Jincheng Prefabricated Assembly House

Jincheng prefabricated assembly houses adopt a construction model of factory-prefabricated components and on-site assembly construction, featuring large-scale application, technical standardization, and environmental efficiency.

I. Large-Scale Application and Development

The prefabricated construction industry in Jincheng has entered a stage of large-scale application. As of the first quarter of 2026, the newly started construction area of prefabricated buildings has reached 1.87 million square meters, accounting for over 39.2% of newly built structures, ranking among the top three in the province for three consecutive years. A typical project is a 25,000-square-meter building in the urban area, with 18 floors above ground and 2 floors underground, adopting an assembled monolithic concrete shear wall structure with an assembly rate of ≥60%. The prefabricated components include shear wall panels (35%) and composite floor slabs (20%), demonstrating a high degree of technological integration.

II. Construction Process and Technical Specifications

1. Construction Preparation

   • Detailed Design: Based on BIM models, component disassembly is completed, with wall panel dimensions controlled at 3.2m × 2.8m (weight ≤ 12t) and composite floor slabs using a 60mm prefabricated layer + 70mm cast-in-place layer. Through a multi-disciplinary collaboration platform, 32 pipeline conflict points are eliminated, and 4 hoisting paths are optimized.
   • Component Storage Area: Divided into three zones for wall panels, floor slabs, and stairs, with a foundation bearing capacity of ≥150kPa, using C25 concrete hardening + 200mm graded gravel cushion. Wall panels are stored upright at an angle of ≥85°, composite slabs are stacked ≤6 layers high, and equipped with 2 QTZ80 tower cranes (coverage radius of 55m).

2. Component Production and Transportation

   • Production Standards: Custom steel molds made of 8mm thick steel plates are used, with an error of ≤0.5mm and a turnover frequency of ≥50 times. The straight thread processing deviation of sleeve-connected rebar is ≤2mm. Steam curing is conducted at a temperature of 60°C ± 5°C and a humidity of ≥90%, ensuring a 7-day strength of ≥85% of the design value.
   • Transportation Requirements: Wall panels are transported upright on racks at an angle of 80° to the ground, with composite slabs spaced 1.5m apart on wooden pads. The vehicle speed is ≤40km/h, with 50mm foam corner protectors attached to component edges and corners, and sleeve ports sealed to a waterproof rating of IP65.

3. On-Site Installation
   The construction sequence is foundation inspection → prefabricated columns → shear wall panels → composite beams → composite floor slabs → stairs → balcony panels, ensuring structural stability and construction efficiency.

III. Architectural Advantages and Environmental Benefits

1. Resource Conservation: Factory prefabrication reduces the need for on-site scaffolding and formwork, lowering labor and material consumption.
2. Shortened Construction Period: Component production is less affected by environmental conditions, and mechanized operations shorten the construction cycle to one-third of traditional methods.
3. Environmental Protection and Emission Reduction: For every 100 square meters, construction waste is reduced by approximately 5 tons, with water savings of 80% (dry construction), energy savings of 70%, material savings of 20%, and land savings of 20%, virtually eliminating sewage, dust, and noise pollution.

IV. Policy Support and Incentives

1. Construction Guarantee During Heavy Pollution Weather: Non-earthwork operations can continue without suspension.
2. Floor Area Ratio Incentives: Prefabricated exterior walls are not included in the building area (not exceeding 3% of the floor area ratio above ±0.00).
3. Pre-sale Permit Optimization: Investment in prefabricated components can be included in the total construction investment, and a pre-sale permit can be applied for when funds reach 25%.