Bridge prestress tensioning operation platform suitable for limited space operation

Abstract

The utility model discloses bridge prestress tension operation platform suitable for limited space operation, and the platform includes pre -buried bearing beam, is provided with distribution beam on pre -buried bearing beam, and the walkway board is arranged on distribution beam, vertical outer support is connected with the outermost distribution beam, and the other end vertical outer support is connected to pre -buried connecting beam, and vertical inner support is welded with column foot steel sheet, and the column foot steel sheet is fixed with box girder roof plate through column foot bolt, and the both ends of top longitudinal beam are connected with vertical inner support and vertical outer support respectively, and top crossbeam is fixedly connected on the upper portion of top longitudinal beam, and forms the whole, and track beam is suspended and fixed in the lower portion of top longitudinal beam and is used as the support component of external hoisting tool, and the safety net is arranged in the periphery of operation platform and forms the enclosure structure. Through the height of vertical inner support and vertical outer support and the overhanging length of pre -buried bearing beam and the overhanging length of pre -buried connecting beam, the width and height of operation platform can be adjusted, thereby satisfying the prestress tension of various size box girder.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a bridge prestressing tensioning operation platform suitable for confined space operations. Background Technology

[0002] Currently, most bridge prestressed tensioning platforms use hanging baskets as carriers. Through a movable hanging basket system, they serve as aerial work platforms to achieve symmetrical cantilever casting or assembly of the main beam of the bridge. They are suitable for complex scenarios such as crossing deep valleys, rivers, and main traffic lines where it is impossible to erect scaffolding, and have become bridge types such as cable-stayed bridges and continuous rigid frame bridges.

[0003] While existing technologies offer technological advantages, their application still faces constraints imposed by spatial conditions. In space-constrained construction environments, such as densely populated urban areas, narrow valleys, or near existing buildings, the large size and mobility requirements of the hanging basket system can become critical obstacles. Hanging baskets are typically composed of heavy steel components, and their main trusses and formwork systems require sufficient lateral and longitudinal space. In confined areas, insufficient space for installation, movement, and operation can significantly reduce construction efficiency or even prevent implementation. For example, when crossing existing railways or highways, a safety clearance must be reserved below the hanging basket. However, limitations imposed by existing structures or passage height force the hanging basket design to compress vertical space, potentially sacrificing structural rigidity or requiring additional support measures, thereby increasing construction costs. Furthermore, in the construction of curved bridges or variable cross-section beam segments, the hanging basket's formwork adjustment system must frequently adapt to changes in spatial form. If the working surface is narrow, the flexibility of worker operation and machinery movement is limited, easily leading to construction errors or safety hazards. For multi-span continuous bridges, the turnover and positioning of the hanging basket in narrow spans are equally complex, requiring repeated disassembly and reassembly, further slowing down the construction period.

[0004] Existing technology discloses a formwork system for cantilever casting of continuous beams, employing a diamond-shaped formwork. It mainly consists of a load-bearing system, a suspension system, a formwork system, a bottom basket system, an anchoring system, a traveling system, and a safety protection system. This effective system combination reduces manual intervention and improves the accuracy of simultaneous construction from both ends of the continuous beam, ensuring safe construction and linear shaping of the bridge deck. However, it has two drawbacks: first, the structure is too complex, making it unsuitable for areas with limited end space, especially in areas with narrow working surfaces; second, due to its large size, it is only suitable for large bridges and cannot meet the prestressing tensioning requirements of medium and small-span bridges. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, a bridge prestressing tensioning platform suitable for confined space operations is provided. This platform features a simple structure and strong versatility. Under confined space conditions, it provides a tensioning platform that meets the needs of prestressing tensioning for various types of box girders.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A bridge prestressing tensioning operation platform suitable for confined space operations is characterized by comprising: a pre-embedded load-bearing beam structure, a pre-embedded connecting beam, a support frame, a track beam, and a walkway slab located at the end of a box girder; The embedded load-bearing beam structure is set along the width direction of the box girder. One side of the embedded load-bearing beam structure is embedded in the bottom plate of the box girder, and the other side cantilevered on the outside of the bottom plate of the box girder. Part of the walkway slab is laid on the embedded load-bearing beam structure, and the other part of the walkway slab overlaps on the bottom plate of the box girder. Several support frames are spaced apart along the width of the box girder. One side of the support frame is fixedly supported on the top surface of the box girder, and the other side of the support frame is supported on the embedded load-bearing beam structure. The middle part of the support frame spans directly above the part of the walkway slab located on the embedded load-bearing beam structure. The track beam is set along the width of the box girder and is fixedly connected to the middle of each support frame. A slide rail is provided at the bottom of the track beam, which is used to support the external suspended components. One end of the pre-embedded connecting beam is embedded in the top plate of the box girder, and the other end is fixedly connected to the support frame.

[0007] According to the above technical solution, the embedded load-bearing beam structure includes several embedded load-bearing beams arranged at intervals along the width direction of the box girder; one end of the embedded load-bearing beam is embedded in the bottom plate of the box girder, and the other end of the embedded load-bearing beam is cantilevered on the outside of the bottom plate of the box girder; one end of the support frame is fixedly supported on the cantilevered part of the embedded load-bearing beam.

[0008] According to the above technical solution, the embedded load-bearing beam structure includes several embedded load-bearing beams spaced apart along the width direction of the box girder, and distribution beams arranged along the width direction of the box girder; one end of the embedded load-bearing beam is embedded in the bottom plate of the box girder, and the other end of the embedded load-bearing beam cantilevered on the outside of the bottom plate of the box girder; several parallel distribution beams are fixed on the cantilevered part of the embedded load-bearing beam, and the embedded load-bearing beam and the distribution beams form a grid frame structure; one end of the support frame is fixedly supported on the outermost distribution beam; the walkway slab is laid on the distribution beam and part of the bottom plate of the box girder.

[0009] According to the above technical solution, the support frame includes a top longitudinal beam, a vertical inner support, and a vertical outer support; the bottom end of the vertical inner support is fixedly connected to the top of the box girder, and the bottom end of the vertical outer support is fixedly connected to the pre-embedded load-bearing beam or the distribution beam; the two ends of the top longitudinal beam are respectively fixedly connected to the top of the vertical inner support and the top of the vertical outer support; the end of the pre-embedded connecting beam is fixedly connected to the middle of the vertical outer support.

[0010] According to the above technical solution, the top of the vertical inner support and the top of the vertical outer support are flush, the top longitudinal beam is horizontally arranged, and the two ends of the top longitudinal beam are fixedly connected to the top of the vertical inner support and the vertical outer support; the track beam is set along the width direction of the box girder, and the track beam is fixedly connected to the lower surface of each top longitudinal beam.

[0011] According to the above technical solution, column base bolts and column base steel plates are provided at the top of the box girder, and the bottom end of the vertical inner support is connected to the top of the box girder through column base bolts and column base steel plates.

[0012] According to the above technical solution, it also includes a top crossbeam, which is set along the width direction of the box girder. One or more top crossbeams are fixedly connected to the upper surface of all the top longitudinal beams, and the two form a crisscross frame structure.

[0013] According to the above technical solution, a diagonal bracing beam is also provided between the vertical outer support and the distribution beam.

[0014] According to the above technical solution, it also includes a safety net, which is installed on the side of the working platform opposite to the box girder and on the two sides adjacent to the box girder; the upper height of the safety net is the same as the height of the pre-embedded connecting beam, and the lower height of the safety net is the same as the height of the distribution beam; and the safety net is connected to the pre-embedded connecting beam, the vertical external support, and the distribution beam respectively by end welding to form a safety enclosure structure.

[0015] This utility model has the following beneficial effects: 1. The bottom of this work platform is supported on the bottom plate of the box girder by a pre-embedded load-bearing beam structure, and a walkway is laid on the pre-embedded load-bearing beam structure as the platform area for construction personnel. Multiple support frames are connected between the pre-embedded load-bearing beam structure and the top surface of the box girder, serving two purposes: first, for the installation of the track beams, and second, to provide vertical support for the cantilevered ends of the pre-embedded load-bearing beam structure. Pre-embedded connecting beams are set between the support frames and the top plate of the box girder, providing lateral support for the support frame structure while forming a stable rectangular frame structure together with the support frames, the pre-embedded support beam structure, and the box girder.

[0016] Based on the above measures, firstly, this working platform only requires the installation nodes of the support frame on the top surface of the box girder; compared with the existing box girder hanging basket system, which requires a large area of ​​installation space to be reserved on the top surface of the box girder, the working platform in this application can significantly reduce the need for installation space on the top of the box girder, providing a construction platform for bridge prestressing tensioning of the box girder in a confined space.

[0017] Secondly, in this working platform, the width and height of the working platform can be adjusted by adjusting the height of the support frame, as well as the cantilever length of the embedded load-bearing beam structure and the cantilever length of the embedded connecting beam, thereby meeting the prestressing tensioning requirements of box girders of various sizes.

[0018] 2. By changing the vertical inner and outer supports, the platform height can be adjusted to accommodate large, medium, and small box girder sections. This platform is applicable to a wide range of section heights.

[0019] 3. By adjusting the length of the embedded load-bearing beam, embedded connecting beam, and top longitudinal beam, the cantilever length can be increased or decreased, allowing for flexible length changes and expansion of the working space when local working space is limited.

[0020] 4. By changing the suspension position of the track beam on the top longitudinal beam, the spatial position of the prestressed tensioning equipment suspended below the slide rail on the track beam can be adjusted to adapt to prestressed tensioning operations at different angles and distances.

[0021] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0023] Figure 1 This is a structural side view of an embodiment provided by this utility model; Figure 2 This is a front view of the structure of an embodiment provided by this utility model; Figure 3 This is a schematic diagram of the connection structure between the top longitudinal beam, the top transverse beam, and the track beam provided in an embodiment of this utility model; Figure 4 yes Figure 2 Sectional view of AA; Figure 5 yes Figure 2 Sectional view of BB; In the diagram, 1. Embedded load-bearing beam structure; 1-1. Embedded load-bearing beam; 1-2. Distribution beam; 2. Embedded connecting beam; 3. Support frame; 3-1. Top longitudinal beam; 3-2. Vertical inner support; 3-3. Vertical outer support; 3-4. Column base bolt; 3-5. Column base steel plate; 4. Track beam; 5. Walkway slab; 6. Top crossbeam; 7. Safety net; 8. Box girder top plate; 9. Box girder bottom plate. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-5The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] During the construction of the box girder, Reference Figures 1-2 As shown, the present invention provides a bridge prestressing tensioning operation platform suitable for confined space operations.

[0028] Example 1 It includes a pre-embedded load-bearing beam structure 1 at the end of the box girder, a pre-embedded connecting beam 2, a support frame 3, a track beam 4, and a walkway slab 5; The embedded load-bearing beam structure is set along the width direction of the box girder. One side of the embedded load-bearing beam structure is embedded in the bottom plate 9 of the box girder, and the other side is cantilevered on the outside of the bottom plate of the box girder. Part of the walkway slab is laid on the embedded load-bearing beam structure, and the other part of the walkway slab overlaps on the bottom plate of the box girder. Several support frames are spaced apart along the width of the box girder. One side of each support frame is fixedly supported on the top surface of the box girder, and the other side is supported on the embedded load-bearing beam structure. The middle of each support frame spans directly above the section of the walkway slab located on the embedded load-bearing beam structure. A track beam is set along the width of the box girder and is fixedly connected to the middle of each support frame. A slide rail is fixedly installed at the bottom of the track beam to support the external suspension components. The position of the suspension components on the slide rail is adjusted in a timely manner after the position of the external prestressing is changed.

[0029] One end of the pre-embedded connecting beam is embedded in the top plate 8 of the box girder, and the other end is fixedly connected to the support frame.

[0030] In Example 1, the bottom of the work platform is supported on the bottom plate of the box girder by a pre-embedded load-bearing beam structure, and a walkway is laid on the pre-embedded load-bearing beam structure as the platform area for construction personnel to operate. Multiple support frames are connected between the pre-embedded load-bearing beam structure and the top surface of the box girder, serving two purposes: first, for the installation of the track beams; and second, to provide vertical support for the cantilevered ends of the pre-embedded load-bearing beam structure. Pre-embedded connecting beams are installed between the support frames and the top plate of the box girder, providing lateral support to the support frame structure while, together with the support frames, the pre-embedded support beam structure, and the box girder, forming a stable rectangular frame structure.

[0031] Based on the above measures, firstly, this working platform only requires the installation nodes of the support frame on the top surface of the box girder; compared with the existing box girder hanging basket system, which requires a large area of ​​installation space to be reserved on the top surface of the box girder, the working platform in this application can significantly reduce the need for installation space on the top of the box girder, providing a construction platform for bridge prestressing tensioning of the box girder in a confined space.

[0032] Secondly, in this working platform, the width and height of the working platform can be adjusted by adjusting the height of the support frame, as well as the cantilever length of the embedded load-bearing beam structure and the cantilever length of the embedded connecting beam, thereby meeting the prestressing tensioning requirements of box girders of various sizes.

[0033] Example 2 Based on Example 1, two preferred forms of pre-embedded load-bearing beam structures are presented. One type, as shown in the figure, includes a pre-embedded load-bearing beam structure comprising several pre-embedded load-bearing beams spaced apart along the width direction of the box girder; one end of the pre-embedded load-bearing beam is pre-embedded in the bottom plate of the box girder, and the other end of the pre-embedded load-bearing beam cantilevered on the outside of the bottom plate of the box girder; one end of the support frame is fixedly supported on the cantilevered part of the pre-embedded load-bearing beam.

[0034] In this structure, the entire platform is supported only by a few independently set pre-embedded load-bearing beams, each pre-embedded load-bearing beam independently supporting one end of a single support frame.

[0035] Another type, as shown in the figure, includes a pre-embedded load-bearing beam structure comprising several pre-embedded load-bearing beams 1-1 spaced apart along the width direction of the box girder, and distribution beams 1-2 arranged along the width direction of the box girder; one end of the pre-embedded load-bearing beam is embedded in the bottom plate of the box girder, and the other end of the pre-embedded load-bearing beam cantilevered on the outside of the bottom plate of the box girder; several parallel distribution beams are fixed on the cantilevered parts of the pre-embedded load-bearing beams, and the pre-embedded load-bearing beams and distribution beams form a grid frame structure; one end of the support frame is fixedly supported on the outermost distribution beam; the walkway slab is laid on the distribution beams and part of the bottom plate of the box girder.

[0036] All embedded load-bearing beams are connected into a whole by using distribution beams. By setting different numbers of distribution beams, the load is evenly transferred to the embedded load-bearing beams. The size and form of the embedded load-bearing beams can be adjusted according to the size of the load transferred from above. I-beams, channel steel, square steel, etc. can be used.

[0037] In the above embodiment 2, in a single support frame, the support frame includes a top longitudinal beam 3-1, a vertical inner support 3-2, and a vertical outer support 3-3; the bottom end of the vertical inner support is fixedly connected to the top of the box girder, and the bottom end of the vertical outer support is fixedly connected to the pre-embedded load-bearing beam or the distribution beam; the two ends of the top longitudinal beam are respectively fixedly connected to the top of the vertical inner support and the top of the vertical outer support; the end of the pre-embedded connecting beam is fixedly connected to the middle of the vertical outer support.

[0038] The tops of the inner and outer vertical supports are aligned, and the top longitudinal beams are horizontally arranged, with both ends of the top longitudinal beams fixedly connected to the tops of the inner and outer vertical supports. The track beams are horizontally arranged along the width of the box girder, and the track beams are fixedly connected to the lower surface of each top longitudinal beam. The track beams are suspended and welded to the top longitudinal beams, and their positions can be adjusted at any time according to the requirements of prestressing.

[0039] The tops of the vertical inner support and the vertical outer support are flush. The top longitudinal beams are laid out horizontally, and both ends of the top longitudinal beams are fixedly connected to the tops of the vertical inner support and the vertical outer support. The track beams are laid out horizontally along the width of the box girder, and the track beams are fixedly connected to the lower surface of each top longitudinal beam.

[0040] The top of the box girder is equipped with column base bolts 3-4 and column base steel plates 3-5. The bottom end of the vertical inner support is connected to the top of the box girder through the column base bolts and the column base steel plates. The column base steel plates are fixed to the top plate of the box girder by the column base bolts, and the bottom end of the vertical inner support is welded and fixed to the column base steel plates.

[0041] Example 3 Based on the above embodiments, to improve the overall strength of the work platform, a top crossbeam 6 is also included. This top crossbeam is arranged along the width direction of the box girder, and one or more top crossbeams are fixedly connected to the upper surfaces of all the top longitudinal beams, forming a crisscrossing frame structure. The top crossbeams connect all the supporting frames, and their number can be varied according to the length of the top longitudinal beams.

[0042] Example 4 Based on the above embodiments, in order to improve the overall strength of the support frame, a diagonal bracing beam is also provided between the vertical outer support and the distribution beam.

[0043] Example 5 Based on the above embodiments, in order to improve the safety of the work platform, a safety net 7 is also included. The safety net is installed on the side of the work platform opposite to the box girder and on the two sides adjacent to the box girder. The upper height of the safety net is the same as the height of the pre-embedded connecting beam, and the lower height of the safety net is the same as the height of the distribution beam. The safety net is connected to the pre-embedded connecting beam, the vertical external support, and the distribution beam respectively by end welding to form a safety enclosure structure.

[0044] Preferably, the fixed connection between the beams is mainly achieved by welding, but it can also be fixed by bolts or fasteners.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A bridge prestress tensioning operation platform suitable for operation in a confined space, characterized in that: This includes the embedded load-bearing beam structure at the end of the box girder, the embedded connecting beam, the support frame, the track beam, and the walkway slab; The embedded load-bearing beam structure is set along the width direction of the box girder. One side of the embedded load-bearing beam structure is embedded in the bottom plate of the box girder, and the other side cantilevered on the outside of the bottom plate of the box girder. Part of the walkway slab is laid on the embedded load-bearing beam structure, and the other part of the walkway slab overlaps on the bottom plate of the box girder. Several support frames are spaced apart along the width of the box girder. One side of the support frame is fixedly supported on the top surface of the box girder, and the other side of the support frame is supported on the embedded load-bearing beam structure. The middle part of the support frame spans directly above the part of the walkway slab located on the embedded load-bearing beam structure. The track beam is set along the width of the box girder and is fixedly connected to the middle of each support frame. A slide rail is provided at the bottom of the track beam, which is used to support the external suspended components. One end of the pre-embedded connecting beam is embedded in the top plate of the box girder, and the other end is fixedly connected to the support frame.

2. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 1, characterized in that: The embedded load-bearing beam structure includes several embedded load-bearing beams spaced apart along the width of the box girder; one end of the embedded load-bearing beam is embedded in the bottom plate of the box girder, and the other end of the embedded load-bearing beam cantilevered on the outside of the bottom plate of the box girder; one end of the support frame is fixedly supported on the cantilevered part of the embedded load-bearing beam.

3. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 1, characterized in that: The embedded load-bearing beam structure includes several embedded load-bearing beams spaced apart along the width direction of the box girder, and distribution beams arranged along the width direction of the box girder; one end of the embedded load-bearing beam is embedded in the bottom plate of the box girder, and the other end of the embedded load-bearing beam cantilevered on the outside of the bottom plate of the box girder; several parallel distribution beams are fixed on the cantilevered part of the embedded load-bearing beam, and the embedded load-bearing beam and the distribution beams form a grid frame structure; one end of the support frame is fixedly supported on the outermost distribution beam; the walkway slab is laid on the distribution beam and part of the bottom plate of the box girder.

4. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 2 or 3, characterized in that: The support frame includes a top longitudinal beam, vertical inner supports, and vertical outer supports; the bottom end of the vertical inner supports is fixedly connected to the top surface of the box girder, and the bottom end of the vertical outer supports is fixedly connected to the pre-embedded load-bearing beam or the distribution beam; the two ends of the top longitudinal beam are fixedly connected to the top ends of the vertical inner supports and the vertical outer supports, respectively; the end of the pre-embedded connecting beam is fixedly connected to the middle of the vertical outer supports.

5. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 4, characterized in that: The tops of the vertical inner support and the vertical outer support are flush. The top longitudinal beams are laid out horizontally, and both ends of the top longitudinal beams are fixedly connected to the tops of the vertical inner support and the vertical outer support. The track beams are set along the width of the box girder, and the track beams are fixedly connected to the lower surface of each top longitudinal beam.

6. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 4, characterized in that: The top of the box girder is provided with column base bolts and column base steel plates, and the bottom end of the vertical inner support is connected to the top of the box girder through column base bolts and column base steel plates.

7. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 4, characterized in that: It also includes top crossbeams, which are arranged along the width of the box girder. One or more top crossbeams are fixedly connected to the upper surface of all the top longitudinal beams, forming a crisscrossing frame structure.

8. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 4, characterized in that: An inclined bracing beam is also provided between the vertical outer support and the distribution beam.

9. The bridge pre-stress tensioning operation platform suitable for operation in a confined space according to claim 4, characterized in that: The safety net is arranged on the side opposite to the box girder and the two sides adjacent to the box girder of the operation platform, the upper part of the safety net has the same height as the embedded connecting beam, the lower part of the safety net has the same height as the distribution beam, and the safety net is connected with the embedded connecting beam, the vertical outer support and the distribution beam through end welding, thereby forming a safety enclosure structure.

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