GB 50300-2013Unified standard for constructional quality acceptance of building engineering (English PDF)

1.0.1 This Standard is prepared to strengthen the construction quality management, unify

the construction quality acceptance of building work and guarantee the work quality.

1.0.2 This standard is applicable to the acceptance of building construction quality and serves as unified criteria for laying down the acceptance specifications of various construction disciplines.

1.0.3 The acceptance of building construction quality shall not only comply with this Standard but the current relevant standards of the nation.

2.0.1 Building work

It refers to the work entity formed through construction of various buildings and their auxiliary facilities, and installation of their supporting systems like cabling, piping and M&E equipment.

2.0.2 Testing

It refers to the activity in which the features and performances of the inspected item are measured, inspected and tested, and the results are compared with the requirements specified in standards so as to verify the acceptance of each performance.

2.0.3 Site testing

It refers to the activity to test the building materials, members and accessories, equipment and tools on construction site according to the requirements of relevant standards and to verify the compliance of their quality, specifications and models.

2.0.6 Inspection lot

It refers to the testing body which consists of a quantity of the samples collected for testing by the same production conditions or required method.

2.0.12 Inspection by variables

It refers to the inspection method in which the overall mean, characteristic or estimated value is calculated from the testing data of samples and the overall quality is then judged or assessed.

2.0.13 Probability of misjudgement

It refers to the probability, expressed by alpha, which the acceptable lot is judged as rejectable lot, i.e. the probability of rejecting acceptable lot.

2.0.14 Probability of omission

It refers to the probability, expressed by beta, which the rejectable lot is judged as acceptable lot, i.e. the probability of accepting rejectable lot.

4.0.4 Sub-item project may be divided by main work type, material, construction process

and equipment type.

4.0.5 Inspection lot may be divided by the work quantity, story, construction section and deformation joint as required by the construction, quality control and discipline acceptance.

4.0.8 For outdoor works, the division of subunit project, part project and sub-item project may be performed on the basis of the discipline and work scale and in accordance with Appendix C of this Standard.

6.0.1 Acceptance of inspection lot shall be carried out by professional project quality

inspector and professional foreman, etc. from construction unit and organized by professional supervision engineer.

6.0.2 Acceptance of sub-item project shall be carried out by professional technical director

from construction unit and organized by the professional supervision engineer.

6.0.4 After the completion of subcontract project in unit projects, the subcontractor shall

carry out self-inspection for the contracted project and conduct acceptance inspection according to the procedure specified in this Standard.

6.0.5 After the completion of unit project, construction unit shall organize relevant

personnel to conduct self-inspection. General supervision engineer shall organize supervision engineers from various professions to conduct completion pre-acceptance for the work quality.