Prestressed concrete connecting piece

Abstract

The invention discloses a prestressed concrete connecting piece, and belongs to the technical field of concrete reinforcing pieces. The connecting structure at least comprises a first connecting piece, a locking piece and a second connecting piece, one end of the first connecting piece is in threaded connection with a threaded head, the threaded head is stably connected with one reinforcing steel bar, the locking piece is arranged in the first connecting piece and arranged outside the other reinforcing steel bar in a clamping and sleeving mode, and the second connecting piece is in threaded connection with the first connecting piece. A first gasket and a second gasket are further assembled in the first connecting piece, the inner wall of the first connecting piece, the first gasket and the outer wall of the threaded head cooperate to form a first grouting gap, the inner wall of the first connecting piece, the second gasket and the outer wall of the locking piece form a second grouting gap, and the second gasket and an inner cavity of the locking piece define a third grouting gap. When concrete is poured, the three grouting gaps can be smoothly filled with slurry, the integrated connection strength of the two steel bars and the connecting piece is remarkably enhanced, and the requirement of a prestressed concrete structure for connection stability is fully met.

Description

Technical Field

[0001] This invention relates to the field of concrete reinforcement technology, and more specifically to a prestressed concrete connector. Background Technology

[0002] In reinforced concrete structures, reliable connections between reinforcing bars rely on concrete connectors for load transfer. Traditional concrete connectors transfer stress solely through the bond or mechanical interlocking between the reinforcing bars and concrete, making them highly susceptible to cracking in the tension zone. In contrast, prestressed concrete connectors actively counteract tensile stress through prestressing, overcoming the inherent weakness of low tensile strength in concrete from a design perspective. This significantly improves the reliability and durability of the connection joints, leading to their widespread application in the construction engineering field.

[0003] Existing prestressed concrete connectors typically use two methods to fix reinforcing bars: first, fixing one reinforcing bar to the sleeve component via a threaded connection; second, using a clamping plate built into the sleeve, which deforms to fix another reinforcing bar. This dual-fastening method has significant drawbacks: firstly, the stability of threaded connections depends on friction, and during transportation and installation, vibrations can easily cause loosening or even detachment, severely weakening the fixing effect; secondly, the contact between the clamping plate and the reinforcing bar is mostly line or point contact, which can generate instantaneous concentrated stress when the reinforcing bar is under tension, easily leading to deformation or even damage of the clamping plate, thus affecting the reliability of the reinforcing bar's fixation.

[0004] The two types of problems mentioned above directly reduce the tightness between the steel bars and the connectors, ultimately deteriorating the prestressing effect of the prestressed concrete connectors. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the present invention aims to provide a prestressed concrete connector to solve the problem that the tightness of the connector and reinforcing steel is easily affected in the prior art, leading to a deterioration in the prestressing effect.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a prestressed concrete connector, comprising: a first connector, one end of which is threadedly connected to a threaded head, the threaded head being fixed to one of the reinforcing bars; a locking member, which is disposed inside the first connector and snap-fitted onto the outside of another reinforcing bar; and a second connector, which is threadedly connected to the first connector; wherein, the first connector further comprises a first gasket and a second gasket, the inner wall of the first connector, the first gasket, and the outer wall of the threaded head forming a first grouting gap, the inner wall of the first connector, the second gasket, and the outer wall of the locking member forming a second grouting gap, and the second gasket and the inner cavity of the locking member forming a third grouting gap.

[0007] Optionally, the first connector has a wide end and a narrow end. The inner wall of the wide end has a thread and is threaded to the threaded head. The outer wall of the narrow end has a thread and is threaded to the second connector. The first connector also has a plurality of first through holes and a plurality of second through holes. The first through holes are located near the wide end, and the second through holes are located near the narrow end.

[0008] Optionally, the locking member has a first inclined surface away from the first gasket, and the locking member has a plurality of third through holes that cooperate with the first through hole. The locking member also has a plurality of locking seams, one end of which extends into the third through hole and the other end extends from the first inclined surface to the opening of the locking member, thereby dividing the locking member into a plurality of locking pieces.

[0009] Optionally, the inner wall of the locking member is provided with a plurality of locking grooves. When the locking piece tightly abuts against the reinforcing bar, the locking grooves engage with the protrusions of the reinforcing bar. Optionally, the first gasket and the second gasket are respectively provided with a first groove and a second groove, and a flexible sealing element is fixed in both the first groove and the second groove. The first gasket is fixed to the end of the locking member away from the first inclined surface, and the first gasket and the second gasket are connected by an elastic element.

[0010] Optionally, the first connector is provided with a limiting groove to restrict the displacement of the first gasket, and the side of the first connector near the narrow end is provided with a second inclined surface that matches the first inclined surface.

[0011] Optionally, the threaded head has a boss, a first gap is provided between the boss and the end face of the first connector, a second gap is provided between the end face of the first connector and the end face of the second connector, and two interlocking locking toothed rings are provided in both the first gap and the second gap.

[0012] Optionally, the locking toothed ring includes a main ring body, on which a plurality of circumferentially distributed and inclined meshing teeth are fixed.

[0013] Optionally, within the first gap, one of the main ring bodies is fixed to the end face of the first connector, and the other main ring body is fixed to the threaded head; within the second gap, one of the main ring bodies is fixed to the end face of the first connector, and the other main ring body is fixed to the end face of the second connector.

[0014] Optionally, the elastic element is a cylindrical spring or a disc spring.

[0015] The beneficial effects of this invention are as follows: This invention features a first grouting gap, a second grouting gap, and a third grouting gap. During grouting, concrete grout penetrates and fills these three gaps, respectively filling the spaces between the reinforcing bar and the first connector, the locking member and the first connector, and the locking member and the reinforcing bar. After the grout solidifies, not only is a tight fit achieved between the components, but the adhesive effect of the grout and the gap-filling effect also securely lock the reinforcing bar inside the connector, completing a reliable fixation. This design, through multi-gap synergistic grouting, significantly enhances the integrated connection strength between the two reinforcing bars and the connector, fully meeting the core requirements of prestressed concrete structures for connection stability.

[0016] Meanwhile, the present invention provides a first gap between the boss and the end face of the first connector, and a second gap between the end faces of the first connector and the second connector. Two interlocking toothed rings are disposed within each of the first and second gaps. During the tightening process of the reinforcing bar, both the reinforcing bar and the second connector move towards the end face of the first connector, exerting a squeezing effect on the first and second gaps, causing the two locking toothed rings to gradually approach and engage. Through the meshing action and moderate deformation of the teeth on the locking toothed rings, an effective anti-loosening limiting structure is formed, which can suppress the relative displacement and loosening of the connection parts, achieving a stable connection between the reinforcing bar, the first connector, and the second connector, further meeting the stringent requirements for connection stability in prestressed concrete structures.

[0017] Furthermore, this invention features several locking grooves on the inner wall of the locking component. These grooves precisely fit and engage with the protrusions of the reinforcing bars, forming a mechanical interlocking structure. This interlocking design further enhances the locking effect between the locking component and the reinforcing bars, effectively dispersing the stress generated when the reinforcing bars are under tension, preventing stress concentration from damaging the connection. Simultaneously, it effectively limits the axial displacement of the reinforcing bars, ensuring that they will not dislodge from the locking component under excessive stress, thus further guaranteeing the stability of the prestressed concrete structure connection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of a prestressed concrete connector according to the present invention.

[0020] Figure 2This is a front sectional view of a prestressed concrete connector according to the present invention.

[0021] Figure 3 This is a perspective view of the first connector of a prestressed concrete connector according to the present invention.

[0022] Figure 4 This is a perspective view of the locking component of a prestressed concrete connector according to the present invention.

[0023] Figure 5 This invention relates to a prestressed concrete connector. Figure 2 Enlarged view of point A in the middle.

[0024] Figure 6 This is a three-dimensional view of the reinforcing steel bars in a prestressed concrete connector according to the present invention.

[0025] Figure 7 This is a perspective view of the second connector of a prestressed concrete connector according to the present invention.

[0026] Figure 8 This is a perspective view of a locking toothed ring for a prestressed concrete connector according to the present invention.

[0027] Figure 9 This is a schematic diagram of the locking of the locking toothed ring of a prestressed concrete connector according to the present invention.

[0028] Figure 10 This invention relates to a prestressed concrete connector. Figure 9 Enlarged view of point B in the middle.

[0029] Explanation of reference numerals in the attached figures: 1. Reinforcing bar; 11. Threaded head; 12. Boss; 2. First connector; 21. Wide end; 22. Narrow end; 23. First through hole; 24. Second through hole; 25. Second inclined surface; 26. Limiting groove; 3. Second connector; 4. Locking element; 41. Locking seam; 42. Third through hole; 43. First inclined surface; 44. Locking groove; 5. First gasket; 51. First groove; 6. Second gasket; 61. Second groove; 7. Flexible seal; 8. Elastic element; 9. Locking toothed ring; 91. Main ring body; 92. Gear. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] As mentioned earlier, existing prestressed concrete connectors typically use two different methods to connect and fix reinforcing bars. One connector uses a threaded connection at one end of a sleeve to fix one reinforcing bar. Inside the sleeve, a clamping piece is installed; the clamping piece deforms within the sleeve to clamp the other reinforcing bar, thus achieving the connection and fixation of the two bars. After the connection and fixation are complete, the operator places the reinforcing bars and connector together into a concrete mold for grouting. After the grout solidifies, a sealed cavity is formed inside the connector, and prestress is applied by stretching the reinforcing bars, thereby achieving the desired effect.

[0032] This fixing method has significant drawbacks: Firstly, the stability of threaded connections relies on friction. During transportation and installation, components are prone to loosening or even falling off due to vibration, severely weakening the fixing effect. Secondly, the contact between the clamping piece and the reinforcing bar is mostly line or point contact. When the reinforcing bar is under tension, instantaneous concentrated stress is generated, which can easily lead to deformation or even damage of the clamping piece, thus affecting the fixing reliability of the reinforcing bar. Once the reinforcing bar loosens, the prestress applied by the connector will be degraded, ultimately affecting its performance.

[0033] To address this issue, the present invention provides a prestressed concrete connector. This connector features holes in its body, creating grouting gaps during the connection process between the connector and the reinforcing steel. This allows the injected grout to fill these gaps, achieving a more stable lock and ensuring stable application of prestress. The present invention achieves this process through the following method.

[0034] Example 1: Please refer to the accompanying drawings in the specification. This first embodiment provides a prestressed concrete connector, which includes, as shown in the attached drawings... Figures 1 to 3 The first connecting member 2 is shown. The first connecting member 2 has a through-tube cylindrical structure, with a wide end 21 on one side and a narrow end 22 on the other side. A thread is provided on the inner wall of the first connecting member 2 at the wide end 21, through which a threaded head 11 is connected. The threaded head 11 is fixed to the reinforcing bar 1 by welding (e.g., ...). Figure 6 As shown), a connection is formed; a thread is provided on the outer cylinder wall of the first connector 2 at the narrow end 22, and the second connector 3 is connected through this thread (as shown). Figure 7 (As shown).

[0035] In this first embodiment, as Figure 2 , Figures 4 to 6As shown, the first connecting member 2 has a locking member 4 inside, which is also a through-tube shape with a first inclined surface 43 on one side. Several evenly distributed third through holes 42 are formed on the outer periphery of the locking member 4. Several locking slots 41 are also formed on the locking member 4. One end of the locking slot 41 extends into the third through hole 42, and the other end extends along the first inclined surface 43 until it cuts through the entire first inclined surface 43, thus dividing the locking member 4 into several locking pieces. These locking pieces are close to each other when not under force. During use, these locking pieces deform and move away from each other, allowing the reinforcing bar 1 to be smoothly inserted into the locking member 4, thereby fixing one of the reinforcing bars 1 (for ease of description, the reinforcing bar 1 threadedly connected to the first connecting member 2 is referred to as reinforcing bar A 1, and the reinforcing bar 1 locked in the locking member 4 is referred to as reinforcing bar B 1; however, these two reinforcing bars 1 are identical, and the different names are only for differentiation, therefore, they should not be interpreted as limitations on the present invention).

[0036] In this first embodiment, as Figure 2 , Figures 4 to 6 As shown, a first gasket 5 is fixed to the side of the locking member 4 away from the first inclined surface 43 by welding. An annular first groove 51 is formed on the outer periphery of the first gasket 5. A flexible sealing element 7 (e.g., a silicone sealing gasket) is fixed inside the first groove 51 by adhesive bonding. An elastic element 8 (e.g., a cylindrical spring or disc spring) is fixed to the side of the first gasket 5 away from the locking member 4 by welding. A second gasket 6 is fixed to the other end of the elastic element 8 by welding. An annular second groove 61 is formed on the outer periphery of the second gasket 6. A flexible sealing element 7 is also fixed inside the second groove 61 by adhesive bonding. Both the first gasket 5 and the second gasket 6 are disposed within the first connecting member 2, with the second gasket 6 facing the wide end 21 and the first gasket 5 facing the narrow end 22. Both the first gasket 5 and the second gasket 6 are tightly fitted against the inner wall of the first connecting member 2, achieving isolation and sealing. In use, the A-reinforcing bar 1 is threadedly connected to the wide end 21 of the first connecting member 2 via a threaded head 11. As the screw is turned deeper, the threaded head 11 gradually contacts the second washer 6 and forms abutment against the second washer 6 (before this, the locking member 4 has already formed a snap-fit ​​fixation on the B steel bar 1, and the position of the locking member 4 within the first connecting member 2 has also been fixed). By continuously applying pressure to the second washer 6, the second washer 6 is displaced relative to the first washer 5, thereby causing the elastic member 8 to deform. Its deformation force is then applied in the opposite direction to the A steel bar 1, thereby forming prestress.

[0037] In this first embodiment, as Figure 2 , Figure 5As shown, a second inclined surface 25 is formed inside the first connector 2 near the narrow end 22. This second inclined surface 25 is adapted to the shape of the locking member 4 and the first inclined surface 43. When the locking member 4 enters the first connector 2 from the wide end 21, the first inclined surface 43 slides on the inner wall of the first connector 2 until it contacts the second inclined surface 25. As the locking member 4 continues to move, the second inclined surface 25 compresses the first inclined surface 43, forcing the locking pieces to deform and move closer together, continuously locking into the B rebar 1, thereby fixing the B rebar 1. At the same time, a limiting groove 26 is also formed inside the first connector 2. The diameter of the limiting groove 26 is larger than the diameter of the locking member 4 but smaller than the diameter of the first washer 5. Therefore, when the first washer 5 abuts in the limiting groove 26, the locking member 4 completes its maximum displacement.

[0038] In this first embodiment, as Figures 1 to 5 As shown, a first through hole 23 is opened on the cylindrical wall of the first connector 2 near the narrow end 22. The first through hole 23 is positioned corresponding to the third through hole 42. When the locking member 4 moves, the first through hole 23 overlaps with the third through hole 42 in whole or in part. At the same time, a second through hole 24 is opened on the cylindrical wall of the first connector 2 near the wide end 21. The second through hole 24 is positioned corresponding to the threaded head 11. After the A rebar 1 is fixed, the second through hole 24 corresponds to the thread of the threaded head 11. Meanwhile, a structural gap is provided between the threaded head 11 of the A rebar 1 and the cylindrical wall of the first connector 2. The structural gap is larger than the maximum particle size of the slurry (for example, if the maximum particle size of the slurry is 0.5-1 mm, then the structural gap must be ≥1.2-1.5 mm), but smaller than 1 / 2 of the thread profile height (i.e., the engagement depth of the thread profile is not less than 1 / 2 of the profile height), or the structural gap does not exceed 0.5% of the nominal thread diameter; the number of threads on the first connector 2 and the thread head 11 is greater than the minimum number of threads required for conventional threaded connections to prevent slippage (for example, 3 threads), which ensures that the first connector 2 maintains a certain gap with the thread head 11 without slipping. The thread head 11 also has a guide groove on its thread side (not shown in the figure).

[0039] Meanwhile, there is also a structural gap between the outer wall of the locking member 4 and the inner wall of the first connecting member 2. After assembly, the inner wall of the first connecting member 2, the first gasket 5, and the outer wall of the threaded head 11 (of the A steel bar 1) combine to form a first grouting gap, the inner wall of the first connecting member 2, the second gasket 6, and the outer wall of the locking member 4 combine to form a second grouting gap, and the second gasket 6 and the inner cavity of the locking member 4 combine to form a third grouting gap.

[0040] Therefore, in the specific implementation of this embodiment, the user first inserts the B rebar 1 into the locking member 4, and then puts the first connector 2 on the B rebar 1 (entering from the wide end 21 and exiting from the narrow end 22) until the first connector 2 is fitted outside the locking member 4 and the second washer 6. Then, the threaded head 11 of the A rebar 1 is screwed into the wide end 21 and abuts against the second washer 6 until the locking member 4 reaches its maximum stroke in the first connector 2 (adjusted according to the different specifications of the rebar 1), and the elastic member 8 deforms to form a preset prestress. At this time, the second connector 3 is screwed into the narrow end 22 to complete the fixing of the two rebars 1.

[0041] When the operator places the two fixed reinforcing bars 1 into the concrete mold and grouts them, the grout flows through the first through hole 23 into the second grouting gap and the third grouting gap (e.g., Figure 5 As shown by the dashed arrow in the middle, the grout also enters the first grouting gap through the second through hole 24, thereby filling the connection between the locking member 4 and the first connecting member 2, the locking member 4 and the B steel bar 1, and the A steel bar 1 and the first connecting member 2 respectively. After the grout solidifies, a stable prestressing relationship is formed.

[0042] Example 2: Based on the above embodiments, in order to further clarify and completely explain the technical solutions therein, the present invention also provides Embodiment Two. For example... Figure 1 , Figure 6 , Figures 8 to 10 As shown, in this second embodiment, the threaded head 11 has a boss 12. A first gap is provided between the boss 12 and the end face of the first connector 2, and a second gap is provided between the end face of the first connector 2 and the end face of the second connector 3. Two interlocking locking toothed rings 9 are provided in both the first and second gaps. Each locking toothed ring 9 includes a main ring body 91, on which several circumferentially distributed and inclined teeth 92 are fixed. In the first gap, one main ring body 91 is fixed to the end face of the first connector 2 by welding, and the other main ring body 91 is fixed to the threaded head 11 by welding. In the second gap, one main ring body 91 is fixed to the end face of the first connector 2 by welding, and the other main ring body 91 is fixed to the end face of the second connector 3 by welding.

[0043] Therefore, when B-reinforcing bar 1 is screwed on, B-reinforcing bar 1 and its threaded head 11 move closer to the first connector 2 and compress the first gap until the teeth 92 of the two locking rings 9 mesh with each other. At this point, the first gap is further compressed, causing the teeth 92 of the two locking rings 9 to press against each other until they overlap and deform, thus completing the connection. This stabilizes the connection between the first connector 2 and the threaded head 11 by limiting its radial displacement. The same principle applies to the second gap, which will not be elaborated here.

[0044] Example 3: Based on the above embodiments, in order to further clarify and completely explain the technical solutions therein, the present invention also provides Embodiment Three. For example... Figure 4 As shown in the third embodiment, a plurality of locking grooves 44 are provided on the inner wall of the locking member 4. When the locking piece is tightly abutting against the reinforcing bar 1, the locking grooves 44 are engaged with the protrusions of the reinforcing bar 1.

[0045] Therefore, in summary, the technical solutions provided by the present invention and its embodiments have advantages over the prior art, including but not limited to the following: This invention includes a first grouting gap, a second grouting gap, and a third grouting gap. During grouting, concrete grout can penetrate and fill these three gaps, respectively filling the spaces between the reinforcing bar 1 and the first connector 2, the locking member 4 and the first connector 2, and the locking member 4 and the reinforcing bar 1. After the grout solidifies, not only is a tight fit achieved between the components, but also, through the adhesive effect of the grout and the gap-filling effect, the reinforcing bar 1 is securely locked inside the connector, completing a reliable fixation. This design, through multi-gap synergistic grouting, significantly enhances the integrated connection strength between the two reinforcing bars 1 and the connector, fully meeting the core requirements of prestressed concrete structures for connection stability.

[0046] Meanwhile, the present invention provides a first gap between the boss 12 and the end face of the first connector 2, and a second gap between the end face of the first connector 2 and the end face of the second connector 3. Two interlocking toothed rings 9 are disposed within each of the first and second gaps. During the locking of the reinforcing bar 1, both the reinforcing bar 1 and the second connector 3 move towards the end face of the first connector 2, exerting a squeezing effect on the first and second gaps, causing the two locking toothed rings 9 to gradually approach and engage with each other. Through the meshing action and moderate deformation of the teeth 92 on the locking toothed rings 9, an effective anti-loosening limiting structure is formed, which can suppress the relative displacement and loosening of the connection parts, achieving a stable connection between the reinforcing bar 1, the first connector 2, and the second connector 3, further meeting the stringent requirements for connection stability in prestressed concrete structures.

[0047] Furthermore, the present invention provides a plurality of locking grooves 44 on the inner wall of the locking member 4. These locking grooves 44 can precisely fit and engage with the protrusions of the reinforcing bar 1 to form a mechanical interlocking structure. This interlocking design further enhances the locking effect between the locking member 4 and the reinforcing bar 1, effectively dispersing the stress generated when the reinforcing bar 1 is under tension, avoiding stress concentration that could damage the connection, and effectively limiting the axial displacement of the reinforcing bar 1. This ensures that the reinforcing bar 1 will not come out of the locking member 4 under tension due to excessive force, thereby further guaranteeing the stability of the prestressed concrete structure connection.

[0048] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this invention and its equivalents, this invention also intends to include these modifications and variations.

Claims

1. A prestressed concrete connector, characterized in that, include: The first connector (2) has a threaded head (11) at one end, and the threaded head (11) is fixed on one of the steel bars (1); Locking member (4), the locking member (4) is disposed inside the first connecting member (2) and is snapped onto the outside of another steel bar (1); The second connector (3) is threadedly connected to the first connector (2); The first connector (2) is further provided with a first gasket (5) and a second gasket (6). The inner wall of the first connector (2), the first gasket (5) and the outer wall of the threaded head (11) are combined to form a first grouting gap. The inner wall of the first connector (2), the second gasket (6) and the outer wall of the locking member (4) are combined to form a second grouting gap. The second gasket (6) and the inner cavity of the locking member (4) are combined to form a third grouting gap.

2. A prestressed concrete connector as described in claim 1, characterized in that, The first connector (2) has a wide end (21) and a narrow end (22). The inner wall of the wide end (21) has a thread and is threaded to the threaded head (11) through the thread. The outer wall of the narrow end (22) has a thread and is threaded to the second connector (3) through the thread. The first connector (2) is also provided with a plurality of first through holes (23) and a plurality of second through holes (24). The first through holes (23) are located near the wide end (21), and the second through holes (24) are located near the narrow end (22).

3. A prestressed concrete connector as described in claim 2, characterized in that, The locking member (4) has a first inclined surface (43) away from the first gasket (5). The locking member (4) has several third through holes (42) that cooperate with the first through hole (23). The locking member (4) also has several locking seams (41). One end of the locking seam (41) extends into the third through hole (42), and the other end extends from the first inclined surface (43) to the opening of the locking member (4), thereby dividing the locking member (4) into several locking pieces.

4. A prestressed concrete connector as described in claim 3, characterized in that, The inner wall of the locking member (4) is provided with a plurality of locking grooves (44). When the locking piece is tightly abutted against the reinforcing bar (1), the locking grooves (44) are engaged with the protrusions of the reinforcing bar (1).

5. A prestressed concrete connector as described in claim 1, characterized in that, The first gasket (5) and the second gasket (6) are respectively provided with a first groove (51) and a second groove (61). A flexible sealing element (7) is fixed in both the first groove (51) and the second groove (61). The first gasket (5) is fixed to the end of the locking member (4) away from the first inclined surface (43). The first gasket (5) and the second gasket (6) are connected by an elastic element (8).

6. A prestressed concrete connector as described in claim 2, characterized in that, The first connector (2) is provided with a limiting groove (26) to limit the displacement of the first gasket (5), and the first connector (2) is provided with a second inclined surface (25) that cooperates with the first inclined surface (43) on the side near the narrow end (22).

7. A prestressed concrete connector as described in claim 1, characterized in that, The threaded head (11) has a boss (12), and a first gap is provided between the boss (12) and the end face of the first connector (2). A second gap is provided between the end face of the first connector (2) and the end face of the second connector (3). Two interlocking toothed rings (9) are provided in both the first gap and the second gap.

8. A prestressed concrete connector as described in claim 7, characterized in that, The locking toothed ring (9) includes a main ring body (91), on which a plurality of circumferentially distributed and inclined teeth (92) are fixed.

9. A prestressed concrete connector as described in claim 8, characterized in that, Within the first gap, one of the main ring bodies (91) is fixed to the end face of the first connector (2), and the other main ring body (91) is fixed to the threaded head (11). Within the second gap, one of the main ring bodies (91) is fixed to the end face of the first connector (2), and the other main ring body (91) is fixed to the end face of the second connector (3).

10. A prestressed concrete connector as described in claim 5, characterized in that, The elastic element (8) is a cylindrical spring or a disc spring.

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