RAKUNA-IV is a radiation-type wave-dissipating block with 4 hollows on the surface. RAKUNA means "little hollow" in Latin. The hollows increase the surface roughness, which improves the wave-dissipating effect and also provides a habitat for marine organisms. The interlocking of the hollows and legs prevents the spread of damage and achieves high stability (Kd=10.8) against waves.
RAKUNA-IV features a higher porosity (56.5%) than conventional blocks so fewer blocks can be used.
Therefore, construction can be completed in a shorter period, and a smaller amount of concrete is required.
Through hydraulic model experiments with reliable research institutes in Japan, Vietnam, Indonesia, Korea, etc., we realize the optimal design to meet specific needs in localities. RAKUNA-IV has earned an excellent reputation for its outstanding features.
| Size | Weight(t) | Concrete Volume(m3) |
|---|---|---|
| 2t | 2.12 | 0.924 |
| 4t | 3.92 | 1.707 |
| 6t | 6.25 | 2.716 |
| 8t | 7.85 | 3.415 |
| 10t | 9.72 | 4.225 |
| 12t | 11.85 | 5.154 |
| 16t | 15.89 | 6.908 |
| 20t | 20.09 | 8.736 |
| 25t | 24.98 | 10.861 |
| 32t | 32.35 | 14.065 |
| 40t | 40.92 | 17.792 |
| 50t | 49.98 | 21.661 |
| 64t | 59.92 | 26.055 |
| 80t | 80.74 | 35.104 |
