Rapid installation method for carbon fiber wire crossing construction

Abstract

The invention relates to the technical field of wire crossing installation, in particular to a rapid installation method for carbon fiber wire crossing construction. Comprising the following steps: (1) firstly, selecting a carbon fiber wire with the length of A, and measuring the tensile strength of the carbon fiber wire; selecting a section of carbon fiber wire with the length of B, and measuring the flexibility parameter of the carbon fiber wire; (2) then, establishing an analog simulation test model of the overhead conductor, and determining the model of traction equipment; (3) carrying out a carbon fiber wire installation test with the length of C in a wide field; (4) on the premise that the traction equipment meets a carbon fiber wire installation test, the traction equipment and the tension equipment with determined parameters and models are adopted to carry out a construction method of dragging a new wire by an old wire to complete spanning installation; the traction speed, the traction force and the anti-traction force of the wire are controlled according to the physical and mechanical characteristics of the wire, traction equipment parameters are determined according to the calculated parameters, and proper traction equipment is selected, so that the construction efficiency is improved, the installation quality of the wire is improved, and construction standards are established for enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of conductor spanning installation, and in particular to a rapid installation method for carbon fiber conductor spanning construction. Background Art

[0002] According to the construction requirements of the crossing railway line, combined with the physical characteristic parameters of the carbon fiber composite core conductor, the appropriate tensioning equipment is selected, the installation method of the overhead conductor is determined, and the rapid installation of the conductor is realized under the premise of ensuring construction safety. This is an urgent problem to be solved.

[0003] In the past, the installation of overhead wires for high-voltage lines was done by manually removing old wires and re-laying new wires. Since this method cannot control the deflection of the wire during installation, it is mainly suitable for the installation of steel-core aluminum stranded wires, and therefore cannot be used for carbon fiber wire installation projects. If the installation tension of the carbon fiber wire cannot be controlled, the wire may be damaged, resulting in rework, causing economic losses and even affecting the safety of railway operations. Summary of the invention

[0004] The invention overcomes the deficiencies of the prior art and provides a rapid installation method for carbon fiber conductor crossing construction.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a rapid installation method for carbon fiber conductor crossing construction, comprising the following steps: (1) First, a section of carbon fiber wire with a length of A is selected and a tensile test is performed using an electronic universal testing machine in the laboratory to measure its tensile strength; a section of carbon fiber wire with a length of B is selected and a bending test is performed to measure its flexibility parameters, where B>A; (2) Then, a similar simulation test model of the overhead wire is established, and the material mechanics theory is used to calculate the wire tension when the ultimate deflection of the wire is 50d, where d is the wire diameter. This is used to determine the parameters of the required traction equipment and then the model of the traction equipment; (3) With the parameters and model of the traction equipment determined, a carbon fiber conductor installation test with a length of C is carried out in a wide area, and a laser sensing device is set at the lowest allowable limit to check whether the traction equipment can meet the installation requirements of the conductor; (4) On the premise that the traction equipment meets the carbon fiber conductor installation test, the traction equipment and tension equipment with determined parameters and models are used to complete the spanning installation by using the old conductor to pull the new conductor.

[0006] As a further limitation of the technical solution of the present invention, in step (1), the value of A is 500 mm, and the value of B is 2000 mm.

[0007] As a further limitation of the technical solution of the present invention, the similar simulation test model of the overhead wire described in step (2) includes two tripod bodies, the carbon fiber wire is mounted on the two tripod bodies, one end of the carbon fiber wire is connected to a simple traction device, and the other end is connected to a simple tension device.

[0008] As a further limitation of the technical solution of the present invention, the parameters of the traction equipment in step (2) include traction speed, traction force and counter-traction force.

[0009] As a further limitation of the technical solution of the present invention, the value of C in step (3) is 220m.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention studies the physical and mechanical properties of carbon fiber composite core conductors, simulates the tensile strength and bending fracture tests of the conductors, and analyzes the parameters of the conductors. A similar simulation research model for carbon fiber conductor overhead lines is established, and the traction equipment parameters are determined according to the calculated parameters, and appropriate tensioning equipment is selected accordingly. A method for safely and quickly completing the installation of carbon fiber conductors across the line is summarized, so as to establish construction standards for enterprises and lay the foundation for the construction of similar projects in the future.

[0011] By optimizing the installation method and parameters of high-voltage line carbon fiber conductors crossing railways, the construction safety of the conductors crossing railways is ensured while improving construction efficiency and reducing construction costs. This technology has reached the advanced level in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of a similar simulation test model for overhead wires.

[0013] Figure 2 This is a front view of the construction process of the tensioning equipment spanning.

[0014] Figure 3 A top view of the insulating mesh blocking the railway track.

[0015] The following are marked in the figure: 1-Tripod body, 2-Carbon fiber wire, 3-Simple traction device, 4-Simple tension device. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with specific embodiments. Example 1

[0017] At present, the company is constructing the G27-G28 tower of the old reconstruction and resistant section of the No. 2 Mine high-voltage line across the ShiTai Line, the G73#-G74# of the Suyu to Yangmei West 110kV double-circuit transmission line project across the ShiTai Line, and the No. 2 Mine power supply line hidden danger treatment project 7#-8# across the ShiTai Railway. To ensure the safety of railway operation, after communicating with the railway management department, the metal steel pipe frame is set up on both sides under the condition of effective use of terrain conditions, and the contact network is shut down within the first "window point" specified by the railway for safety protection construction of track network closure; the contact network is shut down within the second "window point" for track network dismantling construction. The network closure and crossing construction are carried out from the first "window point" to the second "window point". During the crossing construction, the ground wire is deployed without blocking the line and the driving equipment is not stopped, and it is an uninterrupted construction, requiring the crossing construction speed to be fast.

[0018] Carbon fiber composite core conductors are used in the capacity expansion and reconstruction of high-voltage lines. They are made of multiple soft aluminum single wires and carbon fiber composite cores twisted concentrically. The conductor has a series of advantages such as light weight, high tensile strength, high conductivity, low line loss, and large current carrying capacity. However, the conductor has poor bending resistance and is prone to brittle fracture, which is not easy to detect. During the construction process, the conductor must have sufficient tension during installation and must not be bent or deformed.

[0019] In the past, the installation of overhead wires for high-voltage lines was done by manually removing old wires and re-laying new wires. Since this method cannot control the deflection of the wire during installation, it is mainly suitable for the installation of steel-core aluminum stranded wires, and therefore cannot be used for carbon fiber wire installation projects. If the installation tension of the carbon fiber wire cannot be controlled, the wire may be damaged, resulting in rework, causing economic losses and even affecting the safety of railway operations.

[0020] Therefore, the following method is used to carry out the rapid installation construction of carbon fiber conductor across the railway, including the following steps: (1) First, a section of carbon fiber wire with a length of 500 mm was selected and subjected to a tensile test using an electronic universal testing machine in the laboratory. The tensile strength was measured to be 3000 MPa. A section of carbon fiber wire with a length of 2000 mm was selected and subjected to a bending test to measure its flexibility parameter. The measured flexibility parameter was 50 d. (2) Then, a similar simulation test model of overhead conductors is established (such as Figure 1As shown, the similar simulation test model of the overhead wire includes two tripod bodies 1, and the carbon fiber wire 2 is mounted on the two tripod bodies 1. One end of the carbon fiber wire is connected to a simple traction device 3, and the other end is connected to a simple tension device 4); using the material mechanics theory, the wire tension is calculated to be 200N when the ultimate deflection of the wire is 50d, d is the wire diameter, and thus the parameters of the traction equipment are determined (we determine the parameters of the traction equipment through the tensile strength and flexibility parameters of step (1) and the wire tension of step (2), according to the formula "wire tension = wire stress × wire cross-sectional area", it is known that the tensile strength of the carbon fiber wire is 3000Mpa, the wire stress does not exceed 25% of the tensile strength, and the cross-sectional area is 240mm2, then the wire tension = 3000*25%*240=180000N=180KN) the parameters of the required traction equipment: traction speed 3m-5m / min, traction force 180KN and anti-traction force -180KN, and then the model of the traction equipment is determined as: YL-YQ180 hydraulic traction machine 180 KN (18T); (3) With the parameters and model of the traction equipment determined, a carbon fiber conductor installation test with a length of 220 m is carried out in a wide area, and a laser sensing device is set at the lowest allowable limit to verify whether the traction equipment can meet the installation requirements of the conductor; (4) On the premise that the traction equipment meets the carbon fiber conductor installation test, the traction equipment and tension equipment with determined parameters and models are used to complete the crossing installation by the old conductor pulling the new conductor. First, the conductors on both sides are removed and dropped to a certain height, and corresponding tension fixing measures are taken to prevent the wire from running. The original old conductor needs to be removed and dropped to the ground on the wire-laying side, and the new conductor is wound into the tension machine in advance (reverse traction). The head of the old conductor and the head of the new conductor are fixedly connected with a special net sleeve, and the new conductor is placed in a special nylon pulley; the wire rope tensioner of the traction machine on the wire-pulling side is connected to the old conductor, and the nylon pulley is placed to meet the conditions for the old conductor to pull the new conductor. The tension machine sets the reverse traction tension for this time, and the staff on both sides are equipped with walkie-talkies for instant communication. Then, when the conditions are met, the traction machine on the wire-pulling side starts traction, and the tension machine on the wire-laying side cooperates with the wire-laying side. During the traction process, the changes in the traction force and reverse traction force on both sides are observed, and the tension value standard is adjusted in time. When the conductor is pulled in place, the tensioner on the wire-laying side clamps the new conductor, and the conductor meets the length discontinuity of the hanging point. The wire tensioner on this side is made and connected to the tower hanging point. After the connection, the tension machine on the wire-laying side is completed. The wire pulling side continues to pull until the wire meets the sag tension standard for wire erection, then stops pulling, marks the wire break and makes the wire tensioner on this side, and completes the connection with the tower hanging point. Finally, install the line accessories and complete the single wire replacement.

[0021] During the installation of overhead lines across railways, the traction speed, traction force and counter-traction force of the conductors are controlled according to the physical and mechanical properties of the conductors. According to the calculated parameters, appropriate tensioning equipment is selected, which not only improves the construction efficiency, but also improves the installation quality of the conductors.

Claims

1. A rapid installation method for carbon fiber conductor crossing construction, characterized in that: The following steps are involved: (1) First, a section of carbon fiber wire with a length of A is selected and a tensile test is performed in the laboratory using an electronic universal testing machine to measure its tensile strength; A section of carbon fiber wire with a length of B is selected for bending test to measure its flexibility parameters, where B>A; (2) Then, a similar simulation test model of the overhead wire is established, and the material mechanics theory is used to calculate the wire tension when the ultimate deflection of the wire is 50d, where d is the wire diameter. This is used to determine the parameters of the required traction equipment and then the model of the traction equipment; (3) With the parameters and model of the traction equipment determined, a carbon fiber conductor installation test with a length of C is carried out in a wide area, and a laser sensing device is set at the lowest allowable limit to check whether the traction equipment can meet the installation requirements of the conductor; (4) On the premise that the traction equipment meets the carbon fiber conductor installation test, the traction equipment and tension equipment with determined parameters and models are used to complete the spanning installation by using the old conductor to pull the new conductor.

2. A rapid installation method for carbon fiber conductor crossing construction according to claim 1, characterized in that: In step (1), the value of A is 500 mm and the value of B is 2000 mm.

3. A rapid installation method for carbon fiber conductor crossing construction according to claim 1, characterized in that: The similar simulation test model of the overhead wire described in step (2) comprises two tripod bodies (1), a carbon fiber wire (2) is mounted on the two tripod bodies (1), one end of the carbon fiber wire is connected to a simple traction device (3), and the other end is connected to a simple tension device (4).

4. A rapid installation method for carbon fiber conductor crossing construction according to claim 1, characterized in that: The parameters of the traction device in step (2) include traction speed, traction force and counter-traction force.

5. The rapid installation method for carbon fiber conductor crossing construction according to claim 1 is characterized in that: The value of C in step (3) is 220m.

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