GB 50550-2010 English PDF
Basic dataStandard ID: GB 50550-2010 (GB50550-2010)Description (Translated English): Code for acceptance of construction quality of strengthening building structures Sector / Industry: National Standard Classification of Chinese Standard: P20 Word Count Estimation: 321,394 Date of Issue: 2010-07-15 Date of Implementation: 2011-02-01 Quoted Standard: GB 50010; GB/T 50080; GB/T 50081; GB 50119; GB 50203; GB 50204; GB 50205; GB 50300; GB/T 50315; GB/T 50344; GB 50367; GB/T 50448; GB 175; GB 199; GB/T 228; GB/T 343; GB/T 700; GB/T 985; GB/T 1446; GB 1499.1; GB 1499.2; GB/T 1591; GB/T 3098; GB/T 3323; GB/T 3354; GB/T 3366; GB/T 5117; GB/T 5118; GB/T 5223; GB/T 5224; GB/T 7123; GB/T 7124; GB 8076; GB/T 8077; GB/T 9914.3; GB/T 9944; GB 11345; GB/T 13014; GB/T 13354; GB/T 13477; GB/T 14370; GB/T 15239; GB/T 17671; JGJ 18; JGJ 52; JGJ 63; JGJ 70; JGJ 81; JGJ 82; JGJ 104; JG 160; JG/T 682; JG 3019; JG 3056; YB/T 5197; JC/T 170; JC/T 901; JC/T 681; HG/T 2625; DL/T 5150 Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 683 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This Chinese standard applies to concrete structures, masonry and steel reinforcement construction process control engineering and construction quality acceptance. GB 50550-2010: Code for acceptance of construction quality of strengthening building structures---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 In order to strengthen the quality management of building structure reinforcement projects, unify the acceptance of construction quality of building structure reinforcement projects, and ensure the quality and safety of the projects, this specification is formulated. 1.0.2 This code is applicable to the construction process control and construction quality acceptance of concrete structures, masonry structures and steel structure reinforcement projects. 1.0.3 The requirements for the quality of the reinforcement project stipulated in the technical documents and contract of the building structure reinforcement project shall not be lower than those specified in this specification. 1.0.4 This specification should be used in conjunction with the following current national standards. 1 "Unified Standards for Construction Quality Acceptance of Construction Engineering" GB 50300; 2 "Code for Construction Quality Acceptance of Concrete Structure Engineering" GB 50204; 3 "Code for Acceptance of Masonry Construction Quality" GB 50203; 4 "Code for Construction Quality Acceptance of Steel Structure Engineering" GB 50205. 1.0.5 The construction process control and construction quality acceptance of the building structure reinforcement project shall not only implement this specification and the supporting standard specifications, but also comply with the current relevant national standards. 2 terms2.1 General terms 2.1.1 structure strengthening engineering Reinforce or adjust the internal force of unreliable load-bearing structures, components and related parts to make them have sufficient safety and durability, and strive to maintain their applicability. 2.1.2 quality of structure strengthening engineering It reflects that the structural reinforcement project meets the requirements stipulated in the current relevant standards or agreed in the contract, including the sum of all the characteristics of its obvious and implied capabilities in terms of safety performance, durability performance, use function and environmental protection. 2.1.3 acceptance The quality of the structural reinforcement project is based on the self-inspection and evaluation of the construction unit, and the relevant units involved in the project activities will jointly conduct a sampling review of the quality of the inspection batch, sub-item, sub-division, and sub-division project, and in written form according to the current relevant standards. Confirm whether the project quality is qualified or not. 2.1.4 site inspection Reinforcement materials, products, components, connectors, anchors, appliances and equipment entering the construction site shall be inspected or inspected in accordance with the requirements of relevant standards to confirm whether their quality is qualified or not. 2.1.5 Repeat test For reinforcement materials and products related to safety or function, when they enter the site, no matter what kind of inspection certificate they hold in advance, witness sampling inspection activities should be carried out according to the items specified in the current relevant standards and regulations. 2.1.6 Batch lot A product or material collection composed of a certain number of individuals (or bulk materials) that is produced and constructed under consistent conditions, or assembled in a prescribed manner. 2.1.7 inspection lot A batch to be inspected designated for sampling inspection (inspection). 2.1.8 witness sampling evidence sampling Under the supervision of the supervisory unit or the construction unit (owner), the on-site sampling process is carried out by professionals from the construction unit or testing agency. The samples that witness the sampling should be signed and sealed by the supervisor, and sent to an independent testing agency with corresponding qualifications for testing. 2.1.9 dominant item Inspection items that play a decisive role in safety, sanitation, environmental protection and public interest in structural reinforcement engineering. 2.1.10 general item Inspection items other than master control items. 2.1.11 Existing structure member Original (existing) components before reinforcement. 2.1.12 Substrate One of the adherends coated with adhesive or other bonding material. In structural reinforcement engineering, it refers to the original components to be bonded. If the original component is a composite material or composite material, it refers specifically to the material of the bonded part. 2.2 Material Terminology 2.2.1 Structural adhesives Adhesives used for the bonding of load-bearing structural members that can withstand design stress and environmental effects for a long time. In civil engineering, based on the limitation of site conditions, the structural adhesives used mainly refer to structural adhesives cured at room temperature. 2.2.2 Primer In order to improve the bonding performance and prevent the substrate surface from being polluted or corroded, it is first coated on the bonding surface of the substrate, and has good compatibility and adhesion with structural adhesives and substrates. cured adhesive. 2.2.3 repairing adhesive for concrete crack Adhesives formulated with low-viscosity modified epoxy adhesives for filling and sealing concrete cracks, also known as crack repair agents. When there is reliable engineering experience, other modified synthetic resins can also be used instead of modified epoxy resin for preparation. If the project requires restoring the integrity and strength of cracked concrete, a crack repairing glue (agent) with repairing function formulated with high-bonding structural glue should be used, also known as crack repairing glue (agent). 2.2.4 grout for concrete crack A highly fluid, plastic, pressure-injected crack repair material, generally divided into two types. modified epoxy grout and modified cement-based grout. 2.2.5 Structural interfacial adhesive (agent) Adhesives coated on the surface of substrates to improve the mutual bonding performance between bonding materials, reinforcement materials and substrates are specifically called structural interface adhesives (agents). Its performance and quality are completely different from general interface treatment agents. 2.2.6 fiber-reinforced polymer (FRP), composite FRP A polymer composite material made of continuous fiber or its products with required characteristics as a reinforcing material, bonded with a matrix-structural adhesive, referred to as a fiber composite material. Carbon fiber composites, glass fiber composites and aramid fiber composites are commonly used in engineering structures. 2.2.7 Corrosion inhibitor An inhibitor that can inhibit the electrochemical corrosion of steel bars in concrete; it is generally divided into two types. mixing type and spraying type. In structural reinforcement, the latter is generally used; incorporation inhibitors are used only when re-pouring concrete. 2.2.8 polymer motar High-strength cement mortar mixed with modified epoxy emulsion (or water-based epoxy) or other modified copolymer emulsions. The polymer mortar used for structural reinforcement has special requirements on safety performance and should be distinguished from ordinary polymer mortar. 2.2.9 grout for structural strengthening In the concrete enlarging section project, in order to ensure the tight connection between the old and new concrete in the reinforcement-intensive part, fill it full and reduce shrinkage, it is a high-quality cement-based grout mixed with fine stone concrete. 2.3 Construction Terminology 2.3.1 surface treatment surface treatment, surface preparation The physical or chemical treatment of the surface of the reinforcement material to improve the adhesion between the original component, or between new and old substrates. Physical treatment is the main method in structural reinforcement engineering. 2.3.2 degree of plainness After the original structural components are trimmed and treated, the degree of undulation and unevenness on the surface is still allowed. 2.3.3 degree of gravity vertical Within the height range specified in the design, the degree to which the surface axis of the reinforced member deviates from the gravity line. 2.3.4 Displacement of axes The deviation between the actual position of the axis and the design position after strengthening of the structure or component. 2.3.5 Dimensional errors The difference between the actual geometric dimensions of structures and components and the original design dimensions. 2.3.6 Defects The inspection items or inspection points found in the construction quality inspection of structural reinforcement projects that do not meet the specified requirements can be divided into serious defects and general defects according to their degree. The former has a decisive impact on the mechanical performance or function of the reinforced structure and components, The latter has no decisive effect. 2.3.7 Repair Renovation and remedial measures for structural reinforcement engineering parts whose construction quality does not meet the requirements of the current code. 2.3.8 rework Measures for re-making and re-construction of structural reinforcement engineering parts that are unqualified in construction quality and cannot be repaired.3 Basic Regulations3.0.1 The construction site quality management of the building structure reinforcement project should have corresponding construction technical standards, a sound quality management system, a construction quality control and quality inspection system, and an assessment system for comprehensively evaluating the construction quality level. 3.0.2 As a subdivision project of construction engineering, the building structure reinforcement project should be divided into several subdivision projects according to the types of reinforcement materials and construction technology characteristics; each subdivision project should be classified according to its main types of work, materials and Divided into several sub-projects; each sub-project should be divided into several inspection batches according to the needs of its construction process control and construction quality acceptance. The specific division of sub-divisional projects and sub-projects shall comply with the provisions of Appendix A of this specification. 3.0.3 Construction quality control shall be carried out in accordance with the following regulations for building structure reinforcement works. 1.The structural reinforcement design unit shall submit the technical disclosure to the construction unit according to the approved construction drawing; the construction unit shall prepare the construction organization design and construction technical plan based on this, and organize the implementation after review and approval; It is strictly forbidden to use unqualified stability cement, chloride-containing cement, expired cement and damp cement in the reinforcement concrete. Quantity for inspection. For the same manufacturer, the same grade, the same variety, the same batch number, and the same cement entering the site at the same time, 30t is regarded as a batch (if it is less than 30t, it is counted as 30t), and each batch of witness sampling should not be less than once. Inspection method. check the product certificate, factory inspection report and entry re-inspection report. 4.1.2 The quality and application technology of admixtures (excluding rust inhibitors) used in ordinary concrete shall meet the requirements of the current national standard "Concrete Admixtures" GB 8076 and "Technical Specifications for Concrete Admixtures" GB 50119. The concrete used for structural reinforcement shall not use admixtures containing chloride or nitrite; the concrete used for superstructure reinforcement shall not use expansion agents. Shrinkage reducers should be used when necessary. Quantity for inspection. according to the incoming batches and in accordance with the provisions of Appendix D of this specification. Inspection method. Check the product certificate, factory inspection report (including cement adaptability inspection report) and entry re-inspection report. 4.1.3 Fly ash shall not be mixed into the concrete mixed on site. When ready-mixed concrete mixed with fly ash is used, the fly ash should be Class I ash, and the loss on ignition should not exceed 5%. Inspection Quantity. Check batch by batch. Inspection method. Check the fly ash grade certificate issued by the fly ash production plant, the factory inspection report and the fly ash loss on ignition inspection report issued by the commercial concrete inspection agency. (Ⅱ) General items 4.1.4 The type and quality of the coarse and fine aggregates of the concrete used for structural reinforcement shall meet the requirements of the current industry standard JGJ 52 "Quality and Inspection Method Standards for Sand and Stone Used in Ordinary Concrete", and shall also meet the following requirements. Regulation. 1 The maximum particle size of coarse aggregate. for mixed concrete, it should not be greater than 20mm; for shotcrete, it should not be greater than 12mm; for concrete mixed with short fibers, it should not be greater than 10mm; 2 The fine aggregate should be medium to coarse sand, and its fineness modulus should not be less than 2.5. Quantity for inspection. re-inspection sampling according to the incoming batches and products and complying with the provisions of Appendix D of this specification. Inspection method. check the entry re-inspection report. 4.1.5 Concrete should be mixed with drinking water or natural clean water whose water quality complies with the current industry standard "Concrete Water Standard" JGJ 63. Number of inspections. The same water source should be inspected no less than once. Inspection method. Send to an independent testing organization for testing. 4.2 Steel ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50550-2010_English be delivered?Answer: Upon your order, we will start to translate GB 50550-2010_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB 50550-2010_English with my colleagues?Answer: Yes. 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