US2378865A - Jetty - Google Patents

Description

June 19, 1945 y G. w. REHFEL JETTYy Filed sept. 4, 1943 A TTORNE YS.

Vareaof the members. n

Patented June 19, 1945 UNITED STATES PATENT OFFICE TT 2,378,865 T g T j "JETTIj George wnehfela, Manhattan, Kaese* T ApplicatonlSeptember 4, 1943, Serial No.` 501,243 5 claims. TTTiCLol-sl This invention 'relates to .jetties particularly adapted for use along the banks yof streams and upon overflow lands to prevent erosion and effect deposit of silt. J etties are usually madeof "structural members arranged `to provide a plurality of outwardly extending arms or legs which areinterconnected `with a wire lacing, to 'provide the desired current retarding surfaces. The practice heretofore has been to construct thejarmfmembers ofthe fjetties of heavyrigidTmaterialfso that they are self-supporting independently of the lacing." This is for the reason 'that Ithe lacing 'ca`nnotbe-"depended upon to enhancethe strength-of the jettiesgsince the lacinglslips out of placejalong 'the length `of the members underthe severelouf-` fetingto which the jettiesare subjected: i T'I'hegextreme rigidity of suchV jetties` `pevents their use in navigable streams forA the-reason that fio `the rigid arm members are aptto puncture the i hulls of vessels that might float into contact with them. `TAlso such jetties mustjcontain afsubstanftiali amount 0f material; are heeVmjeXDehi/e and jdincult'toinstall.V l

of the members`"`by forming them offstructural` shapes; for example, angle iron's,` and to positively anchorjthe lacingby threadingTTthe lacing through bers, 'but this has not provedb satisfaetoryibecause `of addedTmanufacturing costand thestruc T`tural Tmembershave been weakened byjreductlon in cross sectional areaat the points' ofanchoring thelacing.

"Machining of" the` metal also exposes`n's'rfaces which aremore readily subject to rustandcor- Trosion and provide sharp edges that out through intended purpose;

It is the purpose ef thefpresehi invention -te,

'overcome these diiculties by providing relatively lightweight jetty arms having a substantial-Tnegree` `of Aflexibility sol that undefst'ress theyjare capable of bending uniformly throughout"'their length, and @by providing .laoing`4 anchorsalong the lengthof the jettyarms thatproject-from fthe" surfaces thereof"` for"'preventing shifting lof 'the lacing without reducing the cross sectional T :T'Tllexibility Tof the lttyarms also allows' for use `r-of" the `jetties'A inA navigable streams as they are readily deflected when struck bythe huujer' vessel and the force `of the Tblowi is absorbed in flexing of the arms `rather than Icausing them to piercefthe shell of the Vessel. T

Other objects of the invention are torpro'vide a jetty having metal arms inherently coveredfvvith A a rust resistant coating; `to provide for elimina# tion of "machiningfoperati'ons that ordinarilyl expose surfaces to corrosion; to provide for welding lthe members together in forming a unitary structurej to `prin/ide positive anchorage forl the?l lac`- ing so `that the lacing cooperates to support the arms of the jjett'y;` Tandto provide an anchorage forfth lacing"tl at*retain`s its positivelcon'ne'ctin under "i'lexure of the arms. t

In ccomplishing'these and other objectsofthe invention hereinafter pointed out, I have provided improved structure, the fpreferredform of which i's illustrated in" the 51' accompanying-drawing', wherein: -f T T j 1 1i"ig. A 1 is a perspective 'viewer a jetty c onstructed in accordanee 1with the present invention; "Fig.2tis a fragmentary perspective view illustrating anchorage ofthe lacing rods prior tobend# ingover the anchoring lingers. i

Fig. 3 is a similar vieWT after the fingers have beenbent te reteointhelacingred. Fig', `i isa fragmentary perspective View o'f the central portion of the jettyparticularlyillustrat ingf"connection' of the arm andfleg members f of the jetty. l? vf l Fig;` 5 is a fragmentary perspective view of the outerend ofoneofthe arms. Y I #Figl 6 isfa `fragmentary perspective view of'a portion offaljetty arm equippedwith a modied form of lacing anchor lug. X i

Referring more indetail to thedrawingzi` Y "'I 'designates' a jetty 'constructed in accordance with the present' invention and which includes a plurality of .elongated rod or bar-like members 2 arrangedin crossingrelation with theends thereof extending outwardly in opposite directions to` provideA the desired spread of lacingt,v later describedf l In carrying -outthe present invention, 'the menib'ersfZ` comprise metal bars or rods having substantially uniform Tcross sec'tion throughout vthe length thereof and 'capable of yielding uniformly When'subjected to buffeting action of heavy driftage. 4The surfaces Vofvthe members are also provided with a rust resistant coating Vso that :the `members'have a substantiallylong life when sub- :jected to saltwater, or waters TT'containing `cor.- rosiveunaterialsgcT f l T I have found that rods or'barssuch asvused in the reinforcement of concrete structures have all the above qualiiications and are readily obtainable for use in jetty construction. Reinforcing bars provide the desired flexibility, have the necessary toughness and strength, and flex uniformly throughout their length. Reinforcing bars also have a natural coating o1" scale covering the surfaces thereof so that they are protected from rust and corrosion. The metal of reinforcing bars also provide for ready welding of the bars at the site'of installation, preferably by electric arc welding, so that assembled they form a sturdy unit, free of rack, when the arms are under stress. Reinforcing bars also have rounded edges so that they do not cut the lacing members and, being of solid cross section, they provide maximum strength for a given amount of metal. Furthermore, reinforcing bars may be obtained which are provided with uniformly spaced deforations 4 projecting laterally from the surfaces thereof which provide positive stops to prevent shifting of the lacing on the bars. n

In cooperation with the deformations 4, I may provide the bars with lacing Aanchors 5 which are shown in Fig. 2 asV comprising substantially U- shaped clips having bar portions -B and Iprojecting fingers or lugs I vand 8 spaced apart to accommodate the lacing therebetween. The anchors 5 are formed of formable material and are attached to the bars at spaced intervals along the length thereof by weldingv the bar portions 6 to corners of the bars, as indicated at 9 so that the fingers 1 and 8 extend laterally lfrom the bars as shown in Fig. 2. The anchors may be Welded to the corner edges of they bars as illustrated in Fig. 2, or theymay .be Welded to the face sides that carry the deformations 4. I find that positions on or adjacent the corner edges of the bars are most convenient for welding and for ready application of the lacing 3. i

In Fig. 6 I have illustrated a modified form of lacing anchor which comprises a short length rod orwire I2 welded transversely of the jetty barsas indicated at I3 to provide laterally extending iingers about whichthe lacing may be wrapped.

The outer-most anchors arepreferably welded asat I6 to the end faces II of the bars so lthat the fingers thereof normally extend in the direction of the arms to permit ready seating of the outer-most lacing 3.

In assembling .they jetty, reinforcing vrods or bars having a dimension to provide the necessary strength are cut to the desired length and the anchors 5 are welded therealong for receiving the inner lacing of the jetty. Anchors 5 are also welded to the end faces I'I of the bars, after which, the bars are arranged in crossed relation.

The jetty illustrated iscomposed of three bars, I8, I9 and 20. The bars I8 and I9 are crossed intermediate their ends and-the corner edges 2I and 22 are welded transversely of the vface 23 of bar I8 as indicated at 24, Fig. 4, and the edges 25 and 26 of the bar I8 are Welded to the face 2l ofthe bar I9, as indicated at 28. is then placed within one of the angles formed between the bars I8 and I9 with adjacent faces 28 and 29 thereof contacting faces 30 ,and 3I of the bars I3 and I9. The corner edges `3l. and 33 of the bar 29 are then welded tothe face 3.I of the .bar I9, as .indicated at 34, and the corner edges `35 and 36 of the .bar I3 are welded to .the vface 29 of the bar 2IJ, .as indicatedat Y3'I. .When thus welded lthe bars are retainedinirigid .as- .'sembly at 'the' joint and the'contacting faces The bar 20 thereof are sealed against entrance of corrosive fluids which may ordinarily tend to produce electrolysis between the respective members of the jetty. While I prefer to weld the bars in assembly, it is possible to provide other fastening means, such as clamps'or the like, which do 4not result in weakening of the bars.

While the bars are rigidly secured at thei crossing points, the ends thereof are free to flex within the limits of the lacing and any stresses acting on the bars produces a bend therein substantially uniform throughout the length of the arms so that the strains are not localized at "any one point as in the case of structural mem- .bers -having flanges or members drilled and/or sheared to receive the lacing.

rAfter assembly of the bar members of the jetty,

the lacing 3 is applied in any suitable arrangement., While the lacing 3 may comprise wire or cable, I prefer to use a continuous length rod, as I find rods provide greater strength and `have a natural rust resistant surface. The rodlacing is also readily formable about the bar members of the jetty. The rod lacing is passed .between the fingers 'I and 8 of the anchors and is pref erably wrapped at least one turn about the body of the `arms as shown in Fig. 2. rThe -portionstof the rod lacing that extend about the bar contact the deformations 4 so that thedeforniations oooperate with the fingers 'I andt of .thexanchors to preventJ shifting of the lacing on'th'efarms .of the jetty. After the lacing has .beenapplied'the fingers 'I and 8 are bent over asshownv infFig. .3"

to close the space therebetween and .secrelyvretain the lacing therein. The ngers of-theend.- most anchors are likewise bent as shownin 3 to complete the jetty assembly.A "Ajetty thus assembled is of relatively lightweight, is .relatively inexpensive, has substantial strength, and is capable of withstanding the bufeting .effects to which jetties are subjected.

. A jetty constructed of material `above.described is more resistant to corrosion, the lacing is better` supported on the arms, and evenwhen theyare bent out of position, the arms still perform'their intended function.

Attention is also directed to the fact'that .the deformations' 4 provide additional surfaces `and projections for Acatching vdebris which facilitates ,retard ofthe current and hastens-the depsitl'zof silt through greater retardation of the'current.

While I have specicallyillustrafted 'and'.fde-

scribed bars or rods of substantially.square'cross section, it is to -be understood the inventiongpertains to any shape of reinforcing*barsof-rbdjlikel character. Y

I have particularly illus'tratedand vdescribed the lacing as attached by the anchors 5.orI-2, Vor the lacing may be attached by weldinglftfthe bars, or the deformations 4 mayprovide, vinmany instances, an adequate and positive ,anchorage for the-lacing. However, if ordinarily. smooth rods are employed in forming thefmembersbf the jetty, the anchors 5, or their equivalent,'are

essential in providing a positive anchorageloflthe lacing. A Y

What I claim and desire to secure by Letters Patent is: f V.

1. A jetty including a plurality of flexible rrodlike members having solid and substantially liniform cross section throughoutthe length thereof, means connecting the members together gto provide a plurality of radially:extendingfyieldable arrn'and leg portions, lacingconnectingrsaid-arm and leg portions, and lugs -projectingfrom thei means connecting the members together to provide a plurality of radially extending arm and leg portions, lacing connecting'said arm and leg portions, lugs projecting from the surfaces of said members to provide anchorage for the lacing,

portions, and lacing connecting said arm` and leg portions at points intermediate said deformations.

4. A jetty including a plurality of rod-#like members arranged in crossed relation, each comprising a reinforcing bar having projecting deforfmations a plurality of fingers projecting from surfaces of said members, lacing connecting said members and engaging said fingers, said fingers being bendable across the lacing for positively anchoring the lacing relatively tothe rod-like members. j

said lugs being formed without reducing the metal faces of the bar, means connecting the members together in crossed relation to provide a plurality of radially extending flexible armand leg 5. A jetty including a plurality of rod-like members arranged in crossing relation forming radially, extending substantially nexible arm and leg portions, U-shaped clips having bar portions welded to said members and having laterally projecting fingers forming lacing-engaging Dortions therebetween, and lacing wrapped about said members and passing through said lacingengaging portions of the clips, said fingers being bendable over said lacing to positively anchor the lacing on said members.

GEORGE W. REHFELD.

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