FR2484584A1 - TIGHTENING DEVICE FOR MULTI-TORON WATER CABLE - Google Patents

Abstract

THE INVENTION RELATES TO A CLAMPING DEVICE FOR A MULTI-STRAND GUY CABLE. FOLLOWING THE INVENTION, A DEVICE 10 FOR TIGHTENING A CABLE 18 INCLUDES A BLOCK 12, A STRUCTURE DEFINING, IN THIS BLOCK 12, AN OPENING RECEIVING THE CABLE 18, THIS STRUCTURE INCLUDING A PRACTICALLY FLAT SURFACE ON WHICH COMES ENGAGED THE CABLE 18, AS WELL AS AN ELEMENT INTENDED TO PRESS THIS SURFACE AGAINST THIS CABLE 18. THE INVENTION IS USED FOR THE WIRING OF RADIO, TELEVISION AND OTHER PUBLIC SERVICE PYLONES.

Description

The present invention relates to an apparatus for

  is useful for terminating stranded cables

  born and elongated of the type used for guying radio or utility towers. More particularly, the invention relates to a stop device of this type characterized by exceptionally high load limits, as well as their ability to transmit clamping forces in a substantially uniform manner.

  cable-stayed cable. In this respect, it has been found that,

  relatively to blocks with circular holes, we obtained

  benefits by practicing, in a block of ar-

  a non-circular hole in which a cable (preferably a hole defined by

  almost flat surfaces on which

secure a cable).

  Many large tower structures such as radio and television antennas, as well as utility towers for

  conductive cables, are erected and support

  using multi-strand wire and elongated guy wires. These cables are attached at their lower ends to anchor points

  buried in the ground near the location of the pylon.

  As can be understood, a critical characteristic

  that is to say that a secure connection must be established between the ends of the guying cables and the anchoring points on the ground, in particular, when the structure thus guyed is subjected to blows.

of violent wind.

  Stranded cables used for the purpose of

  are often made of metal strands.

  comprising coatings of great thickness and gathered in a stranding cable layers of a wire on one or more son constituting a central core. The use of conventional stop elements with cables of this type is far from optimal, because such stop elements do not provide,

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  generally not the total resistance of the cables, being

  given that the clamping force is not always trans-

  the metallic wires of the cable, so that the latter undergoes asymmetrical stresses and can not exercise the maximum capacity for which it has

been calibrated.

  So far, a number of

  Arrft structures. Generally speaking, these provisions

  sits contain an elongate cuneiform block and a

  co-operating in the form of a socket, the latter being

  positively attached to the anchoring point buried in the ground.

  A wire previously supplied to a helical wire is normally applied to the wire and

  extends on the cuneiform block. Specific devices

  Prior art disclosers are illustrated in U.S. Patent Nos. 4,066,368.

and 3,775,811.

  The shut-off device of the present invention is remarkably suitable for terminating multi-stranded guy cable tows and serves to substantially uniformly distribute the clamping forces on all strands of the cable, increasing

  thus the ability to maintain this termination.

  Preferably, the device for stopping and clamping the cable according to the present invention comprises a block, a structure defining, in this block, an opening

  receiving a cable, this structure comprising a sur-

  virtually flat face on which stengager cable, as well as an element for pressing this surface against a cable. Preferably, the opening receiving the cable is made in the form of an elongated hole passing through the block in its central part, while the pressing element comprises a socket housing having a complementary opening receiving the aforementioned block. Two metal clamping wires are also part of the preferred embodiment of the apparatus and each of these wires has respective parts which engage the cable by tightening it, while also being applied to the

cuneiform block.

  In more detail, the structure of the block advantageously consists of sections oppo-

  separated and each having a pre-configured configuration

  sensing two elongated, grooved, juxtaposed, substantially flat surfaces, oriented in a V configuration and on which the cable is engaged. Since then,

  mutually cooperating, these sections of the block defined

  a central hole receiving the cable and having a

  generally square cross section. It was de-

  finished that this configuration was improving so

  unexpectedly the capacity to maintain the apparatus of

  as opposed to using a section hole

circular cross.

  In other preferred embodiments,

  the sections of the block have an embroidering structure

  (for example, a tongue and groove system engaging one into the other) to prevent

  significant longitudinal movement of sections.

  In addition, the sections of the block include angularly oriented peripheral surface cavities

  to receive the respective parts in the form of

  key clamping wire so that the latter

  come in without any twisting or bending.

  These cavities have a depth sufficient to prevent significant pressure engagement between the parts

  metal wires in the form of loops and the box

  peripheral device forming a socket.

In the accompanying drawings

  FIG. 1 is an elevational view of a

  positive stop according to the invention installed positive-

  near the end of a guying cable and attaching it to an anchor point buried in the ground; Fig. 2 is a sectional view illustrating the embodiment details of the stopper of the present invention applied to a cable; Figure 3 is a partial end view of the stop device of the invention, some parts of which are removed for reasons of clarity; Figure 4 is a sectional view taken along the line 4-4 of Figure 2; Figure 5 is a side elevational view of a wedge-shaped block section forming part of the assembly of the stopping device; Fig. 6 is a side elevational view of the wedge-shaped block section shown in Fig. 5 but showing the opposite side of this section; Figure 7 is an end view of the section illustrated in Figures 5 and 6; and FIG. 8 is an elevational view of a multi-strand wire

  of the preferred embodiment of the arrester

of the invention.

  Referring now to the accompanying drawings, a stop device 10 according to the invention comprises, as a whole, an elongated wedge-shaped block 12 in two parts and of decreasing cross-section, a complementary socket housing 14, and a wire

  metal continuous clamping 16 with multiple strands.

  As clearly shown in FIG. 1, the device can be used to terminate an elongated cable

  of guying 18 by positively connecting the latter to.

  the upper end of a buried anchor

in the ground.

  In more detail, Block 12 is

  located two opposite and spaced sections 22, 24.

  These segments 22, 24 are identical (see FIGS. 5-7) and hereinafter will be described more specifically section ZZ. This section 22 has an enlarged end 26

  and a narrower end 28, this section decreases

  a cone from the end 26 to the end 28 as will be easily seen. In addition, this section 22 of the block has an inner face 30 and a face

  32 illustrated respectively in the figures

res 6 and 5.

  The inner face 30 has a pre-configuration

  sensing two elongated, substantially planar, angled surfaces 34, 36 relative to each other.

  the other and on which the cable is engaged.

  These surfaces extend over the entire length of the block from end 26 to end 28. In addition, the face

  interior 30 has two flat surfaces and allon-

  38, 40 of somewhat triangular configuration and respectively joined to the associated surfaces 34,

  36 from which they extend outward.

  An elongated central groove 42 extends from the end 28 towards the end 26 between the angularly oriented surfaces 34, 36. This groove 42 is intended to give the section of the block a certain degree of resilience when radial compression towards the inside. The outer face 32 of the section 22 of the block has a configuration having an elongate central rib 44 of decreasing cross-section, extending outwards, formed on either side of the groove 42 and having a rounded shoulder at the end. end 26. The edges of the face 32 are made in form

  of 46.48 elongated edges with a decreasing section, extends

  outwardly and ending in tabs 50, 52 at the widened end 26. Two cavities 54, 56 are formed in the face 32 between the rib 44 and the marginal edges 46, 48. In this respect, it is note that the cavity 54 has a first elongated portion 58 extending from the end 26, and a second elongate portion 60 connected to the

  58 and ending at the end of 28. It is

  Also, the end of the portion 58 which is adjacent to the end 26 is rounded as indicated at 62. Likewise, the cavity 56 has a first portion 64 having a rounded end 66 and pointing widened end 26 toward the narrower end 28 of the block 22. A second portion 68 is

  gathered at part 64 and ends at end 28.

  Parts 58, 60 and 64, 68 are angularly oriented

  in relation to each other for a purpose to be

described more clearly below.

  Preferably, sections 22, 24 of the block

  carry an interlocking structure preventing them from

  move longitudinally with respect to the

  be a significant distance when applied

  cable 18. In some embodiments of the present invention,

  this structure includes a rectangular tab

  an elongate gullet 70 extending outwardly from the surface 40, together with a groove or complementary cavity 72 formed in the ridge 46 and extending through that surface 40 near the lug 52. As shown clearly in Figure 2, the tongue 70 engages in the cavity 72 to fit the opposite sections 22, 24 one in the other.

  Housing 14 is in the form of a metal member

  74 having a frustoconical central hole 76 in which is housed the wedge-shaped block in two parts 12. In addition, this member 74 is traversed from side to side.

  part by two spaced holes 78, 80 receiving a stirrup.

  As clearly shown in FIG. 2, the holes 78, 80 are respectively disposed on the opposite sides.

of the central hole 76.

  Each metal clamping wire (see FIG. 8) consists of three wires juxtaposed and connected to one another 82. These wires have a configuration

  having a continuous portion in the form of a flattened buckle

  84 with respective arms 86, 88 and a loop-shaped portion 90. As shown in the drawing, the branches 86, 88 meet at closure of the loop 84 to form a single cable clamping portion. 92 of helical form with six wires. It should be noted that the number of wires 82 may be greater than or less than 3 (as shown in FIG. 8). When using the stop device, the sleeve housing is first inserted

  14 on the cable 18 by passing the cable through

  towards the central hole 76. Sliding the housing

  along the cable to a point far from the terminal

  desired, so that this accommodation does not

  no obstacle to the application of cuneiform blocks

shapes and clamping wires,

  The next step is first to

  Cections 22, 24 of the cuneiform block face to face around the cable 18, the respective tabs 70 being housed in the corresponding cavities 72. This operation is performed manually to initially maintain the sections of the block in place at this time. one of the clamping wires 16 is applied across the sections 22, 24 of the block, that is to say that the assembler first places the loop 84 in the curved and elongated cavity cooperatively defined by a cavity 56 practiced in one of the sections as well as

  opposite adjacent cavity 54 practiced in the other sec-

  tion. As clearly shown in Figures 2

  and 3, sections 22, 24 are thus brought together by the

  In the form of a loop 84, that is to say that the loop 90 of the loop 84 is engaged on the widened ends 26 of the respective sections 22, 24 of the cuneiform block, while connecting these ends, while the branches 86, 88 of the loop are housed in the corresponding cavities sections of the block. The helical portion 92 of the clamping wire 16 is then applied along the cable 18 by winding its turns around the latter in the usual manner. In this respect, it will be observed that the transition between the flattened loop 84 and the helical portion 92 of the

  cable is provided by the configuration cavities angu-

  54, 56 in the outer surfaces

  sections 22, 24 of the block. In this way, this transition is obtained without the clamping wire 16

  undergoes abnormal torsion or flexion.

  The second clamping wire 16 is then applied

  section 22, 24 and the cable

  18 as described above. During this operation

  ration, the sections of the block are fixed on the cable 18 so that they thus define, cooperating with each other, a central passage with a generally square cross-section through the block from one side to the other and receiving the cable (see FIGS. 3 and 4). The respective flat and elongated surfaces 34, 36 of each section

  to engage on the cable as shown in the

annexed.

  We then slide the housing forming

  socket 14 back along the cable 18 par-

  above the applied portions 92 of the clamping wire, and then over the sections 22, 24 of the block. In this respect, it will be seen that the loops 84 of the son of

  16 are not engaged by pressure exerted

  formed by the socket housing 14, but rather they are housed freely in the cavities

  sections of the block. The final application of the

  Sleeve 14 is to firmly engage it by hammering on the conical sections 22, 24 of the block. More specifically (see FIG. 3), the central ribs 40, 44 and the marginal edges 46, 48 engage by pressure and with a tight fit on the peripheral socket housing 14.

  The final step in the establishment of the

  tif 10 is to fix the housing 14 to a suitable assembly structure connected to the anchor point at

  20. Referring to FIG. 1, a conventional stirrup

  that 94 is attached to the upper end of the point of

  floor and this stirrup has branches

  spaced apart rings 96, 98 engaging in corresponding holes 78, 80 made in the body of the socket. Nuts 100 are used to complete the assembly in a well known manner. During the tightening of the nuts 100, it will be understood that the device 10 and the cable 18 undergo a strong tension for guying purposes. In addition, the sections 22, 24 of the block are compressed radially against the cable 18 through the central grooves 42 and the gap between the conical sections 22 and 24 of the block. In this way,

a safe termination is assured.

  It has been discovered that the stopper of the present invention is particularly advantageous when applied to cable-stayed cables.

  several strands of the type illustrated in the drawings

  nexes (see Figure 3). Previously, it was difficult

  it is possible to make the endings of this type.

  More specifically, conventional stop devices

  having circular openings receiving the cables

  can create a "bridge effect" in wires wrapped with multi-strand cables. In other words, conventional wedge blocks tend to penetrate the wires of the outer layer of the cable into the self-supporting tubular configuration,

  thus preventing the transmission of a significant

  complementary radial connection to the inner strands of the cable.

  However, according to the present invention, this problem is avoided since the non-circular hole receiving the cable and defined by the sections 22, 24 of the block creates a greater load in the cable by subtracting the outer strands of the latter from the relationship. inappropriate "bridge formation", thus allowing to exert a radial pressure on the inner strands of the cable. In summary, the stop apparatus of the present invention allows more uniform load distribution.

248 4584

  through the cable, so that the latter can be

  closer to its nominal strength.

  In real tests in which we compare the

  preferred embodiment of the present invention with a wedge-shaped block having a circular hole

  usual to receive cable, it has been observed that

  unexpected growths of efficiency of the order of 10

at 12%.

he

Claims (19)

  Cable clamping device, characterized in that it comprises a block; a structure defining, in this block, an opening in which is housed the cable, this structure having a substantially flat surface on which is engaged cable; and an element for pressing this surface against this cable.   2. Device according to claim 1,   characterized in that the structure defining an opening   ture has several nearly flat sides on   which comes to engage the cable.   3. Device according to claim J,   characterized in that the block comprises two sections op-   the structure defining an opening   opposite sides of these sections   cooperatively terminating the above-mentioned opening between these sections.   4. Device according to claim 3,   characterized in that the opposite faces each have a   configuration with two juxtaposed faces, practically   flat, angularly oriented, one   port to the other and on which comes to engage the cable.   5. Device according to claim 1,   characterized in that the block has an allon-   decreasing section, while the pre-opening quoted extends along this block.   6. Cable clamping device, characteris-   in that it comprises an elongate block,   a structure defining in the central area   trale of this block, a non-circular opening in which is housed the cable and which extends along this block; and   an element for pressing at least one   part of this structure defining an open this cable.   7. Device according to claim 6,   characterized in that the aforementioned opening is located practically in the center of the block.   8. Device according to claim 6,   characterized in that the structure defining an opening   ture comprises at least one elongated and practical surface   plane on which the cable is engaged.   9. Cable clamping device, characteris-   characterized in that it comprises: two elongated and opposed block sections cooperatively defining a configuration surrounding the cable which engages therewith; an interlocking structure provided on the sections of the block to prevent them from moving longitudinally relative to each other over a significant distance; and   an element with a view to pressing at least   respective sections of these block sections against this cable. 10. Device according to claim 9,   characterized in that the interlocking structure   door, on one of the aforementioned sections, an outwardly extending protrusion, as well as an element   defining in the other section an additional opening   in which this projection takes place.   11. Device according to any one of   claims 1, 6 and 9, characterized in that   takes a clamping wire having a first   the first part coming to engage the cable in the service   as well as a second part on the block.   12. Device according to any one of   1, 6 and 9, characterized in that the element   presser has a housing surrounding the block on which he comes to engage.   13. Cable clamping device, characterized rised in that it includes:   an elongate block having a defined structure   an opening in which the cable is lodged;   an element having on the outer surface   re of the block, an elongated cavity in which is housed the clamping wire, this cavity comprising at least a first and a second elongated section oriented angularly one with respect to the other; -   a clamping wire comprising a first part   tie on the cable by tightening it, as well as   that a second party coming to live in this house   quick; and an element for pressing, against the cable, at least a portion of the structure defining an opening. 14. Device according to claim 12, characterized in that the pressure element comprises a   housing surrounding the block on which he is   ger, the aforementioned cavity having a depth sufficient to receive the second portion of the clamping wire without resulting in a significant engagement by pressure between the wire and the housing.   15. Cable clamping device, characterized rised in that it includes:   an elongate cuneiform block with a decreasing section   plant comprising a central opening in which is housed the cable and which extends along this block, and two elongated cavities receiving the clamping wire and formed in the outer surface of this block;   this opening being defined at least partially   by several elongated generally flat surfaces on which the cable is engaged; a cable clamping member having a first and a second clamping wire each having a first portion engaging said cable by clamping it, and a second loop-shaped clamping portion being received in a corresponding cavity; - ponding practiced in the block; and a socket having a defining structure   a conical passage in which is housed, from   complementary, the wedge-shaped block mentioned above.   Device according to Claim 15, characterized in that the block comprises two sections   tapered cone each having a predetermined configuration   sensing at least one of the surfaces on which the cable is engaged, as well as half of each of the aforementioned cavities, the half-cavities formed on the opposite sections being generally in alignment with the ends of larger diameter of the sections so as to form in a cooperating manner, continuous cavities, the second parts of the metal wires coming   place in these continuous cavities by connecting the sec- block.   Device according to claim 16,   characterized in that it comprises a defined structure   a groove in one of the sections, and a tongue extending from the other section and   coming into the channel thus formed.   18. Device according to claim 15,   characterized in that it comprises a defined structure   two elongated and spaced grooves extending respectively from the smaller end   diameter of the block towards the end of larger diameter of the latter.   19. Device according to claim 15,   characterized in that the first part of the metal wires   It is helically shaped, while the second   and third parts extend from that first first part.