Simple movable pushing limiter of steel box girder
By designing a simple, movable jacking limiter and using a combination of L-shaped steel plates and anchor rods for clamping and positioning, the problem of low efficiency and large error of traditional limiting devices was solved, and efficient and precise jacking of steel box girders was achieved.
Patent Information
- Application Number
- CN202423022192.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Traditional jacking and limiting devices are inefficient and prone to errors during steel box girder construction, making it difficult to ensure that the web plate is flush with the lower pad, resulting in localized damage to the bottom plate of the steel box girder.
A simple movable jacking limiter is designed. It utilizes an L-shaped steel plate, Z-direction jacking bolts, and anchor rods. By adjusting the edge of the support web to be flush with the edge of the lower pad, the center line of the jacking is made to coincide. The positioning is achieved by a combination of Z-direction jacking bolts and anchor rods.
It improves construction efficiency, reduces errors, has a simple and easy-to-implement structure, ensures that the web plate is flush with the edge of the lower pad, and avoids damage to the bottom plate of the steel box girder.
Smart Images
Figure CN223620789U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of track construction technology, specifically a simple movable jacking limiter for steel box girders. Background Technology
[0002] In modern bridge engineering, the bridge launching method has been rapidly adopted due to its advantages, including smaller construction area, uninterrupted construction process, good structural integrity, reusable equipment and formwork, noiseless operation, and faster construction speed. When using the launching system, the large reaction force of the jacks necessitates ensuring that the lower support pads are accurately positioned on the centerline of the box girder web during launching and lowering. Otherwise, misalignment can cause localized damage to the bottom plate of the box girder. Therefore, taking necessary limiting measures during the launching and lowering process is crucial.
[0003] Traditional jacking restraint devices typically consist of a fixed limiter on the outer side of the steel box girder's bottom plate, welded to the lower support pad; the inner side generally relies on a combination of axis alignment and manual control. Traditional jacking restraint measures impose significant limitations on the bridge structure's geometry and require visual inspection and manual adjustment before jacking and lowering the girder, resulting in low efficiency and large errors. Therefore, developing a simple, movable jacking restraint device for steel box girders is of significant practical importance.
[0004] Therefore, how to design a simple movable jacking limiter for steel box girders to solve the above-mentioned technical problems has become an urgent technical problem for those in the field. Utility Model Content
[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this utility model is to propose a simple movable jacking limiter for steel box girders. This jacking limiter uses the lower support pad as a reference to adjust the supporting web, effectively ensuring that the edge of the web is flush with the edge of the lower support pad, thereby ensuring that the center lines of the two support coincide, improving construction efficiency while effectively reducing errors. Moreover, the structure is simple and easy to implement.
[0006] To address the aforementioned issues, this utility model discloses a simple movable jacking limiter for steel box girders. The forward and backward translational direction of the steel box girder is defined as the X-direction, the left and right translational direction as the Y-direction, and the vertical lifting direction as the Z-direction. The bottom of the steel box girder is provided with a web plate, and the bottom surface of the web plate is supported by a stepping jack and a lower pad on both sides. The limiter is fastened in the Y-direction to the sides of the web plate and the lower pad to fit and constrain the edges of the web plate and the lower pad to be flush. The limiter is also located at both ends of the lower pad in the X-direction.
[0007] Limited, the limiter includes an L-shaped steel plate, a Z-direction tightening bolt and an anchor rod; the upper part of the L-shaped steel plate is Y-directly fastened to both sides of the top surface of the web and Z-direction tightening bolts are threaded in the Z direction; the middle part of the L-shaped steel plate is laterally hooked to the edge of the web and the lower pad; and the bottom of the L-shaped steel plate extends to the bottom of the web and is Y-direction threaded to the anchor rod.
[0008] Preferably, a Z-direction mating nut is fixedly provided on the upper part of the L-shaped steel plate, and a Z-direction tightening bolt is connected to the upper part of the L-shaped steel plate through the Z direction; the Z-direction mating nut is welded and fixed on the top surface of the L-shaped steel plate, and the middle part of the Z-direction mating nut is axially penetrated and threadedly connected to the Z-direction tightening bolt; the bottom of the Z-direction tightening bolt is adjusted and supported on the top surface of the web plate.
[0009] Preferably, one end of the anchor rod is fixed with a steel anchor that is attached to the inner side wall of the lower pad, the middle section of the anchor rod is radially supported on the bottom surface of the web, and the other end of the anchor rod penetrates in the Y direction and is threaded to the side wall of the lower part of the L-shaped steel plate.
[0010] Preferably, a Y-direction mating nut is welded and fixed to the lower side wall of the L-shaped steel plate; the anchor rod penetrates the lower side wall of the L-shaped steel plate and is threadedly connected to the Y-direction mating nut.
[0011] The advantages of this utility model compared with the prior art are as follows:
[0012] This utility model discloses a simple movable jacking limiter for a steel box girder. First, the sidewall of an L-shaped steel plate supports the lower support pad and the edge sidewall of the web plate to ensure their edges are flush. During this process, the bottom end of the Z-direction tightening bolt provides a downward limit for the L-shaped steel plate, while the circumferential outer wall of the anchor rod provides an upward limit. In other words, the Z-direction tightening bolt, in conjunction with the anchor rod, clamps and positions the L-shaped steel plate in the Z-direction. Second, the anchor rod provides Y-direction tensioning and fixation for the L-shaped steel plate and the lower support pad. Ultimately, this achieves the limiting and connecting function of the jacking limiter. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is the front view of this utility model;
[0015] Figure 2 This is a three-dimensional structural schematic diagram of the present invention (viewed from below at 45°).
[0016] Figure 3 This is a three-dimensional structural schematic diagram of the present invention (viewed from above at 45°).
[0017] In the diagram: 1-web plate; 2-steel anchor; 3-anchor bolt; 4-Z-direction tightening bolt; 5-L-shaped steel plate; 6-lower shim; 7-stepping jack; 8-Z-direction mating nut; 9-Y-direction mating nut. Detailed Implementation
[0018] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0020] The present invention will now be described in further detail with reference to the accompanying drawings.
[0021] Combination Figures 1-3 This utility model discloses a simple movable jacking limiter for a steel box girder. The forward and backward translation direction of the steel box girder is defined as the X direction, the left and right translation direction as the Y direction, and the vertical lifting direction as the Z direction. The bottom of the steel box girder is provided with a web plate 1. The bottom surface of the web plate is supported by the stepping top 7 and the lower pad 6 through the jacking. The limiter is fastened in the Y direction to the side of the web plate and the lower pad to fit and constrain the edges of the web plate and the lower pad to be flush. The limiter is arranged at both ends of the lower pad in the X direction.
[0022] Preferably, the limiter includes an L-shaped steel plate 5, a Z-direction tightening bolt 4, and an anchor rod 3; the upper part of the L-shaped steel plate is Y-directly fastened to both sides of the top surface of the web and Z-direction tightening bolts are threaded in the Z direction; the middle part of the L-shaped steel plate is laterally hooked to the edge of the web and the lower pad; and the bottom of the L-shaped steel plate extends to the bottom of the web and is Y-direction threaded to the anchor rod.
[0023] Preferably, a Z-direction mating nut 8 is fixedly provided on the upper part of the L-shaped steel plate, and a Z-direction tightening bolt is connected to the upper part of the L-shaped steel plate through the Z direction; the Z-direction mating nut is welded and fixed on the top surface of the L-shaped steel plate, and the middle part of the Z-direction mating nut is axially penetrated and threadedly connected to the Z-direction tightening bolt; the bottom of the Z-direction tightening bolt is adjusted and supported on the top surface of the web plate.
[0024] Preferably, one end of the anchor rod is fixed with a steel anchor 2 that is hung on the inner side wall of the lower pad, the middle section of the anchor rod is radially supported on the bottom surface of the web, and the other end of the anchor rod penetrates in the Y direction and is threaded to the side wall of the lower part of the L-shaped steel plate.
[0025] Preferably, a Y-direction mating nut 9 is welded and fixed on the lower side wall of the L-shaped steel plate; the anchor rod penetrates the lower side wall of the L-shaped steel plate and is threadedly connected to the Y-direction mating nut.
[0026] It should be noted that one end of the anchor rod penetrates and is connected to the vertical side wall of the lower part of the L-shaped steel plate through the Y-direction mating nut. Because the vertical side wall of the other side of the lower part of the L-shaped steel plate needs to fit and constrain the side wall of the lower pad and the web, and the outer periphery of the middle section of the anchor rod needs to counteract the reaction force of the Z-direction tightening bolt and abut against the bottom surface of the web, this connection structure avoids the lower pad interfering with the position of the anchor rod. This is also the main reason why the push limiter is arranged at both ends of the lower pad in this utility model.
[0027] The working principle of this utility model is as follows:
[0028] During operation, the web plate is first hoisted and placed on the lower support pad. At this time, the lower support pad is not flush with the edge of the web plate. L-shaped steel plates with anchor rods need to be hung on both ends of the lower support pad in the X direction in the Y direction. Then, by tightening the Y-direction matching nuts, the side wall of the L-shaped steel plate is made to fit against the edge of the lower support pad and the web plate to ensure that the two are flush. Finally, the Z-direction tightening bolts are tightened. As the bottom end of the Z-direction tightening bolts pushes downward against the top surface of the web plate, the anchor rods limit the upward movement of the L-shaped steel plate, and the overall jacking limiter is firmly clamped in the Z direction on the top and bottom surfaces of the web plate.
[0029] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. A simple movable jacking limiter for a steel box girder, defining the forward and backward translational direction of the steel box girder as the X-axis, the left and right translational direction as the Y-axis, and the vertical lifting direction as the Z-axis; the bottom of the steel box girder is provided with a web, and the bottom surface of the web is supported by a stepping jack on both sides via a lower pad; characterized in that: The limiter is fastened in the Y direction to the side of the web and the lower pad to fit and constrain the edges of the web and the lower pad, and the limiter is arranged at both ends of the lower pad in the X direction.
2. The simple movable jacking limiter for steel box girders according to claim 1, characterized in that: The limiter includes an L-shaped steel plate, a Z-direction tightening bolt, and an anchor rod; the upper part of the L-shaped steel plate is Y-directly fastened to both sides of the top surface of the web and Z-direction tightening bolts are threaded in the Z direction; the middle part of the L-shaped steel plate is laterally hooked to the edge of the web and the lower pad; and the bottom of the L-shaped steel plate extends to the bottom of the web and is Y-direction threaded to the anchor rod.
3. A simple movable jacking limiter for steel box girders according to claim 2, characterized in that: The upper part of the L-shaped steel plate is fixed with a Z-direction mating nut, and the upper part of the L-shaped steel plate is connected to a Z-direction tightening bolt through the Z direction; the Z-direction mating nut is welded and fixed to the top surface of the L-shaped steel plate, and the middle part of the Z-direction mating nut is axially penetrated and threadedly connected to the Z-direction tightening bolt; the bottom of the Z-direction tightening bolt is adjusted and supported on the top surface of the web plate.
4. A simple movable jacking limiter for steel box girders according to claim 2, characterized in that: One end of the anchor rod is fixed with a steel anchor that is hung on the inner side wall of the lower pad, the middle section of the anchor rod is radially supported on the bottom surface of the web plate, and the other end of the anchor rod penetrates in the Y direction and is threaded to the side wall of the lower part of the L-shaped steel plate.
5. A simple movable jacking limiter for steel box girders according to claim 4, characterized in that: A Y-direction mating nut is welded and fixed to the lower side wall of the L-shaped steel plate; the anchor rod penetrates the lower side wall of the L-shaped steel plate and is threadedly connected to the Y-direction mating nut.