How to choose concrete formwork?

Building formwork is an important tool for the construction of concrete structure projects. Formwork technology directly affects the quality, cost and efficiency of project construction. Statistics show that in cast-in-site concrete structure projects, the formwork project generally accounts for 20% to 30% of the cost of the concrete structure project, 30% to 40% of the project workload, and about 50% of the construction period. On the premise of ensuring the quality of concrete projects, choosing the most economical and reasonable formwork material is a major problem faced by many projects. This article will take hollow plastic formwork, steel formwork, and wooden formwork as the main research objects. I hope it can provide suggestions to you who are struggling with which building formwork to choose.

Wood formwork, as the name suggested, uses wood as the main raw material. Common wooden formwork can be sawed, drilled, and easy to process. It can be arbitrarily processed and shaped according to the specific geometry of the components. Low temperature resistance, easy disassembly and assembly, simple operation, speed up project progress, easy to purchase, and small one-time investment. However, the number of turnovers is not high, usually 3 to 5 times. Waste disposal and stacking occupy a large area and are prone to delamination and breakage. In humid areas, it is easy to get damp, mildew, etc., and has a short service life. In particular, it consumes a lot of forest resources. If used in large quantities, it will cause serious damage to the ecological environment.

Steel formwork, also known as (disassembly-free formwork net), can replace wooden formwork, which significantly reduces the pore water pressure and the elimination of air bubbles in concrete pressure. 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 perform thermal insulation treatment, which is beneficial to the 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, the board can be turned over for use. However, its cost is high, with the cost per square meter reaching hundreds of yuan, which is much higher than the price of wooden formwork. The formwork has small adsorption force, easy demoulding, and is bulky. It is inconvenient to hoist during construction and difficult to disassemble. There are many splicing pieces during use, which is time-consuming. It is laborious and only suitable for high-rise buildings with uncomplicated shapes.

Hollow plastic template:

1.Easy to install and disassemble

Connected with buckles, the operation is simple and fast; the surface of the formwork is smooth, automatic demoulding, no cleaning and maintenance, no release agent required, no cement will stick to the surface of the formwork after use, and the formwork does not need to be cleaned; under the same workload conditions, the construction efficiency is higher if compared with steel formwork, the construction efficiency can be increased by 40%.

2.Easy to assemble and disassemble

For the same building area, hollow building formwork saves about 40% of the time compared to traditional formwork. The thermal expansion coefficient of the hollow energy-saving building formwork is very different from that of concrete. After pouring, as the temperature changes and the concrete solidifies, the formwork automatically separates from the poured concrete and can be easily removed, which greatly saves operating time.

3.Convenient and safe to transport

The weight of Hollow building formwork is very light if compared with steel. A worker can easily hold a 900 mm × 1800 mm formwork in each hand, making it easy to transport. The formwork will not deform or absorb water during use, which can greatly improve 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 particles) is a crystalline polymer with a regular structure. It is odorless, non-toxic, and lightweight thermoplastic resin. It has good mechanical properties, good heat resistance, good chemical stability, and acid resistance. , bases and organic solvents. Under the temperature conditions of -10℃ to 75℃, it will not shrink, not swell when wet, will not crack, will not deform, and is dimensionally stable.

5.Green and environmentally friendly

The hollow plastic board is made of modern chemical HDPE and HDPP materials, which is light weight (hollow structure), non-toxic and pollution-free. Using plastic instead of wood, plastic instead of steel, and plastic instead of bamboo can be recycled at least 50 times. Recycling will not produce harmful waste or toxic gases, reducing the damage to the environment.

6.Strong plasticity

It can be sawed, planed, drilled and nailed, and can be used with accessories to form any geometric shape to meet the formwork needs of building components of various shapes.

After reading the basic analysis of wooden formwork, steel formwork, and hollow plastic formwork, do you already have a general understanding of building formwork? I believe you already have an idea of which building template to choose.