In order to adapt to the international technical regulations and the prevailing rules of technical standards, since 2016, the Ministry of Housing and Urban Rural Development has successively issued the Opinions on Deepening the Reform of Engineering Construction Standardization and other documents, proposing the long-term goal of the government to develop mandatory standards and social organizations to develop voluntary standards, and defining the reform task of gradually replacing the scattered mandatory provisions in the current standards with full text mandatory engineering construction specifications, Gradually form a "technical regulation" system consisting of technical provisions in laws, administrative regulations, departmental rules and full text mandatory project construction specifications.
About the types of specifications. The mandatory engineering construction specification system covers all kinds of construction projects in the engineering construction field, which is divided into two types: engineering project specifications (project specifications for short) and general technical specifications (general specifications for short). The project specification takes the overall engineering construction project as the object, and takes the project's scale, layout, function, performance and key technical measures as the main content. The general specification takes the general technology of all disciplines to meet the functional performance requirements of the engineering construction project as the object, and takes the general technical requirements of survey, design, construction, maintenance, maintenance, etc. as the main content. In the full text of the mandatory project construction specification system, the project specification is the backbone, and the general specification is the provision of common and common professional key technical measures for various projects.
About the five major factor indicators. The elements in the mandatory project construction specifications are the basic provisions to ensure the systematization and efficiency improvement of urban and rural infrastructure construction, and the basic requirements to support the high-quality development of urban and rural construction. The scale requirements of the project mainly stipulate that the construction project should have a complete production or service capacity, and should adapt to the level of economic and social development. The layout requirements of the project mainly specify the industrial layout, construction project site selection, overall design, general layout and overall technical requirements in coordination with the scale. The reasonable distribution of supply capacity should be considered to improve the overall level of related facilities construction. The functional requirements of the project mainly specify the composition and purpose of the project, and define the basic constituent units of the project, which is the guarantee for the project to play its expected role. The performance requirements of the project mainly specify the construction level or technical level of the construction project, reflect the applicability of the construction project, and specify the basic level of project quality, safety, energy conservation, environmental protection, livable environment and sustainable development. The key technical measures are the basic technical provisions for realizing the functional and performance requirements of the construction project, and the basic guarantee for implementing the development goals of urban and rural construction, such as safety, green, resilience, wisdom, livability, fairness and efficiency.
About the implementation of specifications. Compulsory project construction specifications have mandatory binding force and are intended to safeguard the safety of people's lives and property, human health, project safety, ecological environment safety, public rights and interests, as well as promote the conservation and utilization of energy resources, meet the regulatory baseline requirements in economic and social management, etc. The survey, design, construction, acceptance, maintenance, maintenance, demolition and other construction activities of engineering construction projects must be strictly implemented throughout the whole process, Among them, for the existing building reconstruction project (referring to not changing the existing use function), when the conditions are not available and it is really difficult to implement the current specifications, it should not be lower than the original construction standards. The recommended engineering construction standards supporting the mandatory engineering construction specifications are mature technical measures that have been tested in practice to ensure that the requirements of the mandatory specifications are met, and should also be implemented in general. On the premise of meeting the project function, performance requirements and key technical measures specified in the mandatory project construction specifications, relevant group standards and enterprise standards can be reasonably selected to optimize or reach a higher level of project function and performance. Recommended engineering construction standards, group standards and enterprise standards shall be coordinated with the mandatory engineering construction specifications, and the technical requirements shall not be lower than the relevant technical level of the mandatory engineering construction specifications.
After the implementation of the mandatory engineering construction specifications, the mandatory provisions in the current relevant national standards and industrial standards for engineering construction shall be abolished at the same time. The mandatory provisions in the current local standards for engineering construction shall be revised in a timely manner and shall not be lower than the provisions of the mandatory engineering construction specifications. If the relevant provisions in the current project construction standards (including mandatory standards and recommended standards) are inconsistent with the provisions of the mandatory project construction specifications, the provisions of the mandatory project construction specifications shall prevail.
1 General
1.0.1 This specification is formulated to ensure the safety and applicability of construction scaffolding.
1.0.2 The selection, design, erection, use, removal, inspection and acceptance of materials and components of construction scaffolding must be in accordance with this specification.
1.0.3 The scaffold shall be stable and reliable to ensure the smooth implementation and safety of the project construction, and shall follow the following principles:
1 Comply with national policies on resource conservation, environmental protection, disaster prevention and mitigation, emergency management, etc;
2 Guarantee personal, property and public safety;
3 Encourage technological innovation and management innovation of scaffold.
1.0.4 Whether the technical methods and measures adopted in the project construction meet the requirements of this specification shall be determined by the relevant responsible subject. Among them, innovative technical methods and measures shall be demonstrated and conform to relevant performance requirements in this specification.
2 Basic regulations
2.0.1 The performance of scaffold shall meet the following requirements:
1. It shall meet the design requirements of bearing capacity;
2 No deformation affecting normal use shall occur;
3. It shall meet the use requirements and have the safety protection function;
4 The scaffold attached or supported on the engineering structure shall not damage the attached engineering structure or the engineering structure supporting the scaffold.
2.0.2 Scaffold shall be designed according to the use function and environment.
2.0.3 Scaffold shall be prepared according to project characteristics before scaffold erection and removal
The special construction scheme shall be implemented after approval. The special construction scheme for scaffold shall include the following main contents:
1 Project overview and preparation basis;
2 Scaffold type selection
3 Types and specifications of materials, components and fittings used;
4 Construction drawings of structure and structure design;
5 Structural design calculation sheet;
6 Construction plan for erection and demolition;
7 Technical requirements for erection and removal;
8 Quality control measures;
9 Safety control measures;
10 Emergency plan.
2.0.4 Before the erection and removal of scaffold, the special method statement of scaffold shall be disclosed to the management personnel and operators on the construction site.
2.0.5 During the use of scaffold, its structural system shall not be changed.
2.0.6 When the special construction scheme of scaffold needs to be modified, the modified scheme shall be implemented after approval.
3 Materials and components
3.0.1 The performance indicators of scaffold materials and components shall meet the needs of scaffold use, and the quality shall comply with the provisions of current national standards.
3.0.2 Scaffold materials, components and fittings shall have product quality certificates.
3.0.3 The bars and components used in the scaffold shall be used together, and shall meet the requirements of frame assembly method and structure.
3.0.4 Scaffold materials, components and fittings shall be inspected, classified, maintained and serviced in a timely manner within the service life. Unqualified products shall be scrapped in a timely manner and documented.
3.0.5 For materials and components whose performance cannot be determined by structural analysis, visual inspection and measurement inspection, their stress performance shall be determined by test.
4 Design
4.1 General provisions
4.1.1 The scaffold design shall adopt the limit state design method based on the probability theory, and shall be calculated by the partial coefficient design expression.
4.1.2 The scaffold structure shall be designed according to the limit state of bearing capacity and the limit state of normal use.
4.1.3 The scaffold foundation shall meet the following requirements:
1. It shall be flat and solid and meet the requirements of bearing capacity and deformation;
2 Drainage measures shall be taken to prevent water from accumulating in the erection site;
3 Anti freezing measures shall be taken for 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. If the checking calculation cannot meet the safety bearing requirements, corresponding reinforcement measures shall be taken according to the checking calculation results.
4.2 Loads
4.2.1 The load borne by the scaffold shall include permanent load and variable load.
4.2.2 The permanent load of scaffold shall include the following:
1 Self weight of scaffold structure;
2 Dead weight of scaffold board, safety net, railing and other accessories;
3 Self weight of the object supported by the supporting scaffold;
4 Other permanent loads.
4.2.3 The variable load of scaffold shall include the following:
1 Construction load;
2 Wind load;
3 Other variable loads.
4.2.4 The standard value of variable load of scaffold shall meet the following requirements:
4.3 Structural design
4.3.1 The design and calculation of the scaffold shall be carried out according to the actual construction conditions of the project, and the results shall meet the requirements for the strength, stiffness and stability of the scaffold.
4.3.2 The design and calculation of scaffold structure shall select representative
For the most unfavorable members and components, the most unfavorable section and the most unfavorable working condition shall be taken as the calculation conditions, and the selection of calculation units shall comply with the following provisions:
1 The member and component with the largest force shall be selected;
2 The members and components at the positions where the span, spacing, geometric shape and bearing characteristics change shall be selected;
3 The members and components at the structural changes or weaknesses of the frame shall be selected;
4 When there is a concentrated load on the scaffold, the bars and components with the largest force within the scope of concentrated load shall also be selected.
4.3.3 The strength of scaffold bars and components shall be calculated according to the net section; The stability and deformation of members and fittings shall be calculated as per gross section.
4.3.4 When the scaffold is designed according to the limit state of bearing capacity, the basic load combination and design value of material strength shall be used for calculation. When the scaffold is designed according to the normal service limit state, the load standard combination and deformation limit shall be used for calculation.
4.3.5 The allowable deflection of bending members of scaffold shall comply with the provisions in Table 4.3.5.
4.4 Structural requirements
4.4.1 Scaffold construction measures shall be reasonable, complete and complete, and shall ensure clear force transmission and uniform force bearing of the scaffold.
4.4.2 The connecting nodes of scaffold bars shall have sufficient strength and rotational stiffness, and the nodes of the frame shall not be loose during the service life.
4.4.3 The spacing and step distance of scaffold upright shall be determined by design.
4.4.4 Safety protection measures shall be taken for scaffold operation layer, and the following provisions shall be met:
1 The operation layer of operation scaffold, full support scaffold and attached lifting scaffold shall be fully paved with scaffold boards and meet the requirements of stability and reliability. When the distance between the edge of the working layer and the external surface of the structure is more than 150 mm, protective measures shall be taken.
2 The steel scaffold board connected by hooks shall be equipped with self-locking devices and locked with the horizontal bar of the working floor.
3 The wooden scaffold board, bamboo scaffold board and bamboo scaffold board shall be supported by reliable horizontal bar, and shall be bound firmly.
4 Protective railings and toe boards shall be set at the outer edge of the scaffold operation layer.
5 The scaffold board at the bottom of the operation scaffold shall be sealed.
6 Horizontal protection shall be provided every three floors or at the height of no more than 10m along the building under construction.
7 The outside of the operation layer shall be closed with safety net. When closed with dense mesh safety net, the dense mesh safety net shall meet the flame retardant requirements.
8 The part of scaffold board extending beyond the horizontal bar shall not be more than 200mm.
4.4.5 The vertical poles at the bottom of the scaffold shall be set with longitudinal and transverse bottom sweeping poles, which shall be firmly connected with adjacent vertical poles.
4.4.6 The working scaffold shall be equipped with wall connecting pieces according to the design calculation and structural requirements, and shall meet the following requirements:
1. The fasteners to the wall shall be rigid members that can bear the pressure and tension, and shall be firmly connected with the engineering structure and the frame;
5 Erection, use and removal
5.1. Personal protection
5.1.1 Corresponding safety measures shall be taken for scaffold erection and dismantling. Operators shall wear personal protective equipment and anti-skid shoes.
5.1.2 When erecting and dismantling scaffolds, safety warning lines and warning signs shall be set up, and special personnel shall be assigned for supervision. Non operators are strictly prohibited.
5.1.3 When erecting temporary construction power lines on the scaffold, insulation measures should be taken, and operators should wear insulating anti-skid shoes; Safe distance shall be set between scaffold and overhead power transmission line, and grounding and lightning protection facilities shall be set.
5.1.4 When erecting, using and dismantling scaffolds in a narrow space or an air tight space, measures shall be taken to ensure adequate oxygen supply and prevent the accumulation of toxic, harmful, flammable and explosive substances.
5.2 Erection
5.2.1 Scaffolds shall be erected in sequence and comply with the following requirements:
1. The erection of ground operation scaffold and cantilever scaffold shall be synchronized with the construction of the main structure project. The height of the secondary erection shall not exceed two steps of the uppermost connecting wall piece, and the free height shall not exceed 4m
2 The diagonal bracing, diagonal bracing and other reinforcement bars shall be erected synchronously with the frame;
3 The erection of component assembly scaffold shall extend from one end to the other end, and shall be erected step by step from bottom to top; The erection direction shall be changed layer by layer;
4 After the erection of the frame, the spacing, step distance, perpendicularity and levelness of the horizontal bar shall be corrected in time.
5.2.2 The installation of wall connecting parts of operation scaffold shall meet the following requirements:
1. The installation of wall connecting parts shall be carried out simultaneously with the erection of operation scaffold;
6 Inspection and acceptance
Attachment: drafting instructions
Foreword 1 General 2 Basic regulations 2 Scaffold type selection 3 Materials and components 4 Design 4 Other permanent loads. 5 Erection, use and removal 6 Inspection and acceptance Attachment: drafting instructions
Standard
GB 55023-2022 General specification for construction scaffolding (English Version)
Standard No.
GB 55023-2022
Status
valid
Language
English
File Format
PDF
Word Count
8500 words
Price(USD)
255.0
Implemented on
2022-10-1
Delivery
via email in 1~3 business day
Detail of GB 55023-2022
Standard No.
GB 55023-2022
English Name
General specification for construction scaffolding
Foreword
In order to adapt to the international technical regulations and the prevailing rules of technical standards, since 2016, the Ministry of Housing and Urban Rural Development has successively issued the Opinions on Deepening the Reform of Engineering Construction Standardization and other documents, proposing the long-term goal of the government to develop mandatory standards and social organizations to develop voluntary standards, and defining the reform task of gradually replacing the scattered mandatory provisions in the current standards with full text mandatory engineering construction specifications, Gradually form a "technical regulation" system consisting of technical provisions in laws, administrative regulations, departmental rules and full text mandatory project construction specifications.
About the types of specifications. The mandatory engineering construction specification system covers all kinds of construction projects in the engineering construction field, which is divided into two types: engineering project specifications (project specifications for short) and general technical specifications (general specifications for short). The project specification takes the overall engineering construction project as the object, and takes the project's scale, layout, function, performance and key technical measures as the main content. The general specification takes the general technology of all disciplines to meet the functional performance requirements of the engineering construction project as the object, and takes the general technical requirements of survey, design, construction, maintenance, maintenance, etc. as the main content. In the full text of the mandatory project construction specification system, the project specification is the backbone, and the general specification is the provision of common and common professional key technical measures for various projects.
About the five major factor indicators. The elements in the mandatory project construction specifications are the basic provisions to ensure the systematization and efficiency improvement of urban and rural infrastructure construction, and the basic requirements to support the high-quality development of urban and rural construction. The scale requirements of the project mainly stipulate that the construction project should have a complete production or service capacity, and should adapt to the level of economic and social development. The layout requirements of the project mainly specify the industrial layout, construction project site selection, overall design, general layout and overall technical requirements in coordination with the scale. The reasonable distribution of supply capacity should be considered to improve the overall level of related facilities construction. The functional requirements of the project mainly specify the composition and purpose of the project, and define the basic constituent units of the project, which is the guarantee for the project to play its expected role. The performance requirements of the project mainly specify the construction level or technical level of the construction project, reflect the applicability of the construction project, and specify the basic level of project quality, safety, energy conservation, environmental protection, livable environment and sustainable development. The key technical measures are the basic technical provisions for realizing the functional and performance requirements of the construction project, and the basic guarantee for implementing the development goals of urban and rural construction, such as safety, green, resilience, wisdom, livability, fairness and efficiency.
About the implementation of specifications. Compulsory project construction specifications have mandatory binding force and are intended to safeguard the safety of people's lives and property, human health, project safety, ecological environment safety, public rights and interests, as well as promote the conservation and utilization of energy resources, meet the regulatory baseline requirements in economic and social management, etc. The survey, design, construction, acceptance, maintenance, maintenance, demolition and other construction activities of engineering construction projects must be strictly implemented throughout the whole process, Among them, for the existing building reconstruction project (referring to not changing the existing use function), when the conditions are not available and it is really difficult to implement the current specifications, it should not be lower than the original construction standards. The recommended engineering construction standards supporting the mandatory engineering construction specifications are mature technical measures that have been tested in practice to ensure that the requirements of the mandatory specifications are met, and should also be implemented in general. On the premise of meeting the project function, performance requirements and key technical measures specified in the mandatory project construction specifications, relevant group standards and enterprise standards can be reasonably selected to optimize or reach a higher level of project function and performance. Recommended engineering construction standards, group standards and enterprise standards shall be coordinated with the mandatory engineering construction specifications, and the technical requirements shall not be lower than the relevant technical level of the mandatory engineering construction specifications.
After the implementation of the mandatory engineering construction specifications, the mandatory provisions in the current relevant national standards and industrial standards for engineering construction shall be abolished at the same time. The mandatory provisions in the current local standards for engineering construction shall be revised in a timely manner and shall not be lower than the provisions of the mandatory engineering construction specifications. If the relevant provisions in the current project construction standards (including mandatory standards and recommended standards) are inconsistent with the provisions of the mandatory project construction specifications, the provisions of the mandatory project construction specifications shall prevail.
1 General
1.0.1 This specification is formulated to ensure the safety and applicability of construction scaffolding.
1.0.2 The selection, design, erection, use, removal, inspection and acceptance of materials and components of construction scaffolding must be in accordance with this specification.
1.0.3 The scaffold shall be stable and reliable to ensure the smooth implementation and safety of the project construction, and shall follow the following principles:
1 Comply with national policies on resource conservation, environmental protection, disaster prevention and mitigation, emergency management, etc;
2 Guarantee personal, property and public safety;
3 Encourage technological innovation and management innovation of scaffold.
1.0.4 Whether the technical methods and measures adopted in the project construction meet the requirements of this specification shall be determined by the relevant responsible subject. Among them, innovative technical methods and measures shall be demonstrated and conform to relevant performance requirements in this specification.
2 Basic regulations
2.0.1 The performance of scaffold shall meet the following requirements:
1. It shall meet the design requirements of bearing capacity;
2 No deformation affecting normal use shall occur;
3. It shall meet the use requirements and have the safety protection function;
4 The scaffold attached or supported on the engineering structure shall not damage the attached engineering structure or the engineering structure supporting the scaffold.
2.0.2 Scaffold shall be designed according to the use function and environment.
2.0.3 Scaffold shall be prepared according to project characteristics before scaffold erection and removal
The special construction scheme shall be implemented after approval. The special construction scheme for scaffold shall include the following main contents:
1 Project overview and preparation basis;
2 Scaffold type selection
3 Types and specifications of materials, components and fittings used;
4 Construction drawings of structure and structure design;
5 Structural design calculation sheet;
6 Construction plan for erection and demolition;
7 Technical requirements for erection and removal;
8 Quality control measures;
9 Safety control measures;
10 Emergency plan.
2.0.4 Before the erection and removal of scaffold, the special method statement of scaffold shall be disclosed to the management personnel and operators on the construction site.
2.0.5 During the use of scaffold, its structural system shall not be changed.
2.0.6 When the special construction scheme of scaffold needs to be modified, the modified scheme shall be implemented after approval.
3 Materials and components
3.0.1 The performance indicators of scaffold materials and components shall meet the needs of scaffold use, and the quality shall comply with the provisions of current national standards.
3.0.2 Scaffold materials, components and fittings shall have product quality certificates.
3.0.3 The bars and components used in the scaffold shall be used together, and shall meet the requirements of frame assembly method and structure.
3.0.4 Scaffold materials, components and fittings shall be inspected, classified, maintained and serviced in a timely manner within the service life. Unqualified products shall be scrapped in a timely manner and documented.
3.0.5 For materials and components whose performance cannot be determined by structural analysis, visual inspection and measurement inspection, their stress performance shall be determined by test.
4 Design
4.1 General provisions
4.1.1 The scaffold design shall adopt the limit state design method based on the probability theory, and shall be calculated by the partial coefficient design expression.
4.1.2 The scaffold structure shall be designed according to the limit state of bearing capacity and the limit state of normal use.
4.1.3 The scaffold foundation shall meet the following requirements:
1. It shall be flat and solid and meet the requirements of bearing capacity and deformation;
2 Drainage measures shall be taken to prevent water from accumulating in the erection site;
3 Anti freezing measures shall be taken for 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. If the checking calculation cannot meet the safety bearing requirements, corresponding reinforcement measures shall be taken according to the checking calculation results.
4.2 Loads
4.2.1 The load borne by the scaffold shall include permanent load and variable load.
4.2.2 The permanent load of scaffold shall include the following:
1 Self weight of scaffold structure;
2 Dead weight of scaffold board, safety net, railing and other accessories;
3 Self weight of the object supported by the supporting scaffold;
4 Other permanent loads.
4.2.3 The variable load of scaffold shall include the following:
1 Construction load;
2 Wind load;
3 Other variable loads.
4.2.4 The standard value of variable load of scaffold shall meet the following requirements:
4.3 Structural design
4.3.1 The design and calculation of the scaffold shall be carried out according to the actual construction conditions of the project, and the results shall meet the requirements for the strength, stiffness and stability of the scaffold.
4.3.2 The design and calculation of scaffold structure shall select representative
For the most unfavorable members and components, the most unfavorable section and the most unfavorable working condition shall be taken as the calculation conditions, and the selection of calculation units shall comply with the following provisions:
1 The member and component with the largest force shall be selected;
2 The members and components at the positions where the span, spacing, geometric shape and bearing characteristics change shall be selected;
3 The members and components at the structural changes or weaknesses of the frame shall be selected;
4 When there is a concentrated load on the scaffold, the bars and components with the largest force within the scope of concentrated load shall also be selected.
4.3.3 The strength of scaffold bars and components shall be calculated according to the net section; The stability and deformation of members and fittings shall be calculated as per gross section.
4.3.4 When the scaffold is designed according to the limit state of bearing capacity, the basic load combination and design value of material strength shall be used for calculation. When the scaffold is designed according to the normal service limit state, the load standard combination and deformation limit shall be used for calculation.
4.3.5 The allowable deflection of bending members of scaffold shall comply with the provisions in Table 4.3.5.
4.4 Structural requirements
4.4.1 Scaffold construction measures shall be reasonable, complete and complete, and shall ensure clear force transmission and uniform force bearing of the scaffold.
4.4.2 The connecting nodes of scaffold bars shall have sufficient strength and rotational stiffness, and the nodes of the frame shall not be loose during the service life.
4.4.3 The spacing and step distance of scaffold upright shall be determined by design.
4.4.4 Safety protection measures shall be taken for scaffold operation layer, and the following provisions shall be met:
1 The operation layer of operation scaffold, full support scaffold and attached lifting scaffold shall be fully paved with scaffold boards and meet the requirements of stability and reliability. When the distance between the edge of the working layer and the external surface of the structure is more than 150 mm, protective measures shall be taken.
2 The steel scaffold board connected by hooks shall be equipped with self-locking devices and locked with the horizontal bar of the working floor.
3 The wooden scaffold board, bamboo scaffold board and bamboo scaffold board shall be supported by reliable horizontal bar, and shall be bound firmly.
4 Protective railings and toe boards shall be set at the outer edge of the scaffold operation layer.
5 The scaffold board at the bottom of the operation scaffold shall be sealed.
6 Horizontal protection shall be provided every three floors or at the height of no more than 10m along the building under construction.
7 The outside of the operation layer shall be closed with safety net. When closed with dense mesh safety net, the dense mesh safety net shall meet the flame retardant requirements.
8 The part of scaffold board extending beyond the horizontal bar shall not be more than 200mm.
4.4.5 The vertical poles at the bottom of the scaffold shall be set with longitudinal and transverse bottom sweeping poles, which shall be firmly connected with adjacent vertical poles.
4.4.6 The working scaffold shall be equipped with wall connecting pieces according to the design calculation and structural requirements, and shall meet the following requirements:
1. The fasteners to the wall shall be rigid members that can bear the pressure and tension, and shall be firmly connected with the engineering structure and the frame;
5 Erection, use and removal
5.1. Personal protection
5.1.1 Corresponding safety measures shall be taken for scaffold erection and dismantling. Operators shall wear personal protective equipment and anti-skid shoes.
5.1.2 When erecting and dismantling scaffolds, safety warning lines and warning signs shall be set up, and special personnel shall be assigned for supervision. Non operators are strictly prohibited.
5.1.3 When erecting temporary construction power lines on the scaffold, insulation measures should be taken, and operators should wear insulating anti-skid shoes; Safe distance shall be set between scaffold and overhead power transmission line, and grounding and lightning protection facilities shall be set.
5.1.4 When erecting, using and dismantling scaffolds in a narrow space or an air tight space, measures shall be taken to ensure adequate oxygen supply and prevent the accumulation of toxic, harmful, flammable and explosive substances.
5.2 Erection
5.2.1 Scaffolds shall be erected in sequence and comply with the following requirements:
1. The erection of ground operation scaffold and cantilever scaffold shall be synchronized with the construction of the main structure project. The height of the secondary erection shall not exceed two steps of the uppermost connecting wall piece, and the free height shall not exceed 4m
2 The diagonal bracing, diagonal bracing and other reinforcement bars shall be erected synchronously with the frame;
3 The erection of component assembly scaffold shall extend from one end to the other end, and shall be erected step by step from bottom to top; The erection direction shall be changed layer by layer;
4 After the erection of the frame, the spacing, step distance, perpendicularity and levelness of the horizontal bar shall be corrected in time.
5.2.2 The installation of wall connecting parts of operation scaffold shall meet the following requirements:
1. The installation of wall connecting parts shall be carried out simultaneously with the erection of operation scaffold;
6 Inspection and acceptance
Attachment: drafting instructions
Contents of GB 55023-2022
Foreword
1 General
2 Basic regulations
2 Scaffold type selection
3 Materials and components
4 Design
4 Other permanent loads.
5 Erection, use and removal
6 Inspection and acceptance
Attachment: drafting instructions