A rail transit composite water-blocking cable and water-blocking device thereof

Abstract

The present invention relates to the technical field of water-blocking cables, and discloses a rail transit composite water-blocking cable and a water-blocking device thereof, comprising a cable body and a water-blocking assembly. The water-blocking assembly comprises multiple groups of water-blocking assemblies, wherein the water-blocking assembly comprises a first water-blocking unit, a second water-blocking unit, a third water-blocking unit, a fourth water-blocking unit, a fifth water-blocking unit, and a sixth water-blocking unit uniformly arranged along the circumferential direction of the cable body. The first water-blocking unit comprises a first cement support layer, a second cement support layer, an SAP water-absorbing layer, a hydrogel water-absorbing layer, and an electric heating wire. The first water-blocking unit can utilize the infiltrated water to achieve beneficial conversion, realize effective utilization of the water, prevent further water infiltration, and greatly improve the self-healing ability of the cable body during use. At the same time, the electric heating wire can be used to evaporate the water inside the SAP water-absorbing layer, the first cement support layer, and the second cement support layer, thereby not only completing the waterproof seal, but also enhancing the supporting strength of the cable body.

Description

Technical Field

[0001] The present invention relates to the technical field of water-blocking cables, and in particular to a rail transit composite water-blocking cable and a water-blocking device thereof. Background Art

[0002] Urban rail transit is currently the main measure for improving the traffic environment in major international cities. Due to the particularity of rail transit, the safety and reliability requirements of the power system are extremely high. Due to the influence of environmental and meteorological factors, the cables used in urban light rail subways may be laid in a humid environment for a long time. Water molecules may penetrate into the cables and invade the interior of the cables. They are absorbed by the insulation, causing a decline in electrical performance and oxidation and corrosion of the conductors. This not only affects the electrical performance of the cables, but also may cause abnormal disconnection accidents in severe cases.

[0003] A copper wire shielded dynamic control composite water-blocking cable for urban rail transit with application number CN201510893256.4, the control line core layer includes a wrapped high flame retardant water-blocking tape, an extruded second inner sheath layer, an extruded outer sheath layer, and a metal water-blocking protective layer from the inside to the outside. It has high insulation performance, flame retardant grade A, low smoke and halogen-free, good comprehensive water-blocking effect, anti-rat and anti-ant, anti-ultraviolet, anti-electric field interference, and good bending performance; a water-blocking cable with application number CN202022588453.4, a hydrogel is arranged in the water-blocking tape, and the hydrogel absorbs moisture entering the cable and expands to form a water-blocking dam, thereby locking the moisture and preventing the diffusion of moisture, improving the waterproof and electrical properties of the cable, and avoiding insulation damage.

[0004] However, although the double-layer sheath and metal water-blocking sheath on the outside of the cable can increase radial waterproofness, during the operation of the cable, especially during power supply operation, if a local cable breakdown occurs, moisture will penetrate into the cable through the breakdown point, causing a leakage hazard. The hydrogel used in the above-mentioned document achieves waterproofing by absorbing water. However, this application measure is only a remedial measure, and because the hydrogel has good water absorption, it will aggravate the penetration of moisture, posing a safety hazard, and cannot fundamentally solve the problem of cable water seepage.

[0005] Therefore, the present invention solves the above-mentioned problems through a rail transit composite water-blocking cable and a water-blocking device thereof. Summary of the Invention

[0006] The object of the present invention is to provide a rail transit composite water-blocking cable and a water-blocking device thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a rail transit composite water-blocking cable, comprising a cable body and a water-blocking assembly, wherein the water-blocking assembly comprises a first water-blocking unit, a second water-blocking unit, a third water-blocking unit, a fourth water-blocking unit, a fifth water-blocking unit, and a sixth water-blocking unit uniformly arranged along the circumference of the cable body;

[0008] The cable body includes a protective layer, an inner side of the protective layer is extruded with a shielding layer, an outer side of the protective layer is extruded with a water-blocking layer, the water-blocking component is embedded in the protective layer, and a water-blocking groove matching the water-blocking component is provided in the protective layer;

[0009] The first water-blocking unit includes a water-blocking support seat fixed inside the water-blocking groove near the shielding layer side, and also includes a first cement supporting layer and a second cement supporting layer fixed inside the water-blocking groove near the water-blocking layer side, the first cement supporting layer and the second cement supporting layer are arranged at intervals, the first cement supporting layer and the second cement supporting layer are wrapped around the outside of the SAP water-absorbing layer, and the SAP water-absorbing layer is integrally provided with a first water-blocking section arranged between the first cement supporting layer and the second cement supporting layer, and the SAP water-absorbing layer is integrally provided with a second water-blocking section arranged between the water-blocking support seat and the first cement supporting layer.

[0010] Preferably, the first water-blocking unit, the second water-blocking unit, the third water-blocking unit, the fourth water-blocking unit, the fifth water-blocking unit and the sixth water-blocking unit have the same structure, and a hydrogel water-absorbing layer is filled between each group of the SAP water-absorbing layer and the water-blocking support seat.

[0011] Preferably, a pressurized air bag is provided at the center of the hydrogel water-absorbing layer, two adjacent groups of pressurized air bags are connected by a pressure relief air pipe, and a pressure relief valve is fixedly mounted on each group of pressure relief air pipes.

[0012] Preferably, the hydrogel water-absorbing layer consists of a non-woven bag and hydrogel, and the non-woven bag is filled with hydrogel, and the size of the hydrogel water-absorbing layer matches the size of the water-blocking groove, the pressurized air bag is elliptical, and the length of the pressurized air bag is the same as the length of the water-blocking groove.

[0013] Preferably, the first water-proof section and the second water-proof section are both strip-shaped, and the SAP water-absorbing layer is embedded with a winding electric heating wire, which runs through the second water-proof section, the SAP water-absorbing layer and the first water-proof section, and the SAP water-absorbing layer is built with conductive terminals corresponding to the two ends of the electric heating wire.

[0014] Preferably, the cable body also includes a core conductor at the center, the outer wall of the core conductor is extruded with an insulating sheath, and the insulating sheath is arranged on the inner side of the shielding layer, the outer wall of the water-blocking layer is extruded with a flame retardant layer, and the outer wall of the flame retardant layer is extruded with an outer sheath.

[0015] Preferably, the top of the water-blocking groove is in contact with the water-blocking layer, the bottom of the water-blocking groove is in contact with the shielding layer, and the water-blocking support seat is an arched reinforcement seat in contact with the inner side wall of the water-blocking groove.

[0016] The present invention discloses a water-blocking device, which includes several groups of water-blocking components, and the water-blocking components are arranged linearly along the length direction of the cable body. The distribution positions of the water-blocking components are planned according to the actual application environment to achieve the purpose of targeted waterproof and pressure-resistant protection based on the working environment, which can well realize the self-protection of the cable.

[0017] Technical effects and advantages of the present invention:

[0018] 1. The cable body of the present invention has multiple sets of water-blocking components embedded in it, which can realize overall waterproof protection of the cable body through the water-blocking components. Of course, in actual use, the distribution position of the water-blocking components is planned according to the actual application environment to achieve the purpose of targeted waterproof and pressure-resistant protection based on the working environment, which can well realize the self-protection of the cable.

[0019] 2. When the amount of water infiltration is small, the water-blocking device of the present invention first absorbs the water through the outermost first cement support layer or the second cement support layer, completing the preliminary water absorption operation, and then filling the cracks. The SAP water-absorbing layer can absorb the water and use its own adhesion after absorbing water to fill the water seepage area, completing self-water seepage remediation. In this way, the infiltrated water can be used to achieve benefit conversion, realize effective utilization of water, avoid further water infiltration, and greatly improve the self-healing ability of the cable body during use.

[0020] 3. When a large amount of water penetrates into the water-blocking device of the present invention, the excess water in the SAP water-absorbing layer will be absorbed by the hydrogel water-absorbing layer. In this way, the hydrogel water-absorbing layer will expand after the water absorption is completed. The squeezing force on the SAP water-absorbing layer is achieved through its own expansion, thereby increasing the density of the SAP water-absorbing layer and slowing down the water seepage rate. Moreover, the electric heating wire is connected to the circuit and starts working, which can evaporate the water inside the SAP water-absorbing layer, the first cement supporting layer and the second cement supporting layer, making it convenient to reuse the SAP water-absorbing layer to complete the secondary water absorption operation. The first cement supporting layer and the second cement supporting layer will solidify due to the evaporation of water, which not only completes the waterproof seal, but also enhances the supporting strength of the cable body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the cable body structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the cable body of the present invention;

[0023] Figure 3 This is a schematic diagram of a partial cross-sectional structure of the cable body of the present invention;

[0024] Figure 4 This is a schematic structural diagram of the cable body and water blocking device assembled from a first perspective of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the water blocking device of the present invention;

[0026] Figure 6 This is a schematic structural diagram of the cable body and the water blocking device assembled from a second perspective of the present invention;

[0027] Figure 7 This is a schematic diagram of the enlarged structure of part A of the present invention;

[0028] Figure 8 This is a schematic structural diagram of the water-blocking assembly of the present invention;

[0029] Figure 9 This is a schematic structural diagram of the first water-blocking unit of the present invention;

[0030] Figure 10 This is a structural schematic diagram of the water-blocking assembly of the present invention in use.

[0031] In the figure: 10. Cable body; 11. Core conductor; 12. Insulating sheath; 13. Shielding layer; 14. Protective layer; 15. Water-blocking layer; 16. Flame-retardant layer; 17. Outer sheath; 18. Water-blocking groove; 20. First water-blocking unit; 21. Water-blocking support seat; 22. First cement supporting layer; 23. Second cement supporting layer; 24. SAP water-absorbing layer; 25. First water-isolating section; 26. Second water-isolating section; 27. Electric heating wire; 28. Hydrogel water-absorbing layer; 29. ​​Pressurized air bag; 210. Pressure relief air pipe; 30. Second water-blocking unit; 40. Third water-blocking unit; 50. Fourth water-blocking unit; 60. Fifth water-blocking unit; 70. Sixth water-blocking unit. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] This embodiment provides Figures 1 to 10A rail transit composite water-blocking cable shown includes a cable body 10 and a water-blocking component. When the cable body 10 is in use, not only is the cable body 10 itself protected, but the water-blocking component can also enhance the waterproof protection of the internal wire core provided by the cable body 10. The water-blocking component includes a first water-blocking unit 20, a second water-blocking unit 30, a third water-blocking unit 40, a fourth water-blocking unit 50, a fifth water-blocking unit 60, and a sixth water-blocking unit 70 uniformly arranged along the circumferential direction of the cable body 10. A water-blocking structure is arranged along the circumferential direction inside the cable body 10, which can enhance the water-blocking protection of the cable body 10 and prevent moisture from penetrating and causing a short circuit in the wire core.

[0034] The cable body 10 includes a protective layer 14, the inner side of the protective layer 14 is extruded with a shielding layer 13, the outer side of the protective layer 14 is extruded with a water-blocking layer 15, the water-blocking component is embedded in the protective layer 14, and the protective layer 14 is provided with a water-blocking groove 18 that matches the water-blocking component. The cable body 10 also includes a core conductor 11 at the center, the outer side wall of the core conductor 11 is extruded with an insulating sheath 12, and the insulating sheath 12 is arranged on the inner side of the shielding layer 13, the outer side wall of the water-blocking layer 15 is extruded with a flame-retardant layer 16, and the outer side wall of the flame-retardant layer 16 is extruded with an outer sheath 17.

[0035] During use, the outer sheath 17 ensures the wear resistance of the cable, while the flame retardant layer 16 improves the corrosion and fire resistance of the cable, the water-blocking layer 15 enhances the waterproof protection, the shielding layer 13 ensures the electromagnetic shielding of the core conductor 11, and the insulating sheath 12 can ensure the insulation protection of the core conductor 11, and the protective layer 14 can strengthen the water-blocking effect of the water-blocking layer 15, so as to improve the protection of the shielding layer 13 and prevent moisture from penetrating and affecting the normal operation of the core conductor 11.

[0036] See also Figure 2-Figure 4 The first water-blocking unit 20 includes a water-blocking support seat 21 fixed inside the water-blocking groove 18 near the shielding layer 13. The top of the water-blocking groove 18 is in contact with the water-blocking layer 15, and the bottom of the water-blocking groove 18 is in contact with the shielding layer 13. The water-blocking support seat 21 is an arched reinforcement seat that is in contact with the inner wall of the water-blocking groove 18, thereby improving the supporting protection and strengthening the supporting strength of the cable body 10.

[0037] See also Figure 4-Figure 9The first water-blocking unit 20 further includes a first cement supporting layer 22 and a second cement supporting layer 23 fixed inside the water-blocking groove 18 near the water-blocking layer 15. The first cement supporting layer 22 and the second cement supporting layer 23 are spaced apart. The first cement supporting layer 22 and the second cement supporting layer 23 are wrapped around the outside of the SAP water-absorbing layer 24. A first water-blocking section 25 arranged between the first cement supporting layer 22 and the second cement supporting layer 23 is integrally formed on the SAP water-absorbing layer 24. A second water-blocking section 26 arranged between the water-blocking support seat 21 and the first cement supporting layer 22 is integrally formed on the SAP water-absorbing layer 24.

[0038] It should be noted that SAP (Super Absorbent Polymer) is a synthetic polymer material with extremely high water absorption capacity. This material can absorb and retain water equivalent to hundreds or even thousands of times its own weight. Due to its unique physical and chemical properties, SAP material has a wide range of applications in many fields.

[0039] It should be noted that the first cement supporting layer 22 is angled and arranged at the top corner of the water blocking groove 18, while the cross-section of the second cement supporting layer 23 is arc-shaped and has the same thickness as the first cement supporting layer 22. The second cement supporting layer 23 is provided in two groups and arranged between the two groups of first cement supporting layers 22. It is also attached to the inner wall of the water blocking layer 15, has a high degree of fit and a large specific surface area, which is convenient for absorbing the infiltrated water. The first water-blocking section 25 is filled between the first cement supporting layer 22 and the second cement supporting layer 23, ensuring the compactness of the structure while facilitating the first water-blocking section 25 to penetrate into the water blocking layer 15, the first cement supporting layer 22, and the second cement supporting layer 23. The connection between the cement supporting layer 23 structures, similarly, the second water-blocking section 26 can penetrate into the connection between the first cement supporting layer 22, the protective layer 14, and the water-blocking support seat 21, and the SAP water-absorbing layer 24 has a strong water absorption capacity. After absorbing water, SAP will self-solidify into a colloidal substance and have good adhesion. It uses its own adhesion after absorbing water to fill the seepage points, complete self-seepage remediation, avoid further water seepage, and achieve a preliminary water-blocking effect. At the same time, it enhances the limiting properties of the first cement supporting layer 22 and the second cement supporting layer 23 inside the water-blocking groove 18, which can effectively fill the gaps between the structures.

[0040] See also Figure 6 and Figure 7The first water-blocking unit 20, the second water-blocking unit 30, the third water-blocking unit 40, the fourth water-blocking unit 50, the fifth water-blocking unit 60, and the sixth water-blocking unit 70 have the same structure, and a hydrogel water-absorbing layer 28 is filled between each group of SAP water-absorbing layers 24 and the water-blocking support seat 21. The water-blocking support seat 21 can act as a reinforcing rib to provide anti-torsion protection for the cable body 10 and can also support and limit the hydrogel water-absorbing layer 28 so that the hydrogel water-absorbing layer 28 generates a squeezing force on the SAP water-absorbing layer 24 after absorbing water and expanding, thereby enhancing the distribution density of the SAP water-absorbing layer 24 in the water-blocking groove 18, increasing the amount of filling at the water seepage point based on its own adhesion, and improving the anti-water seepage performance.

[0041] See also Figure 7-Figure 9 A pressurized air bag 29 is provided at the center of the hydrogel water-absorbing layer 28. Two adjacent groups of pressurized air bags 29 are connected by a pressure relief air pipe 210, and each group of pressure relief air pipes 210 is fixedly equipped with a pressure relief valve. After the hydrogel water-absorbing layer 28 completes water absorption, it will expand and achieve squeezing force on the SAP water-absorbing layer 24 through its own expansion. Moreover, after the hydrogel water-absorbing layer 28 expands, it will simultaneously squeeze the pressurized air bag 29. In this way, the water absorption amount of the hydrogel water-absorbing layer 28 can be reflected by the internal pressure value of the pressurized air bag 29 after squeezing and shrinking, so as to perform real-time detection of the water seepage of the cable body 10, facilitate inspection and maintenance, and enhance real-time protection.

[0042] It should be noted that the hydrogel water-absorbing layer 28 is composed of a non-woven bag and hydrogel, and the non-woven bag is filled with hydrogel, and the size of the hydrogel water-absorbing layer 28 matches the size of the water-blocking groove 18, the pressurized air bag 29 is elliptical, and the length of the pressurized air bag 29 is the same as the length of the water-blocking groove 18. In this way, when the hydrogel inside the hydrogel water-absorbing layer 28 absorbs water, it will expand, thereby completing the squeezing of the SAP water-absorbing layer 24, prompting it to fit tightly on the inner wall of the water-blocking groove 18, enhancing the compaction, and achieving a water-blocking effect.

[0043] See 7 and Figure 9 The first water-proof section 25 and the second water-proof section 26 are both strip-shaped, and the SAP water-absorbing layer 24 is embedded with a winding electric heating wire 27. The electric heating wire 27 runs through the second water-proof section 26, the SAP water-absorbing layer 24 and the first water-proof section 25, and the SAP water-absorbing layer 24 is built with conductive terminals corresponding to the two ends of the electric heating wire 27.

[0044] When the hydrogel water-absorbing layer 28 absorbs water, the pressurized air bag 29 is squeezed, the internal gas pressure increases, and the pressure relief valve can detect the internal pressure value in real time, which facilitates the control of the two sets of conductive terminals to be energized, prompting the electric heating wire 27 to be connected to the circuit and start working, and can heat the SAP water-absorbing layer 24 to achieve drying treatment. In this way, the water inside the SAP water-absorbing layer 24 can be evaporated, which is convenient for its reuse. The evaporated water can be absorbed by the hydrogel water-absorbing layer 28, further increasing the expansion of the hydrogel water-absorbing layer 28 and increasing the squeezing force on the SAP water-absorbing layer 24. At the same time, the expanded hydrogel water-absorbing layer 28 can provide the cable body 10 with a better pressure-resistant buffering effect.

[0045] This embodiment also discloses a water-blocking device, which includes several groups of water-blocking components, and the water-blocking components are arranged linearly along the length direction of the cable body 10. The water-blocking components can achieve overall waterproof protection for the cable body 10. Of course, in actual use, the distribution position of the water-blocking components is planned according to the actual application environment to achieve the purpose of targeted waterproof and pressure-resistant protection based on the working environment.

[0046] Specifically, when the cable body 10 is partially damaged or cracks appear due to extrusion during use, external moisture will flow into the water-blocking groove 18 along the cracks. At this time, the moisture is first absorbed by the outermost first cement supporting layer 22 or the second cement supporting layer 23, completing the preliminary water absorption operation. At this time, the first cement supporting layer 22 or the second cement supporting layer 23 is in a muddy state. As the water absorption amount of the first cement supporting layer 22 or the second cement supporting layer 23 increases, the SAP water-absorbing layer 24 can absorb the moisture. After absorbing the moisture, the SAP will self-solidify into a colloidal substance with good adhesion. It uses its own adhesion after absorbing water to fill the water seepage and complete self-water seepage remediation. At the same time, the first cement supporting layer 22 or the second cement supporting layer 23 fills the cracks to repair the cracks. In this way, the infiltrated moisture can be used to achieve benefit conversion, realize effective utilization of moisture, avoid further infiltration of moisture, and greatly improve the self-healing ability of the cable body 10 during use.

[0047] It should be noted that when the cable body 10 breaks during actual use and causes large cracks, the water infiltration rate increases. At this time, the adhesion of the SAP water-absorbing layer 24 alone is not enough to make up for the cracks, resulting in a large amount of water infiltration. At this time, the excess water in the SAP water-absorbing layer 24 will be absorbed by the hydrogel water-absorbing layer 28. In this way, after the hydrogel water-absorbing layer 28 completes water absorption, it will expand and achieve squeezing force on the SAP water-absorbing layer 24 through its own expansion, thereby increasing the density of the SAP water-absorbing layer 24 and slowing down the water infiltration rate. When the pressure relief valve detects that the gas pressure value inside the pressurized air bag 29 reaches the first threshold value, it indicates that the water absorption of the hydrogel water-absorbing layer 28 reaches the first warning threshold value, indicating that the amount of water infiltrated into the water-blocking groove 18 is relatively large. At this time, the two sets of conductive terminals are controlled to be energized, prompting the electric heating wire 27 to be connected to the circuit and start working, which can heat the SAP water-absorbing layer 24, the first cement support layer 22, and the second cement support layer 23 to achieve drying treatment. In this way, the moisture inside the SAP water-absorbing layer 24, the first cement supporting layer 22, and the second cement supporting layer 23 can be evaporated, making it convenient for the SAP water-absorbing layer 24 to be reused to complete the secondary water absorption operation. The first cement supporting layer 22 and the second cement supporting layer 23 will solidify due to the evaporation of moisture, so that the first cement supporting layer 22 and the second cement supporting layer 23 filled in the cracks complete the repair work, not only completing the waterproof seal, but also enhancing the supporting strength of the cable body 10. The evaporated moisture can be absorbed by the hydrogel water-absorbing layer 28, further increasing the expansion of the hydrogel water-absorbing layer 28, and increasing the squeezing force on the SAP water-absorbing layer 24, the first cement supporting layer 22, and the second cement supporting layer 23. The heating and drying operation of the electric heating wire 27 is used to complete the repair of the cracks and achieve self-repair. Moreover, when the cable body 10 is squeezed by the outside world, the expanded hydrogel water-absorbing layer 28 can use its own elasticity to enhance the compressive buffering properties of the cable body 10.

[0048] It should be noted that when the hydrogel water-absorbing layer 28 absorbs a large amount of water, the squeezing force on the pressurized air bag 29 will increase. When the gas inside it increases to the second warning threshold, it indicates that the amount of water seepage inside the water-blocking groove 18 is too large, which seriously affects the safety of the cable body 10. At this time, the pressure relief valve opens, prompting the gas in the pressurized air bag 29 to be introduced into the adjacent water-blocking unit through the pressure relief air pipe 210 to achieve pressure relief, making it easier for the hydrogel water-absorbing layer 28 to absorb water again, completing the extreme water-blocking protection of the cable body 10. At the same time, the cable body 10 sends a maintenance signal to the remote control end through the core conductor 11, alerting the staff to perform rapid maintenance.

[0049] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite water-blocking cable for rail transit, characterized by: The invention comprises a cable body (10) and a water-blocking assembly, wherein the water-blocking assembly comprises a first water-blocking unit (20), a second water-blocking unit (30), a third water-blocking unit (40), a fourth water-blocking unit (50), a fifth water-blocking unit (60), and a sixth water-blocking unit (70) uniformly arranged along the circumferential direction of the cable body (10); The cable body (10) includes a protective layer (14), an inner extrusion package of the protective layer (14) is provided with a shielding layer (13), an outer extrusion package of the protective layer (14) is provided with a water-blocking layer (15), a water-blocking component is embedded in the protective layer (14), and a water-blocking groove (18) matching the water-blocking component is provided in the protective layer (14); The first water-blocking unit (20) includes a water-blocking support seat (21) fixed inside the water-blocking groove (18) near the shielding layer (13), and also includes a first cement support layer (22) and a second cement support layer (23) fixed inside the water-blocking groove (18) near the water-blocking layer (15), the first cement support layer (22) and the second cement support layer (23) being arranged at intervals, the first cement support layer (22) and the second cement support layer (23) being wrapped around the outside of the SAP water-absorbing layer (24), the SAP water-absorbing layer (24) being integrally formed with a first water-blocking section (25) arranged between the first cement support layer (22) and the second cement support layer (23), and the SAP water-absorbing layer (24) being integrally formed with a second water-blocking section (26) arranged between the water-blocking support seat (21) and the first cement support layer (22); each group of SAP water-absorbing layers (24) and water-blocking support seat (21) is filled with a hydrogel water-absorbing layer (28); a pressurized air bag (29) is arranged in the center of the hydrogel water-absorbing layer (28), and two adjacent groups of pressurized air bags (29) are connected by a pressure relief air pipe (210), and each group of pressure relief air pipes (210) is fixedly equipped with a pressure relief valve; the first water-proof section (25) and the second water-proof section (26) are both strip-shaped, and a winding electric heating wire (27) is embedded in the SAP water-absorbing layer (24), and the electric heating wire (27) passes through the second water-proof section (26), the SAP water-absorbing layer (24) and the first water-proof section (25), and the SAP water-absorbing layer (24) is built with conductive terminals corresponding to the two ends of the electric heating wire (27); when the pressure relief valve detects that the gas pressure value inside the pressurized air bag reaches a first threshold value, the two groups of conductive terminals are controlled to be energized, and the electric heating wire is connected to the circuit to heat the SAP water-absorbing layer, the first cement support layer, and the second cement support layer.

2. The rail transit composite water-blocking cable according to claim 1, characterized in that: The first water-blocking unit (20), the second water-blocking unit (30), the third water-blocking unit (40), the fourth water-blocking unit (50), the fifth water-blocking unit (60) and the sixth water-blocking unit (70) have the same structure.

3. The rail transit composite water-blocking cable according to claim 2, characterized in that: The hydrogel water-absorbing layer (28) is composed of a non-woven bag and hydrogel, the non-woven bag is filled with hydrogel, the size of the hydrogel water-absorbing layer (28) matches the size of the water-blocking groove (18), the pressurized air bag (29) is elliptical, and the length of the pressurized air bag (29) is the same as the length of the water-blocking groove (18).

4. The rail transit composite water-blocking cable according to claim 3, characterized in that: The cable body (10) further includes a core conductor (11) at the center, an outer wall of the core conductor (11) is extruded with an insulating sheath (12), the insulating sheath (12) is arranged on the inner side of the shielding layer (13), a flame retardant layer (16) is extruded on the outer wall of the water-blocking layer (15), and an outer sheath (17) is extruded on the outer wall of the flame retardant layer (16).

5. The rail transit composite water-blocking cable according to claim 4, characterized in that: The top of the water blocking groove (18) is in contact with the water blocking layer (15), the bottom of the water blocking groove (18) is in contact with the shielding layer (13), and the water blocking support seat (21) is an arched reinforcement seat in contact with the inner wall of the water blocking groove (18).

6. A water blocking device, characterized in that: The water-blocking device comprises the water-blocking assembly as claimed in claim 5, and the water-blocking assembly is linearly arranged along the length direction of the cable body (10).

Images