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GB 55023-2022: General code for scaffold in construction
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 55023-2022 | English | 1099 |
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General code for scaffold in construction
| Valid |
GB 55023-2022
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Standard similar to GB 55023-2022 GB 55031 GB 55030 Basic data | Standard ID | GB 55023-2022 (GB55023-2022) | | Description (Translated English) | General code for scaffold in construction | | Sector / Industry | National Standard | | Word Count Estimation | 50,524 | | Date of Issue | 2022-03-10 | | Date of Implementation | 2022-10-01 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation | GB 55023-2022: General code for scaffold in construction---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to ensure the safety and applicability of construction scaffolding, this specification is formulated.
1.0.2 The selection, design, erection, use, dismantling, inspection and acceptance of construction scaffolding materials and components must comply with this specification.
1.0.3 Scaffolding should be stable and reliable. to ensure the smooth implementation and safety of project construction, the following principles should be followed.
1 Comply with national policies on resource conservation and utilization, environmental protection, disaster prevention and mitigation, and emergency management;
2.Guarantee personal, property and public safety;
3 Encourage technological innovation and management innovation of scaffolding.
1.0.4 Whether the technical methods and measures adopted in the project construction meet the requirements of this specification shall be judged by the relevant responsible parties. Among them, innovative technical methods and measures should be demonstrated and meet the performance requirements in this specification.
2 Basic regulations
2.0.1 The performance of scaffolding should meet the following requirements.
1 It should meet the design requirements of bearing capacity;
2 There should be no deformation affecting normal use;
3 It should meet the requirements for use and have safety protection functions;
4 Scaffold attached or supported on the engineering structure. It should not damage the attached engineering structure or the engineering structure supporting the scaffold.
2.0.2 Scaffolding should be designed according to the use function and environment.
2.0.3 Before the erection and dismantling of scaffolding, a special construction plan for scaffolding should be prepared according to the characteristics of the project, and it should be implemented after approval. The special construction plan for scaffolding should include the following main contents.
1 Project overview and compilation basis;
2 scaffolding type selection;
3 Types and specifications of materials, components and accessories;
4 Structural and structural design and construction drawings;
5 Structural Design Calculations;
6 Construction plan for erection and dismantling;
7 Technical requirements for erection and dismantling;
8 quality control measures;
9 security control measures;
10 Contingency plans.
2.0.4 Before the erection and dismantling of scaffolding, the special construction plan of scaffolding shall be disclosed to the management personnel and operators of the construction site for safety technology.
2.0.5 During the use of scaffolding, its structural system should not be changed.
2.0.6 When the special construction scheme of scaffolding needs to be revised, the revised scheme shall be implemented after approval.
3 Materials and components
3.0.1 The performance indicators of scaffolding materials and components should meet the needs of scaffolding use, and the quality should meet the current relevant national standards.
3.0.2 Scaffolding materials and components should have product quality certification documents.
3.0.3 The rods and structural parts used in scaffolding should be used together, and should meet the frame assembly method and structure requirements.
3.0.4 Scaffolding materials and components should be inspected, classified, maintained and maintained in time during the service period, and unqualified products should be scrapped in time and documented.
3.0.5 For materials and components whose properties cannot be determined through structural analysis, visual inspection and measurement inspection, their mechanical properties shall be determined through tests.
4 designs
4.1 General design
4.1.1 The design of the scaffold shall adopt the limit state design method based on the probability theory, and the calculation shall be carried out with the partial coefficient design expression.
4.1.2 The scaffolding structure should be designed according to the limit state of bearing capacity and the limit state of normal use.
4.1.3 Scaffold foundations shall meet the following requirements.
1 It should be flat and solid, and should meet the requirements of bearing capacity and deformation;
2 Drainage measures should be set up, and the erection site should not be waterlogged;
3 Anti-frost heaving measures shall be taken during winter construction.
4.1.4 The strength and deformation of the engineering structure supporting the scaffold and the engineering structure attached to the scaffold shall be checked and calculated. When the checking calculation cannot meet the requirements for safe bearing, corresponding reinforcement measures shall be taken according to the checking calculation results.
4.2 Loads
4.2.The loads borne by the scaffold should include permanent loads and variable loads.
4.2.2 The permanent load of the scaffold should include the following.
1 Self-weight of scaffolding structural parts;
2 self-weight of scaffolding boards, safety nets, railings and other accessories;
3 Support the self-weight of the object supported by the scaffold;
4 Other permanent loads.
4.2.3 The variable load of the scaffold should include the following.
1 construction load;
2 wind load;
3 Other variable loads.
4.2.4 The value of the variable load standard value of scaffolding shall meet the following requirements.
1 The standard value of the construction load on the working scaffold shall be determined according to the actual situation, and shall not be lower than the provisions in Table 4.2.4-1;
2 When there are two or more operation layers operating simultaneously on the scaffolding, the sum of the construction load standard values of each operation layer within the same span shall not be less than 5.0kN/m2;
3 The standard value of the construction load on the supporting scaffold shall be determined according to the actual situation, and shall not be lower than the provisions in Table 4.2.4-2;
4 The standard value of the variable load shall be calculated according to its own weight for the moving equipment, tools and other items supported on the scaffold.
4.2.5 When calculating the standard value of horizontal wind load, special scaffold structures such as high-rise tower structure and cantilever structure shall take into account the effect of wind load fluctuation increase.
4.2.6 For the dynamic load on the scaffold, the self-weight of the vibrating and impacting object should be multiplied by the dynamic coefficient 1.35 and then included in the variable load standard value.
4.2.7 When designing scaffolding, the loads should be combined according to the calculation needs of the limit state of bearing capacity and the limit state of normal service. And the most unfavorable load combination should be taken according to the loads that may appear on the scaffolding at the same time during normal erection, use or dismantling.
4.3 Structural Design
4.3.1 Scaffolding design and calculation should be carried out according to the actual construction conditions of the project, and the results should meet the requirements for scaffolding strength, stiffness and stability.
4.3.2 Scaffold structure design and calculation should be based on the construction conditions to select the most unfavorable representative rods and components, with the most unfavorable cross-section and the most unfavorable working conditions as the calculation conditions, the selection of calculation units should meet the following requirements;
1 The rods and structural parts with the largest force should be selected;
2 The rods and structural parts at the positions where the span, spacing change, geometric shape and load-bearing characteristics change shall be selected;
3 The rods and structural parts at the structural changes or weak points of the frame body should be selected;
4 When there is a concentrated load on the scaffold, the rods and components with the largest force within the concentrated load range should be selected.
4.3.3 The strength of scaffold rods and structural parts shall be calculated according to the net section; the stability and shape of the rods and structural parts shall be calculated according to the gross cross-section.
4.3.4 When the scaffolding is designed according to the limit state of the bearing capacity, the basic combination of loads and the design value of the material strength shall be used for calculation. When the scaffolding is designed according to the limit state of normal use, the standard combination of loads and the deformation limit should be used for calculation.
4.3.5 The allowable deflection of the flexural members of the scaffold shall meet the requirements in Table 4.3.5.
4.3.6 The formwork support scaffold shall be designed and calculated for the continuous support according to the construction conditions, and the number of support layers shall be determined according to the most unfavorable conditions.
4.4 Construction requirements
4.4.1 Scaffold construction measures should be reasonable, complete and complete, and should ensure that the force transmission of the frame body is clear and the force is uniform.
4.4.2 The connecting nodes of the scaffold rods should have sufficient strength and rotational rigidity, and the nodes of the frame body should not be loose during the service period.
4.4.3 The spacing and step distance of scaffold poles shall be determined by design.
4.4.4 Safety protection measures shall be taken on the scaffolding operation floor and shall comply with the following regulations.
1.Scaffolding boards should be fully spread on the working floor of working scaffolding, full-supporting scaffolding, and attached lifting scaffolding, and should meet the requirements for stability and reliability. When the distance between the edge of the working layer and the outer surface of the structure is greater than 150mm, protective measures should be taken.
2 The steel scaffold boards connected by hooks shall have self-locking devices and be locked with the horizontal bar of the working layer.
3 Wooden scaffolding, bamboo string scaffolding and bamboo bamboo scaffolding shall be supported by reliable horizontal rods and shall be bound firmly.
4 Protective railings and toe guards shall be provided on the outer edge of the scaffolding operation layer.
5 The bottom scaffolding board of the working scaffold should be closed.
6 A layer of horizontal protection shall be provided along every 3 floors of the building to be constructed or where the height is not greater than 10m. The outside of the working layer shall be closed with a safety net. When closed with a dense mesh safety net, the dense mesh safety net should meet the flame retardant requirements.
8 The part of the scaffolding protruding beyond the horizontal bar shall not be greater than.200mm.
4.4.5 The poles at the bottom of the scaffold should be provided with longitudinal and horizontal sweeping poles, and the sweeping poles should be firmly connected with the adjacent poles.
4.4.6 Working scaffolds should be provided with wall fittings according to the design calculation and construction requirements, and should meet the following requirements.
1 The wall connecting parts shall adopt rigid components that can withstand pressure and tension, and shall be firmly connected with the engineering structure and frame;
2 The horizontal distance between the wall connection point shall not exceed 3 spans, the vertical distance shall not exceed 3 steps, and the cantilever height of the frame above the wall connection point shall not exceed 2 steps;
3 At the corner of the frame body and at the end of the open-type scaffolding, additional wall fittings should be added, and the vertical distance between the wall fittings should not be greater than the building floor height, and should not be greater than 4m.
4.4.7 Vertical scissor braces shall be set on the longitudinal outer facade of the working scaffold, and shall meet the following requirements.
1.The width of each scissor brace should be 4 to 6 spans, and should not be less than 6m, nor greater than 9m; the inclination angle between the scissor brace and the horizontal plane should be between 45° and 60°;
2 When the erection height is below 24m, a pair of scissor braces should be installed at both ends, corners and in the middle of the frame body at an interval of no more than 15m, and should be continuously installed from bottom to top; when the erection height is 24m and above, it should be Continuously set from bottom to top on the entire outer facade;
3 Cantilevered scaffolding and attached elevating scaffolding shall be set continuously from bottom to top on the entire outer facade.
4.4.8 The bottom of the cantilevered scaffold pole should be reliably connected with the cantilever support structure; a longitudinal sweeping rod should be installed at the bottom of the pole, and horizontal scissor braces or horizontal diagonal braces should be set intermittently.
4.4.9 The attached lifting scaffold shall meet the following requirements.
1 The vertical main frame and horizontal supporting truss shall adopt truss or rigid frame structure, and the rods shall be connected by welding or bolts;
2 There should be anti-tilting, anti-falling, floor-stopping, load, and synchronous lifting control devices, and all kinds of devices should be sensitive and reliable;
3 A wall-attached support shall be provided on each floor covered by the vertical main frame; each wall-attached support shall be able to bear all the loads of the vertical main frame;
4 When electric lifting equipment is used, the continuous lifting distance of the electric lifting equipment should be greater than the height of one floor, and it should have braking and positioning functions.
4.4.10 Reliable structural strengthening measures shall be taken for the working scaffolds in the following parts.
1 Attached and supported at the junction of engineering structures;
2 corners of the layout;
3 The places where facilities such as tower cranes, construction hoists, and material platforms are disconnected or opened;
4 The part where the floor height is greater than the vertical height of the connecting wall parts;
5 Project structure protrusions affect the normal layout of the frame.
4.4.11 Effective hard protection measures shall be taken on the outer facade and corners of the scaffolding for street operation.
4.4.12 The height-to-width ratio of the independent frame of the supporting scaffold should not be greater than 3.0.
4.4.13 Supporting scaffolding should be provided with vertical and horizontal scissor braces, and should meet the following requirements.
1 The setting of the scissors should be uniform and symmetrical;
2 The width of each vertical scissor brace should be 6m to 9m, and the inclination angle of the scissor brace diagonal bar should be between 45° and 60°.
4.4.14 The horizontal rods supporting the scaffolding shall be arranged continuously along the longitudinal and transverse lengths according to the step distance, and shall be firmly connected with the adjacent vertical rods.
4.4.15 The length of the adjustable base of the scaffold and the adjustable support adjusting screw inserted into the scaffold pole should not be less than 150mm. And the extension length of the adjusting screw should be calculated and determined, and should meet the following requirements.
1 When the diameter of the inserted vertical rod steel pipe is 42mm, the protruding length should not be greater than.200mm;
2 When the diameter of the inserted vertical rod steel pipe is 48.3mm and above, the protruding length should not exceed 500mm.
4.4.16 The gap between the adjustable base and the adjustable support screw inserted into the steel pipe of the scaffold pole should not be greater than 2.5mm.
5 Erection, use and dismantling
5.1 Personal protection
5.1.1 There should be corresponding safety measures for setting up and dismantling scaffolding, and operators should wear personal protective equipment and non-slip shoes.
5.1.2 When erecting and dismantling scaffolding operations, safety warning lines and warning signs should be set up, and should be supervised by special personnel, and non-operating personnel are strictly prohibited from entering.
5.1.3 When erecting temporary construction power lines on scaffolding, insulation measures should be taken, and operators should wear insulating anti-skid shoes; a safe distance should be set between scaffolding and overhead transmission lines, and grounding and lightning protection facilities should be provided.
5.1.4 When erecting, using and dismantling scaffolding in a narrow space or a space with no air circulation, measures should be taken to ensure sufficient oxygen supply, and the accumulation of toxic, harmful, flammable and explosive substances should be prevented.
5.2 Set up
5.2.1 Scaffolding shall be erected in sequence and shall meet the following requirements.
1 The erection of scaffolding for landing operation and cantilevered scaffolding should be synchronized with the construction of the main structure, and the height of one erection should not exceed 2 steps of the uppermost wall connecting piece, and the free height should not be greater than 4m;
2 Reinforcing rods such as scissors braces and diagonal braces should be erected synchronously with the frame body;
3 The erection of component assembly scaffolding should extend from one end to the other end, and should be erected step by step from bottom to top; and the erection direction should be changed layer by layer;
4 After each step of the frame is erected, the vertical pole spacing, step distance, verticality and levelness of the horizontal pole should be corrected in time.
5.2.2 The installation of scaffolding and wall fittings shall meet the following requirements.
1 The installation of the wall parts should be carried out simultaneously with the erection of the scaffolding;
2 When the operation layer of the scaffolding is higher than the adjacent wall parts by 2 steps or more, temporary tie measures should be taken before the upper wall parts are installed.
5.2.3 When erecting cantilevered scaffolding and attached elevating scaffolding, the anchorage of the cantilevered support structure and attached support should be stable and reliable.
5.2.4 Protective facilities such as scaffolding safety nets and protective railings should be installed in place simultaneously with the erection of the scaffold.
5.3 use
5.3.1 The load on the working layer of the scaffold shall not exceed the design value of the load.
5.3.2 In thunderstorm weather, gale weather of level 6 and above, work on the scaffolding should be stopped; in rainy, snowy and foggy weather, the erection and dismantling of scaffolding should be stopped. Effective anti-skid measures should be taken for shelf operations after rain, snow, and frost, and snow should be removed in snowy days.
5.3.3 It is strictly forbidden to fix support scaffolds, cable wind ropes, concrete delivery pump pipes, unloading platforms and supports for large equipment on the working scaffolds. It is strictly forbidden to hang lifting equipment on the scaffolding.
5.3.4 During the use of scaffolding, it should be regularly checked and recorded, and the working status of scaffolding should meet the following requirements.
1 There should be no loss or looseness of the main force-bearing members, scissor braces and other reinforcement members and wall parts, and no obvious deformation of the frame body;
2 There should be no water accumulation on the site, and the bottom of the pole should not be loose or suspended;
3 The safety protection facilities should be complete and effective. There should be no damage or missing;
4 The support of the attached lifting scaffold should be stable, the anti-tilt, anti-fall, stop floor, load, and synchronous lifting control devices should be in good working condition, and the lifting and lowering of the frame body should be normal and stable;
5 The cantilevered support structure of the cantilevered scaffold should be stable.
5.3.5 When encountering any of the following situations, the scaffolding should be inspected and a record should be formed, and it can continue to be used after confirming its safety.
1 After bearing accidental load;
2 After encountering strong winds of level 6 and above;
3 After heavy rain and above precipitation;
4 After the frozen foundation soil is thawed;
5 Stop using for more than 1 month;
6 Partial dismantling of the frame;
7 Other special circumstances.
5.3.6 When a potential safety hazard occurs during the use of the scaffold, it should be eliminated in time; when one of the following conditions occurs, the operator should be evacuated immediately, and inspection and disposal should be organized in time.
1.The rods and connecting parts are damaged due to exceeding the material strength, or slip due to the connection node, or are not suitable for continuous bearing due to excessive deformation;
2 The structure of the scaffold part is out of balance;
3 Instability of scaffold structural members;
4 The overall tilt of the scaffolding occurs;
5 The foundation part loses the ability to carry on.
5.3.7 When the supporting scaffolding is pouring concrete and installing engineering structural parts and other loads, no one is allowed under the scaffolding.
5.3.8 When performing electric welding, gas welding and other hot work in the scaffold, the work shall be carried out after the hot work application is approved. And fire protection measures such as setting up fire buckets, configuring fire extinguishers, and removing inflammable materials should be taken, and special personnel should be assigned to monitor at the same time.
5.3.9 During the use of scaffolding, it is strictly forbidden to carry out excavation operations under and near the foundation of the scaffolding measuring rod.
5.3.10 The attached lifting scaffold shall not dismantle the anti-tilt, anti-fall, stop layer, load, and synchronous lifting control devices during use.
5.3.11 When the attached lifting scaffold is in the lifting operation or the external protective frame is in the lifting operation, no one is allowed on the frame body, and no cross operation is allowed under the frame body.
5.4 Demolition
5.4.1 Before the scaffolding is dismantled, the deposits on the working layer should be removed.
5.4.2 The dismantling of scaffolding shall comply with the following regulations.
1 The dismantling of the frame body should be carried out step by step in the order from top to bottom, and it should not be operated simultaneously from top to bottom.
2 The rods and structural parts on the same floor should be removed in the order of first outside and then inside; reinforcement rods such as scissors braces and diagonal braces should be removed when the rods at this position are disassembled.
3.The wall parts of the working scaffold should be removed layer by layer and synchronously with the frame body. The whole layer or several layers of the wall parts should not be removed first and then the frame body should be dismantled.
4 During the dismantling of scaffolding, when the height of the cantilever section of the scaffold body exceeds 2 steps, a temporary tie should be added.
5.4.3 When the scaffolding is dismantled in sections, reinforcement measures should be taken for the unremoved parts before the dismantling of the scaffolding.
5.4.4 The dismantling operation of the frame body should be organized in a unified manner, and a special person should be appointed to direct it, and cross operations are not allowed.
5.4.5 It is strictly forbidden to throw the dismantled scaffolding materials and components at high altitude.
6 Inspection and acceptance
6.0.1 The quality of materials and components for erecting scaffolding shall be inspected according to the types and specifications of the incoming batches, and they can be used only after passing the inspection.
6.0.2 On-site inspection of the quality of scaffolding materials and components and parts shall adopt the method of random sampling for appearance quality, actual measurement and actual quantity inspection.
6.0.3 Attached lifting scaffold supports, anti-tilt, anti-fall, load control devices, cantilevered scaffold cantilever structural parts and other components related to the safety of the frame body should be fully inspected.
6.0.4 During the erection of scaffolding, inspection should be carried out in the following stages, and it can be used only after passing the inspection; if it is unqualified, it should be rectified, and it can be used only after passing the rectification.
1 After the foundation is completed and before scaffolding is erected;
2 After the horizontal bars on the first floor are erected;
3.The height of each floor when the scaffolding is erected;
4 After the attached lifting scaffold support and the cantilevered scaffold structure are erected and fixed;
5 Attached lifting scaffold before each lifting, after lifting in place, and before each fall, after falling in place;
6 The external protective frame is installed for the first time, before each lifting, and after being lifted in place;
7 Set up supporting scaffolding, with a height of 2 to 4 steps or no greater than 6m.
6.0.5 After the scaffold reaches the design height or is installed in place, it shall be checked and accepted, and those that fail the acceptance shall not be used. The acceptance of scaffolding shall include the following.
1 The quality of materials and components;
2 The erection site and the fixation of supporting structural parts;
3 frame erection quality;
4 Technical materials such as special construction plan, product certificate, instruction for use, test report, inspection record, test record, etc.
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