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There are many ways to classify formwork, which are usually classified in the following ways: (1) According to different materials, it can be divided into wood formwork, steel formwork, plywood formwork, steel-wood formwork, plastic formwork, steel and bamboo mold concrete structure construction effect display 39 boards, aluminum alloy formwork, etc.
2) According to different structural types, it can be divided into foundation formwork, column formwork, floor formwork, wall formwork, shell formwork and chimney formwork.
3) According to the different forms and construction techniques of the formwork, it can be divided into integral formwork, shaping formwork, tool-type formwork, sliding template, tire mold, etc.
4) According to different construction methods, it can be divided into on-site assembly and disassembly formwork, fixed formwork and mobile formwork.
5) According to the different functions of the formwork, it can be divided into ordinary forming formwork and fair-faced concrete.
Forming formwork, decorative concrete forming formwork with decorative stripes and patterns, permanent formwork as a structural component and formwork with internal and external insulation layers that are not dismantled.
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The types of formwork commonly used in construction projects are as follows:
1.Wood formwork: Wood formwork is the more common and traditional building formwork, usually made of wood, such as plywood, solid wood boards, etc. Wood formwork has good bearing capacity and adaptability, and is suitable for various types of building structures.
2.Steel formwork: The steel formwork is made of steel, which has high strength and stability, and is suitable for the construction of large-span, high-rise buildings and special structures. The steel formwork can be reused to improve the construction efficiency.
3.Aluminum alloy formwork: Aluminum alloy formwork is made of aluminum alloy material, which has the characteristics of lightweight, durable, easy to disassemble and efficient. Aluminum alloy formwork is suitable for the construction of small and medium-sized buildings and residential projects.
4.Clear water template: Clear water template is a high-end plywood product, clear water template process is complex, the material uses high-end poplar birch, clear water template surface is very smooth and flat, and there are many advantages in the application, mostly used in high-rise buildings, or used in shear walls.
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1. Classification by material.
According to the different materials used, the formwork is divided into wood formwork, steel wood formwork, steel formwork, steel bamboo formwork, plywood formwork, plastic formwork, glass fiber reinforced plastic formwork, aluminum alloy formwork, etc.
2. Classification according to structure type.
All kinds of cast-in-situ reinforced concrete structural components, due to their different shapes, sizes, structures, the structure and assembly methods of the formwork are also different, forming their own characteristics. According to the type of structure formwork, it is divided into: foundation formwork, column formwork, beam formwork, floor formwork, stair formwork, wall formwork, shell formwork, chimney formwork and so on.
3. Classification according to construction methods.
1. On-site assembly and disassembly formwork. The formwork assembled on site according to the structural shape, size and spatial location required by the design at the construction site, and the formwork is removed after the concrete reaches the demoulding strength. The on-site assembly and disassembly formwork is mostly supported by shaped formwork and tool-type support.
2. Fixed formwork. Templates for making prefabricated components. According to the shape and size of the component, the template is made on site or in a prefabricated factory. All kinds of tire molds (soil tire molds, brick tire molds, concrete tire molds) are fixed templates.
3. Mobile template. With the pouring of concrete, the formwork can move in the vertical or horizontal direction, which is called mobile formwork. Such as chimneys, water towers, wall columns when pouring concrete, the sliding formwork used when pouring, the lifting formwork and the horizontal mobile formwork used when pouring concrete in the cylinder shell, etc.
A template is a fixed format for drawing or designing, and sometimes the nucleotide sequence used to produce complementary strands during DNA replication or transcription. Column. The template is the result of fixing and standardizing the structural law of a thing, and it reflects the standardization of the structural form.
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According to the nature of the material, it can be divided into building formwork, building wood plywood, laminated board, multi-layer board, double-sided laminated building formwork, etc. According to the construction process conditions, the building formwork can be divided into cast-in-place concrete formwork, pre-assembled formwork, large formwork, jumping formwork, etc.
The building formwork structure used in the construction of cast-in-place concrete structure engineering is mainly composed of three parts: panel, support structure and connector. The panel is a load-bearing plate that is in direct contact with the freshly poured concrete; The supporting structure is a temporary structure that supports the panel, concrete and construction load, ensuring that the building formwork structure is firmly combined and not deformed or damaged; A connector is an accessory that connects the panel with the support structure as a whole.
When the concrete of the bottom plate or roof is poured and has a certain strength (i.e., it is not soft and has no traces when pressed by hand, the master can start to measure the axis. According to the axis position, the wall column section position dimension line and the template 500 control line are released to facilitate the installation and correction of the beam template.
When the concrete is poured and the formwork is removed, the 500mm elevation control line of the floor is introduced, and the control line of the bottom of the slab is directly tested according to the 500mm line.
Firstly, the control line of the main axis of the building is guided according to the floor axis measuring hole, and the control line is taken as the starting point, each axis is drawn out, and the inner line, the edge line and the outer control line of the template are ejected with ink lines according to the axis and the construction drawing, and the three lines must be in place before construction, so as to facilitate the installation and correction of the template.
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1) Maintain the position size and geometry of the design to be hardened into a reinforced concrete structure.
or the model of the component.
2) Basic requirements for formwork and its support:
1) There is sufficient bearing capacity, stiffness and stability, and the stove can reliably bear the gravity hidden history, lateral pressure and construction load of pouring concrete;
2) Ensure the correctness of the shape, size and mutual position of each part of the engineering structure and components;
3) The structure is simple, the assembly and disassembly are convenient, and it is convenient for the binding and installation of steel bars, the pouring and maintenance of concrete and other process requirements;
4) The joints are tight and must not leak slurry.
3) according to the different types of its structural components, it is divided into basic formwork, column formwork, floor formwork, wall formwork, shell formwork and chimney formwork, etc.; According to its different forms, it is divided into integral template, shaping template, tool template, sliding template, tire mold, etc.
4) The characteristics are:
1) The characteristic of the column is that the cross-sectional size is not large but relatively high.
2) The beam is characterized by a large span and a small width, and the bottom of the beam is generally overhead.
3) The floor slab is characterized by a large area and a relatively thin thickness, and low lateral pressure.
5) Scope of application, formwork support of on-site reinforced concrete components.
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