Title of Invention

A BREAKWATER FOR SEAWAVES

Abstract A break water for sea waves comprising a plurality of piles for being driven in the sea bed spaced relationship; a porous screen suspensible between each pair of adjacent piles, said screen consisting of cages enclosing porous material which enables sea waves to lose energy while passing through the cages and the porous material resulting in wave attenuation during such passage.
Full Text

This invention relates to a breakwater for use against sea waves.
Numerous facilities along the coast, worldwide, such as recreational harbors, marinas, bays and fishing harbors are affected by massive waves, resulting in the loss of human lives and damage to structures- Swimmers and surfers in holiday resorts prefer to have acceptable wave conditions for sporting activities. On the other hand, still water conditions are not necessary for fishing/recreational harbors. Under the given circumstances, the known breakwaters, like the floating breakwater, the submerged rubble mound breakwater and the pile breakwater are considered as an alternative to the conventional rubble structures, which are usually adopted for large-scale harbors.
The floating type and the submerged rubble mound type are useful when the water depths are

relatively shallow. For large water depths, the pile breakwaters are suitable. In the recent past, closely spaced steel pile breakwaters are recommended especially for fishing and recreational harbors, wherein moderate wave disturbances are permissible in harbor basins.
The cost of a closely spaced pile breakwater is directly related to the number of piles needed for its construction.
The object of this invention is to propose a breakwater employing piles, but eliminating the need to have them closely spaced. The closer the spacing of the piles, the greater the cost. On the other hand, the spacing between the piles, in the breakwater proposed herein, is indeed larger than the known pile breakwater, and is therefore cost-effective.
By reason of the foregoing facts, the installation of the breakwater proposed herein is easier.
The breakwater proposed herein is intended particularly, though not exclusively, for fishery and pleasure-craft harbors.

Various other features and advantages of this invention will be apparent from the following further description thereof.
The breakwater for use against sea waves, according to this invention, comprises a plurality of piles for being driven in the sea bed in spaced relationship; a porous screen suspensible between each pair of adjacent piles, said screen consisting of cages enclosing porous material which enables sea waves to lose energy while passing through the cages and the porous material resulting in wave attenuation during such passage.
This invention will now be described with reference to the accompanying drawings which illustrate,
in Figs. 1(a) to 1(c) the known floating breakwater, the known submerged rubble mound break water and the known pile breakwater, already discussed herein above
in Fig. 2, by way of example, the general arrangement of an embodiment of the breakwater

proposed herein
in Fig. 3, a perspective view, by way of example of the general arrangement of the said embodiment
in Fig- 4 details of the objects in the cage, exemplified by pvc tubes
in Fig. 5 a stack of the pvc tubes referred to above.
and
in Fig. 6 a separate view of a cage.
The embodiment i1lustrated wi11 be seen to comprise a plurality of piles P for being driven in the sea bed B in spaced relationship. The term "sea" and its grammatical connotations, in this specification, mean and include bays, marinas, harbors and other waters to which this invention is applicable.
A porous screen S is suspensible between each pair of adjacent piles P, said screen consisting of cages C enclosing corrosion resistant porous

material M which enables sea waves to lose energy while passing through the cages and the porous material, resulting in attenuation of waves during such passage.
One of various forms the porous material may take consists of closely spaced objects made of a corrosion resistant material, such as, the pvc tubes C.
In the breakwater proposed herein:
♦The number of piles to be driven in the sea bed is reduced, by reason of the intermediate screens; consequently, the invention is cost-effective.
♦Performance wise the breakwater proposed herein is more efficient in attenuating the waves when compared to an arrangement of closely spaced piles
*In the breakwater proposed herein, since the piles are spaced far apart and the screen is immersed partially in water, the area of obstruction to the flow is less and therefore the sea bed is also less disturbed.
♦The suspended screen is readily and easily

replaceable, when required.
The terms and expressions in this specification are of description and not of limitation, there being no intention in the use of such terms and expressions of excluding any equivalents of the features i1lustrated and described, but it is understood that various other embodiments of the breakwater proposed herein are possible without departing from the scope and ambit of this invention.





We Claim:
l.A breakwater for use against sea waves comprising a plurality of piles for being driven in the sea bed in spaced relationship; a porous screen suspensible between each pair of adjacent piles, said screen consisting of cages enclosing porous material which enables sea waves to lose energy while passing through the cages and the porous material resulting in wave attenuation during such passage.
2.A breakwater as claimed in Claim 1 wherein the porous material consists of closely packed objects made of a corrosion resistant material.
3.A breakwater for use against sea waves substantially as herein described with reference to, and as illustrated in, the accompanying drawings.


Documents:

mas-1998-463-abstract.pdf

mas-1998-463-claims duplicate.pdf

mas-1998-463-claims original.pdf

mas-1998-463-correspondance others.pdf

mas-1998-463-correspondance po.pdf

mas-1998-463-description complete duplicate.pdf

mas-1998-463-description complete original.pdf

mas-1998-463-drawings.pdf

mas-1998-463-form 1.pdf

mas-1998-463-form 19.pdf

mas-1998-463-form 26.pdf


Patent Number 204480
Indian Patent Application Number 463/MAS/1998
PG Journal Number 40/2007
Publication Date 05-Oct-2007
Grant Date 22-Feb-2007
Date of Filing 06-Mar-1998
Name of Patentee INDIAN INSTITUTE OF TECHNOLOGY
Applicant Address OCEAN ENGINEERING CENTRE,IIT P.O, CHENNAI,600036
Inventors:
# Inventor's Name Inventor's Address
1 DR.JAMBUNATHAN SUBRA MANI OCEAN ENGINEERING CENTRE, INDIAN INSTITUTE OF TECHNOLOGY, IIT PO, CHENNAI 600 036.
PCT International Classification Number E02B3/06
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA