Steel beam capable of controlling hogging moment of cast-in-place continuous section at pier top of prefabricated T-beam
By designing a reinforcement mechanism in the negative bending moment steel bundle, the problem that the negative bending moment steel bundle in the prior art cannot adjust the prestress is solved, and better mechanical properties and bridge safety are achieved.
Patent Information
- Application Number
- CN202422036934.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-21
AI Technical Summary
In the prior art, the negative bending moment steel bundle cannot effectively adjust the prestress when it bears different loads, resulting in poor mechanical properties and inability to ensure the safety of the bridge.
A negative bending moment steel bundle including a straight rod, a hook section and a reinforcement mechanism is designed, and reinforcement and prestress adjustment of the straight rod and hook section is achieved by providing the first and second connecting blocks, screws and screw sleeves.
Through the design of the reinforcement mechanism, it can effectively prevent deformation of the straight rod and hook section, adjust prestress, improve the bending and shear resistance of the negative bending moment steel bundle, and ensure the load-bearing capacity and stability of the bridge.
Smart Images
Figure CN222975637U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of negative moment steel tendons, in particular to a negative moment steel tendon for controlling the cast-in-place continuous section at the pier top of precast T-beams that can be controlled. Background Technique
[0002] A T-beam is a common bridge component with a T-shaped cross-section. It is usually precast in a factory and then transported to the construction site for installation. The cast-in-place continuous section at the pier top of the beam refers to the parts of the bridge, such as the pier top, where concrete needs to be cast in place to form a continuous structure to improve the overall bearing capacity and stability. In some areas of the bridge, especially near the fulcrum, due to the action of the load, the beam body will produce a downward bend, and the moment generated by this bend is called the negative moment. The negative moment steel tendon refers to the steel cable or steel bar that bears tension in the structure, and applies pressure at the bottom or top of the beam or slab to reduce or offset the positive moment caused by the load. Therefore, at the pier top part of the precast T-beam, by casting concrete on site, this part forms a continuous beam body, and by setting negative moment steel tendons to control the stress condition of the structure, this design can optimize the bearing performance and overall stability of the structure.
[0003] In the prior art, when setting negative moment steel tendons to control and balance the bending moment generated at the cast-in-place continuous section at the pier top of precast T-beams, usually, prestressed steel tendons are arranged in the T-beams first, and the negative moment steel tendons and steel bars are tied together with iron wires, and then combined with concrete pouring to achieve offsetting the negative moment generated due to the action of the load. Since in actual use, the negative moment steel tendons may deform under force, and the prestress corresponding to the negative moment steel tendons cannot be adjusted, resulting in the negative moment steel tendons not being able to show the best mechanical properties when bearing different loads, and thus the safety of the bridge during use cannot be ensured. Therefore, to solve the above problems, a negative moment steel tendon for controlling the cast-in-place continuous section at the pier top of precast T-beams that can be controlled is proposed. Content of the Utility Model
[0004] The purpose of the utility model is to provide a negative moment steel tendon for controlling the cast-in-place continuous section at the pier top of precast T-beams, so as to solve the problem in the prior art mentioned in the above background technique that the negative moment steel tendons may deform under force, and the prestress corresponding to the negative moment steel tendons cannot be adjusted, resulting in the negative moment steel tendons not being able to show the best mechanical properties when bearing different loads, and thus the safety of the bridge during use cannot be ensured.
[0005] To achieve the above purpose, the utility model provides the following technical solution: A negative moment steel tendon for controlling the cast-in-place continuous section at the pier top of precast T-beams, including a tendon body, the tendon body includes a straight rod, and a hooked section is arranged on the surface of the straight rod;
[0006] The surface of the straight rod is provided with a reinforcement mechanism, and the reinforcement mechanism includes a first connection block. The first connection block is fixedly connected to the surface of the hook section. A second connection block is fixedly connected to the surface of the straight rod. A screw rod is movably connected inside the first connection block, and a screw sleeve is threadedly connected to the surface of the screw rod.
[0007] Preferably, two groups of the first connection blocks are fixedly connected to the hook section, and four groups of the second connection blocks are fixedly connected to the surface of the straight rod.
[0008] Preferably, the screw rod penetrates through the first connection block and the second connection block, and the first connection block and the second connection block are fixed by the screw rod and the screw sleeve.
[0009] Preferably, a clamping mechanism is provided on the surface of the straight rod. The clamping mechanism includes a movable sleeve. The movable sleeve is movably connected to the surface of the straight rod. A first fixing block is fixedly connected to the surface of the movable sleeve. A clamping ring is movably connected to the surface of the first fixing block. A second fixing block is fixedly connected to the surface of the movable sleeve, and a return spring is fixedly connected to the surface of the second fixing block.
[0010] Preferably, two groups of the first fixing blocks are fixedly connected to the movable sleeve, and the clamping ring is movably connected to the first fixing block through a rotating shaft.
[0011] Preferably, one end of the return spring is fixedly connected to the second fixing block, and the other end of the return spring is fixedly connected to the clamping ring.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] 1. Through the arrangement of the first connection block and the second connection block, the connection between the screw rod and the straight rod and the hook section can be positioned. By passing the screw rod through the first connection block and the second connection block and cooperating with the action of the screw sleeve, the locking between the first connection block and the second connection block can be realized, thereby the straight rod and the hook section can be reinforced, making the straight rod and the hook section not easily deformed, and the effect of adjusting the prestress can be achieved. Furthermore, the strength of the straight rod and the hook section is better, which can improve the bending resistance, shear resistance and other capabilities of the negative moment steel bundle, and is beneficial to ensuring the bearing capacity and stability of the cast-in-place continuous section at the pier top of the precast T-beam.
[0014] 2. Through the movement of the clamping ring and cooperating with the elastic property of the return spring, the clamping ring can clamp the steel bar. Thus, during construction, the clamping ring can initially fix the straight rod and the steel bar, making it more convenient to tie the straight rod and the steel bar with wire, facilitating better construction. At the same time, through the movement of the movable sleeve on the surface of the straight rod, the connection position between the straight rod and the steel bar can be adjusted, thereby adapting to different construction requirements. Description of the Drawings
[0015] Figure 1 is a front view structural schematic diagram of the present utility model;
[0016] Figure 2 is a front view sectional structural schematic diagram of the present utility model;
[0017] Figure 3 is the present utility model Figure 2 and is an enlarged structural schematic diagram of part A in the present utility model;
[0018] Figure 4 is a bottom view sectional structural schematic diagram of the local structure of the screw rod and the screw sleeve of the present utility model.
[0019] In the figure: 1, straight rod; 11, hooked section; 2, first connecting block; 21, second connecting block; 22, screw rod; 23, screw sleeve; 3, movable sleeve; 31, first fixing block; 32, clamping ring; 33, second fixing block; 34, return spring. Specific embodiments
[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0021] Please refer to Figures 1-4 , an embodiment provided by the present utility model:
[0022] A prestressed steel bundle for controlling the negative moment of the cast-in-place continuous section at the pier top of precast T-beams, including a tendon body. The tendon body includes a straight rod 1, and a hooked section 11 is provided on the surface of the straight rod 1. The hooked section 11 is bent. In some areas of the bridge, especially near the fulcrum, due to the action of the load, the beam body will generate a downward bend, and the moment generated by this bend is called the negative moment. By setting prestressed steel bundles in the cast-in-place continuous section at the pier top, the straight rod 1 and the hooked section 11 can generate prestress in the concrete, thereby forming a balancing force in the structure, which can offset the negative moment generated by the action of the load, realize the optimization of the bearing performance and overall stability of the structure, and further make the cast-in-place continuous section at the pier top of the precast T-beam safer;
[0023] A reinforcement mechanism is provided on the surface of the straight rod 1. The reinforcement mechanism includes a first connecting block 2, and the first connecting block 2 is fixedly connected to the surface of the hook section 11. A second connecting block 21 is fixedly connected to the surface of the straight rod 1. A screw rod 22 is movably connected to the inner side of the first connecting block 2, and a nut sleeve 23 is threadedly connected to the surface of the screw rod 22. Through the setting of the nut sleeve 23 and the action of the screw rod 22, the fixation of the first connecting block 2 and the second connecting block 21 can be achieved, and the prestress can be adjusted. Furthermore, the hook section 11 is not easily bent, and the bearing capacity and stability of the cast-in-place continuous section at the pier top of the precast T-beam can be better guaranteed.
[0024] Furthermore, two groups of the first connecting blocks 2 are fixedly connected to the hook section 11, and four groups of the second connecting blocks 21 are fixedly connected to the surface of the straight rod 1. Through the setting of the first connecting block 2 and the second connecting block 21, it is convenient to lock the first connecting block 2 and the second connecting block 21 through the screw rod 22 and the nut sleeve 23. Furthermore, the strength of the straight rod 1 and the hook section 11 can be enhanced, so that the negative moment steel bundle can better resist bending.
[0025] Furthermore, the screw rod 22 penetrates through the first connecting block 2 and the second connecting block 21, and the first connecting block 2 and the second connecting block 21 are fixed by the screw rod 22 and the nut sleeve 23. Through the setting of the first connecting block 2 and the second connecting block 21, the connection of the screw rod 22 can be positioned, so that the screw rod 22 can pass through the first connecting block 2 and the second connecting block 21 and then be locked with the nut sleeve 23.
[0026] Furthermore, a clamping mechanism is provided on the surface of the straight rod 1. The clamping mechanism includes a movable sleeve 3, and the movable sleeve 3 is movably connected to the surface of the straight rod 1. A first fixing block 31 is fixedly connected to the surface of the movable sleeve 3, a clamping ring 32 is movably connected to the surface of the first fixing block 31, a second fixing block 33 is fixedly connected to the surface of the movable sleeve 3, and a return spring 34 is fixedly connected to the surface of the second fixing block 33. Through the setting of the movable sleeve 3, when the straight rod 1 and the steel bar are fixed, the movable sleeve 3 can move on the surface of the straight rod 1, and thus it can be applicable to different scenarios.
[0027] Furthermore, two groups of the first fixing blocks 31 are fixedly connected to the movable sleeve 3, and the clamping ring 32 is movably connected to the first fixing block 31 through a rotating shaft. Through the movement of the clamping ring 32, the steel bar can enter the inner side of the clamping ring 32, and the steel bar and the straight rod 1 can be preliminarily fixed by the clamping ring 32.
[0028] Furthermore, one end of the return spring 34 is fixedly connected to the second fixing block 33, and the other end of the return spring 34 is fixedly connected to the clamping ring 32. Through the setting of the return spring 34, the clamping ring 32 can be reset, and thus the clamping ring 32 can clamp the steel bar to be tied, which is convenient for more stable tying of the straight rod 1 and the steel bar with iron wire subsequently.
[0029] Working principle: When in use, the screw rod 22 is passed through the inner side of the first connecting block 2 and the second connecting block 21, and then the screw sleeve 23 is sleeved on the surface of the screw rod 22, and the screw sleeve 23 is twisted to make the screw sleeve 23 and the surface of the second connecting block 21 abut, so that the first connecting block 2 and the second connecting block 21 can be locked by the screw rod 22 and the screw sleeve 23, thereby strengthening the straight rod 1 and the hook section 11, so that the negative bending moment steel bundle can better cope with the bending moment;
[0030] The movable sleeve 3 is moved to achieve movement on the surface of the straight rod 1, and the movable sleeve 3 can be moved to a desired position. Then, the clamping ring 32 is opened, and the clamping ring 32 is moved through the rotating shaft to increase the spacing of the clamping ring 32. At this time, the reset spring 34 is in a contracted state, and then the steel bar is placed inside the clamping ring 32. By loosening the clamping ring 32, the clamping ring 32 can be reset under the rebound action of the reset spring 34, and then the clamping ring 32 can clamp the steel bar, and the straight rod 1 and the steel bar can be initially fixed, so that the straight rod 1 and the steel bar can be better bundled with the iron wire, so that the steel bar is not easy to fall off during bundling.
[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.
Claims
1. A controllable prefabricated T-beam pier top cast-in-place continuous section negative bending moment steel tendon, comprising a tendon body, the tendon body comprising a straight rod (1), the surface of the straight rod (1) being provided with a hook section (11); It is characterized in that The surface of the straight rod (1) is provided with a reinforcement mechanism, the reinforcement mechanism comprising a first connection block (2), the first connection block (2) is fixedly connected to the surface of the hook section (11), the surface of the straight rod (1) is fixedly connected to a second connection block (21), the inner side of the first connection block (2) is movably connected to a screw rod (22), and the surface of the screw rod (22) is threadedly connected to a screw sleeve (23).
2. The controllable prefabricated T-beam pier top cast-in-place continuous section negative moment steel strand according to claim 1, characterized in that: The first connection blocks (2) are in two groups and fixedly connected to the hook section (11), and the second connection blocks (21) are in four groups and fixedly connected to the surface of the straight rod (1).
3. The controllable prefabricated T-beam pier top cast-in-place continuous section negative bending moment steel strand according to claim 1, characterized in that: The screw rod (22) passes through the first connection block (2) and the second connection block (21); the first connection block (2) and the second connection block (21) are fixed by means of the screw rod (22) and the screw sleeve (23).
4. The controllable prefabricated T-beam pier top cast-in-place continuous section negative moment steel strand according to claim 1, characterized in that: The surface of the straight rod (1) is provided with a clamping mechanism, and the clamping mechanism comprises a movable sleeve (3), the movable sleeve (3) is movably connected to the surface of the straight rod (1), the surface of the movable sleeve (3) is fixedly connected to a first fixed block (31), the surface of the first fixed block (31) is movably connected to a clamping ring (32), the surface of the movable sleeve (3) is fixedly connected to a second fixed block (33), and the surface of the second fixed block (33) is fixedly connected to a return spring (34).
5. The controllable prefabricated T-beam pier top cast-in-place continuous section negative moment steel strand according to claim 4, characterized in that: The first fixed blocks (31) are in two groups and fixedly connected to the movable sleeve (3); the clamping ring (32) is movably connected to the first fixed blocks (31) via a rotating shaft.
6. The controllable prefabricated T-beam pier top cast-in-place continuous section negative moment steel strand according to claim 4, characterized in that: One end of the return spring (34) is fixedly connected to the second fixed block (33), and the other end of the return spring (34) is fixedly connected to the clamping ring (32).