1. Classification of construction quality acceptance levels

2 Purpose of dividing construction quality acceptance levels

1 The construction site has a sound management system, corresponding construction technical standards, construction quality inspection system and comprehensive construction quality level assessment and assessment system 2 For construction projects that are not supervised, construction-related personnel should perform supervision responsibilities related to the relevant acceptance standards. 3 Construction quality control of construction projects shall comply with the following regulations: Material inspection, process quality control, and important procedures must be inspected and approved by professional supervision engineers before proceeding to the next step.

4 The number of re-inspections and tests shall be appropriately adjusted according to the acceptance specifications. The adjusted sampling re-inspection and test plans shall be prepared by the construction unit and submitted to the supervisor for review and confirmation: Multiple unit projects of the same construction unit in the same project use the same manufacturer, the same variety and the same batch of materials, components and equipment The finished products, semi-finished products, and components of the same construction unit are used in multiple units of the same project. In the same project, existing inspection results for the same sampling object can be reused.

5. When there are no provisions for professional acceptance specifications, the construction unit shall organize supervision, design and construction and other relevant units to formulate special acceptance requirements. Special acceptance requirements for projects involving safety, energy conservation and environmental protection should be demonstrated by experts organized by the construction unit.

6 The construction quality of construction projects shall be inspected and accepted according to the following requirements: Project construction quality acceptance shall be carried out on the basis of qualified self-inspection by the construction unit. Personnel from all parties involved in project construction quality acceptance should have corresponding qualifications The quality of the inspection batch is accepted according to the main control items and general items Test blocks, specimens and materials involving structural safety, energy saving, environmental protection and main functions shall be witnessed and inspected as required when entering the site or during construction. Before the acceptance of concealed projects, the construction unit shall notify the supervision agency to conduct acceptance and form an acceptance document. Construction can only continue after passing the acceptance. For important sub-projects involving structural safety, energy saving, environmental protection and use functions, sampling inspection shall be carried out according to regulations before acceptance. The quality of project acceptance shall be inspected on-site by the acceptance personnel and shall be confirmed jointly

7 The construction quality project acceptance shall meet the following requirements: Comply with engineering survey and design requirements Comply with specification requirements

8 Quality inspection and extraction plan for inspection batches: Measurement, Counting and Measurement-Counting Sampling Plans Once, twice, many times Important inspections, easy and fast, all inspections Adopt an adjusted sampling plan based on production continuity and production control stability. Proven effective sampling plan

9 The samples for the inspection batch should be randomly selected to meet the requirements of even distribution and representativeness, and the sampling quantity should comply with the relevant professional acceptance specifications.

10 The probability of misjudgment α and probability of missed determination β in measurement sampling can be adopted according to the following provisions: Main control: Both α and β of qualified quality level should not exceed 5% Generally: α should not exceed 5%, β should not exceed 10% Misjudgment α refers to the probability that a qualified batch is judged to be a failed batch, that is, the probability that a qualified batch is rejected Missing judgment β refers to the probability of an unqualified batch being judged as a qualified batch, and the probability of an unqualified batch being rejected.

1 Inspection batch quality acceptance

2 Quality acceptance of concealed projects

3 Sub-project quality acceptance

4 Branch project quality acceptance

5 Unit project quality acceptance

1. Inspection batches that have been reworked or repaired shall be re-accepted. 2. Inspection batches that can meet the design requirements after being tested and identified by a qualified testing agency will be accepted. 3. If the inspection and appraisal by a qualified testing agency fails to meet the design requirements, and the inspection batch is approved by the original design unit and can meet the safety and functional functions, it can be accepted. 4. When the sub-projects and sub-projects that have been repaired or reinforced meet the safety and functional requirements, they will be accepted according to the requirements of the technical treatment plan and negotiation documents. 5. Branch projects and unit projects that cannot meet safety or important usage requirements after repair or reinforcement are strictly prohibited from acceptance. 6. Project quality control information should be complete and complete

warranty period: 1 For infrastructure, building foundations and main structure projects, the reasonable service life specified in the design documents 2. Roof waterproofing projects, bathrooms, rooms and exterior walls that require waterproofing to prevent leakage. 5 years 3 heating and cooling, 2 heating periods and cooling periods 4 Electrical pipelines, water supply and drainage pipelines, equipment installation and decoration projects, 2 years The warranty period of a construction project is calculated from the date of completion acceptance

The defect liability period is generally 1 year, with a maximum of 2 years; The deposit ratio shall not be higher than 3% of the total project settlement amount; Before the completion of the project, if the contractor has paid a performance bond, the developer shall not reserve a project quality deposit at the same time; if other guarantee methods such as project quality guarantee guarantee, project quality insurance, etc. are used, the contractor shall not reserve a quality deposit.

--Regular return visits--Solicit opinions from the construction unit or user unit in a timely manner --Coordination and contact--the construction or user unit raises defects, supervises inspection records, and issues warranty notices --Defining responsibilities--The supervision unit organizes relevant units to define responsibilities for quality defects --Supervise maintenance--The construction unit shall supervise the repair process of quality defects and the supervision unit shall sign and approve it after passing the inspection. --Inspection and Acceptance--After the construction unit completes the warranty and passes the inspection and acceptance by the supervision unit, the construction unit or project owner shall organize the acceptance inspection. If it involves structural safety, it shall be reported to the local construction administrative department for record.