Solution | Balanced Cantilever Bridges

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Here are some important points to consider when designing a balanced cantilever bridge. Tendon LossPost-tensioning is used for balanced cantilever bridges. Prestressing force is applied at each stage of construction. Therefore, calculations are needed to compensate for the loss in the prestressing force that may occur depending on the construction stage. There are two main factors that cause loss in the prestressing force. One is instantaneous loss/Immediate loss, and the other is time dependent loss/long-term prestress loss.

The causes of instantaneous loss/immediate loss include elastic shortening of concrete, slip of anchorage, and friction between tendons and sheaths. All three occur immediately when tension is introduced into the structure. In balanced cantilever bridges, a number of joints occur due to the characteristics of girder segments being constructed in stages. At each joint, unpredictable inclination and curvature of the sheath occurs, so it is important to take care of additional losses due to friction.

The causes of time dependent/long-term loss include creep and shrinkage in concrete, and tendon relaxation. Shrinkage of concrete is a phenomenon in which concrete contracts as it hardens. If the in-situ concrete method is considered, concrete shrinkage should be considered in the calculation of the loss of prestressing force. If precast concrete method is used, it is relatively less affected by shrinkage. Creep refers to a phenomenon in which the internal strain increases when a constant load is applied to the structure for a long period of time. This phenomenon occurs in both concrete and steel structures, and when it occurs in steel structures, it is called relaxation. This also causes loss of prestressing force because additional strain occurs after the structure is completed.

Overview

The overhead form traveler offers several advantages, including a simple structure, well-defined load distribution, spacious operational area beneath the main frame, and ease of installation and removal. 

To facilitate forward movement, the form traveler is equipped with wheels mounted on bearings, significantly reducing frictional resistance. Additionally, stainless steel plates are welded to the rails, minimizing friction between the sliding bearings and rails during movement. These features simplify and expedite the movement cycle of the form traveler, making it easy and efficient to operate.

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In terms of safety, the Zolo form traveler is equipped with a walking protection system, ensuring complete safety during operation. It's designed to be safe, user-friendly, and practical.

The Zolo stayed-cable cantilever traveler is specifically designed for large-scale stayed-cable cantilever bridges with wide bridge decks and heavy, long segments. The majority of the components are concentrated on the bottom frame and walking system, eliminating the need for a mainframe. The lifting process is carried out by the bridge&#;s stay cables. Compared to other types, the stayed-cable cantilever traveler is heavier in individual weight.

Zolo services include installation on site, dismantling at the end of the project and supervision of launching. Furthermore, a long-term site assistance is granted

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