US1844484A - Jetty - Google Patents

Description

Feb. 9, 1932. L, B SMITH 1,844,484

JETTY Filed May E51, 1928 @ttor www Patented Feb. 9, 1932 UNITED STATES LLOYD B. SMITH, F TOPEKA, KANSAS JETT'Y Application filed May 31,

My invention is concerned with jetties, and particularly with jetties oi' the type in which the jetty is formed of a plurality of spaced jetty-units which are interconnected by i cables to torni the complete jetty. My inveution, however, is not limited, in its broader aspects, to this particular torni ot jetty.

Then jetties are positioned `to extend transversely ot stream flow, and atter a bar l0 has been built up on the downstream side oi' the jetty, there develops an appreciable llow of water along the rip-stream tace of the jetty and generally parallel thereto. The current thus produced has a tendency to scour the stream bed at th0 rip-stream face oi the j etty; and in many instances the effect ot this scouring is so great that the bed oi. the stream becomes washed away to such an extent that the jetty, or the individual units thereof, will tip in an rip-stream direction. lu some instances, this scouring action may proceed to such an extent that the entire jetty, as well as its rip-stream face, is undermined; and the whole j ctty settles downwardly. thus greatly decreasing its eilectiveness.

'llt is the object of my invention to prevent this scouringl action at the upstream edge of the jetty base, and thus to prevent tipping el the jetty or its individual units.

1 accomplish the above objects by providlngr on the up-stream face of the jetty smaller auxiliary jetties extending generally transversely oit the flow which develops parallel to the main jetty. These auxiliary jetties form small sand bars on the rip-stream tace of the main etty and prevent any scouringr action at the upstream tace of the main jetty.

The accompanying drawings illustrate my invention: Fig. 1 is a plan view of my improved jetty; and Figs. 2, 3, and 4 are seotions through the stream and transversely ol the jetty illiistrating,r various modifica-- tions or arrangements capable of accomplish inomy objects.

The jetty illustrated in the drawings is built up of individual units which are desirably though not necessarily constructed in accordance with my prior United States Let ters Patent No. 1,554,605, issued September iQ A 192s. seal No. 281,642.

22, 1925. The various jetty units 10 have obliquely extending arms 11 some o1 which extend downward and rest on the bed 12 of the stream to form a support for the jetty units. The individual jetty units are interconnected to form a complete jetty, one such method of connection being illustrated in my copcnding application Serial No. 51,956, filed August 24, .1925, which co-pending application has since resulted in Patent No. 1,716,509.

A jetty so constructed and placed to extend transversely of the stream as indicated in Fig. 1 will result in the formation of a bar 13 on the down-stream side ofthe jetty; and after such baris formed there Will develop immediately upstream from the jetty a flow of water transverse to the normalrdirection of stream flowand approximately paralel to the jetty. The current thus produced on the upestream side of the jetty results in a scouring of the stream bed along the upstream of the jetty-base; and this scouring may become great enough tocause settling of the rip-stream arms 11 where they rest on the bed 12, thus causing the jetty or its individual units to tip inr an up-stream direction.

When the jetty units are originally put in place, they are usually anchored to prevent any down-stream movement. To this end, it is customary to bury in the bed of the stream at a distance up-stream from the jetty one or more anchors 15 to which are attached cables 16, the down-stream ends of which are secured to the jetty units 10. Instead of usingl buried anchors 15 to which the cables 16 85 are attached, I may employ jettyunits as illustrated in Fig. 3. Each of the cables 16 is usually secured to a jetty unit of the main jetty at a point above the bottom thereof, usually about the middle, in order to prevent 9c the jetty from tipping as a result of the pressure on its up-stream face. This arrangement of cables is illustrated in Figs. 2 to 4 inelusive.

To prevent the scouring which occurs at the rip-stream edge of the jetty, I form bars which extend 11p-stream from the main jetty and which serve to prevent or reduce thevelocity of any flow of water immediately adjacent the up-stream face of the main jetty. icc

These bars 18 are conveniently formed by means of auxiliary jetties, in the construction of which the cables 16 may be used. To this end, I may supplement the cables 16 With cables 17 which extend from the anchors 15 or upper jetty units to the jetty units 10 of the mainjetty, and between the cables 16 and 17 attached to eachV jetty unitlO I may provide a screen 20 Which extends a short dis.- tance up-stream from each jetty unit. rIhese screens 2O reduce the speed" ofthe-'currentv parallel to the face of the main jetty, create'y eddies, and result in the disposition of sediment which eventuallyn formsthe auxiliary barslS. Y

In certainE cases, particularly 'Where the yWater is deep, I may stack against the upstream face of the main jetty suitableV brush Wood 21 as illust-rated in Fig. 4. This brush- Wood, which may or may not be used in conjunction With the screens 20, aids; in the Y formation of the small bars-18.

After the bars. 18 are Jormed, any lcurrent flowing transversely through it to cause a deposit of silt on the down-stream side of the jetty, said diversion jettyincluding a plurality of jetty units resting on the stream-bed, anchoring means located up-stream from said jetty, a pair'of cables extending in vertically spacedrelation from said anchoring means to each ofsa'id jetty-units to prevent displacement thereof, and current-retarding means supported upon the two cables of each Qair ofcables'adj'acent the up-stream face of the jetty to form one or more auxiliary jetties disposed at an angle tothe diversion jetty to retard stream-,currents parallel tothe diver- Vsion jetty and to'cause a deposit of silt on the rip-stream side thereof.

In Witness whereof,.I have hereuntosetmy hand Topeka, fKansas, this 25th day 0I" May, A, D. one thousand nine hundred and twenty-eight. Y Y

transverse to the normal direction of stream Y flovv'and generallyparallel to the mainjetty v is greatly reduced in velocity atl the face of Athejetty; and as aresult any scouring action,

ifl` there is any, occurs at a considerable dis- I tance 11p-stream from the; main jetty and at a Y point Whereit will not result in the settling Vor tipping of the `jetty units. v Y

I claim as my invention 1.# In combinationfa` diversion jetty extending generally transversely of a stream Y- and adapted to retard thejvelocityjof Water flowing transversely through it is-cause va deposit of silt on the down-stream side of. the

jetty, and one or more auxiliary jetties disposed on the rip-stream side of said diversion jetty and extending at an angle thereto Y to retard stream-currents parallel to the diversion jetty and to cause a deposit of site on the lip-stream side thereof. Y.;

2. Incombination, a diversion jetty extend- .ing generally transversely rota stream and adapted to retard'the' velocity of Water tlowingntransversely through itv to cause-a deposit Vor. silt on the down-stream side of the jetty, said diversion jetty including a plurality of jetty units resting `on the stream-bed, anchoring means located up-stream from said jetty, a pair of cables` extending in vertically spaced relation from said anchoring Vmeans to each of 4said jetty-units to prevent displacement thereof, anda screen extending between the Vtwo-cables of each pair of cables adjacent the Lip-stream face of the jetty to form one or'more auxiliary jetties vdisposed at an angle to the diversion jetty to retard stream-currents parallel to the diversion jetty and to cause a deposit of silt on the 11p-stream side thereof. i

'3. YIn combination, a diversion jetty extending generally transversely of a stream,

v'and adapted to retard the velocity of Water ,mmmmwnmwwww .mmmk CERTIFICATE OF CORRECTION.

Pei-ene No. 3,844,484. Granted February 9, 1932, to

LLOYD B. SMITH.

ii ie hereby certified imt error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, lille 72, after he word "stream" insert ihe word edge; page 2, line 36, claim 1, for "is" read io, and line 42, same claim, for "site" read silt; and ihat the said Letters Patein, shouid be read with these corrections therein that the same may conform to ehe reeomi of the case in the Pa'ient Office.

Signed and sealed this 22nd day of March, A. D. i932.

M. J. Moore,

{Semi} Acting Commissioner of Patente.

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