Pre-pressing concrete bridge prefabricated part for pre-tensioning method
Patent Information
- Application Number
- CN202522541301.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-29
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-29
AI Technical Summary
1、预应力传递完全依赖钢筋与混凝土的粘结应力，在钢筋放张瞬间，端部应力集中现象显著，易产生劈裂裂缝；同时，粘结力受混凝土强度、钢筋表面状态、振捣质量等多因素影响，传力长度内应力分布不均匀，预应力传递效率难以精确控制，极端情况下可能导致滑移失效
本实用新型通过两个半管与两个半环及螺杆、螺母的组装配合，形成包裹钢筋的闭合管状结构和环状结构，达到将预埋件便捷、牢固地固定于钢筋上的效果，可根据实际情况，安装在钢筋的任意位置。通过环状结构与混凝土桥梁的嵌固配合，在钢筋复位时借助两端环状结构增加对混凝土的挤压力，达到增强桥梁结构预应力的效果。通过多个本实用新型在钢筋上的数量调节与协同作用配合，达到灵活调整对混凝土桥梁整体挤压力度的效果。通过本实用新型在钢筋不同区段的分布位置优化配合，达到对混凝土桥梁预应力进行分区差异化精准调控的效果。通过倒刺主体与六边杆及定位螺钉的角度调节配合，实现倒刺主体在条形槽内的展开角度固定，达到在混凝土浇筑后强化预埋件对混凝土的锚固预应力，并根据展开角度大小调整预应力强度。
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Figure CN224901996U_ABST
Abstract
Description
Technical Field
[0001] This utility model specifically relates to a pre-tensioned steel bar embedded part for pre-stressed concrete bridges, belonging to the field of bridge construction. Background Technology
[0002] Prestressed concrete technology, as a core process in modern bridge engineering, effectively improves the crack resistance and durability of structures under service loads by pre-applying compressive stress to concrete members. Among these methods, pre-tensioning is widely used in the production of standardized components such as precast hollow slabs and T-beams due to its advantages of simple process, economic efficiency, and stable quality. The traditional pre-tensioning process involves tensioning and temporarily anchoring the prestressing tendons to a platform before pouring concrete. After the concrete has cured to the specified strength, the tendons are loosened to allow elastic recoil, and the prestress is transferred to the concrete member through the bond stress between the tendons and the concrete.
[0003] However, the traditional pre-tensioning method, which relies entirely on bond force to transfer prestress, suffers from the following technical bottlenecks. 1. Prestress transfer relies entirely on the bond stress between the steel reinforcement and the concrete. At the moment of steel reinforcement release, stress concentration at the end is significant, which can easily lead to splitting cracks. At the same time, the bond strength is affected by multiple factors such as concrete strength, steel reinforcement surface condition, and vibration quality. The stress distribution within the force transfer length is uneven, making it difficult to accurately control the prestress transfer efficiency. In extreme cases, it may lead to slip failure.
[0004] 2. For components that require local reinforcement or have complex stress states, the traditional pre-tensioning method cannot achieve differentiated control of prestress in different zones. The prestress is uniformly distributed along the longitudinal direction of the component, which is difficult to match the actual stress requirements and limits the application of the pre-tensioning method in complex structures.
[0005] Therefore, there is an urgent need for a device that can enhance the mechanical extrusion pressure on concrete during repositioning of reinforcing bars and make the extrusion pressure adjustable, based on the pre-tensioning process, in order to overcome the limitations of traditional bond force transmission. Utility Model Content
[0006] To overcome the shortcomings of existing technologies, a pre-tensioned steel reinforcement embedded part for prestressed concrete bridges is provided to solve the above problems.
[0007] A pre-tensioned steel bar embedded part for pre-stressed concrete bridges includes a sleeve, two barbs and two retaining rings. Each end of the sleeve is threaded with a retaining ring, and a barb is provided on each side of the outer wall of the sleeve. The sleeve includes two half-tubes, four half-threads, and four short screws. The two half-tubes are closed to form a closed tubular structure. Each half-tube has a half-thread at both ends. Two adjacent half-threads are closed to form a complete external thread. Each external thread is threaded to a retaining ring. Each half-tube has a through hole at both ends. A short screw is inserted into each through hole and threaded to the through hole. Each half-tube has a groove on its outer wall. A barb is provided in the groove. A connecting hexagonal hole is machined on each side of the inner wall of the groove.
[0008] As a preferred embodiment: each locking ring includes two half-rings, four side lugs, two screws and two nuts. Each half-ring has a side lug at each end, and a screw is inserted into the two side lugs on the same side. Each screw is threaded with a nut, which rests against the side lug. The two half-rings are closed to form a closed ring structure through the screws and nuts. The inner wall of each half-ring is machined with a threaded groove. The two threaded grooves are closed to form a complete connecting threaded groove, which is threaded to the external thread.
[0009] As a preferred embodiment: the barb includes a barb body, a hexagonal rod and two positioning screws. The end of the barb body is placed in a strip groove. The end of the barb body is machined with a hexagonal through hole. A hexagonal rod is inserted into the hexagonal through hole. The two ends of the hexagonal rod are respectively inserted into the corresponding connecting hexagonal holes. A threaded blind hole is machined at each end of the hexagonal rod. A positioning screw is threaded into each threaded blind hole. The positioning screw is attached to the half tube.
[0010] The beneficial effects of this utility model are as follows: This invention utilizes the assembly and cooperation of two half-tubes, two half-rings, screws, and nuts to form a closed tubular and ring-shaped structure enclosing the reinforcing steel, achieving the effect of conveniently and firmly fixing the embedded parts to the steel bars. It can be installed at any position on the steel bars according to actual conditions. Through the embedded cooperation of the ring structure with the concrete bridge, the ring structure at both ends increases the compressive force on the concrete during steel bar repositioning, thereby enhancing the prestress of the bridge structure. By adjusting the quantity and synergistic effect of multiple components of this invention on the steel bars, the overall compressive force on the concrete bridge can be flexibly adjusted. Through the optimized distribution of the reinforcing steel bars in different sections, the prestress of the concrete bridge can be precisely controlled by different zones. By adjusting the angle of the barbed body, hexagonal rod, and positioning screws, the unfolding angle of the barbed body within the strip groove is fixed, strengthening the anchoring prestress of the embedded parts to the concrete after pouring, and adjusting the prestress intensity according to the unfolding angle. Attached Figure Description
[0011] Figure 1This is a three-dimensional structural diagram of the present invention in use. Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the confinement ring; Figure 4 This is a schematic diagram of the three-dimensional structure of a semi-ring; Figure 5 This is a schematic diagram of the three-dimensional structure of the sleeve; Figure 6 This is a schematic diagram of the three-dimensional structure of a semi-tube; Figure 7 This is a schematic diagram of the three-dimensional structure of the barbs; Figure 8 This is a schematic diagram of a partial cross-sectional structure of a half-tube; Figure 9 This is a schematic diagram of the three-dimensional structure of a hexagonal rod.
[0012] In the diagram: 1-sleeve; 1-1-half-pipe; 1-11-through hole; 1-12-slot; 1-13-connecting hexagonal hole; 1-2-half-thread; 1-3-short screw; 3-barb; 3-1-barb body; 3-11-hexagonal through hole; 3-2-hexagonal rod; 3-21-threaded blind hole; 3-3-locating screw; 2-locking ring; 2-1-half-ring; 21-1-connecting threaded groove; 2-11-threaded groove; 2-2-side lug; 2-3-screw; 2-4-nut; 7-tubular structure; 6-external thread; 8-ring structure; 5-concrete bridge; 4-reinforcing bar. Detailed Implementation
[0013] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.
[0014] Specific implementation method one: Combining Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 This embodiment describes a pre-tensioned steel bar embedded part for pre-stressed concrete bridges, which includes a sleeve 1, two barbs 3 and two retaining rings 2. Each end of the sleeve 1 is threaded with a retaining ring 2, and each side of the outer wall of the sleeve 1 is provided with a barb 3. The sleeve 1 includes two half-tubes 1-1, four half-threads 1-2, and four short screws 1-3. The two half-tubes 1-1 are closed to form a closed tubular structure 7. Each half-tube 1-1 has a half-thread 1-2 at both ends. Two adjacent half-threads 1-2 are closed to form a complete external thread 6. Each external thread 6 is threaded to a retaining ring 2. Each half-tube 1-1 has a through hole 1-11 at both ends. A short screw 1-3 is inserted into each through hole 1-11 and threaded to the through hole 1-11. Each half-tube 1-1 has a strip groove 1-12 on its outer wall. A barb 3 is provided in the strip groove 1-12. A connecting hexagonal hole 1-13 is machined on the inner walls of both sides of the strip groove 1-12.
[0015] Specific Implementation Method Two: This implementation method is a further limitation of Specific Implementation Method One. Each locking ring 2 includes two half-rings 2-1, four side lugs 2-2, two screws 2-3, and two nuts 2-4. Each half-ring 2-1 has a side lug 2-2 at both ends. A screw 2-3 is inserted into the two side lugs 2-2 on the same side. A nut 2-4 is threaded onto each screw 2-3. The nuts 2-4 are attached to the side lugs 2-2. The two half-rings 2-1 are closed to form a closed ring structure 8 through the screws 2-3 and nuts 2-4. The inner wall of each half-ring 2-1 is machined with a threaded groove 2-11. The two threaded grooves 2-11 are closed to form a complete connecting threaded groove 21-1. The connecting threaded groove 21-1 is threadedly connected to the external thread 6.
[0016] Specific Implementation Method 3: This implementation method is a further limitation of Specific Implementation Method 1 or 2. The barb 3 includes a barb body 3-1, a hexagonal rod 3-2 and two positioning screws 3-3. The end of the barb body 3-1 is placed in the strip groove 1-12. The end of the barb body 3-1 is machined with a hexagonal through hole 3-11. The hexagonal rod 3-2 passes through the hexagonal through hole 3-11. The two ends of the hexagonal rod 3-2 are respectively passed through the corresponding connecting hexagonal holes 1-13. The two ends of the hexagonal rod 3-2 are respectively machined with a threaded blind hole 3-21. Each threaded blind hole 3-21 is threaded with a positioning screw 3-3. The positioning screw 3-3 is attached to the half tube 1-1.
[0017] Working principle: Before the concrete bridge 5 is poured, multiple embedded parts are symmetrically mounted and fixed to the reinforcing bars 4 as needed. First, two half-pipes 1-1 are wrapped around the reinforcing bars 4, and then two half-rings 2-1 are wrapped around one end of the tubular structure 7. The two half-rings 2-1 are then turned into a closed ring structure 8 by using screws 2-3 and nuts 2-4. The two half-pipes 1-1 are then closed to form the tubular structure 7 by connecting the threaded groove 21-1 and the external thread 6. The tubular structure 7 is compressed by the ring structure 8, so that the inner wall of the tubular structure 7 is pressed against the reinforcing bars 4, thereby achieving the purpose of fixing the embedded parts to the reinforcing bars 4.
[0018] At this time, since the ring structures 8 at both ends are embedded in the concrete bridge 5 after the concrete bridge 5 is poured and solidified, the compression force on the concrete bridge 5 is increased when the reinforcing bar 4 is reset.
[0019] The compressive force on the concrete bridge 5 can be adjusted by increasing or decreasing the number of these embedded parts on the reinforcing bars 4.
[0020] By adjusting the distribution of this embedded part on the reinforcing bar 4, the prestressing of the concrete bridge 5 can be controlled in a zoned and differentiated manner.
[0021] Before pouring concrete bridge 5, remove the two positioning screws 3-3 and take out the hexagonal rod 3-2. At this time, the barb body 3-1 in the strip groove 1-12 can be unfolded, and then the hexagonal rod 3-2 can be inserted into the connecting hexagonal hole 1-13 and the hexagonal through hole 3-11. The position of the hexagonal rod 3-2 is fixed by the positioning screws 3-3. Due to the hexagonal design, the position of the unfolding angle of the barb body 3-1 can be fixed. After the concrete bridge 5 is poured, the barb 3 can strengthen the prestress of the concrete bridge 5 by this embedded part, and the magnitude of the prestress can be adjusted by the unfolding angle of the barb body 3-1, which can reduce the number of embedded parts used.
Claims
1. A pre-tensioned steel reinforcement embedded part for prestressed concrete bridges, characterized in that: It includes a sleeve (1), two barbs (3) and two locking rings (2). Each end of the sleeve (1) is threaded with a locking ring (2), and a barb (3) is provided on each side of the outer wall of the sleeve (1). The sleeve (1) includes two half tubes (1-1), four half threads (1-2) and four short screws (1-3). The two half tubes (1-1) are closed to form a closed tubular structure (7). Each half tube (1-1) has a half thread (1-2) at both ends. Two adjacent half threads (1-2) are closed to form a complete external thread (6). Each external thread (6) is threaded to a retaining ring (2). Each half tube (1-1) has a through hole (1-11) at both ends. Each through hole (1-11) has a short screw (1-3) inserted into it. The short screw (1-3) is threaded to the through hole (1-11). Each half tube (1-1) has a strip groove (1-12) on its outer wall. A barb (3) is provided in the strip groove (1-12). A connecting hexagonal hole (1-13) is processed on the inner walls of both sides of the strip groove (1-12).
2. The embedded steel reinforcement for prestressed concrete bridges according to claim 1, characterized in that: Each confinement ring (2) includes two half-rings (2-1), four side lugs (2-2), two screws (2-3), and two nuts (2-4). Each half-ring (2-1) has a side lug (2-2) at each end. A screw (2-3) is inserted into the two side lugs (2-2) on the same side. A nut (2-4) is threaded onto each screw (2-3). The nut (2-4) is attached to the side lug (2-2). The two half-rings (2-1) are closed by the screws (2-3) and nuts (2-4) to form a closed ring structure (8). The inner wall of each half-ring (2-1) is machined with a threaded groove (2-11). The two threaded grooves (2-11) are closed to form a complete connecting threaded groove (21-1). The connecting threaded groove (21-1) is threadedly connected to the external thread (6).
3. The embedded steel reinforcement for prestressed concrete bridges according to claim 1, characterized in that: The barb (3) includes a barb body (3-1), a hexagonal rod (3-2) and two positioning screws (3-3). The end of the barb body (3-1) is placed in the strip groove (1-12). The end of the barb body (3-1) is machined with a hexagonal through hole (3-11). The hexagonal rod (3-2) is inserted into the hexagonal through hole (3-11). The two ends of the hexagonal rod (3-2) are respectively inserted into the corresponding connecting hexagonal holes (1-13). The two ends of the hexagonal rod (3-2) are respectively machined with a threaded blind hole (3-21). A positioning screw (3-3) is threaded into each threaded blind hole (3-21). The positioning screw (3-3) is attached to the half tube (1-1).