Industrialized vertical formwork has become a common part of the construction process on on-site concrete structures. They allow fast and well-defined production cycles, guaranteeing greater safety for operators during assembly, concreting and stripping than traditional formwork.
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Doubts or questions may arise during its use. Its use is simple, but some technical aspects must be taken into account.
Let&#;s analyze the 10 most-frequently asked questions about wall formwork!
1.- What is the maximum admissible filling height?
The maximum height for concreting walls with industrialized formwork depends on many factors:
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- Maximum design pressure: Each panel type has been designed for maximum resistance to pressure. Industrialized formwork is usually designed for maximum pressures between 40 and 80 kN/m².
- Fluidity of the concrete used: More liquid concretes generate higher pressures. Special attention must be paid when using self-compacting concrete &#;SCC&#;. (See question #7).
- Filling time: A faster concrete filling speed generates greater pressure on the formwork. When using more fluid concretes at significant heights, it is essential to maintain a low filling speed, which the formwork supplier must indicate in dedicated tables.
- External temperature: influences the curing of the concrete: the lower the temperature, the longer the setting time and the greater the formwork&#;s exposure to the load.
- Another factor to take into account is the concrete&#;s vibration, which makes the concrete fluid, maintaining pressures and delaying its setting. Deep vibrations can subject the formwork to very large loads. E.g. Above 6 m in height, it is more difficult to vibrate the concrete with a needle vibrator normally used on site. External wall-mounted vibrators are therefore used, whose positioning must be studied correctly. (See question #9).
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