Box girder steel strand threading construction platform

Abstract

The utility model discloses a kind of box girder steel strand's threading construction platform, it is related to bridge construction technical field.The platform includes steel frame, lifting platform, translation plate and pulley block.Steel frame is hollow frame, its both sides are equipped with hook, with trapezoidal section.The lifting platform is hung on hook by the hook block of its bottom, can be along Z direction lifting and be constrained X, Y direction movement.Two threaded steels are erected on lifting platform, translation plate is sleeved on threaded steel by the sliding sleeve of its bottom, can drive threading machine to slide along Y direction.Pulley block is hoisted on the sliding beam of the top of steel frame by sliding block, can slide in Y direction and provide lifting power for lifting platform.The utility model controls lifting by pulley block, realizes transverse movement by translation plate, structure is stable, easy to operate, effectively solve the positioning difficulty in existing threading construction, low efficiency and poor safety problem, realize the accurate, efficient, safe positioning of threading machine in three-dimensional space.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, specifically to a construction platform for threading steel strands in box girders. Background Technology

[0002] In the construction of prestressed concrete box girders, threading the steel strands into the pre-embedded ducts (strand threading) is a crucial step. Currently, common construction methods mainly suffer from the following problems: 1. Manual pushing is inefficient and unsafe: For shorter steel strands, manual direct threading is often used. This method is labor-intensive, inefficient, and poses safety risks for personnel working in the confined space inside the box girder. For longer and heavier steel strand bundles, manual operation is almost impossible.

[0003] 2. Difficulty in positioning with simple mechanical assistance: Some construction sites use simple gantry cranes or forklifts in conjunction with winches for cable threading. However, such devices have significant drawbacks: Poor positioning accuracy: It is difficult to fine-tune the threading machine and cannot accurately align with the pre-embedded holes at different heights and lateral positions on the beam. A lot of manual assistance in pulling and correcting is required, which is time-consuming and labor-intensive.

[0004] Insufficient stability: The simple support has poor rigidity and is prone to shaking when the threading machine is working, which affects the threading accuracy and may even pose a risk of overturning.

[0005] Low level of automation: Lifting and lateral movement often rely on external mechanical equipment or are entirely manual, making operation cumbersome and collaborative work difficult.

[0006] 3. Large-scale specialized equipment is costly and inconvenient to move: Although some large-scale automated cable-laying equipment exists, its procurement and maintenance costs are high, its structure is complex, and it is inconvenient to move and set up on the construction site, making it difficult to apply flexibly between small and medium-sized projects or multiple work sites.

[0007] Therefore, there is an urgent need for a cost-effective, flexible, precise, and safe wire-threading construction platform to solve the problems of low efficiency, significant safety hazards, and difficulty in positioning and adjustment in existing technologies. Summary of the Invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a construction platform for threading steel strands in box girders, which is compact in structure, easy to operate, and capable of achieving precise alignment and stable support for the threading machine.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A construction platform for threading steel strands in a box girder, defining the threading direction of the steel strands as the X-direction, the two sides of the construction platform as the Y-direction, and the height direction as the Z-direction, is characterized by comprising a steel frame, a lifting platform, a translation plate, and a pulley block; the lifting platform is internally adjustable and supported in the Z-direction; the translation plate is slidably supported in the Y-direction and constrained in the X-direction on the lifting platform, and the threading machine is fixedly supported on the translation plate; the pulley block is slidably suspended in the Y-direction on the top of the steel frame, and the lifting power output end of the pulley block provides lifting power to the lifting platform.

[0010] Preferably, the steel frame is a hollow frame with a trapezoidal cross section, made of angle steel or square steel welded together. Hooks with open tops are fixed on both sides of the steel frame in the Y direction. The lifting platform is supported in the Z direction and constrained in the X and Y directions on the hooks.

[0011] Preferably, the lifting platform includes two lifting beams and two threaded steel bars. The two lifting beams are respectively hooked on hooks on both sides of the steel frame in the Y direction. The bottom of each of the two lifting beams is fixed with multiple hanging blocks that cooperate with the hooks to constrain the X-direction displacement of the lifting beams. The top surface of each of the two lifting beams is fixed with multiple fixed sleeves that slide in the Y direction and constrain the threaded steel bars in the X and Z directions.

[0012] Preferably, a plurality of sliding sleeves that are slidably sleeved on the outside of the threaded steel are fixed on the bottom surface of the translation plate, and the top surface of the translation plate or the top of the housing of the threading machine is hoisted and connected by the lifting power output end of the pulley block.

[0013] Preferably, a sliding beam is fixed to the top of the steel frame in the Y direction, and a slider is slidably connected to the bottom of the sliding beam in the Y direction; a pulley block is installed at the bottom of the slider.

[0014] The advantages and technical effects of this utility model are as follows: Compared with the prior art, the cable threading construction platform for box girder steel strands provided by this utility model has the following significant advantages, which correspond one by one to the problems raised in the background art: 1. To address the issues of "low efficiency and poor safety of manual pushing" and "difficulty in simple mechanical positioning," a steel frame and its hook design are used to achieve the following: The trapezoidal steel frame welded from angle steel and square steel provides extremely stable and rigid foundation support, fundamentally solving the risk of simple supports swaying and overturning, and ensuring safety during high-altitude and dynamic operations.

[0015] The hooks on both sides of the frame form a sturdy vertical guide rail, which strictly restricts the movement of the lifting platform to the Z-axis, providing it with a stable and reliable lifting path. At the same time, it bears the main reaction force and bending moment generated during the threading operation, ensuring the stability of the entire platform.

[0016] 2. To address the issues of "poor positioning accuracy and difficulty in adjustment," a collaborative design between the lifting platform and the translation plate is employed: The lifting beam achieves vertical lifting of the entire platform through the engagement of the bottom hanging blocks with the hooks of the steel frame. This structural design ensures a smooth lifting process, and the lateral engagement of the hanging blocks and hooks effectively constrains displacement in the X direction, preventing head swaying during threading.

[0017] The threaded steel bar fixed to the lifting beam serves as the sliding guide rail for the translation plate. The translation plate engages with the threaded steel bar via a sliding sleeve at its bottom, allowing the operator to easily and smoothly move the threading machine in the Y-axis (lateral direction), achieving precise alignment of the hole openings. This design transforms the movement of the cumbersome threading machine into a lightweight translation operation, solving the core pain points of inconvenient movement and difficult fine-tuning of large equipment.

[0018] 3. To address the issues of "low automation and cumbersome operation," a pulley system and its sliding installation method are used: As the core power unit, the pulley block provides stable and controllable lifting power through power sources such as winches, replacing manual handling or large mechanical assistance, significantly reducing labor intensity and improving efficiency.

[0019] The pulley block is suspended from the top sliding beam via a slider, allowing it to move synchronously with the translation plate in the Y direction. This innovative design ensures that no matter where the threading machine moves laterally, the lifting force always acts vertically on its center of gravity, avoiding jamming, wear, or safety hazards caused by eccentric pulling or oblique lifting. It achieves perfect decoupling and coordination between lifting and lateral movement, resulting in a simple and efficient operation process.

[0020] In summary, this utility model achieves integrated, modular, precise, and safe construction results through the ingenious combination and synergistic effect of four major components: steel frame, lifting platform, translation plate, and pulley system, effectively solving the problems raised in the background art. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the present invention; In the diagram: 1-steel frame; 2-sliding beam; 3-slider; 4-pulley block; 5-hook; 6-threaded steel; 7-fixed sleeve; 8-lifting beam; 9-hanging block; 10-sliding plate; 11-sliding sleeve; 12-threading machine; 13-steel strand; 14-caster. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] like Figure 1 As shown, this utility model discloses a construction platform for threading steel strands in a box girder. The threading direction of the steel strands 13 is defined as the X-direction, the two sides of the construction platform are defined as the Y-direction, and the height direction is defined as the Z-direction. It includes a steel frame 1, a lifting platform, a translation plate 10, and a pulley block 4. The lifting platform is adjusted and supported in the Z-direction inside the steel frame. The translation plate is slidable in the Y-direction and constrained in the X-direction on the lifting platform. The threading machine 12 is fixedly supported on the translation plate. The pulley block is slidably hoisted in the Y-direction on the top of the steel frame. The lifting power output end of the pulley block provides lifting power to the lifting platform.

[0024] Preferably, the steel frame is a hollow frame with a trapezoidal cross section, made of angle steel or square steel welded together. Hooks 5 with open tops are fixed on both sides of the steel frame in the Y direction. The lifting platform is supported in the Z direction and constrained in the X and Y directions on the hooks.

[0025] Preferably, the lifting platform includes two lifting beams 8 and two threaded steel bars 6. The two lifting beams are respectively hooked on hooks on both sides of the steel frame in the Y direction. The bottom of each of the two lifting beams is fixed with multiple hanging blocks 9 that cooperate with the hooks to constrain the X-direction displacement of the lifting beams. The top surface of each of the two lifting beams is fixed with multiple fixed sleeves 7 that slide in the Y direction and constrain the threaded steel bars in the X and Z directions.

[0026] Preferably, a plurality of sliding sleeves 11 are fixed on the bottom surface of the translation plate and are slidably sleeved on the outside of the threaded steel, and the top surface of the translation plate or the top of the housing of the threading machine is hoisted and connected by the lifting power output end of the pulley block.

[0027] Preferably, a sliding beam 2 is fixedly installed at the top Y direction of the steel frame, and a slider 3 is slidably hooked at the bottom Y direction of the sliding beam; a pulley block is installed at the bottom of the slider.

[0028] In addition, the threading machine of this utility model preferably adopts a mature product in the prior art; In addition, the present invention preferably has casters 14 with locking function rotatably connected to the bottom of the steel frame, thereby improving the flexibility of the overall wire threading construction platform and facilitating its movement in the construction site environment. During wire threading, the casters need to be locked to ensure the stability of the steel frame and prevent the overall wire threading construction platform from shifting in the opposite direction to the wire feeding.

[0029] In addition, in order to prevent the equipment from rusting in the field construction environment, the steel frame, lifting platform and translation plate, especially the rebar, are coated with an anti-rust coating.

[0030] The working principle of this utility model is as follows: During construction, the steel frame is first placed at a suitable position in front of the box girder duct opening. By controlling the pulley system, the threading machine is raised (Z-axis) to approximately the same height as the duct opening. Then, the machine is manually pushed gently to slide along the threaded steel (Y-axis) and precisely align with the center of the duct. Finally, the machine is started to perform the threading operation (X-axis). The entire process can be easily operated by one person, ensuring precise positioning, stability, and safety.

[0031] When it is necessary to adjust the Y-axis and Z-axis displacement of the threading machine, the pulley block (either a manual pulley block or an electric hoist) needs to be activated to provide lifting force to the threading machine. The lifting force is then transmitted to the lifting platform via the threading machine and the translation plate. It should be noted that when the lifting platform is raised or lowered, the Y-axis spacing between the two lifting beams needs to be manually adjusted to prevent them from colliding with the bottom of the hook. After the lifting beam is in place, the hanging block at the bottom of the lifting beam is engaged with the side wall of the hook, and the lifting beam body is hooked into the hook, thereby achieving the fixation of the lifting beam relative to the steel frame in the X, Y, and Z directions.

[0032] Finally, any aspects of this utility model not fully described herein utilize existing mature products and technologies.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A construction platform for threading steel strands in a box girder, defining the threading direction of the steel strands as the X-direction, the two sides of the construction platform as the Y-direction, and the height direction as the Z-direction, characterized in that: It includes a steel frame, a lifting platform, a translation plate, and a pulley block; the steel frame internally adjusts and supports the lifting platform in the Z direction; the lifting platform slides in the Y direction and constrains and supports the translation plate in the X direction, and the translation plate is fixedly supported by the threading machine; the pulley block is slidably hoisted on the top of the steel frame in the Y direction, and the lifting power output end of the pulley block provides lifting power to the lifting platform.

2. The cable threading platform for box girder steel strands according to claim 1, characterized in that: The steel frame is a hollow frame with a trapezoidal cross section, made of angle steel or square steel welded together. Hooks with open tops are fixed on both sides of the steel frame in the Y direction. The lifting platform is supported in the Z direction and constrained in the X and Y directions on the hooks.

3. The cable threading construction platform for box girder steel strands according to claim 2, characterized in that: The lifting platform includes two lifting beams and two threaded steel bars. The two lifting beams are respectively hooked on hooks on both sides of the steel frame in the Y direction. The bottom of each lifting beam is fixed with multiple hanging blocks that cooperate with the hooks to constrain the X-direction displacement of the lifting beam. The top surface of each lifting beam is fixed with multiple fixed sleeves that slide in the Y direction and constrain the threaded steel bars in the X and Z directions.

4. The cable threading platform for box girder steel strands according to claim 3, characterized in that: Multiple sliding sleeves that are slidably sleeved on the outside of the threaded steel are fixed on the bottom surface of the translation plate, and the top surface of the translation plate or the top of the housing of the threading machine is hoisted and connected by the lifting power output end of the pulley block.

5. The cable threading platform for box girder steel strands according to claim 1, characterized in that: A sliding beam is fixed to the top Y direction of the steel frame, and a slider is slidably hooked to the bottom Y direction of the sliding beam; a pulley block is installed at the bottom of the slider.

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