Composite cable for urban underground comprehensive pipe gallery
By designing composite cables for urban underground utility tunnels, and adopting a composite structure of water-blocking, fire-resistant materials and copper sheaths, the problem of communication interruption in the event of a fire was solved, ensuring uninterrupted power and communication, providing real-time monitoring and safety early warning, and reducing cable laying and maintenance costs.
Patent Information
- Application Number
- CN202421729317.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-07-22
AI Technical Summary
Existing cables used in urban underground utility tunnels lack real-time monitoring, operation management, and safety early warning capabilities within the tunnels, and cannot effectively guarantee uninterrupted power and communication in the event of a fire.
Design a composite cable for urban underground utility tunnels, comprising power cable units, optical cable units, and signal control cable units. Employ a composite structure with water-blocking, fire-resistant materials and a copper sheath to ensure the cable does not melt at high temperatures and possesses signal control and network transmission functions.
It ensures uninterrupted power and communication in the event of a fire, provides real-time monitoring and safety early warning capabilities, reduces cable laying and maintenance costs, and uses environmentally friendly, non-toxic, and odorless materials.
Smart Images
Figure CN223582744U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cable technical field, concretely is a kind of composite cable for urban underground comprehensive pipe gallery. BACKGROUND
[0002] Photoelectric comprehensive cable integrates optical cable, power cable and communication cable, saves a lot of space and construction cost, thereby meeting the high-speed development of communication network, underground comprehensive pipe gallery is the public tunnel for the centralized laying of power, communication, broadcast television, water supply and other municipal pipelines in urban underground.
[0003] The construction of comprehensive pipe gallery project should develop towards intelligence, through the construction of BIM engineering management platform, Internet of Things equipment, intelligent pipe gallery operation center, intelligent pipe gallery data center and other software and hardware infrastructures and application systems, covering the whole life cycle of comprehensive pipe gallery project, realizing the intelligence of pipe network planning, construction, operation, maintenance and management, service, guaranteeing the safety, efficiency, intelligence and green of pipe network whole life period, thereby improving urban infrastructure function and urban operation capacity.
[0004] Intelligent pipe gallery system is a comprehensive system integration technology using Internet of Things, modern sensing technology, cloud computing, computer communication technology, virtual reality, artificial intelligence, etc., for real-time monitoring, operation management and safety warning of pipeline, environment, equipment and operation in comprehensive pipe gallery. Strengthen the construction management and safe operation of urban underground comprehensive pipe gallery, so that the operation and management level of underground pipe gallery can adapt to the needs of economic and social development, improve emergency disaster prevention capacity, provide support for operation and maintenance, emergency disaster prevention and public service, improve urban comprehensive carrying capacity and urbanization development needs. In order to achieve the above purpose, a kind of composite cable for urban underground comprehensive pipe gallery is provided, which can not only provide power, but also has signal control and network transmission capacity, and has fireproof and waterproof capacity, and the product is environmentally friendly and safe. SUMMARY
[0005] The technical problem to be solved by the utility model is to provide a kind of composite cable for urban underground comprehensive pipe gallery, which can effectively solve the problems in the prior art.
[0006] The technical scheme adopted by the utility model is: a kind of composite cable for urban underground comprehensive pipe gallery, including power cable unit, optical cable unit and signal control cable unit, the power cable unit, optical cable unit and signal control cable unit are stranded into cable in clockwise direction, the interspace of the power cable unit, optical cable unit and signal control cable unit is filled with water-blocking filling five, the outer side of water-blocking filling five is covered with water-blocking tape five, the outer side of water-blocking tape five is covered with fire-resistant layer, the outer side of fire-resistant layer is covered with copper sheath, the outer side of copper sheath is covered with flame-retardant sheath;
[0007] The power cable unit comprises conductor one, mica tape, insulation tape, water-blocking filling one, flame-retardant wrapping and outer sheath one, the conductor one is wrapped with mica tape outside, the mica tape is wrapped with insulation tape outside, the mica tape and the insulation tape form a double-layer fireproof insulation structure, the four conductors one are filled with water-blocking filling one in gaps, the water-blocking filling one is wrapped with flame-retardant wrapping outside, the flame-retardant wrapping is wrapped with outer sheath one outside.
[0008] The optical cable unit comprises optical fiber bundle tube, central reinforcing member, water-blocking filling two, water-blocking tape one and outer sheath two, the five optical fiber bundle tubes are provided with central reinforcing member in the center, the optical fiber bundle tubes and the central reinforcing member are twisted into a cable, the optical fiber bundle tubes and the central reinforcing member are filled with water-blocking filling two in the hollow, the water-blocking filling two is wrapped with water-blocking tape one outside, the water-blocking tape one is wrapped with outer sheath two outside.
[0009] The signal control cable unit comprises conductor two, insulation layer, water-blocking filling three, water-blocking tape two, shielding layer, water-blocking filling four, water-blocking tape four, outer sheath three and core group, the conductor two is wrapped with insulation layer outside, the two conductors two are twisted and filled with water-blocking filling three in gaps, the water-blocking filling three is wrapped with water-blocking tape two outside, the water-blocking tape two is wrapped with shielding layer outside, the conductor two, the insulation layer, the water-blocking filling three, the water-blocking tape two and the shielding layer form a core group, the three core groups are arranged in a clockwise direction and the outermost layer is twisted to the right, the three core groups are filled with water-blocking filling four in gaps, the water-blocking filling four is wrapped with water-blocking tape four outside, the water-blocking tape four is wrapped with outer sheath three outside.
[0010] Preferably, the conductor one adopts a circular tight-pressed copper conductor, the thickness of the mica tape is 0.14 mm, and the thickness of the insulation tape is 1.0 mm-2.5 mm.
[0011] Through the above technical solution, the conductor one adopts a circular tight-pressed copper conductor, the conductor structure is compact, and under the same conductor cross-sectional area, the outer diameter of the conductor is reduced by about 10% after being tight-pressed, thereby reducing the product outer diameter and facilitating installation and laying.
[0012] Preferably, the water-blocking filling one adopts inorganic non-combustible expanded glass fiber rope, the flame-retardant wrapping 105 adopts halogen-free high-flame-retardant tape, and the thickness of the outer sheath one is 1.5 mm.
[0013] By the technical scheme, the mica tape and the insulating tape are used to form a double fireproof and insulating structure, the mica tape can be not broken down within 90 minutes under the temperature of 850-900 DEG C and the voltage of 600-1000 V, has stable chemical properties, excellent acid and alkali resistance, excellent aging resistance and excellent environmental protection performance, does not contain toxic and harmful components, and does not generate toxic gas under high temperature, the insulating tape is made of ceramicized polyolefin insulating material, has the characteristics of ordinary polyolefin insulating material, excellent fireproof and fireproof characteristics, can form a hard ceramic shell under the burning of flame, the hard shell is not melted and dripped under the fire environment (650 DEG C-3000 DEG C), has very good heat insulation and fire insulation effect, and can ensure the smoothness of power and communication under the fire condition, and gains valuable time for personnel escape and fire rescue.
[0014] Preferably, the outer diameter of the optical fiber bundle tube is φ2.0mm-φ2.5mm, the wall thickness is greater than or equal to 0.35mm, the optical fiber bundle tube has 2-12 core optical fibers per tube, the central reinforcing member is made of a non-metallic reinforcing member FRP, the second outer sheath is made of AT electric track resistant sheath material, and the thickness of the second outer sheath is 1.2mm.
[0015] By the technical scheme, the central reinforcing member is made of a non-metallic reinforcing member FRP, and the strength of the optical cable unit is improved.
[0016] Preferably, the second conductor is made of oxygen-free copper wire with a specification of 0.5mm2-4mm2, the insulating layer is made of extruded ceramicized polyolefin insulating material, and the shielding layer is made of 0.05mm polyester tape wound and wrapped in two layers and 0.1mm thick copper-plastic composite tape.
[0017] By the technical scheme, the insulating layer is made of extruded ceramicized polyolefin insulating material with a volume resistivity greater than or equal to 2*1015 ohm*cm. The crust forms fast and is hard; under the condition of with flame and without flame at 350-1600 DEG C, the crust can be burned into a hard shell, the higher the temperature and the longer the time, the harder the ceramic shell after burning, the residue is pure ceramic inorganic matter, the ceramic shell can form a dense honeycomb-shaped fine pore in the ablation process, and a layer of "porcelain enamel" film can be formed on the surface to have the effects of fire resistance, fire blocking, heat insulation and temperature insulation, the shielding layer is made of 0.05mm polyester tape wound and wrapped in two layers and 0.1mm thick copper-plastic composite tape, and the communication line core is shielded from electromagnetic interference.
[0018] Preferably, the fireproof layer is made of ceramicized polyolefin material, and the copper sheath is a corrugated copper tape sheath made by argon arc welding and rolling.
[0019] The fireproof layer adopts ceramicized polyolefin material, the ceramicized polyolefin material can be self-extinguished and not spread, the oxygen index is greater than or equal to 35; under the condition of flame and non-flame at 350 DEG C to 1600 DEG C, the ceramicized polyolefin material does not melt, drip and fall off, and cannot cause secondary fire, and can be burned into a hard ceramic armor, the higher the temperature and the longer the time, the harder the ceramic armor after burning, the residual amount is greater than 80%, the ceramic armor can form a honeycomb ceramic fine pore, and good fireproof effect can be achieved, the excellent flame retardance can also play a good fireproof role, the copper sheath is a corrugated copper belt sheath made by argon arc welding, the mechanical property of the cable can be improved, the impact resistance is enhanced, the cable has good bending property, the argon arc welding forms a sealed environment for the metal sheath, the cable has good waterproof property, and can be prevented from being corroded and bitten by insects, in the case that the outer sheath is damaged, the cable core inside can be effectively protected, and the cable can normally operate; the copper sheath can play a shielding role, effectively shields external electromagnetic interference, and plays a total shielding role.
[0020] Preferably, the thickness of the flame-retardant sheath is 2mm to 4mm, and the flame-retardant sheath adopts B1-grade flame-retardant low-smoke halogen-free sheath material, and special termite prevention agents and additives are added.
[0021] Through the technical scheme, the flame-retardant sheath adopts B1-grade flame-retardant low-smoke halogen-free sheath material, and special termite prevention agents and additives are added, so that the flame-retardant sheath can prevent the breeding of mould and aquatic parasites for a long time, effectively prevent the biting of termites, has excellent corrosion resistance and corrosion resistance, and plays a protection role.
[0022] Compared with the prior art, the utility model provides a kind of composite cable for city underground comprehensive pipe gallery, with the following beneficial effects:
[0023] 1、The composite cable for city underground comprehensive pipe gallery has information control, network interconnection and power transmission functions, uses composite structure to combine different functional products together, reduces cable laying cost, can realize power optical fiber to house connection and power line monitoring, early warning functions synchronously, improves fault reaction speed and reduces line maintenance cost;
[0024] 2、The composite cable for city underground comprehensive pipe gallery has excellent fire resistance: the cable does not melt under the rated working voltage with flame temperature not less than 750 DEG C within 90min supply fire time;
[0025] 3、The composite cable for city underground comprehensive pipe gallery has reasonable structure and selects suitable fireproof material, which meets the needs of cable fire resistance, considers material selection, structure size and electrical performance, and reduces cost.
[0026] 3. The composite cables used in the city's underground utility tunnel are free of heavy metals, non-toxic, odorless, and have no impact on human health or the environment; they are also ant-proof, rodent-proof, waterproof, and oil-resistant. Attached Figure Description
[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;
[0029] Figure 3 This is a schematic diagram of the disassembled structure of this utility model;
[0030] Figure 4 This is a schematic diagram of the disassembled structure of the power cable unit of this utility model.
[0031] The components are as follows: 1. Power cable unit; 101. Conductor 1; 102. Mica tape; 103. Insulation tape; 104. Water-blocking filler 1; 105. Flame-retardant wrapping tape; 106. Outer sheath 1; 2. Optical cable unit; 201. Optical fiber bundle tube; 202. Central reinforcement; 203. Water-blocking filler 2; 204. Water-blocking tape 1; 205. Outer sheath 2; 3. Signal control cable unit; 301. Conductor 2; 302. Insulation layer; 303. Water-blocking filler 3; 304. Water-blocking tape 2; 305. Shielding layer; 306. Water-blocking filler 4; 307. Water-blocking tape 4; 308. Outer sheath 3; 309. Core assembly; 4. Water-blocking filler 5; 5. Water-blocking tape 5; 6. Fire-resistant layer; 7. Copper sheath; 8. Flame-retardant sheath. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] Example 1: As Figures 1-4 As shown, the present invention provides a composite cable for urban underground integrated pipe gallery, including a power cable unit 1, an optical cable unit 2, and a signal control cable unit 3. The power cable unit 1, optical cable unit 2, and signal control cable unit 3 are twisted into a cable in a clockwise direction. The gaps between the power cable unit 1, optical cable unit 2, and signal control cable unit 3 are filled with water-blocking filler 4. The water-blocking filler 4 is covered with a water-blocking tape 5. The water-blocking tape 5 is covered with a fire-resistant layer 6. The fire-resistant layer 6 is covered with a copper sheath 7. The copper sheath 7 is covered with a flame-retardant sheath 8.
[0034] The power cable unit 1 comprises conductor one 101, mica tape 102, insulation tape 103, water-blocking filling one 104, flame-retardant wrapping tape 105 and outer sheath one 106, the conductor one 101 is wrapped by the mica tape 102, the mica tape 102 is wrapped by the insulation tape 103, the mica tape 102 and the insulation tape 103 form a double-layer fireproof insulation structure, the four conductor ones 101 are filled with the water-blocking filling one 104, the water-blocking filling one 104 is wrapped by the flame-retardant wrapping tape 105, and the flame-retardant wrapping tape 105 is wrapped by the outer sheath one 106;
[0035] The optical cable unit 2 comprises optical fiber bundle tube 201, central reinforcing member 202, water-blocking filling two 203, water-blocking tape one 204 and outer sheath two 205, the five optical fiber bundle tubes 201 are provided with the central reinforcing member 202 in the center, the optical fiber bundle tube 201 and the central reinforcing member 202 are twisted into a cable, the optical fiber bundle tube 201 and the central reinforcing member 202 are filled with the water-blocking filling two 203, the water-blocking filling two 203 is wrapped by the water-blocking tape one 204, and the water-blocking tape one 204 is wrapped by the outer sheath two 205;
[0036] The signal control cable unit 3 comprises conductor two 301, insulation layer 302, water-blocking filling three 303, water-blocking tape two 304, shielding layer 305, water-blocking filling four 306, water-blocking tape four 307, outer sheath three 308 and core group 309, the conductor two 301 is wrapped by the insulation layer 302, the two conductor twos 301 are hinged and filled with the water-blocking filling three 303, the water-blocking filling three 303 is wrapped by the water-blocking tape two 304, the water-blocking tape two 304 is wrapped by the shielding layer 305, the conductor two 301, the insulation layer 302, the water-blocking filling three 303, the water-blocking tape two 304 and the shielding layer 305 form the core group 309, the three core groups 309 are arranged in a clockwise direction and the outermost layer is twisted to the right, the three core groups 309 are filled with the water-blocking filling four 306, the water-blocking filling four 306 is wrapped by the water-blocking tape four 307, and the water-blocking tape four 307 is wrapped by the outer sheath three 308.
[0037] Specifically, the conductor one 101 adopts a circular tight copper conductor, the thickness of the mica tape 102 is 0.14 mm, and the thickness of the insulation tape 103 is 1.0 mm-2.5 mm. Advantage is that the conductor one 101 adopts a circular tight copper conductor, the conductor structure is compact, and under the same conductor cross-sectional area, the outer diameter of the conductor is reduced by about 10% after being tightly pressed, thereby reducing the product outer diameter and facilitating installation and laying.
[0038] Specifically, the water-blocking filler 104 uses inorganic non-combustible expanded glass fiber rope, the flame-retardant wrapping tape 105 uses halogen-free high-flame-retardant tape, and the outer sheath 106 has a thickness of 1.5 mm. The advantages are that a double-fireproof insulation structure of mica tape 102 and insulation tape 103 is adopted, the mica tape 102 can be ensured not to be broken down within 90 minutes under the condition of 850-900℃ temperature and 600-1000V voltage environment, has stable chemical properties, excellent acid and alkali resistance, excellent aging resistance and excellent environmental protection performance, does not contain toxic and harmful ingredients, and does not produce toxic gas at high temperature, the insulation tape 103 uses ceramicized polyolefin insulation material, has the characteristics of ordinary polyolefin insulation material, and has excellent fireproof and flameproof characteristics, can form a hard ceramic shell under the burning of flame, the hard shell does not melt and drip under the fire environment (650-3000℃), and has very good heat and fire insulation effect, which can ensure the smoothness of power and communication under fire conditions, and can gain valuable time for personnel escape and fire rescue.
[0039] Specifically, the outer diameter of the optical fiber bundle tube 201 is φ2.0mm-φ2.5mm, the wall thickness is ≥0.35mm, the optical fiber bundle tube 201 has 2-12 core optical fibers per tube, the central reinforcing member 202 uses a non-metallic reinforcing member FRP, and the outer sheath two 205 uses AT electric track resistant sheath material, and the thickness of the outer sheath two 205 is 1.2mm. The advantages are that the central reinforcing member 202 uses a non-metallic reinforcing member FRP, which improves the strength of the optical cable unit 2.
[0040] Example two: as shown in the following figure, which is an improvement on the previous example. Figures 2-4
[0041] Specifically, the conductor two 301 uses oxygen-free copper wire with a specification of 0.5mm²-4mm², the insulation layer 302 uses extruded ceramicized polyolefin insulation material, and the shielding layer 305 uses 0.05mm polyester tape overlapping wrapped two layers and 0.1mm thick copper-plastic composite tape. The advantages are that the insulation layer 302 uses extruded ceramicized polyolefin insulation material with a volume resistivity of ≥2×1015Ω·cm. The crust forms quickly and is hard; under the condition of 350-1600℃ with flame and without flame, it can be burned into a hard shell body, the higher the temperature and the longer the time, the harder the ceramic shell after burning, the residue is pure ceramic inorganic matter, the ceramic shell can form a dense honeycomb-like fine pore in the process of ablation, and a layer of "porcelain enamel" film can be formed on the surface, which can have good fireproof, fireproof, heat insulation and temperature insulation effects, and the shielding layer 305 can shield the electromagnetic interference received by the communication line core.
[0042] Specifically, the fireproof layer 6 adopts ceramic polyolefin material, and the copper sheath 7 is a corrugated copper strip sheath made by argon arc welding. The advantages are that the fireproof layer 6 adopts ceramic polyolefin material, which can self-extinguish and not spread when burning horizontally, and the oxygen index is greater than or equal to 35; under the condition of flame and flameless at 350-1600 DEG C, it does not melt, drip, fall off, and cause secondary fire, and can be burned into a hard ceramic armor, the higher the temperature and the longer the time, the harder the ceramic armor after burning, the residual amount is greater than 80%, the ceramic armor can form a honeycomb ceramic fine pore, which can play a good fireproof and heat insulation effect, and the excellent flame retardance can also play a good fireproof role, the copper sheath 7 is a corrugated copper strip sheath made by argon arc welding, which can improve the mechanical properties of the cable, enhance the impact resistance, and make the cable have good bending performance, the argon arc welding makes the metal sheath form a sealed environment, so that the cable has good waterproof performance, and can also prevent corrosion and insect bites, and can effectively protect the internal insulation of the cable core under the damage of the outer sheath, so that the cable can operate normally; the copper sheath 7 can play a shielding role, effectively shield external electromagnetic interference, and play a total shielding role.
[0043] Specifically, the thickness of the flame-retardant sheath 8 is 2-4 mm, and the flame-retardant sheath 8 adopts B1-grade flame-retardant low-smoke halogen-free sheath material with special termite prevention agent and additive. The advantages are that the flame-retardant sheath 8 adopts B1-grade flame-retardant low-smoke halogen-free sheath material with special termite prevention agent and additive, which can prevent the growth of mold and aquatic parasites for a long time, effectively prevent termite bites, has excellent corrosion resistance and corrosion resistance, and plays a protective role.
[0044] Working principle: the composite cable for the urban underground comprehensive pipe gallery has information control, network interconnection and power transmission functions, adopts a composite structure, combines different functional products together, reduces the cable laying cost, can realize the upper end connection of power optical fiber to the house and power line monitoring, early warning and other functions synchronously, improves the fault reaction speed, and reduces the line maintenance cost; has excellent fire resistance: the cable is not broken under the rated working voltage, the flame temperature is not less than 750 DEG C, and the fuse is not broken within 90 min of fire supply time; the reasonable structure and the selection of suitable fireproof material meet the needs of cable fire resistance, consider material selection, structure size and electrical performance, and also achieve the purpose of reducing cost; no heavy metal, non-toxic and odorless, no influence on human body and environment; ant termite, rat bite, waterproof and oil resistant.
[0045] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A composite cable for urban underground utility tunnels, comprising a power cable unit (1), an optical cable unit (2), and a signal control cable unit (3), characterized in that: The power cable unit (1), optical cable unit (2) and signal control cable unit (3) are twisted into a cable in a clockwise direction. The gaps between the power cable unit (1), optical cable unit (2) and signal control cable unit (3) are filled with water-blocking filler five (4). The water-blocking filler five (4) is covered with water-blocking tape five (5). The water-blocking tape five (5) is covered with a fire-resistant layer (6). The fire-resistant layer (6) is covered with a copper sheath (7). The copper sheath (7) is covered with a flame-retardant sheath (8). The power cable unit (1) includes a conductor (101), a mica tape (102), an insulating tape (103), a water-blocking filler (104), a flame-retardant wrapping tape (105), and an outer sheath (106). The conductor (101) is covered with a mica tape (102), and the mica tape (102) is covered with an insulating tape (103). The mica tape (102) and the insulating tape (103) form a double-layer fireproof insulation structure. The gaps between the four conductors (101) are filled with a water-blocking filler (104). The water-blocking filler (104) is covered with a flame-retardant wrapping tape (105), and the flame-retardant wrapping tape (105) is covered with an outer sheath (106). The optical cable unit (2) includes an optical fiber bundle tube (201), a central reinforcement member (202), a water-blocking filler (203), a water-blocking tape (204), and an outer sheath (205). The five optical fiber bundle tubes (201) are provided with a central reinforcement member (202) at their center. The optical fiber bundle tubes (201) and the central reinforcement member (202) are twisted together to form a cable. The hollow of the optical fiber bundle tubes (201) and the central reinforcement member (202) is filled with the water-blocking filler (203). The water-blocking filler (203) is covered with the water-blocking tape (204), and the water-blocking tape (204) is covered with the outer sheath (205). The signal control cable unit (3) includes conductor two (301), insulation layer (302), water-blocking filler three (303), water-blocking tape two (304), shielding layer (305), water-blocking filler four (306), water-blocking tape four (307), outer sheath three (308), and core group (309). The conductor two (301) is covered with insulation layer (302). Two conductors two (301) are hinged together and the gap is filled with water-blocking filler three (303). The water-blocking filler three (303) is covered with water-blocking tape two (304). 304) The outer side is covered with a shielding layer (305). The conductor two (301), the insulation layer (302), the water-blocking filler three (303), the water-blocking tape two (304), and the shielding layer (305) form a core group (309). The three core groups (309) are arranged in a clockwise direction and the outermost layer is twisted to the right. The gaps between the three core groups (309) are filled with water-blocking filler four (306). The water-blocking filler four (306) is covered with water-blocking tape four (307) on the outside. The water-blocking tape four (307) is covered with outer sheath three (308) on the outside.
2. The composite cable for urban underground utility tunnels according to claim 1, characterized in that: The conductor (101) is a circular compacted copper conductor, the mica tape (102) has a thickness of 0.14 mm, and the insulating tape (103) has a thickness of 1.0 mm to 2.5 mm.
3. The composite cable for urban underground utility tunnels according to claim 1, characterized in that: The water-blocking filler (104) is made of inorganic non-combustible expanded glass fiber rope, the flame-retardant wrapping tape (105) is made of halogen-free high flame-retardant tape, and the outer sheath (106) is 1.5 mm thick.
4. The composite cable for urban underground utility tunnels according to claim 1, characterized in that: The outer diameter of the fiber optic bundle tube (201) is φ2.0mm~φ2.5mm, and the wall thickness is ≥0.35mm. Each fiber optic bundle tube (201) contains 2 to 12 optical fibers. The central reinforcing member (202) is made of non-metallic reinforcing member FRP. The outer sheath (205) is made of AT anti-tracking sheath material and the thickness of the outer sheath (205) is 1.2mm.
5. A composite cable for urban underground utility tunnels according to claim 1, characterized in that: The conductor 2 (301) uses oxygen-free copper wire with a specification of 0.5mm² to 4mm², the insulation layer (302) uses extruded ceramicized polyolefin insulation material, and the shielding layer (305) uses two layers of 0.05mm polyester tape wrapped together and wrapped with 0.1mm thick copper-plastic composite tape.
6. The composite cable for urban underground utility tunnels according to claim 1, characterized in that: The refractory layer (6) is made of ceramicized polyolefin material, and the copper sheath (7) is a corrugated copper strip sheath made by argon arc welding.
7. The composite cable for urban underground utility tunnels according to claim 1, characterized in that: The thickness of the flame-retardant sheath (8) is 2mm to 4mm.