Why are alloy steel formworks for exterior wall formwork more resistant to deformation in high-rise building exterior wall construction?
Publish Time: 2025-09-25
With the increasing number of high-rise and super-high-rise buildings in modern urbanization, their complex structures, immense loads, and demanding construction precision pose unprecedented challenges to building formwork systems. As the building's outer envelope, exterior walls not only form concrete but also withstand immense lateral pressure, vibration, and construction loads. Against this backdrop, traditional wood or plywood formwork, due to their low strength, susceptibility to water absorption and expansion, and limited turnover, cannot meet the high-standard construction requirements. However, alloy steel formworks for exterior wall formwork, with their superior material properties and structural design, demonstrate remarkable resistance to deformation in high-rise building exterior wall construction, becoming a key component for ensuring project quality and improving construction efficiency.
1. High-strength materials lay the foundation for deformation resistance
The core advantage of alloy steel formwork stems primarily from its inherent high strength. Compared to wood or ordinary steel, the alloy steel or aircraft-grade aluminum alloys used in exterior wall formwork possess significantly higher yield strength and tensile strength. This high strength ensures that the formwork maintains structural stability despite the significant lateral pressure generated during concrete pouring, preventing bending, twisting, or localized dents. Even in large-span, unsupported, or cantilevered structures, alloy steel formwork effectively withstands loads, ensuring precise wall geometry and avoiding common quality defects such as bulging and bulging.
Beyond the material itself, alloy steel formwork typically utilizes a modular, standardized design, enhancing overall rigidity through stiffeners, transverse and longitudinal beams, and connecting flanges. The formwork panels are welded or bolted to the back rib system, forming a stable "frame-panel" load-bearing system. This rigid structure evenly transfers localized concentrated loads throughout the formwork unit and distributes them to adjacent formwork or supporting frames through connection points, effectively preventing localized deformation caused by stress concentration. Furthermore, the joints between formwork panels utilize precise tongue-and-groove or pin connections to ensure tight and smooth joints, preventing leakage and deformation caused by misalignment or looseness.
3. Excellent thermal stability and adaptability to complex environments
High-rise building construction requires long periods of time, and formwork is exposed to harsh environments such as sun, rain, and temperature fluctuations. Wood is susceptible to expansion, contraction, and warping due to humidity fluctuations, while ordinary steel plates can also undergo slight deformations at high temperatures. Alloy steel formwork offers excellent thermal stability and weather resistance. Its low coefficient of linear expansion allows it to maintain dimensional stability even under large temperature swings between day and night, preventing deformation or cracking due to thermal expansion and contraction. This is crucial for ensuring the verticality and flatness of exterior walls, especially in regions with high summer temperatures or severe winters, where the stability advantages of alloy steel formwork are particularly pronounced.
Modern alloy steel formwork is often produced using CNC cutting, automated welding, and precision machining processes, ensuring that each formwork piece has a dimensional tolerance within millimeters. This high-precision manufacturing not only improves assembly efficiency but also reduces the risk of initial deformation caused by unevenness or dimensional deviations in the formwork itself. Alloy steel formwork maintains its factory-proven precision even after repeated use, while wooden formwork rapidly deteriorates and loses its original shape due to repeated disassembly and assembly, moisture corrosion, and other factors.
5. Reusable and Stable Long-Term Performance
Alloy steel formwork is designed for a long lifespan, with standard models capable of over 200 cycles, far exceeding the 5–10 cycles of wooden formwork. Its mechanical properties degrade slowly over long-term use, maintaining a high level of deformation resistance. In contrast, wooden formwork can delaminate, peel, and break at the edges after just a few uses, resulting in a loss of rigidity and a high risk of deformation during subsequent pours.
Exterior wall formwork alloy steel formwork offers superior deformation resistance in high-rise building construction due to its high-strength material, rigid structural design, excellent thermal stability, high-precision manufacturing process, and long service life. It can not only safely withstand the immense lateral pressure of concrete in high-rise buildings, but also ensure that the exterior wall forming quality meets the high standards of "plaster-free" or "finely finished base."
