Self-locking connection and connection pile

Abstract

The utility model relates to a self -locking connecting piece and connecting pile, including small sleeve, its inside forms first internal thread, big sleeve, its inside forms and forms second internal thread in the plug -in cavity of small sleeve one end's plug -in cavity, plug -in rod, its axial one end has with first external thread connecting end of first internal thread of small sleeve screw joint, the other end forms the plug -in end that can extend into the plug -in cavity, locking portion, built -in in the plug -in cavity of big sleeve, be used for locking the plug -in end, the utility model design is ingenious, and the self -locking connecting piece provided can connect fast upper connecting pile and lower connecting pile, has saved construction time, and the upper connecting pile and lower connecting pile after connecting firmness is high, especially good tensile property.

Description

Technical Field

[0001] This utility model relates to the field of building technology, and in particular to self-locking connectors and connecting piles. Background Technology

[0002] During use, pipe piles require different lengths depending on the specific application needs. This necessitates connecting the pipe piles to form longer pile bodies. Currently, existing pipe piles have steel plates at both ends, and the piles are connected by welding. However, after the connected piles are driven into the ground, the presence of salts, especially chlorides, in the soil corrodes the exposed steel plates, causing the connection between the pipe piles to break. Furthermore, the welding method for connecting the steel plates is relatively complex and inconvenient.

[0003] To address the aforementioned technical problems, people have conducted long-term research and proposed various solutions. For example, Chinese Patent Publication No. CN204174613U discloses a quick-connecting pile, which includes a strip-shaped pile body with concave and convex cross-sectional areas. At least one connector is provided at both ends of the pile body to allow two pile bodies to connect to each other. The connector includes a plug assembly protruding from one end of the pile body and a slot assembly recessed into one end of the pile body. The plug assembly and the slot assembly are located at the two ends of the pile body, respectively. When the plug assembly of one pile body is inserted into the slot assembly of another pile body, the plug assembly and the slot assembly are sealed together.

[0004] The above-mentioned solution improves the existing technology to some extent. However, when connecting the pipe piles, the solution leaves a gap between the two pipe piles, which causes them to shake during use. This affects the connection strength between the two pipe piles and results in the product being unqualified.

[0005] Therefore, it is necessary to improve upon the above-mentioned issues. Utility Model Content

[0006] The present invention aims to overcome the defects in the prior art and provide a self-locking connector and connecting pile that has a simple structure, stable connection, saves construction time, and has good tensile strength.

[0007] To solve the above problems, this utility model adopts the following technical solution: a self-locking connector, including a small sleeve with a first internal thread; a large sleeve with a insertion cavity, and a second internal thread in the insertion cavity near the small sleeve; an insertion rod with a first external thread connecting end screwed into the first internal thread of the small sleeve at one axial end, and an insertion end that can extend into the insertion cavity at the other end; a locking part, built into the insertion cavity of the large sleeve, for locking the insertion end; the outer side of the locking part has a second external thread connecting end screwed into the second internal thread of the large sleeve; the locking part is hollow inside and includes two or more self-locking pieces arranged in a ring array, with an axially extending gap between two adjacent self-locking pieces, and the locking part can expand or contract radially through the gap; the locking part can elastically expand to facilitate the insertion and passage of the insertion rod, and can contract to make the insertion end abut against the self-locking piece.

[0008] As a preferred embodiment of the present invention, the insertion rod includes a first fixing part, an insertion end, and an extension part located between the first fixing part and the insertion part; the insertion end protrudes from the extension part and a stepped surface is formed between the insertion end and the extension part.

[0009] As a preferred embodiment of the present invention, the insertion rod further includes an abutment portion located between the insertion end and the extension portion, and the self-locking piece can surround and abut against the abutment portion.

[0010] In a preferred embodiment of this utility model, the Rockwell hardness of the abutting portion is greater than or equal to the Rockwell hardness of the extension portion.

[0011] As a preferred embodiment of the present invention, the first external threaded connection end is located on the first fixed part, and an upper limit baffle is provided between the first fixed part and the extension part.

[0012] As a preferred embodiment of this utility model, the outer diameter of the extension decreases sequentially along the insertion direction of the plug-in portion.

[0013] As a preferred embodiment of this utility model, the insertion end of the plug rod is provided with a chamfer, and the locking part further includes a guide slope. The guide slope is located at the end of the locking part that is relatively close to the small sleeve. The chamfer is used to guide the guide slope and facilitate the insertion of the plug rod into the locking part.

[0014] As a preferred embodiment of this utility model, the outer edge of the small sleeve near the upper limit stop plate has a first flange; when the first fixing part of the insertion rod is assembled in the small sleeve, the upper limit stop plate abuts against the first flange.

[0015] As a preferred embodiment of this utility model, a first arc-shaped structure is formed at the connection between the outer side of the first flange and the small sleeve.

[0016] As a preferred embodiment of the present invention, the locking part includes a second fixing part and a plurality of self-locking pieces connected to the second fixing part; a gap with an opening along the insertion direction is formed between the plurality of self-locking pieces; a locking surface is formed at the bottom of the self-locking piece; the locking surface of the self-locking piece is disposed opposite to the stepped surface of the insertion rod.

[0017] As a preferred embodiment of this utility model, the second external threaded connection end is located on the second fixing part, and a lower limit baffle is provided on the top of the second fixing part.

[0018] As a preferred embodiment of this utility model, the lower limit stop plate has symmetrically arranged lower limit protrusions; the upper limit stop plate has an upper limit protrusion corresponding to the lower limit protrusions; the insert rod is inserted into the locking part, and the lower limit protrusions and the upper limit protrusions are on the same vertical plane.

[0019] As a preferred embodiment of the present invention, the second external threaded connection end on the outer peripheral wall of the second fixing part extends to the outer peripheral wall of the self-locking piece, so that the outer peripheral wall of the self-locking piece has a threaded connection end, so that the self-locking piece part is threadedly connected to the large sleeve.

[0020] As a preferred embodiment of this utility model, the outer edge of the large sleeve near the lower limit stop plate has a second flange; when the locking part is installed inside the large sleeve, the lower limit stop plate abuts against the second flange.

[0021] As a preferred embodiment of this utility model, a second arc-shaped structure is formed at the connection between the second flange and the bottom of the large sleeve.

[0022] As a preferred embodiment of this utility model, multiple self-locking plates are evenly arranged in a circumferential direction with the axis of the locking part as the center.

[0023] As a preferred embodiment of this utility model, the outer diameter of the plurality of self-locking pieces decreases sequentially along the insertion direction of the plug-in portion.

[0024] In a preferred embodiment of this utility model, both the insertion rod and the locking part are made of ferrous metal.

[0025] In a preferred embodiment of this utility model, the insertion rod and locking part are made of carbon steel or alloy steel.

[0026] As a preferred embodiment of this utility model, the insertion rod and locking part are made of carbon steel, chromium steel, chromium vanadium steel, chromium nickel steel, chromium molybdenum steel, chromium nickel molybdenum steel, chromium manganese silicon steel, ultra-high strength steel or stainless steel.

[0027] The connecting pile includes an upper connecting pile, a lower connecting pile, and a self-locking connector for connecting the upper connecting pile and the lower connecting pile. The small sleeve is built into the upper connecting pile, and the large sleeve is built into the lower connecting pile. The insert rod in the small sleeve is inserted into and passes through the locking part of the large sleeve to lock the upper connecting pile and the lower connecting pile.

[0028] In a preferred embodiment of this utility model, the connection gap between the upper connecting pile and the lower connecting pile is filled with epoxy resin.

[0029] As a preferred embodiment of this utility model, a sleeve is fitted on the outer side of the connection between the upper connecting pile and the lower connecting pile.

[0030] The beneficial effects of this utility model are: 1. This utility model has a simple structure and the self-locking connector is easy to install. After the insertion end of the plug rod is inserted into the locking part, the self-locking plate will elastically contract and surround the extension of the insertion end. The end of the self-locking plate abuts against the stepped surface of the plug rod, and the abutting surface between the end of the self-locking plate and the stepped surface of the plug rod is approximately annular with a large abutting area, which can ensure the joint strength between the small sleeve and the large sleeve, especially greatly improving the tensile performance. The self-locking plate can not only surround the extension of the plug rod, but also limit the extension and prevent the extension from shaking in the radial direction.

[0031] 2. This utility model has an ingenious design. The self-locking connector provided can quickly connect the upper and lower connecting piles, saving construction time. Moreover, the connected upper and lower connecting piles have high firmness, especially good tensile strength.

[0032] 3. The present invention has a simple processing technology, low cost, and wide applicability; the provided connecting pile is simple to process, easy to assemble, has reliable connection strength, can effectively reduce construction costs and project time, and has good economic benefits. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of the self-locking connector according to an embodiment of the present invention; Figure 2 This is an exploded view of the self-locking connector according to an embodiment of this utility model; Figure 3 This is a front view of the locking part according to an embodiment of the present utility model; Figure 4 This is a top view of the locking part according to an embodiment of the present utility model; Figure 5 This is a front view of the insertion rod according to an embodiment of the present utility model; Figure 6 This is a cross-sectional view of the large sleeve in an embodiment of this utility model; Figure 7This is a cross-sectional view of the small sleeve in an embodiment of this utility model; Figure 8 This is a schematic diagram of the assembly of the connecting pile according to an embodiment of this utility model; Figure 9 This is an embodiment of the present utility model. Figure 8 A magnified view of a portion of the image; Figure 10 This is an embodiment of the present utility model. Figure 9 Exploded view of the connecting pile assembly; Explanation of reference numerals in the attached drawings: Small sleeve 1, Large sleeve 2, Insert rod 3, Locking part 4, Prestressed steel bar 5, First flange 6, First arc-shaped structure 7, Second flange 8, Second arc-shaped structure 9, First internal thread 10, Second internal thread 20, First external thread connection end 30, Insertion end 31, Chamfer 31-1, First fixing part 32, Extension part 33, Step surface 34, Abutting part 35, Upper limit stop plate 36, Upper limit protrusion 37, Second external thread connection end 40, Self-locking piece 41, Gap 42, Guide slope 43, Second fixing part 44, Locking surface 45, Lower limit protrusion 46, Lower limit stop plate 47, Upper connecting post 100, Lower connecting post 200, Self-locking connector 300, Epoxy resin 400, Hoop 500. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] Example: See Figures 1-7As shown, the self-locking connector includes a small sleeve 1 with a first internal thread 10 formed inside; a large sleeve 2 with a insertion cavity inside, and a second internal thread 20 formed in the insertion cavity near one end of the small sleeve 1; an insertion rod 3 with a first external thread connection end 30 at one axial end that is screwed to the first internal thread 10 of the small sleeve 1, and an insertion end 31 at the other end that can extend into the insertion cavity; and a locking part 4, which is built into the insertion cavity of the large sleeve 2 to lock the insertion end 31. The outer side of the locking part 4 has a second external thread connection end 40 that is screwed into the second internal thread 20 of the large sleeve 2; the locking part 4 is hollow inside and includes two or more self-locking pieces 41 arranged in a ring array, and a gap 42 extending axially is formed between two adjacent self-locking pieces 41. The locking part 4 can expand or contract radially through the gap 42; the locking part 4 can expand elastically to facilitate the insertion and passage of the insertion rod 3, and can contract to make the insertion end 31 abut against the self-locking piece 41.

[0037] This utility model has a simple structure and the self-locking connector is easy to install. After the insertion end 31 of the plug rod 3 is inserted into the locking part 4, the end of the self-locking piece 41 abuts against the stepped surface 34 of the plug rod 3. The abutting surface between the end of the self-locking piece 41 and the stepped surface 34 of the plug rod 3 is approximately annular, with a large abutting area, which can ensure the joint strength between the small sleeve 1 and the large sleeve 2, especially greatly improving the tensile performance. The self-locking piece 41 can not only surround the extension 33 of the plug rod 3, but also limit the extension 33 to prevent the extension 33 from shaking in the radial direction.

[0038] See Figure 1 , Figure 2 and Figure 5 As shown, the insertion rod 3 is a cylindrical part. The first fixing part 32 is used to fix it to an external part, and the insertion end 31 is used to insert into the locking part 4. For ease of insertion, the insertion rod 3 is preferably cylindrical; in other embodiments, the insertion rod 3 can also be a square column, a conical column, or other shapes. To increase the load-bearing capacity of the quick-locking connector, the insertion rod 3 is made of solid material. It is understood that in other embodiments, depending on different load-bearing requirements, the insertion rod 3 can also be made of hollow material.

[0039] Specifically, the insertion rod 3 includes a first fixing part 32, an insertion end 31, and an extension part 33 located between the first fixing part 32 and the insertion part 31; the insertion end 31 protrudes from the extension part 33 and a stepped surface 34 is formed between the insertion end 31 and the extension part 33.

[0040] The insertion end 31 can pass through and abut against the locking surface 45 of the locking part 4. When the insertion end 31 passes through the locking part 4, it can cause the self-locking piece 41 of the locking part 4 to expand elastically. After the insertion end 31 passes through the self-locking piece 41, the self-locking piece 41 elastically contracts and surrounds the extension part 33, which can restrict the radial movement of the insertion rod 3.

[0041] The insertion rod 3 also includes an abutment portion 35, which is located between the insertion end 31 and the extension portion 33. The self-locking piece 41 can surround and abut against the abutment portion 35. The Rockwell hardness of the abutment portion 35 is greater than or equal to the Rockwell hardness of the extension portion 33.

[0042] The first external threaded connection end 30 is located on the first fixing part 32, and an upper limit stop plate 36 is provided between the first fixing part 32 and the extension part 33.

[0043] The upper limit stop 36 can be a limiting partition, a limiting block, or other components. During use, the upper limit stop 36 is located between the first fixing part 32 and the extension part 33. The upper limit stop 36 is used to limit the movement of the first fixing part 32 within the small sleeve 1, thereby ensuring that the insertion rod 3 can be smoothly inserted into the locking part 4 and ensuring the safety of the insertion rod 3.

[0044] The outer diameter of the extension 33 decreases sequentially along the insertion direction of the insertion part 31. This arrangement allows for a smoother connection between the insertion rod 3 and the locking part 4, reduces the force concentration on the locking part 4 at the connection point with the insertion rod 3, and facilitates safer and more stable elastic contraction or expansion of the locking part 4.

[0045] The insertion end 31 of the insertion rod 4 is provided with a chamfer 31-1. The locking part 4 also includes a guide slope 43. The guide slope 43 is located at the end of the locking part 4 that is relatively close to the small sleeve 1. The chamfer 31-1 is used to guide the guide slope 43 and facilitate the insertion of the insertion rod 3 into the locking part 4. By setting the chamfer 31-1 and the guide slope 43 to cooperate with each other, the contact area between the two is increased during the insertion of the insertion rod 4 into the locking part 4, so that the insertion rod 4 can enter the locking part 4 more smoothly.

[0046] See Figure 3 and Figure 4 As shown, the locking part 4 includes a second fixing part 44 and a plurality of self-locking pieces 41 connected to the second fixing part 44; a gap 42 with an opening along the insertion direction is formed between the plurality of self-locking pieces 41; a locking surface 45 is formed at the bottom of the self-locking piece 41; the locking surface 45 of the self-locking piece 41 is disposed opposite to the stepped surface 34 of the insertion rod 3.

[0047] The locking part 4 cooperates with the insertion rod 3; it is understood that in other embodiments, the locking part 4 may also be matched with the insertion rod 3 in other shapes such as square tube or conical tube.

[0048] The second external threaded connection end 40 is located on the second fixing part 44, and a lower limit baffle 47 is provided on the top of the second fixing part 44.

[0049] The lower limit baffle 47 can be a limiting partition, a limiting block, or other components. During use, the lower limit baffle 47 is located at the top of the second fixing part 44. The lower limit baffle 47 is used to limit the movement of the locking part 4 within the large sleeve 2, thereby ensuring that the insertion rod 3 can be smoothly inserted into the locking part 4 and ensuring the safety of the insertion rod 3.

[0050] Specifically, the lower limit stop plate 47 has symmetrically arranged lower limit protrusions 46; the upper limit stop plate 36 has an upper limit protrusion 37 corresponding to the lower limit protrusions 46; the insertion rod 3 is inserted into the locking part 4, and the lower limit protrusions 46 and the upper limit protrusions 37 are on the same vertical plane; the lower limit protrusions 46 and the upper limit protrusions 37 cooperate with each other, so that the self-locking connector is accurately positioned during the insertion process, effectively improving the reliability of the connecting piles and ensuring the connection strength between the connecting piles.

[0051] In one embodiment, the second external threaded connection end 40 on the outer peripheral wall of the second fixing part 44 extends to the outer peripheral wall of the self-locking piece 41, so that the outer peripheral wall of the self-locking piece 41 has a threaded connection end, and the self-locking piece 41 is partially threadedly connected to the large sleeve 2. With this configuration, the self-locking piece 41 itself is also connected to the second external threaded connection end 40, which makes it more stable when the self-locking piece 41 elastically contracts or expands, and the self-locking piece 41 is less prone to shaking.

[0052] Multiple self-locking plates 41 are arranged together to form a hollow column shape. There is a certain gap 42 between each pair of adjacent self-locking plates 41 to allow the self-locking plates 41 to elastically expand and contract. The self-locking plates 41 can be elastically expanded to allow the insertion end 31 to pass through. After the insertion end 31 passes through the self-locking plate 41, the self-locking plate 41 elastically contracts and surrounds the extension 33 of the insertion rod 3. Preferably, in order to balance the force on the multiple self-locking plates 41, the multiple self-locking plates 41 are evenly arranged in a circumferential direction with the axis of the locking part 4 as the center.

[0053] The outer diameters of the multiple self-locking pieces 41 decrease sequentially along the insertion direction of the insertion portion 31. This arrangement, compared to a self-locking piece 41 that is straight after axial sectioning, has the following advantages when it is arc-shaped after axial sectioning: When the insertion rod passes through the opening formed by the self-locking pieces 41, the self-locking pieces 41 can provide greater springback stress and quickly retract to close the extension portion 33, thus ensuring that the shape of the opening formed by the self-locking pieces 41 remains consistent before and after the insertion rod 3 passes through. This avoids changes in the shape or size of the opening formed by the self-locking pieces 41 after the insertion rod 3 passes through. Changes in the opening formed by the self-locking pieces 41 will cause changes in the contact area and contact reliability between the end face of the self-locking pieces 41 and the stepped surface 34 of the insertion rod 3. Therefore, the arrangement of the outer diameters of the multiple self-locking pieces 41 decreasing sequentially along the insertion direction of the insertion portion 31 can ensure that the end face of the self-locking pieces 41 reliably and stably abuts against the stepped surface 34 of the insertion rod 3.

[0054] In this embodiment, both the insertion rod 3 and the locking part 4 are made of ferrous metal. Preferably, the insertion rod 3 and the locking part 4 are made of carbon steel or alloy steel. Specifically, the insertion rod 3 and the locking part 4 are made of carbon steel, chromium steel, chromium-vanadium steel, chromium-nickel steel, chromium-molybdenum steel, chromium-nickel-molybdenum steel, chromium-manganese-silicon steel, ultra-high strength steel, or stainless steel. It is understood that in other embodiments, they may also be made of other materials.

[0055] See Figure 6 , Figure 6 This is a cross-sectional view of the large sleeve in an embodiment of the present invention; a second flange 8 is formed on the outer edge of the large sleeve 2 near the lower limit baffle 47; when the locking part 4 is installed inside the large sleeve 2, the lower limit baffle 47 abuts against the second flange 8; the lower limit baffle 47 and the second flange 8 abut against each other, which improves the connection stability and safety between the two, thereby ensuring safe use.

[0056] Meanwhile, a second arc-shaped structure 9 is formed at the connection between the second flange 8 and the bottom of the large sleeve 2, making the structure of the entire large sleeve 2 more robust. Moreover, the use of the second arc-shaped structure 9 can reduce the height of the second flange 8, which is more conducive to controlling the deformation of the second flange 8 and reducing the risk of edge tearing of the second flange 8.

[0057] See Figure 7 , Figure 7 This is a cross-sectional view of the small sleeve in an embodiment of the present invention; a first flange 6 is formed on the outer edge of the small sleeve 1 near the upper limit stop plate 36; when the first fixing part 32 of the insertion rod 4 is assembled inside the small sleeve 1, the upper limit stop plate 36 abuts against the first flange 6, and the upper limit stop plate 36 and the first flange 6 abut against each other, which improves the connection stability and safety between the two, thereby ensuring safe use.

[0058] Meanwhile, a first arc-shaped structure 7 is formed at the connection between the outer side of the first flange 6 and the small sleeve 1, making the structure of the entire small sleeve 1 more robust. Moreover, the use of the first arc-shaped structure 7 can reduce the height of the first flange 6, which is also more conducive to controlling the deformation of the first flange 6 and reducing the risk of edge tearing of the first flange 6.

[0059] Based on this, see Figures 8-10 , Figure 8 This is a schematic diagram of the assembly of the connecting pile according to an embodiment of this utility model; Figure 9 This is an embodiment of the present utility model. Figure 8 A magnified view of a portion of the image; Figure 10 This is an embodiment of the present utility model. Figure 9 Exploded view of the connecting pile assembly.

[0060] The connecting pile includes an upper connecting pile 100, a lower connecting pile 200, and a self-locking connector 300 for connecting the upper connecting pile 100 and the lower connecting pile 200. A small sleeve 1 is built into the upper connecting pile 100, and a large sleeve 2 is built into the lower connecting pile 200. The insert rod 3 in the small sleeve 1 is inserted into and passes through the locking part 4 of the large sleeve 2 to lock the upper connecting pile 100 and the lower connecting pile 200.

[0061] This utility model provides a self-locking connector 300 for connecting two engineering components. In this embodiment, the self-locking connector 300 is used to connect prestressed steel bars 5 in a pile. It is understood that in other embodiments, the self-locking connector 300 can also be applied in other engineering fields, such as prefabricated buildings, and can also be used to connect reinforcing bars in other applications, such as concrete pouring.

[0062] It is understood that the upper connecting pile 100 and the lower connecting pile 200 in this embodiment are specifically made of concrete, and their external shape can be configured as polygonal or circular, solid or hollow structures according to the requirements of use. In order to improve the connection strength between the upper connecting pile 100 and the lower connecting pile 200, this embodiment uniformly provides a plurality of self-locking connectors 300 between the upper connecting pile 100 and the lower connecting pile 200, and the upper connecting pile 100 and the lower connecting pile 200 are respectively provided with grooves on their opposite surfaces to accommodate the self-locking connectors 300 used to connect and fix the upper connecting pile 100 and the lower connecting pile 200, that is, the upper connecting pile 100 and the lower connecting pile 200 of the assembled connecting pile are fitted together.

[0063] Please refer to the following: Figure 8 , Figure 8This is a schematic diagram of the assembly of the connecting pile according to an embodiment of this utility model. The manufacturing process of the connecting pile is as follows: prestressed steel bars 5 are arranged according to the stress requirements after molding to form a reinforcing cage. The reinforcing cage is pre-stretched to generate prestress, so as to offset or reduce the tensile stress generated by external loads, so that the prestressed steel bars 5 do not crack under normal use or delay the time for cracks to form. After the reinforcing cage is formed, it is placed in a mold, and then concrete is poured into the mold. If a hollow connecting pile is required, the centrifugal or core-pulling mode is activated. If a solid pile is required, it is placed in the mold. After molding, it is dried and demolded to form a connecting pile. This pile manufacturing method is simple, the connected piles produced have high strength, and the construction site is flexible and the cost is low.

[0064] The connection method between the connecting piles is as follows: when connecting two upper connecting piles 100 and lower connecting piles 200, the prestressed steel bar 5 connected to the upper connecting pile 100 is aligned with the prestressed steel bar 5 connected to the lower connecting pile 200, and a self-locking connector 300 is used for connection.

[0065] Prestressed steel bar 5 is a steel bar used in prestressed concrete. Prestressed steel bar 5 has advantages such as high strength and toughness, low relaxation, strong bond with concrete, good weldability, forgeability, and material saving.

[0066] In one embodiment of this utility model, the prestressed steel bar 5, the small sleeve 1, the large sleeve 2, the upper connecting pile 100 and the lower connecting pile 200 are all pre-embedded in the concrete to become pre-embedded elements.

[0067] The gap between the upper connecting pile 100 and the lower connecting pile 200 is filled with epoxy resin 400. More specifically, epoxy resin or sealing oil or other sealing materials can be pre-filled into the gap to facilitate subsequent assembly.

[0068] Specifically, a sleeve 500 is fitted on the outer side of the connection between the upper connecting pile 100 and the lower connecting pile 200; after the upper connecting pile 100 and the lower connecting pile 200 are connected, a sleeve 500 is installed on the periphery of the connected pile after connection. The sleeve 500 is used to fasten the connection between the upper connecting pile 100 and the lower connecting pile 200 to prevent the upper connecting pile 100 and the lower connecting pile 200 from being misaligned during service.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those 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 to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0070] Although this article uses many reference numerals from the figures, such as small sleeve 1, large sleeve 2, insert rod 3, locking part 4, prestressed steel bar 5, first flange 6, first arc structure 7, second flange 8, second arc structure 9, first internal thread 10, second internal thread 20, first external thread connection end 30, insertion end 31, chamfer 31-1, first fixing part 32, extension part 33, stepped surface 34, abutting part 35, upper limit stop plate 36, upper limit protrusion 37, second external thread connection end 40, self-locking plate 41, gap 42, guide slope 43, second fixing part 44, locking surface 45, lower limit protrusion 46, lower limit stop plate 47, upper connecting post 100, lower connecting post 200, self-locking connector 300, epoxy resin 400, and sleeve 500, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A self-locking connector, characterized in that: include Small sleeve (1); its interior has a first internal thread (10); The large sleeve (2) has an insertion cavity inside, and a second internal thread (20) is formed in the insertion cavity near the end of the small sleeve (1). The insert rod (3) has a first external thread connection end (30) at one axial end that is screwed into the first internal thread (10) of the small sleeve (1), and the other end forms an insertion end (31) that can be inserted into the insertion cavity. The locking part (4) is built into the insertion cavity of the large sleeve (2) to lock the insertion end (31); the outer side of the locking part (4) has a second external thread connection end (40) that is screwed into the second internal thread (20) of the large sleeve (2). The locking part (4) is hollow inside and includes two or more self-locking pieces (41) arranged in a ring array. A gap (42) extending axially is formed between two adjacent self-locking pieces (41). The locking part (4) can expand or contract radially through the gap (42). The locking part (4) can expand elastically to facilitate the insertion and passage of the insertion rod (3), and can contract to make the insertion end (31) abut against the self-locking piece (41).

2. The self-locking connector according to claim 1, characterized in that: The insertion rod (3) includes a first fixing part (32), a insertion end (31), and an extension part (33) located between the first fixing part (32) and the insertion end (31); the insertion end (31) protrudes from the extension part (33) and a stepped surface (34) is formed between the insertion end (31) and the extension part (33).

3. The self-locking connector according to claim 1, characterized in that: The insertion rod (3) also includes an abutment portion (35), which is located between the insertion end (31) and the extension portion (33), and the self-locking piece (41) can surround and abut against the abutment portion (35).

4. The self-locking connector according to claim 3, characterized in that: The Rockwell hardness of the contact portion (35) is greater than or equal to the Rockwell hardness of the extension portion (33).

5. The self-locking connector according to claim 1, characterized in that: The first external threaded connection end (30) is located on the first fixing part (32), and an upper limit stop plate (36) is provided between the first fixing part (32) and the extension part (33).

6. The self-locking connector according to claim 2, characterized in that: The outer diameter of the extension (33) decreases sequentially along the insertion direction of the plug end (31).

7. The self-locking connector according to claim 2, characterized in that: The insertion end (31) of the insertion rod (3) is provided with a chamfer (31-1). The locking part (4) also includes a guide slope (43). The guide slope (43) is located at one end of the locking part (4) that is relatively close to the small sleeve (1). The chamfer (31-1) is used to guide the guide slope (43) and facilitate the insertion of the insertion rod (3) into the locking part (4).

8. The self-locking connector according to claim 7, characterized in that: The small sleeve (1) has a first flange (6) formed on the outer edge of the side near the upper limit stop plate (36); when the first fixing part (32) of the insert rod (3) is installed in the small sleeve (1), the upper limit stop plate (36) abuts against the first flange (6).

9. The self-locking connector according to claim 8, characterized in that: A first arc-shaped structure (7) is formed at the connection between the outer side of the first flange (6) and the small sleeve (1).

10. The self-locking connector according to claim 1, characterized in that: The locking part (4) includes a second fixing part (44) and a plurality of self-locking pieces (41) connected to the second fixing part (44); a gap (42) with an opening along the insertion direction is formed between the plurality of self-locking pieces (41); a locking surface (45) is formed at the bottom of the self-locking piece (41); the locking surface (45) of the self-locking piece (41) is disposed opposite to the stepped surface (34) of the insertion rod (3).

11. The self-locking connector according to claim 1, characterized in that: The second external threaded connection end (40) is located on the second fixing part (44), and a lower limit baffle (47) is provided on the top of the second fixing part (44).

12. The self-locking connector according to claim 11, characterized in that: The lower limit stop (47) has symmetrically arranged lower limit protrusions (46); the upper limit stop (36) has an upper limit protrusion (37) corresponding to the lower limit protrusion (46); the insert rod (3) is inserted into the locking part (4), and the lower limit protrusion (46) and the upper limit protrusion (37) are on the same vertical plane.

13. The self-locking connector according to claim 10, characterized in that: The second external threaded connection end (40) on the outer peripheral wall of the second fixing part (44) extends to the outer peripheral wall of the self-locking piece (41), so that the outer peripheral wall of the self-locking piece (41) has a threaded connection end, so that the self-locking piece (41) is threadedly connected to the large sleeve (2).

14. The self-locking connector according to claim 13, characterized in that: The outer edge of the large sleeve (2) near the lower limit stop (47) has a second flange (8); when the locking part (4) is installed inside the large sleeve (2), the lower limit stop (47) abuts against the second flange (8).

15. The self-locking connector according to claim 14, characterized in that: The second flange (8) and the bottom of the large sleeve (2) form a second arc-shaped structure (9).

16. The self-locking connector according to claim 10, characterized in that: Multiple self-locking plates (41) are evenly arranged in a circumferential direction around the axis of the locking part (4).

17. The self-locking connector according to claim 10, characterized in that: The outer diameter of the multiple self-locking pieces (41) decreases sequentially along the insertion direction of the plug end (31).

18. The self-locking connector according to claim 1, characterized in that: Both the insertion rod (3) and the locking part (4) are made of black metal.

19. The self-locking connector according to claim 18, characterized in that: The insertion rod (3) and locking part (4) are made of carbon steel or alloy steel.

20. The self-locking connector according to claim 19, characterized in that: The insert (3) and locking part (4) are made of carbon steel, chromium steel, chromium vanadium steel, chromium nickel steel, chromium molybdenum steel, chromium nickel molybdenum steel, chromium manganese silicon steel, ultra-high strength steel or stainless steel.

21. A connecting pile, characterized in that: It includes an upper connecting post (100), a lower connecting post (200), and a self-locking connector (300) for connecting the upper connecting post (100) and the lower connecting post (200), wherein the self-locking connector (300) is the self-locking connector according to any one of claims 1-20; the small sleeve (1) is built into the upper connecting post (100), and the large sleeve (2) is built into the lower connecting post (200); the insert rod (3) in the small sleeve (1) is inserted into and passes through the locking part (4) of the large sleeve (2) for locking the upper connecting post (100) and the lower connecting post (200).

22. The connecting pile according to claim 21, characterized in that: The connection gap between the upper connecting pile (100) and the lower connecting pile (200) is filled with epoxy resin (400).

23. The connecting pile according to claim 21, characterized in that: A sleeve (500) is fitted on the outside of the connection between the upper connecting pile (100) and the lower connecting pile (200).

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