FR2623551A1 - IMPROVEMENTS ON SURFACES AND THEIR COMPONENTS - Google Patents

Abstract

The cable lines (1) forming the stay cable, mounted so as to be able to work and to be dismantled independently of one another, each consist of an assembly of parallel or twisted steel wires, surrounded by a sheath (3) in polyethylene, polyamide or a corrosion-resistant metal, with interposition of a filling material, such as an epoxy-type resinous pitch, or a wax. The ends of the cable lines (1), stripped of their sheaths (3) for their individual anchoring on a perforated block (6) are embedded in a protective grease. The grease chamber (A), formed by a sleeve (7) connected to the anchoring block (6), is closed by a stuffing-box seal (8) traversed by the cable lines (1), which are sheathed again, and comprising an outer plate (82) which, controlled by clamping rods (10) which can be actuated from outside the anchoring block (6), presses an elastomer cushion (83) against an inner plate (81) bearing on spacer rings (11) arranged in the chamber (A).

Description

Improvements to the shrouds and their components.

  The invention relates to cables or shrouds

  with high tensile strength and

  laid with a plurality of strands themselves constituted individually by sets of metal wires

parallel or twisted.

  It is more particularly, but not excluded,

  Among these guy lines, those which are intended to equip the guyed bridges by connecting the tops of the pylons of these bridges with their deck and their anchor blocks. It also targets the strands making up said shrouds. In the known embodiments of shrouds of the genus in question, the different constituent strands

  are usually collected in a pro envelope

  joint protection and linked to each other transversely by

  a grout or other hardened binder which fills the intervals

  between the strands and the envelope.

  The presence of this binder by itself provides protection of the different strands against corrosion and, associated with the presence of suitable rigid transfer parts, it promotes the transfer of forces from the strands to the anchoring parts independently of the anchorages.

individual of said strands.

  However, this formula also has a certain number of drawbacks such as the high weight and the stiffness of the shroud, the risks of cracking of the hardened binder and above all the fact that the shroud constitutes a

  monobloc assembly: it is therefore not possible to replace

  individually place the strands that compose it in

  the case where only some of these strands are dete

  improved, for example following an impact from a vehicle

  or vehicle loading against the guy line.

  The object of the invention is, above all, to remedy

these disadvantages.

  To this end, the shrouds of the type in question according to the invention are essentially characterized by

  what the different strands that compose them are pro-

  sheathed independently of each other and

  are mounted so that they can work. and be de-

  mounted independently of each other, in that the protective sheath of each strand is interrupted at each of its ends, the stripped end of this strand being individually anchored on a perforated block

  the periphery of which is applied axially against a door

  annular tee of an anchor structure and is connected

  to a sleeve and in that the chamber formed therein

  laughing of this sleeve and containing the end sections of the sheaths is filled with a grease or similar material ensuring the protection of the stripped ends of the

  strands, and is sealed by a press

  cable gland tightly crossed by the cheerful ends

born from said strands ..

  In preferred embodiments, it has been shown

  in addition to one and / or the other of the following provisions: - the different strands making up the converging shroud

  slightly from their ends anchored up

  than a guide collar beyond which they are joined together so as to form a bundle of parallel strands, - each strand is constituted by a set of steel wires embedded inside a protective sheath with possibly interposition of a filling material,

  - the material according to the preceding paragraph is a resi

  epoxy type sockets, - the sheath is made of polyethylene,

  - the sheath is made of a corrosion-resistant metal.

  The invention comprises, apart from these arrangements

  main provisions, certain other provisions which are preferably used at the same time and which will be

  more explicitly question below.

  In the following, preferred embodiments of the invention will be described with reference to

  drawing appended hereto in a way of course not limited to

tive.

  Figure 1, of this drawing, shows, upper half

  higher in schematic axial section and lower half in external view, the head of a shroud established according to the invention. Figure 2 shows in axial section on a larger scale a terminal portion of a head similar to the

former.

  Figure 3 is an enlarged cross-section

  a guy like the one cut according to III-III, fig-

  re 1. Figure 4 is an enlarged cross section.

  of one of the constituent strands of said stay.

  The shroud considered is composed of a plurality

individual strands 1.

  The number of these strands is generally less than

  laughing & 100, preferably being between 15 and 70.

  Each strand 1 is itself formed by a plurality of

  elementary son 2, for example 7

  in the embodiment illustrated in FIG. 4.

  These wires can be parallel or twisted:

  in the latter case, the corresponding strands are gener-

  usually referred to as 'strands'.

  The wires 2 are for example made of drawn and galvanized steel; All of these wires are surrounded by a protective sheath 3 which is able to protect them during

  against corrosion caused by inclement weather

  laughs or other external aggressions, and in particular

humidity and handling.

  This sheath is for example made of a plastic material, such as polyethylene, or a

  metal such as aluminum or stainless steel.

  It can be reported directly on the

wire harness by extrusion.

  The sheath in question can also be made up of

  killed by any other desirable coating of the wire harness 2, for example by an epoxy paint coated on

this one.

  The intervals between the wires 2 and the sheath 3, if they exist, may or may not be filled with a protective substance 4 such as, for example, a

Epoxy resinous pitch.

  Each strand 1 is manufactured in the factory and is available from this factory in the form

of a building site coil.

  We therefore provide for the thickness of the sheath 3 a value low enough to make possible the winding of the strand: if it is a metal, we give

  at said thickness a value of the order of 1/10 mm.

  The sheathed strands 1 thus defined, all identified

  between them, are autonomous and remain so for

  the whole life of the shroud they constitute.

  The assemblies of these sheathed strands on the struc-

  anchoring tures are provided individually in a manner known per se, for example using sleeves

  or, as illustrated, by tightening the ends

  stripped mites of said strands in split jaws 5: each jaw 5 has on the one hand a cylindrical internal bore suitable for contiguously surrounding the end of the strand to be anchored, and on the other hand an external surface

  frustoconical suitable for cooperating with complete housing

  hollowed out in an anchor block 6.

  The terminal section T of each sheath 3 beyond

  from which begins the stripped end of the strand 1 cor-

  respondent is located inside a chamber A delimited: - at an axial end, by the block 6, - transversely, by a rigid sleeve 7 extending the periphery of the block 6 and fixed to it using screw 18, - and at the axial end opposite the block 6, by a cable gland 8 crossed in leaktight manner by the

  sheathed strands 1 and applied radially tightly

  che against the inside of the sleeve 7.

  This cable gland 8 includes two perfo-

  transverse lines 81, 82 between which a cushion 83 made of elastomeric material or the like is interposed, and

  means of bringing the two places together

  ques, which inflates the cushion ensuring the

desired seals.

  These means of reconciliation work in particular

  by screwing, then including 9-piece locks

  from outside the block 6 and mounted on ti-

  threaded ges 10 themselves fixed on the plate 82 furthest from said block, the plate 81 closest to

  this block being kept separated from it by bas-

  spacers 11 surrounding the rods 10.

  Chamber A communicates by a channel 12 with a chamber B provided outside of block 6 and delimited by a cover 13 applied contiguously against this

block, by tightening screws 14.

  All of the two chambers A and B are filled at the end of the anchoring of all the strands 1 on the block 6

  by a grease or the like having simultaneously

  the following properties: flexibility, low adhesion

  rence vis-à-vis the strands and their bare ends

  protection of these ends against corrosion.

  Around sleeve 7 or block 6 is added,

  especially by screwing along complementary threads

  these two elements, a ring 15 suitable for

  place itself axially against an annular bearing

  16 being part of a structure 17 anchoring the top

  ban, structure such as a pylon top or a

massive on the ground.

  The portions, strands 1 stretched, which are dis-

  placed outside the grease box A, B, can be parallel to each other and be directly vented

free.

  However, we prefer to make them converge slightly-

  ment from block 6, to a point arranged & a distance generally between 1 and 3 m from the block, using a guide collar 19 located at this point: beyond said point, the strands 1 are gathered in a bundle of contiguous strands, as well as visible on the

Figures 1 and 3.

  So that the collar 19 can be easily disassembled, which makes it possible to separate each other

  strands 1, it is advantageously constituted by two half

  shells can be assembled and separated at will.

  The beam can be left in the open air or

  itself be protected by an envelope 20 of all kinds

  desired size and dimensions, for example polyethylene

lene.

We still see:

  - in Figure 1, a number of tubes and connectors

  cords some of which have truncated sections

  ques, connecting, some, such as 22, the sleeve 7 to the envelope 20, and the others 23,24,25, the bearing surface 16 around the envelope 20, - and in FIG. 2, sockets or furs 26 made of plastic, in particular polyamide, interposed

  between the stripped portions of the strands 1 and the bores

  ges hollowed out in block 6 to allow sliding-

  relative elements, and a perforated plate 27 traversed - by the stripped ends of the strands and interposed axially between the enlarged bases of the sockets 26

and the wedges 11.

  It should be noted that the only metal contacts

  metal produced between each strand 1 and its environment are located at the level of the individual anchors (jaws 5 in the illustrated case): the other elements which are in contact with these strands are the furs 26 and the

cushions 83.

  Each strand can therefore be considered as tota-

  fully autonomous over its entire length and can be stretched

  or relaxed regardless of its neighbors.

  In the case where such individual relaxation of each strand 1 is envisaged, it may be useful to give the free ends 21 (FIG. 2) of these strands, which protrude beyond the anchoring members, a greater length. than the one shown, for

  facilitate the grip of these ends.

  As a result of which, and whatever the mode adopted, we finally have a guy

  whose constitution and assembly are sufficient

ment of the above.

  This guy has a number of advantages over those previously known and in particular the following: - each of the individual strands 1 which make up the guy

  can be replaced independently of the others, i.e.

  even say that all the other strands remain

  tensioned, which allows to intervene on the equi-

  pe of said stay cable without interrupting the operation of this structure, and in particular the traffic if it is a bridge,

  - the weight of the stay cable is relatively low, given the additional

  pressure of grouts or other hardened binders of reali-

  previous sations, - the longevity of the shroud is increased, given the elimination of the risks of cracking inherent in the grouts and the high quality which can be conferred in the factory on

  individual protective sheaths for the strands.

  As it goes without saying, and as it results from

  their already from the above, the invention is not limited

  in no way to those of its modes of application and implementation

  which have been more specifically contemplated; she in

  embraces, on the contrary, all variants.

9-

Claims (6)

  1. Guy line composed of a plurality of strands themselves   same formed individually by sets of parallel or twisted metal wires, characterized in that its different strands (1) are protected by sheathing (3) independently of each other and are mounted   so that they can work and be dismantled independently   each other, in that the sheath of pro-   tection (3) of each strand (1) is interrupted at each of its ends, the stripped end of this strand being individually anchored on a perforated block (6) the   periphery is applied axially against an annular bearing   area (16) of an anchoring structure and is connected to a sleeve (7) and in that the chamber (A) formed at   the inside of this sleeve and containing the ter-   sheaths (T) of the sheaths (3) is filled with a grease or similar material ensuring the protection of the stripped ends of the strands, and is sealed in a sealed manner by a cable gland (8) traversed in a sealed manner by the   sheathed ends of said strands.   2. Guy line according to claim 1, characterized in that the different strands (1) which compose it   converge slightly from their ends an-   created up to a guide collar (19) beyond which   they are joined together so as to form a bundle ceau of parallel strands.   3. Guy line according to any one of the claims.   1 and 2, characterized in that each strand (1) consists of a set of steel wires (2) embedded in   the inside of a protective sheath (3) with possible-   Lement interposition of a filling material (4).   4. Guy line according to claim 3, characterized   in that the filling material (4) is a pitch- curvy epoxy type.   5. Guy line according to any one of the claims.   tions 3 -and 4, characterized in that the sheath (3) is made of polyethylene.   6. Guy line according to any one of the claims.   tions 3 and 4, characterized in that the sheath is in one corrosion resistant metal.