Seamless connector

Abstract

A seamless connector, comprising a small sleeve (2) inside which a first internal thread (10) is formed; a large sleeve (8) inside which an insertion connection cavity is formed, an internal thread (80) being formed in the insertion connection cavity at the end close to the small sleeve (2); an insertion rod (3), an axial end of the insertion rod being provided with an external-thread connection end (31) in threaded connection with the small sleeve (2), and an insertion connection end (32) capable of extending into the insertion connection cavity being formed at the other end of the insertion rod; an intermediate sleeve (4), which has an external thread (40) in threaded connection to the internal thread (80) of the large sleeve and axially abuts against the small sleeve (2); an elastic portion (5), which is arranged in the large sleeve (8) for locking the insertion connection end (32); an elastic abutting member (6), which is fitted and assembled with the elastic portion (5) and is arranged in a limiting sleeve (7); and the limiting sleeve (7), which is snap-fitted with the intermediate sleeve (4), and is arranged in the large sleeve (8). The seamless connector has a simple structure; an improvement in the intermediate sleeve (4) and the limiting sleeve (7) can simplify the assembly, thus reducing the cost; and the seamless connector is a pre-assembled member, and is convenient to manage.

Description

A seamless connector Technical Field

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

[0002] In the field of construction technology, in order to facilitate production and processing and reduce construction time, reinforced concrete precast piles are often spliced ​​together to ensure the length of the precast piles. In order to enable two reinforced concrete precast piles to be quickly and firmly connected, seamless connectors are generally used to connect the steel bars inside the two reinforced concrete precast piles; the middle sleeve of the original seamless connector is a multi-section thread, which is difficult to manufacture and cumbersome to install, and the multi-section thread may cause the threads to loosen, affecting the stability of the connector. At the same time, the bottom of the existing limiting sleeve is a hollow structure, and the sealing material must be filled into it after the limiting sleeve is installed in the large sleeve, which brings inconvenience to the subsequent assembly and affects the assembly efficiency. In addition, the existing sleeves are mostly combined with the prestressed steel rod pier head. Due to the low precision of the pier head, there are prestressed steel rods of different lengths, which affects the quality of the pile body.

[0003] In view of the above problems, it is necessary to improve them. Technical issues

[0004] The present invention aims to overcome the above-mentioned defects in the prior art and provide a seamless connector with a simple structure, reasonable design, stable connection and improved pile quality. Technical Solutions

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: a seamless connector, comprising: a small sleeve; a first internal thread formed in the interior of the large sleeve; a plug-in cavity formed in the interior of the large sleeve, and an internal thread formed in the plug-in cavity near one end of the small sleeve; an insert rod, one axial end of which has an external threaded connection end screwed to the first internal thread of the small sleeve, and the other end forms a plug-in end that can be extended into the plug-in cavity; an intermediate sleeve, having an external thread screwed to the internal thread of the large sleeve and axially abutting the small sleeve; an elastic part, built into the large sleeve to lock the plug-in end; an elastic abutment, assembled in conjunction with the elastic part, and built into the limit The inner wall of the elastic part is hollow and provided with annular serrations, and the elastic part can elastically expand to facilitate the insertion of the plug rod, and can contract so that the annular serrations abut against the plug end; the plug end of the plug rod can extend into the elastic part through the intermediate sleeve along the insertion direction, and the elastic part can elastically hold the plug end; when the plug rod is subjected to a pulling force in the opposite direction of the insertion direction, the annular serrations of the elastic part can bite and deform the plug end and embed it into the plug end.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] As a preferred solution of the present invention, the number of the annular serrations increases sequentially along the insertion direction of the plug end.

[0013] As a preferred solution of the present invention, the elastic portion has an end relatively close to the small sleeve and a smooth transition to the inner wall of the middle sleeve.

[0014] 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.

[0015] 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.

[0016] A seamless connector, comprising: a small sleeve; a first internal thread formed inside the sleeve; a first connecting cavity and a second connecting cavity, a first partition formed between the first connecting cavity and the second connecting cavity, a first prestressed steel rod being screwed in the first connecting cavity; a large sleeve, comprising a third connecting cavity and an inserting cavity; an internal thread formed in the inserting cavity near one end of the small sleeve; a second partition formed between the third connecting cavity and the inserting cavity, a second prestressed steel rod being screwed in the third connecting cavity; an inserting rod, one axial end of which has an external threaded connecting end screwed in with the first internal thread of the small sleeve, and the other end of which forms an inserting end that can be extended into the inserting cavity; an intermediate sleeve, having an external thread screwed in with the internal thread of the large sleeve and axially abutting against the small sleeve; an elastic portion built into the The large sleeve is used to lock the plug-in end; the elastic abutment is assembled with the elastic part and is built into the limiting sleeve; the limiting sleeve is a barrel-shaped structure with a sealed bottom and an open top; it is fixedly connected to the intermediate sleeve; it is built into the large sleeve; the interior of the elastic part is hollow and annular serrations are provided on the inner wall, the elastic part can elastically expand to facilitate the insertion of the rod, and can contract so that the annular serrations abut against the plug-in end; the plug-in end of the rod can extend into the elastic part through the intermediate sleeve along the insertion direction, and the elastic part can elastically hold the plug-in end; when the rod is subjected to a pulling force in the opposite direction of the insertion direction, the annular serrations of the elastic part can bite and deform the plug-in end and embed it into the plug-in end.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] As a preferred embodiment of the present invention, the oil seal is made of nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane or polytetrafluoroethylene. Beneficial effects

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention has a simple structure, and the improvement of the intermediate sleeve and the limiting sleeve can simplify assembly and reduce costs. Moreover, it is a pre-assembled part, which is convenient for management.

[0024] 2. The present invention is cleverly designed, and the improvements to the large and small sleeves and prestressed steel rods can effectively improve assembly accuracy and enhance product quality.

[0025] 3. The seamless connector provided by the present invention is simple to process, convenient to assemble, has reliable connection strength, can effectively reduce construction costs and engineering time, and has good economic benefits.

[0026] 4. The bottom of the limiting sleeve of the present invention is sealed, that is, the limiting sleeve 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic structural diagram of a seamless connector according to a first embodiment of the present invention;

[0028] FIG2 is a front view of a seamless connector according to a first embodiment of the present invention;

[0029] FIG3 is a cross-sectional view taken along line AA of FIG2 in accordance with the first embodiment of the present invention;

[0030] FIG4 is a schematic structural diagram of an intermediate sleeve in Embodiment 1 of the present invention;

[0031] FIG5 is a schematic structural diagram of the elastic portion in Example 1 of the present invention;

[0032] FIG6 is a schematic structural diagram of a tendon pad in Example 1 of the present invention;

[0033] FIG7 is an exploded view of the structure of the seamless connector in Example 1 of the present invention;

[0034] FIG8 is a front view of the connection between the limiting sleeve and the intermediate sleeve in the first embodiment of the present invention;

[0035] FIG9 is a sectional view taken along line BB of FIG8 in accordance with the first embodiment of the present invention;

[0036] 10 is a schematic structural diagram of a seamless connector according to Embodiment 2 of the present invention;

[0037] 11 is a front view of a seamless connector according to embodiment 2 of the present invention;

[0038] FIG12 is a cross-sectional view taken along line CC of FIG11 in the second embodiment of the present invention;

[0039] Figure 13 is a schematic diagram of the structure of the small sleeve in Example 2 of the present invention (I);

[0040] Figure 14 is a schematic diagram of the structure of the small sleeve in embodiment 2 of the present invention (II);

[0041] Figure 15 is a schematic diagram of the structure of the large sleeve in Example 2 of the present invention (I);

[0042] Figure 16 is a schematic diagram of the structure of the large sleeve in Example 2 of the present invention (II);

[0043] 17 is a front view of a seamless connector according to embodiment 3 of the present invention;

[0044] FIG18 is a DD cross-sectional view of FIG17 in the third embodiment of the present invention;

[0045] FIG19 is an exploded view of the structure of the seamless connector in the third embodiment of the present invention;

[0046] 20 is a front view of the connection between the intermediate sleeve and the limiting sleeve in the fourth embodiment of the present invention;

[0047] FIG21 is a cross-sectional view taken along line EE of FIG20 in accordance with the fourth embodiment of the present invention;

[0048] FIG22 is a schematic diagram of the connection between the elastic portion and the oil seal in the fourth embodiment of the present invention;

[0049] 23 is a schematic structural diagram of the elastic portion of Example 5 of the present invention;

[0050] Explanation of the accompanying drawings: first prestressed steel rod 1, small sleeve 2, inserted rod 3, middle sleeve 4, elastic part 5, elastic abutment 6, limiting sleeve 7, large sleeve 8, second prestressed steel rod 9, first internal thread 10, first connecting chamber 21, second connecting chamber 22, first partition 23, external thread connecting end 31, plug-in end 32, chamfer 32-1, external thread 40, frustum 41, first connecting section 43, second connecting section 44, spring piece 50, gap 51, annular inclined surface 52, annular serrations 53, notch 54, guide inclined surface 55, oil seal 56, opening 57, tendon pad 60, elastic ring 61, annular groove 62, internal thread 80, third connecting chamber 81, second partition 82, seamless connector 100. Modes for Carrying Out the Invention

[0051] 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0052] 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.

[0053] Currently, in the field of construction technology, in order to facilitate processing and construction, reinforced concrete precast piles are usually spliced ​​together to increase the total length of the precast piles. In order to enable two reinforced concrete precast piles to be quickly and firmly spliced ​​together, the existing technology generally uses connecting components to connect the steel bars inside the two reinforced concrete precast piles. However, when multiple existing connecting components are docked together, it is easy to cause the docking to be not smooth or some connecting components to be misaligned, making it difficult to ensure the connection efficiency and connection strength. Moreover, the middle sleeve of the original seamless connector has multiple sections of threads, which are difficult to manufacture and cumbersome to install. In addition, the multiple sections of threads may cause the threads to become loose, affecting the stability of the connector. Example

[0054] With this in mind, refer to Figure 1, which illustrates a three-dimensional schematic diagram of a seamless connector according to a first embodiment of the present invention. The present invention provides a seamless connector 100 for connecting two engineering components. In this embodiment, seamless connector 100 connects the rebar of different reinforced concrete precast piles to achieve an assembly extension between two precast piles (not shown). It is understood that in other embodiments, seamless connector 100 may also be used in other engineering fields, such as prefabricated buildings and poured concrete.

[0055] Please refer to Figure 1 again, and refer to Figures 2 to 7 together. Figure 2 is a main view of the seamless connector in Example 1 of the present invention; Figure 3 is an AA sectional view of Figure 2 in Example 1 of the present invention; Figure 4 is a structural schematic diagram of the intermediate sleeve in Example 1 of the present invention; Figure 5 is a structural schematic diagram of the elastic part in Example 1 of the present invention; Figure 6 is a structural schematic diagram of the tendon pad in Example 1 of the present invention; and Figure 7 is a structural decomposition diagram of the seamless connector in Example 1 of the present invention.

[0056] A seamless connector comprises: a small sleeve 2; a first internal thread 10 is formed inside it; a large sleeve 8, an insert cavity is formed inside it, and an internal thread 80 is formed in the insert cavity near one end of the small sleeve 2; an insert rod 3, one axial end of which has an external threaded connection end 31 screwed to the first internal thread 10 of the small sleeve 2, and the other end forms a plug end 32 that can be extended into the insert cavity; an intermediate sleeve 4, having an external thread 40 screwed to the internal thread 80 of the large sleeve 8 and axially abutting the small sleeve 2; an elastic part 5, built into the large sleeve 8 to lock the plug end 32; an elastic abutment 6, assembled with the elastic part 5, and built into the limiting sleeve 7; the limiting sleeve 7, which is a barrel-shaped structure with a sealed bottom and an open top; it is connected to the intermediate sleeve 4; and 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 preassembled part for easy management.

[0057] Among them, 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 hold the plug-in end 32; specifically, the upper end of the insertion rod 3 is a screw thread, and is engaged with the inner teeth of the small sleeve 2, and the lower end is the plug-in end 32, which is slightly smaller than the large-diameter inner hole of the intermediate sleeve 4, and the lower end of the plug-in end 32 is a rounded corner, so that it can enter the engaged intermediate sleeve 4 more smoothly.

[0058] Specifically, when connecting two precast piles (not shown), the two ends of the insertion rod 3 are respectively connected to the small sleeve 2 and the middle sleeve 4, and then 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 precast pile; further, the middle sleeve 4 is 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 precast pile. The ends of the two precast piles equipped with partial seamless connectors are butt-jointed to achieve a quick connection between the two precast piles and to lengthen the pile body; this embodiment is not limited to the connection of two precast piles, and can also be used in other similar components.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 seamless connector 100 due to excessive pulling force.

[0069] An annular inclined surface 52 is formed on the side of the elastic portion 5 that is closest to the intermediate sleeve 4. The outer diameter of this inclined surface 52 gradually decreases from the outside to the inside. A smooth transition forms between this annular inclined surface 52 and the outer circumference of the spring 50. This arrangement makes the outer circumference of the elastic portion 5 smoother overall, making it easier to insert into the intermediate sleeve 4 as the insertion rod 3 is inserted, effectively improving insertion convenience.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] The end of the elastic portion 5 that is relatively close to the small sleeve 2 smoothly transitions to the inner wall of the intermediate sleeve 4. This arrangement ensures that the plug end 32 will not encounter significant obstruction when inserted into the intermediate sleeve 4, and also avoids stress concentration caused by uneven contact between the plug end 32, the intermediate sleeve 4 and the elastic portion 5 during insertion.

[0075] 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.

[0076] 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.

[0077] 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 seamless connector 100 after connecting the prefabricated piles, and ensuring the connection strength between the prefabricated piles.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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; it is connected to the intermediate sleeve 4; and is built into the large sleeve 8; wherein the connection between the limiting sleeve 7 and the intermediate sleeve 4 can be a fixed connection or a mutual clamping connection between the two.

[0082] 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 can be pre-installed in the limiting sleeve 7, and the limiting sleeve 7 and the second connecting section 44 are adapted to be engaged to prevent the elastic portion 5 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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

[0089] In current construction technology, reinforced concrete precast piles are often spliced ​​together to increase their total length for ease of processing and construction. To ensure quick and secure splicing between two reinforced concrete precast piles, existing sleeves are often assembled with prestressed steel rod pier heads. However, due to the low precision of the pier heads, the prestressed steel rods may have varying lengths, impacting pile quality. A seamless connector was developed.

[0090] Specifically, a seamless connector includes: a small sleeve 2, which has a first internal thread 10 formed therein; 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; a large sleeve 8, which 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 82 is formed between the third connecting cavity 81 and the plug-in cavity, and the third connecting cavity 81 is screwed into the first prestressed steel rod 1. A second prestressed steel rod 9 is screwed into the cavity 81; the insertion rod 3 has an external threaded connection end 31 at one axial end that is screwed to the first internal thread 10 of the small sleeve 2, and the other end forms a plug end 32 that can be inserted into the insertion cavity; the intermediate sleeve 4 has an external thread 40 that is screwed to the internal thread 80 of the large sleeve 8 and axially abuts against the small sleeve 2; the elastic part 5 is built into the large sleeve 8 to lock the plug end 32; the tendon washer 60 is assembled with the elastic part 5 and built into the limiting sleeve 7;

[0091] The limiting sleeve 7 is a barrel-shaped structure with a sealed bottom and an open top; it is connected to the middle sleeve 4; and is built into the large sleeve 8, wherein the connection between the limiting sleeve 7 and the middle sleeve 4 can be a fixed connection or a mutual clamping connection between the two.

[0092] The plug-in end 32 can be extended into the elastic part 5 through the intermediate sleeve 4 along the insertion direction, and the elastic part 5 can elastically hold the plug-in end 32; 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 be extended into the elastic part 5 through the intermediate sleeve 4 along the insertion direction, 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 insertion rod 3 can bite and deform the plug-in end 32 and embed it into the plug-in end 32.

[0093] Please refer to Figure 10 again, and refer to Figures 11 to 16 together. Figure 10 is a structural schematic diagram of the seamless connector in Example 2 of the present invention; Figure 11 is a front view of the seamless connector in Example 2 of the present invention; Figure 12 is a CC sectional view of Figure 11 in Example 2 of the present invention; Figure 13 is a structural schematic diagram (one) of the small sleeve in Example 2 of the present invention; Figure 14 is a structural schematic diagram (two) of the small sleeve in Example 2 of the present invention; Figure 15 is a structural schematic diagram (one) of the large sleeve in Example 2 of the present invention; Figure 16 is a structural schematic diagram (two) of the large sleeve in Example 2 of the present invention.

[0094] 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.

[0095] Please refer to Figures 13 and 14, 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.

[0096] Please refer to Figures 15 and 16, 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.

[0097] 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.

[0098] In addition, the seamless connector provided in this application has a simple structure and is not easy to shake. After the seamless connector is plugged in, the internal shape is fixed. When subjected to pulling force, relative sliding is not easy to occur between the two building structures, thereby improving the stability of the connection.

[0099] For other contents of this embodiment, refer to Example 1. Example

[0100] Please refer to Figures 17 to 19, Figure 17 is a main view of the seamless connector in Example 3 of the present invention; Figure 18 is a DD sectional view of Figure 17 in Example 3 of the present invention; Figure 19 is a structural decomposition diagram of the seamless connector in Example 3 of the present invention.

[0101] Compared with embodiment 1, the third embodiment is distinguished 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 part 5 and the limiting sleeve 7, and the elastic ring 61 is used to make the elastic part 5 have a tendency to move in the opposite direction along the insertion direction.

[0102] Please refer to Figure 19, 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 reduce the impact of the impact load.

[0103] For other contents of this embodiment, refer to Example 1 or Example 2. Example

[0104] Please refer to Figures 20 to 22, Figure 20 is a main view of the connection between the intermediate sleeve and the limiting sleeve in the fourth embodiment of the present invention; Figure 21 is an EE sectional view of Figure 20 in the fourth embodiment of the present invention; Figure 22 is a schematic diagram of the connection between the elastic part and the oil seal in the fourth embodiment of the present invention.

[0105] 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.

[0106] For other contents of this embodiment, refer to Example 1, Example 2 or Example 3. Example

[0107] Please refer to Figure 23, which is a structural diagram of the elastic part in Example 5 of the present invention.

[0108] 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.

[0109] For other contents of this embodiment, refer to Example 1, Example 2, Example 3 or Example 4.

[0110] 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.

[0111] Although this article uses the figure marks in the figures more frequently: first prestressed steel rod 1, small sleeve 2, inserted rod 3, middle sleeve 4, elastic part 5, elastic abutment 6, limiting sleeve 7, large sleeve 8, second prestressed steel rod 9, first internal thread 10, first connecting chamber 21, second connecting chamber 22, first partition 23, external thread connecting end 31, plug-in end 32, chamfer 32-1, 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 pad 60, elastic ring 61, annular groove 62, internal thread 80, third connecting chamber 81, second partition 82, seamless connector 100 and other terms, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitation construed in them would be contrary to the spirit of the present invention.

Claims

1. A seamless connector, characterized in that: include: A small sleeve (2) having a first internal thread (10) 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); An insert rod (3) having an external threaded connection end (31) threadedly connected to the first internal thread (10) of the small sleeve (2) at one axial end, and an inserting end (32) that can be inserted into the inserting cavity at the other end; 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 small sleeve (2); 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. A seamless connector 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. A seamless connector 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. A seamless connector 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. A seamless connector 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. A seamless connector according to claim 5, 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. A seamless connector 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. A seamless connector 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. A seamless connector according to claim 1, characterized in that: An end of the elastic portion (5) relatively close to the small sleeve (2) smoothly transitions to the inner wall of the middle sleeve (4).

10. A seamless connector 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. A seamless connector 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. A seamless connector, characterized in that: include: Small sleeve (2); A first internal thread (10) 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); An insert rod (3) having an external threaded connection end (31) threadedly connected to the first internal thread (10) of the small sleeve (2) at one axial end, and an inserting end (32) that can be inserted into the inserting cavity at the other end; 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 small sleeve (2); 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).

13. A seamless connector according to claim 1 or 12, 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).

14. A seamless connector according to claim 13, 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).

15. A seamless connector according to claim 13, 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.

16. A seamless connector according to claim 13, 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).

17. A seamless connector according to claim 16, characterized in that: The oil seal (56) is made of nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane or polytetrafluoroethylene.

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