A form traveller is a type of travelling formwork system, which is ususally used in bridge construction, and it plays an indispensable role in bridge construction.It enables repeated construction of structural elements and is commonly used in the free-cantilever construction of post-tensioned box girders and cable-stayed concrete bridges.
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Bridge form traveller, also known as a launching gantry, it is a temporary structure used in bridge construction to support the construction of the bridge deck. It is typically a large steel or concrete frame that spans the gap between two piers or abutments and is used to lift and place precast concrete segments or steel girders into position.
The bridge traveller is designed to move along the length of the bridge as bridge construction procedure, allowing workers to build the bridge deck from one end to the other. As each section of the bridge deck is completed, the traveller bridge is moved forward to support the next section.
The advantage of using a traveller formwork is that it allows for faster construction times and reduces the need for temporary supports or scaffolding. It also provides a safer working environment for construction workers, as they can work from a stable platform rather than having to work from heights.
However, the design and construction of form traveller bridge can be complex and require significant planning and engineering expertise. The structure must be able to support the weight of the precast segments or steel girders, as well as the weight of workers and equipment. It must also be able to withstand wind and weather conditions during construction.
What are the Parts of A Form Traveller?
HY Bridge Formwork main components mainly consist of bearing bottom supporting sysytem, formworl and support syste,. walling and anchor system, suspension lifting system.
How does a Cantilever Form Traveller Work?
A Cantilever Form Traveller is a specialized construction equipment used in the construction of bridges and viaducts. It is designed to support the construction of bridge segments or deck sections in a balanced and incremental manner.
The Cantilever Form Traveller consists of a large steel framework that is supported by a set of temporary supports or towers. It is typically positioned at one end of the bridge or viaduct and gradually extends outwards as the construction progresses.
Here's How it Works:
1. Initial Positioning: The Cantilever Form Traveller is initially positioned at the starting point of the bridge or viaduct, often on one of the piers or abutments.
2. Segment Placement: The first segment of the bridge or deck section is placed on the Cantilever Form Traveller. This segment is typically precast or cast in situ.
3. Balanced Construction: The Cantilever Form Traveller uses its temporary supports or towers to balance the weight of the segment being placed. This ensures that the structure remains stable during construction.
4. Incremental Extension: Once the first segment is in place, the Cantilever Form Traveller gradually extends outward by pushing or pulling itself along the completed segments. This allows for the placement of subsequent segments.
5. Repetition: The process of segment placement, balanced construction, and incremental extension is repeated until the entire bridge or viaduct is constructed.
The Cantilever Form Traveller offers several advantages in bridge construction, such as increased efficiency, reduced labor requirements, and improved safety. It allows for the construction of long-span bridges and viaducts without the need for temporary supports in the water or deep foundations.
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It's important to note that different variations of Cantilever Form Traveller exist, and their specific mechanisms may vary. However, the general principle remains the same &#; supporting balanced construction and incremental extension during bridge or viaduct construction.
What are the Advantages of Using a Cantilever Form Traveller?
A cantilever form traveller is a type of constructed travel form equipment used in the construction of bridge decks and other large concrete structures. It is a self-contained system that can be used to construct large sections of concrete in a controlled and efficient manner. There are several advantages to using a cantilever form traveller.
First, bridge traveller allows for the construction of large sections of concrete in a single pour. This means that there are fewer joints in the finished structure, which can improve its overall strength and durability.
Second, a cantilever form traveller is a highly efficient construction method. It allows for the rapid construction of large sections of concrete, which can save time and money compared to traditional construction methods.
Third, form traveller system bridge construction is a safe construction method. The equipment is designed to be self-supporting, which means that workers do not need to be exposed to the hazards of working at heights or on unstable scaffolding.
Overall, a cantilever form traveller is a highly effective construction method that can be used to build large form traveller bridge construction quickly, safely, and efficiently.
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The ability of the formwork products to integrate with each other, simplified the process when more than one product was needed.
The Challenge:
Remove and replace approximately 12,000 square feet of highway US-281 in Burnet County, Texas, including the steel-deck truss bridge that crosses the Colorado River.
The Players:
Doka
Archer Western Contractors
The Process:
Built in and rehabilitated in , the steel-deck truss bridge of highway US-281 that travels over the Colorado River in Marble Falls, Texas, is inefficient and will soon be replaced.
The bridge replacement project consists of the demolition of a steel truss bridge that will be replaced with twin cast-in-place segmental bridges. The bridges will each be three-span variable depth cast-in-place segmental structures. The spans of the bridge will be 274, 410 and 274 feet, with a bridge deck width of 47 feet. The structure will be built using the balanced cantilever construction method with end spans constructed on falsework. The box depth will vary from 23 feet at the interior piers, to 9 feet, 6 inches at the end spans, and have a variable super elevation of up to 5.5 percent.
The distinctive feature on this project is the overall V shape of the bridge. The bottom of the bridge starts with a deep V shape that tapers to a very flat V shape at the apex or center span. This required a form that was flexible in all directions, as no two segments were the same.
The proposed bridge&#;s unique geometry required careful advance coordination between Doka and Archer Western Contractors. Doka had to create forms that were flexible from start to finish. The different span lengths at varied box depths required flexible formwork to accommodate the many wide-ranging needs.
Archer Western chose Top 50 formwork panels which were easily customizable to almost any configuration in the preassembly yard or on the jobsite. Top 50 allowed the contractor to use less labor, meet on-site requirements economically and improve safety with walkway brackets.
To meet the complicated geometry of this bridge in cost-efficient manner, Doka began by supporting the pier table with the Staxo high performance shoring system and using Top 50 formwork panels for the lower soffit, walls and upper soffit (or road deck). Staxo provided Archer Western with high shoring capacity, versatility, and quick and easy assembly using integrated couplers.
The pier table was poured in three separate steps. The formwork mostly stacked on itself so that shoring and form removal was kept to a minimum. When the pier table was complete, the traveler was set and the segment formwork was put in place.
Like the pier table, the backspan will be a three-step process in which Doka will supply the formwork and shoring. The backspan will use Staxo shoring and Top 50 formwork as well.
The ability of the formwork products to integrate with each other simplified the process when more than one product was needed. Additionally, since this project had innovative elements to the design, ingenuity and inventive thinking were required of the form supplier. For example, all of the forms from the pier table to the traveler had to allow for not only geometry changes but also field changes. This required flexibility that could not have been accomplished with the use of the traditional steel forms.
&#;The thing that I liked most about the Doka forms on this project is that the formwork hinges when stripped,&#; said Mike Wood, Archer Western Project superintendent. &#;With a steel form, we would have had to take it apart each time, but with the Doka forms they always stay together. This makes it fast and easy to strip and reset.&#;
The outcome will be a beautiful, well-constructed bridge that will serve the community for years to come without the constant maintenance required by the current steel bridge.
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