Simple layer structure waterproof cable for bridge

Abstract

The invention belongs to the technical field of cables for bridges, and particularly relates to a simple layer structure waterproof cable for bridges, which comprises more than one conductor wire core, each conductor wire core is coaxially coated with an insulating layer, and each insulating layer is uniformly wrapped with an aluminum-plastic composite tape, so that a waterproof shielding layer which is coaxially and tightly coated on the insulating layer is formed. Wherein the aluminum-plastic composite belts are overlapped and wrapped on the insulating layer circle by circle along the axial direction of the insulating layer, the overlapped parts between two adjacent circles of aluminum-plastic composite belts on the insulating layer are also thermally compounded together, and meanwhile, the overlapped parts between the aluminum-plastic composite belts and the insulating layer are also thermally compounded together. All the conductor wire cores coated with the insulating layers and the waterproof shielding layers are twisted together to form a whole body and are tightly coated with a non-woven fabric layer, and the non-woven fabric layer is coaxially coated with a sheath layer.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables for bridges, and particularly relates to a simple-layer structure waterproof cable for bridges. Background Art

[0002] There are multiple electrical equipment distributed on modern bridges, such as street lamps, hanging lamps, signal lamps, monitoring probes, etc. Therefore, cables for power transmission need to be arranged on the bridges so that electrical energy can be transmitted thereto. Bridges are exposed to the outside, so the cables on the bridges will inevitably be eroded by rainwater from time to time; in addition, there is a river under the bridge. Especially in summer, the river water evaporates and rises after being heated, which will also continuously erode and penetrate the cables on the bridge. Therefore, the cables used in bridge construction have relatively high requirements for waterproof performance.

[0003] The aluminum-plastic composite tape is a composite material tape composed of an aluminum foil and a plastic film. When the aluminum-plastic composite tape is used as a shielding layer in a cable, in addition to effectively isolating electromagnetic interference and preventing external electromagnetic waves from affecting the normal operation of the cable, due to the dense material of the aluminum foil layer, it can also isolate oxygen and moisture and prevent the cable from being corroded. However, the aluminum-plastic composite tape is wound around the surface of the cable insulation layer. The aluminum-plastic composite tape is wound around the cable turn by turn along the length direction of the cable. Among them, there are small gaps between the overlapping parts of adjacent two turns of the aluminum-plastic composite tape, and oxygen and moisture can still enter the inside of the aluminum-plastic composite tape through these small gaps, posing a hidden danger to the waterproof performance of the cable. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a simple-layer structure waterproof cable for bridges, which includes more than one conductor core. Each conductor core is coaxially coated with an insulation layer, and an aluminum-plastic composite tape is evenly wound around each insulation layer to form a waterproof shielding layer that is coaxially and tightly coated on the insulation layer. Among them, the aluminum-plastic composite tape is wound around the insulation layer in an overlapping manner turn by turn along the axial direction of the insulation layer. The overlapping parts between adjacent two turns of the aluminum-plastic composite tape on the insulation layer are also thermally compounded with each other, and at the same time, the overlapping contact parts between the aluminum-plastic composite tape and the insulation layer are also thermally compounded.

[0005] All the conductor cores coated with the insulation layer and the waterproof shielding layer are stranded together as a whole and are tightly coated by a non-woven fabric layer. A sheath layer is coaxially coated outside the non-woven fabric layer.

[0006] Preferably: Inside the non-woven fabric layer, the gaps between the conductor cores coated with the insulation layer and the waterproof shielding layer are filled with filling ropes.

[0007] Preferably, when the aluminum-plastic composite tape is wrapped around the insulating layer in overlapping circles along the axial direction of the insulating layer, the aluminum-plastic composite tape is first unwound from the aluminum-plastic composite tape unwinding roller in a tensioned state along its own length direction, then heated in an oven, and then wrapped around the insulating layer.

[0008] Among them, the width of the aluminum-plastic composite tape is 15mm to 30mm.

[0009] In the aluminum-plastic composite tape, the aluminum foil base layer is on the inside and the plastic film layers (PE film) are on the outside on both sides. The thickness of the aluminum foil base layer is 0.1mm~0.2mm, and the thickness of the plastic film layers (PE film) composited on the two surfaces of the aluminum foil base layer is 0.05mm~0.06mm.

[0010] The tensioning force of the aluminum-plastic composite tape in the tensioned state is 0.5N~1N along its length direction, and the temperature of the oven is 140℃~160℃. Under such parameters, it can be ensured that the overlapping parts of the two adjacent circles of aluminum-plastic composite tape wrapped around the insulating layer are stably thermally composited with each other, and the aluminum-plastic composite tape and the insulating layer (the contact area) are also stably thermally composited with each other.

[0011] As a preferred embodiment, the mechanism for wrapping the aluminum-plastic composite tape comprises a fixed turntable coaxially arranged with the conductor core (the surface of which is coaxially and tightly covered with an insulating layer) that is uniformly driven horizontally along its own axis. The turntable can rotate axially. The center of the turntable surface is an opening that is coaxial with the turntable and connects the two surfaces of the turntable for the conductor core to pass through.

[0012] A reel is horizontally extended outward from a vertical disk surface on one side of the turntable in parallel with the axial direction of the turntable. The aluminum-plastic composite tape is wound on the reel. The other end of the reel in the length direction can axially rotate and pass through the turntable, and is stably connected to the first drive motor fixedly installed on the other disk surface of the turntable to drive the reel to release the aluminum-plastic composite tape at a speed.

[0013] A transmission roller is arranged on the same side of the turntable as the unwinding roller and extends outward horizontally and parallel to the axial direction of the turntable. The transmission roller is fixedly installed on the turntable and can cooperate with the axial rotation on the turntable. The transmission roller is arranged on the roller surface along the radial direction of the transmission roller away from the center of the turntable. The transmission roller cooperates with the axial rotation on the turntable to slide against the aluminum-plastic composite belt and keep the belt section of the aluminum-plastic composite belt between the transmission roller and the conductor core and the belt section of the aluminum-plastic composite belt between the transmission roller and the unwinding roller in a tensioned state.

[0014] Among them, an oven is fixedly arranged on the disk surface on the same side as the unwinding roller and the transmission roller, and between the transmission roller and the unwinding roller. The oven is a strip oven. The aluminum-plastic composite tape unwound by the unwinding roller is suspended in the length direction of the strip oven in a tensioned state and passes through the strip oven to reach the transmission roller (the aluminum-plastic composite tape has no contact with the inner wall of the strip oven in a tensioned state), and then leaves the transmission roller in a tensioned state and is thermally compounded and wrapped on the insulating layer on the surface of the conductor core.

[0015] Preferably: the turntable is a geared disk with a vertical disk surface, a driving geared disk which is fixed in position and can rotate axially is installed on the top of the turntable, the disk surface of the driving geared disk is vertical and the axial direction is parallel to the axial direction of the turntable, the driving geared disk and the turntable are meshing, a second driving motor is fixedly installed on one side of the driving geared disk, the driving geared disk is connected to the second driving motor by driving, and the driving geared disk is driven axially by the second driving motor to synchronously drive the turntable to rotate axially.

[0016] The second driving motor is fixedly mounted on the fixed frame, and the driving gear plate and the rotating plate are fixedly mounted on the fixed frame so as to be axially rotatable (the fixed frame is not shown in the attached figure).

[0017] Based on the above-mentioned wrapping mechanism, at the beginning of wrapping, the transmission of the cable core remains stopped. At this time, one end of the aluminum-plastic composite tape in the length direction is manually pulled out from the unwinding roller and passed through the strip oven. After passing through the transmission roller, the end of the aluminum-plastic composite tape is pulled and tightened with a tensile gauge to keep the tension of the aluminum-plastic composite tape along its own length direction (the specific tension is as recorded above and monitored by the above-mentioned tensile gauge) unchanged, and the released aluminum-plastic composite tape is partially pressed against the conductor core (outer insulation layer) and does not move, as shown in the attached Figure 2 (During this process, the first drive motor cooperates to drive the unwinding roller to rotate axially to release the corresponding length of aluminum-plastic composite tape.) At this time, the conductor core transmission is turned on at the same time, the second drive motor drives the turntable to rotate axially through the drive gear plate for winding, and the first drive motor drives the unwinding roller to cooperate with unwinding, and the strip oven is turned on for heating at the same time. After winding a sufficient number of turns, it can be considered that under the above-mentioned tension, there must be several turns of the aluminum-plastic composite tape that are thermally composited and stable with the insulation layer. At this time, the tensiometer is removed (before that, the reading of the tensiometer must be controlled to remain basically unchanged, even if it is slightly increased). These several turns of aluminum-plastic composite tape that are firmly thermally composited on the insulation layer cooperate with the rotation speed of the turntable (wrapping speed) and the unwinding speed of the unwinding roller, so that the aluminum-plastic composite tape that continues to be wrapped will always be wrapped under the above-mentioned tension, which also ensures the thermal composite stability effect of the aluminum-plastic composite tape that is subsequently wrapped.

[0018] Among them, by comprehensively controlling the rotation speed of the integrated control turntable, the unwinding speed of the unwinding roller, and the transmission speed of the conductor core, on the one hand, the aluminum-plastic composite tape can always be kept in a tensioned state (ensuring the thermal composite pressure) to form a uniform overlapping wrap on the conductor core, and the overlapping rate is about 10% of the width of the aluminum-plastic composite tape; on the other hand, it also takes into account that there is enough time for the aluminum-plastic composite tape to be fully heated when passing through the strip oven (ensuring the thermal composite temperature). The specific speed parameters can be adjusted during actual production.

[0019] The beneficial effects of the present invention are as follows:

[0020] Before the aluminum-plastic composite tape wraps around the conductor core, the aluminum-plastic composite tape is first heated to make the plastic films on both surfaces of the aluminum-plastic composite tape in a certain molten and softened state, and the aluminum-plastic composite tape is always kept in a tensioned state along its own wrapping direction (length direction) during the entire wrapping process, so that the aluminum-plastic composite tape wrapped on is subjected to sufficient pressure along the radial direction of the conductor core, so that the overlapping parts between two adjacent turns of the wrapped aluminum-plastic composite tape are thermally compounded with each other, and at the same time, the contact part between the aluminum-plastic composite tape and the insulating layer is also thermally compounded, that is, hermetic bonding is realized, further effectively improving the waterproof and anti-corrosion properties of the cable.

[0021] When designing this scheme, the applicant considered that the aluminum foil matrix layer in the aluminum-plastic composite tape has very ideal tensile strength (for example, the tensile strength of 8011-O aluminum strip is greater than 100 Mpa), and considering that the plastic film layer (PE film) on the surface of the aluminum foil matrix layer is very thin, the thermal composite pressure between the plastic film layers is generally only 0.4 MPa to 0.6 MPa. Therefore, due to the existence of the aluminum foil matrix layer as a support, even after heat treatment in the oven, there is no need to worry at all that the aluminum-plastic composite tape will break or deform after being tensioned during the wrapping process.

[0022] At the same time, after the aluminum-plastic composite tape in this scheme is fully unfolded in its own width direction, during the process of being transmitted from the unwinding roller through the strip oven to the transmission roller and then from the transmission roller to the insulating layer, the transmission direction is always parallel to the disk surface of the turntable; and the disk surface of the turntable is perpendicular to the transmission direction of the conductor core, so that the wrapping angle of the aluminum-plastic composite tape on the conductor core is very small, so that most of the tension force on the aluminum-plastic composite tape serves as the thermal composite pressure acting on the just-wrapped aluminum-plastic composite tape along the radial direction of the conductor core inward. This not only increases the thermal composite effect, but also avoids the reduction of the radial component force of the wrapping tension force and the increase of the axial component force due to too large a wrapping angle (after such a trade-off, the wrapping is unstable and easy to loosen under the tension force of the aluminum-plastic composite tape required in this scheme). Brief Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the layer structure of the simple layer structure waterproof cable for bridges of the present invention;

[0024] Figure 2 In the present invention, during the horizontal transmission of a conductor core with an insulating layer wrapped around its outer surface along its own axial direction, it is a schematic diagram of the device mechanism for winding an aluminum-plastic composite tape on its surface. Among them, the straight arrow represents the horizontal transmission direction of the conductor core, and the curved arrow represents the axial rotation direction of the turntable;

[0025] Figure 3 It is a schematic diagram of the structure of an unwinding roller with a limiting structure. At the same time, the transmission roller is similar in structure;

[0026] Among them, 10 - conductor core, 20 - insulating layer, 30 - aluminum-plastic composite tape, 40 - non-woven fabric layer, 50 - sheath layer, 60 - filling rope,

[0027] 1 - turntable, 2 - unwinding roller, 3 - transmission roller, 4 - strip oven, 5 - driving gear disk, 6 - first driving motor, 7 - tensiometer. Specific implementation manner

[0028] It should be noted that the words "vertical", "upright", and "horizontal" used in the description of this solution refer to the directions in the drawings, and "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. These are only for the convenience of describing this solution and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this solution.

[0029] A simple layer structure waterproof cable for bridges. During the processing, first through an extrusion operation, an insulating layer 20 (a conventional polyethylene insulating layer) is uniformly formed coaxially outside the conductor core 10 (formed by uniformly stranding a number of round copper wires), and then through the winding mechanism of this solution, an aluminum-plastic composite tape 30 is wound on the surface of the insulating layer 20 to form a waterproof shielding layer:

[0030] The wrapping mechanism includes a fixed turntable 1 (the turntable 1 is installed on a fixed frame, which is not shown in the attached drawings) and is coaxially arranged with a conductor core 10 (the surface of which is covered with the above-mentioned insulating layer 20) that is uniformly driven horizontally along its own axis. The turntable 1 can rotate axially on the above-mentioned fixed frame. The center position of the turntable 1 is an opening that is coaxial with the turntable 1 and connects the two surfaces of the turntable 1, so that the conductor core 10 can be transmitted through; the turntable 1 is a toothed disk with a vertical disk surface, and a fixed and self-rotating toothed disk is also installed on the above-mentioned fixed frame at the top of the turntable 1. The driving toothed disc 5 is axially rotatable, the surface of the driving toothed disc 5 is vertical and axially parallel to the axial direction of the turntable 1, the driving toothed disc 5 and the turntable 1 are meshing, and one side of the driving toothed disc 5 is also fixedly mounted with a second driving motor (not shown in the accompanying drawings) on the above-mentioned fixed frame, the driving toothed disc 5 is drivingly connected to the second driving motor, and the driving toothed disc 5 is driven by the second driving motor to axially rotate on the above-mentioned fixed frame to synchronously drive the turntable 1 to axially rotate, thereby realizing the wrapping of the aluminum-plastic composite tape 30 on the surface of the conductor core 10 (the surface of which is covered with an insulating layer 20).

[0031] Furthermore, a reel 2 is horizontally extended outwardly on a vertical disk surface on one side of the turntable 1 and parallel to the axial direction of the turntable 1. The aluminum-plastic composite tape 30 is evenly wound on the reel 2. The other end of the reel 2 in the length direction can axially rotate and cooperate to pass through the turntable 1, and is stably connected to the first drive motor 6 fixedly installed on the other disk surface of the turntable 1 to drive the rate at which the reel 2 releases the aluminum-plastic composite tape 30; a transmission roller 3 is horizontally extended outwardly on the disk surface of the turntable 1 on the same side as the reel 2 and parallel to the axial direction of the turntable 1. The transmission roller 3 is fixedly installed on the turntable 1 and can cooperate with axial rotation on the turntable 1. The transmission roller 3 is radially away from the center of the turntable 1 along the roller surface of the transmission roller 3. The transmission roller 3 cooperates with the axial rotation on the turntable 1 to achieve the sliding transmission of the aluminum-plastic composite tape 30; a strip oven 4 is fixedly arranged on the disk surface of the turntable 1 on the same side as the reel 2 and the transmission roller 3, and is located between the transmission roller 3 and the reel 2. The aluminum-plastic composite tape 30 unwound from the unwinding roller 2 is suspended in the longitudinal direction of the strip oven 4 in a tensioned state and then passes through the strip oven 4 to reach the transmission roller 3. Then, it leaves the transmission roller 3 in a tensioned state and is thermally composited and wrapped around the insulating layer 20 on the surface of the conductor core 10.

[0032] Among them, the unwind roller 2 and the transfer roller 3 have the same specifications. By providing a limiting structure on the unwind roller 2, slippage along the axial direction of the unwind roller 2 between the aluminum-plastic composite tape 30 wound around the unwind roller 2 and its respective wound layers is avoided. Similarly, by providing a limiting structure on the transfer roller 3, slippage of the aluminum-plastic composite tape 30 passing through the transfer roller 3 along the axial direction of the transfer roller 3 is further avoided. Through the limitation of the respective limiting structures on the unwind roller 2 and the transfer roller 3, the aluminum-plastic composite tape 30 (in a state fully unfolded in its own width direction) is unwound from the unwind roller 2, then passes through the strip oven 4 and reaches the transfer roller 3, and then is transferred from the transfer roller 3 to the insulation layer 20. During the entire process, the transfer direction of the aluminum-plastic composite tape 30 can always be parallel to the disk surface of the turntable 1.

[0033] Among them, the width of the aluminum-plastic composite tape 30 used for winding is 20 mm, and its layer structure is: an aluminum foil matrix layer on the inside and plastic film layers (PE films) on both outer sides. The aluminum foil matrix layer is 8011-O aluminum strip with a thickness of 0.15 mm; the plastic film layers (PE films) laminated on both surfaces of the aluminum foil matrix layer have a thickness of 0.05 mm each. At the beginning stage of winding, the transmission of the cable core 10 remains stopped. At this time, manually pull out one end of the aluminum-plastic composite tape 30 in the length direction from the unwind roller 2, then pass it through the strip oven 4, and then cooperate with the contact passing through the transfer roller 3. Use a tensiometer 7 to hold and tighten the end of the aluminum-plastic composite tape. When the tension force of the aluminum-plastic composite tape 30 in its own length direction is maintained at 0.7 N (converted to the tensile stress borne by the aluminum foil matrix layer in the aluminum-plastic composite tape 30 at this time, which is only about 23 Mpa, far less than the tensile strength of the aluminum foil matrix layer) and remains unchanged, place the released part of the aluminum-plastic composite tape 30 against the conductor core 10 (the insulation layer 20 outside) and keep it stationary (during this process, the first drive motor 6 cooperates to drive the unwind roller 2 to rotate axially to release the corresponding length of the aluminum-plastic composite tape 30) as shown in the appendix Figure 2 At this time, simultaneously start the horizontal transmission of the conductor core 10 (while the relative distance and relative position between the tensiometer 7 and the conductor core 10 remain unchanged and move forward horizontally with the conductor core 10), the second drive motor drives the turntable 1 to rotate axially through the drive gear disk 5 for winding, and the first drive motor 6 drives the unwind roller 2 to cooperate with unwinding, and at the same time start the heating of the strip oven 4.

[0034] Among them, the diameter of the conductor core 10 after being coated with the insulation layer 20 is about 9 mm, the transmission speed of the conductor core 10 is controlled at 2 m / min, the rotational speed of the turntable 1 rotating axially is about 110 r / min, the unwinding speed of the unwind roller 2 for the aluminum-plastic composite tape 30 is about 3.1 m / min, the strip oven 4 is in a straight strip shape with a length of 1.3 m, and the heating temperature of the strip oven 4 is 160 °C; along the transmission direction of the aluminum-plastic composite tape 30, the distance between the strip oven 4 and the transfer roller 3 is about 0.1 m, and the distance between the transfer roller 3 and the conductor core 10 to be wound is about 0.5 m.

[0035] Considering that the surfaces of the insulating layer 20 and the aluminum-plastic composite tape 30 are both relatively smooth, if the manual tension control of the aluminum-plastic composite tape 30 is released prematurely, it is easy to cause the aluminum-plastic composite tape 30 already wrapped around the surface of the insulating layer 20 to slip and displace, resulting in the subsequent aluminum-plastic composite tape 30 to be wrapped also losing the tension state. Therefore, after wrapping 22 turns (consuming the aluminum-plastic composite tape 30 that was originally between the strip oven 4 and the transmission roller 3 and between the transmission roller 3 and the conductor core 10 and not softened by heat, the same below), and then continuing to wrap 35 turns, it can be considered that under this tension force, among the latter 35 turns of the aluminum-plastic composite tape 30 wrapped on, there must be several turns that have been thermally compounded and stably combined with the insulating layer 20. At this time, the tensiometer 7 is removed, that is, the manual tension control of the aluminum-plastic composite tape 30 is released (previously, the reading of the tensiometer 7 was controlled between 0.7 N and 0.9 N. Calculated according to the tension force of 0.7 N along the length direction of the aluminum-plastic composite tape 30 during wrapping, the thermal compound pressure received by the aluminum-plastic composite tape 30 just wrapped on the insulating layer 20 on the surface of the conductor core 10 is about 0.5 Mpa), and the waterproof shielding layer is formed by continuing according to the above wrapping parameters.

[0036] After testing, the peel strength between the wrapped aluminum-plastic composite tape 30 and the insulating layer 20 reaches 3.2 N / 15 mm. (Starting from the time when the tensiometer 7 is removed, stop the machine after 15 minutes, that is, stop wrapping. Take a one-meter sample from the center of the conductor core 10 with the aluminum-plastic composite tape 30 wrapped on it, and measure the peel strength at three positions on this one-meter sample (the distance between any two adjacent measurement positions is about 0.5 meters), and take the average value, the same below).

[0037] Seven conductor cores 10 with the insulating layer 20 and the waterproof shielding layer successively coated on the surface as described above and a number of filling ropes 60 used to fill the gaps between these conductor cores 10 are assembled together in parallel (in terms of the distribution of these conductor cores 10: one is in the inner side, and six are arranged in a uniformly annular and closely surrounded manner on the outer side), and then uniformly stranded. Then, the stranded conductor cores 10 and filling ropes 60 are used as a whole and uniformly and tightly wrapped with non-woven fabric on it, thereby forming a non-woven fabric layer 40 coaxially arranged with this whole (the filling rope 60 is in a fluffy and elastic state in the natural state. During the centralized stranding and non-woven fabric wrapping process, after the filling rope 60 is squeezed, it can basically fill the inside of the non-woven fabric layer 40, including the gaps between the conductor cores 10). Then, through an extrusion operation, a sheath layer 50 (a conventional polypropylene sheath layer) is uniformly formed coaxially outside the non-woven fabric layer 40.

[0038] Comparative implementation

[0039] In the operation of winding the aluminum-plastic composite tape 30 around the conductor core 10 (with an insulating layer 20 wrapped outside), the operation in the initial stage of winding is the same as that in the foregoing specific embodiment. However, after winding 22 turns, the tensiometer 7 is removed (i.e., the manual tension control of the aluminum-plastic composite tape 30 is released). The remaining operation parameters and detection methods are the same as those in the foregoing specific embodiment.

[0040] After testing, the peel strength between the wound aluminum-plastic composite tape 30 and the insulating layer 20 only reaches 0.3 N / 15 mm, which is significantly lower than that in the foregoing specific embodiment.

[0041] This is because in the 22 turns of the wound aluminum-plastic composite tape 30, there is no thermal composite yet between the tape and the insulating layer 20, nor between the overlapping areas of adjacent wound turns of the aluminum-plastic composite tape 30. Moreover, the surfaces of both the insulating layer 20 and the aluminum-plastic composite tape 30 are relatively smooth. At this time, the manual tension control of the aluminum-plastic composite tape 30 is released, resulting in the slipping displacement of the aluminum-plastic composite tape 30 already wound on the surface of the insulating layer 20, and thus the subsequent aluminum-plastic composite tape 30 to be wound also loses its tension state. Therefore, the subsequent wound aluminum-plastic composite tape 30 can only rely on the oven heating to soften its PE film layer and then generate a certain slight adhesion with the surface of the insulating layer 20. However, there is no tension force acting as the thermal composite pressure, so the bonding effect is greatly reduced.

[0042] In the foregoing specific embodiment, after winding 22 turns and then winding 35 more turns, the manual tension control of the aluminum-plastic composite tape 30 is released. During the process of winding the subsequent 35 turns, there must be several turns of the wound layer that have been thermally composite-bonded stably with the insulating layer 20. These several turns of the wound layer are fixed to the insulating layer 20, and cooperate with the rotation speed of the turntable 1 (winding speed) and the unwinding speed of the unwinding roller 2, so that the aluminum-plastic composite tape 30 that has been unwound from the unwinding roller 2 but has not been wound yet remains in a tension state. Thus, even after the manual tension control of the aluminum-plastic composite tape 30 is released subsequently, the wound aluminum-plastic composite tape 30 is always wound under the action of the tension force, which also ensures the thermal composite stability effect of the subsequent wound aluminum-plastic composite tape 30.

Claims

1. A simple layer structure waterproof cable for bridges, characterized in that: The waterproof cable comprises more than one conductor core (10), each of the conductor cores (10) is coaxially coated with an insulating layer (20), and an aluminum-plastic composite tape (30) is evenly wrapped on each of the insulating layers (20), thereby forming a waterproof shielding layer coaxially and tightly wrapped on the insulating layer (20), wherein the aluminum-plastic composite tape (30) is wrapped around the insulating layer (20) in an overlapping manner along the axial direction of the insulating layer (20), and the overlapping portions of two adjacent turns of the aluminum-plastic composite tape (30) on the insulating layer (20) are also thermally composited with each other, and at the same time, the overlapping and contacting portions of the aluminum-plastic composite tape (30) and the insulating layer (20) are also thermally composited together. All the conductor cores (10) coated with the insulating layer (20) and the waterproof shielding layer are twisted together as a whole and tightly coated by a non-woven fabric layer (40), and the non-woven fabric layer (40) is coaxially coated with a sheath layer (50).

2. The simple layer structure waterproof cable for bridge according to claim 1, characterized in that: The gap between the conductor core (10) covered with the insulating layer (20) and the waterproof shielding layer and located inside the non-woven fabric layer (40) is filled with a filling rope (60).

3. The simple layer structure waterproof cable for bridges according to claim 1, characterized in that: When the aluminum-plastic composite tape (30) is wrapped around the insulating layer (20) in an overlapping manner along the axial direction of the insulating layer (20), the aluminum-plastic composite tape (30) is first unwound from the unwinding roller (2) in a tensioned state along its own length direction, then heated in an oven, and then wrapped around the insulating layer (20).

4. The simple layer structure waterproof cable for bridge according to claim 3, wherein: The tensioning force applied to the aluminum-plastic composite strip (30) in the tensioned state is 0.5N to 1N along its length direction, and the temperature of the oven is 140°C to 160°C.

5. The simple layer structure waterproof cable for bridge according to claim 3, characterized in that: The mechanism for wrapping the aluminum-plastic composite tape (30) comprises a fixed turntable (1) coaxially arranged with the conductor core (10) which is uniformly driven horizontally along its own axial direction, the turntable (1) being capable of self-axial rotation, and an opening which is coaxial with the turntable (1) and connects the two surfaces of the turntable (1) is arranged at the center of the turntable (1) for the conductor core (10) to pass through. The unwinding roller (2) extends outwardly and horizontally from a disk surface of one side of the turntable (1) in parallel with the axial direction of the turntable (1), and the aluminum-plastic composite strip (30) is wound on the unwinding roller (2). The other end of the unwinding roller (2) in the length direction can axially rotate and fit through the turntable (1), and is stably connected to a first drive motor (6) fixedly mounted on the other disk surface of the turntable (1) to drive the unwinding roller (2) to release the aluminum-plastic composite strip (30). A transmission roller (3) is provided on the disk surface of the turntable (1) on the same side as the unwinding roller (2) and extends outwardly and horizontally in parallel with the axial direction of the turntable (1). The transmission roller (3) is fixedly mounted on the turntable (1) and can rotate axially on the turntable (1). The surface of the transmission roller (3) is radially away from the center of the turntable (1) along the transmission roller (3). The transmission roller (3) rotates axially on the turntable (1) to slide against the aluminum-plastic composite tape (30) and keep the belt section of the aluminum-plastic composite tape (30) between the transmission roller (3) and the conductor core (10) and the belt section of the aluminum-plastic composite tape (30) between the transmission roller (3) and the unwinding roller (2) in the tensioned state.

6. The waterproof cable with a simple layer structure for a bridge according to claim 5, wherein: The rotating disk (1) is located on a disk surface on the same side as the unwinding roller (2) and the transmission roller (3); the oven fixedly arranged between the transmission roller (3) and the unwinding roller (2) is a strip oven (4); the aluminum-plastic composite tape (30) unwound by the unwinding roller (2) is suspended in the tensioned state along the length direction of the strip oven (4) and passes through the strip oven (4) to reach the transmission roller (3); and then leaves the transmission roller (3) in the tensioned state and is thermally composited and wrapped around the insulating layer (20) on the surface of the conductor core (10).

7. The simple layer structure waterproof cable for bridge according to claim 5, characterized in that: The turntable (1) is a toothed disk with a vertical disk surface. A driving toothed disk (5) which is fixed in position and can rotate axially is mounted on the top of the turntable (1). The disk surface of the driving toothed disk (5) is vertical and the axial direction is parallel to the axial direction of the turntable (1). The driving toothed disk (5) and the turntable (1) are meshingly matched. A second driving motor is fixedly mounted on one side of the driving toothed disk (5). The driving toothed disk (5) is in driving connection with the second driving motor. The driving toothed disk (5) is driven axially by the second driving motor to synchronously drive the turntable (1) to rotate axially.

8. The simple layer structure waterproof cable for bridges according to claim 5, characterized in that: The unwinding roller (2) and the transmission roller (3) have the same specifications. By providing a limiting structure on the unwinding roller (2), the aluminum-plastic composite strip (30) wound on the unwinding roller (2) and its respective winding layers are prevented from slipping along the axial direction of the unwinding roller (2). Similarly, by providing a limiting structure on the transmission roller (3), the aluminum-plastic composite strip (30) slipping and being transmitted on the transmission roller (3) is prevented from slipping along the axial direction of the transmission roller (3). By limiting the respective limiting structures on the unwinding roller (2) and the transmission roller (3), the aluminum-plastic composite strip (30) is transmitted from the unwinding roller (2) through the strip oven (4) to the transmission roller (3), and then is transmitted from the transmission roller (3) to the insulating layer (20), with the transmission direction always being parallel to the disk surface of the turntable (1).

9. The simple-layer structure waterproof cable for bridges according to claim 5, wherein: During the starting stage of wrapping, the transmission of the cable core (10) remains stopped. At this time, one end of the aluminum-plastic composite tape (30) in the length direction is pulled out from the unwinding roller (2), then passes through the oven, and after contacting and passing through the transmission roller (3), a tension meter (7) is used to hold and tighten the pulled-out end of the aluminum-plastic composite tape (30), so that when the aluminum-plastic composite tape (30) maintains a constant tension force along its own length direction, the pulled-out part of the aluminum-plastic composite tape (30) is locally abutted against the insulation layer (20) and remains stationary. At this time, the transmission of the conductor core (10), the axial rotation of the turntable (1) for wrapping, and the first drive motor (6) driving the unwinding roller (2) to cooperate with unwinding are simultaneously started, and the oven heating is also started at the same time. After wrapping enough turns, the tension meter (7) is removed.

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