Hollow slab girder single support replacing device
The device, consisting of an inner steel crossbeam, an outer steel crossbeam, and wedge blocks, uses positive and negative screws to drive the steel crossbeams, overcoming the environmental limitations of single support replacement for hollow slab beams and achieving low-cost single support replacement, making it suitable for bridge maintenance in complex environments.
Patent Information
- Application Number
- CN202520282961.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing technologies cannot replace individual supports of hollow slab beams in complex site environments, especially the supports of continuous hollow slab bridge abutments on the back wall. Due to limited operating space, it is impossible to carry out jacking and replacement of the entire row.
The device consists of an inner steel crossbeam, an outer steel crossbeam, wedge blocks, and positive and negative screws. The wedge blocks pry up the steel plate under the support, and the positive and negative screws drive the steel crossbeams to move relative to each other, so as to replace a single support and avoid the need to lift the beam.
Under conditions where the reaction frame construction method is not met, the replacement of a single defective support for a hollow slab beam is achieved. The operation is simple and cost-effective, making it suitable for large-scale promotion and application.
Smart Images
Figure CN223937025U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a single support replacement device for hollow slab beams, belonging to the field of bridge maintenance and reinforcement construction technology. Background Technology
[0002] Currently, the replacement of hollow slab beam bearings usually involves jacking up the entire row for replacement. However, due to the complexity of the actual site conditions and the limited operational space, the use of the whole row jacking method for bearing replacement is greatly restricted. In other words, the current bearing replacement method cannot be used to jack up and replace bearings on continuous hollow slab abutments with back walls. Utility Model Content
[0003] This invention provides a single support replacement device for hollow slab beams, which can promptly eliminate support defects in hollow slab beams and save maintenance costs. It allows for the replacement of defective supports in individual hollow slab beams even when the beam body is not lifted and the site conditions do not meet the requirements for reaction frame construction. The entire set of equipment is inexpensive, easy to operate, and suitable for large-scale application.
[0004] The present invention adopts the following technical solution:
[0005] The hollow slab beam single support replacement device of this utility model includes an inner steel crossbeam, a wedge block, an outer steel crossbeam, and positive and negative threaded rods;
[0006] The lower steel plate of the support is arranged below the hollow slab beam support and is in contact with the hollow slab beam support;
[0007] The inner and outer steel beams are arranged in parallel to each other and are located on both sides of the steel plate under the support.
[0008] Wedge-shaped blocks are respectively arranged opposite to each other on the inner and outer steel crossbeams; the wedge opening of the wedge block faces the lower steel plate of the support.
[0009] Positive and negative threaded rods are arranged between the inner and outer steel crossbeams.
[0010] The hollow slab beam single support replacement device of this utility model has openings on both the inner and outer steel crossbeams.
[0011] One end of the positive and negative threaded rod is connected to the inner steel crossbeam, and the other end passes through the outer steel crossbeam;
[0012] The aforementioned positive and negative screws are two in number and arranged in parallel to each other;
[0013] The wedge-shaped block is located between the two positive and negative screws.
[0014] The hollow slab beam single support replacement device of this utility model has holes and slots for installing wedge blocks on the long side of both the inner and outer steel crossbeams. The number of holes and slots matches the number of wedge blocks. The wedge blocks installed on the inner and outer steel crossbeams are arranged in pairs.
[0015] The hollow slab beam single support replacement device of this utility model has a nut on the outer extension rod of the outer steel crossbeam through which the positive and negative threaded rods pass.
[0016] The hollow slab beam single support replacement device of this utility model has openings located at both ends near the outer steel crossbeam. The openings at both ends of the outer steel crossbeam are positive thread holes, which are matched with the positive thread end of the positive and negative thread screws.
[0017] The hollow slab beam single support replacement device of this utility model has openings located at both ends near the inner steel crossbeam. The openings at both ends of the inner steel crossbeam are reverse threaded holes, which are matched with the reverse threaded end of the positive and negative threaded screw.
[0018] The hollow slab beam single support replacement device of this utility model has two positive and negative threaded rods arranged between the inner and outer steel crossbeams, and the net distance between the two positive and negative threaded rods is greater than that between the steel plates under the support.
[0019] Beneficial effects
[0020] The hollow slab beam single support replacement device provided by this utility model can replace a single defective support of a hollow slab beam without lifting the bridge body. It drives the inner and outer steel crossbeams to move relative to each other through positive and negative screws, and uses wedge blocks to pry up the steel plate under the support for replacement. It can replace a single defective support of a hollow slab beam even when the reaction frame construction method is not met, and is not limited by the site environment.
[0021] The single support replacement device for hollow slab beams provided by this utility model, through theoretical analysis and calculation, laboratory simulation, and physical engineering verification, meets the design requirements and relevant acceptance evaluation standards for single support replacement of hollow slab beams.
[0022] This utility model's complete set of measuring tools is inexpensive to manufacture, easy to operate, and suitable for large-scale promotion and application. Attached Figure Description
[0023] Figure 1 This is a schematic plan view of the overall structure of this utility model;
[0024] Figure 2 This is a schematic elevation view of the overall structure of this utility model.
[0025] In the diagram: 1. Inner steel crossbeam; 2. Lower steel plate of support; 3. Wedge block; 4. Outer steel crossbeam; 5. Positive and negative threaded rod; 6. Nut. Detailed Implementation
[0026] To make the objectives and technical solutions of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0027] like Figure 1 , Figure 2 As shown:
[0028] A single support replacement device for a hollow slab beam includes an inner steel crossbeam 1, a lower steel plate 2, a wedge block 3, an outer steel crossbeam 4, positive and negative threaded rods 5, and a nut 6.
[0029] The inner steel beam 1 and the outer steel beam 4 are arranged in parallel to each other and are located on both sides of the steel plate 2 under the support.
[0030] Wedge-shaped blocks 3 are arranged opposite each other on the inner steel beam 1 and the outer steel beam 4; the wedge opening of the wedge block 3 is directly opposite the lower steel plate 2 of the support;
[0031] Positive and negative threaded rods 5 are arranged between the inner steel crossbeam 1 and the outer steel crossbeam 4.
[0032] Before construction, the on-site construction personnel used jacks to closely adhere to the beam without lifting it. After locking the jacks in place, they removed the lower pad stones and dismantled the old supports. Then, they measured and laid out the support positions, leveled the upper steel plate and the construction surface of the cap or girder, and assembled the replacement device.
[0033] Both the inner steel crossbeam 1 and the outer steel crossbeam 4 are provided with openings; one end of the positive and negative threaded rod 5 is connected to the inner steel crossbeam 1, and the other end passes through the outer steel crossbeam 4; there are two positive and negative threaded rods 5, which are arranged in parallel to each other; the wedge block 3 is located between the two positive and negative threaded rods 5.
[0034] The positive and negative threaded rod 5 passes through the outer extension of the outer steel crossbeam 4 and is equipped with a nut 6.
[0035] The inner steel beam 1 and the outer steel beam 4 have slots on one long side for installing wedge blocks 3. Two wedge blocks 3 are installed on both the inner steel beam 1 and the outer steel beam 4, facing each other. Therefore, the total number of wedge blocks 3 used in this embodiment is 4.
[0036] Based on the above structure, the assembly steps of this utility model are as follows:
[0037] First, screw the positive thread end of the two positive and negative threaded screws 5 into the threaded hole of the outer steel crossbeam 4, and then screw the negative thread end of the two positive and negative threaded screws 5 into the threaded hole of the inner steel crossbeam 1. Adjust the two positive and negative threaded screws 5 so that the inner steel crossbeam 1 and the outer steel crossbeam 4 are arranged in parallel. The four wedge blocks 3 are respectively set against the slots of the inner steel crossbeam 1 and the outer steel crossbeam 4, and each wedge block 3 is lightly spot welded to the slot of the inner steel crossbeam 1 and the outer steel crossbeam 4.
[0038] The lower steel plate 2 of the support is arranged on the four wedge blocks 3 at appropriate positions, and the front end of each wedge block 3 is inserted into the bottom of the lower steel plate 2 of the support; two positive thread nuts 6 are respectively arranged tightly on the positive thread side end of the two positive and negative threaded screws 5, and the assembly of this replacement device is completed.
[0039] The support is then placed on the lower steel plate according to the marked position, and together with this replacement device, it is placed on the leveled platform or cap beam construction surface. The next step is to install the new support. Using a torque wrench, the two outermost nuts 6 are rotated simultaneously, causing the two positive and negative threaded rods 5 to rotate synchronously. This moves both the inner steel beam 1 and the outer steel beam 4 towards the center of the support. The movement of the inner steel beam 1 and the outer steel beam 4 towards the center of the support lifts the lower steel plate 3, making the support fit tightly against the beam, thus achieving the purpose of support compression.
[0040] Once the torque wrench reaches the test value and the support is confirmed to be tightly pressed against the back pressure, rotate the two outermost nuts 6 in the opposite direction to move the inner steel beam 1 and the outer steel beam 4 in the opposite direction. Take out the inner steel beam 1, the two positive and negative threaded rods 5 and the outer steel beam 4 in sequence. Then, erect the formwork, pour the lower pad stone, and cure it to complete the replacement of the defective support of a single hollow slab beam using this device.
[0041] This implementation plan describes a method for using a single support replacement device for hollow slab beams, including the following steps:
[0042] First, before construction, the on-site construction personnel will calculate the magnitude of the support reaction force at each support according to theory, determine the model, number and arrangement of the jacks, calibrate the jacks, and level the concrete surface of the beam and the top surface of the pier at the location where the jacks are placed.
[0043] Second, lay pads on top of and below the jacks, ensuring that the jack core is aligned with the center of the steel plate during installation. Jack placement must strictly follow the positions marked on the design drawings; for insufficient space for jack placement, partially remove the protective layer of the cap beam reinforcement to increase the space.
[0044] Third, use a hand pump to pressurize and ensure that the jack is in close contact with the beam, and ensure that the beam does not rise. After the jack is in close contact with the beam, stop pressurizing immediately and lock the jack in place.
[0045] Fourth, after the beam body is tightly attached, use an electric jackhammer or core drill under load to remove the pad stone under the original support. After the old support is loosened, remove the old support and continue to remove the pad stone to facilitate the subsequent installation of the new support.
[0046] Fifth, the minimum clearance at the bottom of the beam is determined by the sum of the support height, steel plate thickness, glue leveling thickness, and minimum device height. If the clearance is insufficient, the protective layer of the cap beam needs to be removed to ensure that the minimum clearance at the bottom of the beam meets the requirements.
[0047] Sixth, determine the positions of the supports, steel plates, and pad stones according to the drawings; if the support positions are not clearly marked on the drawings, then lay out the lines based on the original embedded steel plates of the supports, and determine the center lines and positions of the supports, steel plates, and pad stones based on the distances of the original supports, steel plates, and pad stones from the edge of the cap beam and the two sides of the slab beam.
[0048] Seventh, grind and remove rust from the original embedded steel plate. If the new support is a plate rubber support, level the upper steel plate; if the new support is a PTFE sliding plate support, the mirror steel plate needs to be spot-welded to the bottom of the upper steel plate. To ensure a tight fit, a smaller steel plate should be used to press down the mirror steel plate during welding. First, weld the four corners, then spot weld at the three equal division points of the long side, and finally spot weld at the middle of the short side. After welding, grind the welded area and apply structural adhesive to the weld. Finally, apply structural adhesive to the top of the upper steel plate and use a screw rod to back-press and level the steel plate in the determined position to ensure that its horizontal deviation is no more than 0.2°.
[0049] Eighth, the construction surface of the cap beam is leveled according to the space under the beam. If the space is high, the construction surface can be leveled by pouring grouting material for the pad stone. If the space is low, the construction surface is leveled by using steel plate counter-pressure structural adhesive. The plane size is about 40×40cm, and the flatness is controlled within ±1mm.
[0050] Ninth, assemble this replacement device. Slots are cut at the fixed positions on the long sides of the inner and outer steel beams 1 and 4 to facilitate the positioning of the wedge blocks 3. Positive threaded holes are set at certain positions at both ends of the outer steel beam 4, and negative threaded holes are set at certain positions at both ends of the inner steel beam 1. First, screw the positive thread end of the two positive and negative threaded rods 5 into the threaded hole of the outer steel beam 4, and then screw the negative thread end of the two positive and negative threaded rods 5 into the threaded hole of the inner steel beam 1. Adjust the two positive and negative threaded rods 5 so that the inner and outer steel beams 1 and 4 are arranged in parallel. The four wedge blocks 3 are respectively set against the slots of the inner and outer steel beams 1 and 4, and each wedge block 3 is lightly spot-welded to the slot of the inner and outer steel beams 1 and 4. The lower steel plate 3 of the support is arranged in appropriate positions on four wedge blocks 4, and the front end of each wedge block 4 is inserted into the bottom of the lower steel plate 3 of the support; two positive thread nuts 6 are tightly arranged on the positive thread side of the two positive and negative threaded screws 5 respectively, and the assembly of this replacement device is completed.
[0051] Tenth, place the new support on the lower steel plate 2. According to the layout position, place the support and replacement device at the cap beam or platform. If the new support is a PTFE sliding plate support, clean the surface of the PTFE sliding plate first, then evenly apply silicone grease to the PTFE sliding plate. After positioning and inspection, use two torque wrenches to simultaneously rotate the two outermost nuts 6 on the left and right sides, causing the positive and negative threaded rods 5 to rotate synchronously. This causes the inner and outer steel beams 1 and 4 to push the four wedge blocks 3 towards the center of the support, lifting the lower steel plate 3 and compressing the support upwards against the beam. Compression is achieved when the torque reading rises rapidly during torque wrench rotation, with a torque of 30 N·m as a reference value. Then, use a pry bar to tap the support to confirm whether it is tightly pressed against the beam.
[0052] Eleventh, after confirming that the support is tightly pressed against the back pressure, use a torque wrench to rotate the two outermost nuts 6 in the opposite direction to make the inner and outer steel beams 1 and 4 move in the opposite direction. Take out the inner steel beam 1, the two positive and negative threaded rods 5 and the outer steel beam 4 in sequence for subsequent recycling.
[0053] Twelfth, according to the layout position, erect the formwork, pour the lower pad stone, and cure it. The height of the lower pad stone should be flush with the steel plate 3 under the support.
[0054] Thirteenth, after the replacement of a single support is completed, the elevation of the beam at the top of the pier must be kept consistent with that before the replacement.
[0055] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A single support replacement device for a hollow slab beam, characterized in that, Includes inner steel crossbeam (1), lower steel plate of support (2), wedge block (3), outer steel crossbeam (4), and positive and negative threaded rod (5); The lower steel plate (2) of the support is arranged below the hollow slab beam support and is in contact with the hollow slab beam support; The inner steel beam (1) and the outer steel beam (4) are arranged in parallel to each other and are located on both sides of the steel plate (2) under the support. Wedge-shaped blocks (3) are respectively arranged opposite to each other on the inner steel beam (1) and the outer steel beam (4); the wedge opening of the wedge-shaped block (3) is directly opposite to the lower steel plate (2) of the support; Positive and negative threaded rods (5) are arranged between the inner steel crossbeam (1) and the outer steel crossbeam (4).
2. The single-support replacement device for hollow slab beams according to claim 1, characterized in that, Both the inner steel crossbeam (1) and the outer steel crossbeam (4) are provided with openings; One end of the positive and negative screw (5) is connected to the inner steel crossbeam (1), and the other end passes through the outer steel crossbeam (4); The aforementioned positive and negative screws (5) are two in number and are arranged in parallel to each other; The wedge block (3) is located between the two positive and negative screws (5).
3. The single support replacement device for hollow slab beams according to claim 1 or 2, characterized in that, The inner steel beam (1) and the outer steel beam (4) have holes and slots on their long sides for installing wedge blocks (3), and the number of holes and slots matches the number of wedge blocks (3); the wedge blocks (3) installed on the inner steel beam (1) and the outer steel beam (4) are arranged in pairs.
4. The single support replacement device for hollow slab beams according to claim 1 or 2, characterized in that, The outer extension of the outer steel beam (4) through which the positive and negative threaded screw (5) passes is provided with a nut (6).
5. The single support replacement device for hollow slab beams according to claim 2, characterized in that, The openings are located at both ends near the outer steel crossbeam (4). The openings at both ends of the outer steel crossbeam (4) are positive thread holes that are matched with the positive thread end of the positive and negative thread screws (5).
6. The single support replacement device for hollow slab beams according to claim 2, characterized in that, The openings are located at both ends near the inner steel crossbeam (1). The openings at both ends of the inner steel crossbeam (1) are reverse thread holes, which are matched with the reverse thread end of the positive and negative thread screw (5).
7. The single support replacement device for hollow slab beams according to claim 1, characterized in that, Two positive and negative threaded rods (5) are arranged between the inner steel beam (1) and the outer steel beam (4), and the net distance between the two positive and negative threaded rods (5) is greater than that between the lower steel plate (2) of the support.