According to the material properties, it can be divided into building formwork, building veneer, laminated board, multilayer board, double-sided adhesive tape, double-sided laminated building formwork and so on. Building formwork can be divided into cast-in-place concrete formwork, pre-assembled formwork, large formwork and jumping formwork according to construction technology conditions.

The building formwork structure used in the construction of cast-in-place concrete structure is mainly composed of three parts: panel, supporting structure and connector. The panel is a load-bearing plate that directly contacts the newly poured concrete; The supporting structure is a temporary structure to support the panel, concrete and construction load, which ensures that the building formwork structure is firmly combined and does not deform or destroy; Connectors are fittings that connect panels and supporting structures into a whole.

When the concrete pouring of the bottom plate or the top plate is finished and has a certain strength (≥ 1.2MPa), that is, it is not soft and there is no trace by hand, the master can start pouring the shaft. According to the axis position, the dimension line of the section position of the wall column and the control line of the formwork 500 are set out to facilitate the installation and correction of the beam formwork.

After the concrete pouring is finished, after the formwork is dismantled, the 500mm elevation control line of the floor will be putright, and the bottom control line of the slab will be putright directly on the floor according to 500mm line.

Firstly, according to the floor axis measuring hole, the control line of the main axis of the building is measured, and the control line is used as the starting point to lead out the axes. According to the axis and construction drawing, the inside, outside and outside lines of the template are popped up with ink lines. The first three lines must be in place to facilitate the installation and correction of the template.

Extended data

Although formwork is an auxiliary structure, it is very important in concrete construction. In water conservancy projects, the cost of formwork works accounts for 15 ~ 30% of the cost of reinforced concrete structures and 5 ~ 15% of the cost of reinforced concrete, and the labor consumption of formwork production and installation accounts for about 28 ~ 45% of the total consumption of concrete projects.

For projects with complex structures, the time of formwork support and steel binding is much longer than that of concrete pouring, so the design and assembly technology of formwork is an important link that cannot be ignored in concrete construction.

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