Main cable pre-tightening method and system based on main cable global real-time temperature

Abstract

The invention relates to the technical field of cable production, in particular to a main cable pre-tightening method and system based on the global real-time temperature of a main cable. Comprising the steps that when a main cable is manufactured, a plurality of main cable strands are selected to install temperature optical fibers, the temperature optical fibers are arranged along the main cable strands in a full-length mode, and a plurality of temperature grating measuring points are evenly arranged on the temperature optical fibers in the length direction at intervals; when the main cable is assembled, the main cable strand is installed in place according to a set position; before the main cable is pre-tightened, a temperature sensor is arranged on the outer side of the main cable; when the temperature difference between the internal temperature of the main cable and the surface temperature of the main cable is within a set range, the main cable is pre-tightened; and the operations are performed in sequence until all positions of the main cable are pre-tightened. According to the main cable pre-tightening method, the data of the minimum temperature difference inside and outside the main cable can be obtained in real time, the cable pre-tightening operation quality can be improved, the occurrence probability of the phenomena of twisting, stringing and bulging of steel wires of the main cable is reduced, and the control level of the main cable is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of cable production, and specifically to a main cable pre-tensioning method and a main cable pre-tensioning system based on the global real-time temperature of the main cable. Background Art

[0002] After all the cables of the suspension bridge are installed, the cross section of the main cable is hexagonal. It is necessary to use the pre-tightening and formal cable tightening process to shape the main cable from a hexagon into a round shape and achieve the designed void ratio to facilitate the subsequent installation of the cable clamp. The linear shape of each cable strand and its steel wire in the main cable is closely related to the temperature. During the daytime heating process, the main cable cross section is affected differently by solar radiation, resulting in a temperature gradient in the main cable cross section. This causes the steel wires in the high temperature area to droop to the lower layer, and the steel wires in the low temperature area to move to the upper layer, which is the wire stringing phenomenon. In addition, because the main cable is in the air, the strong wind will cause the wires to twist and the wires to bulge due to uneven local force.

[0003] The twisted wire, stringed wire and drum wire cause the arrangement position of the steel wire to be different from the designed parallel arrangement position. If the pre-tightening operation is performed directly on it, the steel wire may be bent under the strong external force of the cable tightening and lose its load-bearing function or be squeezed and arranged in a non-designed position, resulting in uneven force on the steel wire. Therefore, in order to ensure the quality of the pre-tightening cable, the pre-tightening operation is generally carried out at night when the temperature is relatively stable, the temperature of the inner and outer strands of the main cable is basically balanced, and the strands are neatly arranged. In order to obtain the time when the temperature of the inner and outer strands of the main cable is basically balanced, a certain number of temperature sensors are generally arranged inside and outside the strands of the main cable at the mid-span section to obtain the time history curve of the temperature change inside and outside the main cable, so as to determine the time period with the minimum temperature difference inside and outside the main cable to guide the construction of the pre-tightening cable. Obviously, there is a large error in using the internal and external change law of the main cable of a single cross-section of the short-term main cable to characterize the temperature change law of the entire main cable section, especially at the place where the bridge site environment changes drastically. Summary of the invention

[0004] The purpose of the present application is to solve the deficiencies of the above-mentioned background technology and to provide a main cable pre-tensioning method and a pre-tensioning cable system based on the real-time temperature of the entire main cable.

[0005] The technical solution of the present application is: a main cable pre-tightening method based on the real-time temperature of the entire main cable, comprising:

[0006] When manufacturing the main cable, select several main cable strands to install temperature optical fibers, the temperature optical fibers are arranged along the entire length of the main cable strands, and multiple temperature grating measuring points are evenly spaced along the length direction of the temperature optical fibers;

[0007] When assembling the main cable, the main cable strands are installed in place according to the set position, so that the main cable strands installed with temperature optical fibers are distributed at intervals in the radial direction of the main cable section;

[0008] Before pre-tensioning the main cable, a temperature sensor is arranged on the outside of the main cable;

[0009] The internal temperature of the main cable is collected based on the temperature optical fiber, and the surface temperature of the main cable is collected based on the temperature sensor; when the temperature difference between the internal temperature of the main cable and the surface temperature of the main cable is within the set range, the main cable is pre-tightened;

[0010] Repeat the operation in sequence until all positions of the main cable are pre-tightened.

[0011] According to a main cable pre-tensioning method based on the global real-time temperature of the main cable provided in the present application, the method of selecting a plurality of main cable strands to install temperature optical fibers comprises: selecting a plurality of main cable strands, and implanting the temperature optical fibers into the center position of the main cable strands along the axial direction of the main cable strands.

[0012] According to a main cable pre-tensioning method based on the real-time temperature of the main cable over the entire area provided by the present application, the method for installing the main cable strands in place according to the set position includes: arranging a main cable strand implanted with a temperature optical fiber at the center of the main cable, arranging at least one circle of main cable strands implanted with a temperature optical fiber around the main cable axis with the main cable axis as the center, each circle including a plurality of main cable strands implanted with a temperature optical fiber arranged at equal intervals in the circumferential direction of the main cable section.

[0013] According to a main cable pre-tensioning method based on the global real-time temperature of the main cable provided by the present application, the method of arranging temperature sensors on the outside of the main cable includes: arranging a plurality of temperature sensors equidistantly distributed along the circumferential direction on the outside of the main cable circumference at the temperature grating measuring points of the corresponding temperature optical fiber.

[0014] According to a main cable pre-tensioning method based on the global real-time temperature of the main cable provided by the present application, the internal average temperature of a section is calculated based on the temperatures collected by the temperature grating measuring points on all temperature optical fibers in the section; the external average temperature of the section is calculated based on the temperatures collected by all temperature sensors at the section; the difference between the internal average temperature and the external average temperature is calculated; if the difference does not exceed a set threshold, the main cable of the section is pre-tensioned, otherwise the main cable of the section is not pre-tensioned.

[0015] The present application also provides a main cable pre-tightening system based on the global real-time temperature of the main cable, wherein the cable tightening system is operated according to any one of the main cable pre-tightening methods based on the global real-time temperature of the main cable, including:

[0016] An internal temperature acquisition module, the internal temperature acquisition module comprising a plurality of temperature optical fibers implanted in the main cable strands, the temperature optical fibers being arranged along the entire length of the main cable strands and having a plurality of temperature grating measurement points evenly spaced along the length direction of the temperature optical fibers;

[0017] An external temperature acquisition module, the external temperature acquisition module comprising a plurality of temperature sensors arranged outside the circumference of the main cable;

[0018] A control module, wherein the control module is used to compare the internal temperature of the main cable collected by the internal temperature collection module with the internal temperature of the main cable collected by the temperature sensor, and to make a judgment that the main cable can be pre-tightened when the temperature difference between the two is within a set range, and to make a judgment that the main cable cannot be pre-tightened when the temperature difference between the two is not within the set range.

[0019] According to a main cable pretensioning cable system based on the global real-time temperature of the main cable provided in the present application, the internal temperature acquisition module includes a temperature optical fiber located in the main cable strand at the center of the main cable and at least one circle of temperature optical fiber group centered on the main cable axis, each group includes a plurality of temperature optical fibers equidistantly arranged along the circumference of the main cable section centered on the main cable axis.

[0020] According to a main cable pretensioning system based on the global real-time temperature of the main cable provided by the present application, the temperature sensor and the temperature grating measuring point on the corresponding temperature optical fiber are located on the same section of the main cable.

[0021] According to a main cable pretensioning system based on the global real-time temperature of the main cable provided by the present application, the multiple temperature sensors are arranged at equal intervals along the circumferential direction of the main cable section.

[0022] According to a main cable pre-tensioning system based on the global real-time temperature of the main cable provided by the present application, the control module includes:

[0023] An internal average temperature acquisition module, which calculates the internal average temperature of a section of the main cable according to the temperature obtained by a temperature grating measuring point on the section of the main cable;

[0024] An external average temperature acquisition module, which calculates the external average temperature of the section of the main cable according to the temperatures obtained by all temperature sensors on the section;

[0025] A temperature difference acquisition module, wherein the temperature difference acquisition module acquires the temperature difference between the internal average temperature and the external average temperature based on the internal average temperature and the external average temperature;

[0026] The judgment module is used to compare the temperature difference with a set threshold value, and make a judgment that the main cable can be pre-tightened when the temperature difference does not exceed the set threshold value, and make a judgment that the main cable cannot be pre-tightened when the temperature difference exceeds the set threshold value.

[0027] The advantages of the present application are as follows: 1. The present application installs multiple temperature optical fibers inside the main cable and uses the temperature optical fibers to collect the internal temperature of the main cable before pre-tightening. The present application can collect the temperature in real time at multiple positions of the main cable section, and the obtained internal temperature of the main cable is more intensive and uniform, the reliability of the monitoring data is better, and it is not easy to have errors. Moreover, by configuring an external temperature sensor, the external temperature and the internal temperature are compared in real time, which can avoid the problem of cable tightening errors when the temperature difference is large to the greatest extent, improve the quality of pre-tightening cable operations, reduce the probability of twisting, stringing and drumming of the main cable steel wire, and improve the control level of the main cable;

[0028] 2. The present application implants the temperature optical fiber into the center of the main cable strand in advance. This arrangement can avoid damage to the temperature optical fiber during the subsequent main cable tightening process and increase the service life of the temperature optical fiber. The arrangement of the temperature optical fiber in advance facilitates subsequent operations. At the same time, the temperature optical fiber implanted in the main cable strand can accurately obtain the temperature inside the main cable.

[0029] 3. The arrangement of the main cable strands implanted with temperature optical fibers in this application can make the temperature optical fibers evenly located in the main cable, and can collect temperature at different positions of the main cable section, more accurately obtain the temperature conditions inside the main cable, and can obtain the full-range temperature data of the temperature inside the main cable in real time, which can improve the accuracy of the measurement data;

[0030] 4. The present application arranges a temperature sensor at the temperature grating measuring point position corresponding to the temperature optical fiber. The external temperature collected by the temperature sensor and the internal temperature collected by the temperature optical fiber can correspond to each other, corresponding to the temperature conditions on the same section, and can accurately reflect the temperature difference between the inside and outside of the section, making it convenient to judge whether the cable can be tightened;

[0031] 5. The cable tightening judgment method of the present application is very simple. By obtaining the temperature difference between the internal average temperature and the external average temperature, the temperature difference is compared with the set threshold. As long as the temperature difference is less than the set threshold, it is considered that the cable tightening operation can be carried out, which effectively avoids the problem of cable tightening errors caused by excessive temperature difference, improves the quality of pre-tightening cable operations, reduces the probability of main cable steel wire twisting, stringing and drumming, and improves the main cable control level.

[0032] The main cable pre-tensioning method of the present application is simple to operate. By acquiring the full-range temperature data of the main cable's internal temperature in real time, the accuracy of the measurement data can be improved. The real-time acquired minimum temperature difference data inside and outside the main cable can improve the quality of the pre-tensioning operation, reduce the probability of main cable steel wire twisting, stringing and drumming, and greatly improve the main cable control level. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 : Schematic diagram of the main cable section of this application;

[0034] Among them: 1-main cable strand; 2-temperature optical fiber; 3-temperature sensor. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0036] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] The present application relates to a main cable pre-tensioning method based on the real-time temperature of the entire main cable. The main cable pre-tensioning method of the present application is a judgment method used during the pre-tensioning operation of the main cable strands. The internal temperature and external temperature of the main cable to be pre-tensioned are collected, and the external temperature and the internal temperature are compared to determine whether the internal and external temperature difference requirements are met. The pre-tensioning operation is performed when the temperature difference requirements are met, and the pre-tensioning operation is not performed when the temperature difference requirements are not met. By acquiring the internal and external temperature data in real time in this way, the full-domain temperature data of the internal and external temperatures of the main cable can be acquired in real time, which can improve the accuracy of the measurement data. The real-time acquired internal and external temperature difference data of the main cable can improve the quality of the pre-tensioning operation, reduce the probability of twisting, stringing and drumming of the main cable steel wires, and improve the control level of the main cable.

[0040] Specifically, Figure 1 As shown, the main cable pre-tightening method based on the global real-time temperature of the main cable of the present application is performed according to the following steps:

[0041] S1. When manufacturing the main cable, select a number of main cable strands 1 to install the temperature optical fiber 2. The temperature optical fiber 2 is arranged along the entire length of the main cable strand 1 and multiple temperature grating measuring points are evenly spaced along the length direction of the temperature optical fiber 2.

[0042] The main cable includes a plurality of main cable strands 1. When the main cable is manufactured, the temperature optical fiber 2 is implanted into the main cable strands 1. When the main cable is subsequently assembled, the temperature optical fiber 2 is protected by the main cable strands 1 and is not easily damaged.

[0043] S2. When assembling the main cable, install the main cable strands 1 in place according to the set position, so that the main cable strands 1 with the temperature optical fibers 2 installed are spaced apart in the radial direction of the main cable section;

[0044] A plurality of main cable strands 1 with temperature optical fibers 2 implanted therein are arranged inside the main cable. The plurality of temperature optical fibers 2 are arranged at intervals along the radial direction of the main cable section. The temperature optical fibers 2 at different positions can collect the temperature at different positions inside the main cable. By setting up a plurality of temperature optical fibers 2, the temperature conditions at different positions on the internal section of the main cable can be obtained, and the temperature conditions inside the main cable can be accurately judged and analyzed.

[0045] The temperature optical fiber 2 is arranged along the entire length of the main cable, and a plurality of temperature grating measuring points are arranged on the temperature optical fiber 2. A single temperature optical fiber 2 can measure the temperature conditions at different positions along the axial direction of the main cable. In summary, the temperature optical fiber 2 arranged inside the main cable in the present application can intensively collect the temperature inside the main cable, and more comprehensively grasp the temperature distribution inside the main cable.

[0046] S3. Before pre-tightening the main cable, a temperature sensor 3 is arranged on the outside of the main cable;

[0047] The temperature sensor 3 is used to collect the temperature outside the main cable in real time. The temperature sensor 3 corresponds to the temperature optical fiber 2. The temperature sensor 3 can be an electronic temperature sensor 3, which can be adjusted according to the pre-tightening position of the main cable.

[0048] S4, collecting the internal temperature of the main cable based on the temperature optical fiber 2, and collecting the surface temperature of the main cable based on the temperature sensor 3; when the temperature difference between the internal temperature of the main cable and the surface temperature of the main cable is within a set range, pre-tightening the main cable;

[0049] Repeat the operation in sequence until all positions of the main cable are pre-tightened.

[0050] In some embodiments of the present application, this embodiment optimizes the above step S1. Specifically, Figure 1As shown, the method of selecting several main cable strands 1 to install the temperature optical fiber 2 is: select several main cable strands 1, and implant the temperature optical fiber 2 into the center of the main cable strand 1 along the axial direction of the main cable strand 1. There are many ways to implant the temperature optical fiber 2 into the main cable strand 1. A full-length steel pipe can be arranged at the center of the main cable strand 1, and the temperature optical fiber 2 can be inserted into the steel pipe. The temperature optical fiber 2 can also be directly braided into the steel wire of the main cable strand 1. As long as the requirement of obtaining the internal temperature of the main cable in real time can be met.

[0051] Furthermore, the method for installing the main cable strand 1 in place according to the set position includes: arranging a main cable strand 1 implanted with temperature optical fiber 2 at the center of the main cable, arranging at least one circle of main cable strand 1 implanted with temperature optical fiber 2 around the main cable axis with the main cable axis as the center, and each circle includes a plurality of main cable strands 1 implanted with temperature optical fiber 2 arranged at equal intervals in the circumferential direction of the main cable section.

[0052] This embodiment requires that the temperature of different sections of the main cable can be collected in real time, so it is necessary to arrange temperature optical fibers 2 at different sections of the main cable, including a temperature optical fiber 2 at the center of the main cable, and a plurality of temperature optical fibers 2 arranged at intervals along the radial direction, each group including a plurality of temperature optical fibers 2 arranged at equal intervals along the circumference of the main cable with the main cable axis as the center. Figure 1 As shown, this embodiment is a circle of temperature optical fiber 2 groups, including six temperature optical fibers 2, plus the temperature optical fiber 2 at the center of the main cable, a total of seven temperature optical fibers 2, that is, on the cross section of the main cable, 7 temperature values ​​can be collected simultaneously. In practical application, it is not limited to a circle of temperature optical fiber 2 groups, it can be multiple circles of temperature optical fiber 2 groups, and two adjacent circles of temperature optical fiber 2 groups are distributed radially. In particular, for a main cable with a relatively large cross-sectional structure, multiple circles of temperature optical fiber 2 groups can be used to collect internal temperature.

[0053] In other embodiments of the present application, this embodiment optimizes the above-mentioned step S3, and the temperature sensor 3 of this embodiment corresponds to the temperature optical fiber 2 measuring point on the temperature optical fiber 2, that is, a plurality of temperature sensors 3 equidistantly distributed along the circumferential direction are arranged outside the circumference of the main cable corresponding to the temperature grating measuring point of the temperature optical fiber 2.

[0054] The temperature sensor 3 can be designed as a movable structure. For example, when a certain position of the main cable needs to be pre-tightened, the main cable section at that position includes a temperature grating measuring point and a temperature sensor 3. Then, when the next position needs to be pre-tightened, the temperature sensor 3 can be moved to the next section to correspond to the temperature grating measuring point on the next section. The temperature grating measuring points on the temperature optical fiber 2 of this embodiment are evenly arranged at intervals of 1m along the length direction.

[0055] In a preferred embodiment of the present application, this embodiment optimizes the above-mentioned step S4. Specifically, the temperature optical fiber 2 inside the main cable is connected to the optical fiber demodulator for signal connection. The signal collected by the temperature optical fiber 2 will be transmitted to the optical fiber demodulator, and then these signals will be processed to obtain the temperature value.

[0056] For example, when a judgment is needed on a main cable section, the internal average temperature of the section is calculated based on the temperatures collected by the temperature grating measuring points on all the temperature optical fibers 2 in the section; the external average temperature of the section is calculated based on the temperatures collected by all the temperature sensors 3 at the section; the difference between the internal average temperature and the external average temperature is calculated; if the difference does not exceed the set threshold, the main cable of the section is pre-tightened, otherwise the main cable of the section is not pre-tightened.

[0057] Assume that it is necessary to determine whether the i-th section of the main cable can be pre-tightened, based on the temperature values ​​collected by the temperature grating measuring points on all temperature optical fibers 2 of the i-th section, that is, T 内i1 ~T 内in , assuming that there are n temperature optical fibers 2 inside the main cable, the average temperature calculation formula of the i-th section of the current main cable is as follows:

[0058]

[0059] Where: T 内i ——the average internal temperature of the i-th section of the main cable;

[0060] T 内ij ——The temperature monitored by the jth temperature grating measuring point at the i-th section of the main cable;

[0061] n is the number of temperature grating measuring points at the i-th section of the main cable.

[0062] Assume that m temperature sensors 3 are arranged outside the circumference of the main cable at the i-th section, and the external average temperature of the i-th section of the main cable is obtained based on the m temperature sensors 3. The temperature collected by the m temperature sensors 3 on the i-th section of the main cable is T 外i1 ~T 外im , then the external average temperature calculation formula at the i-th section of the main cable is as follows:

[0063]

[0064] Where: T 外i ——the average external temperature of the i-th section of the main cable;

[0065] T 外ij ——The temperature monitored by the jth temperature sensor 3 at the i-th section of the main cable;

[0066] m——the number of temperature sensors 3 at the i-th section of the main cable.

[0067] Based on the average internal temperature T of the i-th section of the main cable 内i and the external average temperature T of the i-th section of the main cable 外i Calculate the temperature difference T 外i -T 内i =T α , if T α ≤ a set threshold (the set threshold in the present embodiment is 2°C, but is not limited to this value and may be other values ​​as long as the actual demand is met), then it is judged that the current temperature difference is appropriate and the main cable of the section can be pre-tightened; otherwise, the main cable of the section cannot be pre-tightened.

[0068] In actual operation, when manufacturing the main cable, several main cable strands 1 are selected to install the temperature optical fiber 2, and the temperature optical fiber 2 is implanted into the center position of the main cable strand 1 along the axial direction of the main cable strand 1; when assembling the main cable, the main cable strand 1 is installed in place according to the set position, and at least one circle of main cable strands 1 implanted with the temperature optical fiber 2 is arranged around the main cable axis with the main cable axis as the center, and each circle includes several main cable strands 1 implanted with the temperature optical fiber 2 arranged at equal intervals along the circumferential direction of the main cable section; a plurality of temperature sensors 3 distributed at equal intervals along the circumferential direction are arranged outside the circumference of the main cable corresponding to the temperature grating measuring points of the temperature optical fiber 2; the internal average temperature of a section is calculated based on the temperatures collected by the temperature grating measuring points on all the temperature optical fibers 2 in the section; the external average temperature of the section is calculated based on the temperatures collected by all the temperature sensors 3 at the section; the difference between the internal average temperature and the external average temperature is calculated; if the difference does not exceed the set threshold, the main cable of the section is pre-tightened, otherwise the main cable of the section is not pre-tightened.

[0069] In addition, the present application also relates to a main cable pretensioning cable system based on the real-time temperature of the entire main cable, including an internal temperature acquisition module, an external temperature acquisition module and a control module, the internal temperature acquisition module including a plurality of temperature optical fibers 2 implanted in the main cable strand 1, the temperature optical fibers 2 being arranged along the entire length of the main cable strand 1 and a plurality of temperature grating measuring points being evenly spaced along the length direction of the temperature optical fibers 2; the external temperature acquisition module including a plurality of temperature sensors 3 arranged outside the circumference of the main cable; the control module being used to compare the internal temperature of the main cable acquired by the internal temperature acquisition module with the internal temperature of the main cable acquired by the temperature sensor 3, and making a judgment that the main cable can be pretensioned when the temperature difference between the two is within a set range, and making a judgment that the main cable cannot be pretensioned when the temperature difference between the two is not within the set range.

[0070] The internal temperature acquisition module includes a temperature optical fiber 2 in the main cable strand 1 located at the center of the main cable and at least one circle of two temperature optical fibers centered on the main cable axis. Each group includes multiple temperature optical fibers 2 arranged at equal intervals along the circumference of the main cable section centered on the main cable axis.

[0071] The temperature sensor 3 and the temperature grating measuring point on the corresponding temperature optical fiber 2 are located on the same section of the main cable.

[0072] A plurality of temperature sensors 3 are arranged at equal intervals along the circumferential direction of the main cable section.

[0073] The control module includes an internal average temperature acquisition module, an external average temperature acquisition module, a temperature difference acquisition module and a judgment module. The internal average temperature acquisition module calculates the internal average temperature of a section of the main cable according to the temperature obtained by the temperature grating measuring point on the section; the external average temperature acquisition module calculates the external average temperature of the section of the main cable according to the temperature obtained by all temperature sensors 3 on the section; the temperature difference acquisition module obtains the temperature difference between the internal average temperature and the external average temperature based on the internal average temperature and the external average temperature; the judgment module is used to compare the temperature difference with a set threshold, and make a judgment that the main cable can be pre-tightened when the temperature difference does not exceed the set threshold, and make a judgment that the main cable cannot be pre-tightened when the temperature difference exceeds the set threshold.

[0074] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

Claims

1. A main cable pre-tightening method based on the global real-time temperature of the main cable, characterized in that: include, When manufacturing the main cable, select several main cable strands to install temperature optical fibers, the temperature optical fibers are arranged along the entire length of the main cable strands, and multiple temperature grating measuring points are evenly spaced along the length direction of the temperature optical fibers; When assembling the main cable, the main cable strands are installed in place according to the set position, so that the main cable strands installed with temperature optical fibers are distributed at intervals in the radial direction of the main cable section; Before pre-tensioning the main cable, a temperature sensor is arranged on the outside of the main cable; The internal temperature of the main cable is collected based on the temperature optical fiber, and the surface temperature of the main cable is collected based on the temperature sensor; when the temperature difference between the internal temperature of the main cable and the surface temperature of the main cable is within the set range, the main cable is pre-tightened; Repeat the operation in sequence until all positions of the main cable are pre-tightened.

2. A main cable pre-tightening method based on the global real-time temperature of the main cable according to claim 1, characterized in that: The method for selecting a plurality of main cable strands to install temperature optical fibers comprises: selecting a plurality of main cable strands, and implanting the temperature optical fibers into the center positions of the main cable strands along the axial direction of the main cable strands.

3. A main cable pre-tightening method based on the global real-time temperature of the main cable according to claim 1, characterized in that: The method for installing the main cable strands in place according to the set position includes: arranging a main cable strand implanted with temperature optical fiber at the center position of the main cable, arranging at least one circle of main cable strands implanted with temperature optical fiber around the main cable axis with the main cable axis as the center, and each circle includes a plurality of main cable strands implanted with temperature optical fiber arranged at equal intervals in the circumferential direction of the main cable section.

4. A main cable pre-tightening method based on the global real-time temperature of the main cable according to claim 1, characterized in that: The method for arranging temperature sensors outside the main cable comprises: arranging a plurality of temperature sensors equidistantly distributed along the circumference outside the main cable corresponding to the temperature grating measuring points of the temperature optical fiber.

5. A main cable pre-tightening method based on the global real-time temperature of the main cable according to claim 1, characterized in that: The internal average temperature of a section is calculated based on the temperatures collected by the temperature grating measuring points on all temperature optical fibers in the section; the external average temperature of the section is calculated based on the temperatures collected by all temperature sensors at the section; the difference between the internal average temperature and the external average temperature is calculated; if the difference does not exceed the set threshold, the main cable of the section is pre-tightened, otherwise the main cable of the section is not pre-tightened.

6. A main cable pre-tensioning system based on the real-time temperature of the entire main cable, characterized in that: The cable tightening system is operated according to any one of the main cable pre-tightening methods based on the global real-time temperature of the main cable as described in claims 1 to 5, including: An internal temperature acquisition module, the internal temperature acquisition module comprising a plurality of temperature optical fibers implanted in the main cable strands, the temperature optical fibers being arranged along the entire length of the main cable strands and having a plurality of temperature grating measurement points evenly spaced along the length direction of the temperature optical fibers; An external temperature acquisition module, the external temperature acquisition module comprising a plurality of temperature sensors arranged outside the circumference of the main cable; A control module, wherein the control module is used to compare the internal temperature of the main cable collected by the internal temperature collection module with the internal temperature of the main cable collected by the temperature sensor, and to make a judgment that the main cable can be pre-tightened when the temperature difference between the two is within a set range, and to make a judgment that the main cable cannot be pre-tightened when the temperature difference between the two is not within the set range.

7. A main cable pre-tensioning system based on the global real-time temperature of the main cable according to claim 6, characterized in that: The internal temperature acquisition module includes a temperature optical fiber located in the main cable strand at the center of the main cable and at least one circle of temperature optical fiber group centered on the main cable axis, each group includes multiple temperature optical fibers arranged at equal intervals along the circumference of the main cable section centered on the main cable axis.

8. A main cable pre-tensioning system based on the global real-time temperature of the main cable according to claim 6, characterized in that: The temperature sensor and the temperature grating measuring point on the corresponding temperature optical fiber are located on the same section of the main cable.

9. A main cable pre-tensioning system based on the global real-time temperature of the main cable according to claim 8, characterized in that: The plurality of temperature sensors are arranged at equal intervals along the circumferential direction of the main cable section.

10. A main cable pre-tensioning system based on the global real-time temperature of the main cable according to claim 6, characterized in that: The control module comprises: An internal average temperature acquisition module, which calculates the internal average temperature of a section of the main cable according to the temperature obtained by a temperature grating measuring point on the section of the main cable; An external average temperature acquisition module, which calculates the external average temperature of the section of the main cable according to the temperatures obtained by all temperature sensors on the section; A temperature difference acquisition module, wherein the temperature difference acquisition module acquires the temperature difference between the internal average temperature and the external average temperature based on the internal average temperature and the external average temperature; The judgment module is used to compare the temperature difference with a set threshold value, and make a judgment that the main cable can be pre-tightened when the temperature difference does not exceed the set threshold value, and make a judgment that the main cable cannot be pre-tightened when the temperature difference exceeds the set threshold value.

Images