Urban rail elevated bridge Y-shaped vase pier shaft reinforcement cage integral hoisting construction method

Abstract

A kind of urban rail viaduct Y-shaped vase pier pier body reinforcement cage integral hoisting construction method, comprising the following steps: S1, reinforcement cage is made according to design drawing in reinforcement field;S2, reinforcement cage is reinforced;S3, hoisting point design and reinforcement;S4, reinforcement cage hoisting;S5, reinforcement cage is lowered, and reinforcement cage is transported to pier position before, and survey personnel is in advance in the bottom of pile cap lofting out pier column contour boundary line and is marked with red paint, when reinforcement cage is lowered, the bottom of anchoring reinforcement that extends into pile cap is aligned after deducting the protective layer of pier column contour line, and worker is in the top of pile cap and looks up plumb line to check the perpendicularity of reinforcement cage, and is welded and connected after adjusting with the vertical reinforcement of pile cap frame;S6, reinforcement cage is fixed.

Description

Technical Field

[0001] This application relates to the technical field of overall hoisting construction of the steel reinforcement cage of the Y-shaped vase pier of an urban rail viaduct, and more specifically, to a method for overall hoisting construction of the steel reinforcement cage of the Y-shaped vase pier of an urban rail viaduct. Background Technology

[0002] Integral hoisting refers to the process of lifting equipment or components after they have been assembled into a whole. It is commonly used in the hoisting of relatively stable steel structures and precast structures, and has a long history of experience in my country's construction industry. For cast-in-place structures, the basic process follows a fixed procedure of on-site rebar tying, formwork erection, and concrete pouring. This is suitable for projects with relatively relaxed site conditions and time constraints, but it presents numerous challenges in urban bridge construction. In the construction of elevated rail transit bridges, municipal elevated bridges, and similar urban bridges, there are difficulties such as high requirements for traffic management, high standards of safe and civilized construction, and tight schedules. Therefore, bridge structures are often designed as precast structures during the design phase to avoid these problems through integral hoisting. Cast-in-place structures, however, require a new construction method during the construction phase to avoid or mitigate these issues.

[0003] Investigations revealed that while other construction approaches for the integral hoisting of pier reinforcement cages have emerged in recent years to address the aforementioned traditional problems, these approaches invariably suffer from either simple structures and load-bearing structures, or lax requirements for construction site and process control, resulting in limited applicability. During the construction of urban rail viaducts or municipal viaducts, challenges such as maintaining road access along the route, occupying temporary lanes, difficulties in off-site transportation, and varied landscape structural forms often arise. These issues cause varying degrees of inconvenience to construction. Therefore, to adapt to higher standards and construction conditions, this paper presents a method for the integral hoisting of the reinforcement cage of a Y-shaped vase-shaped pier for urban rail viaducts.

[0004] This invention addresses the shortcomings of traditional cast-in-place structure construction, such as high safety risks, low site requirements, long construction period, and limited applicability and low construction standards in similar steel cage hoisting processes. It proposes a method for hoisting the steel cage of the Y-shaped vase pier body of urban rail viaducts. Summary of the Invention

[0005] The main purpose of this application is to provide a method for hoisting the steel cage of the Y-shaped vase pier of an urban rail viaduct as a whole, which solves the shortcomings of traditional cast-in-place structure construction, such as high safety risks, low site requirements, long construction period, and the limited applicability and low construction standards of similar steel cage hoisting processes.

[0006] To achieve the above objectives, firstly, this application provides a method for the integral hoisting of the reinforcing cage of the Y-shaped vase-shaped pier body of an urban rail viaduct, comprising the following steps:

[0007] S1. Fabricate steel cages at the steel yard according to the design drawings, either as a whole or in sections, and then transport each section to the site for splicing.

[0008] S2. Reinforcing steel cage: Diagonal reinforcing bars with a diameter greater than or equal to the main reinforcement bar diameter of the pier column are welded to the inner sides of the four sides of the reinforcing cage and spot-welded to the main reinforcement bar. The diagonal reinforcing bars are arranged crosswise inside the reinforcing cage.

[0009] S3. Lifting point design and reinforcement: Four lifting points are set at the top of the steel cage, and two lifting points are set at each "Y" opening. The number of stirrups at the lifting points is increased and spot-welded to the main reinforcement.

[0010] S4. Lifting of steel cages: The steel cages are first transported off-site and then transferred to the site by unloading. When unloading the steel cages, a trial lift is first performed. The trial lift height is ≤20cm from the bottom of the truck bed. The wire ropes, shackles and crane performance are checked. Lifting is carried out after ensuring safety. The lifting during the unloading process adopts the method of lifting and placing the steel cages horizontally with uniform force at 4 points. Before unloading the steel cages, wooden boards are placed at the bottom to prevent them from being bumped.

[0011] Afterwards, the steel cage is rotated vertically. After unloading, the crane hook is connected to the lifting equipment assembly via a wire rope. The lifting equipment assembly is then connected to the lifting point at the top of the steel cage via a wire rope. The crane hook wire rope is hung at the lifting ring at the top of the pier, and the crane hook wire rope is hung on the main reinforcement at 1 / 3 of the height of the pier column. The crane hooks are lifted to about 5m at the same time. The crane hook is slowly raised and lifted, while the crane hook is slowly lowered until the steel cage is flipped to a vertical position. The crane hook is then removed, and the crane hook is slowly rotated to the designed position of the pier column and slowly lowered until the designed elevation is reached.

[0012] S5. Before the steel cage is transported to the pier, the surveyors lay out the outline of the pier column on the bottom of the pier cap and mark it with red paint. When the steel cage is lowered, the bottom of the anchor steel bar that extends into the pier cap is aligned with the outline of the pier column after deducting the protective layer. The workers hang a plumb line on the top of the pier cap to check the verticality of the steel cage. After adjustment, it is welded to the steel bar erected on the pier cap.

[0013] S6. Fixing the reinforcing cage.

[0014] Further improvements include step S6, which involves pre-welding the support reinforcement bars at the bottom of the pier cap, welding the support reinforcement bars to the bottom reinforcement bars of the pier cap, welding the main reinforcement bars of the pier column to the support reinforcement bars, lap welding length ≥10d, and fixing the pier column reinforcement cage with four guy ropes in a cross shape, with the angle between the guy ropes and the vertical line controlled at 45-60°.

[0015] A further improvement is that one end of the guy rope is attached to the main reinforcement bar of the steel cage using a round steel hook, and the other end is fixed to the ground anchor block using a hand-operated hoist, ensuring that the steel cage is firmly fixed and does not tilt or shift during the pouring of the foundation concrete.

[0016] A further improvement is that step S2 also includes bending the end reinforcement at the top opening of the irregular pier column inward, arranging the main hook lifting points in the stirrup area below the bending point, the horizontal spacing of the main hook lifting points being consistent with the length of the lifting tool; and setting two horizontal reinforcing bars at the lifting points, the horizontal reinforcing bars being spot welded to the main reinforcement of the pier column.

[0017] A further improvement is that the process between steps S3 and S4 includes crane support. The steel cage is unloaded using a 75t truck crane with a horizontal lifting mechanism. The crane outriggers are supported by 0.5×0.5m steel plates or sleepers, and the distance between the crane outriggers and the edge of the pit is not less than 1.5m.

[0018] A further improvement is that the lifting device assembly includes a lifting device body, two lifting lugs fixedly disposed on the lifting device body, an upper lifting rope fixedly connected to the upper end of each lifting lug, and a lower lifting rope fixedly connected to the lower end of each lifting lug. A positioning structure is provided between the lower lifting rope and the lifting device body. The positioning structure includes a plurality of conical positioning holes opened at the bottom of the lifting device body along its length direction, and a positioning block fixedly disposed on the lower lifting rope. A through hole is opened on the bottom surface of the lifting lug. The positioning block includes a first conical part and a second conical part. The first conical part cooperates with the conical positioning hole. The maximum size of the second conical part is larger than the size of the through hole. The lower lifting rope passes through the through hole.

[0019] A further improvement is that the conical positioning hole is a conical hole, and both the first conical part and the second conical part are frustum structures.

[0020] A further improvement is that the lifting device body is welded from two spreader beams, and both the upper and lower lifting ropes are steel wire ropes. The upper lifting rope has two ropes, both of which are connected to the hook, and the lower lifting rope has four ropes, which are fixedly connected to the corresponding positioning blocks in pairs.

[0021] A further improvement is that the lifting lug includes a supporting base plate and supporting side plates fixedly disposed on both sides of the supporting base plate. The through hole is opened on the supporting base plate, and round steel bars are welded and fixed to both sides of the supporting base plate and the two supporting side plates.

[0022] A further improvement is that each of the lowering ropes is also fixedly connected to the lifting lug with an auxiliary reinforcing rope.

[0023] This invention provides a method for the overall hoisting of the reinforcing cage of the Y-shaped vase-shaped pier of an urban rail viaduct. Compared with the prior art, its advantages are as follows: by designing the reinforcement of the reinforcing cage, the design and reinforcement of the hoisting points, and the design of the hoisting equipment, and finally by controlling the process of hoisting the reinforcing cage, it makes full use of structural mechanics knowledge and leverages the stress characteristics of the members, thus realizing the overall hoisting of the reinforcing cage of the Y-shaped vase-shaped pier of an urban rail viaduct, and making up for the shortcomings of existing structural construction operations. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0025] Figure 1 This is a schematic diagram showing the completed steel cage fabrication.

[0026] Figure 2 This is a schematic diagram of the end bars of the steel cage after they have been bent.

[0027] Figure 3 This is a schematic diagram of a steel cage reinforcement system;

[0028] Figure 4 This is a schematic diagram of the lifting gear components;

[0029] Figure 5 This is a diagram showing the steel reinforcement cage being hoisted horizontally to the site;

[0030] Figure 6 This is a schematic diagram of the vertical rotation of the steel cage;

[0031] Figure 7 This is a schematic diagram after the steel cage has been vertically rotated.

[0032] The components include: 1. Reinforcing cage; 2. End reinforcement; 3. Horizontal reinforcement; 4. Diagonal reinforcement; 5. Crane hook; 6. Crane hook; 7. Lifting device body; 8. Lifting lug; 9. Upper lifting rope; 10. Lower lifting rope; 11. Positioning block; 12. Conical positioning hole; 13. Through hole; 14. Auxiliary reinforcing rope. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0037] In addition, the term "multiple" should mean two or more.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] like Figures 1-7 As shown, a method for the integral hoisting and installation of the reinforcing cage 1 of a Y-shaped vase-shaped pier for an urban rail viaduct includes the following steps:

[0040] S1. Fabricate steel cage 1 at the steel yard according to the design drawings. Either tie it as a whole or disassemble it into sections. Transport each section to the site and then assemble them. After steel cage 1 is fabricated, it should look like... Figure 1 As shown;

[0041] S2. Reinforcement of steel cage 1: Diagonal reinforcement bars 4 with a diameter greater than or equal to the main reinforcement bar diameter of the pier column are welded to the inner sides of the four sides of steel cage 1 and spot-welded to the main reinforcement bar. The diagonal reinforcement bars 4 are arranged crosswise inside steel cage 1.

[0042] S3. Lifting point design and reinforcement: Four lifting points are set at the top of the steel cage 1, and two lifting points are set at each "Y" opening. The number of stirrups at the lifting points is increased and spot welded to the main reinforcement.

[0043] S4, lifting of steel cage 1, such as Figure 5 As shown; the steel cage 1 is first transported off-site and parked outside the road fence, occupying one lane. A temporary side gate is opened. The steel cage 1 is transferred to the site first after unloading. After the steel cage 1 is lifted, the transport vehicle drives away immediately. The time between the arrival of the steel cage 1 and the completion of unloading is no more than 30 minutes. The construction fence is closed in time. The steel cage 1 is transferred to the site first through unloading. When unloading the steel cage 1, a trial lift is first carried out. The trial lift height is ≤20cm from the bottom plate of the truck bed. The wire rope, shackles and crane performance are checked. After ensuring safety, the lifting is carried out. The lifting during the unloading process adopts the method of lifting and placing the steel cage 1 horizontally with uniform force at 4 points. Before the steel cage 1 is unloaded, a wooden board is placed at the bottom to prevent collision.

[0044] like Figure 6 As shown, the reinforcing cage 1 is then vertically rotated. After unloading, the crane hook 5 is connected to the lifting assembly via a wire rope. The lifting assembly is then connected to the top lifting point of the reinforcing cage 1 via a wire rope. The crane hook 5 is attached to the lifting ring at the top of the pier, and the crane hook 6 is attached to the main reinforcement at 1 / 3 of the pier height. The crane hooks 5 and 6 are simultaneously lifted to approximately 5 meters. Figure 7 As shown, the crane hook 5 is slowly raised to lift the steel cage, and the crane hook 6 is slowly lowered until the steel cage 1 is flipped to a vertical position. The crane hook 6 is then removed, and the crane hook 5 is slowly rotated to the designed position of the pier column and slowly lowered until the designed elevation is reached.

[0045] S5. Before the steel cage 1 is transported to the pier, the surveyors lay out the outline of the pier column on the bottom of the pier cap and mark it with red paint. When the steel cage 1 is lowered, the bottom of the anchor steel bar that extends into the pier cap is aligned with the outline of the pier column after deducting the protective layer. The workers hang a plumb line on the top of the pier cap to check the verticality of the steel cage 1. After adjustment, it is welded to the pier cap erected steel bar.

[0046] S6. Fixing the reinforcing cage 1 specifically includes pre-welding the support reinforcement to the bottom of the foundation, welding the support reinforcement to the bottom reinforcement of the foundation, welding the main reinforcement of the pier column to the support reinforcement, and lap welding the connection between the main reinforcement of the pier column and the support reinforcement. The lap welding length is ≥10d. The pier column reinforcing cage 1 is fixed by four guy ropes in a cross shape. The angle between the guy ropes and the vertical line is controlled between 45° and 60°. One end of the guy rope is hung on the main reinforcement of the reinforcing cage 1 with a round steel hook, and the other end is fixed to the ground anchor block with a hand-operated hoist to ensure that the reinforcing cage 1 is firmly fixed and does not tilt or shift during the pouring of the foundation concrete.

[0047] The reinforcement of the steel cage 1 also includes bending the end bars 2 at the top opening of the irregularly shaped pier column inward, such as... Figure 2As shown, to reduce the lateral width of the pier column and facilitate off-site transportation of the steel cage 1, the main hook lifting points are arranged in the stirrup area below the bending point, and the horizontal spacing of the main hook lifting points is consistent with the length of the lifting tool; two horizontal reinforcing bars 3 are set at the lifting points, and the horizontal reinforcing bars 3 are spot welded to the main reinforcing bars of the pier column.

[0048] Preferably, between steps S3 and S4, a crane is also used for support. The unloading of the steel cage 1 is carried out by a 75t truck crane. 0.5×0.5m steel plates or sleepers are placed under the crane outriggers to ensure that the foundation under the outriggers is stable. The distance between the crane outriggers and the edge of the pit is not less than 1.5m to prevent the slope of the pit from becoming unstable due to stress.

[0049] like Figure 4 As shown, the lifting device assembly includes a lifting device body 7, two lifting lugs 8 fixedly disposed on the lifting device body 7, an upper lifting rope 9 fixedly connected to the upper end of each lifting lug 8, and a lower lifting rope 10 fixedly connected to the lower end of each lifting lug 8. A positioning structure is provided between the lower lifting rope 10 and the lifting device body 7. The positioning structure includes a plurality of conical positioning holes 12 opened at the bottom of the lifting device body 7 along its length direction, and a positioning block 11 fixedly disposed on the lower lifting rope 10. A through hole 13 is opened on the bottom surface of the lifting lug 8. The positioning block 11 includes a first conical part and a second conical part. The first conical part cooperates with the conical positioning hole 12. The maximum size of the second conical part is larger than the size of the through hole 13. The lower lifting rope 10 passes through the through hole 13.

[0050] Preferably, the conical positioning hole 12 is a conical hole, and both the first conical part and the second conical part are frustum structures.

[0051] To ensure strength, the lifting device body 7 is welded from two spreader beams, using fully welded I-beams of not less than double-jointed I18 as spreader beams. The type and load-bearing performance of the I-beams must fully meet the relevant national and industry steel structure specifications. The length of the lifting device body is consistent with the horizontal spacing between the top lifting points of the Y-shaped pier column reinforcement cage 1, generally 1.8 to 2.0 m. In addition, preferably, the upper lifting rope 9 and the lower lifting rope 10 are both steel wire ropes. The upper lifting rope 9 has two ropes, both connected to the hook, and the lower lifting rope 10 has four ropes, which are fixedly connected in pairs to the corresponding positioning blocks 11.

[0052] To ensure strength and stability, the lifting lug 8 includes a supporting base plate and supporting side plates fixedly installed on both sides of the supporting base plate. The through hole 13 is opened on the supporting base plate. Round steel with a diameter of not less than φ28 is welded and fixed to both sides of the supporting base plate and the supporting side plates on both sides. The sides of the round steel are fully welded to the supporting side plates and the supporting base plate. The same type of segmented steel bars are used for back welding to ensure that the round steel and the lifting lug 8 are connected as a whole. The spacing of the lifting lug 8 is adjusted appropriately according to the length of the wire rope at the upper lifting point, generally about 50cm from the end of the lifting device body, to ensure that the angle between the upper lifting rope 9 and the lifting device body 7 is 45°-60° when the upper lifting rope 9 is taut. Each lower lifting rope 10 is also fixedly connected to the lifting lug 8 with an auxiliary reinforcing rope 14. The connection method between the auxiliary reinforcing rope 14 and the lifting lug 8 can be a conventional connection method. The multi-point connection provides stronger stability and a higher safety factor.

[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for the integral hoisting of the reinforcing cage of a Y-shaped vase-shaped pier in an urban rail viaduct, characterized in that, Includes the following steps: S1. Fabricate steel cages at the steel yard according to the design drawings, either as a whole or in sections, and then transport each section to the site for splicing. S2. Reinforcing steel cage: Diagonal reinforcing bars with a diameter greater than or equal to the main reinforcement bar diameter of the pier column are welded to the inner sides of the four sides of the reinforcing cage and spot-welded to the main reinforcement bar. The diagonal reinforcing bars are arranged crosswise inside the reinforcing cage. S3. Lifting point design and reinforcement: Four lifting points are set at the top of the steel cage, and two lifting points are set at each "Y" opening. The number of stirrups at the lifting points is increased and spot welded to the main reinforcement. S4. Lifting of steel cages: The steel cages are first transported off-site and then transferred to the site by unloading. When unloading the steel cages, a trial lift is first performed. The trial lift height is ≤20cm from the bottom of the truck bed. The wire ropes, shackles and crane performance are checked. Lifting is carried out after ensuring safety. The lifting during the unloading process adopts the method of lifting and placing the steel cages horizontally with uniform force at 4 points. Before unloading the steel cages, wooden boards are placed at the bottom to prevent them from being bumped. Afterwards, the steel cage is rotated vertically. After unloading, the crane hook is connected to the lifting equipment assembly via a wire rope. The lifting equipment assembly is then connected to the lifting point at the top of the steel cage via a wire rope. The crane hook wire rope is hung at the lifting ring at the top of the pier, and the crane hook wire rope is hung on the main reinforcement at 1 / 3 of the height of the pier column. The crane hooks are lifted to 5m at the same time. The crane hook is slowly raised and lifted, while the crane hook is slowly lowered until the steel cage is flipped to a vertical position. The crane hook is then removed, and the crane hook is slowly rotated to the designed position of the pier column and slowly lowered until the designed elevation is reached. S5. Before the steel cage is transported to the pier, the surveyors lay out the outline of the pier column on the bottom of the pier cap and mark it with red paint. When the steel cage is lowered, the bottom of the anchor steel bar that extends into the pier cap is aligned with the outline of the pier column after deducting the protective layer. The workers hang a plumb line on the top of the pier cap to check the verticality of the steel cage. After adjustment, it is welded to the steel bar erected on the pier cap. S6. Fixing the reinforcing cage; Step S2 further includes bending the end reinforcement at the top opening of the irregular pier column inward, arranging the main hook lifting points in the stirrup area below the bending point, the horizontal spacing of the main hook lifting points being consistent with the length of the lifting tool; and setting two horizontal reinforcing bars at the lifting points, the horizontal reinforcing bars being spot welded to the main reinforcement of the pier column. Between steps S3 and S4, crane support is also included. The steel cage is unloaded by a 75t truck crane with a horizontal lifting mechanism. The crane outriggers are supported by 0.5×0.5m steel plates or sleepers, and the distance between the crane outriggers and the edge of the pit is not less than 1.5m. The lifting device assembly includes a lifting device body, two lifting lugs fixedly mounted on the lifting device body, an upper lifting rope fixedly connected to the upper end of each lifting lug, and a lower lifting rope fixedly connected to the lower end of each lifting lug. A positioning structure is provided between the lower lifting rope and the lifting device body. The positioning structure includes several conical positioning holes formed along the length direction of the lifting device body at its bottom, and a positioning block fixedly mounted on the lower lifting rope. A through hole is formed on the bottom surface of each lifting lug. The positioning block includes a first conical part and a second conical part. The first conical part cooperates with the conical positioning hole. The maximum size of the second conical part is larger than the size of the through hole. The lower lifting rope passes through the through hole.

2. The method for integral hoisting of the reinforcing cage of the Y-shaped vase-shaped pier of an urban rail viaduct as described in claim 1, characterized in that: Step S6 includes pre-welding the support reinforcement bars at the bottom of the pier cap, welding the support reinforcement bars to the bottom reinforcement bars of the pier cap, welding the main reinforcement bars of the pier column to the support reinforcement bars, lap welding length ≥10d, and fixing the pier column reinforcement cage with 4 guy ropes in a cross shape, with the angle between the guy ropes and the vertical line controlled at 45-60°.

3. The method for integral hoisting of the reinforcing cage of the Y-shaped vase-shaped pier of an urban rail viaduct as described in claim 2, characterized in that: One end of the guy rope is attached to the main reinforcement bar of the steel cage using a round steel hook, and the other end is fixed to the ground anchor block using a hand-operated hoist, ensuring that the steel cage is firmly fixed and does not tilt or shift during the pouring of the foundation concrete.

4. The method for integral hoisting of the reinforcing cage of the Y-shaped vase-shaped pier of an urban rail viaduct as described in claim 1, characterized in that: The conical positioning hole is a conical hole, and both the first conical part and the second conical part are frustum structures.

5. The method for integral hoisting of the reinforcing cage of the Y-shaped vase-shaped pier of an urban rail viaduct as described in claim 4, characterized in that: The lifting device body is welded from two spreader beams. The upper and lower lifting ropes are both steel wire ropes. The upper lifting rope has two ropes, both of which are connected to the hook. The lower lifting rope has four ropes, which are fixedly connected to the corresponding positioning blocks in pairs.

6. The method for integral hoisting of the reinforcing cage of the Y-shaped vase-shaped pier of an urban rail viaduct as described in claim 4, characterized in that: The lifting lug includes a supporting base plate and supporting side plates fixedly disposed on both sides of the supporting base plate. The through hole is opened on the supporting base plate, and round steel is welded and fixed to both sides of the supporting base plate and the two supporting side plates.

7. The method for integral hoisting of the reinforcing cage of a Y-shaped vase-shaped pier for an urban rail viaduct as described in claim 4, characterized in that: Each of the lowering ropes is also fixedly connected to the lifting lug with an auxiliary reinforcing rope.

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