Launching Girders

TWD has a proven track record in designing launching girders, commonly called cantilever bridges, for various near-shore marine infrastructures including jetties and bridges. Our designs range from simple skidding piling gates to advanced mobile fabrication sites.

Our designs are always tailored to the specific needs of our client’s project. Typically, they incorporate workstations for piling, concrete casting, welding, and lifting. By ensuring construction is independent of waves and tides, our solutions optimize construction rates, reduce expenses, and ensure safety. We offer our expertise in geotechnical, marine, civil, and mechanical engineering to provide custom-made and efficient solutions and to increase the success of complex marine projects.

Method Engineering

The launching girder, equipped with various integrated workstations, functions as a mobile fabrication site. Each workstation requires the supply of components such as concrete, steel, or pre-cast elements. During construction, the width between the main girders of the machine presents a limitation for the logistical operation. TWD’s multi-disciplinary engineering team can assist you in designing an efficient operational sequence, addressing logistics concerns, and eliminating potential bottlenecks.

Moving Forward

The substantial launching girder, with its several-thousand-ton weight and accompanying workstations, may require relocation over distances exceeding 40m between the headstocks. This can be achieved effectively and safely using methods such as winches, a skidding system, or a crane. This decision involves finding a balance between speed and the loads exerted on the permanent structure. At TWD, we work closely with our clients and the permanent works designer to determine the optimal solution.

Piling

The bents of the jetty infrastructure comprise several tubular piles upon which the headstock is installed. Within the same project, the number, diameters, positions, and inclinations of these piles can vary. To move to the next position, the piling gate on the launching girder must accommodate various bent designs. Once the piles are driven to depth, the headstock is positioned and secured onto the piles. The piling gate must then be capable of moving aside to allow sufficient space for both the piles and headstock, considering the installed position and the forward movement of the launching girder. To address these challenges, the TWD engineering team has designed a range of nimble piling gates. Our dedicated team is prepared to tailor the optimal solution for your project needs, enhancing both safety and efficiency.

Constructing something in the marine civil environment? Our custom-made temporary works help you overcome complex challenges. If you want to better understand the extent of TWD’s expertise, please read our Marine Civil Solutions Overview. In order to explore how we’ve contributed to industry-leading success in projects, featuring clients like VolkerStevin UK, BAM, SRGB, and more, you can download our Track Record.