From news wide angle, Southeast morning post, Jinjiang economic news, construction safety technology, around 9 am on September 22, an eight storey scaffold suddenly collapsed on Jinhuai Street (diagonally opposite Quanzhou No.9 middle school), an Anhui female worker was hit and sent to hospital! (video monitoring at the moment of collapse) it is understood that the scaffold has been erected for more than two months for the construction of the external wall at the site, and the warning lines have been drawn at the intersections on both sides
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At the time of the incident, no people passed through the non motorized lane at the site
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A woman on the ground was hit by a steel pipe
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After the woman was rescued, 120 ambulances rushed to the scene to take her away from the hospital! At present, the construction party is organizing workers to dismantle the scaffold on site, and the cause of the accident is still under investigation
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At 9:30, workers wearing safety helmets were urgently dismantling the scaffold
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Safe operation specifications and precautions for the use of scaffolds: scaffolds are indispensable and important tools in construction projects
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Scaffolds are required to have sufficient area to meet the needs of workers’ operation, material stacking and transportation
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Meanwhile, they must be firm and stable to ensure no deformation, inclination and shaking under various loads and climatic conditions during construction
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1、 Common safety hazards of scaffold 1
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No special construction scheme has been prepared or approved
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2
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The setting of scaffold wall connecting parts does not meet the specification
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3
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The distance between members and the setting of cross bracing do not meet the specification
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4
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The material of scaffold board, vertical pole, longitudinal horizontal pole and transverse horizontal pole does not meet the specification
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5
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The scaffold board of construction layer is not fully paved
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6
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Before the scaffold is erected, the disclosure is not carried out, the inspection and acceptance of the scaffold section and erection is not organized, or the acceptance records are not comprehensive
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7
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The scaffold materials are stacked too much and unevenly, and the load exceeds the specification
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8
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The protective railings of passageway and unloading platform do not meet the specification
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9
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Scaffold erection personnel are not trained to work
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2、 Scaffold safety technical requirements 1
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There must be a perfect construction scheme, which shall be approved by the technical director of the enterprise
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2
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There must be perfect safety protection measures, and safety nets, protective railings and toe boards should be set up according to regulations
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3
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Operators should have escalators, ladders and ramps to ensure safety when they go up and down the shelves
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4
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There must be good anti electricity and lightning protection devices
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Steel scaffolds should be reliably grounded
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Scaffolds higher than surrounding buildings should be equipped with lightning protection devices
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5
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It is necessary to set the sweeping pole, wall connecting piece and cross bracing according to the regulations to ensure the firmness of the frame
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6
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The scaffold board shall be fully laid and stably laid, and probe board shall not be left
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Three supporting points shall be ensured and bound firmly
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7
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In the process of scaffold erection and use, it is necessary to check at any time, often remove the garbage on the scaffold, pay attention to control the load on the scaffold, and prohibit excessive stacking of materials on the scaffold and crowded operation of many people
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8
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After the resumption of the project and the weather of wind, rain and snow, the scaffold shall be inspected in detail, and the settlement, suspension, loose joint and skew of the scaffold shall be handled in time
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9
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In case of gale above level 6 or heavy fog or heavy rain, the work at height shall be suspended, and anti-skid measures shall be taken for the operation after rain and snow
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10
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The scaffold shall be inspected and accepted after erection, and it can only be used after passing the inspection and acceptance
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11
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When the scaffold is operated in multiple layers at the same time, reliable protective shed shall be set between each operation layer to prevent the upper layer falling objects from injuring the lower layer operators
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Introduction (1) the erection and construction management of fastener type steel pipe external scaffold for building construction reflects the enterprise’s characteristic external scaffold image and standardized construction ability
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This standard has compiled the internal standard for erection of external scaffold for building engineering in accordance with relevant national and local safety technical specifications
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(2) This standard specifically states the facade image, structural requirements, erection and demolition, inspection and acceptance, and management requirements of external scaffolds, and details the structural methods of some special parts, including balcony, bay window, external elevator unloading platform, elevator shaft and lighting shaft, building external corner, etc
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(3) If the specific contents of this standard do not conform to the requirements of relevant national and local safety technical specifications, the relevant national and local safety technical specifications shall prevail
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2、 The basic parameter requirements (1) the steel pipe of the outer scaffold must be antirust treated, and after rust removal, one coat of antirust paint and two coats of finish paint shall be applied
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(2) The model of wooden scaffold board is 3000 (6000) × 200 (250) × 50, and both ends are bound with Φ 1.6 mm galvanized iron wire; the steel mesh scaffold is made of hpb235 Φ 6 steel bar, with a cross section of 40 mm, and fixed on the small cross bar with Φ 1.6 mm galvanized iron wire
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3 steel pipe color (1) yellow paint: scaffold pole, big and small cross bar, vertical and horizontal sweeping pole
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(2) Red paint: wall attachment
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(3) Yellow and black two-color paint: external protective railings of scaffold, ramp protective railings and unloading platform protective railings
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(4) Red and white two-color paint: cross bracing, horizontal diagonal bracing, skirting board, stair edge guard rail, construction elevator unloading platform edge guard rail
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(5) If the color of the schematic diagram is inconsistent with that of the text description, the color of the text description shall prevail
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(1) the external protection of scaffold must be closed with qualified dense mesh safety net
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The company logo (“company” banner) and slogan shall be set on the outer shelf
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Ensure the coordination and beauty of the external shelf, and reflect the characteristics of the enterprise
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(1) four vertical poles shall be set at the internal and external corners of the scaffold body, and the large cross bar shall be connected and closed
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(2) Horizontal bar must be set at the main node
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(3) Except the top of the top layer, the vertical pole must be butted, the large cross bar can be overlapped outside the frame corner, and the cross bracing must be overlapped
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(4) The cross bracing and wall connecting parts must be erected and removed simultaneously with the external scaffold
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It is forbidden to build later or dismantle first
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6
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Pole foundation (1) the height of floor type scaffold should not exceed 35m
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Unloading measures must be taken when the height is between 35m and 50m, and unloading measures must be taken when the height is more than 50m
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The special scheme shall be demonstrated by experts
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(2) The scaffold foundation shall be flat, compacted and hardened with concrete
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The foundation shall be hardened with 100 mm thick C25 concrete, and the base or base plate shall be set at the bottom of the vertical pole
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The base plate shall be made of wood with a length of not less than 2 spans, a thickness of not less than 50 mm and a width of not less than 200 mm
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(3) Floor type scaffold must be equipped with vertical and horizontal sweeping poles
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The vertical sweeping pole should be fixed on the vertical pole close to the vertical sweeping pole with direct fasteners
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When the vertical pole foundation 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
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The height difference shall not be more than 1m, and the distance between the vertical pole axis and the slope above the slope shall not be less than 500mm
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(4) Drainage measures shall be set around the scaffold foundation
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The bottom elevation of the scaffold base shall be 50 mm higher than the outdoor natural floor
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A drainage ditch with a section of not less than 200 mm × 200 mm shall be set outside the pole foundation to ensure that there is no ponding in the scaffold foundation
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Scaffold foundation drainage ditch drawing ■ scaffold foundation section drawing ■ steel base schematic diagram 7 elevation protection (1) dense mesh safety net shall be hung on the outside of the scaffold, with mesh number no less than 2000 mesh / 100cm2
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Mesh connection shall be adopted when the net body is vertically connected, and each mesh shall be fixed with 16 # iron wire and steel pipe
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Overlapping method shall be adopted when the net body is horizontally connected, and the overlapping length shall not be less than 200 mm
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Wood brace should be set as inner lining at the corner of the frame to ensure the beauty of the safety net at the corner of the frame
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(2) 180mm toe board is set at the bottom of the scaffold from the second step, and a protective railing of the same material is set at the height of 600mm and 1200mm respectively
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If the inner side of the scaffold forms the edge, the outer side of the scaffold shall be protected.
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