Pre-stressed reaction frame
By designing a preload reaction frame, the problem of reusing steel strands during preloading on pier brackets at different heights was solved, the length of the tensioning member was adjustable, resource waste was avoided, construction risks were reduced, and construction efficiency and safety were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TENGDA CONSTR GROUP CORP
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-03
AI Technical Summary
In existing bracket preloading methods, steel strands are difficult to reuse when preloading bridge pier brackets at different heights, resulting in resource waste.
The prestressing reaction frame is adopted, including fixing components, prestressing distribution beams, tensioning components and loading units. The tensioning components are modularly spliced to achieve adjustable length, which can adapt to the prestressing requirements of bridge pier brackets of different heights.
This enables the reuse of tensioning components, avoids resource waste, reduces construction risks, and improves construction efficiency and safety.
Smart Images
Figure CN224451414U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge engineering technology, and in particular to a preload reaction frame. Background Technology
[0002] In bridge engineering, block 0 typically refers to the first cast-in-place beam segment at the top of the pier, serving as the benchmark segment for cantilever construction of long-span continuous beams. Block 0 casting usually involves setting up a support platform on the pier, with casting templates on the platform. Cantilever construction requires a formwork hanging basket on block 0, with cantilever casting templates mounted on the basket. To verify the load-bearing capacity of the support or formwork, eliminate inelastic deformation, and reduce construction risks, pre-stressing is usually necessary. Traditional pre-stressing methods typically involve placing sandbags or water containers on the support or formwork to simulate its load-bearing conditions. However, these methods often lead to uneven load distribution, difficulty in dynamically adjusting the load, and higher safety risks.
[0003] A method for preloading a bracket is disclosed in related technologies. This method employs a reverse tensioning approach with steel strands. The preloading system consists of a preloading distribution beam, a pre-embedded anchoring device in the bearing platform, steel strands, and tension jacks. The preloading distribution beam is mounted on the longitudinal beam of the bracket. Both ends of the steel strands are fixedly connected to the pre-embedded anchoring device in the bearing platform and the preloading distribution beam, respectively. The preloading distribution beam is equipped with tension anchors and wedges for anchoring the steel strands. The tension jacks tension the steel strands, and the taut steel strands generate downward pressure, which is transmitted to the bracket through the distribution beam.
[0004] However, the required length of steel strands varies when preloading pier brackets at different heights, making it difficult to reuse the steel strands in the above-mentioned bracket preloading method, thus resulting in resource waste. Utility Model Content
[0005] The purpose of this utility model is to provide a preload reaction frame to solve the technical problem that steel strands in the existing bracket preload reaction system are difficult to reuse when preloading bridge pier brackets at different heights.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A preload reaction frame is used to preload the support platform installed on the bridge pier, and includes:
[0008] A fastener is provided on the support platform below the support platform;
[0009] A preload distribution beam is provided on the upper surface of the support platform, and tension anchors are provided on the preload distribution beam;
[0010] The tensioning member has a first end connected to the fixing member and a second end connected to the preload distribution beam through the tensioning anchor and at least partially extending out of the tensioning anchor. The tensioning member can be length-adjustable through modular splicing.
[0011] A loading unit, the output end of which is connected to the portion of the tensioning member that extends out of the tensioning anchor and provides tension force to the tensioning member.
[0012] Optionally, the tensioning member includes multiple finely rolled threaded steel bars, and the ends of two adjacent finely rolled threaded steel bars can be detachably connected.
[0013] Optionally, the first end of the precision-rolled threaded steel bar is an external threaded connection part, and the second end of the precision-rolled threaded steel bar is an internal threaded connection groove. The external threaded connection part of one precision-rolled threaded steel bar can be screwed into the internal threaded connection groove of another precision-rolled threaded steel bar.
[0014] Optionally, the fixing component includes a base, a limiting component, and a U-shaped connector. The base is anchored to the support platform and has an upward-opening receiving cavity. The limiting component is horizontally fixed in the receiving cavity, and the lower end face of the limiting component is an arc surface. The limiting component and the receiving cavity form a limiting space. The U-shaped connector is disposed in the limiting space, and both ends of the U-shaped connector are connected to the precision-rolled threaded steel.
[0015] Optionally, one end of the fine-rolled threaded steel connected to the U-shaped connector is a rotating shaft connector, and a roller rotating shaft orientation adjustment adapter is hinged on the rotating shaft connector.
[0016] Optionally, the lower end of the roller shaft orientation adjustment adapter is connected to an internal threaded connecting sleeve, and both ends of the U-shaped connector are configured as external threaded connectors, wherein the internal threaded connecting sleeve can be screwed into the external threaded connector.
[0017] Optionally, multiple fasteners are provided on the bearing platform, and the number of tensioning anchors provided on the preload distribution beam is the same as the number of fasteners, and the positions of the multiple fasteners in the vertical direction correspond one-to-one with the positions of the multiple tensioning anchors in the vertical direction.
[0018] Optionally, the loading unit is a tensioning jack, which is disposed on the upper surface of the bridge pier.
[0019] Optionally, the tensioning anchor includes a clamp, which is fixedly connected to the preload distribution beam.
[0020] Optionally, the preload distribution beam is an I-beam.
[0021] The beneficial effects of this utility model are:
[0022] This invention provides a preload reaction frame for preloading a support platform on a bridge pier. It includes a fixing component, a preload distribution beam, a tensioning component, and a loading unit. After the two ends of the tensioning component are connected to the fixing component and the preload distribution beam respectively, the loading unit is activated to provide tension force to the tensioning component, causing it to gradually tighten. The tightened tensioning component has a tension force towards the fixing component, which is transmitted to the support platform through the preload distribution beam, forming preload on the support platform. This simulates the load-bearing conditions of the support platform, verifies its load-bearing capacity, eliminates inelastic deformation, and reduces construction risks. The tensioning component can be modularly spliced to achieve adjustable length. When preloading support platforms on piers of different heights, the preload reaction frame can adjust the length of the tensioning component according to the height of the support platform, allowing the tensioning component to be reused and avoiding resource waste. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the cross-sectional structure of the preload reaction frame described in this embodiment of the utility model during preload.
[0024] Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle;
[0025] Figure 3 yes Figure 1 A magnified structural diagram of part B.
[0026] In the picture:
[0027] 1. Fixing component; 11. Base; 111. Receiving cavity; 12. Limiting component; 13. U-shaped connector; 131. External threaded connector; 2. Preload distribution beam; 21. Tensioning anchor; 3. Tensioning component; 31. Precision rolled threaded steel; 32. Rotary shaft connector; 33. Roller rotary shaft orientation adjustment adapter; 34. Internal threaded connecting sleeve; 4. Loading unit; 100. Pier; 200. Support platform; 300. Foundation. Detailed Implementation
[0028] The embodiments of this utility model 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 parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or 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 utility model according to the specific circumstances.
[0030] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0032] like Figures 1-3 As shown, this utility model provides a preload reaction frame for preloading a support platform 200 mounted on a bridge pier 100. It includes a fixing member 1, a preload distribution beam 2, a tensioning member 3, and a loading unit 4. The fixing member 1 is located on the pier cap 300 below the support platform 200. The preload distribution beam 2 is located on the upper surface of the support platform 200, and a tensioning anchor 21 is mounted on the preload distribution beam 2. The first end of the tensioning member 3 is connected to the fixing member 1, and the second end is connected to the preload distribution beam 2 via the tensioning anchor 21, extending at least partially beyond the tensioning anchor 21. The tensioning member 3 can be modularly spliced to achieve adjustable length. The output end of the loading unit 4 is connected to the portion of the tensioning member 3 extending beyond the tensioning anchor 21 and provides tension to the tensioning member 3.
[0033] After the two ends of the tension member 3 are connected to the fixing member 1 and the preload distribution beam 2 respectively, the loading unit 4 is activated to provide tension force to the tension member 3, causing the tension member 3 to gradually tighten. The tensioned tension member 3 has a tension force in the direction of the fixing member 1. The tension force is transmitted to the support platform 200 through the preload distribution beam 2, forming preload on the support platform 200, simulating the load-bearing conditions of the support platform 200, verifying the bearing capacity of the support platform 200, eliminating the inelastic deformation of the support platform 200, and reducing construction risks. The tension member 3 can be modularly spliced to achieve adjustable length. When preloading the support platform 200 on the piers 100 at different heights, the preload reaction frame can adjust the length of the tension member 3 according to the different heights of the support platform 200, so that the tension member 3 of the preload reaction frame can be reused to avoid resource waste.
[0034] In this embodiment, as Figure 1 and Figure 2 As shown, the tensioning member 3 includes multiple finely rolled threaded steel bars 31, and the ends of adjacent finely rolled threaded steel bars 31 can be detachably connected. The finely rolled threaded steel bars 31 are more rigid than steel strands and can be reused. The detachable connection between the ends of adjacent finely rolled threaded steel bars 31 facilitates modular splicing of the tensioning member 3 by technicians, thereby enabling length adjustment of the tensioning member 3.
[0035] Specifically, the first end of the precision-rolled threaded steel bar 31 is an external threaded connection part, and the second end of the precision-rolled threaded steel bar 31 is an internal threaded connection groove. The external threaded connection part of one precision-rolled threaded steel bar 31 can be screwed into the internal threaded connection groove of another precision-rolled threaded steel bar 31. The ends of the two precision-rolled threaded steel bars 31 are connected by screwing, which further reduces the splicing difficulty of the tensioning member 3 and ensures the connection strength between the two precision-rolled threaded steel bars 31. The ends of two adjacent precision-rolled threaded steel bars 31 can also be connected by threaded sleeves, flange bolts, or splicing plates, which are not specifically limited here.
[0036] Optionally, such as Figure 1 and Figure 2As shown, the fixing component 1 includes a base 11, a limiting component 12, and a U-shaped connector 13. The base 11 is anchored to the bearing platform 300. The base 11 has an upward-opening receiving cavity 111. The limiting component 12 is horizontally fixed in the receiving cavity 111, and the lower end surface of the limiting component 12 is an arc surface. The limiting component 12 and the receiving cavity 111 form a limiting space. The U-shaped connector 13 is disposed in the limiting space, and both ends of the U-shaped connector 13 are connected to precision-rolled threaded steel bars 31. During the gradual tensioning of the tensioning component 3, the U-shaped connector 13 can abut against the lower end surface of the limiting component 12. Since the lower end surface of the limiting component 12 is an arc surface, when the preload distribution beam 2 tilts due to the tensioning force, the tensioning component 3 can rotate around the center of the arc surface to change its orientation, thereby keeping the force direction of the tensioning component 3 perpendicular to the plane where the preload distribution beam 2 is located, and avoiding deformation of the tensioning component 3 due to the tilting pressure of the preload distribution beam 2.
[0037] Furthermore, such as Figure 2 As shown, one end of the threaded steel bar 31 connected to the U-shaped connector 13 is a rotating shaft connector 32. The length direction of the rotating shaft connector 32 is perpendicular to the length direction of the threaded steel bar 31. A roller rotating shaft orientation adjustment adapter 33 is hinged on the rotating shaft connector 32. By setting the rotating shaft connector 32 between one end of the threaded steel bar 31 and the U-shaped connector 13, the threaded steel bar 31 can rotate relative to the U-shaped connector 13 about the axial direction of the rotating shaft connector 32. By hinged the roller rotating shaft orientation adjustment adapter 33 on the rotating shaft connector 32, the threaded steel bar 31 can rotate about its own axial direction. The above structure improves the flexibility of the tensioning member 3 and can further prevent the tensioning member 3 from deforming when subjected to the inclined pressure of the preload distribution beam 2.
[0038] Furthermore, such as Figure 2 As shown, the lower end of the roller shaft orientation adjustment adapter 33 is connected to an internally threaded connecting sleeve 34, and both ends of the U-shaped connector 13 are configured as externally threaded connectors 131. The internally threaded connecting sleeve 34 can be screwed into the externally threaded connectors 131. The screw connection between the roller shaft orientation adjustment adapter 33 and the U-shaped connector 13 facilitates the installation and disassembly of the precision-rolled threaded steel bar 31 and the U-shaped connector 13 by technicians, and also ensures the connection strength between the precision-rolled threaded steel bar 31 and the U-shaped connector 13.
[0039] Optionally, multiple fasteners 1 are provided on the pier cap 300, and the number of tension anchors 21 on the preload distribution beam 2 is the same as the number of fasteners 1, with the vertical positions of the multiple fasteners 1 corresponding one-to-one with the vertical positions of the multiple tension anchors 21. By setting multiple fasteners 1 and multiple tension anchors 21, each fastener 1 and tension anchor 21 is connected to a tension member 3. The loading unit 4 can simultaneously provide tension to multiple tension members 3, allowing the preload reaction frame to simultaneously preload multiple positions of the support platform 200, and to simulate multiple working conditions of the support platform 200 under load.
[0040] Specifically, loading unit 4 is a tensioning jack, which is installed on the upper surface of pier 100. The tensioning jack has a compact structure, operates smoothly during tensioning, has a large tensioning force, and its force value is adjustable, allowing for precise adjustment of the load simulation conditions of the support platform 200. In this embodiment, the tensioning jack is an intelligent tensioning jack, which facilitates the adjustment of the tensioning force value by technicians.
[0041] Optionally, the tensioning anchor 21 includes a wedge, which is fixedly connected to the preload distribution beam 2. As the core component of the tensioning anchor 21, the wedge has a high anchoring efficiency coefficient and self-anchoring performance during tensioning, and can provide a good anchoring effect for the tensioned member 3, especially the precision-rolled threaded steel bar 31.
[0042] Specifically, the prestressing distribution beam 2 is an I-beam. I-beams have good resistance to deformation and can maintain their original shape and effectively transfer the tension to the support platform 200 when subjected to the tensioning force of the tensioning member 3.
[0043] In this embodiment, the pier 100 includes a main beam web. Multiple reinforcing metal frames are spaced apart on opposite sides of the main beam web. The support platform 200 is a triangular bracket support. A threaded steel bar for pre-embedded fixing of the triangular bracket is screwed onto the mounting base of the triangular bracket. After the threaded steel bar is fitted onto the reinforcing metal frame, concrete is poured onto the outer surface of the main beam web, embedding the triangular bracket support within the pier 100. This fixing method reduces high-altitude welding work during the installation of the triangular bracket support, lowering construction difficulty and installation risk. A shear box is also fitted onto the threaded steel bar for pre-embedded fixing of the triangular bracket. When the triangular bracket support needs to be disassembled after use, the shear box is used to cut the threaded steel bar, allowing the triangular bracket support to be removed from the pier 100. When the triangular bracket needs to be installed on the new pier 100, the new triangular bracket pre-embedded fixing threaded steel is screwed onto the mounting seat of the triangular bracket, and then installed on the metal frame for reinforcing the web of the main beam of the pier in the same way. This makes the installation and disassembly of the triangular bracket convenient and reusable, further improving the construction efficiency.
[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A pre-compression reaction frame for pre-compression of a support platform (200) provided on a bridge pier (100), characterized in that, include: A fastener (1) is provided on a support platform (300) below the support platform (200); A preload distribution beam (2) is provided on the upper end face of the support platform (200), and a tensioning anchor (21) is provided on the preload distribution beam (2); The tensioning member (3) has a first end connected to the fixing member (1) and a second end connected to the preload distribution beam (2) through the tensioning anchor (21) and at least partially protruding from the tensioning anchor (21). The tensioning member (3) can be length-adjustable through modular splicing. The loading unit (4) has its output end connected to the part of the tensioning member (3) that extends out of the tensioning anchor (21) and provides tension to the tensioning member (3).
2. The pre-press reaction frame of claim 1, wherein, The tensioning member (3) includes multiple fine-rolled threaded steel bars (31), and the ends of two adjacent fine-rolled threaded steel bars (31) can be detachably connected.
3. The preload reaction frame according to claim 2, characterized in that, The first end of the fine-rolled threaded steel bar (31) is an external threaded connection part, and the second end of the fine-rolled threaded steel bar (31) is an internal threaded connection groove. The external threaded connection part of one fine-rolled threaded steel bar (31) can be screwed into the internal threaded connection groove of another fine-rolled threaded steel bar (31).
4. The pre-load reaction rack of claim 2, wherein, The fixing component (1) includes a base (11), a limiting component (12), and a U-shaped connector (13). The base (11) is anchored to the support platform (300). The base (11) has an upward-opening receiving cavity (111). The limiting component (12) is horizontally fixed in the receiving cavity (111). The lower end face of the limiting component (12) is an arc surface. The limiting component (12) and the receiving cavity (111) form a limiting space. The U-shaped connector (13) is disposed in the limiting space. Both ends of the U-shaped connector (13) are connected to the precision rolled threaded steel bar (31).
5. The pre-press reaction frame of claim 4, wherein, One end of the fine-rolled threaded steel bar (31) connected to the U-shaped connector (13) is a rotating shaft connector (32), and a roller rotating shaft orientation adjustment adapter (33) is hinged on the rotating shaft connector (32).
6. The pre-load reaction rack of claim 5, wherein, The lower end of the roller shaft orientation adjustment adapter (33) is connected to an internal threaded connecting sleeve (34), and both ends of the U-shaped connector (13) are configured as external threaded connectors (131). The internal threaded connecting sleeve (34) can be screwed into the external threaded connector (131).
7. The pre-loaded reaction rack of claim 1, wherein, Multiple fasteners (1) are provided on the bearing platform (300). The number of tension anchors (21) provided on the preload distribution beam (2) is the same as the number of fasteners (1). The positions of the multiple fasteners (1) in the vertical direction correspond one-to-one with the positions of the multiple tension anchors (21) in the vertical direction.
8. The pre-loaded reaction frame of any of claims 1-7, wherein, The loading unit (4) is a tensioning jack, which is installed on the upper surface of the pier (100).
9. The pre-loaded reaction frame of any of claims 1-7, wherein, The tensioning anchor (21) includes a clamp, which is fixedly connected to the preload distribution beam (2).
10. The pre-press reaction frame according to any one of claims 1-7, wherein, The preload distribution beam (2) is an I-beam.