Hydraulic and earth engineering – Bank – shore – or bed protection – Revetment
Patent
1982-01-18
1984-08-14
Taylor, Dennis L.
Hydraulic and earth engineering
Bank, shore, or bed protection
Revetment
404 41, 405 15, 405 20, E02B 312
Patent
active
044653980
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a revetment for protecting the inclined surfaces of beaches, shores, rivers or channels, and of structures such as moles, dikes or channel walls, located in these places against erosion by waves and flowing water, the revetment being formed by a plurality of heavy, relatively thick plate bodies located side by side and preferably directly on the inclined surface.
BACKGROUND ART
DK-AS No. 112,649 discloses a revetment to be located on the inclined surfaces of moles and breakwaters. This revetment is formed by a plurality of loose blocks loosely leaning against each other and provided with water penetration holes. A revetment formed by these blocks is indeed water-permeable, but not coherent and flexible. The flexibility is a desired feature because it is necessary that the revetment may be quickly adjusted to the base on which it rests. When the coating cannot keep up quickly enough with the base where said base is washed away, it breaks up rather quickly on account of the waves. It is not sufficient to locate the blocks of the revetment relatively loosely relative to each other, since the block, the base of which is washed off, leaves an opening in the revetment. From this opening, the wash of the waves may easily break up said revetment.
DE-OS No. 26 34 586 discloses a revetment formed by a plurality of plate bodies located side by side, and which may be placed directly on the ground. However, this revetment is not suited for coast protection, firstly because the plate bodies comprise no water penetration holes and secondly because it is not flexible. The projections located on the plate bodies are intended for a rigid locking together of two bodies, thus providing a coherent revetment, but the latter is not flexible.
DISCLOSURE OF INVENTION
The object of the invention is to provide a revetment of the above type, which is water-permeable, coherent, appropriately heavy, and flexible, and which furthermore is so easy to mount that the mounting procedure may be performed by unskilled persons.
The revetment according to the invention is characterized in that each plate body at a first pair of opposite ends comprises hinge members such as hinge pins for a flexible securing of said plate body to the adjacent plate bodies, and that each plate body furthermore comprises a plurality of substantially vertical water penetration holes as well as two hinge openings located at a second pair of opposite ends of said body, said hinge openings being shaped in such a manner that they beyond allowing water penetration may receive hinge members such as hinge pins on the adjacent plate bodies. As a result, the revetment constitutes a coherent, heavy structure possessing an appropriate flexibility. Furthermore, this revetment is appropriately water-permeable, whereby the waves washing up on its top side may be disintegrated and removed relatively easy and quickly. The fine water-permeability is particularly due to said hinge openings being considerably water-permeable. By "pins" is meant not only pins of a small cross section, but also pins of a large cross section.
According to the invention the hole area of each plate body may cover about 15-30%, preferably 20-25% of the total planar area of said plate body, whereby a particularly good water-permeability is obtained.
Furthermore according to the invention, each plate body may be reinforced, whereby said plate body is more resistant to the wash of the wave than previously.
Moreover according to the invention, recesses may be provided at the underside of each plate body, said recesses together with corresponding recesses in the adjacent plate bodies forming a channel system for draining off the water penetrating the revetment. The water flowing through the water penetration holes may thus be quickly returned to the waterline.
According to the invention, one or more of the water penetration holes may be relatively small and located in a predetermined pattern, e.g. in such a manner that a grating is formed, whereas the hinge openin
REFERENCES:
patent: 881700 (1908-03-01), Miller
patent: 929728 (1909-08-01), Taylor
patent: 3096621 (1963-07-01), Danel
patent: 3385183 (1968-05-01), Kortz
patent: 4167599 (1979-09-01), Nissinen
patent: 4195809 (1980-04-01), Morrison
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