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Such an agreement involves certain technical support activities to ensure the correct application of the protection system. After the patent has expired (like it is for the Accropode I) anyone can make a block with this shape, but one is not allowed to call it Accropode, because the name is still a protected trademark.
Tetrapods used to protect a seawall Large interlocked Xblocs (8.0 m 3 or 280 cu ft) in a trial placement. A wave-dissipating concrete block is a naturally or manually interlocking concrete structure designed and employed to minimize the effects of wave action upon shores and shoreline structures, such as quays and jetties.
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A wave-dissipating concrete block is a naturally or manually interlocking concrete structure designed and employed to minimize the effects of wave action upon shores and shoreline structures, such as quays and jetties. One of the earliest designs is the Tetrapod, invented in 1950.
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When solid blocks are used instead of diagonals it is called bridging, block bridging, solid bridging or solid strutting. The illustration, right, shows solid blocking. Note how they are displaced alternately to allow nailing through their ends. [1]
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Riprap causes morphological changes in the riverbeds they surround. One such change is the reduction of sediment settlement in the river channel, which can lead to scouring of the river bed as well as coarser sediment particles.