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GB 50666-2011 English PDF (GB50666-2011)

GB 50666-2011 English PDF (GB50666-2011)

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GB 50666-2011: Code for construction of concrete structures

This Code is formulated with a view to implementing the national technical and economic policies, ensuring the engineering quality, and realizing advanced technology, reasonable process, resources conservation and environmental protection during the construction of concrete structures. This Code is applicable to the construction of concrete structures in building engineering, not to the construction of lightweight aggregate concrete and special concrete.
GB 50666-2011
Code for Construction of Concrete Structures
NATIONAL STANDARD OF THE PEOPLE REPUBLIC OF CHINA
UDC
P GB 50666-2011
ISSUED ON: JULY 29, 2011
IMPLEMENTED ON: AUGUST 1, 2012
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
1 General Provisions ... 9
2 Terms ... 10
3 Basic Requirements ... 12
3.1 Construction Management ... 12
3.2 Construction Technology ... 12
3.3 Construction Quality and Safety ... 13
4 Formwork ... 15
4.1 General Requirements ... 15
4.2 Materials ... 15
4.3 Design ... 15
4.4 Fabrication and Installation ... 20
4.5 Removal and Maintenance ... 24
4.6 Quality Control ... 25
5 Reinforcement ... 27
5.1 General Requirements ... 27
5.2 Materials ... 27
5.3 Reinforcement Fabrication ... 28
5.4 Reinforcement Connection and Fixing ... 30
5.5 Quality Control ... 34
6 Prestressed Concrete ... 37
6.1 General Requirements ... 37
6.2 Materials ... 37
6.3 Fabrication and Installation ... 38
6.4 Post-tensioning and Pre-tensioning ... 42
6.5 Grouting and Anchorage Protection ... 46
6.6 Quality Control ... 48
7 Concrete Production and Transportation ... 51
7.1 General Requirements ... 51
7.2 Materials ... 51
7.3 Mix Proportioning ... 54
7.4 Mixing ... 57
7.5 Transportation ... 59
7.6 Quality Control ... 59
8 Cast-in-situ Concrete ... 63
8.1 General Requirements ... 63
8.2 Conveying ... 63
8.3 Placing ... 66
8.4 Compacting ... 72
8.5 Curing ... 73
8.6 Construction Joint and Post-cast Strip ... 75
8.7 Crack Control of Mass Concrete ... 77
8.8 Quality Control ... 80
8.9 Repair of Concrete Defects ... 82
9 Precast Concrete ... 85
9.1 General Requirements ... 85
9.2 Checking ... 85
9.3 Production ... 88
9.4 Storage and Transportation ... 90
9.5 Erection ... 91
9.6 Quality control ... 94
10 Construction in Cold, Hot and Rainy Weather ... 97
10.1 General Requirements ... 97
10.2 Cold Weather Requirements ... 97
10.3 Hot Weather Requirements ... 101
10.4 Rainy Weather Requirements ... 103
11 Environmental Protection ... 105
11.1 General Requirements ... 105
11.2 Environmental Considerations ... 105
Appendix A -- Characteristic Value of Loads Acting on Formwork ... 107
Appendix B -- Nominal Diameter, Nominal Sectional Area, Calculation Sectional Area and Theoretical Weight of Common Reinforcement ... 110
Appendix C -- Minimum Splicing Length of Longitudinal Reinforcement ... 112 Appendix D -- Calculation and Measurement Method for Elongation of Prestressed Tendon ... 114
Appendix E -- Testing Method for Prestressing Loss Due to Friction ... 116 Appendix F -- Specification of Concrete Materials ... 118
Explanation of Wording in This Code ... 124
List of Quoted Standards ... 125
1 General Provisions
1.0.1 This Code is formulated with a view to implementing the national technical and economic policies, ensuring the engineering quality, and realizing advanced technology, reasonable process, resources conservation and environmental protection during the construction of concrete structures.
1.0.2 This Code is applicable to the construction of concrete structures in building engineering, not to the construction of lightweight aggregate concrete and special concrete.
1.0.3 This Code contains the basic requirements for the construction of concrete structures. When there are special requirements for the construction stated in the design documents, the construction shall also be implemented in accordance with the design documents.
1.0.4 Construction of concrete structures shall not only meet the requirements of this Code but also comply with those in the current relevant standards of the nation. 2 Terms
2.0.1 Concrete structure
The structure mainly made of concrete, including plain concrete structure, reinforced concrete structure and prestressed concrete structure, which may be classified into cast-in-situ concrete structure and precast concrete structure according to the construction method.
2.0.2 Cast-in-situ concrete structure
The concrete structure that is made by erecting formwork in situ and integral casting, hereinafter referred to as cast-in-situ structure.
2.0.3 Precast concrete structure
The concrete structure that is made by assembling and connecting the precast concrete members or parts, hereinafter referred to as precast structure. 2.0.4 Workability of concrete
The features that shall be possessed of by the concrete mixture in order to meet the construction operation requirements and ensure the concrete uniformity and compactness, mainly including flowability, cohesiveness and water-retaining property. It is hereinafter referred to as workability of concrete.
2.0.5 Self-compacting concrete
The concrete that can flow and be compacted under the action of deadweight, dispensing with the vibration by external force.
2.0.6 Pre-tensioning
It is a kind of construction method that establishes prestress by firstly post-tensioning the prestressed tendon on a pedestal or formwork and temporarily anchoring it with grip, concreting and then pre-tensioning the prestressed tendon after the concrete reaching a certain specified strength.
2.0.7 Post-tensioning
It is a kind of construction method that establishes prestress by post-tensioning the prestressed tendon after the concrete of a structural member reaching a certain 3 Basic Requirements
3.1 Construction Management
3.1.1 The construction organizations for the concrete structures shall have corresponding qualification and establish corresponding quality management system as well as construction quality control and inspection system.
3.1.2 Organization structuring and manning of construction project department shall meet the construction management requirements of concrete structures. Construction operation personnel shall receive training to acquire the basic knowledge and skills required for their respective posts.
3.1.3 Before construction, the development organization shall organize the design, construction and supervision organizations to carry out the technical disclosure and joint trial for the design documents. The in-depth design documents completed by the construction organization shall be confirmed by the original design organization. 3.1.4 The construction organization shall ensure the authenticity, effectiveness, integrity and completeness of the construction documents. Construction project technical leader shall organize the data preparation, collection, arrangement, examination and verification, and timely archiving and filing during the whole construction process.
3.1.5 The construction organization shall establish specific construction schemes according to the requirements of the design documents and construction organization design, which shall be implemented after examined and approved by the supervision organization.
3.1.6 Before construction of concrete structures, the construction organization shall establish emergency plan upon the contingent hazards, disasters and emergencies at the construction site. Technical disclosure and training shall be carried out for the emergency plan, and drilling shall be carried out if necessary.
3.2 Construction Technology
3.2.1 Before construction of concrete structures, the construction process shall be determined according to the structure types, characteristics and construction conditions, and each preparation work shall be completed.
3.2.2 Construction process monitoring should be carried out and construction control measures shall be timely adjusted for the concrete structures that have complex shape, relatively large height or span, complex subgrade conditions and particular construction environment conditions.
3.2.3 The new technologies, new processes, new materials and new equipment adopted during the construction of concrete structures shall be evaluated and filed according to the relevant requirements. The new construction processes or those adopted for the first time shall be evaluated before construction, and special construction schemes shall be established and verified by the supervision organization.
3.2.4 The patented technologies adopted during the construction of concrete structures shall not be in violation of the relevant requirements of this Code. 3.2.5 Effective environmental protection measures shall be taken during the construction of concrete structures.
3.3 Construction Quality and Safety
3.3.1 Each procedure of concrete structures shall be constructed after qualified check for the last procedure.
3.3.2 Self-inspection, mutual inspection and handover inspection shall be carried out timely during the construction of concrete structures. The quality of concrete structures shall not be lower than the relevant requirements of the current national standard "Code for Acceptance of Constructional Quality of Concrete Structures" (GB 50204). The quality problems discovered during the inspection shall be settled promptly according to the established procedures.
3.3.3 During the construction of concrete structures, efforts shall be made to accept the concealed work, strengthen quality control or testing for the important procedures and key positions, keep records in detail, and keep the image data.
3.3.4 Materials, products and equipment used during the construction of concrete structures shall meet the requirements of the current relevant standards of the nation, the design documents and the construction schemes.
3.3.5 When the materials, semi-finished products and finished products approach the construction site, their specifications, models, appearance and quality certificates shall be inspected in accordance with the relevant requirements of the current national standard "Code for Acceptance of Constructional Quality of Concrete Structures" (GB 50204).
3.3.6 After approaching the construction site, the materials shall be stored and stacked separately as the types, specifications and batches, and marked clearly. 4 Formwork
4.1 General Requirements
4.1.1 Special construction scheme shall be prepared for the formwork. Technology demonstration shall be carried out for the special construction schemes of tall formwork support and such tool-type formwork as sliding formwork and creeping formwork.
4.1.2 Formwork and support shall be designed to have adequate bearing
capacity and rigidity and ensure the overall stability according to various operating conditions during the construction.
4.1.3 Formwork and support shall ensure the accuracy of the shape, dimension and position of the structure and member, which shall also be convenient for the reinforcement installation and concrete placing and maintenance.
4.2 Materials
4.2.1 Technical indexes of formwork and support materials shall meet the requirements of the current relevant standards of the Nation.
4.2.2 Light-weight, high-strength and durable materials should be used in the formwork and support. The standard approved products should be selected as the connection.
4.2.3 The formwork exposed to concrete shall be smooth on the surface and shall have good abrasion resistance and hardness. The panel materials of fair-faced concrete formwork shall be able to ensure the required facing effect after formwork stripping.
4.2.4 Release agent shall be able to reduce the adsorptive power between concrete and formwork in an effective way, have certain film formation strength, and shall not affect the later-stage decoration on the concrete surface after formwork stripping. 4.3 Design
4.3.1 Types and construction of formwork and support shall be determined according to such conditions as engineering structure type, load, subsoil category, construction equipment and material supply.
4.3.2 Formwork and support design shall include the following contents: 1 Model selection and structure design of formwork and support;
2 Load and its effect calculation on the formwork and support;
3 Checking for bearing capacity and rigidity of formwork and support;
4 Checking for overturning resistance of formwork and support;
5 Drawing of formwork and support construction drawing.
4.3.3 Formwork and support design shall meet the following requirements: 1 Limit states design method expressed by the partial coefficients should be adopted in the structure design of formwork and support;
2 Calculation assumption and analysis model adopted in the structural analysis of formwork and support shall be provided with theory or test basis, or proved feasible through engineering verification;
3 Structural analysis shall be carried out for the formwork and support according to various stressed operating conditions during construction, and the most unfavorable action effect combination shall be determined;
4 Fundamental combination of loads shall be adopted for the calculation of bearing capacity; only the characteristic value of permanent load may be adopted for the deformation checking.
4.3.4 As for the design of formwork and support, the loads under different operating conditions and their combinations shall be calculated according to the actual conditions. Characteristic value of each load may be determined according to Appendix A of this Code.
4.3.5 Bearing capacity of structural member of formwork and support shall be calculated according to the temporary design conditions. Calculation of bearing capacity shall meet the requirements of the following formula:
RS ?????? ???0 ?€??€??€??€??€??€??€??€??€??€??€??€??€??€??€??€??€??€??€?. (4.3.5)
Where,
0??? -- Significance coefficient of structure, which should be 0??? ???1.0 for the important formwork and support and shall be 0??? ???0.9 for the ordinary formwork and support; coupler on the top, the bearing capacity of upright tube shall be checked according to the eccentric distance not less than 50mm; the bearing capacity of upright tube in tall formwork support shall be checked according to the eccentric distance not less than 100mm;
4 The bearing capacity of the top horizontal tube supporting the formwork may be checked according to the flexural member;
5 The anti-sliding bearing capacity of coupler may be checked according to the relevant requirements of the current professional standard "Technical Code for Safety of Steel Tubular Scaffold with Couplers in Construction" JGJ 130.
4.3.16 Where the support is erected with frame type, bowl-coupler type, disk lock type or pin-on-disk type of steel tubular scaffolds, the central load transfer mode by inserting the support column tube end into the base jack shall be adopted, the bearing capacity and rigidity of the support may be checked according to the requirements of the current relevant standards of the Nation.
4.4 Fabrication and Installation
4.4.1 Formworks shall be processed and fabricated according to the drawings. Strongly-universal formworks should be fabricated into the approved ones. 4.4.2 Formwork panel walings should have uniform section height. During the fabrication and installation of formwork, the panels shall be spliced tightly. As for the walls with water-proof requirements, water-stop, which shall be connected with split bolt by circumference welding, shall be arranged in the middle of formwork split bolt. 4.4.3 The special support matching with the universal steel pipe support shall be processed and fabricated according to the drawings. The girder placed on the base jack on the top of support may be made of batten, timber beam or section steel with symmetrical sections.
4.4.4 Support column and vertical formwork, when installed on the soil layer, shall meet the following requirements:
1 Subplates with sufficient strength and bearing area shall be arranged; 2 The soil layer shall be solid and provided with drainage measures; as for the collapsible loess and expansive soil, waterproof measures shall be provided; as for the frost heaving soil, frost heaving prevention measures shall be provided; 3 As for the soft subgrade, the preloading method may be adopted, if necessary, to adjust the installation height of formwork panel.
included angle between diagonal bracing and horizontal tube should be 45?? ~ 60??. When the support height is greater than 3 times of the lift height, one horizontal diagonal bracing should be arranged on the top of support and the diagonal bracing shall be extended to the surroundings.
6 Splicing length of upright tube, horizontal tube and diagonal bracing shall not be less than 0.8m and they shall be connected with at least 2 couplers; the distance from the edge of coupler cover plate to the tube end shall not be less than 100mm. 7 Tightening torque of coupler bolt shall not be less than 40N???m and shall not be greater than 65N???m.
8 Erecting vertical deviation of support upright tube should not be greater than 1/200. 4.4.8 Where the coupler type steel pipe is used as the tall formwork support, the erection of support shall not only comply with Article 4.4.7 of this Code but also meet the following requirements:
1 Base jack should be inserted on the top of support upright tube; the outer diameter of base jack screw shall not be less than 36mm; the length of screw inserted into the steel pipe shall not be less than 150mm and that of screw out of steel pipe shall not be greater than 300mm; the cantilever length of base jack out of top horizontal tube shall not be greater than 500 mm;
2 Longitudinal spacing of upright tube and transverse spacing of upright tube shall not be greater than 1.2m; support lift height shall not be greater than 1.8m; 3 Where splicing is adopted within the top lift height of upright tube, the splicing length shall not be less than 1m and they shall be connected with at least 3 couplers; 4 Bottom horizontal tube should be arranged on the longitudinal and transverse directions of upright tube; the distance from the longitudinal bottom horizontal tube to the bottom of upright tube should not be greater than 200mm;
5 The longitudinal or transverse vertical diagonal bracing should be arranged in the middle; the spacing between diagonal bracing should not be greater than 5m; the spacing between the horizontal diagonal bracing erected along the height direction of support should not be greater than 6m;
6 Erecting vertical deviation of upright tube should not be greater than 1/200 and should not be greater than 100mm;
7 Overall stability of support shall be strengthened by the effective connecting measures which are taken according to the peripheral structure conditions. 4.5.7 The formwork and support member removed shall not be thrown, but stacked in the designated place in a scattered way and timely cleared and transported. 4.5.8 After formwork removal, the surface of the member shall be cleaned, and the deformation and damage positions shall be repaired.
4.6 Quality Control
4.6.1 Site inspection of member and connection of formwork and support shall meet the following requirements:
1 Formwork surface shall be smooth; cementing layer of plywood formwork shall be free from degumming or warped corners; support members shall straight and even, free from severe deformation and rusting; connection shall be free from severe deformation and rusting, as well as cracks;
2 Specification and dimension of formwork, diameter and wall thickness of support member, and quality of connection, shall meet the design requirements;
3 As for th...

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