Construction method for block prefabrication of curve variable cross-section bridge tower steel reinforcement framework

Abstract

The invention discloses a construction method for block prefabrication of a curved variable-cross-section bridge tower reinforcement framework, which comprises the following steps of: forming an integrated construction platform by an operating system, a reinforcement framework supporting system and a reinforcement positioning system, binding a reinforcement framework and a stiff framework on the integrated construction platform in advance, and reserving a scattered splicing section; main reinforcements are pre-bent on the ground through a specific instrument, the design curvature of the tower column is accurately matched, variable-curvature construction of the section of the tower column is completed, a main reinforcement positioning jig frame and a horizontal reinforcement positioning toothed plate are used for completing positioning of reinforcing steel bars, the reinforcing steel bars and a stiff framework are bound into a whole, integral hoisting is achieved, the construction complexity is reduced, and the construction efficiency is improved. And the hoisted main reinforcement has the design curvature of the tower column, so that the complicated high-altitude operation is avoided, and the construction safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering construction, and in particular to a construction method for prefabricating a steel frame of a curved variable-section bridge tower in blocks. Background Art

[0002] As a cable system, cable-stayed bridges have a greater span capacity than beam bridges and are the main type of long-span bridges. Bridge towers are the key load-bearing structures of cable-stayed bridges. The main types of bridge towers are diamond-shaped, A-shaped, inverted Y-shaped, H-shaped, and single-column types. The commonly used material is reinforced concrete. Most tower columns are in the form of tower limbs on both sides tilted inward at a certain angle. Among them, for example, the diamond-shaped tower column, the tower limbs on both sides not only have an inward tilt angle, but the slope of the tower limb inclination angle is also constantly changing.

[0003] At present, there are two main ways to construct existing tower columns:

[0004] (1) On-site assembly: transport the required steel bars to the site and assemble them in sequence.

[0005] (2) Mesh assembly: First, assemble the steel bars into mesh or blocks on the ground, and then hoist them to the designated location for assembly.

[0006] The construction efficiency of the above two construction methods is not high enough, and there are safety risks in high-altitude operations. Compared with the first loose splicing method, the second construction method improves the efficiency of construction to a certain extent and reduces safety risks by processing the steel bars into meshes in advance on the ground, but the degree of improvement is limited. Especially for the towers of curved variable-section cable-stayed bridges, construction work at high altitudes not only poses safety risks to the operators, but also has great construction difficulties, is difficult to control the line shape of the towers, and cannot guarantee the construction quality. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a construction method for prefabricating the steel frame of a curved variable-section bridge tower in blocks, which solves the problems of low construction efficiency, high safety risks and difficult control of curve curvature accuracy of curved variable-section bridge towers.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A construction method for prefabricating a steel frame of a curved variable-section bridge tower in blocks, characterized by comprising the following steps:

[0010] S1. According to the design of the construction drawings, an integrated construction platform is built at the corresponding position, binding is performed inside the integrated construction platform, and loose sections are reserved. The integrated construction platform includes an operating system, a steel skeleton support system, and a steel positioning system;

[0011] S2. After the operating system, the steel skeleton support system and the steel positioning system are completed, a cantilever plate is installed in the operating system. The cantilever plate can move horizontally in the operating system. The cantilever distance of the cantilever plate is controlled by horizontal movement, thereby controlling the distance between the binding operation point and the steel skeleton and the rigid skeleton;

[0012] S3. Use equipment to pre-bend the main reinforcement, accurately position it through the reinforcement positioning system, then tie the first layer of vertical main reinforcement and the first layer of horizontal reinforcement on the reinforcement skeleton support system, and store the second layer of horizontal reinforcement on the reinforcement positioning system;

[0013] S4, then tie the second layer of vertical main reinforcement and the second layer of horizontal reinforcement;

[0014] S5. Then install the rigid frame, which is connected with the main reinforcement into a whole;

[0015] S6. Then install the connector and main reinforcement positioning tooth plate on the rigid frame;

[0016] S7, tying the remaining steel bars, thereby completing the tying and manufacturing of the component one and the component two;

[0017] S8. Move the cantilever plate, move the extended part of the cantilever plate into the operating system, and move the operating system so that the operating system is away from component 1 and component 2 to form a hoisting space, and then hoist component 1 and component 2 in sequence.

[0018] Furthermore, the operating system includes a lashing platform and a platform slideway, the platform slideway is fixed on the ground, and the lashing platform is installed on the platform slideway and can move along the platform slideway.

[0019] Furthermore, the lashing platform adopts a light frame structure, the lashing platform is provided with multiple layers, a protective railing is installed on the outer side of the top layer of the lashing platform, and each layer of the lashing platform is installed with a horizontally movable cantilever plate.

[0020] Furthermore, each layer of the lashing platform is provided with a movable slideway, and the cantilever plate is installed on the movable slideway through rollers to achieve horizontal movement of the cantilever plate.

[0021] Further, in step S8, after the binding of parts one and two is completed, the cantilever plate is first moved horizontally to the binding platform, and then the binding platform is moved along the platform slide so that the binding platform drives the cantilever plate away from parts one and two to form a hoisting space sufficient for hoisting, and a hoisting device is installed in the hoisting space, and parts one and two are hoisted in sequence by the hoisting device.

[0022] Furthermore, in step S2, when the cantilever plate moves horizontally, the length extending from the lashing platform is 50 to 1500 mm.

[0023] Furthermore, the steel skeleton support system includes a support beam, a telescopic sleeve and a support embedded part. The support embedded part is fixed on the ground. The support beam is hinged to a support embedded part. One end of the telescopic sleeve is hinged to another support embedded part. The other end of the telescopic sleeve is hinged to the support beam. The inclination angle of the support beam is controlled by the telescopic sleeve.

[0024] Furthermore, the steel bar positioning system includes a bottom main bar positioning frame, a middle main bar positioning frame, a top main bar positioning frame and a horizontal bar positioning tooth plate. The bottom main bar positioning frame is fixed on the ground, the middle main bar positioning frame and the top main bar positioning frame are fixedly installed on the rigid frame, and the horizontal bar positioning tooth plate is installed on the steel bar frame support system and the rigid frame. The steel bar positioning system can accurately locate the positions of the main bars and horizontal bars.

[0025] Furthermore, in step S5, before installing the rigid frame, it is necessary to first remove the horizontal rib positioning tooth plate, and then install the rigid frame.

[0026] Furthermore, the steel frame and the rigid frame both include a standard section and a widened overlapping section, and the standard section and the widened overlapping section are connected to form the steel frame or the rigid frame.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, an integrated construction platform is formed by an operating system, a steel frame support system and a steel positioning system. The steel frame and the rigid frame are tied in advance on the integrated construction platform, and loose sections are reserved. The main reinforcement is pre-bent on the ground by a specific device to accurately match the design curvature of the tower column, and the variable curvature construction of the tower column section is completed, so that the hoisted main reinforcement already has the design curvature of the tower column, avoiding complicated high-altitude operation and improving construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] Figure 1 It is a structural schematic diagram of the integrated construction platform in the present invention;

[0031] Figure 2 For the present invention Figure 1 A top view of

[0032] Figure 3 It is a structural schematic diagram of the main reinforcement positioning tooth plate in the present invention;

[0033] Figure 4 It is a structural schematic diagram of the steel reinforcement skeleton in the present invention;

[0034] Figure 5 This is the construction flow chart (I) of the present invention;

[0035] Figure 6 This is the construction flow chart (II) of the present invention;

[0036] Figure 7 It is the construction flow chart (III) in the present invention;

[0037] Figure 8 This is the construction flow chart (IV) of the present invention;

[0038] Fig. 9 It is the construction flow chart (V) in the present invention;

[0039] Fig.10 It is the construction flow chart (six) in the present invention;

[0040] Fig.11 This is the construction flow chart (VII) of the present invention;

[0041] Fig.12 This is the construction flow chart (eight) of the present invention.

[0042] In the figure: 1-reinforcement skeleton; 2-rigid skeleton; 3-standard section; 4-variable width overlap section; 5-binding platform; 6-platform slide; 7-guardrail; 8-cantilever plate; 9-movable slide; 10-roller; 11-support beam; 12-telescopic sleeve; 13-support embedded parts; 14-bottom main reinforcement positioning frame; 15-horizontal reinforcement positioning tooth plate; 16-first layer vertical main reinforcement; 17-first layer horizontal reinforcement; 18-second layer vertical main reinforcement; 19-second layer horizontal reinforcement; 20-connector; 21-main reinforcement positioning tooth plate; 22-hoisting device; a-component one; b-component two. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] like Figures 1 to 4 As shown, the bridge tower is in an arc shape as a whole, and the slope of the steel frame of the bridge tower in the entire section is constantly changing. The steel frame is formed by tying steel bars to a rigid frame. Both the steel frame and the rigid frame include four inclined L-shaped standard sections and variable width lap sections. The standard sections and variable width lap sections are connected in pairs to form a steel frame or a rigid frame. The sections of the four inclined L-shaped standard sections are the four corners of the bridge tower section where the steel bars are fixed. Together with the variable width lap sections, they can adapt to the prefabrication of the steel frame of the entire bridge tower.

[0045] The present invention can flexibly control the splicing of tower column details by combining components with loose splicing, can control the staggering of components and steel anchor beams, and can accurately install steel anchors by loose splicing.

[0046] The integrated construction platform includes an operating system, a steel skeleton support system and a steel bar positioning system. The operating system is convenient for operators to operate, and the steel bars are tied to the rigid skeleton to form components. The steel skeleton support system supports the steel bars, and the steel skeleton support system can adjust the inclination angle to complete the production of rods with different curvatures. The steel bar positioning system can accurately locate the main bars and horizontal bars of the steel skeleton, thereby reducing the docking errors between sections or the same section of the steel skeleton.

[0047] The operating system includes a tying platform and a platform slide. The platform slide is fixed on the ground. The tying platform is installed on the platform slide and can move along the platform slide. The platform slide can be composed of an I-beam, a traction end, and a fine-rolled threaded steel bar. The I-beam is fixed on the ground, the traction end is installed at both ends of the I-beam, and the fine-rolled threaded steel bar is installed between the two traction ends. The tying platform adopts a light skeleton structure. The entire tying platform is 5.7m high. The tying platform is provided with multiple layers. In this embodiment, a total of four layers are provided. A protective railing is installed on the outer side of the top layer of the tying platform. The tying platform is installed on the platform slide. The position of the tying platform on the platform slide is accurately adjusted and locked by the fine-rolled threaded steel bar cap. Each layer of the tying platform is installed with a horizontally movable cantilever plate. Each layer of the tying platform is provided with a movable slide. The cantilever plate is installed on the movable slide through rollers to realize the horizontal movement of the cantilever plate. According to the construction progress of the main tower, the position of the tying platform and the cantilever plate can be flexibly controlled to facilitate construction.

[0048] The steel skeleton support system includes a support beam, a telescopic sleeve and a support embedded part. The support embedded part is fixed on the ground. There are two support embedded parts. The support beam is hinged to one of the support embedded parts. One end of the telescopic sleeve is hinged to the other support embedded part. The other end of the telescopic sleeve is hinged to the support beam. The inclination angle of the support beam is controlled by the telescopic sleeve to achieve installation at different inclination angles.

[0049] The present invention completes the production of four inclined L-shaped standard sections and a widened overlap section on a steel skeleton support system, uses a hoisting device to hoist component one and component two to a specified position, and completes the splicing of the four inclined L-shaped standard sections through loose splicing sections. The reserved loose splicing sections facilitate the installation of the widened overlap section, that is, after the assembly is completed, the widened overlap section is located in the loose splicing section, so that each component is connected into a whole, each layer of components is molded and cast layer by layer, and the upper and lower components are connected mechanically to complete the construction of a curved variable-section tower column.

[0050] The steel bar positioning system includes a bottom main bar positioning frame, a middle main bar positioning frame, a top main bar positioning frame and a horizontal bar positioning tooth plate. The bottom main bar positioning frame is fixed on the ground, the middle main bar positioning frame and the top main bar positioning frame are fixedly installed on the rigid frame, and the horizontal bar positioning tooth plate is installed on the steel bar frame support system and the rigid frame. The steel bar positioning system can accurately locate the positions of the main bars and horizontal bars.

[0051] In this embodiment, the bottom main reinforcement positioning frame adopts a channel steel arranged at the position of the inner and outer main reinforcements. The channel steel is anchored to the ground through embedded anchor plates and anchor bars. The channel steels are connected to form a whole. Then, a positioning sleeve is cut to a length of 1 cm and welded to the upper surface of the channel steel according to the main reinforcement spacing. The steel bar sleeve is arranged strictly according to the main reinforcement position to ensure that the steel bar is accurately positioned and does not shift.

[0052] like Figures 5 to 12 As shown, a construction method for prefabricating a steel frame of a curved variable-section bridge tower in blocks comprises the following steps:

[0053] S1. According to the design of the construction drawings, build an integrated construction platform at the corresponding position, tie it up inside the integrated construction platform, and reserve loose sections;

[0054] S2. After the construction of the operating system, the steel skeleton support system and the steel positioning system is completed, a cantilever plate is installed in the operating system. The cantilever plate can move horizontally in the operating system. The cantilever distance of the cantilever plate is controlled by horizontal movement, thereby controlling the distance between the binding operation point and the steel skeleton and the rigid skeleton, which is convenient for workers to complete the binding construction. When the cantilever plate moves horizontally, the length of the cantilever plate extending out of the binding platform is 50 to 1500 mm;

[0055] S3. Use equipment to pre-bend the main reinforcement, accurately position it through the positioning frame of the reinforcement positioning system, and then tie the first layer of vertical main reinforcement and the first layer of horizontal reinforcement on the support beam of the reinforcement skeleton support system, and store the second layer of horizontal reinforcement on the horizontal reinforcement positioning tooth plate of the reinforcement positioning system;

[0056] S4, then tie the second layer of vertical main reinforcement and the second layer of horizontal reinforcement;

[0057] S5. Then take out the horizontal reinforcement positioning tooth plate, install the rigid frame, and connect the rigid frame and the main reinforcement into a whole;

[0058] S6. Then install the connector and main reinforcement positioning tooth plate on the rigid frame;

[0059] S7, tying the remaining steel bars, thereby completing the tying and manufacturing of the component one and the component two;

[0060] S8. After the binding of Part 1 and Part 2 is completed, first move the cantilever plate, move the protruding part of the cantilever plate into the binding platform of the operating system, then move the operating system, move the binding platform along the platform slide, so that the binding platform drives the cantilever plate away from Part 1 and Part 2, forming a hoisting space sufficient for hoisting, and then install the hoisting device in the hoisting space, and use the hoisting device to hoist Part 1 and Part 2 in turn.

[0061] In the present invention, an integrated construction platform is formed by an operating system, a steel frame support system and a steel positioning system. The steel frame and the rigid frame are tied in advance on the integrated construction platform, and loose sections are reserved. The main reinforcement is pre-bent on the ground by a specific device to accurately match the design curvature of the tower column, and the variable curvature construction of the tower column section is completed, so that the hoisted main reinforcement already has the design curvature of the tower column, avoiding complicated high-altitude operation and improving construction safety.

[0062] The main reinforcement of the curved part of the bridge tower column in the present invention needs to be pre-bent by a machine on the ground to accurately match the designed curvature of the tower column and complete the construction of the variable curvature of the tower column section. The main reinforcement positioning frame and the horizontal reinforcement positioning tooth plate are used to complete the positioning of the reinforcement, which is tied into a whole with the rigid frame and hoisted as a whole, reducing the complexity of construction.

[0063] The implementation methods of the present invention are not limited to these. According to the above-mentioned embodiments of the present invention, by using conventional technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the present invention and without conflict, the above-mentioned preferred embodiments may also be modified, replaced or combined in various other forms, and the other embodiments obtained all fall within the scope of protection of the present invention.

Claims

1. A construction method for prefabricating the steel frame of a curved variable-section bridge tower in blocks, characterized in that The following steps are involved: S1. According to the design of the construction drawings, an integrated construction platform is built at the corresponding position, binding is performed inside the integrated construction platform, and loose sections are reserved. The integrated construction platform includes an operating system, a steel skeleton support system, and a steel positioning system; S2. After the operating system, the steel skeleton support system and the steel positioning system are completed, a cantilever plate is installed in the operating system. The cantilever plate can move horizontally in the operating system. The cantilever distance of the cantilever plate is controlled by horizontal movement, thereby controlling the distance between the binding operation point and the steel skeleton and the rigid skeleton; S3. Use equipment to pre-bend the main reinforcement, accurately position it through the reinforcement positioning system, then tie the first layer of vertical main reinforcement and the first layer of horizontal reinforcement on the reinforcement skeleton support system, and store the second layer of horizontal reinforcement on the reinforcement positioning system; S4, then tie the second layer of vertical main reinforcement and the second layer of horizontal reinforcement; S5. Then install the rigid frame, which is connected with the main reinforcement into a whole; S6. Then install the connector and main reinforcement positioning tooth plate on the rigid frame; S7, tying the remaining steel bars, thereby completing the tying and manufacturing of the component one and the component two; S8. Move the cantilever plate, move the extended part of the cantilever plate into the operating system, and move the operating system so that the operating system is away from component 1 and component 2 to form a hoisting space, and then hoist component 1 and component 2 in sequence.

2. The method for prefabricating the steel frame of a curved variable-section bridge tower in blocks according to claim 1 is characterized by: The operating system comprises a lashing platform and a platform slideway, wherein the platform slideway is fixed on the ground, and the lashing platform is installed on the platform slideway and can move along the platform slideway.

3. The construction method for prefabricating the steel frame of a curved variable-section bridge tower in blocks according to claim 2 is characterized by: The lashing platform adopts a light frame structure and is provided with multiple layers. A protective railing is installed on the outer side of the top layer of the lashing platform, and each layer of the lashing platform is installed with the cantilever plate that can move horizontally.

4. The method for prefabricating the steel frame of a curved variable-section bridge tower in blocks according to claim 3 is characterized by: Each layer of the lashing platform is provided with a movable slideway, and the cantilever plate is installed on the movable slideway via rollers to achieve horizontal movement of the cantilever plate.

5. The method for prefabricating the steel frame of a curved variable-section bridge tower in blocks according to claim 4 is characterized in that: In step S8, after the binding of parts one and two is completed, the cantilever plate is first moved horizontally to the binding platform, and then the binding platform is moved along the platform slide so that the binding platform drives the cantilever plate away from parts one and two to form a hoisting space sufficient for hoisting. A hoisting device is installed in the hoisting space, and parts one and two are hoisted in sequence by the hoisting device.

6. The construction method for prefabricating the steel frame of a curved variable-section bridge tower in blocks according to claim 2 is characterized by: In step S2, when the cantilever plate moves horizontally, the length extending from the lashing platform is 50 to 1500 mm.

7. The method for prefabricating the steel frame of a curved variable-section bridge tower in blocks according to claim 1 is characterized in that: The steel skeleton support system includes a support beam, a telescopic sleeve and a support embedded part. The support embedded part is fixed on the ground. The support beam is hinged to one of the support embedded parts. One end of the telescopic sleeve is hinged to another of the support embedded parts. The other end of the telescopic sleeve is hinged to the support beam. The inclination angle of the support beam is controlled by the telescopic sleeve.

8. The method for prefabricating the steel frame of a curved variable cross-section bridge tower in blocks according to claim 1 is characterized by: The steel bar positioning system includes a bottom main bar positioning frame, a middle main bar positioning frame, a top main bar positioning frame and a horizontal bar positioning tooth plate. The bottom main bar positioning frame is fixed on the ground, the middle main bar positioning frame and the top main bar positioning frame are fixedly installed on the rigid frame, and the horizontal bar positioning tooth plate is installed on the steel bar frame support system and the rigid frame. The steel bar positioning system can accurately locate the positions of the main bars and horizontal bars.

9. The method for prefabricating the steel frame of a curved variable cross-section bridge tower in blocks according to claim 8, characterized in that: In step S5, before installing the rigid frame, it is necessary to first remove the horizontal rib positioning tooth plate, and then install the rigid frame.

10. The method for prefabricating the steel frame of a curved variable-section bridge tower in blocks according to claim 1, characterized in that: The steel reinforcement skeleton and the rigid skeleton both include a standard section and a widened overlapping section, and the standard section and the widened overlapping section are connected to form the steel reinforcement skeleton or the rigid skeleton.

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