The advantages of aluminum alloy formworks are increasingly recognized by more people. Aluminum alloy formworks can be recycled 150 times and are suitable for high-rise buildings to replace soft formworks.
The high stiffness and strong bearing capacity of the aluminum alloy formwork system make the building structure more stable. The construction scale accuracy and concrete forming qualification rate of the buildings constructed using this system exceed the national standards. The innovative formwork design simplifies the construction difficulty. The assembly and disassembly of the formwork and components are simple and convenient, which improves construction efficiency and reduces labor costs.
The high turnover rate of the aluminum alloy building formwork system can reach 300 times. Compared with the traditional wood formwork system, the use of aluminum alloy formworks and 100 turnovers of buildings can reduce labor hours and save costs. It also significantly reduces the use of building materials such as river sand, wood, and cement, as well as the generation of construction waste, achieving energy-saving and emission reduction effects.
The aluminum alloy formwork system has high economic benefits by simplifying the construction difficulty, improving construction efficiency, and reducing labor costs. The system has a high qualification rate for concrete forming, and the construction effect is obvious, which then reduces the thickness of the decoration and plastering layer. Compared with traditional building formwork systems, it has significant economic advantages. Therefore, more and more construction projects are now using aluminum alloy formworks.
Structural deformation phenomenon
After disassembling the aluminum alloy formwork, it is found that the concrete columns, beams, and walls present bulging, constriction or warping phenomena.
The support and surrounding purlin distances are too large, and the formwork stiffness is poor. The connection components are not set according to the regulations, resulting in poor overall integrity of the formwork. The wall formwork has no pull bolt or the bolt distance is too large, and the bolt specification is too small. The support between the molds in the door and window openings is not firm and is easily displaced when the concrete is vibrated. The distance between the beam and column formwork clamps is too large, or the formwork is not clamped or equipped with insufficient pull bolts, so that some aluminum alloy formworks cannot withstand the lateral pressure that occurs during concrete vibration, resulting in some bursting of the molds. The pouring speed of wall and column concrete is too fast, the irrigation height is too high, and the vibration is excessive.
Prevention and treatment measures
When designing aluminum alloy formworks and support systems, their own weight, construction load, the weight of concrete, and the lateral pressure that occurs during pouring and vibrating of the concrete should be fully considered to ensure that the aluminum alloy formworks and supports have sufficient bearing performance, stiffness, and stability.
The distance of the bottom support of the beam should ensure that there is no deformation under the effect of the weight of the concrete and the construction load. The top of the beam and wall template must have temporary supports to ensure the width of the beam and wall openings during concrete pouring. When pouring concrete, it should be uniformly symmetrical and not underfilled. The irrigation height should be strictly controlled, especially on both sides of the door and window opening template, to ensure concrete compaction and avoid over-vibration deformation of aluminum alloy templates.