Method for installing and positioning permanent auxiliary cable saddle of auxiliary tower of large-span suspension bridge

Abstract

The invention provides a method for installing and positioning a permanent auxiliary cable saddle of an auxiliary tower of a large-span suspension bridge, and belongs to the technical field of suspension bridge construction.The method comprises the steps that a position sensor is installed on a main cable, and in the line shape adjusting process of the main cable, the current line shape of the main cable is generated in real time according to position data, collected by the position sensor, of the main cable; the standard main cable shape and the current main cable shape are projected in the Y direction to judge whether the standard main cable shape and the current main cable shape are parallel or not, and after the standard main cable shape and the current main cable shape are parallel, whether the distance between the two parallel lines is lower than a distance deviation threshold value or not is judged, so that the main cable and the main cable containing groove in the permanent auxiliary cable saddle are accurately positioned, and stress distribution is uniform after the main cable and the permanent auxiliary cable saddle are connected; and the mounting safety of the suspension bridge is further ensured.

Description

Technical Field

[0001] This invention belongs to the field of suspension bridge construction technology, and relates to the installation technology of permanent auxiliary cable saddles, specifically a method for installing and positioning permanent auxiliary cable saddles on the auxiliary towers of long-span suspension bridges. Background Technology

[0002] All loads on a suspension bridge, including those on the bridge deck (stiffening girder), vehicles, pedestrians, wind, and earthquakes, are ultimately transferred to the main cable via the suspenders, and then from the main cable to the main tower and anchorage. The main cable is the primary load-bearing structure of a suspension bridge, and its alignment determines the path and magnitude of force transmission, affecting the uniformity of stress on the suspenders and the safety of the main tower and anchorage. Therefore, in the construction of long-span suspension bridges (especially those with spans exceeding 2000 meters), the alignment of the main cable must be strictly controlled.

[0003] To better control the alignment of the main cable on long-span suspension bridges, existing technologies typically involve installing secondary towers at the side spans to support the main cable, with the main cable mounted on top of the secondary towers. However, in actual construction, to meet the technological requirements of main cable erection and box girder hoisting, temporary secondary cable saddles are usually installed on top of the secondary towers first. After the box girder is hoisted, the temporary secondary cable saddles are replaced with permanent secondary cable saddles, which then secure the main cable to the top of the secondary towers, thus fixing the alignment of the main cable.

[0004] However, in existing technologies, the installation of permanent auxiliary cable saddles generally employs a method of repeatedly jacking the main cable saddle, referred to as the repeated jacking method. This method involves actively and gradually jacking the main cable saddle at the top of the main tower to artificially release or compensate for the unbalanced forces caused by construction loading, thereby controlling the main tower's deviation and the main cable's elevation at the auxiliary tower within the design limits. However, this method of artificially releasing or compensating for the unbalanced forces borne by the main and auxiliary towers makes it difficult to precisely align the main cable with the main cable receiving groove on the permanent auxiliary cable saddle. This results in deviations in the main cable's lateral or elevation directions, causing uneven stress distribution after the main cable is connected to the permanent auxiliary cable saddle. Summary of the Invention

[0005] In response to the aforementioned background art, the existing technology, during the installation of permanent auxiliary cable saddles, involves manually releasing or compensating for the unbalanced forces borne by the main tower and auxiliary tower. This results in difficulty in accurately aligning the main cable with the main cable receiving groove on the permanent auxiliary cable saddle, leading to uneven stress distribution after the main cable and permanent auxiliary cable saddle are connected. To address this technical problem, this invention proposes an installation and positioning method for permanent auxiliary cable saddles on auxiliary towers of long-span suspension bridges.

[0006] This invention determines whether the standard main cable alignment and the current main cable alignment are parallel by projecting them along the Y direction. If they are parallel, it then determines whether the distance between the two parallel lines is lower than the distance deviation threshold. This allows for precise positioning of the main cable and the main cable receiving groove on the permanent auxiliary cable saddle, ensuring uniform stress distribution after the main cable is connected to the permanent auxiliary cable saddle, and further guaranteeing the safety of suspension bridge installation.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for installing and positioning permanent auxiliary cable saddles on the auxiliary towers of a long-span suspension bridge includes the following steps: S1: Install position sensors on the main cable; S2: Obtain the linear equation corresponding to the center axis of the main cable receiving groove on the permanent auxiliary cable saddle after its installation, and use it as the standard main cable alignment. Under the action of the jacking device, the main cable is jacked to the preset elevation, and then the alignment of the main cable is adjusted by the jacking device; during the alignment adjustment process, the position data of the main cable is collected in real time by the position sensor, and the current alignment of the main cable is generated in real time based on the position data. S4: Project the standard main cable profile and the current main cable profile along the Y direction, and determine whether the two projected lines are parallel; like If the two projection lines are parallel, it means that the current main cable alignment matches the standard main cable alignment. In the formula, K1 is the slope of the projection line corresponding to the standard main cable alignment, and K2 is the slope of the projection line corresponding to the current main cable alignment. Otherwise, continue to adjust the alignment of the main cable (10) until the current main cable alignment matches the standard main cable alignment; S5: Securely install the main cable with the matched alignment onto the permanent auxiliary cable saddle, completing the installation and positioning of the permanent auxiliary cable saddle on the auxiliary tower of the long-span suspension bridge.

[0008] Further specifying, S1 specifically includes: S1.1: Install constraint and fixing devices on both sides of the secondary tower along the extension direction of the main cable, namely the first constraint and fixing device and the second constraint and fixing device, to fix the main cable through the first constraint and fixing device and the second constraint and fixing device. S1.2: Remove the temporary auxiliary cable saddle and install a position sensor on the main cable between the first and second constraint fixing devices.

[0009] Further specifying, S2 specifically includes: S2.1: Obtain the linear equation corresponding to the center axis of the main cable receiving groove on the permanent auxiliary cable saddle, as the standard main cable linear shape; S2.2: Use the jacking device to simultaneously jack up the first and second constraint fixing devices to raise the main cable to the preset elevation; S2.3: Under the action of the lifting device, the alignment of the main cable is adjusted by the first and second constraint fixing devices; during the alignment adjustment process, the position data of the main cable is collected in real time by the position sensor, and the current alignment of the main cable is generated in real time based on the position data.

[0010] Further specifying, S5 is: S5.1: Hoist the lower saddle body of the permanent auxiliary cable saddle to the top of the auxiliary tower, and simultaneously lower the first and second constraint fixing devices using the jacking device, and place the main cable with the matched alignment on the lower saddle body of the permanent auxiliary cable saddle; S5.2: Hoist the upper saddle body of the permanent auxiliary cable saddle to the installation position corresponding to the lower saddle body of the permanent auxiliary cable saddle, and fix the upper saddle body and the lower saddle body of the permanent auxiliary cable saddle to complete the installation and positioning of the permanent auxiliary cable saddle of the auxiliary tower of the long-span suspension bridge.

[0011] Further specified, the distance between the first constraint fixing device and the corresponding side edge of the secondary tower does not exceed 1 / 2 of the width of the secondary tower; the distance between the second constraint fixing device and the corresponding side edge of the secondary tower does not exceed 1 / 2 of the width of the secondary tower; wherein, the width of the secondary tower refers to the Y direction.

[0012] Further specifying, in S1.2, installing position sensors on the main cable between the first constraint fixing device and the second constraint fixing device specifically includes: uniformly installing multiple position sensors on the main cable between the first constraint fixing device and the second constraint fixing device.

[0013] Further specifying, the process of collecting the position data of the main cable in real time through position sensors and generating the alignment equation of the current main cable alignment based on the position data during the main cable alignment adjustment process specifically includes: During the alignment adjustment of the main cable, position data of the main cable is collected in real time through position sensors; The midpoint of the main cable between the first and second constraint fixing devices is taken, and the main cable is divided into a first segment and a second segment based on the midpoint position; the average value of the position data collected by all position sensors on the first segment is taken as the first average position data; the average value of the position data collected by all position sensors on the second segment is taken as the second average position data. The current main cable alignment is generated based on the elevation data from the first average position data and the elevation data from the second average position data.

[0014] Further defining the standard main cable profile, the expression is as follows: In the formula, z i When installing a permanent auxiliary cable saddle, the elevation value of the center axis of the main cable receiving groove at the i-th point, in meters; xi When installing a permanent auxiliary cable saddle, the value of the central axis of the main cable receiving groove in the x-direction at the i-th point is taken in meters (m); y i When installing the permanent auxiliary cable saddle, the value of the central axis of the main cable receiving groove in the y direction at the i-th point is taken in meters; a is the slope corresponding to the linear equation of the standard main cable shape, which is dimensionless; b is the intercept corresponding to the linear equation of the standard main cable shape, which is in meters; y0 is the fixed installation position of the central axis of the main cable receiving groove in the y direction when installing the permanent auxiliary cable saddle.

[0015] Further specified, brackets are fixedly installed on both sides of the secondary tower along the extension direction of the main cable. The bracket on one side is connected to the first constraint fixing device through a jacking device; the bracket on the other side is connected to the second constraint fixing device through a jacking device.

[0016] Further defined, the first constraint fixing device includes a bottom connecting seat, a strand placement groove and an upper limiting plate. The strand placement groove is formed by the bottom connecting seat and the upper limiting plate being fixedly connected after being surrounded. The shape of the strand placement groove matches the strand receiving groove on the temporary auxiliary cable saddle. The bottom connecting seat is connected to the power output end of the lifting device. The first constraint fixing device and the second constraint fixing device have the same structure.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention discloses an installation and positioning method for a permanent auxiliary cable saddle on a secondary tower of a long-span suspension bridge. This method involves installing a position sensor on the main cable, generating the current main cable alignment in real time based on the position data collected by the sensor, projecting the standard main cable alignment and the current main cable alignment along the Y-direction to determine if they are parallel, and then determining if the distance between the two parallel lines is below a distance deviation threshold. This allows for precise positioning of the main cable and the main cable receiving groove on the permanent auxiliary cable saddle, ensuring uniform stress distribution after the main cable is connected to the permanent auxiliary cable saddle, and further guaranteeing the safety of the suspension bridge installation.

[0018] 2. The present invention provides a method for installing and positioning permanent secondary cable saddles on secondary towers of long-span suspension bridges. The method involves installing constraint and fixing devices on both sides of the secondary tower along the extension direction of the main cable, and lifting the constraint and fixing devices using a jacking device. This replaces the existing repeated jacking method, thereby ensuring that there is no unbalanced moment between the main tower and the secondary tower, and guaranteeing the structural safety of the main tower and the secondary tower.

[0019] 3. This invention sets up multiple position sensors and takes the average value of the position data collected by all position sensors on the first segment as the first average position data; takes the average value of the position data collected by all position sensors on the second segment as the second average position data; and generates the current main cable alignment based on the elevation data in the first average position data and the elevation data in the second average position data. The accuracy of the current main cable alignment generation is ensured by taking values ​​from multiple points and then averaging them.

[0020] 4. The present invention matches the shape of the strand placement groove with the strand receiving groove on the temporary auxiliary saddle, both of which are set to hexagons. This solves the problem in the prior art that the shape of the strand receiving groove on the temporary auxiliary saddle does not match the main cable when the permanent auxiliary saddle is replaced, avoids stress concentration on the main cable and strand damage, and simplifies the installation process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the installation and positioning method for the permanent auxiliary cable saddle of the auxiliary tower of the long-span suspension bridge according to the present invention; Figure 2 This is a schematic diagram of the installation of a temporary auxiliary cable saddle at the top of the secondary tower in the existing technology; Figure 3 A schematic diagram showing the installation of a constraint fixing device at the top of the secondary tower; Figure 4 This is a schematic diagram of the temporary auxiliary cable saddle lifting. Figure 5 A schematic diagram of the main cable alignment adjustment; Figure 6 A schematic diagram of the lower saddle body for installing the permanent auxiliary cable saddle; Figure 7 This is a schematic diagram showing the situation after the restraint and fixing device has been removed. Figure 8 This is a schematic diagram of the constraint fixing device; Figure 9 This is a structural diagram of a temporary auxiliary cable saddle; Explanation of reference numerals in the attached figures: 1-Temporary auxiliary cable saddle, 2-Base plate, 3-Lower saddle groove, 4-Wing plate, 5-Cable strand receiving groove, 6-Upper pressure plate, 7-First bolt, 8-Top groove plate of auxiliary tower, 9-First restraint fixing device, 10-Main cable, 11-Second restraint fixing device, 12-Bracket, 13-Lifting device, 14-Permanent auxiliary cable saddle, 1401-Lower saddle body of permanent auxiliary cable saddle, 1402-Upper saddle body of permanent auxiliary cable saddle, 15-Auxiliary tower, 16-Position sensor, 17-Bottom connecting seat, 18-Cable strand placement groove, 19-Upper limiting plate, 20-Second bolt. Detailed Implementation

[0022] The technical solution of the present invention will be further explained and described below with reference to the accompanying drawings and real-time methods, but the present invention is not limited to the embodiments described below.

[0023] During the construction of suspension bridges, in order to meet the technological requirements of main cable erection and box girder hoisting, temporary auxiliary cable saddles 1 are generally installed on the top of the secondary towers first. After the box girder hoisting is completed, the temporary auxiliary cable saddles 1 are replaced with permanent auxiliary cable saddles 14. See [link to relevant documentation]. Figure 2 and Figure 9 The temporary auxiliary cable saddle 1 includes a base plate 2, a lower saddle groove 3, wing plates 4, an upper pressure plate 6, and a first bolt 7. A top groove plate 8 of the auxiliary tower 15 is fixed on the top of the auxiliary tower 15. The lower surface of the base plate 2 contacts the upper surface of the top groove plate 8 of the auxiliary tower and forms a sliding friction pair. Wing plates 4 are provided on both sides above the base plate 2. An upper pressure plate 6 is installed above the wing plates 4. The base plate 2, the wing plates 4 on both sides, and the upper pressure plate 6 together form a cable strand installation cavity. A lower saddle groove 3 is provided at the bottom of the cable strand installation cavity, and a cable strand clamping member is provided at the top of the cable strand installation cavity, thereby forming a cable strand receiving groove 5 with a hexagonal cross section. The upper pressure plate 6, wing plates 4, and base plate 2 are fixedly connected by the first bolt 7 that passes through from top to bottom. When installing the temporary auxiliary cable saddle 1, it is necessary to pre-bias it in the opposite direction of the main span. This will cause the main cable to move towards the middle span under the weight of the box girder during the later hoisting of the box girder, thereby causing the temporary auxiliary cable saddle 1 to deflect and offset the offset, ensuring that the temporary auxiliary cable saddle 1 can be accurately returned to the design position.

[0024] See Figure 3 and Figure 8 This invention addresses the technical problem in existing technologies where an unbalanced moment occurs between the main tower and the secondary tower during the repeated jacking installation of the permanent auxiliary cable saddle 14, affecting the structural safety of both towers. The invention employs a jacking method, installing constraint fixing devices (a first constraint fixing device 9 and a second constraint fixing device 11) on both sides of the secondary tower 15 along the extension direction of the main cable 10. A lifting device 13 is positioned below the first and second constraint fixing devices 9 and 11, securing the main cable 10 on both sides of the top of the secondary tower 15 using the first and second constraint fixing devices 9 and 11. The lifting device 13 then lifts the main cable. In a preferred embodiment, the lifting device 13 is a hydraulic jack; however, it can also be other equipment known to those skilled in the art capable of providing lifting power.

[0025] The structure of the first constraint fixing device 9 is completely identical to that of the second constraint fixing device 11. The first constraint fixing device 9 includes a bottom connecting seat 17, a strand placement groove 18, an upper limiting plate 19, and a second bolt 20. The strand placement groove 18 is formed by the bottom connecting seat 17 and the upper limiting plate 19 being enclosed and fixedly connected. The shape of the strand placement groove 18 matches that of the strand receiving groove 5 on the temporary auxiliary saddle 1, both of which are hexagonal structures. The bottom connecting seat 17 is connected to the power output end of the lifting device 13. The upper limiting plate 19 and the bottom connecting seat 17 are fixedly connected by the second bolt 20, which passes through from top to bottom.

[0026] As a preferred embodiment of the present invention, see Figure 3 In this invention, brackets 12 are fixedly installed on both sides of the auxiliary tower 15 along the extension direction of the main cable 10. One bracket 12 is connected to the first constraint fixing device 9 through a lifting device 13; the other bracket 12 is connected to the second constraint fixing device 11 through the lifting device 13. As a preferred embodiment of the invention, the bracket 12 is a tripod.

[0027] In a preferred embodiment of the invention, both the first bolt 7 and the second bolt 20 are high-strength bolts.

[0028] See Figure 1 This invention proposes a method for installing and positioning permanent auxiliary cable saddles on the auxiliary towers of long-span suspension bridges, comprising the following steps: S1: Install a position sensor 16 on the main cable 10; wherein, S1 specifically includes: S1.1: Install constraint fixing devices on both sides of the secondary tower 15 along the extension direction of the main cable 10, namely a first constraint fixing device 9 and a second constraint fixing device 11, to fix the main cable 10 through the first constraint fixing device 9 and the second constraint fixing device 11; S1.2: See Figure 4 and Figure 5 The temporary auxiliary cable saddle 1 is disassembled, and a position sensor 16 is installed on the main cable 10 between the first constraint fixing device 9 and the second constraint fixing device 11. In a preferred embodiment of the present invention, installing the position sensor 16 on the main cable 10 between the first constraint fixing device 9 and the second constraint fixing device 11 specifically includes: uniformly installing multiple position sensors 16 on the main cable 10 between the first constraint fixing device 9 and the second constraint fixing device 11.

[0029] S2: Obtain the linear equation corresponding to the center axis of the main cable receiving groove on the permanent auxiliary cable saddle 14 after installation, as the standard main cable alignment; wherein, the linear equation corresponding to the center axis of the main cable receiving groove is calculated based on the installation of the permanent auxiliary cable saddle 14, and the specific calculation method is existing technology; or the linear equation corresponding to the center axis of the main cable receiving groove is generated by first identifying the installation drawings of the permanent auxiliary cable saddle 14, and then generating an installation model based on the installation drawings using BIM modeling technology; in this step, the expression of the standard main cable alignment is: In the formula, z i When installing the permanent auxiliary cable saddle 14, the elevation value of the center axis of the main cable receiving groove at the i-th point, in meters; x i When installing the permanent auxiliary cable saddle 14, the value of the central axis of the main cable receiving groove in the x-direction at the i-th point is taken in meters (m); y i When installing the permanent auxiliary cable saddle 14, the value of the central axis of the main cable receiving groove in the y direction at the i-th point is taken in meters; a is the slope corresponding to the linear equation of the standard main cable shape, which is dimensionless; b is the intercept corresponding to the linear equation of the standard main cable shape, which can be zero; y0 is the installation position of the central axis of the main cable receiving groove in the y direction when installing the permanent auxiliary cable saddle 14, and its value is fixed.

[0030] See Figure 5 Under the action of the lifting device 13, the main cable 10 is lifted to a preset elevation, and then the alignment of the main cable 10 is adjusted by the lifting device 13. During the alignment adjustment process, the position data of the main cable 10 is collected in real time by the position sensor 16, and the current main cable alignment is generated in real time based on the position data. Specifically: the lifting device 13 simultaneously lifts the first constraint fixing device 9 and the second constraint fixing device 11 to lift the main cable 10 to a preset elevation; under the action of the lifting device 13, the alignment of the main cable 10 is adjusted by the first constraint fixing device 9 and the second constraint fixing device 11; during the alignment adjustment process, the position data of the main cable 10 is collected in real time by the position sensor 16, and the current main cable alignment is generated in real time based on the position data. In this step, the expression for the current main cable alignment is: In the formula, z j x is the elevation value of the center axis of the current main cable 10 at the j-th point, in meters; j The x-axis value of the central axis of the current main cable 10 at the j-th point is taken in the x-direction, in meters; y jy is the value of the central axis of the current main cable 10 at the j-th point in the y direction, in meters; c is the slope corresponding to the linear equation of the current main cable, dimensionless; d is the intercept corresponding to the linear equation of the current main cable, in meters, which can be zero; y0 is the installation position of the central axis of the main cable receiving groove in the y direction when the permanent auxiliary cable saddle 14 is installed, and its value is fixed.

[0031] In a preferred embodiment of the present invention, the preset elevation is 0.5 meters. The purpose of setting the preset elevation is to leave space for the installation of the permanent auxiliary cable saddle 14. Alternatively, the preset elevation can also be set by the construction personnel themselves, as long as it does not affect the installation of the permanent auxiliary cable saddle 14. Adjusting the alignment of the main cable 10 is mainly achieved by continuously raising or lowering the first constraint fixing device 9 or the second constraint fixing device 11 by the jacking device 13.

[0032] S4: Project the standard main cable profile and the current main cable profile along the Y direction, and determine whether the two projected lines are parallel; like If the two projection lines are parallel, it means that the current main cable alignment matches the standard main cable alignment. In the formula, K1 is the slope of the projection line corresponding to the standard main cable alignment, and K2 is the slope of the projection line corresponding to the current main cable alignment. Otherwise, continue adjusting the alignment of main cable 10 until the current main cable alignment matches the standard main cable alignment; Specifically, this judgment process is determined by establishing a coordinate system with the horizontal direction of the permanent auxiliary cable saddle 14 base plate as the X-axis and the vertical direction as the Y-axis. For example, the linear equation corresponding to the central axis of the main cable receiving groove on the permanent auxiliary cable saddle 14 is: Y1 = 0.1762X + 191.83; the linear equation of the current main cable is: Y1 = 0.1683X + 268.83. ×100%=4.48%≤5% meets the requirements.

[0033] See Figure 6 and Figure 7 S5: Fix the main cable 10 with the matched alignment onto the permanent auxiliary cable saddle 14, completing the installation and positioning of the permanent auxiliary cable saddle for the secondary tower of the long-span suspension bridge. Specifically, S5.1: Hoist the lower saddle body 1401 of the permanent auxiliary cable saddle to the top of the secondary tower 15, remove all position sensors 16, and simultaneously lower the first constraint fixing device 9 and the second constraint fixing device 11 using the jacking device 13, placing the main cable 10 with the matched alignment onto the lower saddle body 1401 of the permanent auxiliary cable saddle; S5.2: Hoist the upper saddle body 1402 of the permanent auxiliary cable saddle to the installation position corresponding to the lower saddle body 1401 of the permanent auxiliary cable saddle, and fix the upper saddle body 1402 and the lower saddle body 1401 of the permanent auxiliary cable saddle, completing the installation and positioning of the permanent auxiliary cable saddle for the secondary tower of the long-span suspension bridge.

[0034] In a preferred embodiment of the present invention, the distance between the first constraint fixing device 9 and the corresponding side edge of the sub-tower 15 does not exceed 1 / 2 of the width of the sub-tower 15; the distance between the second constraint fixing device 11 and the corresponding side edge of the sub-tower 15 does not exceed 1 / 2 of the width of the sub-tower 15; wherein, the width of the sub-tower 15 refers to the Y direction. The sub-tower 15 is designed according to specific requirements and is a parameter known to those skilled in the art.

[0035] As a preferred embodiment of the present invention, during the alignment adjustment of the main cable 10, the position data of the main cable 10 is collected in real time by the position sensor 16, and the alignment equation of the current main cable alignment is generated in real time based on the position data. Specifically, during the alignment adjustment of the main cable 10, the position data of the main cable 10 is collected in real time by the position sensor 16. The midpoint of the main cable 10 between the first constraint fixing device 9 and the second constraint fixing device 11 is taken, and the main cable 10 is divided into a first segment and a second segment based on the midpoint position; the average value of the position data collected by all position sensors 16 on the first segment is taken as the first average position data; the average value of the position data collected by all position sensors 16 on the second segment is taken as the second average position data; the current main cable alignment is generated based on the elevation data in the first average position data and the elevation data in the second average position data.

[0036] This invention discloses a method for installing and positioning a permanent auxiliary cable saddle on a secondary tower of a long-span suspension bridge. The method involves installing a position sensor 16 on the main cable 10, generating the current main cable alignment in real time based on the position data collected by the position sensor 16, projecting the standard main cable alignment and the current main cable alignment along the Y direction to determine if they are parallel, and then determining if the distance between the two parallel lines is below a distance deviation threshold. This allows for precise positioning of the main cable 10 and the main cable receiving groove on the permanent auxiliary cable saddle 14, ensuring uniform stress distribution after the main cable 10 and the permanent auxiliary cable saddle 14 are connected, further guaranteeing the safety of the suspension bridge installation.

[0037] The above description is only used to illustrate the technical solutions of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing, those skilled in the art should understand that modifications can still be made to the technical solutions described above, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A method for installing and positioning permanent auxiliary cable saddles on the auxiliary towers of a long-span suspension bridge, characterized in that, Includes the following steps: S1: Install a position sensor (16) on the main cable (10). S2: Obtain the linear equation corresponding to the center axis of the main cable receiving groove on the permanent auxiliary cable saddle (14) after its installation, and use it as the standard main cable line shape; Under the action of the lifting device (13), the main cable (10) is lifted to the preset elevation, and then the alignment of the main cable (10) is adjusted by the lifting device (13); during the alignment adjustment of the main cable (10), the position data of the main cable (10) is collected in real time by the position sensor (16), and the current alignment of the main cable is generated in real time based on the position data. S4: Project the standard main cable profile and the current main cable profile along the Y direction, and determine whether the two projected lines are parallel; like If the two projection lines are parallel, it means that the current main cable alignment matches the standard main cable alignment. In the formula, K1 is the slope of the projection line corresponding to the standard main cable alignment, and K2 is the slope of the projection line corresponding to the current main cable alignment. Otherwise, continue to adjust the alignment of the main cable (10) until the current main cable alignment matches the standard main cable alignment; S5: Fix the main cable (10) with the matching alignment on the permanent secondary cable saddle (14) to complete the installation and positioning of the permanent secondary cable saddle of the secondary tower of the long-span suspension bridge.

2. The method for installing and positioning the permanent auxiliary cable saddle of the secondary tower of a long-span suspension bridge according to claim 1, characterized in that, S1 specifically includes: S1.1: Install constraint fixing devices on both sides of the auxiliary tower (15) along the extension direction of the main cable (10), namely the first constraint fixing device (9) and the second constraint fixing device (11), to fix the main cable (10) through the first constraint fixing device (9) and the second constraint fixing device (11); S1.2: Remove the temporary secondary cable saddle (1) and install a position sensor (16) on the main cable (10) between the first constraint fixing device (9) and the second constraint fixing device (11).

3. The method for installing and positioning the permanent auxiliary cable saddle of the auxiliary tower of a long-span suspension bridge according to claim 2, characterized in that, S2 specifically includes: S2.1: Obtain the linear equation corresponding to the center axis of the main cable receiving groove on the permanent auxiliary cable saddle (14) as the standard main cable linear shape; S2.2: Using the jacking device (13) to simultaneously jack up the first constraint fixing device (9) and the second constraint fixing device (11), the main cable (10) is jacked up to the preset elevation; S2.3: Under the action of the lifting device (13), the alignment of the main cable (10) is adjusted by the first constraint fixing device (9) and the second constraint fixing device (11); during the alignment adjustment of the main cable (10), the position data of the main cable (10) is collected in real time by the position sensor (16), and the current alignment of the main cable is generated in real time according to the position data.

4. The method for installing and positioning the permanent auxiliary cable saddle of the auxiliary tower of a long-span suspension bridge according to claim 2, characterized in that, S5 is: S5.1: Hoist the lower saddle body (1401) of the permanent auxiliary cable saddle to the top of the auxiliary tower (15), and simultaneously lower the first constraint fixing device (9) and the second constraint fixing device (11) using the jacking device (13), and place the main cable (10) with the matching line shape on the lower saddle body (1401) of the permanent auxiliary cable saddle; S5.2: Hoist the upper saddle body (1402) of the permanent auxiliary cable saddle to the installation position corresponding to the lower saddle body (1401) of the permanent auxiliary cable saddle, and fix the upper saddle body (1402) and the lower saddle body (1401) of the permanent auxiliary cable saddle to complete the installation and positioning of the permanent auxiliary cable saddle of the auxiliary tower of the long-span suspension bridge.

5. The method for installing and positioning the permanent auxiliary cable saddle of the auxiliary tower of a long-span suspension bridge according to claim 2, characterized in that, The distance between the first constraint fixing device (9) and the corresponding side edge of the sub-tower (15) does not exceed 1 / 2 of the width of the sub-tower (15); the distance between the second constraint fixing device (11) and the corresponding side edge of the sub-tower (15) does not exceed 1 / 2 of the width of the sub-tower (15); wherein, the width of the sub-tower (15) refers to the Y direction.

6. The method for installing and positioning the permanent auxiliary cable saddle of the secondary tower of a long-span suspension bridge according to claim 3, characterized in that, In S1.2, installing position sensors (16) on the main cable (10) between the first constraint fixing device (9) and the second constraint fixing device (11) specifically includes: uniformly installing multiple position sensors (16) on the main cable (10) between the first constraint fixing device (9) and the second constraint fixing device (11).

7. The method for installing and positioning the permanent auxiliary cable saddle of the secondary tower of a long-span suspension bridge according to claim 6, characterized in that, During the alignment adjustment process of the main cable (10), the position data of the main cable (10) is collected in real time by the position sensor (16), and the alignment equation of the current main cable alignment is generated in real time based on the position data. Specifically, this includes: During the alignment adjustment of the main cable (10), the position data of the main cable (10) is collected in real time by the position sensor (16); Take the midpoint position of the main cable (10) between the first constraint fixing device (9) and the second constraint fixing device (11), and divide the main cable (10) into a first segment and a second segment based on the midpoint position; take the average value of the position data collected by all position sensors (16) on the first segment as the first average position data; take the average value of the position data collected by all position sensors (16) on the second segment as the second average position data. The current main cable alignment is generated based on the elevation data from the first average position data and the elevation data from the second average position data.

8. The method for installing and positioning the permanent auxiliary cable saddle of the auxiliary tower of a long-span suspension bridge according to claim 1, characterized in that, The expression for the standard main cable profile is: In the formula, z i When installing the permanent auxiliary cable saddle (14), the elevation value of the central axis of the main cable receiving groove at the i-th point, in meters; x i When installing the permanent auxiliary cable saddle (14), the central axis of the main cable receiving groove is taken in the x direction at the i-th point, in meters; y i When installing the permanent secondary cable saddle (14), the value of the central axis of the main cable receiving groove in the y direction at the i-th point is taken, in m; a is the slope corresponding to the linear equation of the standard main cable shape, dimensionless; b is the intercept corresponding to the linear equation of the standard main cable shape, in m; When y0 is the permanent auxiliary cable saddle (14), the installation position of the central axis of the main cable receiving groove in the y direction is fixed.

9. The method for installing and positioning the permanent auxiliary cable saddle of the auxiliary tower of a long-span suspension bridge according to claim 2, characterized in that, Brackets (12) are fixedly installed on both sides of the secondary tower (15) along the extension direction of the main cable (10). One bracket (12) is connected to the first constraint fixing device (9) through the lifting device (13); the other bracket (12) is connected to the second constraint fixing device (11) through the lifting device (13).

10. The method for installing and positioning the permanent auxiliary cable saddle of the auxiliary tower of a long-span suspension bridge according to claim 9, characterized in that, The first constraint fixing device (9) includes a bottom connecting seat (17), a cable strand placement groove (18) and an upper limiting plate (19). The cable strand placement groove (18) is formed by the bottom connecting seat (17) and the upper limiting plate (19) being fixedly connected after being enclosed. The shape of the cable strand placement groove (18) matches the cable strand receiving groove (5) on the temporary auxiliary cable saddle (1). The bottom connecting seat (17) is connected to the power output end of the lifting device (13). The first constraint fixing device (9) and the second constraint fixing device (11) have the same structure.

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