Form traveller

A cantilever form traveller is an advanced and specialized piece of equipment used in the construction of bridges and other concrete structures. Here is an introduction to it:

Definition and Basic Structure

A cantilever form traveller is a self-propelled, movable formwork system that is designed to support and shape concrete during the construction process. It typically consists of a main steel frame which provides the structural support, a working platform where construction workers can carry out their tasks, and formwork panels that come into contact with the concrete to give it the desired shape. The form traveller is called "cantilever" because it often extends out from the previously constructed part of the structure in a cantilever manner, allowing for the construction of the next section without the need for additional ground support.

Working Principle

The cantilever form traveller operates based on the principle of using the completed part of the structure as a support point. It is anchored to the existing concrete section and then uses hydraulic or mechanical systems to move forward and position itself for the next pour of concrete. Once in position, the formwork panels are adjusted and secured to the correct dimensions and alignment. Reinforcement bars are placed inside the formwork, and then concrete is poured. After the concrete has cured and reached the required strength, the formwork is released and the form traveller moves forward to the next location to repeat the process.

Advantages

High Efficiency: It significantly speeds up the construction process as it can be quickly moved and repositioned, reducing the time required for setting up and dismantling traditional formwork.

Quality Assurance: The use of a cantilever form traveller ensures a high degree of accuracy and consistency in the shape and dimensions of the concrete elements, leading to better quality structures.

Safety: It provides a relatively safe working environment for construction workers as they have a stable and dedicated working platform. Workers can carry out their tasks without the risk of working at great heights without proper protection.

Cost-Effectiveness: Although the initial investment in a cantilever form traveller is relatively high, in the long run, it can save costs by reducing labor requirements and construction time.

Applications

Bridge Construction: It is widely used in the construction of various types of bridges, especially long-span bridges and viaducts. For example, in the construction of cable-stayed bridges or continuous beam bridges, the cantilever form traveller is used to construct the bridge decks and piers section by section.

High-Rise Buildings: In some high-rise building projects, cantilever form travellers may be used for the construction of exterior walls or other vertical structures. They can be used to form the concrete walls in a progressive manner as the building rises.

Tunnel Linings: In tunnel construction, cantilever form travellers can be used to create the concrete linings. They can be adjusted to fit the curved shape of the tunnel and move forward as the tunnel excavation progresses.

In summary, the cantilever form traveller is an important innovation in the field of construction, offering a combination of efficiency, quality, and safety that makes it an indispensable tool in modern infrastructure projects.