CN210066489U - A cable sheath structure - Google Patents

Abstract

The utility model discloses a cable sheath structure, which is sheathed outside a steel wire bundle, comprising: polyester fiber tapes, an inner layer polyethylene sheath, a steel wire mesh, an outer layer poly A vinyl jacket and a layer of heat insulating material, and an anti-wind, rain and vibration helix is arranged outside the heat insulating material layer. The above-mentioned cable sheath structure can reduce or even prevent the occurrence of mesh cracks and annular cracks in the polyethylene sheath, and ensure the protective effect of the sheath on the wire bundles for a long time.

Description

A cable sheath structure

technical field

The utility model relates to the technical field of cable protection, in particular to a cable sheath structure.

Background technique

On fixed buildings such as bridges, cables are often used for pulling and bearing load. In order to ensure the safety of the cables and prolong their service life, the cables currently used are usually wrapped in high-strength steel wire bundles in the core part. The existing sheath structure is usually a polyester fiber tape, an inner layer of polyethylene sheath and an outer layer of polyethylene sheath which are sequentially sheathed from the inside to the outside. The sleeve, the polyester fiber belt has extremely high strength and can withstand the tensile force, the inner and outer polyethylene sheaths are made of high-density polyethylene plastic, for easy distinction, the inner layer is usually set to black, and the outer layer is set to Colored, and a helix with anti-wind, rain and vibration is set outside the outer polyethylene sheath to increase the resistance of the cable in complex environments.

However, for the cable with the above-mentioned sheath structure, under the action of sunlight, the temperature of the positive surface exposed to direct sunlight is higher than that of the negative surface that cannot receive sunlight, and the larger temperature difference will cause the polyethylene sheath to generate a larger temperature. Stress can easily cause mesh cracks in the polyethylene sheath. At the same time, the cable will bear a large axial tension during installation and operation, and produce a certain axial deformation, which will easily cause annular cracks in the polyethylene sheath. Whether it is a mesh crack or an annular crack, the protective effect of the sheath on the wire bundle will be reduced, and the safety and life of the cable will be shortened.

Utility model content

In view of the above problems, the utility model proposes a cable sheath structure to reduce or prevent the occurrence of mesh cracks and annular cracks in the polyethylene sheath and ensure the long-term protection effect of the sheath on the steel wire bundle.

In order to achieve the above-mentioned technical effect, the technical scheme adopted by the present utility model is:

A cable sheath structure is sheathed outside a steel wire bundle, comprising: polyester fiber tapes, an inner polyethylene sheath, a steel mesh, an outer polyethylene sheath and a spacer which are layered and sheathed from the inside to the outside. The thermal material layer is provided with an anti-wind, rain and vibration helix outside the thermal insulation material layer.

Further, the above-mentioned cable sheath structure further includes: a metal heat-conducting ring, the metal heat-conducting ring is arranged between the outer polyethylene sheath and the insulating material layer, and is evenly spaced along the axial direction of the cable.

Further, the metal heat conducting ring includes: an aluminum alloy half ring and a magnesium alloy half ring that are butted end to end.

Further, the size of the metal heat-conducting ring along the radial direction of the cable gradually increases from the arc-shaped top of the aluminum alloy half-ring to the arc-shaped top of the magnesium alloy half-ring.

Further, the dimension of the metal heat-conducting ring along the axial direction of the cable is not greater than 1/2 of the diameter of the cable, and the distance between two adjacent metal heat-conducting rings is not less than 1/3 of the diameter of the cable.

Further, the position corresponding to the arc top of the aluminum alloy half ring on the outer surface of the heat insulating material layer is provided with a positive surface mark, and/or, the arc on the outer surface of the heat insulating material layer and the magnesium alloy half ring arc The position corresponding to the top of the shape is provided with a negative mark.

The utility model has the following beneficial effects:

By adding thermal insulation material outside the outer polyethylene sheath, the thermal insulation properties of the thermal insulation material itself can be utilized, and at the same time, ultraviolet rays can be prevented, and the heating of the inner polyethylene sheath can be reduced, thereby effectively reducing the exposure of the polyethylene sheath to sunlight. The problem of uneven temperature between the positive and negative surfaces can reduce the temperature stress generated by the polyethylene sheath to reduce or prevent mesh cracks in the polyethylene sheath. , Improve the ability of the sheath to resist axial deformation, reduce the degree of axial deformation when the cable is stressed, so as to alleviate or prevent the annular cracking of the polyethylene sheath, and finally ensure the long-term protective effect of the sheath on the wire bundle.

Description of drawings

1 is a schematic view of the radial cross-sectional structure of Embodiment 1 of the present utility model;

2 is a schematic view of the radial surface structure of Embodiment 2 of the present utility model;

3 is a schematic diagram of an axial half-section structure of Embodiment 2 of the present utility model;

4 is a schematic structural diagram of a second embodiment of the present utility model metal heat conduction ring;

Reference number:

1 - Wire bundle,

2- Polyester tape,

3- inner polyethylene sheath,

4- Wire mesh,

5-outer polyethylene sheath,

6- Thermal insulation material layer,

7- Anti-wind and rain vibration helix,

8-metal heat conduction ring, 81-aluminum alloy half-ring, 82-magnesium alloy half-ring,

91 - positive marking, 92 - negative marking.

Detailed ways

The embodiments of the technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention. In the description of the present utility model application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the accompanying drawings The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or structures referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a Utility Model Restrictions.

Example 1:

As shown in FIG. 1 , the cable sheath structure provided in this embodiment has the same main structural form as the existing cable, and on the basis of the existing cable, the inner layer of polyethylene sheath 3 and the outer layer of polyethylene A steel mesh 4 is arranged between the sheaths 5, and a thermal insulation material layer 6 is added outside the outer polyethylene sheath 5, so as to form a layered sheath of polyester fiber tapes 2 and an inner poly The structure of the vinyl sheath 3, the steel mesh 4, the outer polyethylene sheath 5 and the thermal insulation material layer 6, the wind and rain vibration resistance helix 7 is also set outside the thermal insulation material layer 6 to increase the resistance of the cable in complex environments. sex.

The thermal insulation material layer 6 provided on the outer layer can be made of glass fiber, asbestos, rock wool, aerogel felt and other thermal insulation materials commonly used in the existing thermal insulation technology. The technology is mature and can be directly obtained and manufactured. Utilizing the heat insulating properties of the heat insulating material itself, and at the same time preventing ultraviolet rays, the inner polyethylene sheath (including the inner polyethylene sheath 3 and the outer polyethylene sheath 5) can be lowered after the insulating material layer 6 is provided. Therefore, the problem of uneven temperature between the positive and negative surfaces of the polyethylene sheath under sunlight can be effectively alleviated, and the temperature stress generated by the polyethylene sheath can be reduced to reduce or prevent mesh cracks in the polyethylene sheath. At the same time, a layer of steel mesh 4 sandwiched between the inner polyethylene sheath 3 and the outer polyethylene sheath 5 can improve the ability of the entire sheath to resist axial deformation and reduce the axial deformation of the cable when it is stressed. The degree of deformation, especially for the inner layer polyethylene sheath 3 and the outer layer polyethylene sheath 5 set close to the inner and outer layers of the steel mesh 4, the ability to resist axial deformation is stronger, thereby alleviating or preventing the polyethylene sheath from appearing ring-shaped cracked. Under the dual action of the heat insulating material layer 6 and the steel mesh 4, the mesh cracks and annular cracks in the inner polyethylene sheath 3 and the outer polyethylene sheath 5 can be effectively alleviated or even prevented from the source, and finally ensure the The protective effect of the sheath on the wire bundle 1 for a long time.

Embodiment 2:

As shown in FIGS. 2 to 4 , on the basis of the structure of the first embodiment, in this embodiment, a metal heat-conducting ring 8 is further arranged between the outer polyethylene sheath 5 and the heat-insulating material layer 6 to utilize the heat-conducting performance of the metal. Stronger than the characteristics of the polyethylene material and the heat insulating material in this scheme, when the intensity of sunlight is too large, and the heat enters the interior of the sheath through the heat insulating material layer 6, the higher temperature of the positive surface contacts the metal heat conduction ring 8 after the , it will be quickly transmitted to the negative side through the metal heat-conducting ring 8, thereby reducing the temperature difference between the positive side and the negative side, and realizing the temperature balance between the positive side and the negative side, so that in the abnormal high temperature environment such as high temperature red warning, it can also effectively reduce the polyethylene protection. Thermal stress generated inside the jacket to reduce or prevent mesh cracks in the polyethylene jacket.

At the same time, the metal heat-conducting rings 8 should be evenly spaced along the axial direction of the cable to ensure that the cable maintains the existing bending and torsion capabilities. In this embodiment, the specific specifications of the metal heat-conducting ring 8 are set as follows: the dimension along the axial direction of the cable is not greater than 1/2 of the diameter of the cable, and the distance between two adjacent metal heat-conducting rings 8 is not less than the diameter of the cable It is guaranteed that within the inherent deformation range of the steel wire bundle 1, the metal heat conducting ring 8 will not interfere or affect it whether it is bent or twisted.

As shown in FIG. 4 , the specific structure of the metal heat-conducting ring 8 in this embodiment includes: an aluminum alloy half ring 81 and a magnesium alloy half ring 82 that are butted end-to-end. It is very low, and the metal heat conducting ring 8 is very light in weight, and will not increase the weight of the cable too much. At the same time, because the specific heat capacity of magnesium alloy is about three times that of aluminum alloy, the heat absorbed by magnesium alloy is about three times that of aluminum alloy when the temperature rises, but the thermal conductivity of magnesium alloy is only half of that of aluminum alloy. For example, AZ91D is used for magnesium alloy. The thermal conductivity is 51W/mk, and the aluminum alloy is A380, and its thermal conductivity is 96.2W/mk, so the heat conduction speed on the two alloys, A380 (aluminum alloy) will be nearly twice as fast as AZ91D (magnesium alloy). Therefore, when one side of the aluminum alloy half ring 81 faces the positive side, the high temperature of the positive side that it contacts will be quickly transferred to the magnesium alloy half ring 82 and absorbed in a large amount by the magnesium alloy half ring 82, and finally, the temperature of both sides of the yin and yang sides can be quickly balanced. .

Because the metal heat conduction ring 8 is covered and hidden in the heat insulating material layer 6, it cannot be felt intuitively from the outside. Therefore, as shown in Fig. 2 and Fig. The position corresponding to the arc-shaped top of 81 is provided with a positive surface mark 91 , or a position corresponding to the arc-shaped top of the magnesium alloy half ring 82 on the outer surface of the heat insulating material layer 6 is provided with a negative surface mark 92 . In this embodiment, it is more convenient to set the positive side mark 91 and the negative side mark 92 at the same time for observation.

4 , in this embodiment, the size of the metal heat-conducting ring 8 in the radial direction of the cable is set to gradually increase from the arc-shaped top of the aluminum alloy half-ring 81 to the arc-shaped top of the magnesium alloy half-ring 82 , in order to make full use of the large specific heat capacity of the magnesium alloy, and under the condition of ensuring uniform heat transfer, more heat is concentrated to the side of the negative side where the magnesium alloy half-ring 82 is located, so that the heating on both sides is more uniform.

Through the above solution, the temperature stress generated by the polyethylene sheath can be better reduced, and mesh cracks in the polyethylene sheath can be prevented.

To sum up, the cable sheath structure provided by the utility model can reduce or even prevent the occurrence of mesh cracks and annular cracks in the polyethylene sheath, and ensure the protective effect of the sheath on the wire bundles for a long time.

It should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention , which shall be included in the scope of the claims and description of the present invention.

Claims (6)

1. The utility model provides a cable sheath structure, the cover is put outside the steel wire bundle, its characterized in that includes: the heat insulation material comprises a polyester fiber belt, an inner polyethylene sheath, a steel wire mesh, an outer polyethylene sheath and a heat insulation material layer which are sequentially sleeved in a layered mode from inside to outside, wherein an anti-wind-rain-vibration spiral line is arranged outside the heat insulation material layer.

2. A cable sheath structure according to claim 1, characterized by further comprising: and the metal heat conduction rings are arranged between the outer polyethylene sheath and the heat insulation material layer and are uniformly arranged at intervals along the axial direction of the inhaul cable.

3. The cable sheathing structure according to claim 2, wherein the metal heat-conductive ring comprises: the aluminum alloy semi-ring and the magnesium alloy semi-ring are in butt joint end to end.

4. The cable sheathing structure according to claim 3, wherein the metal heat-conducting ring has a size that gradually increases from the arc-shaped top of the aluminum alloy half ring to the arc-shaped top of the magnesium alloy half ring in the radial direction of the cable.

5. A cable sheathing structure according to any one of claims 2 to 4, wherein the dimension of said metal heat-conducting rings in the axial direction of the cable is not greater than 1/2 of the diameter of the cable, and the spacing between two adjacent metal heat-conducting rings is not less than 1/3 of the diameter of the cable.

6. A cable sheath structure according to claim 3 or 4, wherein a position of the outer surface of the heat insulating material layer corresponding to the arc-shaped top of the aluminum alloy half ring is provided with a male mark, and/or a position of the outer surface of the heat insulating material layer corresponding to the arc-shaped top of the magnesium alloy half ring is provided with a female mark.

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