Question

Most common method of prestressing used for factory production is ........

• A. Long line method
• B. Freyssinet system
• C. Magnel - Blaton system
• D. Lee - McCall system

Hint:

The Long line method is particularly useful in factories producing a large number of prestressed concrete elements because it offers high efficiency and minimizes the labor and material costs associated with individual formwork. It is considered the standard method in the precast concrete industry.

Answer 1

The Correct Option is A

The Long line method is the most widely used prestressing method for factory production, especially for producing large numbers of prestressed concrete elements like beams and slabs. In this method, the prestressing tendons are laid out along a long line, and the concrete elements are cast in place around these tendons. The tendons are then tensioned before the concrete hardens, which results in prestressed concrete.
The advantages of the Long line method include its ability to produce multiple units continuously, providing higher efficiency and faster production times. It also minimizes the need for individual formwork for each unit, reducing costs and labor.
On the other hand, methods like the Freyssinet system, Magnel-Blaton system, and Lee-McCall system are primarily used for specialized applications and may not offer the same level of factory production efficiency as the Long line method. These methods are often used for individual, more complex projects requiring specific prestressing configurations, but they are not as commonly used in factory settings where high volumes of standard prestressed concrete units are produced.
Therefore, the most common method of prestressing used in factory production is the Long line method.