A method for automatically correcting deviation of a cable tower in a bridge construction process

Abstract

The application belongs to the technical field of bridge construction, and provides a cable tower automatic deviation rectification method in a bridge construction process. In the bridge construction process, the deformation of the cable tower is detected in real time, and the extension and contraction states of the buckling cables on both sides of the cable tower are adjusted in real time according to the deformation, so that the deformation value of the cable tower is always within a preset deformation range, the perpendicularity of the cable tower and the force balance on both sides of the cable tower in the bridge construction process are ensured, and the problem of construction risk caused by the deviation of the cable tower is solved. Meanwhile, in the process of adjusting the extension and contraction of the buckling cables on both sides of the cable tower, the force conditions of all the buckling cables are detected and controlled in real time, so that the forces of all the buckling cables are within the corresponding preset force range, the problem of large deviation between the actual force and the design force of the buckling cables is avoided, and the problem of premature failure of the buckling cables in the later bridge use process is solved. The whole adjustment process is integrated into the bridge construction process, the construction period is reduced, and the construction progress is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge construction, and particularly relates to a cable tower automatic deviation rectification method in a bridge construction process. BACKGROUND

[0002] In recent years, long-span bridges have been rapidly developed, and most of the main arch installations adopt the cable hoisting and cable-stayed hanging method without support, except for a few that adopt the swivel construction method and the overall lifting method. The cable-stayed hanging system usually adopts cable or prestressed steel strand as a cable, which is connected to the construction segment on one side and anchored on the anchorage on the other side.

[0003] The inventor finds that the cable tower is the key to the realization of the cable-stayed hanging system, and in order to maintain the force balance of the cable tower in the horizontal direction and control the deformation of the cable tower, the anchoring force on both sides of the cable tower needs to be manually adjusted during the construction process, which is not easy to achieve the balance of the cable tower on both sides, thereby affecting the deviation of the cable tower and causing construction risks. The adjustment process of the anchoring force on both sides of the cable tower is long, which affects the construction progress. When adjusting the anchoring force on both sides of the cable tower, only the adjustment of the stress and deformation of the cable tower is considered, and the stress condition of the cable during the adjustment of the stress and deformation of the cable tower is ignored, which causes a large deviation between the actual stress and the designed stress of the cable at different positions, and the cable fails prematurely during the later use of the bridge, which affects the service life of the cable and the entire bridge. SUMMARY

[0004] In order to solve the above problems, the application provides a cable tower automatic deviation rectification method in a bridge construction process, which ensures the perpendicularity of the cable tower and the force balance on both sides of the cable tower during the bridge construction process, solves the problem of construction risks caused by the deviation of the cable tower, avoids the problem of a large deviation between the actual stress and the designed stress of the cable, solves the problem of premature failure of the cable during the later use of the bridge, and improves the service life of the cable and the entire bridge.

[0005] In order to achieve the above purpose, the application is implemented by the following technical scheme:

[0006] The application provides a cable tower automatic deviation rectification method in a bridge construction process, which comprises:

[0007] Real-time acquisition of the deformation condition of the cable tower in the bridge construction process;

[0008] According to the deformation condition of the cable tower, the extension and contraction states of the cables on both sides of the cable tower are adjusted, so that the deformation value of the cable tower is always within a preset deformation range. During the adjustment of the extension and contraction of the cables on both sides of the cable tower, the stress conditions of all the cables are monitored and controlled in real time, so that the stresses of all the cables are within the corresponding preset stress range.

[0009] Further, the horizontal deformation of the cable tower is detected in real time by a Beidou deformation sensor installed on the top of the cable tower; and the corresponding cable stretching state is adjusted according to the size and direction of the horizontal deformation of the cable tower.

[0010] Further, when the cable stretching state is adjusted, the force of the cable is detected in real time by a force sensor arranged on the cable; and when the force of the cable exceeds a preset force range, the adjustment is stopped or an alarm is given.

[0011] Further, a plurality of stress sensors are arranged at different positions in the vertical direction of the cable tower, and are used for detecting the stress values at different positions of the cable tower.

[0012] Further, when the cable stretching state is adjusted, a plurality of cables on the same side of the cable tower are adjusted simultaneously; and when the force of one of the cables exceeds the preset force range, the adjustment of the cable whose force exceeds the preset force range is stopped.

[0013] After the adjustment of the cable whose force exceeds the preset force range is stopped, if the deformation of the cable tower is not adjusted, the adjustment is continued by increasing the adjustment intensity of the adjacent cable to the cable whose force exceeds the preset force range; otherwise, the adjustment of all cables is stopped.

[0014] Further, during the adjustment, the stress values at different positions of the cable tower are detected in real time, and the adjustment intensity of the cable at the position where the stress value changes most is increased.

[0015] Further, when the stress value is greater than a preset stress value, an alarm is given.

[0016] Further, during the adjustment of the stretching of the cables on both sides of the cable tower, the force difference of the cables on both sides of the same horizontal plane of the cable tower is compared, so that the force difference is within a preset force difference range.

[0017] Further, the adjustment of the cables whose force difference exceeds the preset force difference range at the same horizontal position is stopped, and the adjustment intensity of the cables at the adjacent horizontal position is increased.

[0018] Further, a jack is arranged on each cable, and the stretching of the cable is adjusted according to the deformation of the cable tower.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The application can detect the deformation of the cable tower in real time during the bridge construction process, and adjust the extension and contraction state of the buckling cables on both sides of the cable tower in real time according to the deformation, so that the deformation value of the cable tower is always within the preset deformation range, and the perpendicularity of the cable tower and the stress balance on both sides of the cable tower during the bridge construction process are ensured, the problem of construction risk caused by the deviation of the cable tower is solved, and the stress of all buckling cables is detected and controlled in real time during the adjustment of the extension and contraction of the buckling cables on both sides of the cable tower, so that the stress of all buckling cables is within the corresponding preset stress range, the problem of large deviation between the actual stress and the design stress of the buckling cable is avoided, the problem of premature failure of the buckling cable in the later bridge use process is solved, and the service life of the buckling cable and the whole bridge is improved; the whole adjustment process is integrated into the bridge construction process, the construction period is reduced, and the construction progress is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying this specification are included to provide a further understanding of the embodiments of the application. The embodiments of the application and a preferred mode of its implementation embodying features of the application are intended to be illustrative only and not limiting of the application as construed in accordance with the appended claims.

[0022] Figure 1 Flow chart of embodiment 1 of the application;

[0023] Figure 2 Schematic diagram of cable tower structure of embodiment 1 of the application;

[0024] Figure 3 Schematic diagram of device structure of embodiment 1 of the application;

[0025] 1, cable tower; 2, buckling cable; 3, Beidou deformation sensor; 4, stress sensor; 5, tension sensor; 6, jack. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the drawings and embodiments.

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0028] Embodiment 1:

[0029] As Figure 2As shown, during bridge construction, in order to maintain the horizontal force balance of pylon 1 and control its deformation, the anchoring forces on both sides of pylon 1 need to be manually adjusted. Achieving balance on both sides of pylon 1 is not easy, which can lead to pylon 1 misalignment and construction risks. The adjustment process for the anchoring forces on both sides of pylon 1 is time-consuming and affects the construction progress. Furthermore, when adjusting the anchoring forces on both sides of pylon 1, only the force and deformation of pylon 1 are considered, while the force on the tie cable 2 is ignored. This results in a large deviation between the actual force on tie cable 2 at different locations and the designed force, leading to premature failure of tie cable 2 during later bridge use, affecting the service life of tie cable 2 and the entire bridge.

[0030] It should be noted that the anchoring force can be understood as the tension of the cable 2 on the tower 1; the cable 2 is divided into the cable 2 connected to the construction segment and the cable 2 anchored to the anchorage, and the cable 2 can also be called the anchor cable; Figure 2 In the original drawing, only one cable 2 is depicted on each side of the tower 1. However, in reality, multiple cables 2 are distributed at different horizontal positions on the tower 1. This is obvious to those skilled in the art and will not be described in detail here. Figure 2 Draw in the middle.

[0031] It should also be noted that during bridge construction, factors such as the dryness of construction materials and minor deformations can affect the stability of the bridge body and tower 1 at any time. Throughout the entire construction process, the bridge body and tower 1 are in a state of stabilization. Therefore, real-time correction of tower 1 during construction can ensure its stability after construction and improve the safety of the bridge in the later use. If tower 1 cannot be corrected in real time during bridge construction, even if tower 1 has minor deformations after the bridge is completed, it will have a significant impact on the safety of the bridge in the later operation. Furthermore, if the tension on cable 2 is too high after bridge construction, it will cause premature failure of cable 2, affecting the service life of the bridge. On the other hand, if the tension on one or more cable 2 is too low, although it will not affect the service life of the cable 2 itself, it will change the distribution of the overall anchoring force on the tower 1, causing it to deviate from the designed structure. At the same time, during the later use of the bridge, the tension on other cable 2 will be increased to compensate for the cable 2 with lower tension, which will also affect the service life of cable 2 and the bridge. Therefore, controlling the tension on cable 2 during the early construction stage of the bridge is particularly important for the safety and service life of the bridge in the later use.

[0032] In summary, to ensure the stress balance and verticality of pylon 1 during bridge construction, and to ensure the stress condition of cable 2, as follows: Figure 1 As shown in the figure, this embodiment provides a method for automatic tower correction during bridge construction, including:

[0033] Real-time acquisition of the deformation of pylon 1 during bridge construction;

[0034] Based on the deformation of the cable tower 1, the extension and retraction of the buckles 2 on both sides of the cable tower 1 are adjusted so that the deformation value of the cable tower 1 is always within the preset deformation range; during the adjustment of the extension and retraction of the buckles 2 on both sides of the cable tower 1, the stress of all buckles 2 is detected and controlled in real time so that the stress of all buckles 2 is within the corresponding preset stress range.

[0035] The telescopic state can be understood as adjusting the length of the cable 2 by stretching or other means; the preset deformation range can be obtained from the previous bridge design data or experimental data, and can be understood as the range within which the tower 1 is allowed to deform while ensuring safety; the preset stress range can be the stress value of the cable 2 during the previous bridge design, and it can be understood that the preset stress range of the cable 2 is different at different locations and on different sides.

[0036] Specifically, during bridge construction, the deformation of the pylon 1 is monitored in real time, and the expansion and contraction of the tie cables 2 on both sides of the pylon 1 are adjusted accordingly. This ensures that the deformation of the pylon 1 remains within a preset range, guaranteeing the verticality of the pylon 1 and the balance of forces on both sides during construction, thus resolving the construction risks caused by the misalignment of the pylon 1. Simultaneously, during the adjustment of the expansion and contraction of the tie cables 2 on both sides of the pylon 1, the forces on all tie cables 2 are monitored and controlled in real time, ensuring that the forces on all tie cables 2 are within their corresponding preset ranges. This avoids significant deviations between the actual and designed forces on the tie cables 2, preventing premature failure of the tie cables 2 during later bridge use and extending the service life of the tie cables 2 and the entire bridge. The entire adjustment process is integrated into the bridge construction process, reducing the construction cycle and ensuring construction progress.

[0037] like Figure 2 As shown, the horizontal deformation of the cable tower 1 can be detected in real time by the Beidou deformation sensor 3 installed on the top of the cable tower 1. The extension and retraction states of the corresponding fasteners 2 can be adjusted according to the magnitude and direction of the horizontal deformation of the cable tower 1. For example, if the cable tower 1 is detected to be tilting to one side, the fasteners 2 on the other side can be contracted to bring the cable tower 1 back to a vertical position, thus achieving automatic correction of the cable tower 1. In this embodiment, the Beidou deformation sensor 3 is a Beidou deformation monitoring device, which can monitor the deformation of the cable tower 1, such as its tilt. In other embodiments, tilt sensors distributed at different positions in the vertical direction of the cable tower 1 can also be used to detect the degree of deformation at different positions, facilitating the determination of the deformation of the cable tower 1 at different locations.

[0038] In order to avoid the problem of excessive or insufficient force on the corresponding cable 2 in the automatic deviation correction process of the cable tower 1, the force on the cable 2 can be detected in real time by the tension sensor 5 arranged on the cable 2 when adjusting the extension and contraction state of the cable 2, and the adjustment is stopped or an alarm is given when the force on the cable 2 exceeds the preset force range, thereby avoiding the problem of excessive or insufficient force on the cable 2.

[0039] It can be understood that the tension sensor 5 is arranged on each cable 2 separately, and the jack 6 is installed on all cables 2, which is used to adjust the extension and contraction of the cable 2 according to the deformation of the cable tower 1. The preset force range can be set as a range value composed of two numerical values, and the force on the cable 2 exceeding the preset force range can be due to the excessive force on the cable 2 exceeding the maximum value of the preset force range, or due to the insufficient force on the cable 2 exceeding the minimum value of the preset force range.

[0040] In order to avoid the problem of excessive or insufficient force on the corresponding cable 2 in the automatic deviation correction process of the cable tower 1, the force on the cable 2 can be detected in real time by the tension sensor 5 arranged on the cable 2 when adjusting the extension and contraction state of the cable 2, and the adjustment is stopped or an alarm is given when the force on the cable 2 exceeds the preset force range, thereby avoiding the problem of excessive or insufficient force on the cable 2.

[0041] After stopping the adjustment of the cable 2 with force exceeding the preset force range, if the deformation of the cable tower 1 is not adjusted, that is, the deformation of the cable tower 1 is still outside the preset deformation range, the adjustment is continued by increasing the adjustment intensity of the cable adjacent to the cable 2 with force exceeding the preset force range, and the automatic deviation correction of the cable tower 1 is continued by increasing the adjustment intensity of the cable adjacent to the cable 2 with force exceeding the preset force range, thereby solving the control contradiction between the automatic deviation correction of the cable tower 1 and the force adjustment of the cable 2. Of course, after stopping the adjustment of the cable 2 with force exceeding the preset force range, if the deformation of the cable tower 1 is adjusted, that is, the deformation of the cable tower 1 is not outside the preset deformation range, otherwise the adjustment of all cables 2 is stopped.

[0042] In the actual construction process of the bridge, the cable tower 1 will be affected by factors such as construction precision, materials, and different position cable 2 providing different tension, in addition to the overall deformation of the cable tower 1, the cable tower 1 will also appear deformation prominent problem in one or several positions, at this time, in order to focus on the deformation prominent position for key adjustment, in the embodiment, the stress value of the cable tower 1 at different positions is detected in real time during the adjustment process, and the adjustment intensity of the cable 2 at the position with the largest stress value change is strengthened.

[0043] It can be understood that the position with the largest stress value change is the position of the cable tower 1 with prominent deformation, at this time, the adjustment intensity of the cable 2 at the position with the largest stress value change is strengthened, which can realize targeted adjustment and ensure the overall perpendicularity of the cable tower 1. When the stress value is greater than the preset stress value, an alarm is given. The preset stress value can be obtained from the design data or experimental data in the early stage. When the stress value is greater than the preset stress value, the internal structure of the cable tower 1 will be damaged, so timely alarm is helpful to remind the construction personnel to check in time and avoid damage to the internal structure of the cable tower 1, thereby improving the service life of the bridge in the later period.

[0044] Specifically, as shown in Figure 2 The stress value can be detected by arranging a stress sensor 4 on the cable tower 1. It can be understood that a plurality of stress sensors 4 are arranged at different positions in the vertical direction of the cable tower 1.

[0045] Although the tension of the cable 2 on both sides of the cable tower 1 is inconsistent, in the entire bridge structure, in order to ensure the stability of the cable tower 1, the size of the tension of the cable 2 at different positions on both sides of the cable tower 1 is designed before construction; in order to ensure the stability of the cable tower 1, during the adjustment of the extension and contraction of the cable 2 on both sides of the cable tower 1, by comparing the stress difference of the cable 2 on both sides of the same horizontal plane of the cable tower 1, the stress difference is located in the preset difference range, the influence of the adjustment of the cable 2 on the stability of the cable tower 1 is reduced; at the same time of stopping the adjustment of the two cables 2 at the same horizontal position whose stress difference exceeds the preset difference range, in order to meet the demand of continuous deviation correction of the cable tower 1, the adjustment intensity of the cable 2 at the adjacent horizontal position is strengthened, and the automatic deviation correction of the cable tower 1 is completed.

[0046] In order to realize the automatic deviation correction method of the cable tower in the bridge construction process, as shown in Figure 3 In the embodiment, a kind of automatic deviation correction device of cable tower in bridge construction process is also provided, including central control system, beidou deformation control system, cable tower deformation control system and safety early warning system. The central control system can be as system core, responsible for realizing the real-time control of other three systems, specifically can include beidou deformation sensor 3, tension sensor 5, stress sensor 4 and jack 6.

[0047] The Beidou deformation control system can be responsible for collecting and processing the deformation data of the cable tower 1 collected by the Beidou deformation sensor 3, which can be arranged at the top of the cable tower and connected with the Beidou global displacement navigation system, so as to realize accurate identification of the horizontal deformation of the cable tower 1.

[0048] The cable tower deformation control system can be responsible for collecting the data of the tension sensor 5 and controlling the jack 6 to realize tensioning and unloading of the cable 2.

[0049] The safety warning system can be responsible for safety control during cable hoisting, and is connected with the Beidou deformation sensor 3, the tension sensor 5 and the stress sensor 4, and sequentially controls the deformation of the cable tower 1, the tension of the cable 2 and the stress of the cable tower 1, so as to realize all-round real-time monitoring of all risk sources.

[0050] The method of the automatic deviation correction device of the cable tower during the bridge construction process comprises:

[0051] The Beidou deformation sensor 3 is arranged at the top of the cable tower 1, the tension sensor 5 is arranged through the cable 2 between the jack 6 and the tensioning reaction seat, a plurality of stress sensors 4 are arranged along the height of the cable tower 1, and the central control system, the Beidou deformation control system, the cable tower deformation control system and the safety warning system are debugged.

[0052] During the cable hoisting process, the Beidou deformation sensor 3 collects the horizontal deformation of the top of the cable tower 1 and transmits it to the Beidou displacement control system, so as to realize real-time analysis, reading and display of the deformation data.

[0053] The deformation data of the top of the cable tower 1 is synchronously transmitted to the cable tower deformation control system, which transmits signals to the tension sensor 5 according to the direction and size of the deformation and controls the jack 6 to realize tensioning or unloading, so as to realize real-time regulation and control of the deformation of the cable tower 1 and ensure that the deformation range is within a controllable range. The tension sensor 5 displays the tension value of the cable 2 in real time.

[0054] The deformation, tension and stress data collected by the Beidou deformation sensor 3, the tension sensor 5 and the stress sensor 4 are transmitted to the safety warning system in real time, the safety warning system performs automatic analysis and display, and sets a safety threshold to alarm in real time when the safety risk exceeds the limit.

[0055] The embodiment realizes the implementation monitoring and regulation of the deformation of the cable tower 1 in the cable hoisting process through intelligent control, saves the construction time of human control of the cable tensioning force, reduces the construction error, guarantees the safety of the construction process, improves the intelligent level of the project, and greatly improves the construction quality and work efficiency, and has wide popularization prospect.

[0056] The above only provides the preferred embodiments of the present embodiment and is not used to limit the present embodiment. The present embodiment can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A method for automatically correcting deviation of a cable tower in a bridge construction process, characterized in that, The application relates to a cable-stayed bridge deformation monitoring and adjusting system. Real-time acquisition of the deformation of a cable tower in a bridge construction process; According to the deformation of the cable tower, the extension and contraction states of the buckling cables on the two sides of the cable tower are adjusted, so that the deformation value of the cable tower is always within a preset deformation range; During the adjustment of the extension and contraction of the buckling cables on the two sides of the cable tower, the stress conditions of all the buckling cables are detected and controlled in real time, so that the stress of all the buckling cables is within the corresponding preset stress range; The horizontal deformation of the cable tower is detected in real time by a Beidou deformation sensor installed on the top of the cable tower; the extension and contraction states of the corresponding buckling cables are adjusted according to the size and direction of the horizontal deformation of the cable tower; During the adjustment of the extension and contraction states of the buckling cables, the stress of the buckling cables is detected in real time by a stress sensor arranged on the buckling cables; when the stress of the buckling cables exceeds the preset stress range, the adjustment is stopped or an alarm is given.

2. The method for automatic deviation correction of a cable tower in a bridge construction process according to claim 1, characterized in that, During the adjustment of the extension and contraction states of the buckling cables, the stresses of the buckling cables on the same side of the cable tower are adjusted simultaneously; when the stress of one of the buckling cables exceeds the preset stress range, the adjustment of the buckling cable with the stress exceeding the preset stress range is stopped; After the adjustment of the buckling cable with the stress exceeding the preset stress range is stopped, if the deformation of the cable tower is not adjusted, the adjustment is continued by increasing the adjustment intensity of the buckling cables adjacent to the buckling cable with the stress exceeding the preset stress range; otherwise, the adjustment of all the buckling cables is stopped.

3. The method for automatic deviation correction of a cable tower in a bridge construction process according to claim 2, characterized in that, During the adjustment, the stress values of different positions of the cable tower are detected in real time, and the adjustment intensity of the buckling cables at the position with the maximum stress value change is increased.

4. The method for automatic deviation correction of a cable tower in a bridge construction process according to claim 3, characterized in that, When the stress value is greater than a preset stress value, an alarm is given.

5. The method for automatic deviation correction of a cable tower in a bridge construction process according to claim 3, characterized in that, A plurality of stress sensors are arranged at different positions in the vertical direction of the cable tower and are used for detecting the stress values of different positions of the cable tower.

6. The method for automatic deviation correction of a cable tower in a bridge construction process according to claim 1, characterized in that, During the adjustment of the extension and contraction of the buckling cables on the two sides of the cable tower, the stress difference of the buckling cables on the two sides of the same horizontal plane of the cable tower is compared, so that the stress difference is within a preset difference range.

7. The method for automatic deviation correction of a pylon in a bridge construction process according to claim 6, characterized in that, The adjustment of the two buckling cables at the same horizontal position with the stress difference exceeding the preset difference range is stopped, and the adjustment intensity of the buckling cables at the adjacent horizontal position is increased.

8. The method for automatic deviation correction of a cable tower in a bridge construction process according to claim 1, wherein, Jack is arranged on all the buckling cables, and the extension and contraction of the buckling cables are adjusted according to the deformation of the cable tower.

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