The method of "belly attachment work" using underwater concrete, which incorporates precast residual formwork as part of the structure.

<Ensuring Safety and Planning> ■ The residual formwork method allows for construction in stages, eliminating enclosure and enabling quick evacuation in emergencies. ■ The residual formwork itself is self-supporting, allowing for safe operations underwater. ■ It is possible to ensure planning for offshore construction, which is easily affected by weather and sea conditions. <Economic Efficiency and Improved Workability> ■ The absence of enclosed spaces improves work efficiency, leading to shortened construction periods. ■ The lightweight of the products allows for construction using small machinery. ■ In conventional methods, a minimum width of 1.0 m was required for underwater work space for stability calculations, but with the residual formwork method that does not require enclosed spaces, designs can be made according to stability calculations, reducing the amount of concrete needed. <Simplification of Material Procurement> ■ Staged construction makes it easy to secure ready-mixed concrete and improves workability, enabling small-scale placements in fishing port construction. ■ Material delivery is limited to what is needed for staged construction, reducing yard area and simplifying yard planning.

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