The small cross bar must be fixed on the longitudinal horizontal bar with right angle fasteners
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2) The vertical deviation of the vertical pole shall be implemented according to the data in table 8.2.4 of the technical specification jgj130-2011
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For scaffolds with height less than 24m, the wall connecting parts should be set in three steps and three spans
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3) The width of the drainage ditch is between 200 mm and 350 mm, and the depth is between 150 mm and 300 mm
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3) When scaffold board is used, both ends of horizontal bar of double row scaffold shall be fixed on vertical bar with right angle fastener
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➤ wrong example: the plate is cracked, the plate is moldy, the thickness of the plate is not up to 5cm, the scaffold plate has a gap, the spacing of the cross bar is large, the scaffold plate is not fully paved, the plate is not tied, the end of the scaffold plate is not blocked, the scaffold plate is not fully paved, the plate is not tied ➤ correct example: the scaffold plate butt joint / lap structure 7 wall connecting parts ➤ acceptance content 1) there are two types of wall connecting parts: rigid wall connecting parts and flexible wall connecting parts The rigid wall connecting parts should be used in the construction site
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6) When the length of the scaffold board is less than 2m, it can be supported by two horizontal bars, but the two ends of the scaffold board should be fixed to it reliably to prevent tipping
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3) The longitudinal sweeping pole shall be fixed on the vertical pole not more than 200 mm away from the base with right angle fasteners
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5) In the process of frame erection, fasteners must be used reasonably, and can not be substituted or misused
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The probe length of the scaffold board at the end of 120-150 mm away from the wall shall not be more than 200 mm
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10 items of scaffold acceptance: ① foundation and foundation; ② drainage ditch; ③ base plate and bottom support; ④ sweeping pole; ⑤ main body; ⑥ scaffold board; ⑦ wall connecting parts; Ⅷ cross bracing; Ⅸ up and down measures; Ⅹ scaffold anti falling measures; 1 Foundation and foundation; 1 acceptance content: 1) whether the construction of scaffold foundation and foundation has been carried out according to the scaffold erection height and soil condition of erection site calculation
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The scaffold board can be laid either by butt joint or by lap joint
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3) The thickness of the base plate at the bottom of the scaffold more than 24m must be strictly calculated
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4) The wall connecting parts should be arranged in diamond shape, square shape and distance shape.
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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
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The spacing of the horizontal bar shall be set up according to the use of the scaffold
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In double pole scaffold, the height of auxiliary pole shall not be less than 3 steps, and the length of steel pipe shall not be less than 6m
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3) After the erection of 6-8m height
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The scaffold bearing the building must be accepted according to the calculation requirements
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The management personnel must pay enough attention to the safety management of scaffold, and “strict acceptance” is particularly important
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At the corner of the scaffold, the scaffold board shall Staggered lap, and must be bound, uneven with wood block pad nail firm
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The joints of the scaffold body should be staggered: the joints of two adjacent poles should not be set in the same span or in the same synchronization; the horizontal staggering distance of two adjacent joints in different spans should not be less than 500mm; the distance between the center of each joint and the nearest main node should not be less than 500mm The distance should not be greater than 1 / 3 of the longitudinal distance; the lap 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 plate to the end of the lap longitudinal horizontal bar should not be less than 100 mm
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6) In case of force 6 or above wind or heavy rain, the frozen area will be thawed
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4) A water collecting well (600mm × 600mm × 1200mm) should be set at the end of the ditch to ensure that the water in the ditch is discharged in time
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The basic reasons are: the construction scheme (operation instruction) has been handled, the construction personnel have violated the regulations, and the inspection, acceptance and listing are not carried out in place
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In recent years, scaffolding accidents occur frequently all over the country
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5) The scaffold board of operation layer shall be fully and stably paved, 12cm ~ 15cm away from the wall
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➤ error examples ➤ correct examples 3 base plate and bottom bracket ➤ acceptance content 1) the acceptance of base plate and bottom bracket of scaffold is determined according to the height and bearing capacity of scaffold
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4) Before the load is applied on the working face
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8) Before removal
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5) After reaching the design height (each layer of scaffold for structural construction shall be accepted once)
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2) The specification of the base plate of the scaffold below 24m is (the width is greater than 200 mm, the thickness is greater than 50 mm, and the length should not be less than 2 cm), and each vertical pole must be placed in the middle of the base plate, and the base plate area shall not be less than 0.15 m2
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4) One end of the horizontal bar of single row scaffold shall be fixed on the vertical bar with right angle fastener, and the other end shall be inserted into the wall, and the insertion length shall not be less than 18cm
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It is a working platform and working channel built to ensure the safety and smooth construction of work at height
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When the scaffold board is butt laid, two horizontal bars must be set at the joint, and the external extension of the scaffold board shall be 130-150 mm, and the sum of the extension length of the two scaffold boards shall not be greater than 300 mm; when the scaffold board is overlapped, the joint must be supported on the horizontal bar, and the overlapping length shall be greater than 200 mm, and the length of the two scaffold boards extending out of the horizontal bar shall not be less than 100 mm
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Scaffolding is an essential and important facility in building construction
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2) The scaffold board of the operation layer shall be smooth, full and tightly packed, and firmly bound
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2) The first step of large and medium-sized scaffolds is after the erection of large cross bar
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Fasteners with cracks must never be used in the frame
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3) Whether the scaffold foundation and foundation are smooth
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➤ wrong example unqualified fastener unqualified fastener unqualified pole spacing is large, the setting of cross bracing is not standardized, the scaffold is not firmly rooted, resulting in the overall sinking, deformation and bending of the scaffold pole ➤ correct example 6 scaffold board ➤ acceptance content 1) after the scaffold is erected on the construction site, the scaffold board must be fully paved, and the scaffold board must be correctly butted
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3) In addition to the lap joint at the top of the top layer, butt fasteners must be used to connect the joints of other layers when the scaffold pole is lengthened
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➤ error example ➤ correct example 4 sweeping pole ➤ acceptance content 1) the sweeping pole must be connected with the vertical pole, not between the sweeping pole and the sweeping pole
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4) The scaffold bottom support must be placed in the center of the base plate
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At present, there are still many scaffold problems in the construction site of construction projects all over the country, and the hidden danger of safety is imminent
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4) The small cross bar of scaffold should be set at the intersection of the vertical bar and the large cross bar, and it must be connected with the vertical bar with right angle fasteners
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5) The width of scaffold bottom support shall not be less than 100 mm and the thickness shall not be less than 5 mm
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For scaffolds with height between 24m and 50m, the wall connecting parts should be set in two steps and three spans
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➤ error example ➤ correct example 2 drainage ditch ➤ acceptance content 1) remove and level the debris in the scaffold erection site, and make the drainage unobstructed
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7) It has been out of service for more than one month
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3) The wall connecting parts should be set close to the main node, and the distance from the main node should not be more than 300 mm
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2) The wall connecting parts shall be set from the first longitudinal horizontal bar at the bottom of the scaffold
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When it is on the operation floor, a small cross bar should be added between the two nodes to bear and transfer the load on the scaffold board
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4) Whether there is water in the scaffold foundation and foundation
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When is scaffold acceptance required? The scaffold should be accepted in the following stages: 1) after the foundation is completed, before the scaffold is erected
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The three kinds of scaffold boards can be laid by butt joint or lap joint
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1) the main body of scaffold acceptance is calculated according to the construction needs, such as the installation of ordinary scaffold, the spacing between vertical poles must be less than 2m, the spacing between vertical horizontal poles must be less than 1.8m, and the spacing between vertical horizontal poles must be less than 2m
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4) The horizontal sweeping pole should be fixed on the vertical pole close to the bottom of the longitudinal sweeping pole with right angle fastener
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2) Whether the scaffold foundation and foundation are compacted
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2) The setting distance of drainage ditch should be more than 500mm from the outermost vertical pole of scaffold
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