NMDC D&M has adopted precast caissons as a practical and efficient solution for marine infrastructure projects. These gravity-based structures provide a combination of environmental, technical, and economic benefits, offering an effective alternative to traditional methods. By minimizing underwater operations, reducing material usage, and improving project efficiency, precast caissons address key challenges in marine engineering while enhancing sustainability
The caisson base slab and walls are constructed using a Gantry Hydraulic Slip-Form System on a floating dock or dry dock, ensuring consistent quality and precision. Reinforced concrete partitions form internal cells, providing stability and space for infill materials.
Once construction reaches the required height, the caisson is floated and towed to the project site using tugboats.
At the site, the caisson is ballasted with seawater until it settles on a prepared bedding layer. The internal cells are then filled with dredged sand for additional stability. This process minimizes underwater operations, ensures accurate placement, and improves overall project efficiency.
