US2198809A

US2198809A - Bridge cable anchorage

Info

Publication number: US2198809A
Application number: US169368A
Authority: US
Inventors: Ralph W Finke; Elwell Bess Williams
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-10-16
Filing date: 1937-10-16
Publication date: 1940-04-30
Anticipated expiration: 1957-04-30

Description

Aprnao, 1940.

R. W. F|NKE ET AL BRIDGE CABLE ANCHORAGE Filed Oct. 16, 1937 BY mm" ATTORNEY April 30, 1940. R. w. FrNKl-z ET A1.

` BRIDGE CABLE ANGHORAGE 2 Sheets-Sheet 2 Filed oct. 16, 1937 INVENToRS M n m W. m m

mi m f D" N M A U5 n @fm f u s M ML MX MOU I L m of Patented Ape so; 1940 .WUNITED ASTATES PATENT oFFIcI:

` Italph` W. Finke, Olympia, Wash.,`and Otto Rae .ElwelL deceased, late of Olympia, Wash., by

Bess Williams ElwelLOlympia, Washl, execu- Application octberiaissz serial No. 169.363

` o o l l 12 claims. (ol. 11i- 21)` o 'I'he present inventionrelates to animproved elty and scope of `theinvention 1Awillbe pointed anchorage for a multiple `strand cable infwhich provision is made for anchoring and adjusting the `tension of leach strand individually.

The invention isparticularlyadapted for anchoring `bridge cables,` althoughmanifestly the" tively short span it is desirable to make up the cable of preformed strandscut to uniform length andprovided with end fittings in the factory.

A Each strand must be individually tensioned to be f sure :that it will carry its full share ofthe load.

While in the main body of `the cable the strands are compactly bundled together they must be splayed out at the anchorage `to provideroom forcthe end fittings and for the tensioning and `anchoring means. l

` One `object of the present invention is to pro`` vide avery simple and very compact anchorage". `in winch` the splay` angle will Ybe reduced to a minimum` thereby keeping themaximurn bend in anystrand well within `its elastic limits.

` fAnother `object of the invention is theprovision `of a universal connection between each strand and the anchorage providing for a straight `forwardpull of the bearing block against its pivot support' in the anchorage and also providing for lateral` adjustment of the strand socket to prevent any bending of the strand at the point of connection with itsA socket.` o A further object of the invention is to provide yan anchorage in which the parts will be readily accessible for tensioningthe strands in such sequence as to prevent `skewing and unbalanced strands. `In orderto `accomplish this result it is desirable to "arrange the strands in vertically spaced `horizontal tiers, and in anchoring the` strands it is desirableto start with `the bottom tiers to tension first the strands which lie directly on `the/saddle of the bridge after which the other tiers` may be progressively tensioned and anchored. `in each` tier it is preferable to tension Fig.` 3f Obviously the number of strands may grooves in the casting `are preferably slightly out in the claims. f

In the accompanyingv drawings;

Figure l. is a view in side elevation of the ap-` proved anchorage assembly wth a concrete abutment` of the anchorage indicated fragmentallyw and `in section and with one of the anchorage plates of the anchorage frame work broken away toshow` a side viewV of a `strand socket and shoe and mounting therefor;` -Fig. 2 is a top plan view ofthe anchorage frame showingV the :strandsockets and shoes of` several strands mounted in position between adjacent anchorage plates; l '3 Fig. 3 is a front View of the anchorage assembly u taken `on the line 3-4-3 of Fig. 1;

"Fig 4 is a longitudinal section on an enlarged scale of a strandsocket and shoe taken on the line ll-iofFigl; and

Fig.` 5 is a detailed perspective View of a stran socket and shoeshown disconnected.

`'Ihencable I illustrated inthe drawings `is mad up o1 nineteen strands Il; as shown clearly in be varied as desired and the anchorage correspondingly modified The strands `are nested together `in the main body of the cable, as` shown in Fig. l, and are passed through a splay casting I 2 which is preferably suitably grooved to con` form to the outer contour of` the cable. Thera() flared toward the anchorage to permit site splaying of the strands. l p

The strands adjacent the anchorage are preferablygrouped? in five vertically spaced rows, as shown inFig. 3,` the middle row comprising five the requistrands, the next adjacent rows four strands each and the top and bottom rows three strands each. `Each strand is provided` with an end tting consisting of a strand socket `member I4, and a strand shoe I5. Each strand socket member comprises a tapered `socketin which the strand may be permanently fixed by means well known in the art as, forinstance, by brooming the end of therstrand and embedding the same in a mass of solder or other suitable metal. Each strand socket member is `provided with vertically spaced rearward-` ly extending arms l provided with pivot holes,

as indicated. The forward portions of these arms `are preferably of less width than the diameter of thelarge end of the socket, as indicated at l1, to permit free lateral swinging movement of the strand socket member i4 within theanchorage frame, as clearly indicated in Figs. 2 and 3.. The strand socket member is connected by a u pivot rod 22 upon which the strand shoe is mounted for sliding movement longitudinally and for pivotal movement in a vertical plane. Mounted within the slot is a bearing block A,23 for cooper-` ation with a pivot rod22. Thefrear portion of the strand shoe is of rectangular forml and isa widened laterally to provide a laterally extended abutment 2e for the bearing block. As vdisclosed clearly in Fig. 2, the forward end of the strand yco ` this purpose are shoe is provided with parallel side faces having a sliding tfengagementwith the adjacent side plates '25 of the `anchorage frarrie. U-shaped shims 26 are inserted between -the bearing block and abutment 2li to'holdth'e strand shoe I5\in the vrearward position to vwhich it has been adjus'ted by means of a threaded adjusting bolt-'21 which is threaded in the rear end 24 of the strand shoe and bears against the bearing block l23. The upper and lower walls of the slot 2| aref provided with vparallel `side faces to accommodate a' plurality of similar shims l 'In connectingthe strands tothe anchorage frame, the lowerrowof strands may be tensioned'a'nd pulled to the rear by a block and tackle into a position in which the cooperating pivot rod 22 may be passed throughthe slots in the shoes connected to these strands. The adjustment of each strand is then effected by turning the adjusting bolt 21 whichbearson the bearing block 23 thereby pulling the strand shoe toward the rear 'until the strand has been adjusted to the desired tension. The proper number of shims are then inserted between the bearing block and the rear end 'of the strand shoe after which the adjustingfscrew may be partiallywithdrawn.V

The anchorage frame disclosed comprises six anchorage plates 25, the four plates in the center which support the pivot rod 22 for the upper row of strand shoes being of greater vertical dimension thanrthe side plates. v

The. plates 25 ofthe anchorage frame may be secured together by L-shaped vertical bars 28 located to the rear of the pivot rods 22, spaced U-shaped bars 29 connecting the forward ends of the central plates and by oppositely facing spaced U-shaped bars 30 placed back to back and connecting the forward ends of the side plates to the adjacent plates. tend below the anchorage frame proper to support the `frame on la concrete anchorage, asindicated in Fig. 1.. The anchorage frame is preferably also braced by the pivot rods 22 which for provided with heads and nuts,

as shown.

The rear ends of the plates 25 may be provided with holes 3| to receive a pivot rod 32 on which may bemounted anchorage links 33 suitably connected to and embedded in the concrete anchorage, as indicated. Each of the outside plates 25 maybe provided `with two vertically extending bars 34 reinforcing the walls of the holes in these plates and each of fthe inside plates may be faced with plates 35 to reinforce the holes in these plates.k v Q By referring to the various figures of the drawings it will be noted that by ltheprovision of a 2,198,809 l rv universal joint which comprises a forward vertical pivot and rearward horizontal pivot, the plates of the anchorage frame may be spaced closely thereby reducing the transverse width of the anchorage frame to a minimum resulting in the length ofthe block and rod. By providing the strand socket members with reduced portions,

.ing the plates of the anchorage frame, ther bear- I ing contact of the bearing block against the co- .operating pivot rod will be uniform throughout as indicated, freepivotal movement of the strand I sockets is permittedwithout interference by the plates of the anchorage frame whereby each strandl socket may adjust itself laterally to the directionfof the strand to 'which it is secured to prevent any ybending of the strand at the point where it is secured to the socket.

While a `preferred embodiment of the invention has been shown and described it will be under; stood that thislisto be taken as illustrative and not limitative and that :the right is reserved to make various changes `in form, construction and nected to said strands and pivotally connected to said shoes to' accommodate strand angularity in a plane at right plane.r i.

2. In a multiple strand cable anchoragegthe combination. vof spaced anchorage plates, at least one pivot rod positioned ltransversely lby said plates, strand shoes each arranged between said plates and having a transverse opening through which said pivot'rod is passed and havingvside faces cooperating with the faces -of acl-jacent means connectedrto thev strand andv pivotally angles to said first-mentioned mounted on the forwardend of said shoe providing for pivotal ,movement ofsaid means laterally of said shoe yand plates. f I

. 3. In a multiple strand cable anchorage, theV combination of spaced.anchorage'plates, atleast one pivot rod positioned' transversely by said plates, strand shoes each arranged between said plates and having a transverse opening through which `said pivot'l rod is passed and having side faces' cooperating with the faces of adjacent plates, a bearing block in said opening, means connected to the strand `and pivotally mounted on the forward end of said shoe providing for pivotal movement lof said means laterally c f said shoe and plates,and means on said pivot rod cooperating with said plates to maintain the cooperative relationbetween the faces of said` shoes and the faces of said plates.

4. Means for anchoring a strand comprisinga strand socket and a strand shoe, a pivot connecting said strand socket and strand shoe for movementr in one plane, said strand shoe being provided with an lelongated opening extending trans- Wversely thereof at right angles to the axis of said pivot to receive a pivot pin and bearing block for pivotally supporting said strand shoe for movement in a plane at right angles to said `first mentioned plane, and a bearing block in said opening. r

5. Means for anchoring a strand comprising a strand socket and a strand shoe, a pivot connecting said strand socket and strand shoe for movement inone plane, said strand shoe being provided withan elongated opening extendingtransversely thereof at right angles to the axis of said pivot to receive a pivot pin and bearing block for pivotally supporting saidstrand shoe for movement in l `a plane at right angles to said first mentioned.

plane, a bearing block inv saidopening, and an adjusting and tensioning screw mounted centrally in the rear `end `of said strand shoeA andextending within said opening and against said` bearing block.

6. Means for anchoring a strand comprising a strand socket and a strand shoe, a pivot connecting said strand socket and strand shoe for movement in one plane, said strand shoe being provided with an elongated opening extending transverselythereoi in a direction at right angles to the axis of saidpivot to receive a pivot pin and bearing block to support the strand shoe `for movementin a `plane at right angles to said iirst mentioned plane, a bearing block in said opening, and `laterally extending shoulderson the rear end of said shoe providing an abutment for U-shaped shims for said bearing block.

7. Means for anchoring a strand comprising a strand socket and a strand shoe, `a pivot conx necting said strand socket and strand shoe for movement in one plane, said strand shoe being provided with an elongated opening extending `transversely thereof in a direction at right angles t the axis of said pivot to receive a pivot pin and `bearing block to support the strand shoe for movement in a plane at right angles tosaid iirst mentioned plane, a bearing block in said opening, laterally extending shoulders Aon the rear end of said shoe providing an` abutment i'or` U- shaped shims for said` bearing block,` and an adjusting and tensioning `screwmounted centrally in the rear end` of said shoe and extending into said opening `against said bearing block.

8.v Means for anchoring a strand between parallel plates of an anchorage frame comprising a strand shoe, a strand socket, a pivot connecting said socket to said shoe for movement in a plane transversely of said plates, said shoe having provision for mounting the samefor pivotalmovement in a plane parallel to said plates and guid-` lsecond mentioned planes.

, strand, a rear member, a `pivot connecting said frontmember to said rear member for movement of said front member in aplane transversely of said plates, said pivot being located rearwardly of and adjacentto the forward edges of said plates,

"and a pivot between said rear member and said plates for movement ofjsaid rear member in a plane parallel to said plates, said rear member being provided with side faces located forwardly of said second mentioned pivot, slidably engaging the faces of adjacent plates, and said front member having` its forwardstrand connecting portion extended beyond the forward ends of said plates and having its side walls cut away to clear said plates to permit oi extended pivotal `movement of said iront member transversely of said plates.

lo; An anchoring frame comprising spaced plates, a pair of cables arranged transversely of said plates, end fittings on said cables, means pivotallysupporting said end ttings between said plates, and means located forwardly of said supporting means spacing said end iittings` and providing for unrestricted individual pivotal movement of said end iittings.

ll..ln combination with an anchorage frame,

` a` pair of cables, shoes for said cables pivoted on said frame for pivotal movement in parallel planes, sockets secured to said cables, means pivotally connecting said sockets to said shoes for pivotal movement in a plane at right angles to the planes ci movementof said shoes, and means spacingsaid shoes at the pivotal connections between said` sockets and shoes.

l2. In combination with an anchorage frame, a pair of cables, sockets secured to said cables, shoes pivotally supporting said socketsfor movement in a common plane, means pivotally supporting said shoes on said frame for movement in planes at right angles` to said first mentioned plaire, and means` spacing said shoes and providing for relative movement of said shoes in said RALPH W. FINKE. BESS WILLIAMS ELWELL,

lt'atecutrix of the last will and testament of Otto Rae EZweZZ, deceased, Zate of Olympia, `county of Thurston, State of Washington.