Hydraulic and earth engineering – Bank – shore – or bed protection – Wave or flow dissipation
Patent
1981-12-23
1984-02-14
Taylor, Dennis L.
Hydraulic and earth engineering
Bank, shore, or bed protection
Wave or flow dissipation
405 21, 405 15, E02B 306
Patent
active
044313373
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
FIELD AND BACKGROUND OF THE INVENTION
This invention relates to a permeable wave dissipation caisson made mainly of concrete and placed on a seabed to dissipate the energy of waves passing therethrough.
Wave dissipation has been achieved thus far by using tetrapods or concrete blocks. This method has the disadvantage that the tetrapods or concrete blocks used are moved by the energy of the waves or that a multitude of such units are required for preventing such movement. This results in the increased cost therefor.
Moreover, obstruction of the movement of waves by the blocks prevents the alternating flow of seawater through the blocks, which causes corruption of the seawater.
It is true that there have been blocks having permeable structure, but they are built only of beams stretched in the shape of a box with walls inside and, therefore, there is the possibility that they may be turned round by the energy of the waves. Furthermore, the place wherein the blocks are set is dug deep by the waves, which makes a caisson unstable. The present invention is intended to provide a stable wave dissipation caisson which is not moved by the energy of the waves.
In addition, the present invention has the purpose of providing a caisson which not only improves the alternating flow of seawater therethrough but also can be utilized as a fishing rock owing to its permeable structure.
Furthermore, the present invention is intended to provide a caisson which can be piled one atop the other due to its box-shaped structure.
SUMMARY OF THE INVENTION
According to the present invention, two trapezoidal or triangular wing pieces having an appropriate number of holes are arranged with each bottom side thereof diverging, the top sides thereof are opposed and joined to each other to form a wing body, two sets of wing bodies thus formed are further joined to each other with opposed top parts thereof being made to face each other and turned round at an angle of 90 degrees to each other, and a structure thus constituted is housed in a bookcase-shaped frame whose bottom surface wall has an appropriate number of holes and whose upper part is formed only by angled sections of a framework, and afterwards the diverging bottom side of each wing piece is fixed to each angled section of the framework of the frame.
By this constitution, the waves advancing in between the diverging bottom sides of the wing body housed in the frame (as shown by an arrow in FIG. 1) are shifted and divided in the vertical direction A by a vertical space and in the horizontal direction B by openings provided in the wing body and are further broken up vertically and horizontally by the rear wing body joined to the front wing body with a turn at an angle of 90 degrees. Thus, the waves are broken up and made turbulent in the caisson and thereby the energy of the waves is scattered and dissipated completely.
Moreover, the holes made in the bottom absorb the energy of the waves, whereby the possibility of the caisson being upset by the waves is eliminated. In addition, the existence of the bottom in addition to the holes prevents the waves from penetrating into the place wherein the caisson is installed and from digging up the seabed at this place, whereby the stability of the installed caisson can be maintained. Furthermore, since the caisson has a permeable structure and, in addition, each wing piece is provided with holes, the ratio of a space inside the caisson is high and this makes the caisson inhabitable for fish and shellfish. Therefore, the caisson may also be utilized as a fishing rock.
In addition to the aforesaid effects, the permeable structure and the existence of holes in each wing piece in the caisson which has a volume of 4-500 m.sup.3 usually make it possible to reduce the quantity of concrete to be employed and thus the cost therefor.
Further, the caisson in the present invention does not obstruct the alternating flow of seawater through the caisson, whereby the corruption of the seawater at the back of the caisson is prevented. Moreov
REFERENCES:
patent: 627849 (1899-06-01), Hackett
patent: 3417533 (1968-12-01), Sparling
patent: 3645059 (1972-02-01), Grimm
Gungor John A.
Taylor Dennis L.
LandOfFree
Wave dissipation caisson does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wave dissipation caisson, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wave dissipation caisson will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2372562