KR20070101489A - Device for fixing a structural cable to a construction element - Google Patents

Abstract

A device for fixing a structural cable to a structural element is provided to fix a structural cable to a structural element simply and conveniently by coupling an anchoring block to a clevis. A device includes an anchoring block(12) fixing front ends of strands of a cable(10) with a wedge, and a clevis(13) generating an articulating motion for the structural element and having a head(14) provided with a screw hole(15) to couple the anchoring block and two side walls(16) formed by arms extended from the head, wherein the screw hole has a female screw to fasten with screws(21,37) formed on the anchoring block and a collar(27) to support the anchoring block when tensile load is added on the cable.

Description

Device for fixing a structural cable to a construction element

1 is a longitudinal schematic cross-sectional view of a fixing device according to the present invention;

2 is a perspective view of a clevis of the fixing device according to the present invention;

3 is a cross-sectional view showing an example of means for securing and protecting a stay in the device shown in FIG. 1;

4 is a sectional view of another example of the protective means.

※ Explanation of code about main part of drawing ※

10: strand 12: fixed block

13: clevis 14: head

15: hole 15: screw hole 16: side wall

17: arm 18: support

19: Joint pin 21: Screw

24: jao 25: chamber

26: cylindrical side wall 27: stop member

28a, 28b, 28c: plate 29: elastic pad

30: loading

31: nut 32: gap member

34: chamber 35: cap

36: inlet 37: screw

40: protective tube 41: gasket

44: piston 45: member

46,47: screw

The present invention relates to the field of use of cables in construction work.

There are cases where it is necessary to fix a cable under tension to a structural element. As used herein, "structural cable" means a bundle or group of cables that are generally parallel to each other, and each cable constituting the bundle of cables consists of one or more basic strands. Can be. An important field of application of the invention is that it is applied to a stay which serves to support the bottom plates of the cable-stayed bridge.

Such stays consist of a parallel bundle of strands fixed by fixed blocks at both ends. In general, the fixing block has a through hole for passing each strand, and in each through hole, the strand is fixed by a wedge by a conical jaw cut off.

In a typical embodiment, the bottom plate of the cable-stayed bridge is made of concrete and the fixing block is supported by a plate located at the lower inlet of the coffering tube passing through the concrete bottom plate. The stay is screwed into this copper ring to reach the stationary block. A guide tube comprising a deflector is connected to the upper end of the copper tube, which deflects the strands slightly apart, allowing the strands to separate from each other in blocks sufficient to act as fixed, while on the other hand This allows the stay to absorb strain stresses. Another protective tube outside the guide tube serves to connect to the main cover of the stay.

The system contains a large number of parts and causes some diameter changes in the visible part of the stay protruding from the bottom plate. This is not particularly satisfactory for aesthetic reasons. Moreover, coffering pipes must be positioned very precisely, which complicates the construction of concrete decks.

In another embodiment, the fixing block is retained inside the clevis articulated to the structure element. The clevis should have a shape that allows access to the fixing block so that it is possible to fix each strand individually and to install means for protecting the fixing area from corrosion.

In these embodiments, the stationary block is received between the arms of the clevis and the front face is supported against the head of the clevis through which the strands pass. In order to be able to accommodate the fixing block, the space between the arms of the clevis must have a sufficient length and width, so that the clevis has a relatively large dimension and thickness.

It is an object of the present invention to make it simple and convenient to fasten cables to structural elements.

Accordingly, the present invention is a device for fixing a structural cable to a structural element, a fixing block having a means for wedging the component strands of the cable, and articulated with respect to the structural element, a hole through which the cable is coupled through And a clevis having a head in the direction of the cable, wherein the clevis has a shape suitable for holding the fixing block when a tensile load is applied to the cable.

According to the invention, the fixing block is at least partially coupled to a hole passing through the head of the clevis, and the hole is a corresponding screw formed on the circumferential surface of the fixing block and / or the stopping member to hold the fixing block. It has a female screw to accommodate it.

By screwing the fixing block or the stop member to the head of the clevis, it is possible to reduce the dimensions of the clevis, in particular the length and thickness, since it is possible to improve the stress transfer between the cable and the structural element. As a result, more compact parts can be used, in particular, which makes it possible to improve the continuous effect between the cable and the means for connecting the cable to the structure.

In a specific embodiment of the invention, the clevis comprises two arms extending from the head to the opposite tip of the clevis, the arms for articulating relative to the structural element at the opposite tip of the clevis. Perforated by the pin and in a direction orthogonal to the direction of the articulating pin, access from the rear of the fixing block is allowed between the arms of the clevis.

A tube for protecting the cable is connected to the head of the clevis.

A gasket is interposed that provides an elastic connection between the protective tube and the head of the clevis to center the protective tube with respect to the head of the clevis.

The cable consists of a plurality of strands, each strand being protected by an individual cover made of plastic material, the individual cover of each strand being formed in front of the fixing block and in which the strands do not have a cover. Discontinuous in the chamber, which penetrates into the fixing block with a wedge, the chamber is filled with a protective material, and at least a part of the side wall is assembled with a member which is screwed with a female screw formed in the head of the clevis, the member is the clevis In the head of the stopper to form a stop member acting on the fixed block.

The front surface of the chamber is sealed by a stuffing-box type sealing system, the sealing system comprising at least two rigid plates penetrated by the strands and at least one located between the two plates. An elastic pad and clamping means for fixing the pad between the plates.

The clamping means comprise a piston which is supported by an outer plate of the sealing system and connected to a screw that engages a female screw formed on the head of the clevis.

The chamber extends at least partially inside the head of the clevis. The chamber is in communication with another chamber, which is located behind the fixing block and filled with the same protective agent and sealed with a cap.

Other features and advantages of the invention will be apparent from the following detailed description of the embodiments, which are set forth with reference to the accompanying drawings.

Hereinafter, this invention is demonstrated about the case of a cable-stayed bridge. The apparatus according to the invention is applied to the example of fixing the bottom end of the stay to the deck of the bridge, as shown in the accompanying drawings.

It can be seen that similar devices can be used at the top of the stay and more commonly used to secure other types of structural cables used in construction techniques.

The stay shown in FIG. 1 consists of a bundle of strands that are essentially parallel to each other. In the example shown in FIG. 1, each strand is in the form of grease or wax applied to its surface. Each strand consists of one strand, formed from a collection of twisted metal filaments in tension, covered with a protective agent such as grease or wax, and contained within a separate cover made of plastic material such as high density polyethylene (HDPE). do.

The ends of the constituent strands of the cable are wedged in a fixed block 12 supported in clevis 13.

The clevis 13 is shown in FIG. 2. The clevis 13 includes a head 14 through which a screw hole 15 coaxial with the stay passes. The clevis 13 comprises two side walls 16 formed by arms 17 extending from the head 14 at opposite ends.

The clevis 13 has two side walls 16 arranged on either side of the support 18 coupled to the bottom plate. The horizontal articulation pin 19 penetrates the sidewalls 16 and the support 18 of the clevis so that the crevis 13 articulates with respect to the bottom plate.

The fixing block 12 is screwed into the screw hole 15 present in the head 14 of the clevis is coupled to the head (14). The fixing block 12 has a conventional cylindrical shape, and has a screw 21 corresponding to the female screw provided in the head 14 on the circumferential surface. In addition, an optional collar 27 having a corresponding screw 37 is screwed into the screw hole 15 in front of the fixing block 12. The collar 27 serves to fix the fixing block 12 to be held in place. In another embodiment, the fixing block 12 is not formed with a screw, the screw is formed only in the collar 27, the collar 27 has a length sufficient to withstand the tensile load.

Thus, the arms 17 of the clevis 13 do not have to be sufficiently long and spaced to accommodate the entire fixed block so that the fixed block is easily accessible. In addition, the transfer of the stress of the clevis 13 is good, and the structure is simpler than that of the conventional device.

As shown in FIG. 3, the individual cover of each strand 10 is suspended in front of the front of the fixing block 12. The exposed tip of each strand 10 penetrates a hole formed in the fixing block 12 to reach an end in the truncated conical mouse on the back of the fixing block 12. On this back side, a fixed jaw (24) made of truncated cones, corresponding to the shape of the mouse, is positioned around the strands to wed the strands in the fixing block (12).

In order to prevent corrosion of the exposed ends of the strands 10, the chamber 25 is positioned so that the discontinuities of each cover of each strand are located inside the chamber 25 filled with a protective agent such as wax or resin (not shown). Is installed in front of the fixing block 12. The chamber 25 is bounded laterally by, for example, a cylindrical side wall 26 welded to a threaded collar 27.

On the opposite side of the block 12 the chamber 25 is sealed by a packing box sealing system. As shown in this example, the sealing system comprises three rigid plates 28a, 28b and 28c and two elastic pads 29 interposed between the rigid plates 28a, 28b and 28c, Each plate 28a, 28b, 28c is made of, for example, high density polyethylene, and is penetrated by holes positioned to allow the covered strands 10 to pass through. Each elastic pad 29 is made of, for example, foam material and is penetrated by the strands 10 covered with the cover.

Threaded rods 30 extend into the chamber 25 disposed between the stationary block 12 and the sealing system. These rods 30 pass through the plates 28a, 28b and 28c and the pads 29 and are fastened with a nut 31 on the outside of the sealing system and / or fixing block 12.

A gap member 32 is arranged in the chamber 25, for example around the threaded rod 30, to determine the distance between the fixing block 12 and the innermost plate 28a. Tightening the nut 31 at the front and / or back of the sealing system compresses the pad 29 to seal the front of the chamber 25.

One or more channels (not shown) are formed in the fixing block 12 to communicate the chamber 25 with another chamber 34 located at the rear surface of the fixing block. The chamber 34 is bounded by a cap 35 that seals and covers the back of the fixing block 12. As shown in the figure, the cap 35 may be fastened with a bolt to the fixing block 12 or screwed into the screw hole 15 of the clevis. The cap 35 has an inlet 36 for injecting a protective wax. After injecting the wax, the wax fills the chamber 34 and the chambers in which the respective covers of the strands 10 are discontinuous so as to protect the exposed block of the fixing block 12 and the respective covers of the strands from corrosion. A gap is formed in 25).

The strands 10 are screwed into a fixing block 12 previously screwed into the head of the clevis, and the jaws 24 for wedge coupling, the threaded rod 30 and the cap 35 are installed, and wax In order to inject, it is necessary to access between the arms 17 of the clevis from the rear of the fixing block 12. Thus, as shown in FIG. 1, some space remains available behind the block 12 and the cap 35. However, the effect of the space on the dimensions of the clevis is reduced. The reason is that the stationary block is located where the stationary block is screwed and the arms 17 of the clevis traverse, ie inside the head of the clevis, as a result, transverse to the direction of the articulation pin. This is because it allows access from the rear of the fixing block to squeeze.

In addition, the fixing device may omit the guide tube and the deflector used in the conventional stabilization device. Any movement of the stay is allowed as the clevis articulates with respect to the deck. The chamber 25 and the sealing system can be extended to allow the strands to branch towards the stationary block 12, resulting in a convenient overall design of the stationary device, in particular the chamber 25 having a screw hole in the clevis head. It is convenient in that it can extend at least partially into (15).

After installing the clevis 13, the fixed block 12, the strand 10, and the jaws of the strand 24, the sealing system and the cap 35, and after injecting wax, The protective tube 40 is located at the part of the stay which is out of the chamber 25. As shown in FIGS. 1 and 3, the tube 40 may be continuously connected to the clevis head 14 via a sealing gasket 41 between the clevis head 14 and the clevis head 14. The tube 40 continuously provides a cover comprising strand bundles in the extending portion of the stay. The tube may include a drain passage (not shown). The tube also serves to protect the base of the stay from traffic accidents or deliberate breakage. When the gasket 41 has an annular shape of tubular cross-sectional area as shown, the tube makes an elastic joint movement centered automatically between the cover of the clevis and the stay.

4 shows a piston 44 whose clamping means used for pressing the pad 29 between the rigid plates of a sealing system is delimited by an inner annular rim of a member 45 having a conventional cylindrical shape. Shows another embodiment comprising a.

The member 45 has an outer thread 46 coupled to the female thread 15 formed on the head 14 of the clevis at the front end of the fixing block 12. Thus, when the member 45 is screwed into the clevis, the outer plate 28c of the sealing system is pressed, and the outer plate 28c is supported by one or more gap members located in the chamber 25. The pads 29 are pressed to seal the pads. In particular, it becomes possible to provide a cylindrical gap material located between the strand bundle and the member 45.

In addition, the member 45 or the gap member serves to delimit the chamber 25 containing the protective wax to the side. On the opposite side of the fixing member, the member 45 ends with an outer screw 47 to be connected to an extending portion of the outer cover of the stay. Thus, it becomes possible to omit the additional protective tube 40 shown in FIG.

According to the present invention, by screwing the fixed block or the stop member to the head of the clevis, it is possible to reduce the stress, particularly the length and thickness of the clevis, because it can improve the stress transfer between the cable and the structural element, As a result, in particular more compact parts can be used, which makes it possible to make the continuous effect between the cable and the means for connecting the cable to the structure better.

Claims (10)

An apparatus for securing a structural cable to a structural element, comprising: a fixing block (12) having means (24) for wedging the strands (10) constituting the cable, and articulating with respect to the structural element, the cable And a clevis 13 having a head 14 through which the joining hole 15 penetrates in the direction of the cable, and the clevis supports the fixing block when a tension load is applied to the cable. In the fixing device of a structural cable having a suitable shape, The fixing block is at least partially coupled to the hole 15 penetrating through the head 14 of the clevis, the hole corresponding to the circumferential surface of the fixing block and / or the stopping member to support the fixing block. Apparatus for securing a structural cable to a structural element, characterized in that it has a female thread for receiving screws (21, 37). 2. The clevis (13) according to claim 1, wherein the clevis (13) comprises two arms (17) extending from the head (14) to the opposite tip of the clevis, wherein the arms (17) are opposite ends of the clevis. A pin 19 for articulating with respect to the structural element is passed through, and behind the fixing block 12, access in a direction orthogonal to the direction of the pin 19 is between the arms of the clevis. Apparatus for securing a structural cable to a structural element, characterized in that Device according to claim 1 or 2, characterized in that a tube (40) for protecting the cable is connected to the head of the clevis (14). 4. A gasket (41) according to claim 3, wherein a gasket (41) providing an elastic connection is provided between the protective tube (40) and the clevis head (14) to center the protective tube (40) with respect to the head of the clevis. Apparatus for securing a structural cable to an element of a structure, characterized in that it is interposed. The cable according to any one of the preceding claims, wherein the cable consists of a plurality of strands (10), each strand (10) being protected by an individual cover made of plastic material. Discontinuous in the chamber 25, formed in front of the fixing block 12 and penetrated to be fixed to the fixing block in the portion without the cover, the chamber 25 is filled with a protective material, the interior At least part of the side wall is assembled with a member (27) screwed with a female screw (15) formed in the head (14) of the clevis. 6. A device according to claim 5, characterized in that the member (27) forms a stop member which acts on the fixing block (12). 7. The at least two rigid plates (28a) according to claim 5 or 6, wherein the front surface of the chamber (25) is sealed by a packing box type sealing system, and the sealing system is penetrated by the strands (10). And 28b, 28c, at least one elastic pad 29 positioned between the two plates and clamping means 30, 31, 32 for securing the pads between the plates. Device for securing cables to structural elements. The piston according to claim 7, wherein the clamping means is connected to a screw (46) which bears the outer plate (28c) of the sealing system and engages a female thread (15) formed in the head (14) of the clevis. Apparatus for securing a structural cable to a structural element, comprising (44). 9. The device according to claim 5, wherein the chamber extends at least partially inside the head of the clevis. 10. 10. The method according to any one of claims 5-9, wherein the chamber (25) is in communication with another chamber (34) located behind the fixing block (12). Device for.

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