Many cities in Japan are located on alluvial plains facing the coast and river basin areas, so it is not an exaggeration to say that levee and dikes are protecting the lives of people. There is an urgent need for regenerating and strengthening coastal and river levee to protect lives and assets from numerous natural disasters such as tidal surges and high waves from Typhoons, and tsunami from earthquakes.
For the reinforcement and repair of levee, there are quite a lot of cases where the existing foundations and wave-dissipating blocks are obstacles that hinder construction. Using the Gyropress Method with rotary cutting press-in of tubular piles with a bit attached to the tip, allows the building of a continuous wall of an implant structure while leaving the structure and underground obstacles as is, for the rapid regeneration and reinforcing of functions.
By installing a continuous wall of high-rigidity tubular piles inside the levee, this prevents collapse of the levee due to liquefaction or ground subsidence caused by an earthquake. Raising the height of the levee is also possible at the same time, enabling the reinforcing of countermeasures for tidal surges and flooding. Even if the levee were to be damaged by flooding or tidal surge, the continuous wall of tubular piles of Implant Structure will continue to maintain the disaster prevention function of providing resistance.
Steel sheet piles are installed into the embankment to a depth determined for proper stability and/or cut-off of flow. Also, liquefaction of the levee can be prevented by enclosing it with twin sheet pile walls. Thus, the levee can withstand large external loading and the levee crest can remain in place, even in catastrophic events.
In order to protect large-scale, critical production facilities, such as power plants that support our lives in modern society and chemical plants that handle large volumes of hazardous materials, from being damaged by tsunami or tidal surge, large diameter tubular piles are pressed into the bedrock using rotary cutting press-in, and a seawall reinforced with raking piles is built. The strong Implant Watertight Levee does not collapse even if it is breached, containing harmful substances such as contaminated water on the inside of the wall, and preventing flow outside the wall.
When strengthening the protective function of the dike, such as scouring prevention, even if there are ripraps or wave-dissipating blocks that have sunk deep underground, they cannot be removed in some cases, for the safety of the structure. Even in such cases, if using the Implant Method, you can build with certainty by using rotary cutting press-in to remove only obstacles that would be an impediment to the new structure. Steel is used as the main material for structural members that are used for the wall, and functions are added according to the purpose. For example, in the case of a coastal dike, we have developed a structure prepared with a crushing blade to withstand sand grit that is washed up against the structure in the waves, and is of highly wear-resistant material.
The floating city of Venice, Italy has also been registered as a world heritage site. This beautiful floating island was made using an endless number of larch piles in the wetlands of the Adriatic Sea, and is now on the verge of being submerged due to rising sea levels brought about by changes in atmospheric pressure and global warming. Therefore, multiple units of GRB System have been placed to build an implant seawall in a short period of time. It protects the heritage from submersion, without adversely impacting on the historic buildings and the daily lives of the citizens.