US2021575A - Multiple strand cable anchorage - Google Patents

Description

Nov. 19, 1935. E. J. LLOYD MULTIPLE STRAND CABLE ANCHORAGE 2 Sheets-Sheet 1 Filed Jan. 25, 1954 V INVENTOR.

E'LMEE JOHN LLOYD, y" m #49 ATTORNEYS.

' NOV. 19, 1935. 5, JV LLOYD 2,021,575

MULTIPLE STRAND CABIJE ANCHORAGE Filed Jan. 25, 1934 2 Sheets-Sheet 2' 20 15 /5 E i T1: 1 @JM I a V Hill I/ h I i a I] "I II, a 5 W h. 'mhf 7 2'0 /'9 l5 g 7: M 4 y E /5 a;

. I I 4/ 5 i 9 ;\\"|'|||'||T 1N VEN TOR ELMEE JOHN LLOYD,

Patented Nov. 19, 1935 PATENT OFFICE 2,021,575 MULTIPLE STRAND CABLE ANCHORAGE Elmer John Lloyd, Worcester, Mass, assignor to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Application January 23, 1934, Serial No. 707,981 4 Claims. (01. 14-21) My invention relates to multiple strand cable anchorages oi the type used to anchor suspension bridge cables. These cables are composed of a number of parallel strands, and it is necessary that each be firmly anchored in such manner that individual tensioning is possible. Hence, such anchorages are usually rather complicated, one typical example including a lot of loose bearing members which are mounted by pins passed through spaced anchorage plates, and which engage the various strands, the latter being socketed for this purpose.

Now the fitting of these bearing members into their proper positions is a rather complicated procedure. Also, angularity of the various strands, due to their necessarily splayed arrangement, cannot be accommodated except by allowing the strands to bend around the: various bearing members, this causing strain at points closely adjacent the sockets and thus introducing undesirable stresses.

Therefore, oneof my objects is to provide a simplified anchorage which provides for the angularity of the various strands without bending them respecting their various connections with this anchorage. Other objects may be inferred from the following disclosure of an anchorage embodying the features of my invention.

Referring to the accompanying drawings:

Figure 1 is a side elevation of the anchorage.

Figure 2 is an enlarged top View.

Figure 3 is a sectional side view of Figure 2.

Figure 4 is an enlarged to-p sectional view of one of the center strand sockets.

Figure 5 is a vertical section from the line V--V in Figure 4.

Figure 6 is a cross-section from the line VI-VI in Figure 5.

Figure '7 is an enlarged top sectional view of one of the outer strand sockets.

A plurality of vertical laterally spaced anchorage plates I are positioned by a common pin 2 which is arranged at their back ends, this pin connecting them to anchoring bars 3 which are suitably fixed in the ground. A plurality of pins 4 are transversely positioned by the plates I in vertically spaced and parallel relationship. This may be done by passing the pins through alined holes formed in the front portions of the plates.

Strand sockets 5 of special construction are arranged between the plates l in vertical and transverse rows. The pattern formed by these sockets is determined by the requirements of a multiple strand cable 6, which is the one to be anchored.

This cable is provided with the usual splay casting 1, the various strands 8 being connected to the sockets 5 in any convenient manner.

The sockets themselves are constructed to provide longitudinally elongated transverse openings 9 through which the pins 4 are passed, and ver- 6' tical openings H] which extend into these transverse openings. More specifically stated, the sockets are steel castings or iorgings providing conical baskets II and solid back ends I2 having flat right angular insides, these parts being inter- 10 joined by frames I3 in which the openings 9 and 10 are formed by oppositely arranged holes of suitable shapes. Their ends l2 are provided with ears l4 for engagement by the usual pulling jack I5, the latter working against jack rods [6 propl5- erly positioned for this purpose.

Continuing, the elongated transverse openings 9 are of an extent permitting sufficient longitudinal movement of the sockets during tensioning of the strands 8 by means of the jack IS. The ver- 20 tical openings H] are adapted to receive inserts ll, these being shaped for insertion in these openings Ill and having top flanges l8, which prevent them from dropping completely through the openings, and pin grooves l9 positioned to bear 25 against the pins 4 when the inserts are in position. Also, the inserts have flat backs which bear against the flat insides of the solid ends [2 of the sockets, and their pin grooves l9 are formed at various angles respecting their flat backs so that 30 the sockets may assume various canted positions.

Thus, the sockets may pivot on the pins 4 to accommodate strand angularity in a vertical plane, while the angular grooves in the inserts hold the sockets at properly canted positions to 35 provide for strand angularity in the opposite plane. In the few instances where the sockets are alined with the cable proper, the grooves are parallel with the backs of the inserts.

It is obvious that the strands are never bent,

the inserts l1 functioning as pivotal bearings working against the pins with the sockets at various properly canted positions. The extent of the cant of the sockets is determined by the angu- 45 larity of their respective strands as determined by the latters splayed positions, the angularity of the grooves l9 being properly proportioned to accomplish this purpose.

Other inserts 20 of varying thicknesses are con- 50 structed for insertion between the inserts l1 and the ends l2 of the sockets 5. These last inserts function as shims and are used to vary the positions of the sockets 5 according to the required tensions. They also have top flanges 20 to pre- 55 vent them dropping from place when once positioned.

The installation of the anchorage just described is rather obvious. The sockets are positioned in horizontal rows with the inserts I! in place, the inserts 20 of suitable thicknesses being dropped vertically into the openings I0 during the tensioning of the respective strands. The installation of the bottoinmost row of sockets first, and then the installation of the successive rows, permits the vertical placement of the inserts 20 during the shimming operation. The various sockets in each row may be installed one at a time, and the respective pins 4 driven through the required amount to connect each successively positioned socket.

It is apparent that the angularity of the grooves in the inserts may be previously determined, the splay and pattern of the various strands composing the cable being known. It might be advantageous to mark the inserts having the pin grooves to show their proper positions, thus avoiding possible confusion in the field.

The terms strand and strands used throughout this specification and the following claims are intended to mean any arrangement or arrangements of Wires forming a unit of a cable consisting of a number of the same. That is to say, the term strand is intended to mean either a unit assembly of wires helically and regularly twisted in a geometrical arrangement, or a plurality of such unit assemblies helically twisted with a uniform pitch about a common axis.

I claim:

1. A multiple strand cable anchorage including the combination of spaced anchorage plates, a plurality of laterally spaced pins transversely positioned by said plates, strand sockets arranged between said plates and having transverse openings through which said pins are passed, and angular inserts engaged by said sockets and bearing against said pins, said sockets pivoting on said pins to accommodate strand angularity in one plane and said inserts functioning to cant said sockets so as to accommodate strand angularity in an opposite plane.

2. A multiple strand cable anchorage including the combination of spaced anchorage plates, a plurality of pins transversely positioned by said plates, strand sockets arranged between said plates, said sockets having transverse openings through which said pins are passed and insert receiving openings extending into said transverse openings, and inserts in which pin grooves are formed at varying angles, said inserts being arranged in said insert-receiving openings in said sockets in engagement with the latter and with their pin grooves bearing against said pins, said sockets pivoting on said pins to accommodate strand angularity in one plane and said inserts functioning to cant said sockets so as to accommodate strand angularity in an opposite plane.

3. A multiple strand cable anchorage including the combination of a plurality of vertical laterally spaced anchorage plates, a plurality of pins transversely positioned by said plates in vertically spaced parallel relationship, strand sockets arranged between said plates, said sockets having longitudinally elongated transverse openings through which said pins are passed and vertical openings extending into said transverse openings, and inserts of varying thickness and in which pin grooves are formed at various angles, said inserts being shaped for insertion in said vertical openings in said sockets so as to engage the latter with their said pin grooves bearing against said pins, whereby they function as shims and to form angular pivotal bearings Working against said pins with said sockets at various canted positions.

4. A multiple strand cable anchorage including the combination of spaced anchorage plates, at least one pin transversely positioned by said plates, strand sockets arranged between said plates and having transverse openings through which said pin is passed, and angular inserts engaged by said sockets and bearing against said pin.

ELMER JOHN LLOYD.

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