Pre-pressing type mechanical connector and precast pile connecting structure

Abstract

The utility model discloses a pre-pressing type mechanical connector and a precast pile connecting structure. The mechanical connector comprises a positioning inserting rod, a pre-pressing elastic sleeve, a nesting sleeve, a stop sleeve and a spring. A clamping edge is arranged on a plug of the positioning insertion rod; a conical clamping surface is arranged on an elastic sheet of the pre-pressing elastic sleeve; the plug can be inserted into the pre-pressing elastic sleeve, and the clamping edge is in contact with and clamped with the clamping surface; and after the plug is clamped with the elastic sheet, the nesting sleeve can be hooped on the outer side of the elastic sheet under the rebound push of the spring. The utility model discloses a pre-pressing type mechanical joint which has the advantages that a three-cone integrated structure is realized, the connection performance of the mechanical joint is effectively improved, gaps among thread teeth are eliminated, and a larger free gap is formed in the plugging process of a plug and an elastic sheet; the clamping edge of the plug and the clamping face of the elastic piece can be effectively clamped when the end face of the precast pile is inclined or the positioning insertion rod is deviated or inclined due to the perpendicularity problem of the precast pile in the piling process.

Description

Technical Field

[0001] This utility model relates to the field of precast pile connection technology, specifically to a pre-stressed mechanical joint and a precast pile connection structure. Background Technology

[0002] In recent years, precast concrete components have been widely used in the construction industry. When using precast concrete components, it is often necessary to connect multiple components, which has led to the development of connection structures such as mechanical plug joints. Mechanical joints are increasingly favored by producers and users in the industry due to their ease of insertion and excellent pull-out resistance and corrosion resistance. However, existing joints have the following problems: the existing spring-loaded mechanical connection joints generally use the end face of the spring plate to lock the connection with the snap-fit ​​surface of the plug of the positioning rod. This can lead to problems such as over-insertion or under-insertion of the plug, resulting in connection gaps or connection failure. At the same time, existing spring-loaded mechanical joints are prone to slippage between the plug and the spring plate, resulting in an unstable snap-fit. Utility Model Content

[0003] This utility model addresses the above-mentioned problems by proposing a pre-compression mechanical joint.

[0004] The technical means adopted in this utility model are as follows:

[0005] A pre-compression mechanical joint includes a positioning rod, a pre-compression sleeve, a nest, a stop sleeve, and a spring;

[0006] One end of the positioning rod is provided with a plug, and the plug is provided with a snap-fit ​​edge;

[0007] The pre-compression sleeve is disposed in the receiving space. The end of the pre-compression sleeve facing the inside of the receiving space has a plurality of circumferentially distributed spring pieces. The inner sidewall of the spring pieces is provided with a conical snap-fit ​​surface. The plug can be inserted into the pre-compression sleeve and the snap-fit ​​edge contacts and snaps into place with the snap-fit ​​surface.

[0008] The accommodating space is also provided with the nest, the stop sleeve, and the spring;

[0009] Before the plug is inserted into the pre-compressed sleeve, the stop sleeve can compress the spring within the receiving space, so that the nest can be located in the space between the end of the spring piece and the spring;

[0010] During the insertion of the plug into the pre-compressed sleeve, the plug can apply a thrust to the stop sleeve to release the compression of the spring. The spring's rebound pushes the nest towards the side of the spring piece, so that the nest is clamped on the outside of the spring piece.

[0011] Furthermore, the outer diameter of the plug is larger than the outer diameter of the portion of the positioning rod that connects to the plug, such that the edge of the plug facing the positioning rod forms the snap-fit ​​edge.

[0012] Furthermore, the radial dimension of the transition surface at the end where the plug connects to the positioning rod gradually increases along the insertion direction of the plug.

[0013] Furthermore, the plug is also provided with a guide surface.

[0014] Furthermore, the nest is provided with an inner hole that can be fitted around the outside of the spring piece, and the end of the inner hole away from the spring piece is provided with an inwardly protruding first retaining edge;

[0015] The outer side wall of the stop sleeve is provided with an outwardly protruding second stop at the end away from the spring piece;

[0016] Before the plug is inserted into the pre-compressed sleeve, the stop sleeve is placed in the nested inner hole and the end of the spring abuts against the end of the stop sleeve. The nesting compresses the spring within the receiving space through the mutual abutment of the first and second stops.

[0017] During the insertion of the plug into the pre-compressed sleeve, the plug can apply a pushing force to the stop sleeve, causing the first and / or second stop edges to break to release the stop sleeve from the nest, and then the spring's rebound pushes the nest towards the side of the spring piece, so that the nest is clamped on the outside of the spring piece.

[0018] Furthermore, the outer diameter of the nest is less than or equal to the inner diameter of the accommodating space; the inner hole of the nest is a tapered hole.

[0019] Furthermore, an annular groove is machined on the outer wall of the end of the nest facing the spring, and a spring locking part is formed at the end of the nest facing the spring, and one end of the spring can be fitted onto the spring locking part.

[0020] Furthermore, the stop sleeve is provided with an injection hole.

[0021] Furthermore, the accommodating space is also filled with epoxy resin adhesive.

[0022] Furthermore, it also includes a first nut sleeve and / or a second nut sleeve;

[0023] One end of the first nut sleeve is used to connect with the main reinforcing bar, and the other end is used to connect with the positioning rod;

[0024] One end of the second nut sleeve is used to connect with the main rib, and the cavity of the second nut sleeve is the receiving space. The preloaded spring sleeve, the nest, the stop sleeve, and the spring are arranged in the second nut sleeve.

[0025] Furthermore, the first nut sleeve and the second nut sleeve have the same structure, including a nut sleeve body;

[0026] One end of the nut sleeve body is the main rib connection end, and the other end is the positioning insert rod connection end or the pre-compression spring sleeve connection end.

[0027] The outer wall of the nut sleeve body is provided with an anti-rotation structure and an annular structure. The annular structure is located on the outer wall of the nut sleeve body near the end of the positioning rod connection or the end of the pre-compression sleeve connection. The outer diameter of the annular structure is the same as the outer diameter of the nut sleeve body, and the end face of the annular structure is flush with the end face of the positioning rod connection or the end of the pre-compression sleeve connection.

[0028] Furthermore, the anti-rotation structure is a plane, arc-shaped surface, V-shaped surface, or groove surface provided on the outer wall of the nut sleeve body.

[0029] A precast pile connection structure includes a first end plate and a second end plate disposed at both ends of the precast pile body, and also includes the pre-compression mechanical joint described in this application. The first end plate is provided with a positioning rod fixing hole, and the positioning rod is installed on the first end plate. The second end plate is provided with a pre-compression spring sleeve mounting hole. A countersunk hole is provided on the precast pile body at a position corresponding to the pre-compression spring sleeve mounting hole. The pre-compression spring sleeve mounting hole and the countersunk hole form the receiving space. The pre-compression spring sleeve is installed on the second end plate and the spring piece is placed in the countersunk hole. The nest, the stop sleeve, and the spring are placed in the countersunk hole.

[0030] Adjacent precast pile sections are connected by the pre-stressed mechanical joint.

[0031] A precast pile connection structure includes the pre-stressed mechanical joint described in this application; two adjacent precast pile sections are connected through the pre-stressed mechanical joint.

[0032] Compared with the prior art, the pre-compression mechanical connector disclosed in this utility model has the following beneficial effects: The pre-compression mechanical connector disclosed in this application has a snap-fit ​​edge on the plug of the positioning rod and a snap-fit ​​surface on the spring piece of the pre-compression sleeve. The plug and the spring piece are locked together by the snap-fit ​​edge and the snap-fit ​​surface. Simultaneously, due to the inclusion of nesting, a stop sleeve, and a spring structure, after the plug and spring piece are locked together, the nesting can be fitted onto the outer wall of the spring piece, preventing the spring piece from opening under force and affecting the mechanical connection performance. In this application, after the plug and spring piece are locked together and the nesting is fitted onto the outer wall of the spring piece, a three-cone integrated structure is achieved between the nesting and the spring piece, and between the spring piece and the plug, effectively improving the connection performance of the mechanical connector. Furthermore, the near-line contact structure formed between the snap-fit ​​edge of the plug and the snap-fit ​​surface of the spring piece, i.e., an interlocking structure between the snap-fit ​​edge of the plug and the snap-fit ​​surface of the spring piece, further improves the connection performance between the plug and the spring piece and prevents radial slippage between them.

[0033] Furthermore, after the plug and spring are securely connected and nested on the outer wall of the spring, a pre-pressure is generated between the spring and the plug in the axial direction of the positioning rod. The pre-pressure generated between the spring and the plug in the axial direction of the positioning rod can eliminate the gap between the thread teeth, further improving the connection performance of the mechanical joint, thereby improving the connection performance of the precast pile.

[0034] Furthermore, since the plug and the spring contact and engage through the snap-fit ​​edge and snap-fit ​​surface, and the snap-fit ​​edge and snap-fit ​​surface have an approximately linear contact, a large free gap can exist between the plug and the spring after the plug is inserted into the spring. Thus, when the plug is inserted into any position of the spring, that is, when the snap-fit ​​edge of the plug contacts any position of the snap-fit ​​surface of the spring, the plug and the spring can be effectively snapped and fixed. Even if there are problems such as the tilt of the precast pile end face or the verticality of the precast pile during pile driving, which cause the positioning rod to shift or tilt, the snap-fit ​​edge of the plug and the snap-fit ​​surface of the spring can still be effectively snapped, thereby improving the connection performance of the precast pile. Attached Figure Description

[0035] Figure 1 This is a structural diagram of an embodiment of the pre-compression mechanical joint disclosed in this utility model, in which the mechanical joint is in the insertion state;

[0036] Figure 2 This is a structural diagram of the pre-compression mechanical joint disclosed in this utility model, showing the mechanical joint in an unconnected state.

[0037] Figure 3 This is a structural diagram of the pre-compression sleeve of the pre-compression mechanical joint disclosed in this utility model;

[0038] Figure 4This is a structural diagram of the positioning rod of the pre-compression mechanical joint disclosed in this utility model;

[0039] Figure 5 This is a structural diagram of the nested pre-compression mechanical joint disclosed in this utility model;

[0040] Figure 6 for Figure 5 A sectional view;

[0041] Figure 7 This is a structural diagram of the stop sleeve of the pre-compression mechanical joint disclosed in this utility model;

[0042] Figure 8 for Figure 7 A sectional view;

[0043] Figure 9 This is a structural diagram of another embodiment of the pre-compression mechanical joint disclosed in this utility model, including first and second nut sleeve structures;

[0044] Figure 10 This is a front view of the nut sleeve in the pre-compression mechanical joint disclosed in this utility model;

[0045] Figure 11 for Figure 10 It is the left view;

[0046] Figure 12 This is a structural diagram of one embodiment of the precast pile connection structure disclosed in this utility model.

[0047] Figure 13 This is a structural diagram of another embodiment of the precast pile connection structure disclosed in this utility model.

[0048] In the diagram: 1. Positioning rod; 10. Plug; 11. Snap-fit ​​edge; 12. Transition surface; 13. Guide surface; 14. Positioning rod fixing seat; 15. Rod body; 2. Pre-compression sleeve; 20. Spring piece; 21. Snap-fit ​​surface; 22. Pre-compression sleeve body; 3. Nesting; 30. Inner hole; 31. First stop edge; 32. Annular groove; 33. Spring snap-fit ​​part; 4. Stop sleeve; 40. Second stop edge; 41. Glue injection hole; 5. 6. Spring; 70. Accommodation space; 71. First nut sleeve; 72. Second nut sleeve; 73. Nut sleeve body; 74. Main reinforcement connection end; 75. Positioning rod connection end or pre-compression spring sleeve connection end; 76. Anti-rotation structure; 87. Ring structure; 88. First end plate; 89. Second end plate; 80. Positioning rod fixing hole; 81. Pre-compression spring sleeve installation hole; 90. Precast pile body; 91. Main reinforcement; 92. Sinking hole. Detailed Implementation

[0049] like Figure 1 and Figure 2As shown, the pre-compression mechanical joint disclosed in this utility model includes a positioning rod 1, a pre-compression sleeve 2, a nest 3, a stop sleeve 4, and a spring 5;

[0050] One end of the positioning rod 1 is provided with a plug 10, and the plug 10 is provided with a snap-fit ​​edge 11;

[0051] The pre-compression sleeve 2 is disposed in the receiving space 6. The end of the pre-compression sleeve 2 facing the inside of the receiving space 6 has a plurality of circumferentially distributed spring pieces 20. The inner sidewall of the spring piece 20 is provided with a conical snap-fit ​​surface 21. The plug 10 can be inserted into the pre-compression sleeve 2 and the snap-fit ​​edge 11 contacts and snaps into the snap-fit ​​surface 21.

[0052] The accommodating space 6 is also provided with the nest 3, the stop sleeve 4 and the spring 5;

[0053] Before the plug 10 is inserted into the pre-compressed sleeve 2, the stop sleeve 4 can compress the spring 5 within the receiving space 6, so that the nest 3 can be located in the space between the end of the spring piece 20 and the spring 5.

[0054] During the process of inserting the plug 10 into the pre-compression sleeve 2, the plug 10 can apply a pushing force to the stop sleeve 4 to release the compression of the spring 5. The rebound of the spring 5 pushes the nest 3 to move towards the side of the spring piece 20, so that the nest 3 is fitted around the outside of the spring piece 20.

[0055] Specifically, such as Figure 1 and Figure 2 As shown, the pre-compression mechanical joint disclosed in this embodiment includes a positioning rod 1, a pre-compression sleeve 2, a nest 3, a stop sleeve 4, and a spring 5; the positioning rod 1 is installed on a first component, and the pre-compression sleeve 2, the nest 3, the stop sleeve 4, and the spring 5 are installed on a second component. The first component and the second component can be interconnected through this pre-compression mechanical joint. A plug 10 is provided at one end of the positioning rod 1, and the plug 10 has a snap-fit ​​edge 11; a receiving space is provided in the second component, and the pre-compression sleeve 2 is disposed in the receiving space 6, such as... Figure 3As shown, the pre-compression sleeve 2 includes a pre-compression sleeve body 22 and a plurality of spring pieces 20 evenly distributed circumferentially at one end of the pre-compression sleeve body 22. In this embodiment, the spring pieces 20 are spring piece structures formed by a plurality of grooves machined along the axial direction at one end of the pre-compression sleeve 2. The end of the pre-compression sleeve 2 facing the interior of the receiving space 6 has a plurality of circumferentially distributed spring pieces 20. The spring pieces 20 can open and close radially. A tapered snap-fit ​​surface 21 is provided on the inner sidewall of the spring piece 20 near the end of the spring piece. The plug 10 can be inserted into the pre-compression sleeve 2 and the plug 2 can be snapped in. The edge 11 contacts and engages with the snap-fit ​​surface 21 of the spring piece 20; the receiving space 6 is also provided with a nest 3, a stop sleeve 4 and a spring 5; before the plug 10 is inserted into the pre-compressed spring piece 2, the stop sleeve 4 can compress the spring 5 in the receiving space 6, so that the nest 3 is located in the space between the end of the spring piece 20 and the spring 5; during the process of the plug 10 being inserted into the pre-compressed spring piece 2, the plug 10 can apply a pushing force to the stop sleeve 4 to release the compression of the spring 5, and the rebound of the spring 5 pushes the nest 3 to move towards the side of the spring piece 20, so that the nest 3 is fitted around the outside of the spring piece 20.

[0056] The pre-compression mechanical connector disclosed in this application has the following advantages: Because the plug of the positioning rod has a snap-fit ​​edge and the spring of the pre-compression sleeve has a snap-fit ​​surface, the plug and the spring are securely connected through the snap-fit ​​edge and the snap-fit ​​surface. Simultaneously, due to the presence of a nest 3, a stop sleeve 4, and a spring 5, after the plug and spring are securely connected, the nest can be fitted onto the outer wall of the spring, preventing the spring from opening under force and affecting the mechanical connection performance. In this application, after the plug and spring are securely connected and the nest is fitted onto the outer wall of the spring, the nest and spring, and the spring and plug, achieve a three-cone integrated structure, effectively improving the connection performance of the mechanical connector. Furthermore, the near-line contact structure formed between the snap-fit ​​edge of the plug and the snap-fit ​​surface of the spring, i.e., the interlocking structure between the snap-fit ​​edge of the plug and the snap-fit ​​surface of the spring, further improves the connection performance between the plug and the spring, preventing radial slippage between them.

[0057] Furthermore, after the plug and spring are securely connected and the nested sleeve is placed on the outer wall of the spring, a pre-pressure is generated between the spring and the plug in the axial direction of the positioning rod, thereby eliminating the gap between the positioning rod and the first component, and between the pre-pressure sleeve and the second frame. Specifically, for example, the first component and the second component are precast piles, the positioning rod is threaded to the nut sleeve (end plate) on the precast pile, and the pre-pressure sleeve is threaded to the nut sleeve (end plate) on the precast pile. Threaded connections generally have gaps between the thread teeth, which affect the connection performance of the mechanical joint. However, the pre-pressure generated between the spring and the plug in this application in the axial direction of the positioning rod can eliminate the gaps between the thread teeth, further improving the connection performance of the mechanical joint, thereby improving the connection performance of the precast pile.

[0058] Furthermore, since the plug and the spring are engaged through the snap-fit ​​edge and the snap-fit ​​surface, and the snap-fit ​​edge and the snap-fit ​​surface are in approximately linear contact, a large free gap can exist between the plug and the spring after the plug is inserted into the spring (the length of the snap-fit ​​surface along the axial direction of the pre-compression sleeve is the free gap between the plug and the spring of the pre-compression mechanical connector disclosed in this application). Thus, when the plug is inserted into any position of the spring, that is, when the snap-fit ​​edge of the plug contacts any position of the snap-fit ​​surface of the spring, the plug and the spring can be effectively engaged and fixed. Even if there is an inclination of the end face of the precast pile or problems such as verticality during pile driving that cause the positioning rod to shift or tilt, the snap-fit ​​edge of the plug and the snap-fit ​​surface of the spring can still be effectively engaged, thereby improving the connection performance of the precast pile.

[0059] Furthermore, the outer diameter of the plug 10 is larger than the outer diameter of the portion of the positioning rod 1 that connects to the plug 10, such that the edge of the plug 10 facing the positioning rod 1 forms the snap-fit ​​edge 11.

[0060] Specifically, in this embodiment, such as Figure 4 As shown, the positioning rod 1 has a positioning rod fixing seat 14 at one end and a plug 10 at the other end. The diameter of the rod gradually increases from the end connected to the plug 10 to the end connected to the positioning rod fixing seat 14. The outer diameter of the end of the positioning rod 1 connected to the plug 10 is smaller than the outer diameter of the plug 10, so that the edge of the plug facing the end of the rod forms a snap-fit ​​edge 11. This structure can not only improve the strength of the positioning rod, but also facilitate processing.

[0061] Furthermore, the radial dimension of the transition surface 12 at the end of the plug 10 that connects to the positioning rod 1 gradually increases along the insertion direction of the plug 10.

[0062] Specifically, such as Figure 4 As shown, the end face of the end of the insertion rod 10 connected to the rod body of the positioning insertion rod 1 (the transition surface between the outer wall of the plug and the outer wall of the rod body) can be a surface perpendicular to the central axis of the positioning insertion rod 1. Preferably, the transition surface is a structure with radial dimensions that gradually increase along the insertion direction of the plug, such as a conical surface, an arc surface, or other curved surface. This not only avoids stress concentration but also increases the strength of the snap-fit ​​edge, preventing damage to the snap-fit ​​edge when the positioning insertion rod snaps into the pre-compression sleeve.

[0063] Furthermore, the plug 10 is also provided with a guide surface 13.

[0064] Specifically, in this embodiment, the plug 10 has a cylindrical structure. This cylindrical structure further enhances the strength of the snap-fit ​​edge, preventing damage to the snap-fit ​​edge when the positioning rod engages with the pre-compression spring sleeve. Preferably, a guide surface 13 is provided on the side of the plug 10 near the plug end. The guide surface 13 can be a conical surface, an arc surface, or other smooth curved surface. Providing a guide surface not only facilitates guidance during the insertion of the positioning rod but also reduces wear between the plug and the spring, ensuring the strength of the mechanical connection. When the plug 10 has a guide surface 13, preferably, the terminating end of the guide surface 13 (the end of the guide surface facing the positioning rod) is a certain distance from the snap-fit ​​edge to ensure the strength of the snap-fit ​​edge.

[0065] Furthermore, the nest 3 is provided with an inner hole 30 that can be fitted around the outside of the spring piece 20, and the inner hole 30 is provided with an inwardly protruding first stop 31 at one end away from the spring piece 20;

[0066] The outer side wall of the stop sleeve 4 is provided with an outwardly protruding second stop edge 40 at the end away from the spring piece 20;

[0067] Before the plug 10 is inserted into the pre-compression sleeve 2, the stop sleeve 4 is placed in the inner hole 30 of the nest 3 and the end of the spring piece 20 abuts against the end of the stop sleeve 4. The nest 3 compresses the spring 5 in the receiving space 6 by the mutual abutment of the first stop edge 31 and the second stop edge 40.

[0068] During the process of inserting the plug 10 into the pre-compression sleeve 2, the plug 10 can apply a pushing force to the stop sleeve 4, causing the second stop edge 40 to break to release the obstruction between the stop sleeve 4 and the nest 3. Then, the rebound of the spring 5 pushes the nest 3 to move towards the side of the spring piece 20, so that the nest 3 is fitted around the outside of the spring piece 20.

[0069] Specifically, in this embodiment, such as Figure 5 and Figure 6 As shown, the nest 3 has an inner hole 30. When the spring 5 pushes the nest 3 towards the spring piece 20, the nest 3 can fit onto the outer wall of the spring piece 20 through the inner hole 30, thus radially holding the spring piece and preventing it from radially opening when subjected to the force of the plug. A first protruding flange 31 is provided at the end of the inner hole 30 away from the spring piece 20, such as... Figure 7 and Figure 8As shown, the outer wall of the stop sleeve 4 is provided with a second stop 40. The outer diameter of the stop sleeve 4 is equal to or less than the inner diameter of the first stop 31, so that the stop sleeve 4 can be set in the inner hole 30 of the nest 3. Before the plug 10 is inserted into the pre-compression sleeve 2, the first stop 31 and the second stop 40 can abut against each other. Then, under the abutment between the end of the spring piece 20 and the end of the stop sleeve 4, the stop sleeve 4 and the nest 3 compress the spring in contact with the nest through the abutment of the two stops. During the process of the plug 10 being inserted into the pre-compression sleeve 2, the plug 10 can pass through the spring piece 20 and apply force to the stop sleeve 4. The first stop 31 and / or the second stop 40 are damaged, and the stop sleeve 4 enters the inside of the spring 5. Under the pushing action of the spring 5, the nest 3 moves to the side of the spring piece 20 and is clamped on the outer wall of the spring piece 20. Preferably, the stop sleeve 4 is made of rubber or plastic, which not only reduces costs but also ensures that the stop edge is easily damaged when subjected to the force of the plug, thereby ensuring that the spring can effectively push the nest towards and clamp onto the spring piece.

[0070] Furthermore, the outer diameter of the nest 3 is less than or equal to the inner diameter of the accommodating space 6; the inner hole 30 of the nest 3 is a tapered hole.

[0071] Preferably, the outer diameter of the nest 3 is consistent with the inner diameter of the receiving space 6, that is, the outer diameter of the nest 3 is equal to or slightly smaller than the inner diameter of the receiving space 6. Thus, when the nest 3 is fitted onto the outer wall of the spring piece 20, the inner wall of the receiving space 6 can also effectively fit the nest 3, further improving the strength of the nest 3 and thus avoiding damage to the nest 3. This also effectively prevents the spring piece 20 from opening radially after the plug 10 and the spring piece 20 are engaged, thereby further improving the connection performance of the mechanical joint. The inner hole 30 in the nest 3 can be a straight hole, a tapered hole, or other types of hole structures, so that under the pushing action of the spring, the nest can be clamped on the outside of the spring piece. Preferably, the inner hole of the nest 3 is a tapered hole. After the plug 10 is inserted into the spring piece 20 and engages with the spring piece 20, and the nest 3 is clamped on the outer wall of the spring piece 20, the wall surface of the inner hole of the nest 3 can effectively fit with the outer wall surface of the spring piece 20. At the same time, the engaging surface 21 of the spring piece 20 and the engaging edge 11 of the plug 10 are also in an effective engaging state, thereby realizing a three-cone integrated structure of the nest and the spring piece, and the spring piece and the plug, which effectively improves the connection performance of the mechanical connector.

[0072] Furthermore, an annular groove 32 is machined on the outer wall of the end of the nest 3 facing the spring 5, and a spring locking part 33 is formed at the end of the nest 3 facing the spring 5, and one end of the spring 5 can be fitted onto the spring locking part 33.

[0073] Specifically, such as Figure 6As shown, an annular groove 32 is machined at one end of the nest 3 facing the spring 5, so that a spring snap-fit ​​part 33 is formed at the end of the nest 3 facing the spring 5. That is, the outer diameter of the end of the nest 3 facing the spring 5 is smaller, so that it can be inserted into the spring 5, and the end face of the spring abuts against the transition surface. The nest is provided with a spring snap-fit ​​part, which can effectively ensure the movement of the spring pushing the nest, thereby ensuring the connection performance of the mechanical joint.

[0074] Furthermore, the stop sleeve 4 is provided with an injection hole 41.

[0075] Specifically, such as Figure 8 As shown, the stop sleeve 4 is provided with an injection hole, which allows for easy injection of epoxy resin structural adhesive into the receiving space.

[0076] Furthermore, the accommodating space 6 is also filled with epoxy resin adhesive.

[0077] Specifically, epoxy resin is injected into the receiving space 6. The epoxy resin not only acts as an anti-corrosion agent, but also fills the gaps in the receiving space after it solidifies, which can prevent the spring from opening radially and further improve the connection performance of the mechanical joint.

[0078] Furthermore, it also includes a first nut sleeve 70 and / or a second nut sleeve 71;

[0079] One end of the first nut sleeve 70 is used to connect with the main rib 90, and the other end is used to connect with the positioning rod 1;

[0080] One end of the second nut sleeve 71 is used to connect with the main rib 90. The cavity of the second nut sleeve 71 is the receiving space 6. The pre-compression sleeve 2, the nest 3, the stop sleeve 4 and the spring 5 are arranged in the second nut sleeve 71.

[0081] Specifically, in this embodiment, such as Figure 9 As shown, the pre-stressed mechanical joint also includes a first nut sleeve 70 and / or a second nut sleeve 71. One end of the first nut sleeve 70 and the second nut sleeve 71 are both main reinforcement connection ends that can be connected to the main reinforcement. The first nut sleeve 70 and the second nut sleeve 71 are set at both ends of the main reinforcement of the precast pile. The other end of the first nut sleeve 70 can be connected to the positioning rod 1. The second nut sleeve 71 is equipped with a pre-stressing spring sleeve 2, a nest 3, a stop sleeve 4, and a spring 5. By setting the first nut sleeve and the second nut sleeve, the pre-stressed mechanical joint can be applied to the mechanical connection of non-end plate precast piles.

[0082] Furthermore, the first nut sleeve 70 and the second nut sleeve 71 have the same structure, including the nut sleeve body 72;

[0083] One end of the nut sleeve body 72 is the main rib connection end 73, and the other end is the positioning insert rod connection end or the pre-compression spring sleeve connection end 74.

[0084] The outer wall of the nut sleeve body 72 is provided with an anti-rotation structure 75 and an annular structure 76. The annular structure 76 is located on the outer wall of the nut sleeve body 72 near the end of the positioning rod connection or the pre-compression sleeve connection 74. The outer diameter of the annular structure 76 is the same as the outer diameter of the nut sleeve body 72, and the annular structure 76 is flush with the end face of the positioning rod connection or the pre-compression sleeve connection 74.

[0085] Specifically, in this embodiment, as Figure 10 and Figure 11 As shown, the outer wall of the nut sleeve body 72 is provided with an anti-rotation structure 75 and an annular structure 76. The outer diameter of the annular structure 76 is the same as the outer diameter of the nut sleeve body 72, and the annular structure 76 is flush with the end face of the positioning rod connection end or the preload spring sleeve connection end 74. That is, the nut sleeve adopts a flange polygonal nut sleeve structure. By setting the anti-rotation structure on the outer wall of the nut sleeve body, the gripping force between the nut sleeve and the concrete is increased, and the polygonal structure of the nut sleeve creates a mechanical embedding effect with the concrete. Furthermore, when the concrete hardens and shrinks, it can generate lateral pressure on the polygonal nut, and the friction of the anti-rotation structure (concave and convex surfaces) resists slippage and rotation. The annular structure of the nut sleeve body 72 can prevent the formation of a cutting edge structure when the nut sleeve is connected to the tensioning plate for tensioning, thereby avoiding damage to the tensioning plate and extending the service life of the tensioning plate. Meanwhile, since there is no dimensional shrinkage at the bottom of the nut sleeve, a greater preload can be generated between the nut sleeve and the concrete, thereby reducing the damage to the end face of the concrete pile caused by the preload (such as cracks, fissures and breakage between the nut sleeve and the end of the precast pile).

[0086] Furthermore, the anti-rotation structure 75 is a plane, arc-shaped surface, V-shaped surface, or groove surface provided on the outer wall of the nut sleeve body 72.

[0087] Specifically, in this embodiment, preferably, the anti-rotation structure 75 is a plane disposed on the outer wall of the nut sleeve body 72, that is, the part of the nut sleeve body with the anti-rotation structure has a polygonal cross-section, which not only has a simple structure, but also has a large gripping force, embedding effect, friction force and preload with concrete. The anti-rotation structure 75 can also be disposed on the arc-shaped surface, V-shaped surface or groove surface of the nut sleeve body.

[0088] A precast pile connection structure includes a first end plate 80 and a second end plate 81 disposed at both ends of a precast pile body 9, and also includes the pre-compression mechanical joint described in this application. The first end plate 80 is provided with a positioning rod fixing hole 82, and the positioning rod 1 is installed on the first end plate 80. The second end plate 81 is provided with a pre-compression spring sleeve mounting hole 83. The precast pile body 9 is provided with a countersunk hole 91 at a position corresponding to the pre-compression spring sleeve mounting hole 83. The pre-compression spring sleeve mounting hole 83 and the countersunk hole 91 form the receiving space 6. The pre-compression spring sleeve 2 is installed on the second end plate 81 and the spring piece 20 is placed in the countersunk hole 91. The nest 3, the stop sleeve 4, and the spring 5 are placed in the countersunk hole 91.

[0089] Adjacent precast pile sections are connected by the pre-stressed mechanical joint.

[0090] Specifically, Figure 12 This application discloses a pre-stressed mechanical joint for connecting precast piles. In this embodiment, the precast pile includes a precast pile body 9 and a reinforcing cage disposed within the precast pile body 9. The precast pile body 9 has a first end plate 80 and a second end plate 81 at both ends, respectively. The first end plate 80 and the second end plate 81 are connected to the two ends of the main reinforcing bars of the reinforcing cage. The application also includes the pre-stressed mechanical joint described in this application. The first end plate 80 has a positioning rod fixing hole 82, and a positioning rod 1 is installed on the first end plate 80. The second end plate 81 has a pre-stressing spring sleeve mounting hole 83. In this embodiment, both the first end plate 80 and the second end plate 81 can be standard end plates. Multiple main reinforcing bar fixing holes and threaded holes are evenly distributed circumferentially on the end plates, and the main reinforcing bar fixing holes and threaded holes are interconnected to form a series of... The structure resembles a gourd. The main reinforcement fixing hole is used to fix the end of the main reinforcement, and the threaded hole is used to connect with the positioning rod or the pre-compression sleeve. The precast pile body 9 has a countersunk hole 91 at the position corresponding to the pre-compression sleeve installation hole 83. The pre-compression sleeve installation hole 83 and the countersunk hole 91 form a receiving space 6. The pre-compression sleeve 2 is installed on the second end plate 81 and the spring piece 21 is placed in the countersunk hole 70. The nest 3, the stop sleeve 4 and the spring 5 are placed in the countersunk hole 91. Two adjacent precast piles are connected by the pre-compression mechanical joint disclosed in this application. That is, a positioning rod is installed on the threaded hole of the end plate at one end of the precast pile, and a pre-compression sleeve is installed in the threaded hole of the end plate at the other end of the precast pile. The nest 3, the stop sleeve 4 and the spring 5 are set in the countersunk hole of the precast pile body. The two connected precast piles can be connected to each other through the pre-compression mechanical joint. Furthermore, in order to further improve the connection performance between precast piles, structural adhesives such as epoxy resin are injected into the end face of the precast piles and into the sinkhole to improve corrosion resistance. At the same time, after the epoxy resin solidifies, it can effectively fill the space inside the mechanical joint, thereby improving the connection strength of the mechanical joint.

[0091] A precast pile connection structure includes the pre-stressed mechanical joint described in this application; two adjacent precast pile sections are connected through the pre-stressed mechanical joint.

[0092] Specifically, Figure 13 In another embodiment of connecting precast piles using the pre-compression mechanical structure disclosed in this application, the precast pile includes a precast pile body 9 and a reinforcing cage disposed within the precast pile body 9. The precast pile body 9 has a first nut sleeve 70 and a second nut sleeve 71 at both ends, respectively connected to the two ends of the main reinforcing bars 90 of the reinforcing cage. A fixed insertion rod 1 is installed on the first nut sleeve 70. The sleeve cavity of the second nut sleeve 71 is a receiving space 6. A pre-compression spring sleeve 2 is installed in the second nut sleeve 71. The second nut sleeve 71 also has a nest 3, a stop sleeve 4, and a spring 5. In this embodiment, both the first nut sleeve and the second nut sleeve can be standard parts. Adjacent precast pile sections are connected through the pre-compression mechanical joint, i.e., a fixed insertion rod is installed on the first nut sleeve of the precast pile, and the pre-compression spring sleeve 2, nest 3, stop sleeve 4, and spring 5 are installed on the second nut sleeve of the precast pile. The two connected precast pile sections can be interconnected through this pre-compression mechanical joint. Furthermore, in order to further improve the connection performance between precast piles, epoxy resin and other structural adhesives are injected into the end face of the precast piles and into the second nut sleeve to improve corrosion resistance. At the same time, after the epoxy resin solidifies, it can effectively fill the space inside the mechanical joint, thereby improving the connection strength of the mechanical joint.

[0093] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pre-compression mechanical joint, characterized in that: It includes a positioning rod (1), a pre-compression sleeve (2), a nest (3), a stop sleeve (4), and a spring (5); One end of the positioning rod (1) is provided with a plug (10), and the plug (10) is provided with a snap-fit ​​edge (11). The pre-compression sleeve (2) is disposed in the receiving space (6). The end of the pre-compression sleeve (2) facing the inside of the receiving space (6) has a plurality of circumferentially distributed spring pieces (20). The inner sidewall of the spring piece (20) is provided with a conical snap-fit ​​surface (21). The plug (10) can be inserted into the pre-compression sleeve (2) and the snap-fit ​​edge (11) contacts and snaps with the snap-fit ​​surface (21). The accommodating space (6) is also provided with the nest (3), the stop sleeve (4) and the spring (5); Before the plug (10) is inserted into the pre-compressed sleeve (2), the stop sleeve (4) can compress the spring (5) within the receiving space (6), so that the nest (3) can be located in the space between the end of the spring piece (20) and the spring (5); During the process of inserting the plug (10) into the pre-compression sleeve (2), the plug (10) can apply a thrust to the stop sleeve (4) to release the compression of the spring (5). The rebound of the spring (5) pushes the nest (3) to move towards the side of the spring piece (20), so that the nest (3) is fitted on the outside of the spring piece (20).

2. The pre-compression mechanical joint according to claim 1, characterized in that: The outer diameter of the plug (10) is larger than the outer diameter of the part of the positioning rod (1) that connects to the plug (10), such that the edge of the plug (10) facing the positioning rod (1) forms the snap-fit ​​edge (11).

3. The pre-compression mechanical joint according to claim 2, characterized in that: The radial dimension of the transition surface (12) at the end where the plug (10) is connected to the positioning rod (1) gradually increases along the insertion direction of the plug (10).

4. The pre-compression mechanical joint according to claim 1, characterized in that: The plug (10) is also provided with a guide surface (13).

5. The pre-compression mechanical joint according to claim 1, characterized in that: The nest (3) is provided with an inner hole (30) that can be fitted around the outside of the spring piece (20), and a first flange (31) protruding inward is provided at one end of the inner hole (30) away from the spring piece (20). The outer side wall of the stop sleeve (4) is provided with an outwardly protruding second stop (40) at the end away from the spring piece (20). Before the plug (10) is inserted into the pre-compression sleeve (2), the stop sleeve (4) is placed in the inner hole (30) of the nest (3) and the end of the spring piece (20) abuts against the end of the stop sleeve (4). Through the mutual abutment of the first stop (31) and the second stop (40), the nest (3) compresses the spring (5) in the receiving space (6). During the process of inserting the plug (10) into the pre-compression sleeve (2), the plug (10) can apply a pushing force to the stop sleeve (4), causing the first stop edge (31) and / or the second stop edge (40) to break to release the stop sleeve (4) from the nest (3), and then the rebound of the spring (5) pushes the nest (3) to move towards the side of the spring piece (20), so that the nest (3) is fitted on the outside of the spring piece (20).

6. The pre-compression mechanical joint according to claim 5, characterized in that: The outer diameter of the nest (3) is less than or equal to the inner diameter of the accommodating space (6); the inner hole (30) of the nest (3) is a tapered hole.

7. The pre-compression mechanical joint according to claim 6, characterized in that: An annular groove (32) is machined on the outer wall of the end of the nest (3) facing the spring (5), and a spring snap-fit ​​part (33) is formed at the end of the nest (3) facing the spring (5), and one end of the spring (5) can be fitted onto the spring snap-fit ​​part (33).

8. The pre-compression mechanical joint according to claim 1, characterized in that: The stop sleeve (4) is provided with an injection hole (41).

9. The pre-compression mechanical joint according to claim 1, characterized in that: The containment space (6) is also filled with epoxy resin adhesive.

10. The pre-compression mechanical joint according to any one of claims 1 to 9, characterized in that: It also includes a first nut sleeve (70) and / or a second nut sleeve (71); One end of the first nut sleeve (70) is used to connect with the main rib (90), and the other end is used to connect with the positioning rod (1); One end of the second nut sleeve (71) is used to connect with the main rib (90). The cavity of the second nut sleeve (71) is the receiving space (6). The pre-compression sleeve (2), the nest (3), the stop sleeve (4) and the spring (5) are arranged in the second nut sleeve (71).

11. The pre-compression mechanical joint according to claim 10, characterized in that: The first nut sleeve (70) and the second nut sleeve (71) have the same structure, including the nut sleeve body (72); One end of the nut sleeve body (72) is the main rib connection end (73), and the other end is the positioning insert rod connection end or the pre-compression spring sleeve connection end (74). The outer wall of the nut sleeve body (72) is provided with an anti-rotation structure (75) and an annular structure (76). The annular structure (76) is located on the outer wall of the nut sleeve body (72) near the end of the positioning rod connection or the pre-compression sleeve connection (74). The outer diameter of the annular structure (76) is consistent with the outer diameter of the nut sleeve body (72), and the annular structure (76) is flush with the end face of the positioning rod connection or the pre-compression sleeve connection (74).

12. The pre-compression mechanical joint according to claim 11, characterized in that: The anti-rotation structure (75) is a plane, arc-shaped surface, V-shaped surface or groove surface provided on the outer wall of the nut sleeve body (72).

13. A precast pile connection structure, characterized in that: The precast pile body (9) includes a first end plate (80) and a second end plate (81) at both ends, and also includes a pre-compression mechanical joint as described in any one of claims 1 to 9. The first end plate (80) is provided with a positioning rod fixing hole (82), the positioning rod (1) is installed on the first end plate (80), the second end plate (81) is provided with a pre-compression spring sleeve mounting hole (83), the precast pile body (9) is provided with a countersinking hole (91) at a position corresponding to the pre-compression spring sleeve mounting hole (83), the pre-compression spring sleeve mounting hole (83) and the countersinking hole (91) form the receiving space (6), the pre-compression spring sleeve (2) is installed on the second end plate (81) and the spring piece (20) is placed in the countersinking hole (91), the nest (3), the stop sleeve (4) and the spring (5) are placed in the countersinking hole (91); Adjacent precast pile sections are connected by the pre-stressed mechanical joint.

14. A precast pile connection structure, characterized in that: Includes the pre-compression mechanical joint as described in any one of claims 10 to 12; Adjacent precast pile sections are connected by the pre-stressed mechanical joint.

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