Automatic temperature expansion compensation device for stay cable sheath
By designing a combination of multi-layer HDPE sheath structure and desiccant in the cable-stayed cable sheath, the problems of sheath cracking and moisture corrosion caused by temperature changes are solved, and better sealing effect and stability and safety of temperature automatic expansion and compensation are achieved.
Patent Information
- Application Number
- CN202421664537.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The temperature automatic expansion and compensation device of existing cable-stayed cable sheath is prone to cracking of HDPE sheath under the action of temperature thermal expansion and contraction, and cannot effectively prevent moisture from entering, resulting in corrosion of steel cable-stayed cables.
A structure including a first HDPE sheath, a second HDPE sheath and a third HDPE sheath are designed, and the temperature automatic expansion compensation is achieved through the cooperation of the sealing ring and the desiccant, and moisture is prevented from entering.
Effectively prevent the HDPE sheath from cracking when the temperature changes, absorbing moisture through the desiccant, preventing corrosion of steel cables, and improving the stability, reliability and safety of sealing effect and automatic temperature expansion compensation.
Smart Images
Figure CN222834735U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of inclined cables, in particular to an automatic temperature expansion and contraction compensation device for an inclined cable sheath. Background Art
[0002] It is particularly important to prevent the cable of a cable-stayed bridge from rainwater erosion for its service life. In the prior art, a HDPE sheath is generally provided on the outer surface of a steel cable such as a steel strand. Since the thermal expansion coefficient of the HDPE sheath is several times, for example, about ten times, that of the steel cable, an automatic temperature expansion compensation device is generally provided on the HDPE sheath.
[0003] However, the temperature automatic expansion and contraction compensation device of the prior art cable-stayed cable sheath still has the following deficiencies: the HDPE sheath sometimes cracks during the repeated linear movement due to thermal expansion and contraction, and a small amount of moisture still enters the HDPE sheath and corrodes the steel cable-stayed cable. That is, the sealing effect and the stability, reliability and safety of the temperature automatic expansion and contraction compensation device still have much room for improvement. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a temperature automatic expansion and contraction compensation device for the sheath of the steel cable which can prevent the HDPE sheath from being torn during repeated linear movement due to thermal expansion and contraction, and can also prevent a small amount of moisture from corroding the sheath of the steel cable.
[0005] The technical solution of the utility model is to provide a temperature automatic expansion and contraction compensation device for an inclined cable sheath, comprising a first HDPE sheath and a second HDPE sheath sleeved on the inclined cable, wherein an axial distance is left between the first HDPE sheath and the second HDPE sheath; a section of a third HDPE sheath is sleeved on the second HDPE sheath, and a sealing ring is provided between the second HDPE sheath and the third HDPE sheath; a fourth HDPE sheath is sleeved on the axially adjacent sections of the first HDPE sheath and the third HDPE sheath, and a convex ring and a concave ring for mutual axial limitation are provided between the fourth HDPE sheath and the first HDPE sheath and the third HDPE sheath; and a desiccant for absorbing moisture is provided axially between the first HDPE sheath and the third HDPE sheath in the fourth HDPE sheath.
[0006] After adopting the above structure, the temperature automatic expansion and contraction compensation device of the inclined cable sheath of the utility model has the following advantages:
[0007] When the temperature changes, the first HDPE sheath stretches or shortens, and the third HDPE sheath is driven by the fourth HDPE sheath to slide along the outer surface of the second HDPE sheath. Therefore, the first HDPE sheath will not produce large temperature stress. At the same time, the rubber sealing ring can effectively isolate the air with water vapor and prevent moisture from entering the HDPE sheath. Even if a small amount of air with water vapor enters the space of the fourth HDPE sheath, it will be effectively absorbed by the desiccant.
[0008] The temperature automatic expansion and contraction compensation device of the cable sheath of the utility model can effectively prevent the HDPE sheath from being torn during the repeated linear movement process of the thermal expansion and contraction, and can also prevent the small amount of moisture that has entered the HDPE sheath from corroding the steel cable. The sealing effect is good, and the stability, reliability and safety of the temperature automatic expansion and contraction compensation are good. The device can allow the HDPE sheath of the cable to deform freely under the action of temperature without generating large temperature stress, and can effectively maintain the dryness of the air in the HDPE sheath, ensuring that the steel cable is not corroded by humid air.
[0009] Furthermore, the fourth HDPE sheath is two semicircular HDPE sheaths, and the two semicircular HDPE sheaths are fixed by multiple screws. After adopting the above structure, the fourth HDPE sheath can be regularly disassembled and the desiccant can be replaced, such as replacing the silica gel desiccant, which further ensures the technical effect of effectively maintaining the dryness of the air in the HDPE sheath and ensuring that the steel cable is not corroded by humid air.
[0010] Furthermore, two sealing gaskets are provided on the two semicircular HDPE jacket connection surfaces. With the above structure, it is convenient to replace the desiccant regularly and ensure the tight sealing performance under normal use.
[0011] Furthermore, the inner wall of the fourth HDPE sheath is provided with two concave circles, the outer wall of the first HDPE sheath is provided with a convex circle matching the concave circle, and the outer wall of the third HDPE sheath is also provided with a convex circle matching the concave circle, both ends of each concave circle are transition slopes, and both ends of each convex circle are transition slopes matching the transition slopes of the concave circle. With the above structure, its manufacture and assembly are more convenient, and the good sealing effect, stability, reliability and safety of automatic temperature expansion compensation are further ensured.
[0012] Furthermore, a sealing gasket is provided on the connection surface of each convex ring and concave ring. After adopting the above structure, its sealing performance is better, and the technical effect of further ensuring that the steel inclined cable is not corroded by humid air is achieved.
[0013] Furthermore, the first HDPE sheath is a stepped sheath, the axially close to the third HDPE sheath section is a large diameter sheath, and the axially far away from the third HDPE sheath section is a small diameter sheath; the third HDPE sheath is also a stepped sheath, the axially close to the first HDPE sheath section is a large diameter sheath, and the axially far away from the first HDPE sheath section is a small diameter sheath; the outer diameters of the large diameter sheath of the first HDPE sheath and the large diameter sheath of the third HDPE sheath are equal. After adopting the above structure, its production and assembly are more convenient, its sealing effect is better, and the stability, reliability and safety of the automatic temperature expansion compensation are better, which further ensures the technical effect of effectively maintaining the dryness of the air in the HDPE sheath and ensuring that the steel inclined cable is not corroded by humid air.
[0014] Furthermore, the transition section between the large diameter sleeve and the small diameter sleeve of the first HDPE sleeve is an oblique sleeve; the transition section between the large diameter sleeve and the small diameter sleeve of the third HDPE sleeve is also an oblique sleeve. With the above structure, it is more convenient to manufacture, the strength of the transition section is better, the sealing effect is better, and the stability, reliability and safety of the temperature automatic expansion and contraction compensation are better.
[0015] Furthermore, the length of the second HDPE sheath in the fourth HDPE sheath is longer than that of the third HDPE sheath, and the desiccant is a desiccant ring sleeved on the extended second HDPE sheath, and the desiccant ring is two semicircular rings that are detachably connected to each other. With the above structure, the manufacture, installation and removal of the desiccant are more convenient, and it is more suitable for regular replacement, which further ensures the technical effect of effectively maintaining the dryness of the air in the HDPE sheath and ensuring that the steel cable is not corroded by humid air.
[0016] Furthermore, the two ends of the sealing ring are inclined transition surfaces or arc-shaped transition surfaces. After adopting the above structure, the production and installation of the sealing ring such as the rubber sealing ring are more convenient, and the sealing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The utility model is a longitudinal sectional structural schematic diagram of the automatic temperature expansion and contraction compensation device when it is applied to the inclined cable and the sheath.
[0018] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of A.
[0019] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of B.
[0020] Figure 4 The utility model is a structural schematic diagram of the automatic temperature expansion and contraction compensation device when it is applied to the inclined cable and the sheath.
[0021] Figure 5 yes Figure 4Schematic diagram of the enlarged structure of C
[0022] Figure 6 yes Figure 5 An enlarged schematic diagram of the explosion structure.
[0023] (above Figure 1 , Figure 4 and Figure 5 The two ends of the inclined cable are omitted, and the other ends of the first HDPE sheath and the second HDPE sheath are omitted).
[0024] As shown in the figure:
[0025] 1. Stay cable;
[0026] 2. first HDPE sheath, 21. first convex ring, 211. first transition slope, 22. first large diameter sleeve, 23. first small diameter sleeve, 24. first oblique sleeve;
[0027] 3. Second HDPE sheath;
[0028] 4. third HDPE sheath, 41. second convex ring, 411. second transition slope, 42. second large diameter sleeve, 43. second small diameter sleeve, 44. second oblique sleeve;
[0029] 5. Sealing ring, 51. Oblique transition surface;
[0030] 6. fourth HDPE sheath, 61. concave ring, 611. third transition slope, 62. semicircular HDPE sheath, 621. connecting plate, 6211. bolt through hole, 63. bolt, 64. nut, 65. sealing gasket;
[0031] 7. Desiccant circle;
[0032] 8. Sealing gasket. DETAILED DESCRIPTION
[0033] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these specific implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical means involved in each specific implementation method of the present invention described below can be combined with each other as long as there is no conflict between them.
[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 shown.
[0035] The utility model discloses an automatic expansion and contraction compensation device for a stay cable sheath under temperature, which can also be called an automatic expansion and contraction compensation device for the stay cable sheath under temperature.
[0036] The utility model discloses an automatic temperature expansion and contraction compensation device for a cable sheath, comprising a first HDPE sheath 2 and a second HDPE sheath 3 which are sleeved on a cable 1, and a distance is left between the first HDPE sheath 2 and the second HDPE sheath 3 in the axial direction. A third HDPE sheath 4 is sleeved on the second HDPE sheath 3, and a sealing ring 5 such as a rubber sealing ring is arranged between the second HDPE sheath 3 and the third HDPE sheath 4. Both ends of the sealing ring 5 can be an inclined transition surface 51 or an arc-shaped transition surface. A fourth HDPE sheath 6 is sleeved on the axially adjacent sections of the first HDPE sheath 2 and the third HDPE sheath 4.
[0037] The stay cable 1 is a steel stay cable, such as a steel strand stay cable.
[0038] A desiccant for absorbing moisture is arranged axially between the first HDPE jacket 2 and the third HDPE jacket 4 in the fourth HDPE jacket 6 .
[0039] The specific installation structure of the desiccant can be: the length of the second HDPE sheath 3 in the fourth HDPE sheath 6 is longer than the length of the third HDPE sheath 4, and the desiccant is a desiccant ring 7 sleeved on the extended second HDPE sheath 3, and the desiccant ring 7 can be two semicircular rings, which are detachably connected to each other. It is not difficult to understand that the outer diameter of the desiccant ring 7 is smaller than the inner diameter of the fourth HDPE sheath 6. The detachable connection of the desiccant ring can be a male and female snap connection, or a screw thread connection, such as a screw through hole is provided on one semicircular desiccant ring, and a threaded hole is provided on the other semicircular desiccant ring, and a screw thread connection is adopted.
[0040] The HDPE is a material of the prior art. HDPE is short for high-density polyethylene (High Density Polyethylene), also known as low-pressure polyethylene. It is a kind of polyethylene with high crystallinity and a certain degree of translucency on the non-polar surface. The desiccant can be a physical desiccant, such as a silica gel desiccant or an activated alumina desiccant, and the desiccant ring can be two semicircular rings of a silica gel desiccant.
[0041] The fourth HDPE sheath 6 is preferably two semicircular HDPE sheaths 62, and the two semicircular HDPE sheaths 62 are fixed by screwing with multiple screws. Screws are also called threaded fastening structures, which generally include screws and bolts and nuts, that is, they can be fixed by screwing with bolts and nuts as shown in the figure, or they can be fixed by screwing with screws in threaded holes. For example, each semicircular sheath 62 is fixed on both sides, such as having its own connecting plate 621 formed in one time, and there are multiple bolt holes 6211 on the connecting plate 621. Multiple bolts 63 are used to pass through multiple one-to-one corresponding bolt holes 6211 on each pair of connecting plates 621 on both sides of each semicircular HDPE sheath 62, and are fixed by screwing with respective nuts 64. Since the fourth HDPE sheath 6 is made of HDPE material, it is not necessary to have a sealing gasket, but it is preferred that two sealing gaskets 65 such as two long rubber sealing gaskets are provided on the connecting surfaces of the two semicircular HDPE sheaths 62 to achieve a better sealing effect. The sealing gasket 65 is also provided with a plurality of bolt holes 6211 corresponding to the bolt holes 6211 on the connecting plate 621.
[0042] There are convex rings and concave rings 61 for mutual axial limitation between the fourth HDPE sheath 6 and the first HDPE sheath 2 and the third HDPE sheath 4, such as convex rings such as the first convex ring 21 and concave ring 61 for mutual axial limitation between the fourth HDPE sheath 6 and the first HDPE sheath 2, and convex rings such as the second convex ring 41 and concave ring 61 for mutual axial limitation between the fourth HDPE sheath 6 and the third HDPE sheath 4. Both ends of each concave ring 61 are transition slopes such as the third transition slope 611, and both ends of each convex ring are transition slopes matching the transition slope of the concave ring 61 such as the first transition slope 211 and the second transition slope 411. The concave ring 61 is also called a groove ring.
[0043] Since the HDPE sheaths are all HDPE, it is not necessary to have a sealing gasket on the contact surface between the convex ring and the concave ring 61, but it is preferred that the contact surface between each concave ring 61 and each convex ring such as the first convex ring 21 and the second convex ring 41 is provided with a sealing gasket 8 such as a respective rubber sealing gasket to achieve a better sealing effect.
[0044] The first HDPE jacket 2 is preferably a stepped jacket, the section axially close to the third HDPE jacket 4 is a large-diameter jacket such as the first large-diameter jacket 22, and the section axially away from the third HDPE jacket 4 is a small-diameter jacket such as the first small-diameter jacket 23. The third HDPE jacket 4 is preferably a stepped jacket, the section axially close to the first HDPE jacket 2 is a large-diameter jacket such as the second large-diameter jacket 42, and the section axially away from the first HDPE jacket 2 is a small-diameter jacket such as the second small-diameter jacket 43. The large-diameter jacket of the first HDPE jacket 2, such as the first large-diameter jacket 22, and the large-diameter jacket of the third HDPE jacket 4, such as the second large-diameter jacket 42, have the same outer diameter.
[0045] The transition section between the large diameter sleeve of the first HDPE jacket 2, such as the first large diameter sleeve 22, and the small diameter sleeve, such as the second small diameter sleeve 43, is an inclined sleeve, such as the first inclined sleeve 24. The transition section between the large diameter sleeve of the third HDPE jacket 4, such as the second large diameter sleeve 42, and the small diameter sleeve, such as the second small diameter sleeve 43, is also an inclined sleeve, such as the second inclined sleeve 44. The inclined sleeve is also called an inclined sleeve, or an inclined pipe, or a cone sleeve.
[0046] The above unmarked parts, structures or quantities are not shown in the drawings. The drawings are for illustration only. If there is any inconsistency between the drawings and the text description or between the drawings, the text description shall prevail.
[0047] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A temperature automatic expansion and contraction compensation device for a stay cable sheath, characterized in that: It includes a first HDPE sheath and a second HDPE sheath which are sleeved on the inclined cable, and an axial distance is left between the first HDPE sheath and the second HDPE sheath; a section of a third HDPE sheath is sleeved on the second HDPE sheath, and a sealing ring is arranged between the second HDPE sheath and the third HDPE sheath; a fourth HDPE sheath is sleeved on the axially adjacent sections of the first HDPE sheath and the third HDPE sheath, and a convex ring and a concave ring which are mutually axially limited are arranged between the fourth HDPE sheath and the first HDPE sheath and the third HDPE sheath; a desiccant for absorbing moisture is arranged axially between the first HDPE sheath and the third HDPE sheath in the fourth HDPE sheath.
2. The temperature automatic expansion and contraction compensation device of the stay cable sheath according to claim 1 is characterized in that: The fourth HDPE sheath is two semicircular HDPE sheaths, and the two semicircular HDPE sheaths are screwed and fixed by a plurality of screws.
3. The temperature automatic expansion and contraction compensation device of the stay cable sheath according to claim 2 is characterized in that: Two sealing gaskets are arranged on the two semicircular HDPE jacket connection surfaces.
4. The temperature automatic expansion and contraction compensation device for the stay cable sheath according to claim 1 is characterized in that: The fourth HDPE sheath has two concave circles on its inner wall, the first HDPE sheath has a convex circle matching the concave circle on its outer wall, and the third HDPE sheath also has a convex circle matching the concave circle on its outer wall. Both ends of each concave circle are transition slopes, and both ends of each convex circle are transition slopes matching the transition slopes of the concave circle.
5. The temperature automatic expansion and contraction compensation device for the stay cable sheath according to claim 1 or 4, characterized in that: A sealing gasket is provided on the connecting surface of each convex ring and concave ring.
6. The temperature automatic expansion and contraction compensation device for the stay cable sheath according to claim 1 is characterized in that: The first HDPE sheath is a stepped sheath, wherein the part axially close to the third HDPE sheath section is a large diameter sheath, and the part axially away from the third HDPE sheath section is a small diameter sheath; the third HDPE sheath is also a stepped sheath, wherein the part axially close to the first HDPE sheath section is a large diameter sheath, and the part axially away from the first HDPE sheath section is a small diameter sheath; the outer diameters of the large diameter sheath of the first HDPE sheath and the large diameter sheath of the third HDPE sheath are equal.
7. The temperature automatic expansion and contraction compensation device for the stay cable sheath according to claim 6 is characterized in that: The transition section between the large diameter sleeve and the small diameter sleeve of the first HDPE sheath is an oblique sleeve; the transition section between the large diameter sleeve and the small diameter sleeve of the third HDPE sheath is also an oblique sleeve.
8. The temperature automatic expansion and contraction compensation device for the stay cable sheath according to claim 1 is characterized in that: The length of the second HDPE sheath in the fourth HDPE sheath is longer than that of the third HDPE sheath. The desiccant is a desiccant ring sleeved on the extended second HDPE sheath. The desiccant ring is two semicircular rings that are detachably connected to each other.
9. The temperature automatic expansion and contraction compensation device for the stay cable sheath according to claim 1, characterized in that: Both ends of the sealing ring are inclined transition surfaces or arc-shaped transition surfaces.