What are the procedures, methods, requirements and safety technical measures for scaffolding?

A, scaffolding component quality standards

1, steel pipe (1) The steel pipe is welded with No.3 steel, with an outer diameter of 48mm and a wall thickness of 3.5mm, with product certificate and inspection report. Serious corrosion must be replaced, and shall not be used for erection of the frame. (2) The steel pipe surface should be straight and smooth, and there should be no cracks, scars, delamination, dislocation, hard bending, burr, indentation and deep scratches. Serious corrosion, bending, flattening, damage and cracks shall not be used. (3) Steel pipes shall be painted with antirust paint. Poles and crossbars shall be painted with yellow antirust paint, and supports and handrails shall be painted with red and white paint. The maximum mass of each steel pipe should not be greater than 25Kg. It is forbidden to punch holes in steel pipes. (4) The length of the steel pipe of the horizontal bar (main rail) in the vertical and horizontal direction is 3-6m, that of the horizontal bar (small rail) is 1. 1 ~ 1.3m, and that of the transverse diagonal bar is 3-4m. 2. Fasteners (1) New fasteners shall have production license, product certificate and inspection report. Old fasteners should be checked for quality before use. Cracks and deformation are strictly prohibited. Bolts with smooth threads must be replaced. Old and new fasteners should rust. Seriously corroded fasteners and damaged fasteners should be repaired and replaced in time. Oil-filled bolts ensure easy use. (2) The joint surface of fasteners and steel pipes should be in good contact. When the fastener clamps the steel pipe, the minimum distance at the opening should be less than 5 mm ... The fastener used shall not be damaged when the bolt tightening force reaches 65N.m 2. Scaffolding construction technology, methods and requirements (1) Scaffolding frame form This project adopts 16# I-beam cantilever single-pole double exclusive scaffolding. Cantilever scaffold step distance 1.8m, vertical distance of vertical poles 1.5m, and the distance between internal and external rows of vertical poles is 0.85m；; The small bar is set below the main bar, with the outer main bar spacing of 0.9m, the inner main bar spacing of 1.8m, and a horizontal bar is added in the middle of the small bar. (2) Scaffolding technology 1, cantilever beam placement on the shelf (1). Cantilever beam rings are embedded according to the scheme requirements, with accurate location and appropriate size. (2) Pay-off and position according to the requirements of the longitudinal distance and transverse distance of the scaffold. (3) I-beams shall be placed one by one, and I-beams shall be placed well. After the stay wire is positioned, it is welded and anchored with steel bars. (4) When the cantilever beam is hoisted, it should be hoisted lightly to reduce the influence on the bending safety of the concrete structure. 2. The erection sequence of scaffolding is to set vertical poles one by one from one end of the corner of the building → place longitudinal sweeping poles (the main rail is close to the cantilever beam), then fasten with vertical poles → install horizontal sweeping poles (the small rail is close to the cantilever beam), fasten with vertical poles → erect 3-4 vertical poles. Install the first-step main rail (pay attention to fastening with the upright post) → Install the first-step small rail (fastening with the main rail) → Install the wall connecting piece (or temporary bracing) → Install the second-step main rail → Install the second-step small rail → Add the third and fourth-step main rail and small rail → Add the wall connecting rod at the corresponding position → Connect the upright post (both 6m)→ Add the bracing and cross brace → Set the block. 3. Precautions for scaffolding (1) Before fixing the bottom of the vertical pole, the vertical pole should be ensured with messenger wire. (2) After correcting the levelness of the upright post and the main rail to meet the requirements, tighten the fastening bolts to form the initial section of the frame body, and extend forward in turn according to the above-mentioned erection order until the first step is completed. After each scaffold step is completed, correct the step distance, longitudinal distance, transverse distance and verticality of the vertical pole to ensure that it meets the requirements, then set up the wall pieces and build the previous step. (3) The erection of scaffolding must be coordinated with the construction progress, and the erection height at a time shall not exceed two steps above the adjacent wall. (3) Scaffolding methods and requirements 1, sweeping bar erection requirements Vertical sweeping bar should be fixed on the vertical pole with right-angle fasteners, and the distance from the basic epithelium is not more than100 mm. The horizontal sweeping bar is fixed on the vertical bar directly below the vertical sweeping bar with right-angle fasteners. 2. Erection requirements for vertical poles (1) Steel pipes used for vertical poles must be painted with antirust paint, and bent steel pipes are not allowed. The vertical pole shall be at least1.5—1.8m higher than the working face. (2) The concrete method of stud joint: the stud must be butt-jointed and lengthened, and the butt-jointed fasteners on the stud should be staggered. The joints of two adjacent vertical poles should not be set synchronously, the staggered distance of two adjacent vertical pole joints in the height direction should not be less than 500mm, and the distance between the center of each joint and the main node should not be greater than 1/3 steps. 3, the main rail erection requirements (1) The main rail is set on the inside of the stud, fixed on the stud with right-angle fasteners, and its length should not be less than 3 spans. In the same step scaffolding, the main rail should be circled and fixed with the vertical rods at the inner and outer corners. (2) The concrete practice of the main rail joint: the main rail joint should be butted, and the butt joints should be staggered and should not be located in the same synchronous span. The horizontal distance between adjacent joints shall not be less than 500mm, and the distance between joints and adjacent uprights shall not be greater than 1/3 of the distance between uprights. 4. When erecting a small bar, it is necessary to set a small bar at the main node (the intersection of the vertical bar and the main bar) and fix it on the upper part of the main bar with right-angle fasteners. The length of the outer end should not be less than 100 mm, the length of the wall end should not be less than 200mm, and the distance from the decorative surface of the wall should not be greater than100 mm. The distance between the axis of the rod and the main node should not be greater than150 mm. Fastener installation requirements (1) Fastener specifications must be the same as the outer diameter of steel pipe. (2) The tightening torque of fasteners shall be 40-50n.m, and the maximum torque shall not exceed 60n.m. Each fastener must meet the requirements. (3) At the master node, the mutual distance between the center points of the right-angle fastener and the rotary fastener used for fixing the small bar, the big bar, the bracing and the lateral diagonal brace should not be greater than150 mm.. (4) The opening of butt fastener should face the inside of the shelf, and the opening of right-angle fastener should not face downward. (5) The length of each rod end protruding from the edge of the fastener cover plate should not be less than 1 00 mm. 6. Requirements for Rachel between the frame and the building structure (1) Structural form: the Rachel point is fixed on the embedded steel pipe with steel pipe fasteners, and the cantilever horizontal steel beam is bound with the building with steel wire rope. Rachel reinforcement must be set on the column, and hold the column inside and outside at the same time. Rachel bars are arranged horizontally. When it can't be arranged horizontally, one end connected with the scaffold should be connected obliquely downwards, but not obliquely upwards. (2) Layout requirements: The wall connectors are arranged in two steps and three spans, with a vertical spacing of 3.6m and a horizontal spacing of 4.5m, and are connected by double fasteners. Scaffolding must be firmly tied with the main body of the building. Set as close as possible to the master node, and the distance from the master node should not be greater than 300 mm It must be set from the first main rail at the bottom and arranged in a diamond shape. (3) Fasteners used for pull-up joints must meet the requirements, and there shall be no loosening of fasteners or bending of embedded steel pipes. 7, the erection method of bracing (1) in the scaffolding outside the whole length and height direction set bracing continuously. Each support is connected with 5 vertical poles. Scissors should be erected synchronously with vertical rods, main rails and small rails. (2) The diagonal braces are fixed on the protruding end of the intersecting ledger or on the upright post with rotating fasteners, and the distance from the center line of the rotating fasteners to the main node should not be greater than 150 mm ... In addition to fastening the diagonal bars at both ends with the upright post, 2-4 fastening points should be added in the middle. The contact distance between the inclined end at the bottom and the upright post is not more than 500mm. The inclination angle between the diagonal bar and the ground should be between 45 and 60. (3) Scissors should be overlapped and lengthened, and the overlapping length should not be less than 1m, and three fasteners should be arranged equidistantly, and the fasteners should be buckled at the ends of steel pipes less than100 mm.. 8. Scaffolding (1) Scaffolding should be set on three small bars, which should be covered, tightly and stably, 300mm away from the wall. (2) Laying method: Scaffolding boards should be tiled, and two small rails must be set under the joints of scaffolding boards laid side by side, with the leg length of 130~ 150mm, and the sum of the leg lengths of two scaffolding boards shall not be greater than 300mm；; When scaffolding is laid in an overlapping way, the joint must be supported on the small bar, the overlapping length should be greater than 200mm, and the length extending out of the small bar should not be less than100 mm. The scaffolding at the corner must be crossed. Scaffolding probe is fixed on the main rail with 18# iron wire. The corner of the scaffold and the mouth of the chute platform should be reliably connected with the small bar to prevent sliding. (3) The construction layer must be covered with scaffolding. 9. For the internal sealing and external protection of scaffolding (1), protective railings with a height of 900mm must be set on the outside of scaffolding at each step. (2) A dense mesh safety net must be set horizontally from bottom to top on the inside of the scaffold outer pole. (3) The external scaffold must be closed once every three layers in the cantilever layer, and the project is closed with wooden formwork. (4) Scaffolding quality requirements: 1, verticality deviation of vertical pole: verticality deviation of vertical pole should not be greater than H/300, and absolute deviation should not be greater than 75 mm ... height deviation should not be greater than H/300 and not greater than100 mm. Horizontal deviation of the main rail: the height difference between the two ends of the main rail shall not exceed 20mm, the horizontal deviation of the main rail shall not exceed 1/300 of the total length, and the flatness deviation of the total length shall not exceed100 mm. The height difference between two main rails in the same span is not greater than10 mm; ; 3. The horizontal deviation of the putlog is not greater than 10mm, the cantilever length deviation is not greater than-10mm ... 4. The deviation of the scaffolding step and the vertical distance of the vertical pole is not greater than 20mm, and the vertical distance of the vertical pole is not greater than 50mm ... 5. The number and position of wall parts should be correct, and the connection should be firm without looseness. Please download the construction technical data for free. 6, safety net must use qualified products, and binding is firm, can not have damaged, binding incomplete phenomenon. 7, steel basketry piece must use 18# wire binding is firm, it is forbidden to appear loose, the phenomenon such as probe plate. 8. I-beams and wire ropes for cantilever must meet the disclosure requirements, and other unqualified materials shall not be used illegally. Three, scaffolding and use safety technical measures 1, scaffolding personnel must be qualified professional scaffolder. Post personnel should have regular physical examination, and only those who pass the physical examination can take up their posts with certificates. 2, scaffolding personnel must wear safety helmet correctly, fasten your seat belt, wear non-slip shoes. When erecting scaffolding, fences and warning signs should be set on the ground, and special personnel should be assigned to guard them. Non-operating personnel are strictly prohibited from entering. 3, scaffolding component quality and erection quality after inspection and acceptance, qualified rear can use. 4. During the use of scaffolding, the following items should be checked regularly: ① Whether the setting and connection of bars and the structures of wall fittings, supports and portal trusses meet the requirements; (2) whether the foundation is waterlogged, whether the base is loose and whether the upright post is suspended; ③ Whether the fastening bolts are loose; (4) whether the settlement and verticality deviation of the vertical pole meet the requirements; ⑤ Whether the safety protection measures meet the requirements; ⑥ Whether it is overloaded. 5. During the use of the scaffold, it is forbidden to dismantle the following members: ① main reinforcement, small reinforcement and vertical and horizontal sweeping rods at the main nodes; (2) even the wall pieces. 6. When workers are working on scaffolding, they should pay attention to their own safety, protect the safety of others and avoid collisions, accidents and falling objects; It is forbidden to frolic on the shelf and sit on the railing in an unsafe place to rest. 7, it is forbidden to pile up on the cantilever frame (wood square, steel pipe, fasteners, jacking, steel and other construction materials. 8. It is forbidden for any team to connect the outer frame with the full frame. 9, the erection of the outer layer, must ensure that the one-time connection is firm. If it is necessary to stop working in heavy rain and windy weather, the frame must be stable. 10, rainstorm, gale, thunder and lightning weather must be stopped, and construction shall not be risky. 1 1. If the downtime is long, the outer frame must be checked and accepted again before use. 12, the erection of an outer frame must be carried out according to the plan. Supplementary contents: a) The erection requirements of internal frames such as elevator shafts are the same as those of external frames. The requirements for the closure of the steel beam and cantilever are in line with the requirements of the external frame. B) The inner frame must be covered with steel basketry under the operation floor, and the frame body is fixed on the wall with short steel pipes or jacks. C) Cantilever horizontal steel beam adopts 16# I-beam, in which the length of the cantilever section outside the building is 1.4m, and the length of the anchorage section inside the building is 2.1m. The diameter of the annular reinforcement at the anchorage point is 20mm D) The upper ring is embedded with Ω-shaped φ 20 reinforcement in the beam.

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