A telescopic and rotating maintenance platform at the top of a main tower of a long-span cable-stayed bridge

Abstract

The application discloses a telescopic and rotating maintenance platform for the top of a main tower of a long-span cable-stayed bridge, which comprises supporting legs, lifting frames, a sliding system, a middle tower, a rotating frame system, a construction platform plate and a hanging basket cross beam, the supporting legs are fixedly connected to the existing structure of the top of the tower and are used for supporting the lifting frames, the sliding system slides horizontally along the lifting frames, the middle tower is fixed to the sliding system, a pair of the rotating frame systems are arranged on the opposite sides of the middle tower and are rotationally connected with the middle tower, the construction platform plate is detachably arranged on the bottom surface of the rotating frame, the hanging basket cross beam is arranged on the top surface of the rotating frame, the hanging basket cross beam is used for hoisting a hanging basket through a steel wire rope of the hanging basket, and the hanging basket is arranged to pass through from the bottom surface of the rotating frame to the position directly below the rotating frame. The application effectively guarantees the personal safety of workers, avoids the risk of falling objects in the air, and effectively solves the problems of the safety risk of repeated installation and resource waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge maintenance. More particularly, the present application relates to a telescopic and rotating maintenance platform for the top of a main tower of a long-span cable-stayed bridge. BACKGROUND

[0002] Cable-stayed bridges are the most common type of long-span bridges, and the design service life of most cable-stayed bridges is 100 years or even 120 years. In order to achieve the 100-year service life of the bridge, the maintenance and repair of key load-bearing structures such as the main tower, the cable system, and the main girder of the bridge are particularly important. With the increase in span, the height of the main tower and the length of the cable also increase, making it more and more difficult to perform inspection and maintenance operations by hand.

[0003] For bridges built in the early stage, due to the influence of the concept of attaching importance to bridge construction and neglecting bridge maintenance, safe, reliable, and accessible maintenance channels have not been considered for important structures such as the high tower and the cable of the bridge. In particular, for the maintenance of the high tower and the cable tower end cable guide pipe mouth (such as the PE and wedge block damper at the cable guide pipe mouth), the current method mainly uses a simple cantilever beam system set up on the tower top and a matching external tower basket as a manned platform for operation. The cantilever beam system is a temporary structure with a simple structure and poor safety. It also requires drilling holes and anchoring on the outer wall of the tower crown, which makes it difficult to ensure the safety of the operating personnel and increases the risk of falling objects from a high altitude, seriously affecting the safety of vehicles on the bridge. The cantilever beam system is dismantled after the maintenance operation is completed, without considering subsequent maintenance operations, resulting in multiple installation and dismantling and resource waste. The existing tower top cantilever beam system + external tower basket mode does not meet the maintenance goals and requirements of the 100-year service life of the main tower and cable system of the long-span cable-stayed bridge. SUMMARY

[0004] An object of the present application is to provide a telescopic and rotating maintenance platform for the top of a main tower of a long-span cable-stayed bridge, which solves the current situation of the lack of a maintenance channel at the top of the existing long-span cable-stayed bridge. The maintenance platform is based on the existing platform at the top of the tower for its own splicing and installation, without the need for drilling holes and anchoring on the outer wall of the tower crown, effectively ensuring the safety of the operating personnel and avoiding the risk of falling objects from a high altitude. The main structure of the tower top platform can be reused on the tower top, effectively solving the safety risks and resource waste of repeated installation.

[0005] In order to achieve the purposes and other advantages according to the present application, a large-span cable-stayed bridge main tower top telescopic rotating maintenance platform is provided, which comprises a support leg, a lifting frame, a sliding system, a middle portal frame, a rotating frame system, a construction platform plate and a basket beam, the support leg is fixedly connected to the existing structure of the tower top, the support leg is provided with multiple support legs and is used for supporting the lifting frame, the sliding system slides horizontally along the top surface of the lifting frame, the middle portal frame is fixed to the sliding system, the rotating frame system is provided with a pair of rotating frame systems on the opposite sides of the middle portal frame and is rotationally connected to the middle portal frame, when a pair of rotating frame systems is rotated to an open state, a T-shaped structure is formed with the lifting frame, when a pair of rotating frame systems is rotated to a recovery state, the rotating frame systems are located on the two sides above the lifting frame, the construction platform plate is detachably arranged on the bottom surface of the rotating frame, the basket beam is arranged on the top surface of the rotating frame, the basket beam is used for hoisting a basket through a basket steel wire rope, and the basket is arranged to pass through from the bottom surface of the rotating frame to the position directly below the rotating frame.

[0006] Preferably, the support leg comprises an anchor plate and a lower stand column, the support leg is anchored to the existing structure of the tower top through the anchor plate, and the lower stand column is vertically fixed to the center of the anchor plate.

[0007] Preferably, the lower stand column is provided with multiple support leg pin shaft through holes in the height direction thereof, the lifting frame comprises multiple upper stand columns and a beam frame, the multiple upper stand columns are correspondingly sleeved on the multiple lower stand columns of the multiple support legs, the top ends of the multiple lower stand columns are connected to the beam frame, the lower stand column is provided with lifting frame pin shaft through holes with the same hole diameter as the support leg pin shaft through holes, and the upper stand column and the lower stand column are connected through a pin shaft arranged in the lifting frame pin shaft through hole.

[0008] Preferably, the lifting frame further comprises a rod assembly arranged between the upper stand columns at the two ends of the beam frame, the rod assembly is connected to a corresponding pair of upper stand columns and the beam frame, and the rod assembly and the support leg at one end of the lifting frame are further provided with a jacking screw system, which comprises a connecting beam, a pair of screw rod bodies and multiple screw nuts, the two ends of the connecting beam are respectively fixed to the lower stand columns of a pair of support legs, the lower ends of the pair of screw rod bodies are respectively fixed to the connecting beam, the upper ends are respectively vertically passed through the end beam of the rod assembly, and the screw rod body is threadedly sleeved with one screw nut on the upper and lower surfaces of the end beam.

[0009] Preferably, the longitudinal beams on the two sides of the beam frame are in an I-shaped structure, the sliding system comprises a sliding frame beam and multiple C-shaped sliding grooves, the multiple C-shaped sliding grooves are fixed to the lower surface of the sliding frame beam and are downwardly opened and sleeved on the flange plates of the beam frame in the I-shaped structure.

[0010] Preferably, the middle portal frame is in a portal structure and is fixed to one end of the sliding frame beam.

[0011] Preferably, the rotating frame system comprises an inner rotating truss, an outer rotating truss and an end rotating truss, two ends of the end rotating truss are hinged with one end of the inner rotating truss and the outer rotating truss respectively, and the other end of the inner rotating truss and the outer rotating truss are hinged with one side of the middle portal respectively, so that one side of the inner rotating truss, the outer rotating truss, the end rotating truss and the middle portal forms an angle-adjustable parallelogram structure.

[0012] Preferably, the bottom beams of the inner rotating truss, the outer rotating truss and the end rotating truss form the lower chords of the rotating frame system, and the construction platform plate is directly placed on the lower chords, and the construction platform plate is a structure sequentially spliced by multiple plate bodies.

[0013] Preferably, the top beams of the inner rotating truss, the outer rotating truss and the end rotating truss form the upper chords of the rotating frame system, the basket cross beams are inverted U-shaped structures and are fixed on the upper chords by C-shaped connecting plates, and the basket cross beams are provided with basket steel wire rope anchoring points for anchoring the basket steel wire ropes.

[0014] Preferably, the sliding system, the middle portal and the rotating frame system are arranged at both ends of the lifting frame.

[0015] The present application at least includes the following beneficial effects:

[0016] (1) The maintenance platform of the present application is connected and stressed with the main tower structure only through the leg structure, and the leg structure is inside the existing tower top platform, avoiding drilling and anchoring on the main tower top and tower wall, and the safety risk is controllable;

[0017] (2) The maintenance platform of the present application is a truss structure, and the jacking and rotating actions are realized by mature and reliable lead screws and hinges, without additional hydraulic jacking, electric control and other auxiliary systems, and the structure is simple and clear in stress, and low in processing and manufacturing cost.

[0018] (3) The maintenance platform of the present application can be rotated, recycled and lowered in the reverse order of the splicing and use after the maintenance operation is completed, so that the overall structure is contracted into the tower crown, and the auxiliary structure of the permanent structure is placed on the tower top, and the main tower can be directly used for detection and maintenance in the later period, avoiding the safety risk of repeated disassembly.

[0019] Other advantages, objects and features of the present application will be embodied partly through the following description, and will be understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the maintenance platform of the present application;

[0021] Figure 2 Fig. 1 is a schematic diagram of the outrigger structure of the present application;

[0022] Figure 3 Fig. 2 is a schematic diagram of the lifting frame structure of the present application;

[0023] Figure 4 Fig. 3 is a schematic diagram of the jacking screw system structure of the present application;

[0024] Figure 5 Fig. 4 is a schematic diagram of the sliding system structure of the present application;

[0025] Figure 6 Fig. 5 is a schematic diagram of the mid-gantry structure of the present application;

[0026] Figure 7 Fig. 6 is a schematic diagram of the rotating frame system structure of the present application;

[0027] Figure 8 Fig. 7 is a schematic diagram of the rotating frame system after opening and assembled with the platform plate and the basket crossbeam structure of the present application;

[0028] Figure 9 Fig. 8 is a schematic diagram of the basket crossbeam and the basket system connection of the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1. outrigger, 1-1 anchor plate, 1-2 lower upright, 1-3 outrigger pin shaft through hole, 2 lifting frame, 2-1 upper upright, 2-2 crossbeam frame, 2-3 bar assembly, 2-4 lifting frame pin shaft through hole, 2-5 longitudinal beam, 3 jacking screw system, 3-1 connecting beam, 3-2 screw rod body, 3-3 screw nut, 4 sliding system, 4-1 sliding frame beam, 4-2 C-shaped sliding groove, 5 mid-gantry, 6 rotating frame system, 6-1 lower chord, 6-2 upper chord, 6-3 inner rotating truss, 6-4 outer rotating truss, 6-5 end rotating truss, 7 construction platform plate, 8 basket crossbeam, 8-1 C-shaped connecting plate, 8-2 basket, 8-3 basket steel wire rope, 9 basket steel wire rope anchoring point. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement the present application according to the description and drawings.

[0032] It should be noted that the experimental methods described in the following embodiments are conventional methods, and the reagents and materials are commercially available unless otherwise specified. In the description of the present application, the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] As shown in Figures 1 to 9 The present application provides a large-span cable-stayed bridge main tower top telescopic rotating maintenance platform, including leg 1, lifting frame 2, sliding system 4, middle door frame 5, rotating frame system 6, construction platform plate 7 and basket crossbeam 8, the leg 1 is fixedly connected to the existing structure on the tower top, the leg 1 is provided with multiple and used for supporting the lifting frame 2, the sliding system 4 slides horizontally along the top surface of the lifting frame 2, the middle door frame 5 is fixed on the sliding system 4, the rotating frame system 6 is provided with a pair on the opposite sides of the middle door frame 5 and is rotationally connected with the middle door frame 5, a pair of rotating frame systems 6 rotates to the open state and forms a T-shaped structure with the lifting frame 2, a pair of rotating frame systems 6 rotates to the recovery state and is located on the two sides above the lifting frame 2, the construction platform plate 7 is detachably arranged on the bottom surface of the rotating frame, the basket crossbeam 8 is arranged on the top surface of the rotating frame, the basket crossbeam 8 is used for hoisting the basket 8-2 through the basket steel wire rope 8-3, the basket 8-2 is arranged to pass from the bottom surface of the rotating frame to the directly below.

[0034] In the above technical solution, the use process of the maintenance platform of the application is as follows: the telescopic and rotating maintenance platform lifting frame 2 at the top of the large-span cable-stayed bridge main tower is in the lowest position and the rotating frame system 6 is in the retracted state after splicing is completed, the lifting frame 2 is lifted to the predetermined height by using the lower lead screw nut 3-3 after splicing is checked and no error is found, then the rotating frame system 6 is rotated to open and the construction platform plate 7 and the hanging basket cross beam 8 are connected and placed, thereby forming a high tower top working platform. The hanging basket 8-2 for transporting scattered parts is spliced into a complete structure according to the requirements on the high tower top working platform, and the hanging basket steel wire rope 8-3 is connected with the hanging basket steel wire rope anchoring point 9 to make the hanging basket 8-2 away from the construction platform plate 7 by a certain distance; the sliding system 4 is pushed to the predetermined position and is temporarily anchored to the longitudinal beam 2-5 of the lifting frame 2. When the hanging basket 8-2 needs to be used for maintenance or work, the worker enters the hanging basket 8-2 in advance, then the construction platform plate 7 is opened according to the size of the hanging basket 8-2, thereby forming a channel for lifting the hanging basket 8-2, the worker operates the power system of the hanging basket 8-2 to descend from the channel and move up and down along the tower wall of the main tower of the bridge to perform the predetermined maintenance or repair work.

[0035] In another technical solution, as shown in Figure 2 , the leg 1 includes an anchor plate 1-1 and a lower column 1-2, the leg 1 is anchored to the existing structure at the top of the tower through the anchor plate 1-1, and the lower column 1-2 is fixed vertically at the center of the anchor plate 1-1. The anchor plate 1-1 is provided with a hole and is anchored and connected with the existing structure at the top of the tower by the form of planted steel bars or expansion bolts, and the anchor plate 1-1 is vertically welded with the lower column 1-2.

[0036] In another technical solution, as shown in Figure 2 and Figure 3 , the lower column 1-2 is provided with a plurality of leg pin shaft through holes 1-3 at intervals along the height direction thereof, the lifting frame 2 includes a plurality of upper columns 2-1 and a beam frame 2-2, the plurality of upper columns 2-1 are correspondingly sleeved on the plurality of lower columns 1-2 of the plurality of legs 1, the top ends of the plurality of lower columns 1-2 are fixedly welded with the beam frame 2-2, the lower column 1-2 is provided with lifting frame pin shaft through holes 2-4 with the same hole diameter as the leg pin shaft through holes 1-3, and the upper column 2-1 and the lower column 1-2 are connected through the pin shafts arranged in the lifting frame pin shaft through holes 2-4. The lower column 1-2 is provided with the leg pin shaft through hole 1-3 at intervals, the upper column 2-1 and the lower column 1-2 can be both provided as square tube structures and are matched by sleeving each other, the leg pin shaft through holes 1-3 at different heights are connected with the lifting frame pin shaft through holes 2-4 provided on the upper column 2-1 through the pin shafts, thereby achieving the height adjustment of the lifting frame 2.

[0037] In another technical solution, as shown in Figure 4As shown, the lifting frame 2 also includes a bar assembly 2-3 arranged between the upper upright columns 2-1 at both ends of the cross beam frame 2-2, the bar assembly 2-3 being connected to a corresponding pair of upper upright columns 2-1 and cross beam frame 2-2, and the bar assembly 2-3 and the support leg 1 at one end of the lifting frame 2 are also provided with a jacking screw system 3, which includes a connecting beam 3-1, a pair of screw rod bodies 3-2 and a plurality of screw nuts 3-3, both ends of the connecting beam 3-1 being fixed to the lower upright columns 1-2 of a pair of support legs 1, respectively, the lower ends of a pair of screw rod bodies 3-2 being fixed to the connecting beam 3-1, respectively, and the upper ends being vertically passed through the end cross beam of the bar assembly 2-3, respectively, and the screw rod body 3-2 being threadedly sleeved with a screw nut 3-3 on the upper and lower surfaces of the end cross beam. The bar assembly 2-3 mainly serves to increase the connection firmness and reliability of the upper upright column 2-1 and the cross beam frame 2-2, and the specific structure is shown in the figure, which is composed of a plurality of beams connected in combination, the lowest beam being a short cross beam, the connecting beam 3-1 being fixedly connected at both ends by a pin shaft and the lower upright column 1-2, the screw rod body being passed through the end cross beam and connected by the screw nut 3-3, and the lifting frame 2 being moved upward by the screw nut 3-3 through the adjustment of the screw nut 3-3 below, so as to realize the height adjustment of the lifting frame 2.

[0038] In another technical solution, as shown in Figure 5 The longitudinal beams 2-5 on both sides of the cross beam frame 2-2 are in an I-shaped structure, the sliding system 4 includes a sliding frame beam 4-1 and a plurality of C-shaped sliding grooves 4-2, the plurality of C-shaped sliding grooves 4-2 being fixedly welded to the lower surface of the sliding frame beam 4-1 and having openings downward and sleeved on the flange plates of the I-shaped cross beam frame 2-2. The sliding system 4 is moved horizontally on the cross beam frame 2-2 by sleeving the C-shaped sliding grooves 4-2, and the plurality of C-shaped sliding grooves 4-2 are symmetrically and spacedly arranged on both sides of the cross beam frame 2-2.

[0039] In another technical solution, as shown in Figure 6 The middle door frame 5 is in a door-shaped structure and is fixed to one end of the sliding frame beam 4-1.

[0040] In another technical solution, as shown in Figure 7As shown, the rotating frame system 6 includes an inner rotating truss 6-3, an outer rotating truss 6-4, and an end rotating truss 6-5, two ends of the end rotating truss 6-5 are hinged with one end of the inner rotating truss 6-3 and the outer rotating truss 6-4 respectively, and the other end of the inner rotating truss 6-3 and the outer rotating truss 6-4 are hinged with one side of the middle portal 5 respectively, so that the inner rotating truss 6-3, the outer rotating truss 6-4, the end rotating truss 6-5 and one side of the middle portal 5 form an angle-adjustable parallelogram structure, which can be rotated to open or retract around the portal structure of one side of the middle portal 5, and the included angle between the inner rotating truss 6-3 and the outer rotating truss 6-4 and the end rotating truss 6-5 is close to 0 or 180 degrees when retracted, and the overall structure of the retracted is small.

[0041] In another technical solution, as shown in Figure 8 As shown, the rotating frame system 6 forms a bottomless square fence after opening, the bottom beams of the inner rotating truss 6-3, the outer rotating truss 6-4 and the end rotating truss 6-5 form the lower chord 6-1 of the rotating frame system 6, and the construction platform plate 7 is directly placed on the lower chord 6-1, the construction platform plate 7 is a structure formed by sequentially splicing a plurality of plate bodies, and one or more plate body structures can be temporarily opened according to actual needs.

[0042] In another technical solution, as shown in Figure 8 and Figure 9 As shown, the top beams of the inner rotating truss 6-3, the outer rotating truss 6-4 and the end rotating truss 6-5 form the upper chord 6-2 of the rotating frame system 6, the hanging basket cross beam 8 is a inverted U-shaped structure and is fixed on the upper chord 6-2 in a plurality of bolt connection forms through a C-shaped connecting plate 8-1, and the hanging basket cross beam 8 is provided with a hanging basket steel wire rope anchoring point 9 for anchoring the hanging basket steel wire rope 8-3.

[0043] In another technical solution, as shown in Figure 1 As shown, the sliding system 4, the middle portal 5 and the rotating frame system 6 are provided at both ends of the lifting frame 2.

[0044] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge, characterized in that: The cam is mounted on a support frame, and the support frame is mounted on a support frame. The support frame is mounted on a support frame, and the support frame is mounted on a support frame. The support frame is mounted on a support frame, and the support frame is mounted on a support frame.

2. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 1 is characterized in that: The support leg includes an anchor plate and a lower column. The support leg is anchored to the existing structure of the tower top through the anchor plate, and the lower column is vertically fixed to the center of the anchor plate.

3. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 2 is characterized in that: The lower column is provided with a plurality of leg pin shaft through holes spaced apart along its height direction. The lifting frame includes a plurality of upper columns and a crossbeam frame. The plurality of upper columns are correspondingly mounted on the plurality of lower columns of the plurality of legs. The top ends of the plurality of lower columns are connected to the crossbeam frame. The lower columns are provided with lifting frame pin shaft through holes with the same diameter as the leg pin shaft through holes, and the upper columns and the lower columns are connected by passing a pin shaft through the through holes.

4. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 3 is characterized in that: The lifting frame also includes a rod assembly, which is arranged between the upper columns at both ends of the beam frame. The rod assembly is connected to the corresponding pair of upper columns and the beam frame. A lifting screw system is also provided on the rod assembly and the support legs at one end of the lifting frame, which includes a connecting beam, a pair of screw bodies and a plurality of screw nuts. The two ends of the connecting beam are respectively fixed to the lower columns of a pair of support legs, the lower ends of a pair of screw bodies are respectively fixed to the connecting beam, and the upper ends are respectively vertically passed through the end beams of the rod assembly, and the screw bodies are threaded with a screw nut on the upper and lower surfaces of the end beams.

5. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge as claimed in claim 3 is characterized in that: The longitudinal beam cross-sections on both sides of the crossbeam frame are I-shaped structures. The sliding system includes a sliding frame beam and multiple C-shaped slide grooves. The multiple C-shaped slide grooves are fixed on the lower surface of the sliding frame beam and their openings are downward and sleeved on the I-shaped crossbeam frame flange plate.

6. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 5, characterized in that: The middle door frame is a door-type structure and is fixed to one end of the sliding frame beam.

7. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 1, characterized in that: The rotating frame system includes an inner rotating truss, an outer rotating truss and an end rotating truss. The two ends of the end rotating truss are respectively hinged to one end of the inner rotating truss and the outer rotating truss, and the other ends of the inner rotating truss and the outer rotating truss are respectively hinged to one side of the middle portal frame, so that the inner rotating truss, the outer rotating truss, the end rotating truss and one side of the middle portal frame form a parallelogram structure with adjustable angles.

8. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 7, characterized in that: The bottom beams of the inner rotating truss, the outer rotating truss and the end rotating truss form the lower chord of the rotating frame system. The construction platform plate is directly placed on the lower chord. The construction platform plate is a structure formed by splicing multiple plates in sequence.

9. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 7, characterized in that: The top beams of the inner rotating truss, the outer rotating truss and the end rotating truss form the upper chord of the rotating frame system. The hanging basket cross beam is an inverted U-shaped structure and multiple are fixed on the upper chord through C-shaped connecting plates. The hanging basket cross beam is provided with a hanging basket wire rope anchoring point, which is used to anchor the hanging basket wire rope.

10. The telescopic and rotary maintenance platform on the top of the main tower of a long-span cable-stayed bridge according to claim 1, characterized in that: The sliding system, the middle door frame and the rotating frame system are all arranged at both ends of the lifting frame.

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