WO2020191984A1

WO2020191984A1 - Anti-icing and de-icing hot-extruding polyethylene parallel steel wire cable system and preparation method therefor

Info

Publication number: WO2020191984A1
Application number: PCT/CN2019/099760
Authority: WO
Inventors: 强强; 薛花娟; 赵军
Original assignee: 江苏法尔胜路桥科技有限公司; 江苏法尔胜缆索有限公司
Priority date: 2019-03-26
Filing date: 2019-08-08
Publication date: 2020-10-01
Also published as: CN110004828A

Abstract

An anti-icing and de-icing hot-extruding polyethylene parallel steel wire cable system, comprising a cable, connection cylinders (2), anchor cups (1), wire separation plates (7) and locking nuts (8), the connection cylinders (2) being provided at front ends of the anchor cups (1), the wire separation plates (7) being provided inside the anchor cups (1), and the locking nuts (8) being locked on the outer periphery of the anchor cups (1). The cable comprises a bare cable and a sheath (9) wrapping the outer layer of the bare cable, the bare cable is further composed of parallel steel wire bundles (5) and several full-length heating wires (4), and the steel wire bundles (5) of the bare cable pass through the connection cylinders (2) and are anchored within the anchor cups (1). The ends of steel wires are fixed on the wire separation plates (7), several hollow penetrating pipes (3) are anchored within the anchor cups (1), rear ends of the penetrating pipes (3) pass through the wire separation plates (7), front ends of the penetrating pipes extend forward to the connection cylinders (2), the heating wires (4) of the bare cable pass through the penetrating pipes (3) in one-to-one correspondence and are drawn out from the wire separation plates (7), the heating wires (4) can be drawn out from the anchor cups (1), and in a state where the drawn heating wires (4) are connected to a power source, the heating wires (4) heat the cable. The heating wires (4) are provided on the outer periphery of the parallel steel wire bundles (5) to heat the cable upon being energized, achieving the effects of anti-icing and de-icing.

Description

Anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system and preparation method thereof

Technical field

The invention relates to a cable-stayed bridge structure, in particular to a parallel steel wire cable system that can be energized and heated.

Background technique

With the rapid progress of modern science and technology, new materials have been developed and applied, and construction methods have been improved and perfected, especially the rapid development of computer technology and finite element analysis methods, as well as breakthroughs in analytical theories, which have made bridges more and more capable of spanning The stronger, the long-span bridges represented by cable-stayed bridges and suspension bridge systems have sprung up and achieved rapid development. The span of the suspension bridge is close to 2,000 meters. For example, the main span of the Great Belt Bridge in Denmark is 1,624 meters, and the main span of Akashi Kaikyo Bridge in Japan is 1,990 meters. The cable-stayed bridge has a span of more than 1,000 meters. Among the cable-stayed bridges, the Japanese Dodola Bridge has a span of 890 meters, the Sutong Yangtze River Bridge has a span of 1088 meters, and the Hutong Yangtze River Bridge has a main span of 1092 meters. The span of the arch bridge also reaches the order of 550 meters. Suspension bridges and cable-stayed bridges transfer loads through a cable system, and half-through and through-type arch bridges also require suspension rods to transfer the main load of the main girder. The safety of the cable bearing system is directly related to the overall safety of the bridge structure. Therefore, ensuring the safety of the cable load-bearing system of long-span cable bridges is a key link in the bridge construction process and is of great significance.

For the stay cables of bridges in cold regions, the surface is prone to icing, which will cause the center of gravity of the stay cables to deviate from the central axis and become unstable aerodynamic shapes. In addition, the frozen ice cubes fall under the action of vibration, which can easily damage pedestrians and cars, and bring safety hazards to the operation of the bridge. Finally, in an extremely cold environment, the polyethylene sheath of the stay cable is prone to low-temperature embrittlement and cracks in a vibration environment.

To solve the above problems, it is necessary to develop an anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system to prevent the stay cable from freezing in a cold environment. At the same time, the present invention has certain positive significance for preventing low-temperature cracking of the high-density polyethylene sheath of the stay cable in the extremely cold environment.

Summary of the invention

The technical problem to be solved by the present invention is to provide a cable system with a heating wire in view of the above-mentioned prior art. The heating wire is connected to electricity to heat the usual cable to produce anti-icing and deicing effects.

The technical solution adopted by the present invention to solve the above-mentioned problems is: an anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system, which includes a cable, a connecting tube, an anchor cup, a wire dividing plate, and a lock nut. The connecting cylinder is arranged at the front end of the anchor cup, the wire dividing plate is arranged inside the anchor cup, the locking nut is locked on the outer periphery of the anchor cup, and the pull cable includes a bare cable and a sheath covering the outer layer of the bare cable The bare cable is composed of parallel steel wire bundles and a number of heating wires arranged in a full length. The steel wire bundles of the bare cable pass through the connecting cylinder and are anchored in the anchor cup. The ends of the steel wires are fixed on the wire dividing plate. The inner anchor inherently has several hollow threaded pipes. The rear end of the threaded tube passes through the wire dividing plate, and the front end extends forward to the connecting cylinder. The heating wires of the bare cable pass through the threaded tube one by one and are led out from the wire dividing plate. The heating wire can be drawn from the anchor cup, and when the drawn heating wire is connected to the power source, the heating wire generates heat and heats the cable.

A temporary wire retaining plate is arranged in the anchor cup, and the wire retaining plate blocks the heating wire passing through the wire dividing plate in the anchor cup to prevent damage to the exposed heating wire caused by the installation operation of the on-site stay cable.

Preferably, a plurality of heating wires are evenly distributed on the outer circumference of the steel wire bundle, and the heating wires and the outer steel wires are located on the same circumference, so that the heating wires are not prone to convex sliding. The advantage of this arrangement is to avoid the heating wire from interfering with the wire bundle and facilitate the replacement of the heating wire and the anchoring operation of the wire bundle.

Specifically, the heating wire includes a power bus bar, an inner insulating sleeve, a heating wire, an outer insulating sleeve, a heat conduction layer, and a heating layer in order from the inside out. The heating wire is wound on the inner insulating sleeve in a long way, and the heating wire is connected to the power supply. The bus bars are connected at intervals to form a continuous and parallel energized heating section. The power bus can be two or three parallel insulated copper stranded wires to adapt to different power sockets. After the bus is energized, each parallel resistance heats up to form a continuous heating wire.

Preferably, the bare cable is wrapped around the wrapping tape, the sheath is arranged on the outer layer of the wrapping tape, and the sheath is a single-layer or multi-layer heat-extruded polyethylene layer.

Another object of the present invention is to provide a method for preparing the above-mentioned anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system. The main steps are as follows

(1) Prepare the steel wire and heating wire according to the cable specification, and release the steel wire. During the wire feeding process, set the heating wire on the outer layer of the wire bundle. The heating wire should be evenly distributed on the outer layer of the wire bundle. When setting the heating wire, the heating wire Set in the circumference where the outer steel wire is located and closely arranged with the steel wire, with a length reserved at both ends of the heating wire;

(2) Wrap the wrapped tape around the outer circumference of the formed bare cable. Set protective covers at both ends of the bare cable. Insert the reserved heating wire and both ends of the wire bundle into the protective cover. Wrapping tape or waterproof can be further used. The belt wraps the reserved heating wire; then heat extrudes the polyethylene sheath on the surface of the shaped bare cable, the polyethylene sheath is single or multiple layers, and the polyethylene sheath also covers the protective sheath;

(3) Before cutting the cable, first strip off the polyethylene sheath at both ends, remove the protective cover to expose the heating wire and the end wire bundle, pull the heating wire backward and temporarily fix it to the cable body, Eliminate the anchoring interference to the end steel wire and comb the wire bundle;

(4) Prepare the connecting cylinder, anchor cup, and splitting plate, connect the connecting cylinder and the anchor cup, set the splitting plate into the anchor cup, and pass the wires through the connecting cylinder, anchor cup and splitting plate one by one. The wire hole will reduce the excess steel wire and put the steel wire at the head. After all the steel wires are threaded, take the hollow threaded tube, and pass the threaded tube through the wire dividing plate, anchor cup and connecting tube one by one, and pass through the rear end of the tube. It is exposed outside the wire dividing plate, and the front end is exposed on the connecting cylinder. The number and distribution of the pipes should be consistent with the number and distribution of the heating wires;

(5) Pour the anchoring material into the anchor cup for anchoring. After the anchoring is completed, pass the heating wire through the pipe one by one, and pull all the reserved heating wires outside the wire dividing plate;

(6) Then temporarily set a wire stopper on the outside of the wire dividing plate, and the wire stopper isolates the reserved heating wire within the tension thread of the anchor cup to prevent damage to the heating wire during tension;

(7) After the cable is installed and tensioned on site, remove the wire shield, and connect the heating wire from the anchor cup to the power supply. When the power is on, the heating wire will heat the surface temperature of the cable to reach the The purpose of ice and anti-icing.

Preferably, an outer temperature sensor is provided on the sheath of the cable, and an inner temperature sensor is provided on the surface of the bare cable to separately monitor the temperature of the surface of the cable and the surface of the bare cable to prevent excessive heating.

Preferably, an explosion-proof thermostat is installed at the power supply end to avoid fire.

Preferably, the piercing tube is a hollow stainless steel tube, the wall thickness of the piercing tube is 0.2-0.5mm, the length of the threading plate exposed through the tube is 2±1cm, and the length of the exposed connecting cylinder is 5±1cm, which is beneficial for adding The threading operation of the hot wire can effectively prevent the heating wire from spreading.

Preferably, in step (2), the heating wire reserved at both ends of the bare cable is wound with a wrapping tape so as not to be exposed to protect the heating wire.

Compared with the prior art, the present invention has the advantage of providing an anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system. The heating wire is arranged on the periphery of the parallel steel wire bundle, and the cable is energized. Heating can prevent icing and deicing.

Description of the drawings

Figure 1 is a schematic structural diagram of a cable system according to an embodiment of the present invention;

2 is a schematic diagram of the structure of the cable system of the embodiment of the present invention after being installed as a stay cable;

Figure 3 is a schematic diagram of the structure of a dual-core heating wire in an embodiment of the present invention;

4 is a schematic diagram of the structure of a three-core heating wire in an embodiment of the present invention;

Figure 5 is a cross-sectional view of the bare cable of 3 heating wires;

Figure 6 is a cross-sectional view of the bare cable of 6 heating wires;

Figure 7 is a cross-sectional view of the bare cable of 12 heating wires;

Figure 8 is a schematic diagram of the structure before the cable body is anchored;

Figure 9 is a schematic diagram of the structure of the anchor cup before anchoring;

Figure 10 is a schematic diagram of the structure of the anchor cup after grouting;

Figure 11 is a schematic diagram of the side of the wire dividing plate after anchoring;

Figure 12 is a structural schematic diagram of installing the wire retaining plate in the anchor cup before tensioning;

Figure 13 is a schematic diagram of the structure of the heating wire leading to electricity after the stay cable is erected.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

Example 1

As shown in Figures 1-7, this embodiment relates to an anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system, including a cable, a connecting tube 2, an anchor cup 1, a wire dividing plate 7, and a lock nut 8. , The connecting cylinder 3 is arranged at the front end of the anchor cup 1, the connecting cylinder and the cable surface are connected by a guard ring sealingly, the wire dividing plate 7 is arranged inside the anchor cup 1, and the locking nut 8 is locked on the outer periphery of the anchor cup 1. The cable includes bare Cable, a single-layer or double-layer polyethylene sheath 9 covered on the outer layer of the bare cable. The bare cable is then composed of parallel steel wire bundles 5 and a number of heating wires 4 arranged in a full length. The heating wires are evenly distributed on the outer circumference of the steel wire bundle. , The heating wire and the outer steel wire are located on the same circumference, and the outer circumference of the bare cable is wrapped with 12 tapes to shape. The heating wire is installed when the steel wire is placed. Usually 3/6/12 heating wires are evenly arranged in the circumferential direction of the outer coil of the wire bundle, which depends on the cable specification, see Figure 5-7.

The wire bundle of the bare cable passes through the connecting cylinder 2 and is anchored in the anchor cup 1. The end of the wire is fixed on the wire dividing plate after the pier. The wire bundle in the anchor cup is in a conical shape, and the anchor cup 1 is anchored There are a number of hollow threaded tubes 3, the rear end of the threaded tube 3 passes through the wire dividing plate 7, and the front end extends forward from the connecting cylinder 2. The heating wires of the bare cable pass through the threaded tube 3 one by one from the front to the back and from the wire dividing plate 7. Lead out, temporarily install a wire retaining plate 6 in the anchor cup 1 before installing the stay cable. The wire retaining plate 6 hides the heating wire that extends beyond the wire splitting plate in the anchor cup 1 so that it is not exposed and damaged. After the stay cable is installed on site, remove the wire retaining plate 6 and lead the heating wire 4 out of the anchor cup 1. When the lead wire is connected to the power supply, the heating wire can generate heat and heat the cable as a whole.

Hollow stainless steel pipe is selected for the above-mentioned piercing tube 3, the wall thickness of the piercing tube is 0.2-0.5mm, the length of the threading plate exposed through the tube is 2±1cm, and the length of the exposed connecting cylinder is 5±1cm.

The heating wire includes the power bus bar (including the power core wire 401 and the core wire insulation layer 401'), the inner insulating sleeve 402, the heating wire 403, the outer insulating sleeve 404, the thermal conductive layer (braided layer) 405 and the heating layer 406 in turn from the inside out. Wherein, the heating wire 403 is wound on the inner insulating sleeve 402 in a full length, and the heating wire 403 is connected with the power bus 401 at intervals to form a continuous and parallel energized heating section. The power cord can be two-core or three-core. The heating wire can be arbitrarily cut to length according to actual needs on site, and the braided layer 405 plays a role of heat conduction, and helps to improve the strength of the heating wire, and can also be used as a safety ground wire.

Example 2

With reference to Figures 8-13, this example is to disclose the preparation method of the cable system in Example 1. Taking the cable with 6 heating wires as an example, the steps are as follows

1. Prepare the wire bundle and six heating wires, and release the wires. The cross section of the wire bundle is a regular hexagon. During the wire laying process, a heating wire is set on the outer layer of the wire bundle. The six heating wires are evenly arranged on the outer ring of the wire bundle, and the heating wire is set At the time, the heating wire and the outer steel wire should be arranged side by side and closely arranged with the steel wire, and sufficient length should be reserved at both ends of the heating wire;

2. Wrap the wrapping tape around the outer circumference of the bare cable to shape, install a temperature sensor on the surface of the bare cable during the winding process, comb the heating wires reserved at both ends into a group and wrap it tightly with wrapping tape, and set metal at both ends of the bare cable Protective sheath, insert the reserved heating wire and both ends of the steel wire bundle into the protective sheath; then heat extrude the high-density polyethylene sheath on the surface of the shaped bare cable. The high-density polyethylene sheath has two layers, and the polyethylene sheath The cover also covers the protective cover;

3. Before cutting the cable, first strip off the polyethylene sheath at both ends, remove the protective sheath, and peel off the wrapping tape on the heating wire to expose the heating wire and the end wire bundle, and pull the heating wire backwards. And temporarily fix it to the cable body, see Figure 9, to prevent the heating wire from interfering with the end wires, and then comb the end wire bundles to spread the parallel wires;

4. Prepare the connecting tube, anchor cup, wire dividing plate and wire retaining plate, connect the connecting tube to the anchor cup, set the wire dividing plate into the anchor cup, and pass the wires through the connecting tube, anchor cup and wire dividing plate one by one Remove the excess wires on the upper wire hole, fix the wire pier head on the wire dividing plate, after all the wires are threaded, take six hollow pipes, and pass the pipes through the wire dividing plate and anchor one by one. For the cup and the connecting cylinder, the rear end of the threading tube is exposed outside the wire dividing plate, and the front end is exposed on the connecting tube. The distribution position of the threading tube should be consistent with the distribution position of the heating wire on the wire bundle;

5. Pour the anchoring material into the anchor cup for anchoring. After the anchoring is completed, pass the heating wire through the pipe one by one, and pull all the reserved heating wires outside the wire dividing plate;

6. Then temporarily set a wire stopper on the outside of the wire dividing plate. The wire stopper isolates the reserved heating wire within the tension thread on the anchor cup to prevent damage to the heating wire during tension;

7. Transport the cable to the construction site, install the stay cable, set a temperature sensor on the polyethylene sheath of the cable, and after the cable is installed and tensioned on site, remove the wire retaining plate and remove the heating wire from the anchor The inside of the cup is connected to the power supply, and an explosion-proof thermostat is installed at the power supply end. The heating wire is energized and generates heat to heat the cable to achieve the purpose of deicing and anti-icing.

In addition to the foregoing embodiments, the present invention also includes other implementation modes, and all technical solutions formed by equivalent transformations or equivalent substitutions shall fall within the protection scope of the claims of the present invention.

Claims

An anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system, comprising a cable, a connecting tube, an anchor cup, a wire dividing plate, and a lock nut. The connecting tube is arranged at the front end of the anchor cup, and the splitting The wire plate is arranged inside the anchor cup, and the lock nut is locked on the outer periphery of the anchor cup. It is characterized in that: the pull cable includes a bare cable, a sheath covering the outer layer of the bare cable, and the bare cable is made of parallel steel wires. The wire bundle of the bare cable passes through the connecting cylinder and is anchored in the anchor cup, the end of the wire is fixed on the wire dividing plate, and the anchor cup is anchored by a number of hollow through pipes. , The rear end of the threading tube passes through the wire dividing plate, and the front end extends forward to the connecting cylinder. The heating wires of the bare cable pass through the threading tube one by one and are led out from the wire separating plate, and the heating wires can be drawn from the anchor cup , In the state that the drawn heating wire is connected to the power source, the heating wire generates heat and heats the cable.
The anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 1, characterized in that: the anchor cup is provided with a temporary wire retaining plate, which will pass through the wire dividing plate The heating wire is blocked in the anchor cup.
The anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 1, wherein a plurality of heating wires are evenly distributed on the outer circumference of the steel wire bundle, and the heating wires and the outer steel wires are located on the same circumference.
The anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 1, wherein the heating wire includes a power bus bar, an inner insulation sleeve, a heating wire, and an outer insulation in order from the inside out. The heating wire is wound on the inner insulating sleeve in a long length, and the heating wire is connected to the power bus bar at intervals to form a continuous and parallel energized heating section.
The anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 1, wherein the bare cable is wound with a wrapping tape, the sheath is arranged on the outer layer of the wrapping tape, and The sheath is a single-layer or multi-layer heat-extruded polyethylene layer.
A method for preparing the anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to any one of claims 1 to 5, characterized in that:

(1) Prepare the steel wire and heating wire according to the cable specification, and release the steel wire. During the wire feeding process, set the heating wire on the outer layer of the wire bundle. The heating wire should be evenly distributed on the outer layer of the wire bundle. When setting the heating wire, the heating wire Set in the circumference where the outer steel wire is located and closely arranged with the steel wire, with a length reserved at both ends of the heating wire;

(2) Wrap a wrapping tape around the outer circumference of the formed bare cable, set a protective cover at both ends of the bare cable, and stuff the reserved heating wire and both ends of the wire bundle into the protective cover; then heat the surface of the formed bare cable Extruded polyethylene sheath, the polyethylene sheath is a single layer or multiple layers, and the polyethylene sheath also covers the protective cover;

(3) Before cutting the cable, first strip off the polyethylene sheath at both ends, remove the protective cover to expose the heating wire and the end wire bundle, pull the heating wire backward and temporarily fix it to the cable body, Eliminate the anchoring interference to the end wires, comb the wire bundles to spread the parallel wires;

(4) Prepare the connecting cylinder, anchor cup, and splitting plate, connect the connecting cylinder and the anchor cup, set the splitting plate into the anchor cup, and pass the wires through the connecting cylinder, anchor cup and splitting plate one by one. After all the wires are threaded, take the hollow threaded tube and pass the threaded tube through the wire splitting plate, anchor cup and connecting tube one by one, and the rear end of the threaded tube is exposed Outside the wire dividing plate, the front end is exposed on the connecting cylinder, and the number and distribution of the pipes should be consistent with the number and distribution of the heating wires;

(5) Pour the anchoring material into the anchor cup for anchoring. After the anchoring is completed, pass the heating wire through the pipe one by one, and pull all the reserved heating wires outside the wire dividing plate;

(6) Then temporarily set a wire stopper on the outside of the wire dividing plate, the wire stopper isolates the reserved heating wire within the tension thread of the anchor cup to prevent damage to the heating wire during tension;

(7) After the cable is installed and tensioned on site, remove the wire shield, and connect the heating wire from the anchor cup to the power supply. When the power is on, the heating wire will heat the surface temperature of the cable to reach the The purpose of ice and anti-icing.
The method for preparing an anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 6, wherein an outer temperature sensor is arranged on the sheath of the cable, and the inner temperature is set on the surface of the bare cable. sensor.
The method for preparing the anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 6, wherein an explosion-proof thermostat is installed at the power source.
The method for preparing the anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 6, wherein the penetrating pipe is a hollow stainless steel pipe, and the wall thickness of the penetrating pipe is 0.2-0.5 mm, the length of the threading plate exposed through the tube is 2±1cm, and the length of the exposed connecting cylinder is 5±1cm.
The method for preparing the anti-icing and deicing hot-extruded polyethylene parallel steel wire cable system according to claim 6, characterized in that: in step (2), a wrapping tape is used to reserve both ends of the bare cable The heating wire is twisted so that it is not exposed.