GBJ 321-1990 Precast concrete component quality inspection and assessment standard GBJ321-90 GBJ321-1990 standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Quality Inspection and Evaluation Standard of Precast Concrete Components
GBJ321—90
1991Beijing
Engineering Construction Standard Full-text Information System
W Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Quality Inspection and Evaluation Standard of Precast Concrete Components
GBJ321—90
Editor Department: Former Urban and Rural Construction Bureau of the People's Republic of China Ministry of Environmental Protection Approval department: Ministry of Construction of the People's Republic of China Effective date: 199
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the promulgation of the national standard "Standard for Quality Inspection and Assessment of Precast Concrete Components"
(90) Jianbiaozi No. 241
According to the requirements of the State Planning Commission's Document No. Jizong [1985] 1, the "Standard for Quality Inspection and Assessment of Precast Concrete Components" revised by the China Academy of Building Research and relevant units has been reviewed by relevant departments. The "Standard for Quality Inspection and Assessment of Precast Concrete Components" GBJ321-90 is now approved as a national standard and will be implemented on August 1, 1991. The original "Standard for Quality Inspection and Assessment of Building Installation Engineering-Reinforced Concrete Precast Component Engineering" TJ321-76 is abolished at the same time.
This standard is managed by the Ministry of Construction, and the specific interpretation and other work is undertaken by the China Academy of Building Research. The publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
May 17, 1990
Engineering Construction Standard Full Text Information System
W.bzsosO.cO Engineering Construction Standard Full Text Information System
Revision Notes
This standard is based on the requirements of the former State Planning Commission's Document No. 1 [1985], and is under the responsibility of the former Ministry of Urban and Rural Construction and Environmental Protection. Specifically, the China Academy of Building Research and relevant units jointly revised the "Standard for Inspection and Evaluation of Building Installation Engineering Quality-Reinforced Concrete Prefabricated Component Engineering" TJ321-76. During the revision process, the revision team conducted extensive investigations and studies, carefully summarized the experience since the implementation of the original standard, absorbed some scientific research results, and widely solicited opinions from relevant units across the country. Finally, the former Ministry of Urban and Rural Construction and Environmental Protection and relevant departments reviewed and finalized it.
This standard is divided into seven chapters and five appendices. The main contents of this revision are: the name of this standard is changed to "Prefabricated Concrete Component Quality Inspection and Assessment Standard"; the scope of application is expanded to include the quality inspection and assessment of prefabricated concrete components produced on the construction site; the quality inspection and assessment of concrete sub-items are added, and on the basis of the assessment of each sub-item, the provisions for the quality grade assessment of the inspection batch of prefabricated components are supplemented; the requirements for determining the product rate of each batch of components and the method for correcting the qualified point rate of the component appearance quality and allowable deviation items are proposed to match the current national standard "Concrete Structure Design Code" GBJ10-89, and the corresponding structural performance inspection indicators and their calculation methods are given; the application scope of the secondary sampling inspection method in the structural performance inspection and assessment is expanded.
During the implementation of this standard, if there is a need for modification or supplementation, please send your opinions and relevant materials to the Structure Institute of China Academy of Building Research for reference in future revisions.
Ministry of Construction
May 1990
Engineering Construction Standards Full Text Information System
W.bzsoso.coIEngineering Construction Standards Full Text Information System
Chapter 1 General
Chapter 2 Basic Provisions
Chapter 3 Mould
Chapter 4 Steel
Section 1 Raw
Section 2 Semi-finished
Section 3 Composite
Chapter 5 Mixed
Raw Materials and Mixtures·
Section 1
Concrete Strength
Section 2
Chapter 6
Chapter 7
Appendix 1
Appendix 2
Appendix 3
Appendix Appendix 4
Appendix 5
Structural performance
Structural performance test parameters and inspection indicators. ·Structural performance test methods
Precast concrete component factory production quality level Conversion of concrete design number and strength grade Explanation of terms used in this standard
Additional explanation
Attached clause explanation·
Engineering Construction Standard Full Text Information System
(31)
(40)
(45)
W.bzsoso：cOn Engineering Construction Standard Full Text Information System
Chapter 1 General
In order to strengthen enterprise management and ensure the quality of precast concrete components, this standard is specially formulated.
This standard is applicable to the inspection and evaluation of the quality of precast concrete components for industrial and civil buildings and general structures produced in factories and construction sites. Article 1.0.3 The main quality requirements and inspection indicators in this standard are formulated in accordance with the principles of the current national standards "Concrete Structure Design Code", "Concrete Structure Engineering Construction and Acceptance Code" and "Concrete Strength Inspection and Evaluation Standard".
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Basic Provisions
Article 2.0.1 The quality inspection of precast concrete components is divided into five sub-items: formwork, steel bars, concrete, components and structural performance. The inspection content includes guarantee items, basic items and allowable deviation items.
Article 2.0.2 The quality assessment of the three sub-items of formwork, steel bars and components is divided into two levels: "qualified" and "excellent". The results of the assessment are the basis for assessing the production quality of the production team.
Article 2.0.3 The quality level of formwork, reinforcement and component manufacturing shall be evaluated according to the following provisions:
I. Qualified
1. Guaranteed items: must comply with the provisions of this standard; 2. Basic items: should comply with the provisions of this standard; 3. Allowable deviation items: 70% or more of the inspection points of the allowable deviation items shall comply with the provisions of this standard, and the remaining inspection points shall also basically meet the requirements of this standard. III. Excellent
On the basis of qualified, 90% or more of the inspection points of the allowable deviation items shall comply with the provisions of this standard.
Note: ① For each column, truss, thin web beam, wall panel and other component formwork, reinforcement and component, if there are two or more elevations, cross-sectional dimensions, important embedded parts and reserved holes in the same allowable deviation item, they should be measured separately and participate in the evaluation.
② The inspection of the appearance quality of the component should also be included in the quality evaluation of the component sub-item: and the evaluation shall be carried out according to the provisions of the allowable deviation items.
Article 2.0.4 The production quality of formwork, steel bars, concrete and components shall be inspected and evaluated by full-time inspectors based on the inspection quantity specified in this standard, on the basis of self-inspection, mutual inspection and handover inspection by the team. Engineering 2 Construction Standard Full Text Information System
W.bzsoso.coI Engineering Construction Standard Full Text Information System
Article 2.0.5 The quality of steel bars and concrete raw materials, the mechanical properties of steel bar processing and welding, concrete strength, structural properties of components, etc. shall be inspected and tested in accordance with the requirements of relevant standards, and test reports shall be submitted and filed for future reference. Article 2.0.6 The design drawings of precast concrete components shall comply with the relevant provisions of Appendix 1 of this standard.
For precast concrete components with special quality requirements, the corresponding inspection requirements must be indicated in the design drawings.
Article 2.0.7 The quality inspection department of the precast concrete component factory and the construction site shall evaluate the quality level of each inspection batch of components based on the test and inspection data of steel bars, concrete, components and structural performance. When the quality of the above-mentioned sub-items is "qualified", the batch of components is rated as "qualified". On the basis of qualification, when the quality of the component sub-items is "excellent", the batch of components is rated as "excellent".
Note: The production quality level of the precast concrete component factory can be evaluated according to the method specified in Appendix 3 of this standard. Article 2.0.8 Qualified precast concrete components shall be marked, and a "component certificate" shall be issued and delivered to the user unit. Article 2.0.9 After the quality of precast concrete components is inspected, if it does not meet the requirements of this standard, it shall be handled in a timely manner. For components that do not affect the structural performance and installation and use after repair, repair and re-inspection are allowed. The repair method and inspection results shall be recorded and archived. Engineering Construction Standard Full Text Information System
W.bzsoso.coI3
Engineering Construction Standard Full Text Information System
Chapter 3 Mould
(I) Guarantee Items
Article 3.0.1 The formwork and its support must have sufficient strength, rigidity and stability, and unacceptable deformation is strictly prohibited.
Inspection Quantity: 10% of the same type and specification of the steel formwork for external tensioning shall be inspected, but not less than 3 pieces; other formworks shall be inspected piece by piece. Inspection Method: Observation, manual shaking or measurement inspection. The external tensioning steel formwork shall be inspected under the maximum tension state.
(I) Basic Items
The floor used as the bottom formwork, the paved bottom plate and the tire formwork shall be flat and smooth, and shall not have sinking, cracks, sanding or bulging that affect the quality of the component. Inspection Quantity: Inspection piece by piece.
Inspection Method: Observation and measurement inspection.
Article 3.0.3 The gaps of the template should not leak mortar. The embedded parts fixed on the template should be installed firmly.
Inspection quantity: piece by piece inspection.
Inspection method: observation and shaking inspection.
(Sub) allowable deviation items
Article 3.0.4 The deviation of the template size shall comply with the provisions of Table 3.0.4, and its qualified point rate shall be calculated as follows:
nm)×100%
α—qualified point rate,
nw——number of inspection points that do not meet the requirements; n——total number of inspection points.
Engineering 4 Construction Standard Full Text Information System
WEngineering Construction Standard Full Text Information System
Inspection quantity: Newly made templates and templates after overhaul shall be inspected piece by piece; templates used in continuous turnover shall be inspected regularly according to the quality of the components. Acceptance marks shall be made for templates that pass the inspection.
Note: When the size deviation of each template appears in one of the following situations, it should be repaired: ① Checkpoints that exceed the allowable negative deviation value appear; ② Checkpoints that exceed 1.2 times the allowable positive deviation value appear; 3 or more checkpoints that exceed the allowable positive deviation value appear. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Height (thickness)
Lateral bending
Surface flatness
Height difference of panel surface
Inserted reinforcement, pre-processed parts
Center position deviation
Installation hole
Main reinforcement protective layer thickness
Diagonal difference
Design arch
Thin web beam, persimmon Frame
1/1500month≤15
Note: ——Component length (mm)
Engineering 6 Standard Full-text Information System
Allowable deviation and inspection method of template size DeviationWww.bzxZ.net
1/1000month≤15
/1000month15
1/1000month≤151/1500month≤15
1/1500
1 /1500
1/1500month≤15
Measure the two angles with a ruler and take the larger value
Measure one end and the middle with a ruler and take the larger value
Pull the wire and measure the maximum bend with a ruler
Measure with a 2m ruler and a feeler gauge
Measure the longitudinal and transverse centerline positions with a ruler and take the larger value
Measure with a ruler||tt ||Measure the two diagonals with a ruler
Measure at both ends with a leveling ruler
Pull the wire and measure the mid-span with a ruler
W. Engineering Construction Standard Full Text Information System
Chapter 4
Section 1 Raw Materials
(I) Guarantee Items
Article 4.1.1 The varieties, specifications and quality of steel bars, welding rods and embedded parts must meet the design requirements and the current provisions of relevant steel bars and welding rod standards. Inspection method: Check the factory certificate and the factory (field) test report. (I) Basic Items
Article 4.1.2
The steel bars should be straight, and there should be no cracks, oil stains and flaky rust on the surface.
Inspection quantity: Batch inspection.
Inspection method: Observation inspection.
Section 2 Semi-finished products
(I) Guarantee items
Article 4.2.1 The mechanical properties of cold-drawn steel bars and cold-drawn steel wires must comply with the provisions of the current relevant standards.
Inspection method: Check the test report.
Article 4.2.2 The test results of the mechanical properties of steel bar welded joints and welded products must comply with the current relevant regulations on steel bar welding and acceptance. Inspection method: Check the test report of the welding specimen. (I) Basic items
Article 4.2.3
The appearance quality of steel bar and steel wire processing shall comply with the provisions of Table 4.2.3.
Inspection quantity: Inspect batch by batch according to work shift. Inspection method: Observation inspection.
Engineering Construction Standard Full Text Information System2 Articles
The steel bars shall be straight, and the surface shall not have cracks, oil stains and flaky rust.
Inspection quantity: Batch inspection.
Inspection method: Observation inspection.
Section 2 Semi-finished products
(I) Guarantee items
Article 4.2.1 The mechanical properties of cold-drawn steel bars and cold-drawn steel wires must comply with the provisions of the current relevant standards.
Inspection method: Check the test report.
Article 4.2.2 The test results of the mechanical properties of steel bar welded joints and welded products must comply with the current relevant provisions on steel bar welding and acceptance. Inspection method: Check the test report of the welding specimen. (I) Basic items
Article 4.2.3
The appearance quality of steel bar and steel wire processing shall comply with the provisions of Table 4.2.3.
Inspection quantity: Batch inspection according to work shifts. Inspection method: Observation inspection.
Engineering Construction Standard Full Text Information System2 Articles
The steel bars shall be straight, and the surface shall not have cracks, oil stains and flaky rust.
Inspection quantity: Batch inspection.
Inspection method: Observation inspection.
Section 2 Semi-finished products
(I) Guarantee items
Article 4.2.1 The mechanical properties of cold-drawn steel bars and cold-drawn steel wires must comply with the provisions of the current relevant standards.
Inspection method: Check the test report.
Article 4.2.2 The test results of the mechanical properties of steel bar welded joints and welded products must comply with the current relevant provisions on steel bar welding and acceptance. Inspection method: Check the test report of the welding specimen. (I) Basic items
Article 4.2.3
The appearance quality of steel bar and steel wire processing shall comply with the provisions of Table 4.2.3.
Inspection quantity: Batch inspection according to work shifts. Inspection method: Observation inspection.
Engineering Construction Standard Full Text Information System
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.