A maintenance system and maintenance method for an inverted Y-shaped tower column of a cable-stayed bridge

Abstract

The present invention provides a maintenance system for an inverted Y-shaped tower of a cable-stayed bridge, wherein a telescopic boom device at the top of the tower is fixed on the parapet at the top of the tower, a movable bracket passes through a fixed bracket, the fixed bracket is fixed on the parapet at the top of the tower, and the movable bracket adjusts the length of the tower wall through a telescopic mechanism; the annular hoop device in the tower is clamped in the middle of the inverted Y-shaped tower by gravity, and the annular hoop device in the tower includes an annular skeleton, a track, an electric running wheel, and a lifting lug; the suspended operating platform is provided with a plurality of lifting points, and the lifting points are connected to the telescopic boom device at the top of the tower and the annular hoop device in the tower by a lifting rope. The maintenance system of the present invention has a small maintenance workload due to the small size of the telescopic boom device at the top of the tower and the annular hoop device in the tower; the telescopic boom device at the top of the tower can be retracted into the parapet at the top of the tower when not in operation, which has a small impact on the landscape of the bridge; the annular hoop device in the tower is clamped in the middle of the tower by gravity, and there is no need to set anchors on the tower, thereby reducing the impact on the tower structure.

Description

Technical Field

[0001] The invention relates to the technical field of bridge maintenance, in particular to a maintenance system and a maintenance method for an inverted Y-shaped tower column of a cable-stayed bridge. Background Art

[0002] Cable-stayed bridges have been widely used in the field of bridge engineering due to their beautiful appearance, reasonable force and large spanning capacity. As the main load-bearing component, the tower of a cable-stayed bridge bears various loads transmitted by the cable-stayed cables. During the operation of the bridge, the tower needs to be inspected and maintained due to structural safety requirements or painted and decorated due to landscape requirements. In the past cable-stayed bridge designs, due to insufficient understanding of maintenance, some cable-stayed bridges did not install tower maintenance systems, and some cable-stayed bridges only set up maintenance platforms at several key maintenance locations of the tower, which could not meet the maintenance requirements of full coverage of the tower. In the newly built cable-stayed bridges in recent years, a 360-degree rotatable crane is sometimes installed at the center of the top of the tower. The crane arm is retractable and a hanging basket is hung at the end of the crane arm. The tower is repaired by lifting the hanging basket. This maintenance system has problems such as interference with the auxiliary facilities on the top of the tower, high maintenance cost, short service life and high cost. In addition, for the lower forked tower column of the inverted Y-shaped tower column, there are problems such as the inner inclined surface and the interference of the 0# cable on the inner inclined surface. How to fully cover the inverted Y-shaped tower column is even more difficult. Therefore, it is necessary to develop an inspection system that meets the requirements of light weight, easy operation, reasonable cost, low later maintenance cost, and can achieve full coverage inspection of the inverted Y-shaped tower column without being affected by obstacles such as inclined cables. Summary of the invention

[0003] The object of the present invention is to provide a maintenance system for an inverted Y-shaped tower column of a cable-stayed bridge, which can realize full coverage maintenance of the inverted Y-shaped tower column position.

[0004] In order to achieve the above-mentioned object, the technical solution of the present invention is as follows: a maintenance system for an inverted Y-shaped tower column of a cable-stayed bridge, characterized in that the maintenance system comprises

[0005] A telescopic boom device at the top of the tower, wherein the telescopic boom device at the top of the tower is fixed on the parapet at the top of the tower column, and the telescopic boom device at the top of the tower column comprises a fixed bracket, a movable bracket, and a telescopic mechanism, wherein the movable bracket passes through the fixed bracket, and the fixed bracket is fixed on the parapet at the top of the tower column, and the telescopic mechanism is used to adjust the length of the movable bracket extending out of the tower column wall;

[0006] An annular hoop device in the tower, wherein the annular hoop device in the tower is clamped in the middle of the inverted Y-shaped tower column by gravity, and the annular hoop device in the tower comprises an annular frame, a track arranged in the transverse direction below the annular frame, and an electric running wheel running along the track in the transverse direction;

[0007] A suspended operating platform is provided with a plurality of suspension points, and the suspension points are connected with a telescopic boom device at the top of the tower and an annular hoop device in the tower through suspension ropes.

[0008] Furthermore, the suspended operating platform includes several groups of operating platforms arranged at different heights of the Y-shaped tower column, including a first operating platform arranged at a straight tower column with equal cross-section, a second operating platform arranged at a straight tower column with variable cross-section, a third operating platform arranged at a forked tower column cable interference section, and a fourth operating platform arranged at a forked tower column cable non-interference section, wherein the first operating platform includes two symmetrically arranged C-shaped operating platforms and a straight-line telescopic operating platform located between the two C-shaped operating platforms; the second operating platform includes two symmetrically arranged U-shaped operating platforms and two straight-line telescopic operating platforms located between the two U-shaped operating platforms. Platform; the third operating platform includes two door-shaped operating platforms and a mobile operating platform located between the two door-shaped operating platforms; the fourth operating platform includes two U-shaped operating platforms, among which the C-shaped operating platform, the I-shaped telescopic operating platform, and the U-shaped operating platform are all connected to the movable bracket of the telescopic boom device on the top of the tower by a lifting rope, a single door-shaped operating platform is connected to the movable bracket of the telescopic boom device on the top of the tower and the annular hoop device in the tower by a lifting rope, a single U-shaped operating platform is connected to the movable bracket of the telescopic boom device on the top of the tower and the annular hoop device in the tower by a lifting rope, and the mobile operating platform is connected to the electric walking wheel of the annular hoop device in the tower by a lifting rope.

[0009] Further, the C-shaped operating platform is composed of a C-shaped L1 hanging basket, and the straight-line telescopic operating platform is composed of a straight-line telescopic L2 hanging basket; the U-shaped operating platform includes a C-shaped L1 hanging basket, and the protrusions at both ends of the C-shaped L1 hanging basket are respectively connected to a straight-line L3 hanging basket; the door-shaped operating platform includes a C-shaped L1 hanging basket, and the protrusions at both ends of the C-shaped L1 hanging basket are sequentially connected to a straight-line L3 hanging basket and a straight-line L4 hanging basket; the mobile operating platform includes a straight-line L5 middle hanging basket and L6 hanging baskets that are arranged on both sides of the L5 middle hanging basket and can slide along the bridge direction along both sides of the L5 middle hanging basket; the round-shaped operating platform includes a C-shaped L1 hanging basket, The straight L7 hanging basket is arranged on the opposite side of the C-shaped L1 hanging basket, and the protruding parts at both ends of the C-shaped hanging basket are connected to the L7 hanging basket through the straight L3 hanging basket and the straight L4 hanging basket in sequence.

[0010] Furthermore, the two sides of the I-shaped telescopic operating platform have telescopic functions, and when it is lifted or lowered through the inclined cables, the cantilevers on both sides are retracted to avoid the inclined cables.

[0011] Furthermore, each suspended operating platform is equipped with a hoist, an operating control system, and a rope retractor for driving the operating platform to move up and down.

[0012] Furthermore, the lifting rope includes a working lifting rope and a safety lifting rope, each lifting point is provided with a working lifting rope and a safety lifting rope, the suspended operating platform is provided with a safety lock used in conjunction with the safety lifting rope, the lower end of the working lifting rope is directly connected to the hoist on the suspended operating platform, and the lower end of the safety lifting rope is connected to the operating platform through the safety lock. During normal use, the working lifting rope bears force, and the safety lifting rope is retracted and released accordingly. When the working lifting rope breaks in danger, the safety lifting rope starts to bear force, and the safety lock is automatically activated for braking to prevent the operating platform from continuing to descend.

[0013] Furthermore, the maintenance system includes an anti-fall device, which includes a personnel safety rope with one end fixed to the top of the tower column and a rope lock placed in the suspended operating platform. The rope lock is used to connect the operator's safety belt to the personnel safety rope. When the operating platform is raised or lowered, the rope lock slides along the personnel safety rope. When the operating platform reaches the maintenance position, the rope lock switch is pressed to lock the safety belt and the personnel safety rope.

[0014] Another object of the present invention is to provide a maintenance method for an inverted Y-shaped tower column of a cable-stayed bridge, which can achieve full coverage maintenance of the inverted Y-shaped tower column position.

[0015] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a maintenance method for an inverted Y-shaped tower column of a cable-stayed bridge, characterized in that the method comprises the following steps: ① when repairing a straight tower column, a suspended operating platform is first placed on the bridge deck, and a person carries a lifting rope and a personnel safety rope to the top of the tower column, and the movable bracket is extended out of the parapet at the top of the tower column and locked through the telescopic mechanism of the telescopic boom device at the top of the tower column, and the lifting rope and the personnel safety rope are lowered, and then the lifting rope is installed on the C-shaped operating platform, the U-shaped operating platform and the straight telescopic operating platform, and the person enters the suspended operating platform, fastens the safety belt to the personnel safety rope, and operates the control system to lift the operating platform to the upper straight tower column maintenance position of the inverted Y tower column; using the first operating platform composed of two C-shaped operating platforms and two straight telescopic operating platforms ② The platform is used to inspect and repair the upper straight tower column and equal-section sections; during inspection, the I-shaped telescopic operating platform extends the cantilever, and when it is raised and lowered through the inclined cable, the cantilever is retracted; the second operating platform composed of 2 U-shaped operating platforms and 2 I-shaped telescopic operating platforms is used to inspect and repair the variable-section sections of the upper straight tower column. During inspection, the I-shaped telescopic operating platform adjusts the length of the extended cantilever according to the change in the width of the tower column variable section; ② When inspecting the bifurcated tower column, the personnel take the C-shaped operating platform, the U-shaped operating platform or the I-shaped telescopic operating platform to the position of the annular hoop device in the tower, hang the slings of the door-shaped operating platform and the mobile operating platform as the third operating platform, and the ring-shaped operating platform as the fourth operating platform on the annular hoop device in the tower and lower the slings, and install the slings on the third operating platform. On the gate-shaped operating platform and the mobile operating platform of the working platform, and the circular operating platform serving as the fourth operating platform, personnel enter the operating platform and operate the control system to lift the third operating platform and the fourth operating platform to the lower forked tower column maintenance position of the inverted Y tower column, use the circular operating platform serving as the fourth operating platform to inspect the non-interference section of the forked tower column cable, use the gate-shaped operating platform constituting the third operating platform to inspect the three non-cable surfaces of the forked tower column cable interference section, and use the mobile operating platform constituting the third operating platform to inspect the surface where the cable is located in the forked tower column cable interference section. The mobile operating platform uses the hoist in the operating platform to perform vertical lifting and lowering, uses the electric walking wheels of the annular clamp device in the tower to perform transverse movement, and uses the mobile operating platform to perform horizontal movement. The sliding hanging baskets on both sides of the platform move along the bridge, so as to avoid the cables and fully cover the surface where the cables are located for maintenance; ③ After the maintenance is completed, the third operating platform and the fourth operating platform are lowered to the bridge deck, and the lifting ropes and personnel safety ropes of the third operating platform and the fourth operating platform are released. The personnel take the C-shaped operating platform, U-shaped operating platform or I-shaped telescopic operating platform to the position of the annular clamp device in the tower, release the lifting rope on the annular clamp device in the tower, and then lower the lifting rope, C-shaped operating platform, U-shaped operating platform and I-shaped telescopic operating platform to the bridge deck, release the lifting ropes and personnel safety ropes of the C-shaped operating platform, U-shaped operating platform and I-shaped telescopic operating platform, and after the lifting ropes and personnel safety ropes are retracted at the top of the tower, the telescopic boom device at the top of the tower retracts the movable bracket into the parapet and fixes it;The personnel descended from the tower top to the bridge deck and moved the operating platform to the warehouse, and the inspection was completed. ;

[0016] Furthermore, telescopic cantilevers are provided on both sides of the I-shaped telescopic operating platform. When the platform is lifted or lowered through the inclined cables, the cantilevers on both sides are retracted to avoid the inclined cables.

[0017] The beneficial effects of the present invention are:

[0018] 1) This maintenance system can realize full coverage maintenance of the inverted Y-shaped tower column position. When encountering obstacles such as inclined cables, the inclined cables can be avoided by contracting the I-shaped telescopic operating platform and moving the operating platform in three directions.

[0019] 2) The telescopic boom device on the top of the tower is small in size, has little impact on the layout of other ancillary facilities on the top of the tower, and requires less maintenance workload.

[0020] 3) When the telescopic boom device on the top of the tower is not in use, the telescopic structure can be used to retract the movable bracket into the parapet, which is convenient for maintenance and does not affect the bridge landscape.

[0021] 4) The annular clamp device in the tower uses gravity to clamp the middle of the tower column, without the need to set anchors on the tower column, reducing the impact on the tower column structure.

[0022] 5) The operating platform adopts a truss structure made of high-strength aluminum alloy, which greatly reduces the weight of the operating platform and reduces the force requirements of the telescopic boom device on the top of the tower and the annular hoop device in the tower.

[0023] 6) The suspended operating platform is composed of 7 types of hanging basket units according to different maintenance positions, which reduces the number of hanging baskets and improves the utilization rate of hanging baskets. At the same time, the 6 operating platforms can realize full coverage maintenance of inverted Y-shaped tower columns and can pass through obstacles such as inclined cables.

[0024] 7) When the operating platform and lifting rope are not in use, they can be placed in the warehouse to avoid exposure to the outdoor environment, which greatly increases their service life.

[0025] 8) During maintenance and repair work, the impact on traffic on the bridge deck is small due to the small scope of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A transverse view of the inverted Y-shaped tower maintenance system for a cable-stayed bridge.

[0027] Figure 2 for Figure 1 Large-scale drawing of the telescopic boom device 1 on the top of the middle tower.

[0028] Figure 3 for Figure 1 Large-scale drawing of the annular clamp device 2 in the middle tower.

[0029] Figure 4 for Figure 1 AA cross-section diagram in.

[0030] Figure 5 for Figure 1 BB cross section in.

[0031] Figure 6 for Figure 1 CC cross-section diagram in.

[0032] Figure 7 for Figure 1 DD cross-section diagram in.

[0033] Figure 1 It includes: 1-tower top telescopic boom device, 1.1-fixed bracket, 1.2-movable bracket, 1.3-telescopic mechanism, 2-tower ring clamp device, 2.1-ring frame, 2.2-track, 2.3-electric walking wheel, 2.4-lifting ear, 3-suspension operating platform, 3.1-C-shaped operating platform, 3.2-one-shaped telescopic operating platform, 3.3-U-shaped operating platform, 3.4-door-shaped operating platform, 3.5-mobile operating platform, 3.6-loop operating platform, 4-lifting rope, 5-anti-fall device fixed on the top of the tower column, 6-inclined cable, 7-parapet, 8-tower column, 9-0# cable, 10-bridge deck, 11-hanging point, 12-0# cable surface, 21-L1 hanging basket, 22- L2 hanging basket, 23-L3 hanging basket, 24-L4 hanging basket, 25-L5 intermediate hanging basket, 26-L6 sliding hanging basket, 27-L7 hanging basket. DETAILED DESCRIPTION

[0034] The following is combined with Figures 1 to 7 The present invention is further described with reference to the accompanying drawings and examples.

[0035] A certain bridge is a large-span cable-stayed bridge with a main span of 602 meters. It adopts an inverted Y-shaped tower column. The tower height above the bridge deck is about 164 meters, of which the upper straight tower column is 99 meters high and the lower forked tower column is 65 meters high. Taking this bridge as an example, the maintenance system and application of the inverted Y-shaped tower column of the cable-stayed bridge are introduced.

[0036] Example 1: Maintenance system for inverted Y-shaped tower column of cable-stayed bridge

[0037] Reference Figure 1 A maintenance system for an inverted Y-shaped tower column of a cable-stayed bridge includes a telescopic boom device 1 at the top of the tower, an annular hoop device 2 in the tower, a suspension operation platform 3, a suspension rope 4, and an anti-fall device 5 fixed to a parapet 7 at the top of the tower. The inverted Y-shaped tower column of the cable-stayed bridge is divided into four sections, namely, a straight tower column section I with a uniform cross section, a straight tower column section II with a variable cross section, a bifurcated tower column cable interference section III, and a bifurcated tower column cable non-interference section IV. Due to the different sizes of the four sections, different suspension operation platforms need to be configured during maintenance.

[0038] Reference Figure 1 , Figure 2 , 12 tower top telescopic boom devices 1 are symmetrically fixed on the parapet wall 7 at the top of the tower column. The tower top telescopic boom device 1 includes a fixed bracket 1.1, a movable bracket 1.2, and a telescopic mechanism 1.3. The movable bracket 1.2 passes through the fixed bracket 1.1, and the fixed bracket 1.1 is fixed on the parapet wall 7 of the straight tower column. The movable bracket 1.2 adjusts the length of the tower column wall through the telescopic mechanism 1.3.

[0039] Reference Figure 1 , Figure 3 The annular hoop device 2 in the tower is clamped in the middle of the inverted Y-shaped tower column by gravity, and includes an annular frame 2.1, a track 2.2, an electric running wheel 2.3, and a lifting lug 2.4.

[0040] Reference Figure 1 , Figure 4~Figure 7 The suspended operating platform 3 includes 2 C-shaped operating platforms 3.1, 2 straight telescopic operating platforms 3.2, 2 U-shaped operating platforms 3.3, 2 gate-shaped operating platforms 3.4, 2 round-shaped operating platforms 3.6 and 1 mobile operating platform 3.5, a total of 6 types of 11 operating platforms. Among them, the first operating platform set in the straight tower column equal section section includes two symmetrically arranged C-shaped operating platforms 3.1 and a straight telescopic operating platform 3.2 located between the two C-shaped operating platforms; the second operating platform set in the straight tower column variable section section includes two symmetrically arranged U-shaped operating platforms 3.3 and two straight telescopic operating platforms 3.2 located between the two U-shaped operating platforms 3.3; the third operating platform set in the forked tower column cable interference section includes two gate-shaped operating platforms 3.4 and a mobile operating platform 3.5 located between the two gate-shaped operating platforms; the fourth operating platform set in the forked tower column cable non-interference section includes two round-shaped operating platforms 3.6.

[0041] A single C-shaped operating platform is composed of one L1 hanging basket 21, and is provided with 4 hanging points 11; a single straight-line telescopic operating platform is composed of one L2 hanging basket 22, and is provided with 2 hanging points 11; a single U-shaped operating platform is composed of one L1 hanging basket 21 and two L3 hanging baskets 23, and is provided with 4 hanging points 11; a single door-shaped operating platform is composed of one L1 hanging basket 21, two L3 hanging baskets 23 and two L4 hanging baskets 24, and is provided with 6 hanging points 11; a single circular operating platform is composed of one L1 hanging basket 21, two L3 hanging baskets 23, two L4 hanging baskets 24 and one L7 hanging basket 27, and is provided with 8 hanging points 11; a single mobile operating platform is composed of one L5 intermediate hanging basket 25 and two L6 sliding hanging baskets 26, and is provided with 4 hanging points 11.

[0042] Reference Figure 1 to Figure 7The lifting points 11 of the C-shaped operating platform 3.1, the I-shaped telescopic operating platform 3.2, and the U-shaped operating platform 3.3 are all connected to the movable bracket 1.2 of the telescopic boom device 1 on the top of the tower by using the lifting rope 4; the single door-shaped operating platform 3.4 has 4 lifting points 11 connected to the movable bracket 1.2 of the telescopic boom device 1 on the top of the tower by using the lifting rope 4, and 2 lifting points 11 are connected to the lifting ears 2.4 of the annular clamp device in the tower by using the lifting rope; the single round-shaped operating platform 3.6 has 4 lifting points 11 connected to the movable bracket 1.2 of the telescopic boom device 1 on the top of the tower by using the lifting rope 4, and 4 lifting points 11 are connected to the lifting ears 2.4 of the annular clamp device 2 in the tower by using the lifting rope 4; the 4 lifting points 11 of the mobile operating platform 3.5 are all connected to the electric walking wheels 2.3 of the annular clamp device in the tower.

[0043] Reference Figure 1 , Figure 4 The I-shaped telescopic operating platform 3.2 has telescopic cantilevers on both sides. When the platform is lifted or lowered through the inclined cable 6, the cantilevers on both sides are retracted to avoid the inclined cable 6.

[0044] The mobile operating platform includes a long L5 middle hanging basket 25 and two L6 sliding hanging baskets 26. The two L6 sliding hanging baskets 26 are symmetrically hung on the upper railings and lower railings on both sides of the middle hanging basket, and slide along the L5 middle hanging basket along the bridge direction using sliding rollers.

[0045] An upper railing and a lower railing are respectively arranged on the outer sides of both sides of the L5 intermediate hanging basket; an upper hook with an opening downwards cooperating with the upper railing is arranged on the upper part of the L6 sliding hanging basket corresponding to the L5 intermediate hanging basket; a lower hook with an opening upwards cooperating with the lower railing is arranged on the lower part; sliding rollers are arranged on both sides and the top of the inner side of the upper hook; sliding rollers are arranged on both sides and the bottom of the inner side of the lower hook; the upper hook of the L6 sliding hanging basket is hung on the upper railing of the L5 intermediate hanging basket; the lower hook of the L6 sliding hanging basket is hung on the lower railing of the L5 intermediate hanging basket; an operator stands on the L5 intermediate hanging basket and manually pushes the L6 sliding hanging basket, and the L6 sliding hanging basket slides along the bridge direction along the L5 intermediate hanging basket using the sliding rollers.

[0046] Reference Figure 1 , Figure 2 Four anti-falling devices 5 are symmetrically fixed on the top of the tower column. The anti-falling device 5 includes a personnel safety rope with one end fixed on the top of the tower column and a rope locker placed in the suspended operating platform. The personnel connect the safety belt to the personnel safety rope through the rope locker. When the operating platform is raised or lowered, the rope locker slides along the personnel safety rope. When the operating platform reaches the maintenance position, the rope locker switch is pressed to lock the safety belt and the personnel safety rope.

[0047] Example 2: Maintenance of inverted Y-shaped tower column of cable-stayed bridge

[0048] The suspended operating platform is welded with high-strength aluminum alloy and equipped with wheels on the bottom. It is placed in the warehouse when not in use and pushed to the bridge deck during maintenance. It is suspended on the telescopic boom device on the top of the tower or the annular clamp device in the tower through a suspension rope. The lifting control system of the suspended operating platform is placed on the operating platform, and the maintenance personnel control the lifting of the operating platform. The high-altitude anti-fall device is set on the top of the tower column to ensure the safety of the maintenance personnel when working.

[0049] During maintenance work,

[0050] ①Inspect the vertical tower column, refer to Figure 1 First, place the operating platform 3 on the bridge deck 10, and the personnel carry the suspension rope 4 and the personnel safety rope 5.1 to reach the top of the tower from the ladder (or elevator) inside the tower; refer to Figure 2 , extend the movable bracket 1.2 out of the tower column top parapet 7 and lock it through the telescopic mechanism 1.3 of the tower top telescopic boom device 1, and lower the lifting rope 4 and the personnel safety rope 5.1; refer to Figure 1 , Figure 4 , Figure 5 , and then install the lifting rope 4 on the C-shaped operating platform 3.1, the U-shaped operating platform 3.3 and the straight telescopic operating platform 3.2. The personnel enter the operating platform, tie the safety belt to the personnel safety rope 5.1, operate the control system, and lift the operating platform to the upper straight tower column of the inverted Y tower column ( Figure 1 The maintenance position of sections Ⅰ and Ⅱ in the Figure 1 , Figure 4 , the first operating platform consisting of two C-shaped operating platforms 3.1 and two I-shaped telescopic operating platforms 3.2 is used to inspect the upper straight tower column section I. During the inspection, the I-shaped telescopic operating platform 3.2 extends the cantilever, and when it is raised and lowered through the inclined cable 6, the cantilever is retracted. Figure 1 , Figure 5 The second operating platform consisting of two U-shaped operating platforms 3.3 and two straight telescopic operating platforms 3.2 is used to overhaul the variable-section section II of the upper straight tower column. During the overhaul, the straight telescopic operating platform 3.2 adjusts the length of the extended cantilever according to the change in the width of the tower column variable section.

[0051] ②Reference Figure 1 , Figure 4 , Figure 5 , personnel take the C-shaped operating platform 3.1, U-shaped operating platform 3.3 or the straight telescopic operating platform 3.2 to reach the position of the annular hoop device 2 in the tower; refer to Figure 3 , Figure 6 , Figure 7 , hang the slings 4 of the door-shaped operating platform 3.4 and the mobile operating platform 3.5 as the third operating platform, and the circular operating platform 3.6 as the fourth operating platform on the annular hoop device 2 in the tower and lower the slings 4; refer to Figure 1 , Figure 6 , Figure 7 The lifting rope 4 is installed on the gate-shaped operating platform 3.4 and the mobile operating platform 3.5 as the third operating platform, and the circular operating platform 3.6 as the fourth operating platform. The personnel enter the operating platform and operate the control system to lift the operating platform to the lower fork tower column of the inverted Y tower column ( Figure 1 Sections III and IV in the maintenance position. Figure 1 , Figure 7 , using the circular operating platform 3.6 as the fourth operating platform to inspect and repair the non-interference section IV of the cable of the bifurcated tower column. Figure 1 , Figure 6 The three non-0# cable surfaces of the cable interference section III of the bifurcated tower column are inspected and maintained by using the door-shaped operating platform 3.4 constituting the third operating platform, and the surface 12 where the 0# cable of the cable interference section III of the bifurcated tower column is located is inspected and maintained by using the mobile operating platform 3.5 constituting the third operating platform. The mobile operating platform 3.5 uses the hoist in the operating platform to perform vertical lifting, uses the electric walking wheel 2.3 of the annular clamp device 2 in the tower to perform transverse movement to the bridge, and uses the L6 sliding hanging basket 26 of the mobile operating platform 3.5 to perform movement along the bridge, so as to avoid the 0# cable 9 and fully cover the surface 12 where the 0# cable is located.

[0052] ③After the inspection is completed, refer to Figure 1 , Figure 4~Figure 7 , lower the gate-shaped operating platform 3.4 and the mobile operating platform 3.5 as the third operating platform, and the loop-shaped operating platform 3.6 as the fourth operating platform to the bridge deck 10, release the lifting rope 4 and the personnel safety rope 5.1 of the gate-shaped operating platform 3.4, the mobile operating platform 3.5 and the loop-shaped operating platform 3.6, and the personnel take the C-shaped operating platform 3.1, the U-shaped operating platform 3.3 or the straight-line telescopic operating platform 3.2 to reach the position of the annular clamp device 2 in the tower, release the lifting rope 4 on the annular clamp device 2 in the tower, and then lower the lifting rope 4, the C-shaped operating platform 3.1, the U-shaped operating platform 3.3 and the straight-line telescopic operating platform 3.2 to the bridge deck 10, release the lifting rope 4 and the personnel safety rope 5.1 on the C-shaped operating platform 3.1, the U-shaped operating platform 3.3 and the straight-line telescopic operating platform 3.2, and after the lifting rope 4 and the personnel safety rope 5.1 are retracted at the top of the tower, the telescopic boom device 2 at the top of the tower retracts the movable bracket 1.2 into the parapet and fixes it. The personnel go down from the top of the tower to the bridge deck 10 via the ladder (or elevator) inside the tower column, and move the operating platform 3 to the warehouse, and the maintenance is completed.

[0053] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A maintenance system for an inverted Y-shaped tower column of a cable-stayed bridge, characterized in that The maintenance system includes A telescopic boom device at the top of the tower, wherein the telescopic boom device at the top of the tower is fixed on the parapet at the top of the tower column, and the telescopic boom device at the top of the tower column comprises a fixed bracket, a movable bracket, and a telescopic mechanism, wherein the movable bracket passes through the fixed bracket, and the fixed bracket is fixed on the parapet at the top of the tower column, and the telescopic mechanism is used to adjust the length of the movable bracket extending out of the tower column wall; An annular hoop device in the tower, wherein the annular hoop device in the tower is clamped in the middle of the inverted Y-shaped tower column by gravity, and the annular hoop device in the tower comprises an annular frame, a track arranged in the transverse direction below the annular frame, and an electric running wheel running along the track in the transverse direction; A suspended operating platform is provided with a plurality of suspension points, and the suspension points are connected with a telescopic boom device at the top of the tower and an annular hoop device in the tower through suspension ropes.

2. The maintenance system of the inverted Y-shaped tower column of a cable-stayed bridge according to claim 1, characterized in that: The suspended operating platform comprises a mobile operating platform, and the mobile operating platform is connected to the electric running wheel of the annular clamp device in the tower through a suspension rope.

3. The maintenance system of the inverted Y-shaped tower column of a cable-stayed bridge according to claim 1, characterized in that: The suspended operating platform at least includes one of several operating platforms arranged at different heights of the Y-shaped tower column, including a first operating platform arranged at a straight tower column section with equal cross-section, a second operating platform arranged at a straight tower column section with variable cross-section, a third operating platform arranged at a forked tower column cable interference section, and a fourth operating platform arranged at a forked tower column cable non-interference section, wherein the first operating platform includes two symmetrically arranged C-shaped operating platforms and a straight-line telescopic operating platform located between the two C-shaped operating platforms; the second operating platform includes two symmetrically arranged U-shaped operating platforms and two straight-line telescopic operating platforms located between the two U-shaped operating platforms. Platform; the third operating platform includes two door-shaped operating platforms and a mobile operating platform located between the two door-shaped operating platforms; the fourth operating platform includes two U-shaped operating platforms, among which the C-shaped operating platform, the I-shaped telescopic operating platform, and the U-shaped operating platform are all connected to the movable bracket of the telescopic boom device on the top of the tower by a lifting rope, a single door-shaped operating platform is connected to the movable bracket of the telescopic boom device on the top of the tower and the annular hoop device in the tower by a lifting rope, a single U-shaped operating platform is connected to the movable bracket of the telescopic boom device on the top of the tower and the annular hoop device in the tower by a lifting rope, and the mobile operating platform is connected to the electric walking wheel of the annular hoop device in the tower by a lifting rope.

4. The maintenance system of the inverted Y-shaped tower column of a cable-stayed bridge as claimed in claim 3, characterized in that: The C-shaped operating platform is composed of a C-shaped L1 hanging basket, and the I-shaped telescopic operating platform is composed of an I-shaped telescopic L2 hanging basket; the U-shaped operating platform includes a C-shaped L1 hanging basket, and the protrusions at both ends of the C-shaped L1 hanging basket are respectively connected to an I-shaped L3 hanging basket; the door-shaped operating platform includes a C-shaped L1 hanging basket, and the protrusions at both ends of the C-shaped L1 hanging basket are sequentially connected to an I-shaped L3 hanging basket and an I-shaped L4 hanging basket; the mobile operating platform includes an I-shaped L5 middle hanging basket and L6 hanging baskets that are arranged on both sides of the L5 middle hanging basket and can slide along the bridge along both sides of the L5 middle hanging basket; the round-shaped operating platform includes a C-shaped L1 hanging basket, The straight-line L7 hanging basket is arranged on the opposite side of the C-shaped L1 hanging basket, and the protruding parts at both ends of the C-shaped L1 hanging basket are connected to the L7 hanging basket through the straight-line L3 hanging basket and the straight-line L4 hanging basket in sequence.

5. The maintenance system of the inverted Y-shaped tower column of a cable-stayed bridge according to claim 1, characterized in that: The suspended operating platform is equipped with a hoist for driving the operating platform to move up and down, an operating control system, and a rope collector.

6. The maintenance system of the inverted Y-shaped tower column of a cable-stayed bridge according to claim 1, characterized in that: The lifting ropes include working lifting ropes and safety lifting ropes. Each lifting point is provided with a working lifting rope and a safety lifting rope. The suspended operating platform is provided with a safety lock used in conjunction with the safety lifting rope. During normal use, the working lifting rope bears force and the safety lifting rope is retracted and released accordingly. When the working lifting rope breaks in danger, the safety lifting rope starts to bear force and automatically starts the safety lock for braking to prevent the operating platform from continuing to descend.

7. The maintenance system for the inverted Y-shaped tower column of a cable-stayed bridge according to claim 1, characterized in that: The maintenance system includes an anti-fall device, which includes a personnel safety rope with one end fixed to the top of the tower column and a rope lock placed in the suspended operating platform. The rope lock is used to connect the operator's safety belt to the personnel safety rope. When the operating platform is raised or lowered, the rope lock slides along the personnel safety rope. When the operating platform reaches the maintenance position, the rope lock switch is pressed to lock the safety belt and the personnel safety rope.

8. A maintenance method for an inverted Y-shaped tower column of a cable-stayed bridge, characterized in that The method comprises the following steps:

1. to inspect the vertical tower column, firstly, a suspended operating platform is placed on the bridge deck, a person carries a lifting rope and a personnel safety rope to the top of the tower column, and the movable bracket is extended out of the parapet at the top of the tower column and locked through the telescopic mechanism of the telescopic boom device at the top of the tower column, the lifting rope and the personnel safety rope are lowered, and then the lifting rope is installed on the C-shaped operating platform, the U-shaped operating platform and the straight telescopic operating platform, the person enters the suspended operating platform, fastens the safety belt to the personnel safety rope, operates the control system, and lifts the operating platform to the inspection position of the upper vertical tower column of the inverted Y tower column; the first operating platform composed of two C-shaped operating platforms and two straight telescopic operating platforms is used to inspect the equal-section sections of the upper vertical tower column; during the inspection, the straight telescopic operating platform extends the cantilever, and the lifting and lowering When passing through the inclined cable, the cantilever is retracted; the second operating platform composed of two U-shaped operating platforms and two straight telescopic operating platforms is used to inspect the variable-section section of the upper straight tower column. During the inspection, the straight telescopic operating platform adjusts the length of the extended cantilever according to the change in the width of the tower column variable section; ② When inspecting the bifurcated tower column, personnel take the C-shaped operating platform, U-shaped operating platform or straight telescopic operating platform to the position of the annular clamp device in the tower, hang the slings of the gate-shaped operating platform and the mobile operating platform as the third operating platform, and the loop-shaped operating platform as the fourth operating platform on the ring-shaped clamp device in the tower and lower the slings, and install the slings on the gate-shaped operating platform and the mobile operating platform as the third operating platform, and the loop-shaped operating platform as the fourth operating platform On the platform, the personnel enter the operating platform and operate the control system to lift the third operating platform and the fourth operating platform to the maintenance position of the lower forked tower column of the inverted Y tower column, and use the circular operating platform as the fourth operating platform to inspect the non-interference section of the forked tower column cable, and use the door-shaped operating platform constituting the third operating platform to inspect the three non-cable surfaces of the interference section of the forked tower column cable, and use the mobile operating platform constituting the third operating platform to inspect the surface where the cable of the interference section of the forked tower column cable is located. The mobile operating platform uses the hoist in the operating platform to perform vertical lifting and lowering, uses the electric walking wheels of the annular clamp device in the tower to move horizontally to the bridge, and uses the sliding hanging baskets on both sides of the mobile operating platform to move along the bridge, so as to avoid the cables and repair the cables. Full coverage maintenance of the bridge surface; ③ After the maintenance is completed, the third and fourth operating platforms are lowered to the bridge deck, the lifting ropes and personnel safety ropes of the third and fourth operating platforms are released, and the personnel take the C-shaped operating platform, U-shaped operating platform or I-shaped telescopic operating platform to the position of the annular clamp device in the tower, release the lifting rope on the annular clamp device in the tower, and then lower the lifting rope, C-shaped operating platform, U-shaped operating platform and I-shaped telescopic operating platform to the bridge deck, release the lifting ropes and personnel safety ropes of the C-shaped operating platform, U-shaped operating platform and I-shaped telescopic operating platform, and after the lifting ropes and personnel safety ropes are retracted at the top of the tower, the telescopic boom device at the top of the tower retracts the movable bracket into the parapet and fixes it; the personnel go down from the top of the tower to the bridge deck, move the operating platform to the warehouse, and the maintenance is completed.

9. The maintenance method according to claim 8, characterized in that The I-shaped telescopic operating platform is provided with telescopic cantilevers on both sides. When the platform is raised or lowered through the inclined cables, the cantilevers on both sides are retracted to avoid the inclined cables.

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