The building formwork is a temporary supporting structure. It is produced according to design requirements, so that the concrete structure and components are shaped according to the specified position and geometric size, maintain its correct position, and bear the self-weight of the building formwork and external loads acting on it. The purpose of the formwork project is to ensure the quality and safety of the concrete project, speed up the construction progress and reduce the cost of the project.
The building formwork structure used for the construction of cast-in-place concrete structures is mainly composed of three parts: panel, support structure and connecting parts. The panel is a bearing plate directly contacting the newly poured concrete; the supporting structure is a temporary structure supporting the panel, the concrete and the construction load, ensuring that the building formwork structure is firmly combined so as not to be deformed or damaged; the connecting piece is the panel and the supporting The structure is connected into an integral fitting.
The building formwork is a formwork and bracket for concrete pouring. According to the nature of the material, it can be divided into building formwork, construction wood glue board, laminated board, multi-layer board, double-sided compound glue, double-sided film building formwork and so on. According to the construction process conditions, the building formwork can be divided into cast-in-place concrete formwork, pre-assembled formwork, large formwork, jump formwork and so on. The combined steel formwork is a new type of template that uses the advantages of strong versatility, convenient assembly and disassembly, and many turnover times. It is used for the construction of cast-in-place reinforced concrete structures. According to the design requirements, the large-scale formwork of beams, columns, walls and floors is assembled, and the whole lifting is in place, and the bulk disassembly method can also be adopted.
Aluminum formwork, new building formwork made of aluminum alloy, and green construction formwork emerging in the construction industry. They are easy to operate, fast in construction, high in return, environmentally friendly and energy-saving, many times used, good concrete pouring effect, and recyclable. Company adopted. On November 27, 2014, at the "Expanding Aluminum Application in the Construction Industry High-level Forum", it was proposed to expand the application of aluminum formwork, focus on promoting aluminum formwork, and implement the aluminum formwork construction standards as soon as possible.
How to choose the right material
In the construction industry, every small nuance may lead to the failure of the entire engineering project. The building formwork is also an important part. The correct method for selecting the building formwork is as follows:
1. The construction of beam-column structures should adopt medium-sized composite building templates. Because beams and columns have many changes in section, it is not suitable to cut with multi-layer boards, so it is suitable.
2. The wall formwork can be used as a medium-sized composite building template. Due to the uniform requirements of high-rise building groups of the same type, the medium-sized composite building template helps ensure a high turnover rate.
3. The core tube of super high-rise or high-rise building should adopt "hydraulic climbing formwork". The climbing formwork technology combines the advantages of large formwork and sliding formwork. It can rise layer by layer with the construction of the structure, and the construction speed is faster, saving space and Tower cranes are safe for high-altitude operations without external scaffolding. In terms of construction, they are especially suitable for the construction of concrete inner cylinders of steel structures.
4. The floor slab building template is recommended to use a whole multi-layer board, and as far as possible, a 15 to 18 MM thick multi-layer building template with phenolic covering is used. After this kind of building formwork has been used for many times, the edges are damaged. It is necessary to cut in time to ensure that the edges of the multilayer boards are flat.