CN210066489U - Inhaul cable sheath structure - Google Patents
Inhaul cable sheath structure Download PDFInfo
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- CN210066489U CN210066489U CN201920755288.1U CN201920755288U CN210066489U CN 210066489 U CN210066489 U CN 210066489U CN 201920755288 U CN201920755288 U CN 201920755288U CN 210066489 U CN210066489 U CN 210066489U
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Abstract
The utility model discloses a cable sheath structure, the cover is put outside the steel wire bundle, include: 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. Adopt above-mentioned cable sheath structure, can alleviate and prevent even that netted crackle and annular crack from appearing in the polyethylene sheath, guarantee the sheath to the long-time protective effect of steel strand.
Description
Technical Field
The utility model relates to a protection technical field of cable, concretely relates to cable sheath structure.
Background
On fixed buildings such as bridges, often can utilize the cable to carry out tractive and bearing, in order to guarantee the safety of cable use and prolong its life, the cable that uses now wraps up multilayer protective structure outside the high strength steel wire bundle of core part usually, thereby form the sheath that protects the steel wire bundle, current sheath structure, the polyester fiber area that sets gradually usually from inside to outside, inlayer polyethylene sheath and outer polyethylene sheath, the polyester fiber area has high intensity, can bear the pulling force, inside, outer polyethylene sheath are made by high density polyethylene plastics, for the convenience of distinguishing, the inlayer sets up to black usually, the skin sets up to the colour, and set up the helix that has anti-wind rain vibration ability outside outer polyethylene sheath, increase the resistance of cable under the complex environment.
Only, adopt the cable of above-mentioned sheath structure, under the illumination effect of sunshine, because the sunny side that sunshine penetrates directly is higher than the cloudy side temperature that can not accept the sunshine and shine, great temperature difference can make the polyethylene sheath produce great temperature stress, causes the polyethylene sheath to produce netted crackle easily. Meanwhile, the stay cable can bear large axial tension in the installation and operation processes and generate certain axial deformation, so that the polyethylene sheath is easy to generate annular cracks. Whether the crack is a net crack or an annular crack, the protection effect of the sheath on the steel wire bundle can be reduced, and the use safety and the service life of the inhaul cable are shortened.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a cable sheath structure to alleviate or prevent that netted crackle and annular crack from appearing in the polyethylene sheath, guarantee the sheath to the long-time protecting effect of steel wire bundle.
In order to achieve the above technical effects, the utility model discloses a technical scheme is:
a stay cable sheath structure is sleeved outside a steel wire bundle and comprises: 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.
Further, above-mentioned cable sheath structure still includes: 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.
Further, the metal heat conduction ring includes: the aluminum alloy semi-ring and the magnesium alloy semi-ring are in butt joint end to end.
Further, the size of the metal heat conduction ring along the radial direction of the inhaul cable is gradually increased from the arc top of the aluminum alloy semi-ring to the arc top of the magnesium alloy semi-ring.
Further, the dimension of the metal heat conduction rings in the axial direction of the cable is not more than 1/2 of the diameter of the cable, and the distance between every two adjacent metal heat conduction rings is not less than 1/3 of the diameter of the cable.
Furthermore, a male surface mark is arranged at the position, corresponding to the arc-shaped top of the aluminum alloy semi-ring, of the outer surface of the heat insulation material layer, and/or a female surface mark is arranged at the position, corresponding to the arc-shaped top of the magnesium alloy semi-ring, of the outer surface of the heat insulation material layer.
The utility model discloses following beneficial effect has:
by adding the heat insulation material outside the outer polyethylene sheath, the heat insulation property of the heat insulation material is utilized, ultraviolet rays can be prevented at the same time, and heating of the inner polyethylene sheath is reduced, so that the problem that the temperature of the sun surface and the temperature of the shade surface of the polyethylene sheath are uneven under the irradiation of sunlight is effectively relieved, the temperature stress generated by the polyethylene sheath is reduced, and the reticular cracks of the polyethylene sheath are relieved or prevented; meanwhile, the steel wire meshes are arranged between the inner polyethylene sheath and the outer polyethylene sheath, the axial deformation resistance of the sheaths is improved, the axial deformation degree of the inhaul cables is reduced when the inhaul cables are stressed, and therefore annular cracking of the polyethylene sheaths is relieved or prevented, and the long-time protection effect of the sheaths on the steel wire bundles is finally guaranteed.
Drawings
Fig. 1 is a schematic view of a radial cross-section structure of a first embodiment of the present invention;
fig. 2 is a schematic view of a radial surface structure of a second embodiment of the present invention;
fig. 3 is a schematic axial half-section structure diagram of a second embodiment of the present invention;
FIG. 4 is a schematic structural view of a second metal heat-conducting ring according to an embodiment of the present invention;
reference numerals:
1-a steel wire bundle, and the steel wire bundle,
2-a polyester fiber tape, which is composed of a polyester fiber,
3-an inner layer of polyethylene sheath,
4-a steel wire mesh is arranged on the steel wire mesh,
5-an outer layer of a polyethylene sheath,
6-a layer of a thermally insulating material,
7-wind, rain and vibration resistant spiral line,
8-metal heat conduction ring, 81-aluminum alloy semi-ring, 82-magnesium alloy semi-ring,
91-male side mark, 92-female side mark.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced components or structures must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be considered as limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1, the main structural form of the cable sheath structure provided by this embodiment is similar to that of an existing cable, and on the basis of the existing cable, a steel wire mesh 4 is disposed between an inner polyethylene sheath 3 and an outer polyethylene sheath 5, and a thermal insulation material layer 6 is added outside the outer polyethylene sheath 5, so as to form a structure in which a polyester fiber band 2, an inner polyethylene sheath 3, a steel wire mesh 4, an outer polyethylene sheath 5 and a thermal insulation material layer 6 are sequentially sleeved outside a steel wire bundle 1 from inside to outside in layers, and a wind and rain vibration resistant spiral line 7 is also disposed outside the thermal insulation material layer 6, so as to increase the resistance of the cable in a complex environment.
The heat insulation material layer 6 arranged on the outer layer can adopt heat insulation materials such as glass fiber, asbestos, rock wool, aerogel felt and the like commonly used in the prior heat insulation technology, has mature technology and can be directly obtained and manufactured. Utilize the thermal-insulated characteristic that thermal insulation material itself has to ultraviolet protection simultaneously, after setting up thermal-insulated material layer 6, can reduce being heated of inside polyethylene sheath (including inlayer polyethylene sheath 3 and outer polyethylene sheath 5), thereby effectively slow down the polyethylene sheath and appear the inhomogeneous problem of positive and negative temperature under sunshine shines, reach the temperature stress that reduces the polyethylene sheath and produce, in order to alleviate or prevent that the polyethylene sheath from appearing netted crackle. Meanwhile, the steel wire mesh 4 is clamped between the inner polyethylene sheath 3 and the outer polyethylene sheath 5, the axial deformation resistance of the whole sheath can be improved, the axial deformation degree of the inhaul cable under stress is reduced, and particularly, the axial deformation resistance of the inner polyethylene sheath 3 and the outer polyethylene sheath 5 which are tightly attached to the inner side and the outer side of the steel wire mesh 4 is stronger, so that annular cracking of the polyethylene sheaths is relieved or prevented. Under the dual action of the thermal insulation material layer 6 and the steel wire mesh 4, the reticular cracks and the annular cracks of the inner polyethylene sheath 3 and the outer polyethylene sheath 5 can be effectively reduced or even prevented from occurring from the source, and the long-time protection effect of the sheaths on the steel wire bundles 1 is finally ensured.
Example two:
as shown in fig. 2 to 4, on the basis of the structure of the embodiment, the embodiment further includes a metal heat conduction ring 8 between the outer polyethylene sheath 5 and the heat insulation material layer 6, and by using the characteristic that the heat conduction performance of metal is stronger than that of the polyethylene material and the heat insulation material in the scheme, when the sunlight irradiation intensity is too large and heat enters the sheath through the heat insulation material layer 6, the higher temperature of the male surface is quickly transferred to the female surface through the metal heat conduction ring 8 after contacting the metal heat conduction ring 8, so as to reduce the temperature difference between the male surface and the female surface, and realize the temperature balance between the male surface and the female surface, so that the temperature stress generated inside the polyethylene sheath can be effectively reduced under the abnormal high temperature environment such as the high temperature red warning, and the like, so as to reduce or prevent the polyethylene sheath from generating the reticular crack.
Meanwhile, the metal heat conduction rings 8 are uniformly arranged at intervals along the axial direction of the stay cable so as to ensure that the stay cable keeps the existing bending and twisting capacity. In this embodiment, the specific specifications of the metal heat conduction ring 8 are set as follows: the dimension along the axial direction of the stay cable is not more than 1/2 of the diameter of the stay cable, the distance between two adjacent metal heat conduction rings 8 is not less than 1/3 of the diameter of the stay cable, and the metal heat conduction rings 8 can not cause interference and influence on the steel wire bundle 1 in the inherent deformation range no matter the steel wire bundle is bent or twisted.
As shown in fig. 4, the specific structure of the metal heat conduction ring 8 in this embodiment includes: the aluminum alloy semi-ring 81 and the magnesium alloy semi-ring 82 which are butted end to end surround to form a ring, the density of the magnesium alloy and the aluminum alloy is very low, and further the mass of the metal heat conducting ring 8 is very light, so that the self weight of the inhaul cable cannot be excessively increased. Meanwhile, because the specific heat capacity of the magnesium alloy is about three times that of the aluminum alloy, the heat absorbed by the magnesium alloy is about three times that of the aluminum alloy when the temperature is raised to the same temperature, but the heat conductivity of the magnesium alloy is only half that of the aluminum alloy, for example, the heat conductivity of the magnesium alloy is 51W/mk by using AZ91D, the heat conductivity of the aluminum alloy is 96W/mk by using A380, and the heat conductivity of the aluminum alloy is 96.2W/mk, so that the conduction speed of the heat on the two alloys is nearly twice as fast as that of the A380 (aluminum alloy) compared with AZ 91D. Therefore, when one side of the aluminum alloy half ring 81 faces the outside, the high temperature of the contacting outside can be quickly transmitted to the magnesium alloy half ring 82 and be absorbed by the magnesium alloy half ring 82 in a large amount, and finally, the balance of the temperatures of the inside and the outside can be quickly realized.
Since the metal heat conductive ring 8 is covered and hidden in the heat insulating material layer 6, and cannot be visually perceived from the outside, as shown in fig. 2 and 3, a male surface mark 91 may be provided at a position on the outer surface of the heat insulating material layer 6 corresponding to the arc-shaped top portion of the aluminum alloy half ring 81, or a female surface mark 92 may be provided at a position on the outer surface of the heat insulating material layer 6 corresponding to the arc-shaped top portion of the magnesium alloy half ring 82. In this embodiment, it is more convenient to set and observe the male mark 91 and the female mark 92 at the same time.
In addition, referring to fig. 4, in this embodiment, the size of the metal heat conduction ring 8 in the radial direction of the cable is set to be gradually increased from the arc top of the aluminum alloy half ring 81 to the arc top of the magnesium alloy half ring 82, so as to more fully utilize the large specific heat capacity of the magnesium alloy, and concentrate more heat to one side of the female surface where the magnesium alloy half ring 82 is located under the condition of ensuring uniform heat transfer, thereby making the heating of the female surface and the male surface more uniform.
Through the scheme, the temperature stress generated by the polyethylene sheath can be better reduced, and the polyethylene sheath is prevented from generating reticular cracks.
To sum up, the utility model provides a cable sheath structure can alleviate and prevent even that netted crackle and annular crack from appearing in the polyethylene sheath, guarantees the sheath and to the long-time protecting effect of steel wire bundle.
It should be noted that the above preferred embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920755288.1U CN210066489U (en) | 2019-05-24 | 2019-05-24 | Inhaul cable sheath structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920755288.1U CN210066489U (en) | 2019-05-24 | 2019-05-24 | Inhaul cable sheath structure |
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| Publication Number | Publication Date |
|---|---|
| CN210066489U true CN210066489U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920755288.1U Active CN210066489U (en) | 2019-05-24 | 2019-05-24 | Inhaul cable sheath structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111364360A (en) * | 2020-03-31 | 2020-07-03 | 广州珠江黄埔大桥建设有限公司 | Bridge stay cable heat insulation and fire resistance graded protection structure and construction method thereof |
-
2019
- 2019-05-24 CN CN201920755288.1U patent/CN210066489U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111364360A (en) * | 2020-03-31 | 2020-07-03 | 广州珠江黄埔大桥建设有限公司 | Bridge stay cable heat insulation and fire resistance graded protection structure and construction method thereof |
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