Prefabricated Concrete Houses in Xuancheng City
Xuancheng City has established a comprehensive system for prefabricated concrete houses (prefabricated buildings), encompassing policy guidance, standardized design, rigorous review, quality control, and demonstration leadership, achieving remarkable results.
I. Policy Promotion and Mandatory Requirements
Since December 1, 2023, Xuancheng City has implemented stringent policies: newly constructed public buildings (with a single above-ground floor area ≥ 5,000 square meters) and residential communities (≥ 100,000 square meters) funded by the government or state-owned capital must be constructed using prefabricated technology, with the comprehensive use of prefabricated stairs. The promotion of components such as composite floor slabs and prefabricated balconies is encouraged. For other public buildings (≥ 20,000 square meters) and residential communities (≥ 100,000 square meters), the application of prefabricated technology is actively promoted. This policy has rapidly increased the market share of prefabricated buildings through financial guidance and scale restrictions. From January to July 2023, the newly started construction area of prefabricated buildings in the city reached 2.3115 million square meters, accounting for 46%; the newly completed area was 1.7669 million square meters, accounting for 40%. These data directly reflect the effectiveness of policy promotion.
II. Standardized Design and Mandatory Specifications
Design units are required to clarify prefabricated indicators during the schematic design phase, and the design depth at each stage must comply with the national Regulations on the Preparation Depth of Architectural Engineering Design Documents. For newly constructed residential buildings, concrete prefabricated stairs must be used in principle from the second floor onwards. Their specifications, dimensions, and structures must be selected according to the national standard atlas Prefabricated Reinforced Concrete Slab Stairs (15G367-1) and the Anhui Provincial standard atlas Structural Details of Prefabricated Reinforced Concrete Slab Stairs (Anhui 2023GZ306), ensuring design uniformity and operability.
III. Construction Drawing Review and Quality Assurance
Construction drawing review agencies must strictly review design documents in accordance with national and Anhui Provincial standards for prefabricated buildings, as well as the Technical Review Guidelines issued by the Ministry of Housing and Urban-Rural Development. Since December 1, 2023, projects not designed as required shall not pass the review, preventing non-prefabricated buildings from entering the construction phase at the source. In addition, Xuancheng City conducts special quality inspections on ready-mixed concrete and prefabricated components through a three-tier mechanism of enterprise self-inspections, competent department inspections, and municipal spot checks, covering the entire process of production, transportation, and installation to ensure structural safety.
IV. Demonstration Projects Leading Technological Breakthroughs
The Guangde Science and Innovation Experimental School project, as the first concrete modular stacked frame system building in the country, with a total construction area of 45,000 square meters, adopts the MiC construction technology of China State Construction Hailong, achieving efficient construction with the main structure capped in 100 days and a total construction period of 150 days. The project has a prefabrication rate of 95%, a module reuse rate of 70%, and six buildings have been rated as national AAA-level prefabricated buildings, providing replicable technological paths and management models for the industry.
