) After the scaffolding is erected at the construction site, the scaffolding boards must be laid all over and the docking of the scaffolding boards must be correct. At the corners of the scaffolding, the scaffolding boards should be staggered and overlapping and must be tied firmly. Uneven areas should be padded and nailed with wooden blocks.
2) The scaffolding boards on the working floor should be paved, tightly packed, and firmly tied. The probe length of the end of the scaffolding board 120-150mm away from the wall should not be greater than 200mm. The spacing of the horizontal horizontal rods should be set up according to the usage of the scaffolding. The laying can be done by butt tile laying or overlapping laying.
3) When scaffolding boards are used, both ends of the transverse horizontal poles of the double-row scaffolding should be fixed to the longitudinal horizontal poles using right-angle fasteners.
4) One end of the horizontal pole of the single-row scaffolding should be fixed on the vertical pole with right-angle fasteners, and the other end should be inserted into the wall, and the insertion length should not be less than 18cm.
5) The scaffolding boards on the working floor should be fully spread and firmly laid and should be 12cm to 15cm away from the wall.
6) When the length of the scaffolding board is less than 2m, two transverse horizontal rods can be used to support it, but the two ends of the scaffolding board should be aligned and reliably fixed to prevent overturning. These three types of scaffolding boards can be laid flat butt-joint or overlapped. When the scaffolding boards are butted and laid flat, two transverse horizontal rods must be installed at the joints. The external extension of the scaffolding boards should be 130 to 150mm. The sum of the extension lengths of the two scaffolding boards should not be greater than 300mm. When the scaffolding boards are overlapped and laid, the joints must be It must be supported on a horizontal pole, the overlap length should be greater than 200mm, and the length extending out of the horizontal pole should not be less than 100mm.
7. Acceptance of content of wall-connecting parts
1) There are two types of connecting wall parts: rigid connecting wall parts and flexible connecting wall parts. Rigid connecting wall parts should be used at the construction site. Scaffolds with a height less than 24m need to be equipped with wall-connecting parts in 3 steps and 3 spans. Scaffolds with a height between 24m and 50m need to be equipped with wall-connecting parts in 2 steps and 3 spans.
2) The wall-connecting parts should be installed starting from the first longitudinal horizontal pole on the bottom floor of the scaffolding body.
3) The connecting wall parts should be installed close to the main node, and the distance from the main node should not be greater than 300mm.
4) Wall-connecting parts should be arranged in a diamond shape first, but square or pitch shapes can also be used.
5) Wall-connecting parts must be installed at both ends of the scaffolding. The vertical spacing between the wall-connecting parts should not be greater than the floor height of the building and should not be greater than 4m (two steps).
6) Single- and double-row scaffolding with a height of less than 24m should be reliably connected to the building using rigid wall-mounted components. Wall-attached connections using scaffolding tubes, tie bars, and jacking supports can also be used and set up at both ends. Anti-slip measures. It is strictly prohibited to use flexible wall parts with only tie bars.
7) Single and double-row scaffolds with a scaffold body height above 24m must be reliably connected to the building using rigid wall fittings.
8) The connecting wall rods or tie bars in the connecting wall parts should be set horizontally. If they cannot be set horizontally, the end connected to the scaffolding should be connected downwards and reliably.
9) The wall-connecting parts must be of a structure that can withstand tension and pressure.
10) When the lower part of the scaffolding cannot be equipped with wall-connecting parts temporarily, throw supports can be installed. Throw supports should be reliably connected to the scaffolding using full-length rods, and the inclination angle with the ground should be between 45 and 60 degrees; the distance from the center of the connection point to the main node should not be greater than 300mm. Throw supports should be removed separately after the wall-connecting parts are erected.
11) When the height of the scaffolding body is above 40m and there is a wind vortex effect, wall-connecting measures should be taken to resist the upturn effect.
8. Acceptance content of scissor braces
1) Double-row scaffolding with a height of 24m and above should be continuously provided with scissor braces on the entire outer facade; double-row scaffolding with a height of less than 24m must be installed on the facade with an interval of no more than 15m at both outer ends, corners and in the middle. Each scissor brace is designed and should be set up continuously from bottom to top.
2) The scissor brace diagonal rod should be fixed with a rotating fastener on the extended end of the horizontal rod or vertical pole that intersects with it. The distance from the center line of the rotating fastener to the main node should not be greater than 150mm.
3) Both ends of the open double-row scaffolding must be equipped with transverse diagonal braces.
9. Acceptance content of measures for going up and down stairs
1) There are two types of methods for climbing up and down scaffolding: hanging ladders and setting up “zigzag” shaped walking paths or inclined walking paths.
2) The ladder hanging must be set up continuously and vertically from low to high and must be fixed every 3 meters vertically. The top hook should be tied firmly with 8# lead wire.
3) The upper and lower footpaths must be set up together with the height of the scaffolding. The width of the pedestrian footpath shall not be less than 1m and the slope shall be 1:3. The width of the material transport footpath shall not be less than 1.5m and the slope shall be 1:6. The spacing between anti-slip strips is 200~300mm, and the height of the anti-slip strips is about 20-30mm.
10. Acceptance content of frame anti-fall measures
1) If the construction scaffolding needs to be hung with a safety net, check that the safety net is flat, firm, and complete.
2) The outside of the construction scaffolding must be equipped with a dense mesh, which must be flat and complete.
3) Anti-fall measures need to be installed every 10m in the vertical height of the scaffold, and a dense mesh should be installed on the outside of the scaffold in time. The inner safety net must be tightened when laying, and the safety net fixing rope must surround the secure and secure place of the lashing.
Post time: Apr-11-2024