A plug-in stop structure and prefabricated component combination

Abstract

The present invention provides a plug-in stop structure, comprising: an outer sleeve, an insertion rod and a stopper, wherein the outer sleeve is fixedly connected to one end of a stress-bearing rib and has an axially formed plug-in cavity; the insertion rod has a plug neck formed at a portion close to the plug connector, and an axial stop surface is formed between the plug neck and the plug connector; the rigid end of the stopper is fixedly mounted on the outer sleeve, and the elastic end of the stopper extends into the plug-in cavity and forms a reverse stop end surface; the stopper has a plug-in channel for the plug connector to pass through in the forward direction, and the contact area S1 between the reverse stop end surface and the axial stop surface is greater than the cross-sectional area S2 of the stress-bearing rib. The present invention makes the contact area S1 between the reverse stop end surface and the axial stop surface greater than the cross-sectional area S2 of the stress-bearing rib, so that when the plug-in stop structure realizes the anti-pullout function, even if the stress-bearing rib is pulled off, the elastic end of the stopper will not be broken or bent by the insertion rod, thereby ensuring that the connection strength of the plug-in stop structure can meet the use requirements.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated concrete components, and in particular to a plug-in anti-retraction structure and a prefabricated component combination comprising the plug-in anti-retraction structure. Background Art

[0002] For precast concrete components, most products are not used alone. Therefore, after being prefabricated in the factory, they are transported to the construction site and connected with other same or different precast components according to design requirements to form an overall component combination that meets the design requirements.

[0003] Taking precast concrete piles as an example, the previous connection method was to design end plates at both ends of the precast concrete piles so that the end plates of the upper and lower sections of the precast concrete piles can be fixed by welding during connection. The specific construction method is to align the end plates of the upper and lower sections of the precast piles, adjust the verticality, and then connect them by electric welding. This connection method is greatly affected by human factors and meteorological factors, and because of the high requirements for the verticality and connection quality of the precast piles, the construction difficulty and construction cost are high. After sinking into the acid-base corrosive soil, the welding parts are susceptible to corrosion and there is a risk of gradual failure. In addition, because the welding method of the end plate structure does not connect the main force-bearing bars in the upper and lower precast piles, the steel cages in the two precast piles are independent of each other, resulting in the relatively weak strength of the entire pile after connection.

[0004] In order to solve the defects existing in the connection by end plate welding, a connector which does not require welding and can be directly plugged in has further emerged.

[0005] The prior art discloses a spring-clip connector, which includes a large nut sleeve, a small nut sleeve, a connector and an insertion rod, wherein the large nut sleeve is connected to the connector in a threaded manner, wherein the connector has a plurality of bent spring sheets in an annular array on one side accommodated in the large nut sleeve, and an angle greater than 0° is formed between the bent spring sheets and the inner side wall of the large nut sleeve; one side of the insertion rod is threadedly connected to the small nut sleeve, and the other side is provided with an annular groove on its outer circumferential surface, and the groove surface of the annular groove on the side away from the small nut sleeve is set as a blocking surface, which is used to limit the bent spring sheet clamped in the annular groove, and when the insertion rod passes through the connector, the blocking surface is clamped with the bent spring sheet to prevent the insertion rod from being pulled out.

[0006] Compared with the traditional welding connection method, the use of the above-mentioned connector can save the connection end plate, and thus has the advantages of less metal consumption, fast docking construction speed, and high connection strength. However, the pull-out resistance connection between the precast concrete piles needs to ensure that the pull-out resistance between the connectors embedded in the precast concrete piles is guaranteed, and it needs to ensure that the maximum bearing capacity between the inserted rod and the bent spring piece before damage is greater than the maximum bearing capacity of the steel rod embedded in the precast concrete pile and connected to the connector when it is broken, that is, it needs to meet the requirement that even if the force-bearing reinforcement is broken, the bent spring piece cannot fail due to bending or breaking. However, in the above-mentioned structure, the inserted rod and the bent spring piece cannot ensure that the connection strength required for use is met. Summary of the invention

[0007] The purpose of the present invention is to overcome the prior art and provide a plug-in stop structure. After the plug-in rod of the plug-in stop structure is plugged into the stopper, even if the force-bearing ribs in the prefabricated component are broken during the pull-out process, the elastic sheet will not be bent or broken, thereby ensuring a higher connection strength after the plug-in rod and the stopper are plugged in.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A plug-in anti-retraction structure, comprising:

[0010] The outer casing is fixedly connected to one end of the stress-bearing rib and is provided with an inserting cavity in the axial direction;

[0011] The plug rod has a plug neck formed at a portion close to the plug connector, and an axial stop surface is formed between the plug neck and the plug connector; and

[0012] A stopper, the rigid end of which is fixedly mounted on the outer casing, and the elastic end of which extends into the plug-in cavity and forms a reverse stopper end face;

[0013] The stopper has a plug-in channel for the plug connector to pass through in the forward direction, and the contact area S1 between the reverse stopper end face and the axial stopper surface is larger than the cross-sectional area S2 of the force-bearing rib, and the outer casing is made of metal.

[0014] Preferably, the rigid end has a circular ring body, and the elastic end has more than two elastic sheets spaced apart around the central axis of the circular ring body, the root of the elastic sheet is connected to one end of the circular ring body, and in the direction from the rigid end to the elastic end, each elastic sheet gradually approaches the central axis of the circular ring body.

[0015] Preferably, in the direction from the rigid end to the elastic end, the wall thickness of the elastic sheet is uniform or gradually decreases, and the sum of the minimum radius R1 of the plug neck and the minimum wall thickness H of the elastic sheet is greater than the minimum inner hole radius R2 of the annular body.

[0016] Preferably, the angle α between the axial stop surface and the central axis is greater than or equal to 45° and less than or equal to 90°.

[0017] Preferably, the sum of the maximum radius R3 of the plug connector and the minimum wall thickness H of the elastic sheet is smaller than the radius R4 of the plug cavity.

[0018] Preferably, the minimum cross-sectional area S3 of the plug neck is larger than the cross-sectional area S2 of the stress-bearing rib.

[0019] Preferably, the insertion cavity of the outer sleeve is provided with an internal thread, and the outer wall of the annular body is provided with an external thread matching the internal thread so that the outer sleeve is threadably connected to the annular body.

[0020] Preferably, the end of the annular body away from the elastic sheet is provided with a plurality of radial grooves spaced apart along the circumferential direction.

[0021] Preferably, the radial grooves are evenly distributed along the circumference of the annular body.

[0022] Preferably, a screw-on body is further included, and one end of the insertion rod away from the plug connector is a screw-on end matching the screw-on body, and a positioning protrusion is provided at a position of the insertion rod near the screw-on end.

[0023] Another object of the present invention is to provide a prefabricated component combination connected by the plug-in stop structure.

[0024] To achieve the above another object, the present invention provides a prefabricated component combination, including a first prefabricated component and a second prefabricated component, wherein the first prefabricated component and the second prefabricated component are connected by the above plug-in stop structure.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) An axial stop surface is formed between the plug neck of the plug rod and the plug connector, a reverse stop end surface is formed at the elastic end of the stopper, and the stopper is arranged in the plug-in cavity of the outer casing. After the plug rod is inserted into the plug-in cavity and the plug connector passes through the plug-in passage of the stopper, the reverse stop end surface abuts against the axial stop surface under tension, thereby realizing the plug-in stop function between the plug rod and the stopper;

[0027] (2) Since the contact area S1 between the reverse stop end face and the axial stop face is larger than the cross-sectional area S2 of the stress-bearing rib, when the plug-in stop structure realizes the anti-pullout function, even if the stress-bearing rib is broken, the elastic end of the stop member will not be damaged or bent by the plug rod, thereby ensuring that the connection strength of the plug-in stop structure can meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a cross-sectional view of the plug-in stop structure in an embodiment of the present invention;

[0029] Figure 2 is a cross-sectional view of an outer casing in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the plunger in an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of a stopper in an embodiment of the present invention;

[0032] Figure 5 is a cross-sectional view of a stopper in an embodiment of the present invention;

[0033] Figure 6 A comparison diagram of the contact surface area between the axial stop surface and the reverse stop end surface, the minimum cross-sectional area of ​​the plug neck, and the cross-sectional area of ​​the stress-bearing rib in an embodiment of the present invention;

[0034] Figure 7 It is a structural schematic diagram of a prefabricated component assembly in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the technical solution of the present invention, a detailed description is given below in conjunction with the accompanying drawings and specific embodiments.

[0036] like Figure 1 As shown, the present invention discloses a plug-in stop structure, including an outer casing 1, an insertion rod 2 and a stopper 3, wherein the outer casing 1 needs to be pre-buried in a concrete precast component and connected to and fixed to one end of a force-bearing bar 4 in the concrete precast component, and the stopper 3 is installed at the end of the outer casing 1 exposed from the concrete material, and the stopper 3 is used to cooperate with the insertion rod 2, so that the insertion rod 2 can be kept in the inserted position after being positively inserted into the outer casing 1, and will not fall out of the outer casing 1, thereby realizing the plug-in stop function. The outer casing 1, the insertion rod 2 and the stopper 3 are preferably located on the same central axis.

[0037] like Figure 1 and Figure 2 As shown, the outer casing 1 is a cylindrical nut, the outer peripheral surface of the main body of which is a cylindrical outer surface, and an inserting cavity 11 is formed in the axial direction inside the outer casing, and a constriction portion 12 is formed at the lower end of the inserting cavity 11, and the constriction portion 12 can be clamped with the stress reinforcement 4 with a swaging head at the end, so as to be connected with the stress reinforcement 4 of the prefabricated concrete component. Of course, for the connection of the stress reinforcement 4 in the concrete cast-in-place construction operation, the outer casing 1 can also be screwed or clamped on the end of the stress reinforcement 4, and preferably, the outer casing 1 is metal.

[0038] like Figure 1 and Figure 3As shown, the plug rod 2 is in the shape of a rotating body, and the lower end of the plug rod 2 forms a plug connector 21 with a radially enlarged diameter from the end surface to the rod body, and a plug neck 22 is formed near the plug connector 21, and an axial stop surface 23 is formed between the plug neck 22 and the plug connector 21.

[0039] like Figure 1 , Figure 4 and Figure 5 As shown, the stopper 3 is in the shape of a body of revolution, the upper part of the stopper 3 is a rigid end, and the lower part is an elastic end, the rigid end is fixed to the outer casing 1, the elastic end extends into the plug-in cavity 11 and forms a reverse stop end face 31, and the stopper 2 has a through plug-in channel 32.

[0040] In the above structure, when the insertion rod 2 is inserted into the outer sleeve 1, the plug connector 21 of the insertion rod 2 extends into the insertion channel 32 of the stopper 3, and the plug connector 21 stretches the elastic end of the stopper 3, causing the elastic end to undergo elastic deformation. After the plug connector 21 passes through the insertion channel 32, the axial stop surface 23 of the insertion rod 2 is located below the reverse stop end surface 31 of the stopper 3, and the elastic end that was originally stretched out is reset and gathered. When the reverse stop end surface 31 is in contact with the axial stop surface 23, the stopper 3 blocks the plug connector 21 of the insertion rod 2, thereby realizing the plug-in stop function.

[0041] In addition, if Figure 6 As shown, in the present embodiment, in order to make the plug-in stop structure not only realize the plug-in stop function, but also meet the connection strength requirements when the precast concrete components are connected, it is necessary to ensure that the plug-in stop structure can realize the pull-out resistance function. Even when the stress reinforcement 4 is broken, the stopper 3 of the plug-in stop structure will not be broken by the insertion rod 2 due to excessive force. The contact area S1 between the reverse stop end face 31 and the axial stop face 23 is greater than the cross-sectional area S2 of the stress reinforcement 4. Therefore, when the materials of the insertion rod 2, the stopper 3 and the stress reinforcement 4 are the same, the maximum pull-out resistance that the insertion rod 2 and the stopper 3 can withstand will be greater than the maximum breaking force that the stress reinforcement 4 can withstand before breaking, thereby ensuring that the plug-in stop structure can meet the use requirements.

[0042] Furthermore, the rigid end of the stopper 3 has a ring body 33, and the elastic end has two or more elastic sheets 34 spaced and distributed around the central axis of the ring body 33. The root of the elastic sheet 34 is connected to one end of the ring body 33, and in the direction from the rigid end to the elastic end, each elastic sheet 34 gradually approaches the central axis of the ring body 33. The number of elastic sheets 34 can be 2, 3, 4, 5, 6, etc. Relatively speaking, the more the number of elastic sheets 34, the better the elasticity of the elastic sheet 34, but the anti-pullout and anti-retreat force is weakened.

[0043] In the above structure, the annular body 33 is used to connect with the outer sleeve 1, and the elastic sheets 34 are arranged at intervals in the circumferential direction so that when the plug connector 21 is inserted, it is easier to open the elastic end, reducing the force required when the plug rod 2 is inserted, and each elastic sheet 34 gradually approaches the central axis of the annular body 33, so that the elastic sheet 34 has a greater rebound tendency and can rebound more easily, and can also reduce the gap between the stopper 3 and the plug rod 2 after the plug rod 2 is inserted. Among them, the connection between the annular body 33 and the outer sleeve 1 can be a threaded connection, in which an internal thread is provided in the plug-in cavity 11 of the outer sleeve 1, and an external thread matching the internal thread is provided on the outer wall of the annular body 33 so that the outer sleeve 1 and the annular body 33 are threadedly connected, so that the annular body 33 can be quickly installed in the outer sleeve 1. In this embodiment, the elastic sheets 23 are set to 6.

[0044] Furthermore, in this embodiment, the outer diameter of the plug connector 21 gradually decreases from top to bottom to form a ball head shape, and the plug neck 22 is generally in an inverted cone shape with a diameter at the upper end being larger than a diameter at the lower end.

[0045] In the above structure, during the plugging process, since the elastic sheet 34 gradually approaches the central axis of the annular body 33, the inner diameter of the elastic end gradually decreases along the insertion direction. Therefore, in the present embodiment, the plug neck 22 is generally in the shape of an inverted cone with a diameter at the upper end larger than that at the lower end. Through the cooperation between the plug neck 22 of the plug rod 2 and the plugging channel 32 of the stopper 3, the plug rod 2 can be guided to be inserted into the outer sleeve 1 basically along the central axis of the stopper 3, and after the plugging is completed, the central axes of the two are basically coincident, and the inner wall of the elastic sheet 34 of the stopper 3 can be fitted with the plug neck 22, reducing the assembly gap between the plug rod 2 and the stopper 3, reducing the vibration between the two, and at the same time avoiding the elastic sheet 34 from being always in a state of being stretched open by the plug neck 22, thereby avoiding the elastic force inside the elastic sheet 34 and reducing the fatigue damage caused by the elastic sheet 34. In addition, after the plug connector 21 of the insertion rod 2 is inserted into the elastic end, the elastic sheets 34 will be stretched open. In order to avoid the elastic deformation of the elastic sheets 34 caused by the insertion of the plug connector 21 to undergo a sudden change, the plug connector 21 is formed into a ball head shape so that the elastic sheets 34 are gradually stretched open during the insertion process of the plug connector 21, thereby reducing the sudden change force on the elastic sheets 34 and preventing the elastic sheets 34 from being broken when stretched open. After the plug connector 21 passes through the elastic end, the elastic sheets 34 rebound and adhere to the neck 22 of the insertion rod 2, so that when the plug connector 21 retracts, the reverse stop surface 31 blocks the axial stop surface 23, preventing the plug connector 21 from retracting.

[0046] Furthermore, in the direction from the rigid end to the elastic end, the wall thickness of the elastic sheet 34 is uniform or gradually decreases, and the sum of the minimum radius R1 of the plug neck 22 and the minimum wall thickness H of the elastic sheet 34 is greater than the minimum inner hole radius R2 of the annular body 33 .

[0047] In the above structure, since the elastic sheet 34 will always be subjected to the bending force of the plug connector 21 during the stopping process, the elastic sheet 34 will always have a tendency to bend toward the central axis. Therefore, in order to reduce the bending force on the elastic sheet 34, it is necessary to reduce the curvature of the elastic sheet 34, that is, the reverse stop surface 31 will move in the direction away from the central axis. Therefore, it is only necessary to ensure that at least part of the reverse stop surface 31 can fit with the axial stop surface 23. Therefore, as long as the sum of the minimum radius R1 of the plug neck 22 and the minimum wall thickness H of the elastic sheet 34 is greater than the minimum inner hole radius R2 of the annular body 33, the reverse stopping effect can be achieved while the curvature of the elastic sheet 34 is reduced. Since the plug connector 21 needs to pass through the annular body 33, the maximum outer radius R3 of the plug connector 21 is smaller than the minimum inner hole radius R2 of the annular body 33, and the sum of the minimum radius R1 of the plug neck 22 and the minimum wall thickness H of the elastic sheet 34 is larger than the minimum inner hole radius R2 of the annular body 33. Therefore, the sum of the minimum radius R1 of the plug neck 22 and the minimum wall thickness H of the elastic sheet 34 must be larger than the maximum outer radius R3 of the plug connector 21. Therefore, when the insertion rod 2 retracts, the reverse stop end face 31 is always at least partially in contact with the axial stop face 23, thereby reducing the curvature of the elastic sheet 34.

[0048] Of course, when the plug connector 21 is inserted into the elastic end, the elastic sheet 34 will be stretched open. When the elastic sheet 34 is stretched open, if the elastic sheet 34 is attached to the inner wall of the outer casing 1, the elastic sheet 34 may not be stretched open further, thereby causing the plug connector 21 to be unable to pass through the plug channel 32. Therefore, in this embodiment, the sum of the maximum radius R3 of the plug connector 21 and the minimum wall thickness H of the elastic sheet 34 needs to be smaller than the radius R4 of the plug cavity 11. In addition, during plugging, lubricating materials such as lubricating grease are applied to the contact portion of the plug rod 2 and the elastic sheet 34, or a layer of self-lubricating materials such as polytetrafluoroethylene, polyacetal, polyoxymethylene, etc. is compounded on the plug connector 21 of the plug rod 2 to reduce the friction coefficient between the two, thereby further reducing the friction force and reducing the friction damage between the elastic sheet 34 and the plug rod 2.

[0049] In addition, in order to make the axial stop surface 23 and the reverse stop end surface 31 cooperate well and have a better anti-retraction effect, the angle α between the axial stop surface 23 and the central axis is greater than or equal to 45° and less than or equal to 90°. If the angle α is greater than 90° and less than 180°, when the axial stop surface 23 and the reverse stop end surface 31 are in contact, and the plug rod is subjected to a vertical upward pulling force, if the material properties of the elastic sheet 34 are not enough, the elastic sheet 34 will be pulled back by the plug connector 21 to open, thereby making the anti-retraction function invalid. When the material properties of the elastic sheet 34 are too high, when the plug connector 21 is inserted, the elastic sheet 34 cannot be easily opened, and a greater pressure needs to be applied. If the angle α is greater than 0° and less than 45°, the horizontal component of the force of the plug connector 21 on the elastic sheet 34 will be greater, making the elastic sheet 34 easier to bend. In this embodiment, the angle α between the axial stop surface 23 and the central axis is in a range of 75° to 90°.

[0050] like Figure 6 As shown, in order to further ensure the reliability of the connection strength of the plug-in anti-retraction mechanism of this embodiment and prevent the plug rod 2 from being pulled apart between the plug neck 22 and the plug connector 21 when subjected to a pulling force, the minimum cross-sectional area S3 of the plug neck 22 is greater than the cross-sectional area S2 of the force-bearing rib 4.

[0051] Furthermore, in this embodiment, a plurality of radial grooves 35 are circumferentially spaced apart at the end of the annular body 33 away from the elastic sheet 34. Preferably, the radial grooves 35 are evenly distributed along the circumferential intervals of the annular body 33. The provision of the radial grooves 35 makes it easy to install the stopper 3 in the plug-in cavity 11 of the outer sleeve 1 by means of an installation tool (such as a screwdriver).

[0052] In addition, the plug-in stop structure in this embodiment further includes a screw body 5, and the end of the plug rod 2 away from the plug connector 31 is a screw end 25 matching the screw body 5, and the plug rod 2 is provided with a positioning protrusion 24 at a position close to the screw end 25. The screw body 5 is provided on other prefabricated components, and the screw end 25 is used to connect with the screw body 5, that is, the plug rod 2 is connected to another prefabricated component by threading. Since the elastic sheet 34 in the above structure has a certain elastic deformation, the insertion rod 2 can penetrate deeper into the outer shell 1 until the bottom end of the insertion rod 2 abuts against the outer shell 1 during the insertion of the insertion rod 2 into the outer shell 1 equipped with the stopper 3. When the insertion rod 2 is inserted into the outer shell 1 and the plug connector 21 is limited by the elastic sheet 34, the positioning protrusion 24 can prevent the insertion rod 2 from extending too far into the outer shell 1, resulting in a large gap between the axial stop surface 23 of the plug connector 21 and the reverse stop end surface 31 of the elastic sheet 34 in the axial direction, thereby causing an unstable connection. Of course, it can also prevent the threaded end 25 of the insertion rod 2 from being screwed into the threaded body 5 too much, resulting in a shortened length of the insertion rod 2 exposed to the outside, resulting in the insertion rod 2 not extending enough into the outer shell 1, resulting in the plug connector 21 not completely passing through the plug channel 32, and the retreat prevention function cannot be achieved.

[0053] like Figure 7 As shown, in addition to the above-mentioned plug-in anti-retraction structure, the present invention also provides a prefabricated component combination, including a first prefabricated component 6, a second prefabricated component 7 and the above-mentioned plug-in anti-retraction structure, the plug-in anti-retraction structure is used to connect the first prefabricated component 6 and the second prefabricated component 7, wherein the plug-in anti-retraction structure The rod 2 and the screw body 5 are arranged on the first prefabricated component 6, the screw body 5 is pre-buried in the first prefabricated component 6, the rod 2 can be detachably connected to the screw body 5 through the threaded end 25, the outer shell 1, the stopper 3 and the stress rib 4 of the plug-in anti-retraction structure are arranged on the second prefabricated component 7, the outer shell 1 and the stress rib 4 are pre-buried in the second prefabricated component 7, after the stopper 3 is screwed into the outer shell 1, the rod 2 is inserted into the plug-in channel 32 of the stopper 3, and the first prefabricated component 6 and the second prefabricated component 7 are firmly connected together through the snap-fit ​​cooperation of the rod 2 and the stopper 3.

[0054] In an environment with acids, alkalis and other substances that are corrosive to metals, in order to prevent the stress-bearing bars 4 and the plug-in stop structure of the two prefabricated components from rusting due to exposure, epoxy resin can be coated on the connected end faces of the prefabricated components. At the same time, the outer casing 1 is filled with epoxy resin. Moreover, by filling with epoxy resin, the pull-out resistance of the plug-in stop structure can be further improved.

[0055] The above are only preferred embodiments of the present invention. The protection scope of the present invention shall be based on the scope defined by the claims. Several improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A plug-in stop structure, characterized in that: include: An outer casing (1) is fixedly connected to one end of the force-bearing rib (4) and is provided with an inserting cavity (11) in the axial direction; The plug rod (2) is formed with a plug neck (22) at a portion close to the plug connector (21), and an axial stop surface (23) is formed between the plug neck (22) and the plug connector (21); an angle α is formed between the axial stop surface (23) and the central axis, and the angle value of the angle α is equal to 90°; and A stopper (3), the rigid end of which is fixedly mounted on the outer casing (1), and the elastic end of which extends into the plug-in cavity (11) and forms a reverse stopper end surface (31); The stopper (3) has a plug-in passage (32) for the plug connector (21) to pass through in the forward direction, and the contact area S1 between the reverse stopper end face (31) and the axial stopper face (23) is greater than the cross-sectional area S2 of the force-bearing rib (4), and the outer casing (1) is made of metal; The rigid end has a circular ring (33), and the elastic end has two or more elastic sheets (34) spaced apart around the central axis of the circular ring (33). The root of the elastic sheet (34) is integrally connected to one end of the circular ring (33), and in the direction from the rigid end to the elastic end, each elastic sheet (34) gradually approaches the central axis of the circular ring (33); In the direction from the rigid end to the elastic end, the wall thickness of the elastic sheet (34) is uniform or gradually decreases, and the sum of the minimum radius R1 of the plug neck (22) and the minimum wall thickness H of the elastic sheet (34) is greater than the minimum inner hole radius R2 of the annular body (33); The minimum cross-sectional area S3 of the plug neck (22) is greater than the cross-sectional area S2 of the stress-bearing rib (4); The sum of the maximum radius R3 of the plug connector (21) and the minimum wall thickness H of the elastic sheet (34) is smaller than the radius R4 of the plug cavity (11).

2. The plug-in anti-retraction structure according to claim 1, characterized in that: The insertion cavity (11) of the outer casing (1) is provided with an internal thread, and the outer wall of the annular body (33) is provided with an external thread matching the internal thread so that the outer casing (1) and the annular body (33) are threadedly connected.

3. The plug-in anti-retraction structure according to claim 1, characterized in that: The end of the annular body (33) away from the elastic sheet (34) is provided with a plurality of radial grooves (35) spaced apart in the circumferential direction.

4. The plug-in anti-retraction structure according to claim 3, characterized in that: The radial grooves (35) are evenly spaced along the circumference of the annular body (33).

5. The plug-in anti-retraction structure according to claim 1, characterized in that: It also includes a screw-on body (5), one end of the insertion rod (2) away from the plug connector (21) is a screw-on end (25) matching the screw-on body (5), and a positioning protrusion (24) is provided on the insertion rod (2) at a position close to the screw-on end (25).

6. A prefabricated component assembly, comprising a first prefabricated component (6) and a second prefabricated component (7), characterized in that: The first prefabricated component (6) and the second prefabricated component (7) are connected by the plug-in anti-retraction structure according to any one of claims 1 to 5.

Images