Wedge-shaped jacking mechanism
The wedge-shaped jacking mechanism, through the cooperation of wedge blocks and jacks, solves the problem of limited space during bridge bearing replacement, and achieves efficient and safe bearing maintenance and replacement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-03-31
AI Technical Summary
When replacing bridge bearings, conventional jacks are difficult to operate within the limited space of the bridge piers, resulting in high work difficulty, large workload, high cost, and high safety risks.
Design a wedge-shaped lifting mechanism, including a lifting base, a wedge block assembly, and a jack. Lifting and lowering are achieved through the relative movement of the wedge blocks. It occupies little height space, uses a small jacking force to lift large structures, and avoids the need for temporary support through a self-locking mechanism.
It enables efficient maintenance and replacement of bridge bearings in a small space, reducing the difficulty, workload and safety risks, and eliminating the need for additional support structures.
Smart Images
Figure CN224063293U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lifting device technology. More specifically, this utility model relates to a wedge-shaped lifting mechanism. Background Technology
[0002] As bridges operate, they require regular maintenance and repair. Bridge plate rubber bearings have a design life of only 20-30 years, while spherical and pot bearings have longer lifespans. However, as operational time progresses, bridge bearings also require maintenance, repair, and replacement. Most bridges have very limited planar and vertical space on the piers besides the bearings, making it insufficient to install conventional jacks when replacing bearings. This results in significant work difficulty, large-scale temporary measures, high costs, and high safety risks when replacing jacks. Utility Model Content
[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.
[0004] To achieve these objectives and other advantages according to the present invention, a wedge-shaped lifting mechanism is provided, comprising:
[0005] A lifting base, on which lifting jacks and lowering jacks are horizontally installed;
[0006] The wedge block assembly includes a lower wedge block and an upper wedge block, which are arranged vertically opposite each other, and their opposite end faces are inclined planes with the same slope. The movable ends of the lifting jack and the lowering jack are both connected to the lower wedge block to drive the lower wedge block to slide horizontally along the lifting base, thereby driving the upper wedge block to move vertically up and down relative to the lifting base.
[0007] Preferably, the acute angle between the inclined surface of the lower wedge block and the horizontal plane is less than twice the friction angle of the contact surface between the lower wedge block and the upper wedge block.
[0008] Preferably, the lifting base includes a base plate and end plates disposed on both sides of the base plate; the wedge block assembly is disposed between the two end plates.
[0009] Preferably, a sliding plate is fixedly mounted on the base plate, a guide rod is provided on the sliding plate along the sliding direction of the lower wedge block, and a groove is provided on the bottom surface of the lower wedge block to cooperate with the guide rod.
[0010] Preferably, the lifting jack and the unloading jack are respectively disposed on both sides of the same end plate, wherein the lifting jack is disposed on the side of the end plate facing the wedge block assembly.
[0011] Preferably, it also includes several pads, which are placed between the lower wedge block and the lifting jack during the lifting process of the lifting jack.
[0012] Preferably, the unloading jack is a through-hole jack, which is connected to the lower wedge block by a precision-rolled threaded steel bar. One end of the precision-rolled threaded steel bar is threadedly connected to the lower wedge block, and the other end passes through the end plate, the unloading jack and the anchor plate in sequence and is then fixed by a nut.
[0013] This utility model has at least the following beneficial effects:
[0014] 1. The wedge-shaped jacking mechanism provided by this utility model has a horizontally arranged lifting jack and a lowering jack. The lifting and lowering of the structure can be achieved through the relative movement of the upper wedge block and the lower wedge block. It occupies little height space and can carry out jacking operations in a small space. Furthermore, it can use a small jacking force to lift large structures, thereby enabling the maintenance and replacement of bridge supports.
[0015] 2. The wedge-shaped lifting mechanism provided by this utility model has an upper wedge block and a lower wedge block that can form a self-locking mechanism, so no other temporary support is required during the lifting and unloading process.
[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description
[0017] Figure 1 This is a side view of the wedge-shaped lifting mechanism of this utility model.
[0018] Figure 2 This is a side view of the lifting base of this utility model;
[0019] Figure 3 This is a side view of the wedge-shaped lifting mechanism during the installation of the precision-rolled threaded steel according to this utility model. Detailed Implementation
[0020] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.
[0021] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.
[0022] like Figures 1-3 As shown, this utility model provides a wedge-shaped lifting mechanism, comprising:
[0023] A lifting base 1, on which a lifting jack 3 and a lowering jack 4 are horizontally mounted;
[0024] The wedge block assembly 2 includes a lower wedge block 21 and an upper wedge block 22, which are arranged opposite each other and have the same slope on their opposite end faces. The movable ends of the lifting jack 3 and the unloading jack 4 are connected to the lower wedge block 21 to drive the lower wedge block 21 to slide horizontally along the lifting base 1, thereby driving the upper wedge block 22 to move vertically up and down relative to the lifting base 1.
[0025] In this technical solution, the wedge-shaped lifting mechanism is arranged on the bridge pier. During lifting, the lower wedge-shaped slider 21 is horizontally lifted by the lifting jack, while the upper wedge-shaped slider 22 moves upward as the lower wedge-shaped slider 21 slides horizontally, thus lifting the beam. After replacing the support, the lower wedge-shaped block 21 is moved in the opposite direction by the unloading jack 4, at which time the upper wedge-shaped block 22 moves downward, and the beam is switched to be supported by the support. The lifting jack 3 and the unloading jack 4 are arranged horizontally. The relative movement of the upper wedge-shaped block 22 and the lower wedge-shaped block 21 realizes the lifting and lowering of the structure. It occupies little height space and can use a small jacking force to lift large structures, thereby realizing the maintenance and replacement of bridge supports.
[0026] In another technical solution, the acute angle between the inclined surface of the lower wedge block 21 and the horizontal plane is less than twice the friction angle of the contact surface between the lower wedge block 21 and the upper wedge block 22, so that when the lifting jack 3 and the unloading jack 4 stop lifting, a self-locking mechanism is formed between the lower wedge block 21 and the upper wedge block 22.
[0027] In another technical solution, the lifting base 1 includes a base plate 11 and end plates 12 disposed on both sides of the base plate 11; the wedge block assembly 2 is disposed between the two end plates 12. The end plates 12 are used to install the lifting jack 3 and the lowering jack 4, and to limit the wedge block assembly 2 in the horizontal direction. Preferably, the base plate 11 is also provided with side plates 13 to prevent the wedge block assembly 2 from shifting and to provide protection.
[0028] Furthermore, a sliding plate 14 is fixedly mounted on the base plate 11. A guide rod is provided on the sliding plate 14 along the sliding direction of the lower wedge block 21. A groove is formed on the bottom surface of the lower wedge block 21 to cooperate with the guide rod. The guide rod guides the lower wedge block 21, ensuring its stability during horizontal sliding. The upper surface of the sliding plate 14 is polished and lubricated to reduce the coefficient of friction between it and the lower wedge block.
[0029] In another technical solution, the lifting jack 3 and the unloading jack 4 are respectively arranged on both sides of the same end plate 12, wherein the lifting jack 3 is arranged on the side of the end plate 12 facing the wedge block group 2.
[0030] When the single lifting stroke of the lifting jack is insufficient to meet the lifting requirements, several pads 7 can be installed between the lower wedge block 21 and the lifting jack 3 during the lifting process. When the lifting jack's stroke is exhausted, its movable end retracts, at which point a self-locking mechanism is formed between the lower wedge block 21 and the upper wedge block 22. The pads 7 are then added between the lower wedge block 21 and the lifting jack 3 to increase the jacking stroke. The above process is repeated until the beam is lifted to the predetermined position.
[0031] In another technical solution, the unloading jack 4 is a through-type jack, which is connected to the lower wedge block 21 via a precision-rolled threaded steel bar 6. One end of the precision-rolled threaded steel bar 6 is threaded to the lower wedge block 21, and the other end passes through the end plate 12, the unloading jack 4, and the anchor plate 5 in sequence before being fixed by a nut. The unloading jack 4 lifts, pulling the lower wedge block 21 to move in the opposite direction, causing the upper wedge block 22 to fall, thereby pulling the beam body down. During the movement of the lower wedge block 21, the pad block 7 is gradually removed.
[0032] When using the wedge-shaped lifting mechanism to replace the support, the specific steps include:
[0033] Step 1: Arrange the lifting base 1, wedge block assembly 2, lifting jack 3, and lowering jack sequentially on the bridge pier, and connect the lifting jack 3 to the oil inlet pipe, oil outlet pipe, and oil pump. At this time, the precision-rolled threaded steel bar 6 and the anchor plate 5 are not installed.
[0034] Step 2: Lifting jack 3 is used for lifting. Lifting jack 3 pushes the lower wedge block 21 to slide to the right. The lower wedge block 22 rises along with the sliding of the upper wedge block 21, lifting the beam.
[0035] Step 3: After the lifting jack 3 has exhausted its lifting stroke, the plunger retracts, and the upper wedge block 21 and lower wedge block 22 form a self-locking mechanism. At this time, a shim is added between the lifting jack 3 and the upper wedge block 21 to increase the jacking stroke. Repeat the above process until the lifting beam reaches the predetermined position. Then, perform support replacement and maintenance work.
[0036] Step 4: Install anchor plate 5 and precision-rolled threaded steel bar 6, and anchor them using nuts. Connect the jack 4 to the oil inlet pipe, oil outlet pipe, and oil pump.
[0037] Step 5: Dismount jack 4 to lift the beam. The threaded steel bar 6, threaded to the upper wedge block 21, pulls the upper wedge block 21 in the opposite direction of lifting, causing the lower wedge block 22 to fall, thus lowering the beam. After the lifting stroke of jack 4 is exhausted, the plunger retracts. Adjust the position of the anchor plate 5 and nut, and perform the next lifting operation until the lower wedge plate 21 returns to its starting position and the upper wedge block 22 has fallen completely.
[0038] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A wedge jacking mechanism, characterized by, The utility model relates to a lifting device for lifting and unloading a heavy object, comprising: a lifting base horizontally provided with a lifting jack and an unloading jack; a wedge group comprising a lower wedge and an upper wedge, the lower wedge and the upper wedge being arranged oppositely and having opposite end faces with the same slope; the movable ends of the lifting jack and the unloading jack are connected with the lower wedge to drive the lower wedge to slide horizontally along the lifting base, thereby driving the upper wedge to move up and down in the vertical direction relative to the lifting base.
2. The wedge jacking mechanism of claim 1, wherein, The acute angle between the slope of the lower wedge and the horizontal plane is less than twice the friction angle of the contact surface between the lower wedge and the upper wedge.
3. The wedge jacking mechanism of claim 1, wherein, The lifting base comprises a bottom plate and end plates arranged on both sides of the bottom plate; the wedge group is arranged between the two end plates.
4. The wedge jacking mechanism of claim 3, wherein, The bottom plate is fixedly provided with a sliding plate, the sliding plate is provided with a guide rod in the sliding direction of the lower wedge, and the bottom surface of the lower wedge is provided with a groove matched with the guide rod.
5. The wedge jacking mechanism of claim 3, wherein, The lifting jack and the unloading jack are arranged on both sides of the same end plate respectively, and the lifting jack is arranged on the side of the end plate facing the wedge group.
6. The wedge jacking mechanism of claim 5, wherein, The utility model further comprises a plurality of spacers arranged between the lower wedge and the lifting jack during the lifting process of the lifting jack.
7. The wedge jacking mechanism of claim 3, wherein, The unloading jack is a through-type jack connected with the lower wedge through a fine rolled threaded steel, one end of the fine rolled threaded steel is threadedly connected with the lower wedge, the other end sequentially passes through the end plate, the unloading jack and an anchor plate and is fixed by a nut.