A visual stay cable and its installation method

Abstract

A visual stay cable and its installation method according to the present invention include a cable body with multiple steel wires arranged therein. It further includes an inner sheath, a display light source, a temperature and humidity probe, a transparent cover plate, and an outer sheath. The multiple steel wires are arranged in the center and are wrapped by an inner sheath on the outside, and the inner sheath is wrapped by an outer sheath on the outside. Windows are provided at corresponding positions of the inner sheath and the outer sheath, and a transparent cover plate is provided in each window. A display light source and a temperature and humidity probe are provided in the window of the inner sheath. The display light source and the temperature and humidity probe are respectively connected to a power line, and the power line passes through the hot melt plastic fusion area and is led out of the cable body and connected to an external power supply. The present invention can timely collect the temperature and humidity conditions inside the stay cable, analyze the changes in temperature and humidity, timely grasp the internal conditions of the cable body, perform targeted maintenance on the stay cable, and avoid potential safety hazards caused by untimely bridge maintenance and repair plans.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge monitoring, and particularly to a visual stay cable and an installation method thereof. Background Art

[0002] In the past three decades, the bridge construction in China has developed rapidly. Cross-river and cross-sea bridges such as the Jiangyin Bridge, Sutong Bridge, Hangzhou Bay Bridge, Hong Kong-Zhuhai-Macao Bridge, Hutong Yangtze River Bridge, and Wufengshan Yangtze River Bridge that have been built and are under construction have continuously refreshed the level of China's bridge construction. Among them, the cable-stayed bridge, with its super spanning ability and excellent self-advantages, has enabled the cable-stayed bridge to move towards the direction of large spans. A cable-stayed bridge is a kind of bridge in which the main beam is directly pulled on the bridge tower by several stay cables, and it is a structural system composed of a compression-bearing tower, tensioned cables, and a bending-bearing beam body. It can be regarded as a multi-span elastic support continuous beam with stay cables replacing the piers, which can reduce the bending moment in the beam body, lower the construction height, reduce the structural weight, and save materials.

[0003] As the main component of the cable-stayed bridge, the safety of the stay cable has received widespread attention. The stay cable is exposed to the air for a long time and is eroded by wind, sun, rain, and environmental pollution. The PE protective layer on the surface of the stay cable will show varying degrees of hardening or damage, and then the internal steel wire bundle will be corroded, and in severe cases, even wire breakage will occur; on the other hand, due to factors such as wind vibration and rain vibration, the internal steel wire bundle of the stay cable generates friction, causing wire wear, and in severe cases, wire breakage will also occur. According to the actual experience at home and abroad, the corrosion of the protective layer of the stay cable and internal wire breakage are the main reasons for its damage.

[0004] The service life of the stay cable directly affects the safety life of the cable-stayed bridge. Although the stay cable adopts a sealing system with multiple protection measures such as galvanizing the stressed steel, filling with anti-rust grease, and wrapping with high-density polyethylene plastic to prevent corrosion, from the actual situation of the operation and observation of a large number of cable structure bridges, it is not completely successful. The service life of the stay cables of some bridges does not exceed 20 years, and the cable structure systems of more than 100 large-span bridges built abroad also have varying degrees of corrosion. The main reasons for the insufficient durability and safety of the stay cable, resulting in diseases and deterioration, are that the protection structure system is not perfect enough, is easily damaged or not properly protected, causing the protection of the stressed steel wires or steel strands to fail, resulting in serious corrosion, cross-sectional weakening, and bearing capacity decline. In particularly serious cases, even wire breakage occurs, completely losing the bearing capacity.

[0005] The main means for detecting stay cables of in-service bridges at present are as follows: (1) Stay cable inspection robots, mainly for visually inspecting the PE sheath of stay cables to check for any damage to the PE sheath; (2) Using guided waves or the magnetic flux leakage method to detect the corrosion or wire breakage of the stay cable wires; (3) Conducting window inspection at the lower end of the stay cable. Among the above three methods, window inspection is the most direct method, but it involves frequent opening and repair of the PE sheath of the stay cable, and the work is cumbersome. The inspection equipment for the PE sheath of stay cables is relatively mature and can better complete the inspection of the PE sheath. This method has been well applied to many bridges in China at present, but this method is for regular inspection and is not conducive to timely detection of problems. In addition, the guided wave or magnetic flux leakage method is used to detect the internal wires of the stay cable. This technology is currently in its infancy and the detection error is relatively large.

[0006] At present, the maintenance and management of bridges in China basically still rely on traditional processes and technical measures, and some aging hazards of cable-supported components and steel box girder systems cannot be detected in time, resulting in untimely bridge maintenance and repair plans. Subsequently, the damage accumulation during the bridge operation period becomes increasingly serious, and ultimately the overall condition of the bridge gradually deteriorates. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above deficiencies and provide a visual stay cable and its installation method. During the bridge construction period, some stay cables are selected, and a visual window is installed at their lower end, with a temperature and humidity sensor built in. Through the visual window, the corrosion condition of the internal wires of the stay cable can be observed at any time; at the same time, the data of the temperature and humidity sensors in the stay cable are transmitted to the monitoring center data terminal in a timely manner. By monitoring the changes in the temperature and humidity of the stay cable, the operation condition of the stay cable can be grasped in time, so as to carry out more targeted maintenance of the stay cable.

[0008] The purpose of the present invention is achieved as follows:

[0009] A visual stay cable includes a cable body with multiple wires arranged inside. It also includes an inner sheath, a display light source, a temperature and humidity probe, a transparent cover plate, and an outer sheath. The multiple wires are arranged in the center and are wrapped by an inner sheath on the outside, and the inner sheath is further wrapped by an outer sheath; corresponding positions of the inner sheath and the outer sheath are each provided with a window, and a transparent cover plate is arranged inside the window; the display light source and the temperature and humidity probe are arranged inside the window of the inner sheath, and the display light source and the temperature and humidity probe are respectively connected to a power line, and the power line passes through the hot melt plastic fusion area and extends out of the cable body and is connected to an external power supply.

[0010] Further, the size of the transparent cover plate is larger than the window of the inner sheath and smaller than the window of the outer sheath.

[0011] Further, the transparent cover plate covers at least 1 cm width of each side of the window of the inner sheath.

[0012] Further, there is a hot compress plastic fusion zone with a width of at least 1 cm between the outer sheath and the transparent cover plate.

[0013] An installation method for a visual stay cable includes the following steps:

[0014] Cut the outer sheath along the half diameter of the stay cable body;

[0015] After cutting the outer sheath, cut the inner sheath along the one-third diameter of the stay cable body, and the center points of the outer sheath and the inner sheath along the cable body length are consistent;

[0016] After both the outer sheath and the inner sheath are cut, remove the wrapping tape, and then install the visual device for the stay cable;

[0017] Install the display light source and the temperature and humidity probe at the notch edge of the remaining inner sheath after cutting;

[0018] Connect the power supply wires to the display light source and the temperature and humidity probe respectively;

[0019] Install the transparent cover plate on the cutting notch of the inner sheath. The size of the transparent cover plate is larger than the cut inner sheath. After installing the transparent cover plate on the notch of the inner sheath, the power supply wires pass through the inside of the inner sheath and the transparent cover plate;

[0020] Cut a window in the cut outer sheath according to the position and size of the transparent cover plate. The window size is larger than the transparent cover plate, and then reinstall the cut outer sheath in its original position;

[0021] Weld the transparent cover plate to the outer sheath after cutting the window;

[0022] Pass the power supply wires of the display light source and the temperature and humidity probe through the hot compress plastic fusion area and lead them out of the cable body;

[0023] After the plastic in the fusion area cools down, polish the welded part to make its surface smooth;

[0024] Connect the power supply wires to the external power supply, and the installation is completed.

[0025] Further, the cut part of the outer sheath is on the lower side of the stay cable, the cutting length is 20 cm of the cable body length, and the cutting length of the inner sheath is 10 cm of the cable body length.

[0026] Further, the size of the transparent cover plate is larger than the cut inner sheath, and each side is 2 cm wider than the cutting notch of the inner sheath.

[0027] Further, the thickness of the transparent cover plate is less than the thickness of the outer sheath.

[0028] Further, when the transparent cover plate is installed on the notch of the inner sheath, the transparent cover plate is installed on the notch of the inner sheath at a position where it protrudes 2 cm more on each side.

[0029] Further, there is a 2-cm-wide hot compress plastic fusion area between the outer sheath and the transparent cover plate.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] The present invention provides a visualization window at the lower end of the stay cable. The durability of the visualization window material is basically the same as that of the cable body PE sheath. The visualization window is tightly combined with the cable body to prevent water vapor from infiltrating along the window edge due to reasons such as aging and vibration. A temperature and humidity sensor and a light source are provided inside the visualization window. The temperature and humidity sensor is a device or apparatus that converts temperature and humidity quantities into electrical signals that are easily measured and processed, reflecting the temperature and humidity changes inside the stay cable, facilitating timely collection of the temperature and humidity conditions inside the stay cable, and being able to analyze the changes in temperature and humidity, timely grasping the internal conditions of the cable body, and performing targeted maintenance on the stay cable to avoid potential safety hazards caused by untimely bridge maintenance and repair plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the cable body of the stay cable.

[0033] Figure 2 It is a sectional schematic diagram of the cable body of the stay cable.

[0034] Figure 3 It is a structural schematic diagram of the present invention.

[0035] Figure 4 It is a cutting schematic diagram of the outer sheath and the inner sheath of the present invention.

[0036] Figure 5 It is a schematic diagram of the cut part of the outer sheath and the inner sheath of the present invention.

[0037] Figure 6 It is an installation schematic diagram of the present invention.

[0038] Wherein:

[0039] Steel wire 1, wrapping tape 2, inner sheath 3, display light source 4, temperature and humidity probe 5, transparent cover plate 6, power cord 7, outer sheath 8. DETAILED DESCRIPTION OF THE INVENTION

[0040] To better understand the technical solution of the present invention, the following will be described in detail with reference to relevant drawings. It should be understood that the following specific embodiments are not intended to limit the specific implementation forms of the technical solution of the present invention, but are only the implementation forms that the technical solution of the present invention can adopt. It should be noted first that the description of the positional relationship of each component herein, such as component A is located above component B, is based on the relative positions of the components in the drawings and is not intended to limit the actual positional relationship of the components.

[0041] Embodiment 1:

[0042] See Figure 3 , Figure 3 A structural schematic diagram of a visual stay cable and its installation method is drawn. As shown in the figure, a visual stay cable and its installation method of the present invention includes steel wires 1, an inner sheath 3, a display light source 4, a temperature and humidity probe 5, a transparent cover plate 6, and an outer sheath 8. Multiple steel wires 1 are arranged in the center, and an inner sheath 3 is provided outside to wrap them, and an outer sheath 8 is provided outside the inner sheath 3 to wrap it.

[0043] Windows are provided at corresponding positions of the inner sheath 3 and the outer sheath 8, and a transparent cover plate 6 is provided in the window. The size of the transparent cover plate 6 is larger than the window of the inner sheath 3 and smaller than the window of the outer sheath 8.

[0044] A display light source 4 and a temperature and humidity probe 5 are provided in the window of the inner sheath 3. There are two display light sources 4, which are arranged oppositely, and the display light source 4 can adopt an LED lamp.

[0045] The transparent cover plate 6 covers a 1 cm wide area on each side of the window of the inner sheath 3, and a 2 cm wide hot compress plastic fusion area is provided between the outer sheath 8 and the transparent cover plate 6.

[0046] The display light source 4 and the temperature and humidity probe 5 are respectively connected to a power line 7. The power line 7 passes through the hot compress plastic fusion area and extends out of the cable body, and is connected to an external power supply. The external power supply is fixed to the upper side of the cable body of the stay cable using a strap.

[0047] The transparent cover plate 6 can adopt a transparent plastic sheet, which has flexibility and durability.

[0048] See Figures 1 to 6 , Figure 6 An installation schematic diagram of a visual stay cable is drawn. As shown in the figure, an installation method of a visual stay cable of the present invention includes the following contents:

[0049] See Figure 1 and Figure 2, according to the internal structure of the cable body, find the half-diameter line of the outer sheath 8 and the one-third diameter line of the inner sheath 3; prepare the stay cable visualization device: display light source 4, temperature and humidity probe 5, and transparent cover plate 6;

[0050] Cut the outer sheath 8 along the half-diameter of the stay cable body. The cutting part is the lower side of the stay cable, and the cutting length is 20 cm of the cable body length. When cutting the outer sheath 8, pay attention to avoiding damaging the inner sheath 3;

[0051] After cutting the outer sheath 8, cut the inner sheath 3 along the one-third diameter of the stay cable body. The cutting length is 10 cm of the cable body length. The center points of the outer sheath 8 and the inner sheath 3 along the cable body length are the same;

[0052] After both the outer sheath 8 and the inner sheath 3 are cut, remove the wrapping tape 2, and then install the stay cable visualization device;

[0053] Install two display light sources 4 and one temperature and humidity probe 5 at the notch edge of the remaining inner sheath 3 after cutting, and install them on three sides respectively. Use solid glue to fix the display light source 4 and the temperature and humidity probe 5;

[0054] Connect the display light source 4 and the temperature and humidity probe 5 to the power cord 7 respectively. The power cord 7 is a customized 2-core power cord with a diameter of 6 mm. The outer plastic of the power cord 7 has a certain heat therapy performance;

[0055] Install the transparent cover plate 6 on the cutting notch of the inner sheath 3. The size of the transparent cover plate 6 is slightly larger than the cut inner sheath 3, and each side is 2 cm wider than the cutting notch of the inner sheath 3. The thickness of the transparent cover plate 6 is half of that of the outer sheath 8; Install the transparent cover plate 6 on the notch of the inner sheath 3 at the position where each side is 2 cm wider. The power cord 7 passes through the inside of the inner sheath 3 and the transparent cover plate 6, and use glue to temporarily fix the transparent cover plate 6;

[0056] Cut a window on the cut outer sheath 8 according to the position and size of the transparent cover plate 6. Each side of the window is 1 cm wider than the transparent cover plate 6, and then reinstall the cut outer sheath 8 in its original position, and use glue and wire binding to temporarily fix it;

[0057] Use a welding torch and plastic welding rod to weld the cut outer sheath 8 to the original sheath together. The plastic welding rod should fill the heat therapy plastic fusion area between the outer sheaths 8; then weld the outer sheath 8 and the transparent cover plate 6 into one body. The plastic welding rod should fill the 1 cm wide heat therapy plastic fusion area between the outer sheath 8 and the transparent cover plate 6. To ensure sealing, the plastic welding rod should cross 1 cm beyond each side of the transparent cover plate 6, that is, there is a 2 cm wide heat therapy plastic fusion area between the outer sheath 8 and the transparent cover plate 6;

[0058] Lead the power lines 7 of the display light source 4 and the temperature and humidity probe 5 through the hot compress plastic fusion area and out of the cable body;

[0059] After the plastic in the fusion area cools, use a thousand-leaf disc and a wool polishing disc to polish the welded part to make its surface smooth. Connect the power line 7 to the external power supply, and fix the external power supply on the upper side of the cable body of the stay cable with a tie strap. Thus, the installation of the stay cable visualization device is completed.

[0060] The above are only specific application examples of the present invention and do not constitute any limitation to the protection scope of the present invention. Any technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of the protection of the rights of the present invention.

Claims

1. A method for installing a visual stay cable, characterized in that: The visual stay cable includes a cable body, in which multiple steel wires (1) are provided. It also includes an inner sheath (3), a display light source (4), a temperature and humidity probe (5), a transparent cover plate (6) and an outer sheath (8). The multiple steel wires (1) are arranged in the center, and are wrapped by an inner sheath (3) on the outside. An outer sheath (8) is provided and wrapped outside the inner sheath (3); Windows are provided at corresponding positions of the inner sheath (3) and the outer sheath (8), and a transparent cover plate (6) is provided in each window; A display light source (4) and a temperature and humidity probe (5) are provided in the window of the inner sheath (3). The display light source (4) and the temperature and humidity probe (5) are respectively connected to a power line (7). The power line (7) passes through the connection between the transparent cover plate (6) and the outer sheath (8) and is led out of the cable body, and is connected to an external power supply; The size of the transparent cover plate (6) is larger than the window of the inner sheath (3) and smaller than the window of the outer sheath (8); The transparent cover plate (6) covers at least 1 cm width of each side of the window of the inner sheath (3); There is at least 1 cm wide hot compress plastic fusion area between the outer sheath (8) and the transparent cover plate (6); The installation method includes the following: Cut the outer sheath (8) along the half diameter of the stay cable body; After cutting the outer sheath (8), cut the inner sheath (3) along one-third of the diameter of the stay cable body. The center points of the outer sheath (8) and the inner sheath (3) along the cable body length are the same; After both the outer sheath (8) and the inner sheath (3) are cut, remove the wrapping tape (2), and then install the visual stay cable device; Install the display light source (4) and the temperature and humidity probe (5) at the notch edge of the remaining inner sheath (3) after cutting; Connect the display light source (4) and the temperature and humidity probe (5) to the power line (7) respectively; Install the transparent cover plate (6) on the cutting notch of the inner sheath (3). The size of the transparent cover plate (6) is larger than the cut inner sheath (3). After installing the transparent cover plate (6) on the notch of the inner sheath (3), the power line (7) passes through the inside of the inner sheath (3) and the transparent cover plate (6); The size of the transparent cover plate (6) is larger than the cut inner sheath (3), and each side is 2 cm wider than the cutting notch of the inner sheath (3); Cut a window in the cut outer sheath (8) according to the position and size of the transparent cover plate (6). The window size is larger than the transparent cover plate (6), and then reinstall the cut outer sheath (8) in the original position; When the transparent cover plate (6) is installed on the notch of the inner sheath (3), install the transparent cover plate (6) on the notch of the inner sheath (3) at a position 2 cm more on each side; There is a 2 cm wide hot compress plastic fusion area between the outer sheath (8) and the transparent cover plate (6); Weld the transparent cover plate (6) and the cut outer sheath (8); Lead the power lines (7) of the display light source (4) and the temperature and humidity probe (5) out of the cable body through the hot compress plastic fusion area; After the plastic in the area to be fused cools down, polish the welded part to make its surface smooth. Finally, connect the power cord (7) to an external power supply to complete the installation.

2. A method for installing a visual stay cable according to claim 1, characterized in that: The cut part of the outer sheath (8) is on the lower side of the stay cable, and the cutting length is 20 cm of the cable body length, and the cutting length of the inner sheath (3) is 10 cm of the cable body length.

3. A method for installing a visual stay cable according to claim 1, characterized in that: The thickness of the transparent cover plate (6) is half of that of the outer sheath (8).

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