Yunnan Prefabricated Concrete House

Yunnan prefabricated concrete houses have significant advantages in terms of earthquake resistance, cost, and industrialization, making them a suitable building form for earthquake-prone areas in Yunnan.

Outstanding Earthquake Resistance Performance

Yunnan prefabricated concrete houses adopt a dual design of "full-frame shear walls + flexible connections", with obvious structural advantages. Their skeletal structures are poured with C35 concrete and built-in with Φ12 - 18 threaded steel bars. Each column is reinforced with 8 steel bars, forming a "steel bar cage" load-bearing system. The lateral stiffness is 6.8 times that of brick-and-mortar structures. The modules are welded with E55 welding rods, and each point can withstand a tensile force of 20 tons. In a rare 9-degree earthquake, the maximum displacement between modules is only 15 cm, and the overall structure remains intact, while the walls of brick-and-mortar structures collapse at a seismic intensity of 5 degrees. In addition, the steel bar mesh acts like a "building spring", absorbing energy through elastic deformation during an earthquake. It can withstand a maximum deformation of 15 cm without breaking, which is 7.5 times the safety threshold of 2 cm for brick-and-mortar structures, truly achieving "no collapse in major earthquakes and repairability in minor earthquakes". The composite steel mesh shear wall structure is formed into a solid whole by splicing double-layer steel mesh sheets on site and then pouring concrete as a whole, with earthquake resistance performance far exceeding that of traditional brick-and-mortar structures.

Significant Cost Advantages

In terms of the main construction cost, the unit price of prefabricated concrete houses is 880 yuan/㎡, which is 10% lower than that of brick-and-mortar structures (980 yuan/㎡), saving 10,000 yuan directly for a 100-㎡ house. In terms of construction period cost, a 100-㎡ house can be built in 15 days, which is 75% shorter than the 60-day construction period of brick-and-mortar structures, and the labor cost is reduced from 15,000 yuan to 8,000 yuan. From the perspective of the whole life cycle, the earthquake-resistant design reduces post-disaster repair costs. The case of Ludian in Yunnan shows that the repair cost of concrete houses is only 300 yuan/㎡, which is 62.5% lower than that of brick-and-mortar houses (800 yuan/㎡). In the event of an extreme earthquake, the reconstruction cost of brick-and-mortar houses may be 2 - 3 times that of concrete houses. Moreover, governments in high-intensity areas such as Sichuan, Yunnan, and Gansu provide subsidies of up to 50,000 yuan per household, further narrowing the price gap with brick-and-mortar houses.

Remarkable Industrialization Advantages

In terms of standardized production, the precision of factory molds is controlled within ±1.5 cm, and the steel bar spacing and concrete mix ratio are monitored automatically throughout the process, eliminating the strength fluctuations caused by manual mixing. The dry construction revolution eliminates wet operations on site, with hoisting completed in 1 - 2 days and pipeline embedding completed in 4 days. The composite steel mesh shear wall structure adopts a "factory prefabrication + on-site assembly" model, which can shorten the main construction period by more than 50%.