Municipal (prefecture) housing urban and rural construction administrative departments:
In order to implement the Work Plan for Accelerating the Transformation of the Development Mode of the Construction Industry and Promoting the Construction of a Strong Province jointly issued by the Department of Housing and Urban-Rural Development and other six departments，Continue to deepen and improve the development quality of prefabricated buildings for five years，Efforts were made to strengthen the quality and safety management of prefabricated buildings，Improve the development efficiency of prefabricated buildings，We will promote the coordinated development of smart construction and building industrialization，The relevant matters are hereby notified as follows。
First, improve the level of prefabricated building design
(1) Strengthening design management。Prefabricated building construction drawing design documents should be prepared "prefabricated building design Instructions", detailed and clear assembly rate implementation and technical measures。The design of construction drawings should consider the related professional requirements of architecture, structure, electrical and mechanical, decoration, etc., and meet the needs of component production, transportation and construction。Encourage and support design units to use building information modeling (BIM) to carry out professional design, analysis and optimization。Prefabricated residential buildings
In the design, the proportion of four types of standard components, such as laminated board, stairs, bay window and shear wall, should be increased, and strive to be greater than 60%;In the design of prefabricated public buildings and industrial buildings, the use of pipeline separation technology should be fully implemented。For concrete buildings with assembly rate greater than 60% or steel structures with assembly rate greater than 75%，The construction unit shall organize experts to demonstrate the rationality, feasibility and economy of the design scheme，Design units should strengthen the whole process tracking service，The design of prefabricated building components involving structural safety shall not be subcontracted to other units。
(2) Strict review of construction drawings。The construction unit shall provide the design documents that meet the requirements of the design depth of the prefabricated building，The construction drawing examination institution shall comply with the relevant national and provincial regulations such as "Evaluation Standards for prefabricated Buildings" (GB/T51129), "Key points for Review of the design documents of the prefabricated concrete Structure Building Engineering in Sichuan Province (Trial)", "Key points for review of the design documents of the prefabricated Steel Structure Building Engineering in Sichuan Province (trial)" and "Rules for Calculating the assembly rate of the prefabricated building in Sichuan Province"Conduct a review。For the later special design involving the assembly rate (such as decoration, etc.), the construction unit should provide the assembly rate design commitment letter to the examination body, and the design change involving the assembly rate change is in principle reviewed by the original examination body。
3. Promoting the use of new technologies。Encourage enterprises to promote the use of new technologies，There is no technical system of national standards, industry standards or local standards of Sichuan Province for engineering construction，Measures for the Promotion and Application of New Technologies in the Field of Housing and Urban and Rural Construction of Sichuan Province shall be followed，The Department of Housing and Urban-Rural Development organized engineering experts to conduct technical demonstration，Clarify whether the technology is suitable for the project and meet the relevant requirements，Argumentation opinions as the basis of project design。
Second, strengthen component production quality control
Component production enterprises should effectively improve component production quality assurance ability in accordance with the relevant requirements of the "Sichuan Province prefabricated building Parts Production quality Assurance Ability" and "Guiding Opinions on Promoting the high-quality Development of Sichuan Province prefabricated Building Industrial Parts Industry"。To establish the quality traceability system of the whole process of component production, the standard component should be produced according to the standard atlas, and the enterprise product standards should be formulated.Custom structural components shall be produced in accordance with relevant technical standards and design requirements。When the concrete structural members leave the factory, the quality certificate and the reinspection report or material certificate of the main materials such as steel bars, sleeves, grouting materials and hangings, the 28-day strength test report under standard maintenance conditions and the type inspection report of the members shall be provided。When the steel structure components leave the factory, the quality certificate and the certificate of the main materials such as steel, welding materials and bolts should be provided, and the test report according to the standard requirements。
Third, strengthen the construction process quality control
(1) Standardize the entry and acceptance of components。Construction, construction and supervision units should be in accordance with the "steel structure engineering construction quality acceptance standards" (GB50205), "Building industrialization concrete precast components production, installation and quality acceptance procedures" (DBJ51/T008) and other standards，Organize quality inspection by component entry batch，Verify the type inspection report of sleeve grouting joint products and the performance reinspection report of grouting materials provided by the manufacturer。If the design document does not explicitly require the inspection of the component, the structural performance inspection of the concrete component may not be carried out after the concrete component enters the field, but the physical inspection of the component must be carried out。
(2) Strengthen the control of construction links。The construction unit shall establish and improve the quality and safety guarantee system, and formulate internal quality management systems such as the entry and acceptance of prefabricated components, the quality control of node connections, and the trial installation and acceptance of the first floor or the first representative construction section。According to the construction drawing design (including prefabricated component deepening design) documents and related standard requirements of prefabricated building, prepare construction organization design documents covering construction plan, prefabricated component stacking, installation, node connection, component support, etc。It is necessary to focus on the preparation of special construction plans such as the support mode of prefabricated components, the installation of the first layer or the first representative construction section, and formulate specific plans for the grouting construction links of vertical component sleeves, and clarify the grouting technical standards, processes, processes and key positions。The construction unit shall organize the sleeve grouting operators to carry out skill training and assessment。In the construction process, the grouting material matching the sleeve must be used, and the construction can be carried out under the corresponding operating environmental conditions, and the performance of the specimens on site should be tested according to the process flow。
(3) Strengthen the supervision responsibility of supervision units。The supervision unit shall, according to the design documents and relevant standards, prepare special supervision implementation rules, clarify the specific requirements of key links, key parts, witness sampling and side stations, and implement them after the approval of the construction unit。It is important to check the technical disclosure of the construction management personnel on the key processes such as the hoisting of prefabricated components and the joint connection。It is necessary to strengthen the implementation of side supervision of key processes, key positions and grouting construction process, such as the installation of the first layer or the first representative construction section, the joint connection of prefabricated structural components and the connection of cast-in-place structures。It is necessary to carry out key inspection for the sealing and waterproof construction of the external enclosure of the prefabricated components, accept and inspect the concealed installation of the batch and prefabricated components, and form a record。The concealed construction of all key nodes and key parts shall be carried out by holding up a sign for acceptance。
(4) Standardize the conduct of completion acceptance。The construction unit shall promptly organize the design, construction, supervision and other responsible entities to carry out the project completion acceptance, conduct a comprehensive inspection of the project entity, and form a four-party conclusion and opinion inspection report。The main inspection is whether the project meets the design standards of prefabricated buildings and the design requirements of assembly rate, whether the project contents agreed in the contract are completed, whether the technical files are complete, whether the construction management data are standardized, and whether the approach experiment report of the main building materials, building components and equipment meets the completion acceptance conditions。
Fourth, improve the quality and efficiency of construction supervision
(1) Strict construction quality supervision。Local engineering quality supervision and management departments should conscientiously fulfill the responsibility of quality supervision and management of prefabricated construction projects。Before the process supervision, it is necessary to disclose the supervision work. During the process supervision, it is necessary to strengthen the supervision of the performance of the quality main responsibility of the construction, design, construction, supervision and other units, as well as the supervision of the quality of the quality management process, spot check the quality of the pre-fabricated components, as well as the quality of the engineering entity structure and quality control data。In the specific implementation, it is necessary to focus on the supervision of the quality acceptance of each link of the main branch (sub-branch) project, the organizational form and procedure of the completion acceptance of the responsible main unit and whether the acceptance standards comply with the relevant provisions and whether the acceptance conclusions are clear, and form supervision opinions。Found quality problems shall be ordered to rectify within a time limit, and investigated according to law and regulations。
2. Improving quality supervision。Local engineering quality supervision and management departments should make full use of "Internet + smart supervision" and other means，Build a good "smart site" platform，Collect basic information of prefabricated building projects and carry out regular quality and safety data analysis，Improve the supervision of construction projects，Urge all responsible entities to strengthen the whole process management of project quality construction。It is necessary to constantly innovate supervision methods and methods, including mechanical operation status, personnel safety behavior and training, engineering data transmission and archiving, and system standard implementation into the scope of information supervision, and improve the intelligent and digital level of the whole process of quality supervision of prefabricated buildings。
Sichuan Department of Housing and Urban-Rural Development
September 12, 2023
