GB 50204-1992 Code for construction and acceptance of concrete structure engineering
Some standard content:
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National Standard of the People's Republic of China
GB50204—92
Concrete Structure Engineering Construction and Acceptance Code
1992—09-25 Issued
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
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1993—05—01 Implementation
Jointly Issued
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National Standard of the People's Republic of China
Concrete Structure Engineering Construction and Acceptance Code GB
50204— 92
Editor Department: Former Ministry of Urban and Rural Construction and Environmental Protection of the People's Republic of China Approval Department: Ministry of Construction of the People's Republic of China
Effective Date: 1
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Notice on the Release of the National Standard "Concrete Structure Engineering Construction and Acceptance Code"
Jianbiao [1992] No. 651
According to the requirements of the State Planning Commission's Jizong [1987] No. 2390 and the Ministry of Construction's Jianbiao [1991] No. 727, the "Concrete Structure Engineering Construction and Acceptance Code" revised by the China Academy of Building Research and relevant units has been reviewed by relevant departments. The "Concrete Structure Engineering Construction and Acceptance Code" GB50204-92 is now approved as a mandatory national standard. It will be implemented on May 1, 1993. The original "Reinforced Concrete Engineering Construction and Acceptance Code" GBJ204-83 will be abolished at the same time. This standard is managed by the Ministry of Construction. The China Academy of Building Research is responsible for the specific interpretation and other work, and the Ministry of Construction's Standard and Quota Research Institute is responsible for the publication and distribution. September 25, 1992
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Revision Notes
This standard is revised by the China Academy of Building Research in conjunction with relevant units based on the requirements of the State Planning Commission's Document No. 2390 [1987] and the Ministry of Construction's Document No. 727 [1991], and is revised from the "Concrete Construction and Acceptance Code" GBJ204-83.
During the revision process of this standard, the revision group summarized the domestic engineering practice experience in recent years, combined with the revision of the "Concrete Structure Design Code" GBJ10-89, and proposed a revised draft, renamed it "Concrete Structure Construction and Acceptance Code", and widely solicited opinions from relevant units across the country. After repeated revisions, it was finally reviewed and finalized by our ministry in conjunction with relevant departments.
This code consists of eight chapters and five appendices. The main contents of this revision are: in accordance with the provisions of GBJ83-85 "General Symbols, Units of Measurement and Basic Terms for Building Structure Design", the relevant symbols, units of measurement and basic terms have been revised, a new concrete strength grading method has been adopted, and the concrete design number has been replaced by the concrete strength grade. The determination principle of the construction mix strength of concrete and the method of concrete strength inspection and evaluation have been revised accordingly, and the contents of premixed concrete, mass concrete and unbonded prestressed concrete structure construction have been added. The minimum lap length of steel bar welding joints and binding joints and the minimum concrete protective layer thickness have been adjusted; the requirements related to earthquake resistance and the performance requirements and inspection of prestressed anchor clamp connectors have been supplemented, the calculation formula of the template side pressure and the provisions on the allowable deviation of construction have been revised; the contents of thermal engineering calculation of concrete thermal storage curing have been added; some inapplicable provisions and appendices in the original code have been deleted.
In the process of implementing this specification, all units should combine the actual project, pay attention to summarizing experience and accumulating data, and send any problems and opinions found to the Structural Institute of China Academy of Building Research at any time for reference in future revisions. Ministry of Construction
July 1992
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Main Symbols
Chapter 1 General Provisions
Chapter 2 Formwork Engineering
Section 1
General Provisions
Section 2 Formwork Design
Section 3 Formwork Installation
Section 4||tt ||Template removal
Chapter 3 Steel bar engineering
Section 1
Section 2
Section 3
Section 4
Section 5
Chapter 4
General provisions
Cold drawing and cold drawing of steel bars·
Steel bar processing·
Steel bar welding
Steel bar binding and installation
Concrete engineering
Section 1
Section Section 2
Section 3
Section 4
Section 5
Section 6
General Provisions…
Concrete mix proportion
Concrete mixing
Concrete transportation and pouring
Concrete natural curing
Concrete quality inspection
Section 7 Concrete defect repair
Chapter 5 Prefabricated concrete structure engineering
Section 1 Components Production·
Section 2 Component Transportation and Stacking
Section 3 Component Installation·
Chapter 6 Prestressed Concrete Engineering·
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Section 1 Prestressed Reinforcement Production
Section 2
Section 3
Section 4
Section 5
Section 6
Chapter 7| |tt||Anchors, clamps and connectors for prestressed tendons
Applying prestressing force·
Prestressing method
Post-stressing method
Unbonded prestressing
Construction in winter
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Chapter 8
Appendix 1
Appendix 2||tt| |Appendix 3
Appendix 4
Appendix 5
General provisions
Rebar cold drawing, tensioning and welding
Concrete mixing and mixing
Concrete transportation and pouring
Concrete curing
Concrete quality inspection·
Project acceptance
Ordinary formwork and its support load standard value and partial coefficient Temperature and age influence curve on concrete strength Thermal calculation for winter construction
Commonly used construction record forms
Explanation of terms used in this specification
Additional explanation
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Main symbols
L, ()——length;
H——total height of structure;
d—steel bar diameter;
D——bending diameter;
- Concrete construction mix strength;
——designed concrete strength standard value;
Bapa,tot
Standard deviation of concrete strength;
Anchor efficiency coefficient;
——Efficiency coefficient of prestressed tendons;
Total strain when the assembly breaks;
A,——Cross-sectional area of prestressed tendons;
Tension control stress of prestressed tendons,
——Elastic modulus of steel bars.
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Chapter 1 General
Article 1.0.1 This specification is specially formulated to achieve advanced technology, economic rationality and ensure quality in the construction and acceptance of concrete structure engineering. Article 1.0.2 This specification applies to the construction and acceptance of concrete structure engineering for industrial and civil buildings and general structures. It is not applicable to the construction and acceptance of special concrete or concrete structure projects with special requirements. Article 1.0.3 The main quality requirements in this specification are formulated in accordance with the principles of the current national standard "Concrete Structure Design Code" and other relevant specifications; symbols, measurement units and basic terms are adopted in accordance with the current national standard "General Symbols, Measurement Units and Basic Terms for Building Structure Design". Article 1.0.Article 4 The construction of concrete structure engineering shall be carried out in accordance with the requirements of the design drawings. The quality requirements and test methods for raw materials, semi-finished products and finished products shall be implemented in accordance with the provisions of this specification; those not specified in this specification shall be implemented in accordance with the provisions of the current relevant national standards and specifications.
The construction of each section or sub-project of the concrete structure shall be carried out after the previous section or sub-project has been inspected and qualified. The division of sections and sub-projects shall be carried out in accordance with the provisions of the current national standard "Standards for Inspection and Evaluation of Building Installation Engineering Quality". Article 1.0.5 The safety technology, labor protection, fire prevention measures, etc. during the construction of concrete structure engineering must comply with the relevant special regulations. Engineering Construction Standard Full Text Information System
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Chapter II Formwork Engineering
Section 1 General Provisions
Article 2.1.1 The materials of the formwork should be steel, plywood, plastic, etc., and the materials of the formwork support should be steel, etc. The materials of the materials should comply with the relevant special regulations.
When using wood, the tree species can be selected according to the actual situation of each region, and the material should not be lower than grade III.
Article 2.1.2 The formwork and its support must meet the following requirements: 1. Ensure the correct shape, size and relative position of each part of the engineering structure and components;
, have sufficient bearing capacity, rigidity and stability, and can reliably withstand the deadweight and lateral pressure of the newly poured concrete, as well as the load generated during the construction process; 3. Simple structure, easy assembly and disassembly, and convenient for the binding, installation of steel bars and the pouring and maintenance of concrete;
4. The joints of the formwork should not leak grout. bZxz.net
Article 2.1.3 The design, production and construction of combined steel formwork, large formwork, sliding formwork, etc. shall comply with the relevant provisions of the current national standards "Technical Specifications for Combined Steel Formwork", "Design and Construction Regulations for Large Formwork Multi-storey Residential Structures" and "Technical Specifications for Hydraulic Sliding Formwork Construction".
Article 2.1.4 The contact surface between the formwork and the concrete should be coated with an isolation agent. It is not advisable to use isolating agents that affect the structure or hinder the construction of decorative projects, such as oily ones. It is strictly forbidden to stain the joints between steel bars and concrete with isolating agents.
Article 2.1.5 The formwork and its brackets should be regularly maintained. Steel formwork and steel brackets should be prevented from rusting.
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Section 2 Formwork Design
Article 2.2.1 The design of the formwork and its brackets should be carried out according to the conditions such as the engineering structure form, load size, foundation soil type, construction equipment and material supply. Article 2.2.2 The design of steel formwork and its brackets shall comply with the provisions of the current national standard "Steel Structure Design Code", and its cross-section plastic development coefficient shall be 1.0; its load design value can be reduced by multiplying it by a coefficient of 0.85. The use of cold-bent thin-walled steel shall comply with the provisions of the current national standard "Cold-bent Thin-walled Steel Structure Technical Code", and its load design value shall not be reduced.
The design of wooden formwork and its support shall comply with the provisions of the current national standard "Wood Structure Design Code": When the moisture content of wood is less than 25%, its load design value can be reduced by multiplying the coefficient of 0.90.
The design of formwork and its support of other materials shall comply with the relevant special regulations. Article 2.2.3 The design of formwork and its support shall consider the following loads: 1. The dead weight of the formwork and its support;
2. The dead weight of the newly poured concrete;
3. The dead weight of the steel bars;
4. The loads of construction personnel and construction equipment,
5. The load generated when vibrating concrete;
6. The pressure of the newly poured concrete on the side of the formwork; 7. The load generated when pouring concrete.
The various loads participating in the combination of the load effects of the formwork and its support shall comply with the provisions of Table 2.2.3, and the combination of load effects shall comply with the provisions of relevant standards. The standard values of loads and partial coefficients can be adopted according to Appendix 1 of this code. Engineering Construction Standards Full-text Information System
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Types of various loads involved in the combination of load effects of formwork and its supports
Formwork and supports for flat plates and thin shells
Bottom plates and supports for beam and arch formwork
Side formwork for beams, arches, columns (side length ≤300mm), walls (thickness ≤100mm)
Side of large-volume structures, columns (side length>300mm), walls (thickness>100mm)
Load items involved in the combination
Calculation Bearing capacity
1,2,3,4
1,2,3,5
Verify stiffness
1,2,3
Article 2.2.4 When verifying the stiffness of the formwork and its support, its maximum deformation value shall not exceed the following allowable values:
1. For the formwork exposed on the surface of the structure, it is 1/400 of the calculated span of the formwork member; 2. For the formwork hidden on the surface of the structure, it is 1/250 of the calculated span of the formwork member; 3. The compression deformation value or elastic deflection of the support is 1/1000 of the corresponding calculated span of the structure.
Article 2.2.5 The columns or trusses of the support shall remain stable and be fixed with bracing rods.
When verifying the anti-toppling stability of the formwork and its support under the action of deadweight and wind loads, the relevant special regulations shall be met. Section 3 Formwork Installation
Article 2.3.1 The supporting parts of vertical formwork and brackets should be equipped with pads when installed on the base soil, and the base soil must be solid and have drainage measures. For collapsible loess, waterproofing measures must be taken; for frost-heaving soil, anti-freeze-thaw measures must be taken. Article 2.3.2 During the installation of the formwork and its bracket, temporary fixing facilities must be set to prevent overturning.
Article 2.3.3 For cast-in-place reinforced concrete beams and slabs, when the span is equal to or greater than 4m, the formwork should be arched; when there is no specific requirement in the design, the arch height should be 1/1000~3/1000 of the full span length.
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Article 2.3.4 For cast-in-place multi-storey houses and structures, the method of layered and segmented formwork shall be adopted, and the installation of the upper formwork and its bracket shall comply with the following provisions: 1. The lower floor slab shall have the bearing capacity to bear the upper load or additional bracket support;
2. The columns of the upper bracket shall be aligned with the columns of the lower bracket, and pads shall be laid; 3. When the suspended formwork and truss formwork method are adopted, the bearing capacity and rigidity of the supporting structure must meet the requirements.
Article 2.3.5 When the inter-layer height is greater than 5m, truss formwork or multi-layer bracket formwork should be selected.
When multi-layer bracket formwork is adopted, the horizontal pad of the bracket shall be flat, the pillars shall be vertical, and the upper and lower pillars shall be on the same vertical center line. Article 2.3.6 When adopting segmented demoulding, the support point of the bottom mold should be set according to the template design, and each section of the template should be on the same plane, and the height difference should not exceed 3mm. Article 2.3.7 When the load-bearing welded steel frame and the template are installed together, the following provisions shall be met:
1. The template must be fixed on the node of the load-bearing welded steel frame; 2. When installing the steel bar template assembly, the sling should be tied according to the design of the template hanging point position.
Article 2.3.8 The embedded parts and reserved holes fixed on the template shall not be omitted, and the installation must be firm and accurate in position. The allowable deviation shall comply with the provisions of Table 2.3.8. Allowable deviation of embedded parts and reserved holes (mm) Items
Centerline position of embedded steel plate
Centerline position of embedded pipe and reserved hole
Embedded bolt
Reserved hole
Centerline position
Exposed length
Centerline position
Internal dimensions of section
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Allowable deviation
W.bzsoso.coIArticle 2 The formwork and its support must meet the following requirements: 1. Ensure the correct shape, size and relative position of each part of the engineering structure and components,
, have sufficient bearing capacity, rigidity and stability, and can reliably withstand the deadweight and lateral pressure of the newly poured concrete, as well as the load generated during the construction process; 3. Simple structure, easy assembly and disassembly, and convenient for the binding, installation of steel bars and the pouring and maintenance of concrete;
4. The joints of the formwork should not leak grout.
Article 2.1.3 The design, production and construction of combined steel formwork, large formwork, sliding formwork, etc. shall comply with the relevant provisions of the current national standards "Technical Specifications for Combined Steel Formwork", "Design and Construction Regulations for Multi-storey Residential Structures with Large Formwork" and "Technical Specifications for Construction of Hydraulic Sliding Formwork".
Article 2.1.4 The contact surface between the formwork and concrete shall be coated with an isolation agent. Isolation agents that affect the structure or hinder the construction of decorative projects such as oil-based ones should not be used. It is strictly forbidden to contaminate the joints between steel bars and concrete with isolation agents.
Article 2.1.5 The formwork and its support should be regularly maintained. Steel formwork and steel support should be prevented from rusting.
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Section 2 Formwork Design
Article 2.2.1 The design of the formwork and its support should be carried out according to the conditions such as the engineering structure form, load size, foundation soil type, construction equipment and material supply. Article 2.2.2 The design of steel formwork and its support should comply with the provisions of the current national standard "Steel Structure Design Code", and its cross-section plastic development coefficient shall be 1.0; its load design value can be multiplied by the coefficient of 0.85 for reduction. The use of cold-bent thin-walled steel should comply with the provisions of the current national standard "Cold-bent Thin-walled Steel Structure Technical Code", and its load design value should not be reduced.
The design of wooden formwork and its support shall comply with the provisions of the current national standard "Wood Structure Design Code": When the moisture content of wood is less than 25%, its load design value can be reduced by multiplying the coefficient of 0.90.
The design of formwork and its support of other materials shall comply with the relevant special regulations. Article 2.2.3 The design of formwork and its support shall consider the following loads: 1. The dead weight of the formwork and its support;
2. The dead weight of the newly poured concrete;
3. The dead weight of the steel bars;
4. The loads of construction personnel and construction equipment,
5. The load generated when vibrating concrete;
6. The pressure of the newly poured concrete on the side of the formwork; 7. The load generated when pouring concrete.
The various loads participating in the combination of the load effects of the formwork and its support shall comply with the provisions of Table 2.2.3, and the combination of load effects shall comply with the provisions of relevant standards. The standard values of loads and partial coefficients can be adopted according to Appendix 1 of this code. Engineering Construction Standards Full-text Information System
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Types of various loads involved in the combination of load effects of formwork and its supports
Formwork and supports for flat plates and thin shells
Bottom plates and supports for beam and arch formwork
Side formwork for beams, arches, columns (side length ≤300mm), walls (thickness ≤100mm)
Side of large-volume structures, columns (side length>300mm), walls (thickness>100mm)
Load items involved in the combination
Calculation Bearing capacity
1,2,3,4
1,2,3,5
Verify stiffness
1,2,3
Article 2.2.4 When verifying the stiffness of the formwork and its support, its maximum deformation value shall not exceed the following allowable values:
1. For the formwork exposed on the surface of the structure, it is 1/400 of the calculated span of the formwork member; 2. For the formwork hidden on the surface of the structure, it is 1/250 of the calculated span of the formwork member; 3. The compression deformation value or elastic deflection of the support is 1/1000 of the corresponding calculated span of the structure.
Article 2.2.5 The columns or trusses of the support shall remain stable and be fixed with bracing rods.
When verifying the anti-toppling stability of the formwork and its support under the action of deadweight and wind loads, the relevant special regulations shall be met. Section 3 Formwork Installation
Article 2.3.1 The supporting parts of vertical formwork and brackets should be equipped with pads when installed on the base soil, and the base soil must be solid and have drainage measures. For collapsible loess, waterproofing measures must be taken; for frost-heaving soil, anti-freeze-thaw measures must be taken. Article 2.3.2 During the installation of the formwork and its bracket, temporary fixing facilities must be set to prevent overturning.
Article 2.3.3 For cast-in-place reinforced concrete beams and slabs, when the span is equal to or greater than 4m, the formwork should be arched; when there is no specific requirement in the design, the arch height should be 1/1000~3/1000 of the full span length.
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Article 2.3.4 For cast-in-place multi-storey houses and structures, the method of layered and segmented formwork shall be adopted, and the installation of the upper formwork and its bracket shall comply with the following provisions: 1. The lower floor slab shall have the bearing capacity to bear the upper load or additional bracket support;
2. The columns of the upper bracket shall be aligned with the columns of the lower bracket, and pads shall be laid; 3. When the suspended formwork and truss formwork method are adopted, the bearing capacity and rigidity of the supporting structure must meet the requirements.
Article 2.3.5 When the inter-layer height is greater than 5m, truss formwork or multi-layer bracket formwork should be selected.
When multi-layer bracket formwork is adopted, the horizontal pad of the bracket shall be flat, the pillars shall be vertical, and the upper and lower pillars shall be on the same vertical center line. Article 2.3.6 When adopting segmented demoulding, the support point of the bottom mold should be set according to the template design, and each section of the template should be on the same plane, and the height difference should not exceed 3mm. Article 2.3.7 When the load-bearing welded steel frame and the template are installed together, the following provisions shall be met:
1. The template must be fixed on the node of the load-bearing welded steel frame; 2. When installing the steel bar template assembly, the sling should be tied according to the design of the template hanging point position.
Article 2.3.8 The embedded parts and reserved holes fixed on the template shall not be omitted, and the installation must be firm and accurate in position. The allowable deviation shall comply with the provisions of Table 2.3.8. Allowable deviation of embedded parts and reserved holes (mm) Items
Centerline position of embedded steel plate
Centerline position of embedded pipe and reserved hole
Embedded bolt
Reserved hole
Centerline position
Exposed length
Centerline position
Internal dimensions of section
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Allowable deviation
W.bzsoso.coIArticle 2 The formwork and its support must meet the following requirements: 1. Ensure the correct shape, size and relative position of each part of the engineering structure and components,
, have sufficient bearing capacity, rigidity and stability, and can reliably withstand the deadweight and lateral pressure of the newly poured concrete, as well as the load generated during the construction process; 3. Simple structure, easy assembly and disassembly, and convenient for the binding, installation of steel bars and the pouring and maintenance of concrete;
4. The joints of the formwork should not leak grout.
Article 2.1.3 The design, production and construction of combined steel formwork, large formwork, sliding formwork, etc. shall comply with the relevant provisions of the current national standards "Technical Specifications for Combined Steel Formwork", "Design and Construction Regulations for Multi-storey Residential Structures with Large Formwork" and "Technical Specifications for Construction of Hydraulic Sliding Formwork".
Article 2.1.4 The contact surface between the formwork and concrete shall be coated with an isolation agent. Isolation agents that affect the structure or hinder the construction of decorative projects such as oil-based ones should not be used. It is strictly forbidden to contaminate the joints between steel bars and concrete with isolation agents.
Article 2.1.5 The formwork and its support should be regularly maintained. Steel formwork and steel support should be prevented from rusting.
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Section 2 Formwork Design
Article 2.2.1 The design of the formwork and its support should be carried out according to the conditions such as the engineering structure form, load size, foundation soil type, construction equipment and material supply. Article 2.2.2 The design of steel formwork and its support should comply with the provisions of the current national standard "Steel Structure Design Code", and its cross-section plastic development coefficient shall be 1.0; its load design value can be multiplied by the coefficient of 0.85 for reduction. The use of cold-bent thin-walled steel should comply with the provisions of the current national standard "Cold-bent Thin-walled Steel Structure Technical Code", and its load design value should not be reduced.
The design of wooden formwork and its support shall comply with the provisions of the current national standard "Wood Structure Design Code": When the moisture content of wood is less than 25%, its load design value can be reduced by multiplying the coefficient of 0.90.
The design of formwork and its support of other materials shall comply with the relevant special regulations. Article 2.2.3 The design of formwork and its support shall consider the following loads: 1. The dead weight of the formwork and its support;
2. The dead weight of the newly poured concrete;
3. The dead weight of the steel bars;
4. The loads of construction personnel and construction equipment,
5. The load generated when vibrating concrete;
6. The pressure of the newly poured concrete on the side of the formwork; 7. The load generated when pouring concrete.
The various loads participating in the combination of the load effects of the formwork and its support shall comply with the provisions of Table 2.2.3, and the combination of load effects shall comply with the provisions of relevant standards. The standard values of loads and partial coefficients can be adopted according to Appendix 1 of this code. Engineering Construction Standards Full-text Information System
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Types of various loads involved in the combination of load effects of formwork and its supports
Formwork and supports for flat plates and thin shells
Bottom plates and supports for beam and arch formwork
Side formwork for beams, arches, columns (side length ≤300mm), walls (thickness ≤100mm)
Side of large-volume structures, columns (side length>300mm), walls (thickness>100mm)
Load items involved in the combination
Calculation Bearing capacity
1,2,3,4
1,2,3,5
Verify stiffness
1,2,3
Article 2.2.4 When verifying the stiffness of the formwork and its support, its maximum deformation value shall not exceed the following allowable values:
1. For the formwork exposed on the surface of the structure, it is 1/400 of the calculated span of the formwork member; 2. For the formwork hidden on the surface of the structure, it is 1/250 of the calculated span of the formwork member; 3. The compression deformation value or elastic deflection of the support is 1/1000 of the corresponding calculated span of the structure.
Article 2.2.5 The columns or trusses of the support shall remain stable and be fixed with bracing rods.
When verifying the anti-toppling stability of the formwork and its support under the action of deadweight and wind loads, the relevant special regulations shall be met. Section 3 Formwork Installation
Article 2.3.1 The supporting parts of vertical formwork and brackets should be equipped with pads when installed on the base soil, and the base soil must be solid and have drainage measures. For collapsible loess, waterproofing measures must be taken; for frost-heaving soil, anti-freeze-thaw measures must be taken. Article 2.3.2 During the installation of the formwork and its bracket, temporary fixing facilities must be set to prevent overturning.
Article 2.3.3 For cast-in-place reinforced concrete beams and slabs, when the span is equal to or greater than 4m, the formwork should be arched; when there is no specific requirement in the design, the arch height should be 1/1000~3/1000 of the full span length.
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Article 2.3.4 For cast-in-place multi-storey houses and structures, the method of layered and segmented formwork shall be adopted, and the installation of the upper formwork and its bracket shall comply with the following provisions: 1. The lower floor slab shall have the bearing capacity to bear the upper load or additional bracket support;
2. The columns of the upper bracket shall be aligned with the columns of the lower bracket, and pads shall be laid; 3. When the suspended formwork and truss formwork method are adopted, the bearing capacity and rigidity of the supporting structure must meet the requirements.
Article 2.3.5 When the inter-layer height is greater than 5m, truss formwork or multi-layer bracket formwork should be selected.
When multi-layer bracket formwork is adopted, the horizontal pad of the bracket shall be flat, the pillars shall be vertical, and the upper and lower pillars shall be on the same vertical center line. Article 2.3.6 When adopting segmented demoulding, the support point of the bottom mold should be set according to the template design, and each section of the template should be on the same plane, and the height difference should not exceed 3mm. Article 2.3.7 When the load-bearing welded steel frame and the template are installed together, the following provisions shall be met:
1. The template must be fixed on the node of the load-bearing welded steel frame; 2. When installing the steel bar template assembly, the sling should be tied according to the design of the template hanging point position.
Article 2.3.8 The embedded parts and reserved holes fixed on the template shall not be omitted, and the installation must be firm and accurate in position. The allowable deviation shall comply with the provisions of Table 2.3.8. Allowable deviation of embedded parts and reserved holes (mm) Items
Centerline position of embedded steel plate
Centerline position of embedded pipe and reserved hole
Embedded bolt
Reserved hole
Centerline position
Exposed length
Centerline position
Internal dimensions of section
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Allowable deviation
W.bzsoso.coIThe pressure of newly poured concrete on the side of the formwork; 7. The load generated when pouring concrete.
The various loads participating in the combination of load effects of the formwork and its supports shall comply with the provisions of Table 2.2.3. The combination of load effects shall comply with the provisions of relevant standards. The standard values of loads and partial factors may be adopted according to Appendix 1 of this code. Engineering Construction Standards Full-text Information System
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The various loads participating in the combination of load effects of the formwork and its supports Formwork categories
Formwork and supports for flat plates and thin shells
Bottom plates and supports for beam and arch formwork
Side formwork for beams, arches, columns (side length ≤300mm), walls (thickness ≤100mm)
Side of large-volume structures, columns (side length>300mm), walls (thickness>100mm)
Load items participating in the combination
Calculation Bearing capacity
1,2,3,4
1,2,3,5
Verify stiffness
1,2,3
Article 2.2.4 When verifying the stiffness of the formwork and its support, its maximum deformation value shall not exceed the following allowable values:
1. For the formwork exposed on the surface of the structure, it is 1/400 of the calculated span of the formwork member; 2. For the formwork hidden on the surface of the structure, it is 1/250 of the calculated span of the formwork member; 3. The compression deformation value or elastic deflection of the support is 1/1000 of the corresponding calculated span of the structure.
Article 2.2.5 The columns or trusses of the support shall remain stable and be fixed with bracing rods.
When verifying the anti-toppling stability of the formwork and its support under the action of deadweight and wind loads, the relevant special regulations shall be met. Section 3 Formwork Installation
Article 2.3.1 The supporting parts of vertical formwork and brackets should be equipped with pads when installed on the base soil, and the base soil must be solid and have drainage measures. For collapsible loess, waterproofing measures must be taken; for frost-heaving soil, anti-freeze-thaw measures must be taken. Article 2.3.2 During the installation of the formwork and its bracket, temporary fixing facilities must be set to prevent overturning.
Article 2.3.3 For cast-in-place reinforced concrete beams and slabs, when the span is equal to or greater than 4m, the formwork should be arched; when there is no specific requirement in the design, the arch height should be 1/1000~3/1000 of the full span length.
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Article 2.3.4 For cast-in-place multi-storey houses and structures, the method of layered and segmented formwork shall be adopted, and the installation of the upper formwork and its bracket shall comply with the following provisions: 1. The lower floor slab shall have the bearing capacity to bear the upper load or additional bracket support;
2. The columns of the upper bracket shall be aligned with the columns of the lower bracket, and pads shall be laid; 3. When the suspended formwork and truss formwork method are adopted, the bearing capacity and rigidity of the supporting structure must meet the requirements.
Article 2.3.5 When the inter-layer height is greater than 5m, truss formwork or multi-layer bracket formwork should be selected.
When multi-layer bracket formwork is adopted, the horizontal pad of the bracket shall be flat, the pillars shall be vertical, and the upper and lower pillars shall be on the same vertical center line. Article 2.3.6 When adopting segmented demoulding, the support point of the bottom mold should be set according to the template design, and each section of the template should be on the same plane, and the height difference should not exceed 3mm. Article 2.3.7 When the load-bearing welded steel frame and the template are installed together, the following provisions shall be met:
1. The template must be fixed on the node of the load-bearing welded steel frame; 2. When installing the steel bar template assembly, the sling should be tied according to the design of the template hanging point position.
Article 2.3.8 The embedded parts and reserved holes fixed on the template shall not be omitted, and the installation must be firm and accurate in position. The allowable deviation shall comply with the provisions of Table 2.3.8. Allowable deviation of embedded parts and reserved holes (mm) Items
Centerline position of embedded steel plate
Centerline position of embedded pipe and reserved hole
Embedded bolt
Reserved hole
Centerline position
Exposed length
Centerline position
Internal dimensions of section
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Allowable deviation
W.bzsoso.coIThe pressure of newly poured concrete on the side of the formwork; 7. The load generated when pouring concrete.
The various loads participating in the combination of load effects of the formwork and its supports shall comply with the provisions of Table 2.2.3. The combination of load effects shall comply with the provisions of relevant standards. The standard values of loads and partial factors may be adopted according to Appendix 1 of this code. Engineering Construction Standards Full-text Information System
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The various loads participating in the combination of load effects of the formwork and its supports Formwork categories
Formwork and supports for flat plates and thin shells
Bottom plates and supports for beam and arch formwork
Side formwork for beams, arches, columns (side length ≤300mm), walls (thickness ≤100mm)
Side of large-volume structures, columns (side length>300mm), walls (thickness>100mm)
Load items participating in the combination
Calculation Bearing capacity
1,2,3,4
1,2,3,5
Verify stiffness
1,2,3
Article 2.2.4 When verifying the stiffness of the formwork and its support, its maximum deformation value shall not exceed the following allowable values:
1. For the formwork exposed on the surface of the structure, it is 1/400 of the calculated span of the formwork member; 2. For the formwork hidden on the surface of the structure, it is 1/250 of the calculated span of the formwork member; 3. The compression deformation value or elastic deflection of the support is 1/1000 of the corresponding calculated span of the structure.
Article 2.2.5 The columns or trusses of the support shall remain stable and be fixed with bracing rods.
When verifying the anti-toppling stability of the formwork and its support under the action of deadweight and wind loads, the relevant special regulations shall be met. Section 3 Formwork Installation
Article 2.3.1 The supporting parts of vertical formwork and brackets should be equipped with pads when installed on the base soil, and the base soil must be solid and have drainage measures. For collapsible loess, waterproofing measures must be taken; for frost-heaving soil, anti-freeze-thaw measures must be taken. Article 2.3.2 During the installation of the formwork and its bracket, temporary fixing facilities must be set to prevent overturning.
Article 2.3.3 For cast-in-place reinforced concrete beams and slabs, when the span is equal to or greater than 4m, the formwork should be arched; when there is no specific requirement in the design, the arch height should be 1/1000~3/1000 of the full span length.
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Article 2.3.4 For cast-in-place multi-storey houses and structures, the method of layered and segmented formwork shall be adopted, and the installation of the upper formwork and its bracket shall comply with the following provisions: 1. The lower floor slab shall have the bearing capacity to bear the upper load or additional bracket support;
2. The columns of the upper bracket shall be aligned with the columns of the lower bracket, and pads shall be laid; 3. When the suspended formwork and truss formwork method are adopted, the bearing capacity and rigidity of the supporting structure must meet the requirements.
Article 2.3.5 When the inter-layer height is greater than 5m, truss formwork or multi-layer bracket formwork should be selected.
When multi-layer bracket formwork is adopted, the horizontal pad of the bracket shall be flat, the pillars shall be vertical, and the upper and lower pillars shall be on the same vertical center line. Article 2.3.6 When adopting segmented demoulding, the support point of the bottom mold should be set according to the template design, and each section of the template should be on the same plane, and the height difference should not exceed 3mm. Article 2.3.7 When the load-bearing welded steel frame and the template are installed together, the following provisions shall be met:
1. The template must be fixed on the node of the load-bearing welded steel frame; 2. When installing the steel bar template assembly, the sling should be tied according to the design of the template hanging point position.
Article 2.3.8 The embedded parts and reserved holes fixed on the template shall not be omitted, and the installation must be firm and accurate in position. The allowable deviation shall comply with the provisions of Table 2.3.8. Allowable deviation of embedded parts and reserved holes (mm) Items
Centerline position of embedded steel plate
Centerline position of embedded pipe and reserved hole
Embedded bolt
Reserved hole
Centerline position
Exposed length
Centerline position
Internal dimensions of section
Engineering Construction Standard Full-text Information System
Allowable deviation
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