A slope adjusting device for construction of a variable cross-section beam by incremental launching

Abstract

The application provides a slope adjusting device for the incremental launching construction of a variable cross-section beam, which is characterized by comprising a base, a support base and a top base, the support base is fixed above the base, and one end of the top base is hinged to the support base; the base is provided with a low-position support mechanism, a middle-position support mechanism and a high-position support mechanism, the low-position support mechanism is provided with a low-position jacking post which is vertically adjusted in extension and retraction, the middle-position support mechanism is provided with a middle-position jacking post which is vertically adjusted in extension and retraction, and the high-position support mechanism is provided with a high-position jacking post which is vertically adjusted in extension and retraction; the top of the low-position jacking post, the top of the middle-position jacking post and the top of the high-position jacking post are all provided with a matching head, the lower surface of the top base is provided with a matching groove corresponding to the matching head of each jacking post top, and the support base is provided with a through hole corresponding to each support mechanism. The application can continuously adjust the slope of the top base by adjusting the jacking post in extension and retraction, and effectively expands the applicability of the step-by-step incremental launching method in the construction of a variable cross-section steel box beam on a complex longitudinal slope.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and in particular relates to a slope adjustment device for the jacking construction of variable cross-section beams. Background Technology

[0002] In recent years, with the rapid development of urban construction, a large number of overpass bridge projects involving crossing existing roads or air routes have emerged. These projects generally face challenges such as tight construction schedules, complex on-site conditions, and high difficulty in construction organization. In the construction of variable cross-section steel box girders across river channels, traditional methods often employ large floating cranes for overall hoisting. However, due to limitations in navigation conditions, riverbed topography, or space in some areas, the necessary conditions for large floating cranes to operate, such as water depth, clearance, or working surface, are often unavailable, making this traditional method impractical and necessitating the use of the step-by-step jacking method. However, existing jacking construction technology is insufficiently adaptable to variable cross-section steel box girders with significant changes in the longitudinal slope of the girder bottom, making it difficult to effectively adapt to the attitude adjustments of the variable cross-section girder during the jacking process, resulting in high construction risks and difficulties in precision control. Therefore, in overpass projects constrained by navigation and riverbed conditions and requiring the construction of variable cross-section steel box girders, there is an urgent need for an efficient, safe, and adaptable construction method to overcome the limitations of existing technologies. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a slope adjustment device for the jacking construction of variable cross-section beams.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows: A slope adjustment device for jacking construction of variable cross-section beams includes a base, a support base, and a top base. The support base is fixed above the base, and one end of the top base is hinged to the support base. The base is provided with a low-position support mechanism, a middle-position support mechanism, and a high-position support mechanism. The low-position support mechanism is provided with a low-position top column that can be adjusted vertically, the middle-position support mechanism is provided with a middle-position top column that can be adjusted vertically, and the high-position support mechanism is provided with a high-position top column that can be adjusted vertically. The top of the low-position top column, the top of the middle-position top column, and the top of the high-position top column are all provided with mating heads. The lower surface of the top base is provided with mating grooves corresponding to the mating heads at the top of each top column. The support base is provided with through holes corresponding to each support mechanism.

[0005] Furthermore, the mating head adopts a ball-head structure, and the mating groove adopts an arc-shaped groove.

[0006] Furthermore, a support sleeve is provided between the base and the support seat for each support mechanism, and the support sleeve is set in a one-to-one correspondence with the through hole.

[0007] Furthermore, a rib is provided between the lower end of the support sleeve and the base.

[0008] Furthermore, a rib is provided between the upper end of the support sleeve and the support base.

[0009] Furthermore, each top column has a connecting section extending into the support sleeve at its lower end. The outer wall of the connecting section has an external thread structure, and the inner wall of the support sleeve has an internal thread structure that matches the external thread structure of the connecting section.

[0010] Furthermore, each top column has an external hexagonal operating part between its mating head and the connecting section.

[0011] Furthermore, a gap is left between the outer wall of each top column and the inner wall of the corresponding through hole.

[0012] Furthermore, the base and the support are arranged in parallel, and the base and the support are fixed together by a transverse partition.

[0013] Furthermore, the top seat is provided with double ear plates, and the support seat is provided with a lower ear handle corresponding to the position of the double ear plates of the top seat. The double ear plates and the lower ear handle are hinged together by a pivot.

[0014] Compared with existing technologies, the present invention has the following advantages: This invention provides a slope adjustment device for the jacking construction of variable cross-section beams. It has millimeter-level slope adjustment capability, which can accurately match the design longitudinal slope of the bottom of the variable cross-section box girder along the jacking path, significantly reducing the amount of subsequent correction work. This ensures that each support point of the beam is evenly and fully stressed, effectively eliminating local stress concentration caused by inadequate support, avoiding damage to the steel box girder due to excessive local stress, and significantly improving the overall stability of the support system. In addition, this device can quickly respond to changes in the longitudinal slope of the bottom of the beam, replacing the cumbersome process of frequently replacing or adjusting a large number of pads and wedges in traditional methods. It also eliminates long construction interruptions caused by finding, transporting, installing, and debugging temporary support components, ensuring the continuous and efficient jacking process. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of the structure created by this invention; Figure 2 This invention provides a cross-sectional schematic diagram; Figure 3 A schematic diagram illustrating the lower surface of the top seat for this invention; Figure 4 A side view of the double-eared plate in this invention; Figure 5 A side view of the lower ear stem is provided for the present invention; Figure 6In the embodiments of the present invention, the top seat is relative to Figure 1 A schematic diagram after the lifting operation. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] A slope adjustment device for jacking construction of variable cross-section beams, such as Figures 1 to 6As shown, the system includes a base 1, a support 2, and a top 3. A rubber pad 21 is provided on the upper surface of the top 3. The support 3 is fixed above the base, and one end of the top 3 is hinged to the support 3. The base has a low-position support mechanism 4, a middle-position support mechanism 5, and a high-position support mechanism 6. The low-position support mechanism has a low-position top column 7 that can be adjusted vertically, the middle-position support mechanism has a middle-position top column 8 that can be adjusted vertically, and the high-position support mechanism has a high-position top column 9 that can be adjusted vertically. Each of the top columns has a mating head 10. The lower surface of the top 3 has a mating groove 12 corresponding to the mating head of each top column. The support 3 has through holes 11 corresponding to each support mechanism. The top column of the middle-position support mechanism (with its mating head at the upper edge) is higher than the top column of the low-position support mechanism, and the top column of the middle-position support mechanism (with its mating head at the upper edge) is lower than the top column of the high-position support mechanism.

[0021] One end of the top seat is hinged to the top of the support base, allowing the top seat to rotate around the hinge point to adapt to different construction slope requirements. A low-level support mechanism, a middle-level support mechanism, and a high-level support mechanism are sequentially arranged along the length of the base. These three mechanisms are linearly arranged, and their spacing is rationally set according to the stress characteristics of the variable cross-section beam. The low-level support mechanism is equipped with a low-level top column that can be adjusted vertically, the middle-level support mechanism has a corresponding middle-level top column, and the high-level support mechanism is equipped with a high-level top column. All three top columns can be adjusted in height vertically, providing stable support to the top seat to meet the needs of slope adjustment during construction.

[0022] To improve the fit and stress stability between the top column and the top seat, the tops of the low-position, middle-position, and high-position top columns are all integrally formed with mating heads. The lower surface of the top seat has mating grooves corresponding to the positions of each top column, adapted to the mating heads. As a preferred embodiment, the mating heads adopt a spherical structure, and the mating grooves are designed as arc-shaped grooves. This spherical hinge-type mating structure can effectively offset the horizontal shear force and lateral force generated during the jacking construction, avoiding local stress concentration. Simultaneously, through holes are provided on the support base corresponding to the installation positions of the low-position, middle-position, and high-position support mechanisms. The diameter of the through holes is slightly larger than the diameter of each top column (i.e., a gap is left between the outer wall of each top column and the inner wall of the corresponding through hole to avoid interference when rotating and adjusting the top column). This provides sufficient space for the vertical expansion and contraction of the top columns and also plays an auxiliary guiding role in the movement trajectory of the top columns, further ensuring the stability and accuracy of the slope adjustment process.

[0023] The slope adjustment device provided by this invention can continuously adjust the slope of the top seat through the telescopic adjustment of the top column, effectively expanding the applicability of the step-by-step jacking method in the construction of complex longitudinal slope variable cross-section steel box girders. It can significantly reduce labor input and safety risks, has a high equipment turnover rate, and has significant comprehensive economic benefits, with broad engineering application and promotion value.

[0024] Each support mechanism is provided with a support sleeve 13 between the base and the support seat, and the support sleeves are configured to correspond one-to-one with the through holes. Each top column has a connecting section 14 extending into the support sleeve at its lower end. The outer wall of the connecting section has an external thread structure, and the inner wall of the support sleeve has an internal thread structure that matches the external thread structure of the connecting section. Each top column has an external hexagonal operating part 15 between its mating head and the connecting section. In use, rotating the external hexagonal operating part with a wrench rotates the top column, changing the engagement length between the connecting section and the support sleeve, thereby adjusting the height of the support mechanism and raising or lowering the top seat.

[0025] The base and support are arranged in parallel and fixed together by a transverse partition 16. Ribs 17 are provided between the lower end of the support sleeve and the base, and between the upper end of the support sleeve and the support. The base and support together secure the support sleeve, making the structure of each top column more stable.

[0026] The top seat is provided with double ear plates 18, and the support seat is provided with a lower ear handle 19 corresponding to the position of the double ear plates on the top seat. The double ear plates and the lower ear handle are hinged together by a rotating shaft 20. In an optional embodiment, a pointer is installed on the surface of the double ear plates, and an angle scale line is provided on the surface of the lower ear plate. The angle scale line is drawn sequentially with the center point of the rotating shaft as the origin and a step size of 5°. Long lines are set at 0°, 10°, and 20°, and short lines are set at 5° and 15°. In use, the lifting angle of the top plate is observed by observing the relative position of the pointer and the scale line.

[0027] This invention provides a slope adjustment device for the jacking construction of variable cross-section beams. It has millimeter-level slope adjustment capability, which can accurately match the design longitudinal slope of the bottom of the variable cross-section box girder along the jacking path, significantly reducing the amount of subsequent correction work. This ensures that each support point of the beam is evenly and fully stressed, effectively eliminating local stress concentration caused by inadequate support, avoiding damage to the steel box girder due to excessive local stress, and significantly improving the overall stability of the support system. In addition, this device can quickly respond to changes in the longitudinal slope of the bottom of the beam, replacing the cumbersome process of frequently replacing or adjusting a large number of pads and wedges in traditional methods. It also eliminates long construction interruptions caused by finding, transporting, installing, and debugging temporary support components, ensuring the continuous and efficient jacking process.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A slope adjustment device for jacking construction of variable cross-section beams, characterized in that: The device includes a base, a support base, and a top base. The support base is fixed above the base, and one end of the top base is hinged to the support base. The base is equipped with a low-position support mechanism, a middle-position support mechanism, and a high-position support mechanism. The low-position support mechanism has a low-position top column that can be adjusted vertically, the middle-position support mechanism has a middle-position top column that can be adjusted vertically, and the high-position support mechanism has a high-position top column that can be adjusted vertically. Each of the top columns has a mating head. The lower surface of the top base has a mating groove corresponding to the mating heads at the top of each top column. The support base has through holes corresponding to each support mechanism.

2. The slope adjustment device for jacking construction of variable cross-section beams according to claim 1, characterized in that: The mating head adopts a ball head structure, and the mating groove adopts an arc-shaped groove.

3. The slope adjustment device for jacking construction of variable cross-section beams according to claim 1, characterized in that: Each support mechanism is provided with a support sleeve between the base and the support seat, and the support sleeve is set with a one-to-one correspondence with the through hole.

4. The slope adjustment device for jacking construction of variable cross-section beams according to claim 3, characterized in that: A rib is provided between the lower end of the support sleeve and the base.

5. A slope adjustment device for jacking construction of variable cross-section beams according to claim 3, characterized in that: A rib is provided between the upper end of the support sleeve and the support base.

6. The slope adjustment device for jacking construction of variable cross-section beams according to claim 2, characterized in that: Each top column has a connecting section at its lower end that extends into the support sleeve. The outer wall of the connecting section has an external thread structure, and the inner wall of the support sleeve has an internal thread structure that matches the external thread structure of the connecting section.

7. The slope adjustment device for jacking construction of variable cross-section beams according to claim 1, characterized in that: Each top column has an external hexagonal operating part between its mating head and the connecting section.

8. The slope adjustment device for jacking construction of variable cross-section beams according to claim 1, characterized in that: Each top column has a gap between its outer wall and the inner wall of its corresponding through hole.

9. A slope adjustment device for jacking construction of variable cross-section beams according to claim 1, characterized in that: The base and support are arranged in parallel, and are fixed together by a transverse partition.

10. A slope adjustment device for jacking construction of variable cross-section beams according to claim 1, characterized in that: The top seat is provided with double ear plates, and the support seat is provided with a lower ear handle corresponding to the position of the double ear plates of the top seat. The double ear plates and the lower ear handle are hinged together by a pivot.

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