A method and system for simulating superconducting cable laying test

Abstract

The present invention discloses a method and system for simulating superconducting cable laying test, the method comprising: step 1: according to the actual path of the superconducting cable obtained by mapping, selecting and simulating the on-site environmental conditions, arranging the test site, and simulating the superconducting cable laying test; step 2: confirming the traction force and lateral pressure test scheme of each measuring unit in the superconducting cable laying process, and conducting traction force and lateral pressure tests according to the test scheme; step 3: analyzing the test data of step 2, optimizing and adjusting the working well, the arrangement mode of the pipe and the cable laying scheme in the actual on-site laying working conditions. The present invention ensures that the superconducting cable is not damaged during the laying process by controlling the traction force and lateral pressure during the cable laying process.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer detection, and relates to a method and system for simulating superconducting cable laying tests. Background Art

[0002] Due to the special characteristics of superconducting cables, the traction and lateral pressure during their laying process must be strictly controlled to ensure that the superconducting cables are not damaged during the laying process. In order to determine the maximum traction and lateral pressure that may occur during the laying of each section of superconducting cable, and to determine the number of additional working wells required to set up crawler conveyors to reduce the traction and lateral pressure to meet the safety design requirements of the superconducting cable, superconducting cable sample laying tests are required. Summary of the Invention

[0003] In order to address the deficiencies in existing site conditions and prior art, the present application provides a method and system for simulating a superconducting cable laying test.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A method for simulating a superconducting cable laying test comprises the following steps:

[0006] Step 1: Based on the actual superconducting cable path obtained through surveying and mapping, select and simulate the on-site environmental conditions and arrange the test site for simulating the superconducting cable laying test;

[0007] Step 2: Confirm the traction force and lateral pressure test plan for each measurement unit during the superconducting cable laying process, and conduct traction force and lateral pressure tests according to the test plan;

[0008] Step 3: Analyze the test data from step 2, and optimize and adjust the work well, pipe layout, and cable laying plan for the actual on-site installation conditions.

[0009] The present invention further includes the following preferred embodiments:

[0010] Preferably, step 1 specifically includes:

[0011] Step 1.1: Select a test site based on the actual path of the simulated superconducting cable;

[0012] Step 1.2: Analyze the test site, confirm the test line path based on the actual path of the simulated superconducting cable, and arrange the cable channel of the test site, including arranging the bridge deck cable trench, straight joint cable trench, straight joint well, corner well, and pipe arrangement;

[0013] Step 1.3: Arrange the cable laying equipment based on the cable channel of the test site, including conveyors, rollers, motorized rollers, and steering guide wheels.

[0014] Preferably, the traction force test scheme in step 2 is specifically as follows:

[0015] The traction force measuring device is installed between the traction head and the traction machine wire rope to measure and record the traction tension of the traction head before and after each turn, before and after pipe threading, and before and after simulated bridge crossing, and at the same time record the tension on the traction machine.

[0016] Preferably, in step 2, the traction force test is directed and recorded by a dedicated person, who closely follows the traction head and directs the simultaneous recording of each measuring point, which is then summarized.

[0017] Preferably, in step 2, at least three traction tests are performed, and after each laying is completed, the sample cable is retrieved onto the cable drum for the next laying.

[0018] Preferably, the lateral pressure test scheme in step 2 is specifically as follows:

[0019] The lateral pressure of the cable at each corner is measured by a tension measuring device installed on the steering guide wheel, and the change in the outer diameter of the cable before, during and after the turn is measured with a caliper.

[0020] Preferably, in step 2, before the test, the pulling force of the traction head is calibrated with the actual pulling force, and the side pressure displayed by the tension measuring device is calibrated with the actual pressure.

[0021] Preferably, in step 2, when the traction force and lateral pressure tests are performed, the test conditions are photographed and recorded.

[0022] Preferably, step 2 also includes visual inspection of the cable:

[0023] During and after the traction process, the cable appearance is inspected, including measuring and taking photos to check whether the cable outer sheath is damaged, whether the heat shrink protective layer outside the annular corrugated tube is damaged, the deformation of the straight tube at the end of the bend, and the deformation of the annular corrugated tube and both ends.

[0024] The present invention also discloses a system for simulating a superconducting cable laying test, the system comprising:

[0025] The test site selection and layout module is used to select and arrange the test site according to the actual path of the simulated superconducting cable, and is used to simulate the superconducting cable laying test;

[0026] The simulation test module is used to confirm the traction force and lateral pressure test plan. According to the test plan, the test data measurement points are confirmed and the measurement equipment is arranged. The superconducting cable laying is simulated to conduct traction force and lateral pressure tests.

[0027] The laying plan optimization module is used to analyze the test data of the simulation test module and optimize the superconducting cable laying plan.

[0028] Beneficial effects achieved by this application:

[0029] According to the present invention, based on the particularity of superconducting cables, the maximum traction force and lateral pressure that may occur during the laying of each section of superconducting cable are obtained, and the number of additional working wells for setting up crawler conveyors is determined in order to reduce the traction force and lateral pressure to meet the safety design conditions of the superconducting cable. By controlling the traction force and lateral pressure during the cable laying process, it is ensured that the superconducting cable is not damaged during the laying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of a method for simulating superconducting cable laying test according to the present invention;

[0031] Figure 2 This is a plan view of the test site in an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the cable channel of the test site in an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of the arrangement of cable laying equipment in an embodiment of the present invention;

[0034] Figure 5 This is a diagram of test data measurement locations in an embodiment of the present invention;

[0035] Figure 6 This is the laying test data in the embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0037] like Figure 1 As shown, a method for simulating a superconducting cable laying test of the present invention comprises the following steps:

[0038] Step 1: Select and arrange a test site based on the actual path of the simulated superconducting cable to simulate the superconducting cable laying test, including:

[0039] Step 1.1: Based on the actual path conditions of the superconducting cable to be simulated, list the basic constraints, such as the length of the pipe section, the angle of the corner shaft, the height difference of the bridge, the depth of the cable trench, etc., and select the test site;

[0040] The selection of test sites mainly considers the following factors:

[0041] 1. The conditions for cable laying construction should be met, including channel width, construction access, cable drum transportation and parking, etc.

[0042] 2. It should meet the conditions for simulating the construction of the actual complex channel environment of the project;

[0043] 3. The total length of the cable channel in the test site should meet the laying requirements of the maximum coil length of the superconducting cable.

[0044] In the embodiment of the present invention, Figure 2 The test area shown is located in a leased area 250 meters south of S32 and 100 meters west of Lianhua Road. The site is approximately 100 meters long from north to south and 150 meters long from east to west.

[0045] Step 1.2: Analyze the test site, confirm the test line path based on the actual path of the simulated superconducting cable, and arrange the cable channel of the test site, including arranging the bridge deck cable trench, straight joint cable trench, straight joint well, corner well, and pipe arrangement;

[0046] The cable channel type in the site is simulated and arranged according to the actual project conditions, including various channel conditions and working conditions in actual channel conditions.

[0047] In the embodiment of the present invention, the most complex joint 1#2# section in the actual superconducting cable path simulated includes a bridge deck cable trench and a 90° corner. The actual length of this section is 400m. Due to site limitations, the test line path length is 293m. The layout of the bridge deck cable trench, straight joint cable trench, straight joint work well, corner work well, and pipe arrangement is as follows: Figure 3 shown.

[0048] Step 1.3: Arrange the cable laying equipment based on the cable channel of the test site, including conveyors, rollers, motorized rollers, and steering pulleys.

[0049] The conveyor is a power output device for cable laying and is installed in the work pit or cable trench to transport the cable in the forward direction.

[0050] The support wheel is a device that supports the cable, lifting the cable to avoid direct contact with the ground;

[0051] The electric roller is used as a power output device for cable laying and is installed in a long-distance cable trench to transport the cable in the forward direction;

[0052] The steering pulley serves as a guide device for cable steering and laying. It is installed at the corner shaft of the channel. It bears lateral pressure during the cable traction and transportation process and guides the cable steering angle at the same time.

[0053] In the embodiment of the present invention, Figure 4As shown, there are 8 conveyors, 42 supporting rollers, 15 electric rollers, and 20 steering pulleys.

[0054] Step 2: Confirm the traction force and lateral pressure test plan. According to the test plan, confirm the test data measurement points and arrange the measurement equipment. Simulate the superconducting cable laying and conduct the traction force and lateral pressure tests.

[0055] In practice, step 2 also includes visual inspection of the cable:

[0056] During and after the traction process, the cable appearance is inspected, including measuring and taking photos to check whether the cable outer sheath is damaged, whether the heat shrink protective layer outside the annular corrugated tube is damaged, the deformation of the straight tube at the end of the bend, and the deformation of the annular corrugated tube and both ends.

[0057] The traction force test scheme is specifically as follows:

[0058] The traction force measuring device is installed between the traction head and the traction machine wire rope to measure and record the traction tension of the traction head before and after each turn, before and after pipe threading, and before and after simulated bridge crossing, and at the same time record the tension on the traction machine.

[0059] The traction test is directed and recorded by a dedicated person. The commander follows the traction head closely, directs each measuring point to record simultaneously, and finally summarizes it.

[0060] That is, the traction test includes the recording and analysis of the traction force of the traction machine and the traction head, taking photos and videos before and after the cable turns, and checking the appearance.

[0061] The lateral pressure test scheme is specifically as follows:

[0062] The lateral pressure of the cable at each corner is measured by a tension measuring device installed on the steering pulley. At the same time, a caliper is used to measure the change in the outer diameter of the cable before, during and after the turn, and the changes are recorded by taking photos and videos.

[0063] In the embodiment of the present invention, the test data measurement position is as follows Figure 5 As shown, B3, B4, and B5 are work pits, B5-1 and B6 are cable trenches, and A1 and A2 are temporary work pits. Points 1 to 13 are the positions of the traction head when data recording is required. Points 1 and 13 are measurement points at the entry and exit of the work pit or cable trench. Measurement point 1 is the starting point of the laying process and the cable drum outlet, where the cable outlet pulling force is measured. Measurement points 2 and 3 are corner locations, where lateral pressure is measured. Measurement point 4 is a key point in the laying process, where the pulling force at the cable end is measured. Data and photos are recorded simultaneously at each measurement point. After passing the B5 and B4 work pits and exiting the pipe, the traction should be paused for visual inspection and measurement. Any problems should be marked with a marker and photographed. A detailed inspection should be carried out after the next turn and exiting the pipe.

[0064] Before the test, the pulling force of the traction head was checked against the actual pulling force;

[0065] The side pressure displayed by the tension measuring device and the actual pressure were calibrated by using the steering pulley force display and actual weight test.

[0066] The steering pulley is basically in the midpoint stress state, and the measurement data are shown in Table 1:

[0067]

[0068] Table 1 Test results of steering pulley force display and actual weight

[0069] The test results show that since the pulley tension measuring device (measuring pressure strain gauge) uses a lever method, the actual force is theoretically twice the displayed force value, and the digital display should be reassigned. This embodiment does not reassign the value, and the actual force is 1.84 times the displayed force value after testing.

[0070] Preferably, the steering pulley is in a vertical state during actual use, and the wire rope or cable is basically not in the middle position when close to the pulley, so the ratio relationship cannot be determined. However, the cable has a large diameter, and the actual force when it is close to the steering pulley is basically 2 (1.84) times the displayed value.

[0071] During specific implementation, at least three traction force tests are carried out. After each laying is completed, the sample cable is taken back to the cable drum for the next laying and used for comparative analysis of multiple values.

[0072] Step 3: Analyze the experimental data from step 2 and optimize the superconducting cable laying plan.

[0073] In the embodiment, the second superconducting cable laying test was carried out according to the optimized superconducting cable laying scheme. The traction machine + cable drum power was released, the conveyor and electric roller assisted when the traction head turned, and the traction force and side pressure were systematically recorded. The laying test data records are as follows: Figure 6As shown. Specifically, the pure traction process was completed. Before the first right-angle turn, the pulling force was around 300kg, and the side pressure of the wire rope at the corner was mostly below 2kN. After the turn, the pulling force was around 1.1t, and the side pressure of the cable at the corner was around 2kN. After the second right-angle turn, the pulling force rose to 1.6t, and the side pressure increased. After the conveyor was used to assist, the side pressure dropped to around 700kg, and the side pressure at the previous corner did not change much. After the second turn, without the need for conveyors or other assistance, the pulling force was around 1.7t, and the side pressure at each point slightly exceeded 2kN. Finally, with the line drums synchronously turned on and the conveyors and electric rollers turned off, the maximum pulling force at the end point was 16kN. The side pressure of each steering pulley met the requirements, and the cable was not damaged. The situation was even better due to the addition of conveyors and electric rollers during cable laying.

[0074] The applicant of the present invention has made a detailed explanation and description of the implementation examples of the present invention in conjunction with the drawings in the specification. However, those skilled in the art should understand that the above implementation examples are only preferred implementation plans of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, and is not a limitation on the scope of protection of the present invention. On the contrary, any improvements or modifications based on the inventive spirit of the present invention should fall within the scope of protection of the present invention.

[0075] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A system for simulating superconducting cable laying test, characterized in that: The system comprises: The test site selection and layout module is used to select and layout the test site according to the actual path of the simulated superconducting cable, and is used to simulate the superconducting cable laying test; The simulation test module is used to confirm the traction force and lateral pressure test plan. According to the test plan, the test data measurement points are confirmed and the measurement devices are arranged to simulate the superconducting cable laying and conduct traction force and lateral pressure tests. The laying scheme optimization module is used to analyze the test data of the simulation test module and optimize the superconducting cable laying scheme; The method of selecting and arranging a test site according to the simulated actual path of the superconducting cable for simulating the superconducting cable laying test includes: Step 1.1: Select the test site according to the actual path conditions of the simulated superconducting cable; Step 1.2: Analyze the test site, confirm the test line path according to the actual path of the simulated superconducting cable, and arrange the cable channel of the test site, including arranging the bridge deck cable trench, straight joint cable trench, straight joint well, corner well, and pipe arrangement; Step 1.3: Arrange the cable laying equipment based on the cable channel of the test site, including conveyors, rollers, electric rollers and steering pulleys; The specific traction test plan is as follows: Install the traction force measuring device between the traction head and the traction machine wire rope, measure and record the traction tension of the traction head before and after each turn, before and after the pipe is passed, before and after the simulated bridge crossing, and record the tension on the traction machine at the same time; The traction force test is directed and recorded by a dedicated person. The person in charge closely follows the traction head and directs each measuring point to record simultaneously and summarizes the results at the end. Carry out at least three traction tests. After each laying, take the sample cable back to the cable drum for the next laying. The specific lateral pressure test plan is as follows: The lateral pressure of the cable at each turning corner is measured by a tension measuring device installed on the steering pulley, and the change in the outer diameter of the cable before, during and after the turn is measured with a caliper; Before the test, the pulling force of the traction head was calibrated with the actual pulling force, and the side pressure displayed by the tension measuring device was calibrated with the actual pressure; When conducting traction and lateral pressure tests, take photos and videos to record the test conditions; The traction force and lateral pressure test plan is confirmed, and according to the test plan, the test data measurement points are confirmed and the measurement equipment is arranged, the superconducting cable laying is simulated, and the traction force and lateral pressure tests are performed, which also includes the cable appearance inspection: During and after the traction process, the cable appearance is inspected, including measuring and photographing the damage to the cable outer sheath, the damage to the heat shrink protective layer on the outer side of the annular corrugated tube, the deformation of the straight tube ends at the turning point, and the deformation of the annular corrugated tube and both ends.

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