how to choose three kinds of building formworkHollow plastic formwork, steel formwork, wood formwork, how to choose three kinds of building formwork
For most people who have building needs, the names of these building templates are like Martian texts
what are they? What are their characteristics?
Building formwork is an important tool for concrete structure engineering construction, and formwork technology directly affects the quality, cost and benefit of engineering construction. Statistics show that in cast-in-place concrete structure engineering, form work generally accounts for 20% to 30% of the cost of concrete structure engineering, 30% to 40% of engineering labor, and about 50% of construction period. On the premise of ensuring the quality of concrete projects, it is a major problem faced by many projects to choose the most economical and reasonable formwork material. This article will take hollow plastic formwork, steel formwork, and wood formwork as the main research objects, hoping to provide advice to you who are struggling with which building formwork to choose.
Wood formwork, as the name suggests, uses wood as the main raw material. The common wooden formwork can be sawed, drilled, and easy to process, and can be arbitrarily processed and shaped according to the specific geometric figures of the components. Low temperature resistance, easy disassembly and assembly, simple operation, fast project progress, easy purchase, and small one-time investment. However, the number of turnovers is not high, generally 3 to 5 times, and waste disposal and stacking occupy a large area, and are prone to delamination and fracture. In humid areas, it is prone to damp, mildew, etc., and has a short service life, especially the consumption of forest resources. If it is used in large quantities, it will cause serious damage to the ecological environment.
Steel formwork, also known as (demolition-free formwork mesh), can replace wood formwork, which can significantly reduce the pore water pressure in the concrete pressure and the elimination of air bubbles. The emergence of steel formwork saves a lot of wood and can be reused many times, with a turnover rate of up to 40 times. Steel formwork is easy to do thermal insulation treatment, which is beneficial to the thermal insulation of concrete in winter. It is easy to maintain, and the partially damaged surface can be repaired on site. When one side is worn out, the board can be turned over for use. But its cost is high, the cost per square meter is hundreds of yuan, far higher than the price of wooden formwork, the formwork has small adsorption force, easy demoulding, and heavy, inconvenient hoisting and disassembly during construction, and the number of splicing blocks in use is time-consuming. It is laborious and only suitable for high-rise buildings with uncomplicated shapes.
Hollow plastic formwork
1. Easy to support and dismantle
It is connected by buckles, and the operation is simple and quick; the surface of the formwork is smooth, it can be automatically demoulded, no cleaning and maintenance is required, and no release agent is required. The surface of the formwork after use does not stick to cement, and the formwork does not need to be cleaned; Comparable steel formwork is 40% higher; compared with bamboo and wood formwork, construction efficiency can be increased by 40%.
2. Easy to assemble and disassemble
With the same building area, the time-consuming hollow building formwork is about 40% less than traditional formwork. The thermal expansion coefficient of the hollow energy-saving building formwork is far different from that of concrete. After pouring, the formwork will automatically separate from the poured concrete as the temperature changes and the concrete solidifies.
3. Easy and safe to carry
The density of the hollow building formwork is 0.4 g/cubic centimeter, which is only 1/21 of that of steel. It is light in weight. A worker can easily hold a formwork of 900 mm × 1800 mm in each hand, and it is very convenient to carry. The template will not deform or absorb water during use, which can greatly improve the construction safety, and its damage rate is less than 1‰.
4. Stable and excellent performance
Using polypropylene resin as the base material, the production is more environmentally friendly. Polypropylene resin (pp granules) is a crystalline polymer with a regular structure. It is a light milky white pellet, odorless, non-toxic, and light-weight thermoplastic resin. It has good mechanical properties, good heat resistance, good chemical stability, and acid resistance. , alkalis and organic solvents. Under the temperature condition of -10°C to 75°C, it does not shrink, does not swell, does not crack, does not deform, and has stable dimensions.
5. Green and environmental protection
The hollow plastic board adopts modern chemical HDPE and HDPP materials, which is a light weight (hollow structure), non-toxic and non-polluting. Substituting plastic for wood, plastic for steel, and plastic for bamboo can be recycled more than 50 times. Recycling will not produce harmful waste or toxic gas, reducing damage to the environment.
6. Strong plasticity
It can be sawed, planed, drilled, nailed, and can be combined with accessories to form any geometric shape at will to meet the needs of various shapes of building components. Since the hollow plastic template adopts a special molding process, any color can be achieved through the color masterbatch, and the surface is smooth and easy to print.
After reading the basic analysis of wood formwork, steel formwork, and hollow plastic formwork, do you already have a general understanding of building formwork? Which building template to choose, I believe you already have a good idea.