Connection assembly

Abstract

The present invention relates to a connection assembly, comprising: a small sleeve; a large sleeve, an insertion cavity being formed at the interior thereof, and an internal thread being formed within the insertion cavity at an end close to the small sleeve; an insertion rod, a cross-section thereof in the axial direction having a T-shaped structure, a limiting protrusion being formed at the top of one end of the insertion rod in the axial direction, and the other end forming an insertion end capable of extending into the insertion cavity; and an intermediate nut, the outer side thereof being provided with an external threaded connection end in threaded connection with the small sleeve, a through-hole being formed at the interior of said nut for the insertion end to be inserted therein, the outer diameter of the insertion end being smaller than the inner diameter of the through-hole, and the intermediate nut being provided with a first end portion and a second end portion away from each other, wherein when the insertion end of the insertion rod is inserted into the intermediate nut, the first end portion abuts against the limiting protrusion. The present invention has a simple structure, and by virtue of improvements to the insertion rod, assembly can be simplified, such that a certain movement angle can be achieved when the small sleeve is connected to the insertion rod, so as to increase the tolerance of connection.

Description

Connecting Components Technical Field

[0001] The present invention relates to the field of building technology, in particular to a connection component. Background Art

[0002] In the field of construction technology, to facilitate production and reduce construction time, reinforced concrete precast piles are often spliced ​​together to ensure the length of the precast piles. To ensure a quick and secure connection between two reinforced concrete precast piles, multiple connecting components are typically used to connect the rebar within the two precast reinforced concrete piles.

[0003] With the development of prefabricated component connection technology, prefabricated component quick connection technology has emerged. This technology sets a mechanical connection component between two prefabricated components and completes the quick connection through plug-in. In traditional technology, the mechanical connection component includes a plug rod, a small sleeve, and a large sleeve; the small sleeve and the large sleeve are respectively connected to the two prefabricated components to be connected. One end of the plug rod is installed in the small sleeve, and the other end can be inserted into the large sleeve to complete the locking. In actual implementation, the plug rod is connected to the small sleeve. Since the plug rod and the small sleeve are connected by a threaded connection, the stress generated after the connection is large, seriously affecting the overall performance of the connection component. Therefore, the tolerance of the connection component after connection is poor.

[0004] In view of the above problems, it is necessary to improve them. Technical issues

[0005] The present invention aims to overcome the above-mentioned defects in the prior art and provide a connection assembly with a simple structure and stable connection, thereby increasing the tolerance when the connector is inserted into the right position and improving the connection quality of the entire connection assembly. Technical Solutions

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: a connecting component, comprising: a small sleeve; a first internal thread is formed inside the large sleeve; a plug-in cavity is formed inside the large sleeve, and an internal thread is formed in the plug-in cavity near one end of the small sleeve; an insert rod, the cross section along the axial direction is a T-shaped structure, a limiting protrusion is formed at one axial end, and a plug-in end that can be extended into the plug-in cavity is formed at the other end; a limiting structure is built into the small sleeve, and is used to limit the limiting protrusion of the insert rod from upwardly dislodging the small sleeve; an intermediate nut, the outer side of which has an external threaded connection end that is screwed to the first internal thread of the small sleeve, and a through hole is formed inside the intermediate nut for inserting the plug-in end, the outer diameter of the plug-in end is smaller than the inner diameter of the through hole, and the intermediate nut has a first end and a second end that are far away from each other; when the plug-in end of the insert rod is inserted into the intermediate nut, the first end fits with the limiting protrusion; the intermediate sleeve, The cam is fixedly connected to the outer sleeve of the sleeve and is fixed on the outer sleeve with a plurality of springs, and the cam is fixed on the outer sleeve of the sleeve so as to prevent the cam from sliding off the sleeve and causing the cam to slide in the opposite direction of the insertion.

[0007] As a preferred solution of the present invention, the elastic portion includes two or more elastic pieces distributed in a ring array, and a gap extending in the axial direction is formed between two adjacent elastic pieces. The elastic portion can radially expand or contract through the gap.

[0008] As a preferred solution of the present invention, the elastic portion and the plug end are made of 20CrMnTi, and the Rockwell hardness of the plug end is lower than the Rockwell hardness of the surface of the elastic portion.

[0009] As a preferred solution of the present invention, the plug-in end of the insertion rod is provided with a chamfer, and the elastic part further includes a guide bevel, which is located at one end of the elastic part relatively close to the intermediate sleeve, and the chamfer is used to abut the guide bevel and guide the elastic part to expand radially.

[0010] As a preferred solution of the present invention, the inner wall of the intermediate sleeve has a frustum that gradually expands along the insertion direction, and the outer wall of the elastic part is provided with an annular inclined surface that matches the frustum; the plug-in end can extend into the elastic part through the intermediate sleeve along the insertion direction, and the elastic part can elastically embrace the plug-in end.

[0011] As a preferred solution of the present invention, a plurality of notches are formed on one end of the elastic portion away from the inclined surface, and the notches and the gaps are arranged alternately.

[0012] As a preferred solution of the present invention, the extending direction of the notch and the gap is parallel to the axial direction of the elastic portion; or, there is a certain inclination angle between the extending direction of the notch and the gap and the axial direction of the elastic portion.

[0013] As a preferred solution of the present invention, the number of the annular serrations increases sequentially along the insertion direction of the plug end.

[0014] As a preferred solution of the present invention, the end of the elastic portion relatively close to the middle nut smoothly transitions to the inner wall of the middle sleeve.

[0015] As a preferred solution of the present invention, the intermediate sleeve includes a first connecting section and a second connecting section that are connected to each other. The first connecting section is located on a side of the second connecting section that is relatively close to the small sleeve. An external thread is formed on the first connecting section. The external thread of the first connecting section is connected to the large sleeve, and the second connecting section is connected to the limiting sleeve.

[0016] As a preferred solution of the present invention, the second connecting section is located on the inner side of the limiting sleeve; the radial dimension of the outer peripheral wall of the second connecting section matches the radial dimension of the inner peripheral wall of the limiting sleeve.

[0017] As a preferred solution of the present invention, a first protrusion is further provided on the outer peripheral wall of the second end portion, the first protrusion and the second end portion are on the same horizontal plane, and the first protrusion is integrally formed with the middle nut.

[0018] As a preferred solution of the present invention, the outer diameter of the first protrusion is larger than the inner diameter of the small sleeve and the inner diameter of the middle sleeve, and both sides of the first protrusion can abut against the end of the small sleeve and the end of the middle sleeve respectively.

[0019] As a preferred solution of the present invention, the outer peripheral wall of the first protrusion is a non-circular structure.

[0020] The connecting assembly comprises: a small sleeve; a first internal thread is formed inside the sleeve; a first connecting cavity and a second connecting cavity are provided, a first partition is formed between the first connecting cavity and the second connecting cavity, and a first prestressed steel rod is screwed in the first connecting cavity; a large sleeve has a third connecting cavity and a plug-in cavity; an internal thread is formed in the plug-in cavity near one end of the small sleeve; a second partition is formed between the third connecting cavity and the plug-in cavity, and a second prestressed steel rod is screwed in the third connecting cavity; an insert rod has a T-shaped cross-section along the axial direction, a limited position protrusion is formed at one axial end, and an insert end that can be extended into the insert cavity is formed at the other end; an intermediate nut has an external threaded connecting end that is screwed to the small sleeve on the outside, and a through hole is formed inside the insert end for inserting the insert end, the outer diameter of the insert end is smaller than the inner diameter of the through hole, and the intermediate nut has a first end and a second end that are far away from each other; when the plug end of the insert rod is inserted into the intermediate nut, the first end The cam is fixedly connected to the second end of the large sleeve so as to prevent the plug-in end from sliding into the locking cam and to lock the plug-in end in the locking cam.

[0021] As a preferred solution of the present invention, the elastic abutment member includes a tendon pad or an elastic ring; the tendon pad or the elastic ring is arranged in the limiting sleeve.

[0022] As a preferred solution of the present invention, an annular groove adapted to the elastic part is formed on the tendon pad, and one end of the elastic part close to the notch is inserted into the annular groove for assembling the elastic part to the tendon pad.

[0023] As a preferred solution of the present invention, the elastic ring is located between the elastic part and the limiting sleeve, and the elastic ring is used to make the elastic part have a tendency to move in the opposite direction along the insertion direction.

[0024] As a preferred solution of the present invention, an oil seal is installed at the opening of the elastic portion close to the middle sleeve, and the oil seal is surrounded by the connection between the middle sleeve and the limiting sleeve.

[0025] As a preferred embodiment of the present invention, the oil seal is made of nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane or polytetrafluoroethylene.

[0026] As a preferred solution of the present invention, a buffer component is also included, and the buffer component is assembled between the middle nut and the limiting protrusion of the insertion rod.

[0027] As a preferred solution of the present invention, the buffer assembly includes a gasket, and a connecting through hole is provided in the gasket for the plug end to pass through.

[0028] As a preferred solution of the present invention, the outer end surfaces of the gasket, the middle nut and the limiting protrusion are on the same horizontal line.

[0029] As a preferred solution of the present invention, the gasket has a first limiting groove at one end close to the limiting protrusion, which gradually shrinks along the insertion direction. Correspondingly, the limiting protrusion is provided with a protrusion that cooperates with the first limiting groove; the plug-in end can be inserted into the gasket and the intermediate nut in sequence along the insertion direction, and the protrusion of the limiting protrusion is attached to the first limiting groove of the gasket.

[0030] As a preferred solution of the present invention, the protrusion, the limiting protrusion and the plug-in end are an integrally formed structure.

[0031] As a preferred solution of the present invention, the height of the protrusion along the axial direction is consistent with the height of the limiting protrusion along the axial direction.

[0032] As a preferred solution of the present invention, the cross-sectional shape of the protrusion and the first limiting groove is circular, arc-shaped, elliptical, conical, square or trapezoidal. Beneficial effects

[0033] The beneficial effects of the present invention are:

[0034] 1. The present invention has a simple structure. By improving the insertion rod, the assembly can be simplified so that the small sleeve can have a certain movable angle when connected to the insertion rod, thereby increasing the connection tolerance.

[0035] 2. The seamless connector provided by the present invention is simple to process, easy to assemble, has reliable connection strength, can effectively reduce construction costs and engineering time, and has good economic benefits.

[0036] 3. The present invention can effectively avoid stress concentration between the middle nut and the insertion rod by assembling a gasket between the middle nut and the limiting protrusion, and providing a protrusion at the bottom of the limiting protrusion, thereby extending the service life of the connection assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic structural diagram of a connection assembly according to an embodiment of the present invention;

[0038] FIG2 is a front view of a connecting assembly according to an embodiment of the present invention;

[0039] FIG3 is a cross-sectional view taken along line AA of FIG2 according to an embodiment of the present invention;

[0040] FIG4 is a schematic structural diagram of an intermediate sleeve according to a first embodiment of the present invention;

[0041] FIG5 is a schematic structural diagram of an elastic portion according to an embodiment of the present invention;

[0042] FIG6 is a schematic structural diagram of a tendon pad according to an embodiment of the present invention;

[0043] 7 is a schematic structural diagram of an insert rod according to an embodiment of the present invention;

[0044] FIG8 is a schematic structural diagram of an intermediate nut according to an embodiment of the present invention;

[0045] FIG9 is an exploded view of the structure of a connecting assembly according to an embodiment of the present invention;

[0046] 10 is a front view of the connection between the limiting sleeve and the intermediate sleeve in Example 1 of the present invention;

[0047] FIG11 is a cross-sectional view taken along line BB of FIG10 in accordance with the first embodiment of the present invention;

[0048] 12 is a schematic structural diagram of a connection assembly according to a second embodiment of the present invention;

[0049] 13 is a front view of a second connection assembly according to an embodiment of the present invention;

[0050] FIG14 is a cross-sectional view taken along line CC of FIG13 of the second embodiment of the present invention;

[0051] Figure 15 is a schematic structural diagram of a small sleeve according to embodiment 2 of the present invention (I);

[0052] Figure 16 is a schematic structural diagram of a small sleeve according to embodiment 2 of the present invention (II);

[0053] Figure 17 is a schematic structural diagram of a large sleeve according to embodiment 2 of the present invention (I);

[0054] Figure 18 is a schematic structural diagram of a large sleeve according to embodiment 2 of the present invention (II);

[0055] FIG19 is a front view of a connection assembly according to a third embodiment of the present invention;

[0056] FIG20 is a DD sectional view of FIG19 of the third embodiment of the present invention;

[0057] FIG21 is an exploded view of the structure of the connection assembly of Example 3 of the present invention;

[0058] 22 is a front view of the connection between the intermediate sleeve and the limiting sleeve in the fourth embodiment of the present invention;

[0059] FIG23 is a cross-sectional view taken along line EE of FIG22 in accordance with the fourth embodiment of the present invention;

[0060] 24 is a schematic diagram of the connection between the elastic portion and the oil seal in Example 4 of the present invention;

[0061] 25 is a schematic structural diagram of the elastic portion of Example 5 of the present invention;

[0062] 26 is a front view of the connection between the intermediate nut, the rod and the washer in Example 6 of the present invention;

[0063] FIG27 is a sectional view taken along line FF of FIG26 in accordance with Embodiment 6 of the present invention;

[0064] FIG28 is a schematic structural diagram of a gasket in Example 6 of the present invention;

[0065] Description of the accompanying drawings: first prestressed steel rod 1, small sleeve 2, plug rod 3, intermediate sleeve 4, elastic part 5, elastic abutment 6, limiting sleeve 7, large sleeve 8, second prestressed steel rod 9, intermediate nut 10, external threaded connection end 11, through hole 12, first end 13, second end 14, first protrusion 15, first internal thread 16, first connecting cavity 21, second connecting cavity 22, first partition 23, external threaded connection end 31, plug end 32, chamfer 32-1, limiting Protrusion 33, external thread 40, frustum 41, first connecting section 43, second connecting section 44, spring piece 50, gap 51, annular inclined surface 52, annular serration 53, notch 54, guide slope 55, oil seal 56, opening 57, tendon washer 60, elastic ring 61, annular groove 62, buffer assembly 70, gasket 71, connecting through hole 72, first limiting groove 73, protrusion 74, internal thread 80, third connecting cavity 81, second partition 82, connecting assembly 100. Modes for Carrying Out the Invention

[0066] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0067] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0068] With the development of prefabricated component connection technology, prefabricated component quick connection technology has emerged. This technology sets a mechanical connection component between two prefabricated components and completes the quick connection through plug-in. In traditional technology, the mechanical connection component includes a plug rod, a small sleeve, and a large sleeve; the small sleeve and the large sleeve are respectively connected to the two prefabricated components to be connected. One end of the plug rod is installed in the small sleeve, and the other end can be inserted into the large sleeve to complete the locking. In actual implementation, the plug rod is connected to the small sleeve. Since the plug rod and the small sleeve are connected by a threaded connection, the stress generated after the connection is large, seriously affecting the overall performance of the connection component. Therefore, the tolerance of the connection component after connection is poor. Example 1:

[0069] With this in mind, refer to Figure 1, which illustrates a schematic perspective view of a connection assembly according to a first embodiment of the present invention. The present invention provides a connection assembly 100 for connecting two engineering components. In this embodiment, connection assembly 100 connects the rebar of different reinforced concrete precast piles to achieve assembly and lengthening between two precast piles (not shown). It will be appreciated that in other embodiments, connection assembly 100 may also be applied to other engineering fields, such as prefabricated buildings and poured concrete.

[0070] Please refer to Figure 1 again, and refer to Figures 2 to 11 together. Figure 2 is a main view of the connecting assembly of Example 1 of the present invention; Figure 3 is an AA sectional view of Figure 2 of Example 1 of the present invention; Figure 4 is a structural schematic diagram of the intermediate sleeve of Example 1 of the present invention; Figure 5 is a structural schematic diagram of the elastic part of Example 1 of the present invention; Figure 6 is a structural schematic diagram of the tendon pad of Example 1 of the present invention; Figure 7 is a structural decomposition diagram of the connecting assembly of Example 1 of the present invention; Figure 8 is a structural schematic diagram of the intermediate nut of Example 1 of the present invention; Figure 9 is a structural decomposition diagram of the connecting assembly of Example 1 of the present invention; Figure 10 is a main view of the connection between the limiting sleeve and the intermediate sleeve in Example 1 of the present invention; Figure 11 is a BB sectional view of Figure 10 in Example 1 of the present invention.

[0071] The connecting assembly is characterized in that it includes: a small sleeve 2; a first internal thread 16 is formed inside the large sleeve 8, a plug-in cavity is formed inside the large sleeve 8, and an internal thread 80 is formed in the plug-in cavity near one end of the small sleeve 2; an insert rod 3, the cross section along the axial direction is T-shaped, a limiting protrusion 33 is formed at one axial end, and a plug-in end 32 that can be extended into the plug-in cavity is formed at the other end; a limiting structure is built into the small sleeve 2, which is used to limit the limiting protrusion 33 of the insert rod 3 from being dislodged from the small sleeve 2 upward; an intermediate nut 10, the outer side of which has an external threaded connection end 11 that is screwed to the first internal thread 16 of the small sleeve 2, and a through hole 12 is formed inside the intermediate nut 10 for inserting the plug-in end 32, and the intermediate nut 10 has a plurality of holes that are far away from each other. The first end 13 and the second end 14; when the plug-in end 32 of the plug-in rod 3 is inserted into the intermediate nut 10, the first end 13 fits with the limiting protrusion 33; the intermediate sleeve 4 has an external thread 40 threadedly connected to the internal thread 80 of the large sleeve 8 and axially abuts the second end 14; the elastic part 5 is built into the large sleeve 8 to lock the plug-in end 32; the elastic abutment 6 is assembled with the elastic part 5 and is built into the limiting sleeve 7; the limiting sleeve 7 is a barrel-shaped structure with a sealed bottom and an open top; it is fixedly connected to the intermediate sleeve 4; it is built into the large sleeve 8; the present invention has a simple structure, and the improvement of the intermediate sleeve 4 and the limiting sleeve 7 can simplify assembly and reduce costs, and it is a pre-assembled part for easy management.

[0072] Among them, the limiting structure can be a limiting partition, a limiting block and other components. During use, the limiting structure is located in the small sleeve 2, and the limiting structure abuts and limits the upward movement of the limiting protrusion 33, thereby ensuring that the insertion rod 3 can be smoothly inserted into the elastic part 5, and ensuring the safety of use of the insertion rod 3.

[0073] The limiting protrusion 33 of the insertion rod 3 is a circular structure, and the outer diameter of the limiting protrusion 33 is larger than the outer diameter of the plug-in end 32, and the outer diameter of the plug-in end 32 is smaller than the inner diameter of the through hole 12 inside the intermediate nut 10. The insertion rod 3 is inserted into the intermediate nut 10, and the limiting protrusion 33 of the insertion rod 3 is fitted on the first end portion 13. The small sleeve 2 is threadedly connected to the external threaded connection end 11 of the intermediate nut 10, so that the small sleeve 2 can have a certain movable angle when connected to the insertion rod 3 to increase the tolerance of the connection. Because there is no fixed connection between the insertion rod 3 and the small sleeve 2 and the intermediate nut 10, and the intermediate nut 10 is fixedly connected to the small sleeve 2, the insertion rod 3 can produce a small angle of movement relative to the intermediate nut 10, that is, the insertion rod 3 can have a certain movable angle relative to the small sleeve 2.

[0074] Specifically, the lower end of the plug rod 3 is the plug end 32, which is slightly smaller than the large diameter inner hole of the middle sleeve 4, and the lowermost end of the plug end 32 is a rounded corner, so that it can enter the meshing middle sleeve 4 more smoothly.

[0075] Specifically, when connecting two prefabricated piles (not shown), a limiting protrusion 33 and a plug-in end 32 are formed at both ends of the insertion rod 3, and the insertion rod 3 is inserted into the middle nut 10 and connected to the small sleeve 2, and the end of the small sleeve 2 relatively away from the insertion rod 3 is assembled on the steel bar or pier head at the end of a prefabricated pile; further, the middle sleeve 4, the elastic part 5, the elastic abutment 6 and the limiting sleeve 7 are assembled in the large sleeve 8, and the large sleeve 8 is assembled and fixed on the steel bar or pier head at the end of another prefabricated pile, and the ends of the two prefabricated piles equipped with some connecting components are connected to each other, so that the two prefabricated piles can be quickly connected and the pile body can be lengthened; this embodiment is not limited to the connection of two prefabricated piles, and can also be used in other similar components.

[0076] It can be understood that the specific assembly order is not limited, as long as the small sleeve 2 and the insertion rod can be assembled to the end of one of the prefabricated piles, the middle sleeve 4 and the large sleeve 8 can be assembled to the corresponding positions of the other prefabricated pile, so that after the two prefabricated piles are docked, the elastic part 5 can effectively clamp against the end of the middle sleeve 4 relatively away from the small sleeve 2.

[0077] Please refer to Figures 1 and 4 again. Further, in one embodiment, an external thread 40 is formed on the outer side of the intermediate sleeve 4. Specifically, the external thread 40 is M27*2 or M30*2 thread. The external thread 40 of the intermediate sleeve 4 is connected to the internal thread 80 of the large sleeve 8. The threaded connection is reliable, easy to assemble, and has low processing cost. The interior of the intermediate sleeve 4 is hollow, and the upper end of the interior is a regular octagon, which is convenient for assembly. The middle of the intermediate sleeve 4 is a cylindrical structure.

[0078] Referring again to FIG. 5 , in one embodiment of the present invention, the elastic portion 5 is provided with an axially extending opening 57 . The elastic portion 5 includes two or more spring pieces 50 arranged in an annular array, with a gap 51 formed between two adjacent spring pieces 50 . The gap 51 between the spring pieces 50 provides deformation space for the elastic contraction and expansion of each spring piece 50 in the elastic portion 5 , thereby reducing installation difficulty and preventing damage to the spring pieces 50 during insertion.

[0079] Preferably, in this embodiment, the elastic portion 5 is provided with a total of four spring pieces 50, with a gap 51 between each adjacent spring piece 50, the gaps 51 being equal in size, and the four spring pieces 50 having the same area. It will be understood that in other embodiments, the number and area of ​​the spring pieces 50 and the size of the gaps 51 can be set according to usage requirements.

[0080] The interior of the elastic part 5 is hollow and an annular serration 53 is provided on the inner wall. The elastic part 5 can elastically expand to allow the plug-in end 32 of the insertion rod 3 to enter, and can contract to allow the annular serration 53 to abut against the plug-in end 32; the plug-in end 32 of the insertion rod 3 can extend into the elastic part 5 through the intermediate sleeve 4 along the insertion direction, and the elastic part 5 can elastically embrace the plug-in end 32; when the insertion rod 3 is subjected to a pulling force in the opposite direction of the insertion direction, the annular serration 53 of the elastic part 5 can bite and deform the plug-in end 32 and embed it into the plug-in end 32.

[0081] With such arrangement, the spring piece 50 of the elastic part 5 provided by the present invention can follow the insertion rod 3 into the middle sleeve 4 through elastic contraction, and the annular serrations 53 on the inner wall of the elastic part 5 are clamped on the plug-in end 32, effectively ensuring the connection reliability between the small sleeve 2 and the large sleeve 8. In addition, on the basis of being limited and clamped by the annular serrations 53 in the axial direction, the elastic part 5 can also apply a supporting force to the inner wall of the middle sleeve 4 in the radial direction through its own elasticity, further avoiding the risk of clamping failure between the annular serrations 53 and the plug-in end 32, thereby enhancing the connection reliability of the seamless connector 100. In addition, the seamless connector 100 provided by the present application has a simple overall structure and low production cost, can effectively enhance the connection strength between prefabricated piles, and has good application prospects and economic benefits.

[0082] More specifically, in this embodiment of the present invention, the annular serrations 53 are annular in shape. This arrangement provides a large engagement area between the annular serrations 53 and the plug end 32, making it less susceptible to breakage and failure, and making it easier to manufacture. It should be understood that due to the gaps 51 between the spring pieces 50 of the elastic portion 5, the annular serrations 53 are not completely continuous rings. The annular serrations 53 effectively engage the plug end 32 of the plug rod 3, and their hardness is greater than that of the plug rod 3. The overall surface hardness of the spring pieces 50 is relatively high, ranging from HRC 65 to 70, while the internal hardness is slightly lower, reducing brittleness.

[0083] The elastic part 5 and the plug end 32 are made of 20CrMnTi, and the Rockwell hardness of the plug end 32 is lower than the Rockwell hardness of the surface of the elastic part 5. Such a configuration facilitates the embedding of the annular serrations 53 into the plug end 32, further completing the meshing connection between the outer wall of the plug end 32 and the inner wall of the elastic part 5. The internal hardness of the elastic part 5 does not need to be consistent with the surface hardness, which reduces the demand for high-strength materials, is conducive to reducing the material cost required for the production of the elastic part 5, and reduces the probability of brittle fracture of the component.

[0084] The plug-in end 32 of the insertion rod 3 is provided with a chamfer 32-1. The elastic portion 5 also includes a guide bevel 55 located at the end of the elastic portion 5 closest to the intermediate sleeve 4. The chamfer 32-1 is designed to abut the guide bevel 55 and guide the radial expansion of the elastic portion 5. This arrangement, in which the chamfer 32-1 abuts the guide bevel 55, allows for smooth insertion of the plug-in end 32 and the elastic portion 5, facilitating the sliding of the plug-in end 32 along the guide bevel 55 into the elastic portion 5 and allowing for stable elastic expansion of the elastic portion 5.

[0085] Furthermore, there are multiple annular serrations 53, and the multiple annular serrations 53 are evenly distributed on the inner circumferential wall of the elastic part 5 along the axial direction. With such an arrangement, the multiple annular serrations 53 and the plug-in end 32 cooperate with each other to form multiple clamping surfaces, thereby increasing the clamping area between the plug-in end 32 and the elastic part 5, further strengthening the connection strength between the small sleeve 2 and the large sleeve 8, and reducing or avoiding the risk of damage and failure of the connection component 100 due to excessive pulling force.

[0086] More specifically, the thickness of the annular inclined surface 52 on the elastic portion 5 also gradually decreases from the outside to the inside. This arrangement can make the connection between the elastic portion 5 and the intermediate sleeve 4 smoother, reduce the force on the elastic portion 5 from being concentrated at the connection with the intermediate sleeve 4, and facilitate safer and more stable elastic contraction or expansion of the spring piece 50.

[0087] Referring again to Figure 5 , in one embodiment of the present invention, a smooth transition is formed between the annular inclined surface 52 and the outer peripheral wall of the spring piece 50. This arrangement facilitates the overall processing of the elastic portion 5 and ensures that the elastic portion 5 can easily enter the intermediate sleeve 4 along with the insertion rod 3, effectively improving the ease of insertion and facilitating the simultaneous docking of multiple seamless connectors 100.

[0088] Please refer to Figure 4 again. In one embodiment of the present invention, the inner wall of the intermediate sleeve 4 has a frustum 41 that gradually expands along the insertion direction, and the outer wall of the elastic part 5 is provided with an annular inclined surface 52 that matches the frustum 41; the plug-in end 32 can extend into the elastic part 5 through the intermediate sleeve 4 along the insertion direction, and the elastic part 5 can elastically embrace the plug-in end 32; such a configuration can make the connection between the annular inclined surface 52 of the elastic part 5 and the frustum 41 smoother, reduce the force of the elastic part 5 concentrated on the connection with the frustum 41, and facilitate the elastic contraction or elastic expansion of the spring piece 50 more safely and stably.

[0089] More specifically, the angle of inclination of the cone 41 matches that of the annular inclined surface 52. Thus, the inclined cone 41 of the intermediate sleeve 4 can provide a certain guiding effect and can cooperate with the insertion rod 3 so that the elastic portion 5 and the insertion rod 3 can more fully abut against the intermediate sleeve 4.

[0090] Please refer to Figure 5 again. In one embodiment of the present invention, a plurality of notches 54 are formed at one end of the elastic portion 5 away from the inclined surface 52, and the notches 54 are arranged alternately with the gaps 51; the plurality of notches 54 can provide deformation space for the elastic contraction and elastic expansion of each spring piece 50 of the elastic portion 5, reduce the difficulty of installation, and avoid damage to the spring piece 50 during the plugging process; preferably, in this embodiment, the elastic portion 5 is provided with a total of 4 notches 54, and the sizes of adjacent notches 54 are equal. It can be understood that in other embodiments, the number of notches 54 and the size of the gap 51 can be set according to usage requirements.

[0091] Specifically, the spring piece 50 is provided with a plurality of notches 54, which can reduce the elastic force of the spring piece 50, so that no particularly large force is required when the insertion rod 3 is inserted. At the same time, it is more convenient to assemble with the elastic abutment 6, thereby improving the assembly efficiency between the two. In this facility example, the elastic abutment 6 is a tendon pad 60.

[0092] The length of the notch 54 is consistent with that of the gap 51. Such a setting can ensure that the spring piece 50 has elastic force while enhancing the load-bearing capacity of the spring piece 50; when the spring piece 50 is subjected to pressure or tensile force, the spring piece 50 is not easy to break and fail, effectively improving the reliability of the connection component 100 after connecting to the prefabricated piles, and ensuring the connection strength between the prefabricated piles.

[0093] The extending direction of the notch 54 and the gap 51 is parallel to the axial direction of the elastic portion 5 ; in this arrangement, the notch 54 extends downward to the side wall of the elastic sheet 50 , ensuring that the elastic sheet 50 can be fully deformed during elastic expansion or contraction.

[0094] It is understandable that in other embodiments, the notch 54 may also extend downward in any direction, as long as there is sufficient space at the notch 54 for the elastic portion 5 to deform elastically.

[0095] Please refer to Figure 6 again. In one embodiment of the present invention, an annular groove 62 is formed on the tendon pad 60 to match the elastic part 5. The end of the elastic part 5 close to the notch 54 is inserted into the annular groove 62 for assembling the elastic part 5 to the tendon pad 60. The tendon pad 60 is a hollow cone, and the annular groove 62 is located at the outer end of the tendon pad 60, which can be installed in conjunction with the spring 50. The tendon pad 60 has a certain elasticity and can provide a certain displacement for the spring 50 when the rod 3 is inserted, and reset after the rod 3 is fully inserted; the annular groove 62 is used to limit the connection depth of the end of the elastic part 5 close to the notch 54 inserted into the tendon pad 60. With this arrangement, the annular groove 62 can effectively locate the installation position of the elastic part 5, avoid excessive assembly between the elastic part 5 and the tendon pad 60, and effectively improve the assembly accuracy.

[0096] Please refer to Figures 3, 4, 7, 8 and 9 again. In one embodiment of the present invention, the limiting sleeve 7 is a barrel-shaped structure with a sealed bottom and an open top; the limiting sleeve 7 is connected to the intermediate sleeve 4 and is built into the large sleeve 8; the limiting sleeve 7 is fixedly connected to the intermediate sleeve 4. Of course, the connection method between the limiting sleeve 7 and the intermediate sleeve 4 can be snap-on, screw-on, etc.

[0097] More specifically, the limiting sleeve 7 is a hollow cylinder with a closed lower end, and is used in conjunction with the intermediate sleeve 4. Specifically, the intermediate sleeve 4 includes a first connecting section 43 and a second connecting section 44 that are interconnected. The first connecting section 43 is located on a side of the second connecting section 44 that is relatively close to the small sleeve 2. The first connecting section 43 is formed with an external thread 40, which is connected to the large sleeve 8, and the second connecting section 44 is connected to the limiting sleeve 7. With this arrangement, the elastic portion 5 and the elastic abutment 6 can be pre-installed in the limiting sleeve 7. The limiting sleeve 7 and the second connecting section 44 are adapted to engage and prevent the elastic portion 5 and the elastic abutment 6 from falling out. The elastic portion 5, the elastic abutment 6, and the limiting sleeve 7 can form a pre-assembled structure with the intermediate sleeve 4 and be installed on the large sleeve 8 together with the intermediate sleeve 4. The pre-assembled structure facilitates the installation of the intermediate sleeve 4, simplifies on-site installation steps, and improves installation efficiency.

[0098] The bottom of the limiting sleeve 7 of the present invention is sealed, that is, the limiting sleeve 7 is a barrel-shaped structure with only an opening on the top, while the limiting sleeve of the seamless connector in the prior art has a hollow bottom and has openings on the top and bottom. Compared with the two, the beneficial effect of this patent is that sealing materials such as epoxy resin or sealing oil can be filled in the limiting sleeve in advance to facilitate subsequent assembly.

[0099] The outer diameter of the second connecting section 44 is smaller than that of the first connecting section 43. In other words, the second connecting section 44 and the first connecting section 43 form a stepped, integrally formed structure. The second connecting section 44 is embedded in the open end of the limiting sleeve 7. The upper end of the limiting sleeve 7 is deformed by annular compression, so that the upper end is embedded in the second connecting section 44 of the intermediate sleeve 4, and the two are adapted and snap-fitted. In this embodiment, the intermediate sleeve 4, the limiting sleeve 7, the elastic portion 5, and the tendon pad 60 are used in combination and are assembled before leaving the factory.

[0100] The second connecting section 44 is located inside the limiting sleeve 7; the radial dimension of the outer circumference of the second connecting section 44 matches the radial dimension of the inner circumference of the limiting sleeve 7. This arrangement reduces the gap between the limiting sleeve 7 and the outer circumference of the second connecting section 44, preventing the rod from shaking inside the large sleeve 8 when subjected to horizontal forces or bending moments.

[0101] More specifically, since the lower end of the limiting sleeve 7 is closed, an anti-corrosion solvent can be stored in the limiting sleeve 7 to prevent corrosion of the connection between the elastic abutment member 6 and the spring 50, thereby extending the service life of the entire device.

[0102] Preferably, the second connecting section 44 is annular, and an inner groove is opened in the middle of the second connecting section 44. With such an arrangement, the user can mechanically roll the intermediate sleeve 4 without affecting the limiting effect of the second connecting section 44 on the limiting sleeve 7. Before leaving the factory, the intermediate sleeve 4, the limiting sleeve 7, the elastic part 5, and the tendon pad 60 are pre-assembled accessories, so that the intermediate sleeve 4 can be connected with the limiting sleeve 7 more labor-saving and conveniently. In other words, the inner groove formed on the second connecting section 44 enables the necking part 42 to take into account the annular pressure deformation of the limiting sleeve 7, and to limit the degree of connection between the limiting sleeve 7 and the intermediate sleeve 4 and to facilitate the locking of the limiting sleeve 7.

[0103] When the cam 32 is in the closed position, the spring 53 is tightened to the spring 54 so that the cam 32 is tightened and the screw 53 is tightened, so that the cam 32 is tightened and the screw 53 is tightened. Example 2:

[0104] The connecting assembly includes: a small sleeve 2; a first internal thread 16 is formed inside the small sleeve; a first connecting cavity 21 and a second connecting cavity 22 are provided, a first partition plate 23 is formed between the first connecting cavity 21 and the second connecting cavity 22, and a first prestressed steel rod 1 is screwed into the first connecting cavity 21; a large sleeve 8 has a third connecting cavity 81 and a plug-in cavity; an internal thread 80 is formed in the plug-in cavity near one end of the small sleeve 2; a second partition plate 82 is formed between the third connecting cavity 81 and the plug-in cavity, and a second prestressed steel rod 9 is screwed into the third connecting cavity 81; an insert rod 3 has a T-shaped cross-section along the axial direction, a limiting protrusion 33 is formed at one axial end, and a plug-in end 32 that can be extended into the plug-in cavity is formed at the other end; an intermediate nut 10 has an external threaded connecting end 11 screwed to the small sleeve 2 on its outer side, and a plug-in end 32 that can be inserted into the plug-in cavity is formed on its inner side. A through hole 12 is formed for inserting the plug-in end 32, and the outer diameter of the plug-in end 32 is smaller than the inner diameter of the through hole 12. The intermediate nut 10 has a first end 13 and a second end 14 that are far away from each other; when the plug-in end 32 of the plug rod 3 is inserted into the intermediate nut 10, the first end 13 fits with the limiting protrusion 33; the intermediate sleeve 4 has an external thread 40 that is threadedly connected to the internal thread 80 of the large sleeve 8 and axially abuts the second end 14; the elastic part 5 is built into the large sleeve 8 to lock the plug-in end 32; the elastic abutment 6 is assembled with the elastic part 5 and is built into the limiting sleeve 7; the limiting sleeve 7 is a barrel-shaped structure with a sealed bottom and an open top; the limiting sleeve 7 is fixedly connected to the intermediate sleeve 4; it is built into the large sleeve 8; wherein the limiting sleeve 7 and the intermediate sleeve 4 can be fixedly connected or the two can be clamped to each other.

[0105] The interior of the elastic part 5 is hollow and an annular serration 53 is provided on the inner wall. The elastic part 5 can elastically expand to facilitate the insertion of the insertion rod 3, and can contract so that the annular serration 53 abuts against the plug end 32; the plug end 32 of the insertion rod 3 can extend into the elastic part 5 through the intermediate sleeve 4 along the insertion direction, and the elastic part 5 can elastically embrace the plug end 32; when the insertion rod 3 is subjected to a pulling force in the opposite direction of the insertion direction, the annular serration 53 of the elastic part 5 can bite and deform the plug end 32 and embed it into the plug end 32.

[0106] Please refer to Figure 12 again, and refer to Figures 13 to 18 together. Figure 12 is a structural schematic diagram of the connecting assembly of Example 2 of the present invention; Figure 13 is a front view of the connecting assembly of Example 2 of the present invention; Figure 14 is a CC sectional view of Figure 13 of Example 2 of the present invention; Figure 15 is a structural schematic diagram (I) of the small sleeve of Example 2 of the present invention; Figure 16 is a structural schematic diagram (II) of the small sleeve of Example 2 of the present invention; Figure 17 is a structural schematic diagram (I) of the large sleeve of Example 2 of the present invention; Figure 18 is a structural schematic diagram (II) of the large sleeve of Example 2 of the present invention.

[0107] Compared with the first embodiment, the second embodiment is characterized by improvements to the structures of the small sleeve 2 and the large sleeve 8.

[0108] Please refer to Figures 15 and 16, wherein the small sleeve 2 has a first connecting cavity 21 and a second connecting cavity 22, a first partition 23 is formed between the first connecting cavity 21 and the second connecting cavity 22, and a first prestressed steel rod 1 is screwed into the first connecting cavity 21.

[0109] Please refer to Figures 17 and 18, in which the large sleeve 8 has a third connecting cavity 81 and an inserting cavity; an internal thread 80 is formed in the inserting cavity near one end of the small sleeve 2; a second partition plate 82 is formed between the third connecting cavity 81 and the inserting cavity, and a second prestressed steel rod 9 is threaded into the third connecting cavity 81.

[0110] Compared with the small sleeve 2 and the large sleeve 8 in the first embodiment, this sleeve cancels the pier head limit and is replaced by a screw connection, and is closed in the middle, providing a limit for the screw connection, which can effectively improve the connection accuracy and the length accuracy of the prestressed steel rod. The design of the present invention is ingenious, and the improvement of the large and small sleeves and prestressed steel rods can effectively improve the assembly accuracy and improve product quality.

[0111] In addition, the connection component provided by the present application has a simple structure and is not easy to shake. After the connection component is plugged in, the internal shape is fixed. When subjected to a pulling force, relative sliding is not easy to occur between the two building structures, thereby improving the stability of the connection.

[0112] For other contents of this embodiment, refer to Example 1. Example 3:

[0113] Please refer to Figures 19 to 21. Figure 19 is a front view of a connection assembly according to a third embodiment of the present invention; Figure 20 is a CC sectional view of Figure 19 according to a third embodiment of the present invention; and Figure 21 is an exploded view of the structure of the connection assembly according to the third embodiment of the present invention.

[0114] Compared with the first embodiment, the third embodiment is characterized in that the elastic abutment member 6 is an elastic ring 61, which is arranged in the limiting sleeve 7. Specifically, the elastic ring 61 is located between the elastic portion 5 and the limiting sleeve 7. The elastic ring 61 is used to make the elastic portion 5 have a tendency to move in the opposite direction of the insertion direction.

[0115] Please refer to Figure 21, in which a through hole is formed in the middle of the elastic ring 61. With this arrangement, the elastic ring 61 can push the elastic part 5 to move in the opposite direction of the insertion direction, so that the annular inclined surface 52 of the elastic part 5 is further close to the frustum 41 of the intermediate sleeve 4. When the plug-in end 32 is subjected to a pulling force, the frustum 41 and the annular inclined surface 52 can quickly abut against each other, which is beneficial to reducing the impact of the impact load.

[0116] For other contents of this embodiment, refer to Example 1 or Example 2. Example 4:

[0117] Please refer to Figures 22 to 24, Figure 22 is a main view of the connection between the intermediate sleeve and the limiting sleeve in the fourth embodiment of the present invention; Figure 23 is an EE sectional view of Figure 22 in the fourth embodiment of the present invention; Figure 24 is a schematic diagram of the connection between the elastic part and the oil seal in the fourth embodiment of the present invention.

[0118] Compared with embodiment 1, the fourth embodiment of the present invention is characterized in that: the elastic part 5 is equipped with an oil seal 56 near the opening 57 of the intermediate sleeve 4, and the oil seal 56 is located around the connection between the intermediate sleeve 4 and the limiting sleeve 7; specifically, the upper end of the limiting sleeve 7 is deformed by annular pressure so that the upper end is embedded in the necking portion 42 of the intermediate sleeve 4, and the two are adapted to be clamped and connected, so as to clamp and seal the oil seal 56 and maintain the sealing state. Sealing oil is filled in the limiting sleeve 7, and then the oil seal 56 is laid on the guide inclined surface 55 at the opening 57 of the elastic part 5. The oil seal 56 is used to cover the elastic part 5 to avoid overflow of the sealing oil in the limiting sleeve 7, thereby ensuring safety in use. More specifically, the oil seal 56 is one of nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane or polytetrafluoroethylene.

[0119] For other contents of this embodiment, refer to Example 1, Example 2 or Example 3. Embodiment 5:

[0120] Please refer to Figure 25, which is a structural diagram of the elastic part in Example 5 of the present invention.

[0121] Compared with the first embodiment, the fifth embodiment is characterized in that the extension direction of the notch 54 and the gap 51 has a certain inclination angle with the axial direction of the elastic portion 5; in this way, the notch 54 extends downward to the side wall of the spring piece 50, ensuring that the spring piece 50 can be fully deformed during elastic expansion or contraction.

[0122] For other contents of this embodiment, refer to Example 1, Example 2, Example 3 or Example 4.

[0123] Example 6:

[0124] Please refer to Figures 26 to 28, Figure 26 is a main view of the connection between the middle nut, the plug rod and the gasket in the sixth embodiment of the present invention; Figure 27 is an FF sectional view of Figure 26 in the sixth embodiment of the present invention; Figure 28 is a structural schematic diagram of the gasket in the sixth embodiment of the present invention.

[0125] Compared with embodiment 1 or embodiment 2, the distinguishing feature of embodiment 6 is that a buffer assembly 70 is provided between the intermediate nut 10 and the limiting protrusion 33 of the insertion rod 3, and the buffer assembly 70 includes a gasket 71, and a connecting through hole 72 is provided in the gasket 71 for the insertion end 32 to pass through; such a setting facilitates the gasket 71 to be safely and stably assembled between the intermediate nut 10 and the limiting protrusion 33, reduces the stress concentration between the intermediate nut 10 and the limiting protrusion 33, and thereby extends the service life of the insertion rod 3.

[0126] Among them, the outer end faces of the gasket 71, the intermediate nut 10 and the limiting protrusion 33 are on the same horizontal line, and the end of the gasket 71 close to the limiting protrusion 33 has a first limiting groove 73 that gradually shrinks along the insertion direction. Correspondingly, the limiting protrusion 33 is provided with a protrusion 74 that cooperates with the first limiting groove 73; the plug-in end 32 can be inserted into the gasket 71 and the intermediate nut 10 in sequence along the insertion direction, and the protrusion 74 of the limiting protrusion 33 fits on the first limiting groove 73 of the gasket 71.

[0127] The protrusion 74, the limiting protrusion 33 and the plug end 32 are an integrally formed structure; such a configuration improves the structural strength and overall firmness of the plug rod 3, further ensuring safety in use.

[0128] The axial height of the protrusion 74 is consistent with the axial height of the limiting protrusion 33; such an arrangement allows the protrusion 74 to expand the range of influence on the fitting of the peripheral wall of the first limiting groove 73 of the gasket 71 during the assembly process with the first limiting groove 73, making it easier for the protrusion 74 to be assembled into the first limiting groove 73. At the same time, it also ensures that there is sufficient anti-stress concentration capability between the protrusion 74 and the first limiting groove 73.

[0129] The cross-sectional shape of the protrusion 74 and the first limiting groove 73 is circular, arc-shaped, elliptical, conical, square or trapezoidal; in this embodiment, the cross-sectional shape of the protrusion 74 and the first limiting groove 73 is circular. Such a setting not only maintains the effective range of the protrusion 74 and the first limiting groove 73, but also reduces the stress concentration caused by the first limiting groove 73, thereby avoiding the breakage of the insertion rod 3.

[0130] The present invention can effectively avoid stress concentration between the middle nut and the insertion rod by assembling a gasket between the middle nut and the limiting protrusion and providing a protrusion at the bottom of the limiting protrusion, thereby extending the service life of the connection component.

[0131] For other contents of this embodiment, refer to Example 1, Example 2, Example 3, Example 4 or Example 5.

[0132] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

[0133] Although this article uses more reference numerals in the figures: first prestressed steel rod 1, small sleeve 2, plug rod 3, intermediate sleeve 4, elastic portion 5, elastic abutment 6, limiting sleeve 7, large sleeve 8, second prestressed steel rod 9, intermediate nut 10, external threaded connection end 11, through hole 12, first end 13, second end 14, first protrusion 15, first internal thread 16, first connecting cavity 21, second connecting cavity 22, first partition 23, external threaded connection end 31, plug end 32, chamfer 32-1, limiting protrusion 33 , external thread 40, frustum 41, first connecting section 43, second connecting section 44, spring piece 50, gap 51, annular inclined surface 52, annular serration 53, notch 54, guide inclined surface 55, oil seal 56, opening 57, tendon washer 60, spring ring 61, annular groove 62, buffer assembly 70, gasket 71, connecting through hole 72, first limiting groove 73, protrusion 74, internal thread 80, third connecting cavity 81, second partition 82, connecting assembly 100 and other terms, but the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A connection assembly, characterized in that: include: A small sleeve (2) having a first internal thread (16) formed therein; The large sleeve (8) has an inserting cavity formed therein, and an internal thread (80) is formed in the inserting cavity near one end of the small sleeve (2); The insertion rod (3) has a T-shaped cross-section along the axial direction, a limiting protrusion (33) is formed at one axial end thereof, and an insertion end (32) that can be extended into the insertion cavity is formed at the other end thereof; A limiting structure, built into the small sleeve (2), used to limit the limiting protrusion (33) of the insertion rod (3) from escaping upward from the small sleeve (2); The intermediate nut (10) has an external threaded connection end (11) on the outer side thereof which is threadedly connected to the first internal thread (16) of the small sleeve (2), and a through hole (12) is formed inside thereof for the insertion end (32) to be inserted, the outer diameter of the insertion end (32) is smaller than the inner diameter of the through hole (12), and the intermediate nut (10) has a first end (13) and a second end (14) which are separated from each other; when the insertion end (32) of the insertion rod (3) is inserted into the intermediate nut (10), the first end (13) is in contact with the limiting protrusion (33); An intermediate sleeve (4) having an external thread (40) threadedly connected to the internal thread (80) of the large sleeve (8) and axially abutting against the second end portion (14); An elastic portion (5) is built into the large sleeve (8) and is used to lock the plug end (32); An elastic abutment member (6) is assembled in cooperation with the elastic portion (5) and is built into the limiting sleeve (7); The limiting sleeve (7) is a barrel-shaped structure with a sealed bottom and an open top; it is fixedly connected to the middle sleeve (4); and is built into the large sleeve (8); The interior of the elastic part (5) is hollow and an annular serration (53) is provided on the inner wall. The elastic part (5) can elastically expand to facilitate the insertion of the insertion rod (3), and can contract so that the annular serration (53) abuts against the plug-in end (32). The plug-in end (32) of the insertion rod (3) can extend into the elastic part (5) along the insertion direction via the intermediate sleeve (4), and the elastic part (5) can elastically hold the plug-in end (32). When the insertion rod (3) is subjected to a pulling force in the opposite direction of the insertion direction, the annular serration (53) of the elastic part (5) can bite and deform the plug-in end (32) and embed it into the plug-in end (32).

2. The connection assembly according to claim 1, characterized in that: The elastic part (5) comprises two or more elastic sheets (50) distributed in an annular array, a gap (51) extending in the axial direction is formed between two adjacent elastic sheets (50), and the elastic part (5) can radially expand or contract through the gap (51).

3. The connection assembly according to claim 1, characterized in that: The elastic part (5) and the plug end (32) are made of 20CrMnTi, and the Rockwell hardness of the plug end (32) is smaller than the Rockwell hardness of the surface of the elastic part (5).

4. The connection assembly according to claim 1, characterized in that: The plug-in end (32) of the plug rod (3) is provided with a chamfer (32-1), and the elastic portion (5) further comprises a guiding inclined surface (55), the guiding inclined surface (55) being located at an end of the elastic portion (5) relatively close to the intermediate sleeve (4), and the chamfer (32-1) being used to abut against the guiding inclined surface (55) and guide the elastic portion (5) to expand radially.

5. The connection assembly according to claim 1 or 4, characterized in that: The inner wall of the intermediate sleeve (4) has a truncated cone (41) that gradually expands along the insertion direction, and the outer wall of the elastic part (5) is provided with an annular inclined surface (52) that matches the truncated cone (41); the plug-in end (32) can extend into the elastic part (5) through the intermediate sleeve (4) along the insertion direction, and the elastic part (5) can elastically embrace the plug-in end (32).

6. The connection assembly according to claim 1, characterized in that: A plurality of notches (54) are formed at one end of the elastic portion (5) away from the inclined surface (52), and the notches (54) and the gaps (51) are arranged in an alternating manner.

7. The connection assembly according to claim 6, characterized in that: The extending direction of the notch (54) and the gap (51) is parallel to the axial direction of the elastic portion (5); or, there is a certain inclination angle between the extending direction of the notch (54) and the gap (51) and the axial direction of the elastic portion (5).

8. The connection assembly according to claim 1, characterized in that: The number of the annular saw teeth (53) increases sequentially along the insertion direction of the plug end (32).

9. The connection assembly according to claim 1, characterized in that: An end of the elastic portion (5) relatively close to the middle nut (10) smoothly transitions to the inner wall of the middle sleeve (4).

10. The connection assembly according to claim 9, characterized in that: The intermediate sleeve (4) comprises a first connecting section (43) and a second connecting section (44) which are connected to each other. The first connecting section (43) is located on a side of the second connecting section (44) relatively close to the small sleeve (2). An external thread (40) is formed on the first connecting section (43). The external thread (40) of the first connecting section (43) is connected to the large sleeve (8), and the second connecting section (44) is connected to the limiting sleeve (7).

11. The connection assembly according to claim 10, characterized in that: The second connecting section (44) is located on the inner side of the limiting sleeve (7); the radial dimension of the outer peripheral wall of the second connecting section (44) matches the radial dimension of the inner peripheral wall of the limiting sleeve (7).

12. The connection assembly according to claim 1, characterized in that: A first protrusion (15) is also provided on the outer peripheral wall of the second end portion (14); the first protrusion (15) and the second end portion (12) are on the same horizontal plane; the first protrusion (15) and the intermediate nut (10) are integrally formed.

13. The connection assembly according to claim 12, characterized in that: The outer diameter of the first protrusion (15) is larger than the inner diameter of the small sleeve (2) and the inner diameter of the middle sleeve (4), and the two sides of the first protrusion (13) can respectively abut against the end of the small sleeve (2) and the end of the middle sleeve (4).

14. The connection assembly according to claim 13, characterized in that: The outer peripheral wall of the first protrusion (15) is a non-circular structure.

15. A connection assembly, characterized in that: include: Small sleeve (2); A first internal thread (16) is formed inside the inner portion; It comprises a first connecting cavity (21) and a second connecting cavity (22), a first partition plate (23) is formed between the first connecting cavity (21) and the second connecting cavity (22), and a first prestressed steel rod (1) is screwed into the first connecting cavity (21); The large sleeve (8) has a third connecting cavity (81) and an inserting cavity; an internal thread (80) is formed in the inserting cavity near one end of the small sleeve (2); a second partition plate (82) is formed between the third connecting cavity (81) and the inserting cavity, and a second prestressed steel rod (9) is threadedly connected in the third connecting cavity (81); The insertion rod (3) has a T-shaped cross-section along the axial direction, a limiting protrusion (33) is formed at one axial end thereof, and an insertion end (32) that can be extended into the insertion cavity is formed at the other end thereof; The intermediate nut (10) has an external threaded connection end (11) on its outer side which is threadedly connected to the small sleeve (2), and a through hole (12) is formed inside the intermediate nut for inserting the plug end (32). The outer diameter of the plug end (32) is smaller than the inner diameter of the through hole (12). The intermediate nut (10) has a first end (13) and a second end (14) which are separated from each other. When the plug end (32) of the plug rod (3) is inserted into the intermediate nut (10), the first end (13) is in contact with the limiting protrusion (33). An intermediate sleeve (4) having an external thread (40) threadedly connected to the internal thread (80) of the large sleeve (8) and axially abutting against the second end portion (14); An elastic portion (5) is built into the large sleeve (8) and is used to lock the plug end (32); An elastic abutment member (6) is assembled in cooperation with the elastic portion (5) and is built into the limiting sleeve (7); The limiting sleeve (7) is a barrel-shaped structure with a sealed bottom and an open top; it is fixedly connected to the middle sleeve (4); and is built into the large sleeve (8); The interior of the elastic part (5) is hollow and an annular serration (53) is provided on the inner wall. The elastic part (5) can elastically expand to facilitate the insertion of the insertion rod (3), and can contract so that the annular serration (53) abuts against the plug-in end (32). The plug-in end (32) of the insertion rod (3) can extend into the elastic part (5) along the insertion direction via the intermediate sleeve (4), and the elastic part (5) can elastically hold the plug-in end (32). When the insertion rod (3) is subjected to a pulling force in the opposite direction of the insertion direction, the annular serration (53) of the elastic part (5) can bite and deform the plug-in end (32) and embed it into the plug-in end (32).

16. The connection assembly according to claim 1 or 15, characterized in that: The elastic abutment member (6) comprises a tendon pad (60) or an elastic ring (61); the tendon pad (60) or the elastic ring (61) is arranged in the limiting sleeve (7).

17. The connection assembly according to claim 16, characterized in that: The tendon pad (60) is formed with an annular groove (62) adapted to the elastic part (5), and one end of the elastic part (5) close to the notch (54) is inserted into the annular groove (62) for assembling the elastic part (5) onto the tendon pad (6).

18. The connection assembly according to claim 16, characterized in that: The elastic ring (61) is located between the elastic portion (5) and the limiting sleeve (7), and the elastic ring (61) is used to enable the elastic portion (5) to have a tendency to move in the opposite direction along the insertion direction.

19. The connection assembly according to claim 16, characterized in that: An oil seal (56) is mounted on the elastic portion (5) near the opening (57) of the middle sleeve (4), and the periphery of the oil seal (56) is located at the connection between the middle sleeve (4) and the limiting sleeve (7).

20. The connection assembly according to claim 19, characterized in that: The oil seal (56) is made of nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane or polytetrafluoroethylene.

21. The connection assembly according to claim 1 or 15, characterized in that: It also includes a buffer assembly (70), which is assembled between the middle nut (10) and the limiting protrusion (33) of the insertion rod (3).

22. The connection assembly according to claim 21, characterized in that: The buffer assembly (70) comprises a gasket (71), and a connecting through hole (72) for the plug end (32) to pass through is provided in the gasket (71).

23. The connection assembly according to claim 21, characterized in that: The outer end surfaces of the gasket (71), the middle nut (10) and the limiting protrusion (33) are on the same horizontal line.

24. The connection assembly according to claim 21, characterized in that: The gasket (71) has a first limiting groove (73) which gradually shrinks along the insertion direction at one end close to the limiting protrusion (33), and correspondingly, the limiting protrusion (33) is provided with a protrusion (74) which matches the first limiting groove (73); the plug-in end (32) can be inserted into the gasket (71) and the intermediate nut (10) in sequence along the insertion direction, and the protrusion (74) of the limiting protrusion (33) fits on the first limiting groove (73) of the gasket (71).

25. The connection assembly according to claim 24, characterized in that: The protrusion (74), the limiting protrusion (33) and the plug-in end (32) are an integrally formed structure.

26. The connection assembly according to claim 24, characterized in that: The height of the protrusion (74) along the axial direction is consistent with the height of the limiting protrusion (33) along the axial direction.

27. The connection assembly according to claim 24, characterized in that: The cross-sectional shapes of the protrusion (74) and the first limiting groove (73) are circular, arc-shaped, elliptical, conical, square or trapezoidal.

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