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Foundation (1), distance positioning
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According to the structural requirements, measure the distance between the inner and outer vertical poles and the wall with ruler at the four corners of the building, and mark well; Straighten with steel tape and mark the pole with small bamboo; The base plate and base should be accurately placed on the positioning line, and the base plate must be laid flat and not suspended（ 2) In the process of erecting the first floor scaffold, an inclined support is set in each frame grid along the four sides, and it is added in two directions at the corner
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The scaffold can be removed only after it is reliably tied with the wall connecting parts of the main structure
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When the scaffold operation layer is two steps higher than the wall connecting parts, the external row should be erected first, and then the internal row should be erected
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The rest shall be erected according to the following structural requirements（ 3) The foundation of the scaffold of the project shall be tamped after backfill, and hardened with concrete with strength grade no less than C15, and the hardened thickness of concrete shall not be less than 10cm
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The bearing capacity of the foundation can meet the erection requirements of the external scaffold (refer to the scaffold calculation sheet for the specific calculation data)
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The elevation of the pole base plate or the base surface is 50 mm ~ 100 mm higher than the natural floor, and drainage ditches are set on both sides to ensure smooth drainage（ 4) The size of base plate shall be wooden base plate or channel steel with length not less than 2 spans, thickness not less than 50 mm and width not less than 200 mm
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Pole foundation, drainage ditch schematic diagram 2, wire rope unloading (1), tension anchor ring in beam and slab must be used above 75% of the design strength of concrete
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Hooks and rings must be made of round steel, and rebar is not allowed（ 2) Send workers to tie up the steel wire rope of the upper pull ring, at least 3 clamps shall be used to fasten, and all the screws of the steel wire rope binding head shall be tightened, and loosening is not allowed（ 3) Carry out safety inspection on the whole frame
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If the steel wire rope is found to be loose, rusty or the weld is desoldered, it shall be repaired immediately and can be used after it is qualified
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Wire rope clamp method 3
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Vertical pole setting (1)
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Vertical pole is connected by butt joint, and vertical pole and longitudinal horizontal pole are connected by right angle fastener
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The joint positions are staggered, and the joints of two adjacent vertical members should not appear in the same span at the same time, and the staggered distance in the height direction should not be less than 50cm; The distance between the center of each joint and the main node is not more than 1 / 3 of the step distance（ 2) The joint of the upper single vertical pole and the lower double vertical pole is connected by one of the single vertical pole and the double vertical pole
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The main vertical pole and the auxiliary vertical pole are connected by rotating fasteners, and the number of fasteners shall not be less than 2
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A cushion block shall be set at the bottom of each vertical pole, and vertical and horizontal sweeping poles must be set
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The longitudinal sweeping pole shall be fixed on the vertical pole no more than 200 mm away from the base with right angle fasteners
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The horizontal sweeping pole shall also be fixed on the vertical pole close to the longitudinal sweeping pole with right angle fasteners（ 3) When the foundation of the vertical pole is not at the same height, the vertical sweeping pole at the high place must be extended to the low place for two spans and fixed with the vertical pole, and the height difference shall not be greater than 1m
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The distance between the axis of the vertical pole above the slope and the slope shall not be less than 500mm（ 4) The vertical deviation of the vertical pole should be controlled within 1 / 400 of the height of the frame（ 5) When starting to set up the pole, set up a throw brace every 6 spans, until the wall connecting piece is installed stably, it can be removed according to the situation（ 6) The structural requirements of vertical and horizontal bars are shown in the figure below
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The vertical and horizontal horizontal rods (1) and the longitudinal horizontal rods are set at the inner side of the vertical rod, and their length is not less than 3 spans
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The longitudinal horizontal bar should be connected by butt fastener or lap joint
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The requirements are as follows: when butt joint is used, the butt fasteners should be staggered, and the joints of two adjacent longitudinal horizontal bars should not be set at the same time or span; The horizontal staggering distance between two adjacent joints of different spans or different spans shall not be less than 500mm; The distance between the center of each joint and the nearest main node should not be greater than 1 / 3 of the longitudinal distance
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When overlapping is adopted, the overlapping length shall not be less than 1m, three rotating fasteners shall be set at equal intervals for fixation, and the distance from the edge of end fastener cover plate to the end of overlapping longitudinal horizontal bar shall not be less than 100 mm
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A transverse horizontal bar is arranged at the intersection of the vertical bar and the longitudinal horizontal bar, and both ends are fixed on the vertical bar to form the overall stress of the spatial structure
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Layout of butt joint of longitudinal horizontal bar 5
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Setting of cross bracing (1)
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For double row scaffold with height of 24m and above, cross bracing shall be set continuously on the outside full facade; For single and double row scaffolds with a height of less than 24m, one cross brace must be set at both ends of the outer side, at the corner and on the facade with an interval of not more than 15m in the middle, and it shall be set continuously from the bottom to the top
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The width of each cross brace should not be less than 4 spans, and should not be less than 6m, and the angle between the diagonal bar and the ground should be 45 °~ sixty ° Between（ 3) The length of diagonal bar of cross bracing shall be overlapped or butted
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When the overlapped connection is adopted, the lap length shall not be less than 1m, and it shall be fixed with not less than 2 rotating fasteners
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The distance from the edge of the end fastener cover plate to the end of the bar shall not be less than 100 mm
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Cross bracing (vertical pole) lap structure cross bracing (vertical pole) lap structure (4), cross bracing diagonal pole shall be fixed on the extended end or vertical pole of the transverse horizontal bar intersected with it by rotary fastener, and the distance between the center line of the rotary fastener and the main node shall not be greater than 150 mm（ 5) Transverse diagonal braces must be set at the two fracture surfaces of double bent, I-type and open type
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One overlapping diagonal brace shall be set at the corner and every six spans in the middle of the frame more than 24 meters
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The transverse diagonal braces should be arranged in a zigzag shape from bottom to top in the same section, and the diagonal braces should be crossed and connected with the inner and outer cross bars to the top
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Diagonal bracing diagram 6
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Scaffold board and scaffold piece laying requirements (1)
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Scaffold board shall be laid between the scaffold row pole and the structural layer, and scaffold board shall be fully laid between the inner and outer poles without probe board
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The two ends of the scaffold board shall be reliably fixed with the horizontal bar to prevent tipping（ 2) The scaffold pieces of the full paving layer must be laid horizontally and vertically to the wall, and the full paving shall be in place without leaving any space
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Effective protective measures must be taken at the places where the full paving cannot be carried out（ 3) The scaffold piece shall be bound in parallel with 12-14 ᦇ lead wires at no less than 4 points
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The binding shall be firm and the joint shall be smooth
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The scaffold piece shall be intact when laying, and the damaged one shall be replaced in time
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The left side is the butt joint of scaffold board, and the right side is the lap joint (4)
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The scaffold board at the corner and ramp platform should be reliably connected with the horizontal bar to prevent sliding; 7
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The protective railings (1) and the outside of the scaffold shall be closed with the qualified green dense mesh safety net certified by the competent department of construction, and the safety net shall be fixed on the inside of the outer vertical pole of the scaffold（ 2) 18 ᦇ lead wire is selected to hang the safety net, which is required to be tight and smooth（ 3) 2 protective railings and 18 cm high toe board must be set at 0.6 m and 1.2 m high positions on the construction operation layer outside the scaffold, and the railings and toe boards shall be set at the inner side of the outer vertical pole（ 4) 2 protective railings and 18cm high toe boards shall be set at 0.6m and 1.2m high positions inside the scaffold
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8
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The door opening (1) and the door opening of single and double row scaffolds should adopt the truss structure of rising inclined rod and parallel chord (see the figure below), and the inclination angle between the inclined rod and the ground should be the same α It should be 45 °~ sixty ° between
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The type of door opening truss should be determined according to the following requirements: 1) when the step distance (H) is less than the longitudinal distance (LA), type A should be adopted; 2) When the step distance (H) is greater than the longitudinal distance (LA), type B should be used, and the following requirements should be met: 3) when h = 1.8m, the longitudinal distance should not be greater than 1.5m; When h = 2.0m, the longitudinal distance should not be greater than 1.2m.
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