Mechanical joint and precast concrete pile

Abstract

The application discloses a mechanical joint and a precast concrete pile, wherein the mechanical joint comprises a plug rod and a connecting piece; a double dovetail taper wedge clamping structure is arranged between the plug of the plug rod and the elastic sheet of the connecting piece; when the elastic sheet is in a free state, the small-diameter end diameter of the double dovetail taper clamping groove is smaller than or equal to the small-diameter end diameter of the double dovetail taper clamping table; when the plug is inserted into the connecting piece, the plug and the elastic sheet realize the clamping of the plug rod and the connecting piece through the double dovetail taper wedge clamping. The mechanical joint disclosed by the application solves the problem that an axial free space exists between the elastic clamping and the plug of the existing mechanical joint, and the pulling resistance and the shearing resistance of the pile connection are reduced. Meanwhile, the contact surface between the elastic sheet and the plug is multiplied, so that the deformation amount of the elastic sheet and the plug when the plug is subjected to the pulling force or the shearing force is greatly reduced, and the pulling resistance and the shearing resistance of the pile connection are improved.

Description

Technical Field

[0001] This invention relates to the field of precast pile technology, and in particular to a mechanical joint and a precast concrete pile. Background Technology

[0002] Most engineering piles (precast piles) are multi-section piles, and the ends of existing precast concrete piles are generally connected quickly between piles using mechanical joints.

[0003] However, existing precast piles have the following problems: 1. The end face of the precast concrete pile has a certain degree of inclination. Table 6 of the national standard GB13476-2009 stipulates the allowable deviation of pipe pile dimensions: for pipe piles with a diameter of 300mm to 700mm, the allowable inclination distance of the end face is -2mm to +5mm, and for pipe piles with a diameter of 800mm to 1400mm, the allowable inclination distance of the end face is -4mm to +7mm. Therefore, when two piles (with a diameter of 300mm to 700mm) are joined together, considering only the inclination of the end face of one pile, there will be a maximum gap of 5mm; 2. Precast concrete piles have a certain degree of verticality during pile driving. Section 7.4.3 of the "Requirements for Relevant Specifications for Precast Pile Construction" stipulates that the verticality of the pile during insertion shall not exceed 0.5%.

[0004] Because of the two problems mentioned above with precast piles, when using existing mechanical joints for pile connection, there may be issues such as over-insertion or under-insertion of the insertion rod into the connector, which can reduce the pull-out strength of the connected pile or cause connection failure.

[0005] To address the issue of reduced pull-out strength or connection failure caused by over- or under-insertion of the insertion rod in the connector, patent 202020570599.3, entitled "A Toothed Mechanical Joint and Concrete Pile Connection Structure," discloses a mechanical joint with a toothed structure. This mechanical joint can largely solve the problem of reduced pull-out strength or connection failure caused by over- or under-insertion of the insertion rod in the connector. However, due to the toothed structure used for locking, there will still be an axial gap of 0.5 times the tooth spacing between the insertion rod plug and the spring clip of the connector, which will reduce the pull-out performance of the precast concrete pile connection to a certain extent. Summary of the Invention

[0006] The present invention provides a mechanical joint to address the above-mentioned problems.

[0007] The technical means employed in this invention are as follows:

[0008] A mechanical connector, comprising a insertion rod and a connecting element;

[0009] The insertion rod includes an insertion rod fixing seat with external threads, a plug with a double dovetail taper clamp, and a plug connection part for connecting the insertion rod fixing part and the plug.

[0010] The connector includes a connector body with a sleeve structure and a plurality of spring pieces disposed at one end of the connector body and arranged circumferentially along the connector body. The inner wall of the spring pieces is provided with a double dovetail taper groove.

[0011] When the spring tab of the connector is in a free state, the small diameter end diameter of the double dovetail taper groove is less than or equal to the small diameter end diameter of the double dovetail taper table.

[0012] When the plug is inserted into the connector, the plurality of spring tabs can open along the radial direction of the connector so that the double dovetail taper slot is engaged on the double dovetail taper plate.

[0013] Furthermore, it also includes a spring, which is disposed at the end of the connector where the spring piece is located. When the plug is inserted into the connector, the end of the spring facing the connector is fitted onto the outer wall of the spring piece, and the end of the spring is tangent to the outer wall of the spring piece.

[0014] Furthermore, the double dovetail taper groove is also provided with teeth.

[0015] Furthermore, it also includes a baffle plate, which is disposed at the end of the spring before the plug is inserted into the connector to compress the spring and prevent the spring from being fitted onto the outer wall of the spring towards the connector.

[0016] When the plug is inserted into the connector, the baffle breaks or deforms under the thrust of the plug, thereby releasing the compression of the spring. The spring then recovers its deformation, causing the end of the spring facing the connector to fit onto the outer wall of the spring piece.

[0017] Furthermore, the end of the spring facing the connector includes at least two tightly fitted spring coils, and the end of the spring is tangent to the outer wall of the spring sheet.

[0018] Furthermore, the length of each dovetail taper cladding in the double dovetail taper cladding and the length of each dovetail taper slot in the double dovetail taper cladding are both greater than or equal to 7mm.

[0019] Furthermore, the plug connection part is a conical column structure, and the connector has a conical receiving cavity, the taper of which is consistent with the taper of the conical column structure.

[0020] Furthermore, it also includes a sleeve, in which the connector is installed and the spring is placed inside the sleeve.

[0021] Furthermore, when the plug is inserted into the connector and one end of the spring facing the connector is fitted onto the outer wall of the spring piece, the end of the spring enters the gap between the spring piece and the inner wall of the sleeve.

[0022] Furthermore, the end of the plug is provided with a guide surface; the plug holder is provided with a clamping structure for clamping the plug during installation.

[0023] Furthermore, the baffle includes a baffle body and a plurality of baffle arms circumferentially disposed on the baffle body.

[0024] A precast concrete pile includes a precast concrete pile body and the mechanical joint disclosed in this invention, wherein the mechanical joint is installed at the end of the precast concrete pile body.

[0025] Compared with the prior art, the mechanical connector disclosed in this invention has the following beneficial effects: In this invention, because the plug and the spring clip are respectively provided with a double dovetail conical locking platform and a double dovetail conical locking groove, a double dovetail conical wedge structure is formed between the plug and the spring clip. Furthermore, because the small diameter of the double dovetail conical locking groove is less than or equal to the small diameter of the double dovetail conical locking platform, when the plug is inserted into the connector, the two edges of the double dovetail conical locking groove can engage with the double dovetail conical locking platform in any state, thus solving the problem of axial free space between the spring clip and the plug in existing mechanical connectors. The problem of reduced pull-out and shear resistance of precast concrete pile connections is addressed by the fact that, in any state of engagement between the insert and the connector, at least two sides of the double dovetail taper groove engage with the double dovetail taper platform. This increases the contact area between the spring and the plug. In particular, the double dovetail taper wedge structure increases the contact points between the spring and the plug by multiple times. As a result, when the plug is subjected to pull-out or shear forces, the deformation of the spring and the plug is greatly reduced compared to existing mechanical joints, further improving the pull-out and shear resistance of the precast concrete pile. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the mechanical joint disclosed in this invention;

[0027] Figure 2 for Figure 1 A sectional view;

[0028] Figure 3 This is a schematic diagram of the insertion rod of the mechanical connector disclosed in this invention;

[0029] Figure 4 This is a schematic diagram of the structure of the connector of the mechanical joint disclosed in this invention;

[0030] Figure 5 for Figure 4 A sectional view;

[0031] Figure 6 for Figure 4 The left view;

[0032] Figure 7 This is a schematic diagram of the mechanical connector disclosed in this invention when the insertion rod and the connecting piece are fully engaged;

[0033] Figure 8 for Figure 7 Sectional view at point BB;

[0034] Figure 9 This is a schematic diagram of the mechanical connector disclosed in this invention when the insertion rod and the connecting piece have a certain degree of axial free movement;

[0035] Figure 10 for Figure 9 Sectional view at CC;

[0036] Figure 11 This is a schematic diagram of the mechanical joint disclosed in this invention when it has a spring structure;

[0037] Figure 12 This is a schematic diagram of the mechanical joint disclosed in this invention, which has a baffle structure and the baffle compresses the spring so that one end of the spring cannot be fitted onto the outer wall of the spring piece.

[0038] Figure 13 This is an axial view of the baffle of the mechanical joint disclosed in this invention;

[0039] Figure 14 This is a side view of the baffle of the mechanical joint disclosed in this invention;

[0040] Figure 15 This is a schematic diagram of a first embodiment of a precast concrete pile having the mechanical joint disclosed in this invention.

[0041] Figure 16 for Figure 15 Enlarged view of the area within the dashed box;

[0042] Figure 17 This is a schematic diagram of the mechanical joint disclosed in this invention when it has a sleeve structure;

[0043] Figure 18 for Figure 17 A sectional view;

[0044] Figure 19 This is a schematic diagram of the mechanical joint disclosed in this invention, in which the baffle is disposed inside the sleeve and the baffle compresses the spring so that one end of the spring cannot be fitted onto the outer wall of the spring piece.

[0045] Figure 20 This is a schematic diagram of a second embodiment of a precast concrete pile having the mechanical joint disclosed in this invention.

[0046] Figure 21 for Figure 20 A magnified view of a portion within the dashed box;

[0047] Figure 22 In a second embodiment of the mechanical connector disclosed in this invention, the dovetail taper groove is provided with teeth.

[0048] In the diagram: 1. Insert rod, 10. Insert rod fixing seat, 11. Plug, 12. Plug connection part, 13. Dovetail taper clamping platform, 14. Guide surface, 15. Clamping structure, 2. Connector, 20. Connector body, 21. Spring piece, 22. Dovetail taper groove, 23. Conical receiving cavity, 24. Groove, 25. Circular enlarged hole, 26. Arc part, 27. Conical part, 28. Tooth, 3. Spring, 30. Spring ring, 4. Baffle, 40. Baffle body, 41. Baffle arm, 5. Sleeve, 6. Precast concrete pile body, 60. End plate, 61. Threaded mounting hole, 62. Connector receiving space, 63. First nut sleeve, 64. Second nut sleeve, 65. Main reinforcement. Detailed Implementation

[0049] Example 1

[0050] like Figure 1 and Figure 2 The mechanical connector disclosed in this invention includes a plug rod 1 and a connector 2;

[0051] like Figure 3 As shown, the insertion rod 1 includes an insertion rod fixing seat 10 with external threads, a plug 11 with a double dovetail tapered clamping platform 13, and a plug connecting part 12 for connecting the insertion rod fixing part 10 and the plug 11; the double dovetail tapered clamping platform is two truncated cone structures arranged in sequence.

[0052] like Figure 4 , Figure 5 and Figure 6As shown, the connector 2 includes a connector body 20 with a sleeve structure and a plurality of spring pieces 21 disposed at one end of the connector body 20 and arranged circumferentially along the connector body 20. The inner wall of the spring piece 21 is provided with a double dovetail taper groove 22. In this embodiment, the connector 2 is a sleeve structure as a whole. One end of the connector 2 is machined with a plurality of grooves 24 in the axial direction. The plurality of grooves 24 are evenly distributed circumferentially so that one end of the connector forms a plurality of spring pieces 21. In this embodiment, the number of grooves is 4 and the number of spring pieces is also 4. The number of spring pieces can be set as needed. In order to reduce the stress concentration at the root of the groove during the deformation of the spring piece, in this embodiment, the root of the groove is machined into a circular enlarged hole 25 structure to ensure that the connector is not damaged during the opening of the spring piece. The double dovetail taper groove is a structure of two tapered grooves arranged sequentially on the inner wall of the spring piece with the same taper as the double dovetail taper groove.

[0053] When the spring piece 21 of the connector 2 is in a free state, the small diameter end diameter d1 of the double dovetail taper groove 22 is less than or equal to the small diameter end diameter D1 of the double dovetail taper table 13.

[0054] When the plug 11 is inserted into the connector 2, the plurality of spring pieces 21 can open along the radial direction of the connector 2 so that the double dovetail taper slot 22 is engaged on the double dovetail taper table 13.

[0055] In this invention, the plug and spring clip are respectively provided with a double dovetail conical locking platform and a double dovetail conical locking groove, forming a double dovetail conical wedge structure between the plug and the spring clip. Furthermore, when the spring clip of the connector is in a free state, the small-diameter end diameter of the double dovetail conical locking groove is less than or equal to the small-diameter end diameter of the double dovetail conical locking platform. This ensures that when the plug is inserted into the connector, the two groove edges of the double dovetail conical locking groove can engage with the double dovetail conical locking platform in any state. This solves the problem of axial free clearance between the spring clip and the plug in existing mechanical joints, which reduces the pull-out and shear resistance of precast concrete pile connections. Specifically, as shown... Figures 7 to 10 As shown, where, Figure 7 and Figure 8 The small-diameter end of the double dovetail taper slot is equal to the small-diameter end of the double dovetail taper clamping stage, and the plug is fully engaged with the spring after being inserted into the spring. In this state, the double dovetail taper slot and the double dovetail taper clamping stage are completely in contact, and the plug and spring are in surface contact engagement. Figure 9 and Figure 10When the small diameter of the double dovetail taper groove is equal to the small diameter of the double dovetail taper clamping platform, and the plug has a certain axial free distance L relative to the clamping platform after being inserted into the spring (the insertion rod is over-inserted or under-inserted into the spring to a certain extent), or when the small diameter of the double dovetail taper groove is smaller than the small diameter of the double dovetail taper clamping platform, the two groove edges of the double dovetail taper groove engage with the double dovetail taper clamping platform when the plug is inserted into the spring of the connector. That is, the double dovetail taper groove can engage with the double dovetail taper clamping platform in the entire axial free surface (the taper surface of the taper clamping platform) without forming an axial free gap. This ensures the pull-out and shear resistance of the precast concrete piles when using the mechanical joint disclosed in this invention for precast concrete pile connection.

[0056] Furthermore, since at least two edges of the double dovetail taper groove engage with the double dovetail taper platform in any engagement state between the plug and connector (e.g., when the small diameter of the double dovetail taper groove is equal to the small diameter of the double dovetail taper platform and the plug is fully engaged with the spring, the double dovetail taper groove and the double dovetail taper platform are in surface contact; when the small diameter of the double dovetail taper groove is less than the small diameter of the double dovetail taper platform, or when the small diameter of the double dovetail taper groove is equal to the small diameter of the double dovetail taper platform but the plug and spring are not fully engaged, the double dovetail taper groove and the double dovetail taper platform are in contact with two edges, i.e., each spring and plug are in two line contacts), the contact area between the spring and the plug is increased. Especially with the double dovetail taper wedge structure, the contact points between the spring and the plug increase exponentially, increasing the number of contact points by four times compared to existing mechanical structures. Figure 10 The contact points are A1-A8, which greatly reduces the deformation between the spring and the plug when the plug is subjected to tensile or shear forces compared to existing mechanical joints. This reduces the amount of movement of the plug rod along the axial direction caused by the deformation of the plug when subjected to tensile or shear forces, and further improves the pull-out and shear resistance of the precast concrete pile.

[0057] Furthermore, such as Figure 11As shown, it also includes a spring 3, which is located at the end of the connector 2 where the spring piece 21 is located. When the plug 11 is inserted into the connector 2, the end of the spring 3 facing the connector 2 is fitted onto the outer wall of the spring piece 21. Since the end of the spring 3 facing the connector is fitted onto the outer wall of the spring piece 21 after the plug 11 is inserted into the connector 2, the plug and the spring piece are subjected to a ring force formed by the elastic deformation of the spring piece in the radial direction of the plug and a ring force formed by the end of the spring 3 fitted onto the outer wall of the spring piece. Therefore, when the plug is subjected to a pull-out force or a shear force, the spring piece is less likely to undergo secondary deformation, thereby increasing the ring force between the plug and the spring piece. This reduces or even eliminates the axial free distance between the plug and the connector when the plug is subjected to a pull-out force, thereby improving the pull-out and shear resistance of the plug and the connector, and thus improving the pull-out and shear resistance of the concrete pile connection.

[0058] Furthermore, such as Figure 11 As shown, the end of the spring 3 facing the connector 2 includes at least two tightly fitted spring coils 30, and the end of the spring 3 is tangent to the outer wall of the spring piece 21. Preferably, the spring piece 21 includes a radially curved arc portion 26 located on the inner side of the spring piece 21 and a tapered portion 27 located on the outer side of the spring piece 21. That is, the diameter of the outer wall surface of the spring piece 21 is smaller than the outer wall surface of the connector body, so that after the connector is installed at the end of the precast concrete pile, the spring piece has a certain bending space, which facilitates the spring piece to open outward when the insertion rod is inserted into the connector. At the same time, the end of the spring facing the connector 2 includes at least two tightly fitted spring coils, so that at least two spring wires wrap around the outer side of the spring piece, further increasing the clamping force on the spring piece, ensuring that the spring piece cannot open again after the plug is inserted into the spring piece, further improving the connection capacity of the mechanical joint, thereby improving the pull-out resistance and shear resistance of the pile connection.

[0059] Furthermore, such as Figure 12 As shown, it also includes a baffle 4. Before the plug 11 is inserted into the connector 2, the baffle 4 is provided at the end of the spring 21 to compress the spring 3 to prevent the end of the spring 3 facing the connector 2 from being sleeved on the outer wall of the spring 21.

[0060] When the plug 11 is inserted into the connector 2, the baffle 4 breaks or deforms under the thrust of the plug 11, thereby releasing the compression on the spring 3. The spring 3 recovers its deformation, causing one end of the spring 3 facing the connector 2 to fit onto the outer wall of the spring piece 21. In this embodiment, as... Figure 13 and Figure 14As shown, the baffle 4 includes a baffle body 40 and a plurality of baffle arms 41 circumferentially arranged on the baffle body 40. Preferably, the baffle is made of plastic or rubber, the diameter of the baffle body 40 is smaller than the inner diameter of the spring 3, and a plurality of baffle arms 41 are provided on the outer periphery of the baffle body. The number of baffle arms 41 is greater than or equal to three, so that when the plug is inserted into the connector, the thrust generated by the end of the plug abutting against the end of the baffle body causes the baffle arm to bend or break, thereby releasing the baffle from obstructing the spring, the compressed spring recovers its deformation, and then the end of the spring is sleeved on the outer wall of the spring piece.

[0061] Furthermore, the length of each dovetail taper cladding in the double dovetail taper cladding and the length of each dovetail taper slot in the double dovetail taper cladding are ( Figure 3 The length of H in the middle section is greater than or equal to 7mm. The lengths of the dovetail taper clamp and the dovetail taper groove are both greater than or equal to 7mm. This ensures that even if there is a certain inclination at the end face of the concrete pile or a certain verticality error during concrete pile driving, there will be a certain axial free distance between the plug insertion springs. This axial free distance is still less than the length of the dovetail taper clamp, thus ensuring that the plug and the connector can still be effectively clamped together, thereby ensuring the reliability of the precast concrete pile connection.

[0062] Furthermore, such as Figure 2 , Figure 3 and Figure 5 As shown, the plug connection 12 is a conical cylindrical structure, and the connector 2 has a conical receiving cavity 23. The taper of the conical receiving cavity 23 is consistent with the taper of the conical cylindrical structure, so that when the plug is inserted into the connector, the plug connection part and the conical receiving cavity can fit together, thereby eliminating the gap between the connector and the plug, improving the shear resistance of the mechanical joint, and thus improving the shear resistance of the connection between precast concrete piles. At the same time, the plug connection part and the conical receiving cavity can correct the plug and ensure effective engagement between the plug and the spring.

[0063] Furthermore, such as Figure 3 As shown, the end of the plug 11 is also provided with a guide surface 14; the plug rod fixing seat 10 is provided with a clamping structure 15 for clamping when installing the plug rod 1. The end of the plug rod is provided with a guide surface so that the plug can be easily inserted into the spring clip and the wear between the plug and the spring clip can be reduced. The clamping structure on the plug rod fixing seat 10 can facilitate the use of clamping tools to clamp the plug rod for installation. In this embodiment, the clamping structure is a polygonal structure provided between the plug rod connecting part and the plug rod fixing seat.

[0064] Preferably, such as Figure 22As shown, the double dovetail tapered groove is also provided with one or more teeth 28. Since the double dovetail tapered groove is provided with teeth, the teeth can be locked on the double dovetail tapered mounting platform, further improving the pull-out resistance of the pile connection.

[0065] Example 2

[0066] like Figure 15 and Figure 16 The illustration shows a first embodiment of a precast concrete pile with the mechanical joint disclosed in this invention. It includes a precast concrete pile body 6 and the mechanical joint described in this invention. Both ends of the precast concrete pile body 6 are provided with end plates 60, which are connected to the main reinforcement bars within the precast concrete pile body 6. A rod 1 is fixedly installed on the end plate at one end of the precast concrete pile body 6, and a connector 2 is fixedly installed on the end plate at the other end of the precast concrete pile body 6. In this embodiment, multiple threaded mounting holes 61 are evenly distributed on the end plate 6. The rod fixing part 10 is provided with external threads, and the outer diameter of the connector body 20 is also provided with external threads. The rod and connector are respectively threaded onto the end plates at both ends. The connection is achieved by providing a connector receiving space 62 at one end of the precast concrete pile body 6 equipped with a connector. After the connector is installed on the end plate, the spring piece 21 of the connector is placed in the connector receiving space 62. The spring piece 21 can open radially within the connector receiving space 62. The spring 3 and the baffle 4 are also placed in the connector receiving space 62. One end of the spring 3 abuts against the bottom of the connector receiving space 62. Before the plug is inserted into the connector, the baffle 4 is placed between the ends of the spring 3 and the spring piece 21. When the two precast concrete piles are connected, the plug is inserted into the connector. The plug causes the baffle to break or deform, and then the spring recovers its deformation to fit on the outer wall of the spring piece, thus realizing the connection of the two precast concrete piles. Preferably, the outer diameter of the spring contacts the inner wall of the connector receiving space, or there is only a small gap between the outer diameter of the spring and the inner wall of the connector receiving space, so that the spring piece of the connector cannot open again under the action of the spring piece's restoring force, the spring's circumferential force, and the spatial restriction of the inner wall of the connector receiving space, thereby improving the pull-out resistance and shear resistance of the pile connection.

[0067] Example 3

[0068] like Figure 17 , Figure 18 and Figure 19 As shown, the mechanical connector disclosed in this invention also includes a sleeve 5, the connector 2 is installed in the sleeve 2, and the spring 3 is placed inside the sleeve 5. When the plug 11 is inserted into the connector 2 and one end of the spring 3 facing the connector 2 is fitted onto the outer wall of the spring piece 21, the end coil of the spring 3 enters the gap between the spring piece 21 and the inner wall of the sleeve 5.

[0069] Specifically, such as Figure 20 and Figure 21 The image shows a second embodiment of a precast concrete pile with the mechanical joint disclosed in this invention, comprising a precast concrete pile body 6 and the mechanical joint disclosed in this invention. The precast concrete pile body 6 has a first nut sleeve 63 and a second nut sleeve 64 at both ends. One end of the first nut sleeve 63 and the second nut sleeve 64 is a main reinforcement fixing end for connection with the main reinforcement 65 inside the precast concrete pile body. Both ends of the main reinforcement 65 inside the precast concrete pile body 6 are connected to the main reinforcement fixing ends of the first nut sleeve 63 and the second nut sleeve 64, respectively. The other end of the first nut sleeve 63 is a rod fixing end, and the other end of the second nut sleeve 64 is a connector fixing end. Both the rod fixing end and the connector fixing end are provided with inner... The precast concrete pile body 6 has threads to facilitate threaded connection with the insertion rod fixing part and the connector body. The insertion rod 1 is installed at one end of the first nut sleeve 63, and the connector 2 is installed at one end of the second nut sleeve 64. The second nut sleeve 64 also has a baffle 4 and a spring 3. Before the plug 11 is inserted into the connector 2, the baffle 4 is set between the end of the spring piece 21 and the spring 3. When the plug 11 is inserted into the connector 2 and the end of the spring 3 facing the connector 2 is sleeved on the outer wall of the spring piece 21, the end of the spring 3 enters the gap between the spring piece 21 and the inner wall of the sleeve 5. The mechanical joint disclosed in this invention realizes the rapid connection between two adjacent precast concrete piles. Preferably, the outer diameter of the spring contacts the inner wall of the second nut sleeve, or there is only a small gap between the outer diameter of the spring and the inner wall of the second nut sleeve. This prevents the spring piece of the connector from opening again under the restoring force of the spring piece, the circumferential force of the spring, and the spatial constraint of the inner wall of the second nut sleeve, thereby improving the pull-out resistance and shear resistance of the pile connection.

[0070] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mechanical joint, characterized in that: Includes a plug (1) and a connector (2); The insertion rod (1) includes an insertion rod fixing seat (10) with external threads, a plug (11) with a double dovetail taper chuck (13) and a plug connection part (12) for connecting the insertion rod fixing seat (10) and the plug (11). The tapered jaw surface of the dovetail tapered jaw gradually increases in size from the end near the plug connection part toward the end of the plug; The connector (2) includes a connector body (20) with a sleeve structure and a plurality of spring pieces (21) disposed at one end of the connector body (20) and arranged circumferentially along the connector body (20). The inner wall of the spring piece (21) is provided with a double dovetail taper groove (22). The tapered groove surface of the dovetail taper groove gradually increases in size from the end where the plug is inserted toward the end of the spring piece; The length of the dovetail taper chuck is greater than the axial free distance between the plug insertion springs; When the spring tab of the connector is in a free state, the small diameter end diameter of the double dovetail taper groove is less than or equal to the small diameter end diameter of the double dovetail taper table. When the plug (11) is inserted into the connector (2), the plurality of spring pieces (21) can open along the radial direction of the connector (2) so that the double dovetail taper slot (22) is engaged on the double dovetail taper table (13); When the double dovetail taper slot is engaged with the double dovetail taper plate, at least the two sides of the slot in the axial direction of the double dovetail taper slot are engaged with the tapered plate surface of the double dovetail taper plate along the axial direction of the insertion rod.

2. The mechanical joint according to claim 1, characterized in that: It also includes a spring (3), which is located at one end of the connector (2) where the spring piece (21) is located. When the plug (11) is inserted into the connector (2), the end of the spring (3) facing the connector (2) is fitted onto the outer wall of the spring piece (21).

3. The mechanical joint according to claim 2, characterized in that: The spring (3) has at least two tightly fitted spring coils (30) at one end facing the connector (2), and the end of the spring (3) is tangent to the outer wall of the spring piece (21).

4. The mechanical joint according to claim 3, characterized in that: It also includes a baffle (4), which is provided at the end of the spring (21) before the plug (11) is inserted into the connector (2) to compress the spring (3) and prevent the spring (3) from being sleeved on the outer wall of the spring (21) at one end toward the connector (2); When the plug (11) is inserted into the connector (2), the baffle (4) breaks or deforms under the thrust of the plug (11), thereby releasing the compression of the spring (3). The spring (3) recovers its deformation, thereby causing one end of the spring (3) to be fitted onto the outer wall of the spring piece (21) towards the connector (2).

5. The mechanical joint according to any one of claims 2 to 4, characterized in that: The length of each dovetail taper plate in the double dovetail taper plate (13) and each dovetail taper groove in the double dovetail taper groove (22) is greater than or equal to 7 mm.

6. The mechanical joint according to claim 5, characterized in that: The double dovetail tapered groove is also provided with teeth (28).

7. The mechanical joint according to claim 6, characterized in that: The plug connector (12) is a conical column structure. The connector (2) is provided with a conical cavity (23). The taper of the conical cavity (23) is consistent with the taper of the conical column structure. The end of the plug (11) is also provided with a guide surface (14). The plug rod fixing seat (10) is provided with a clamping structure (15) for clamping when installing the plug rod (1).

8. The mechanical joint according to claim 7, characterized in that: It also includes a sleeve (5), the connector (2) is installed in the sleeve (5), and the spring (3) is placed inside the sleeve (5).

9. The mechanical joint according to claim 8, characterized in that: When the plug (11) is inserted into the connector (2) and one end of the spring (3) facing the connector (2) is fitted onto the outer wall of the spring piece (21), the end of the spring (3) enters the gap between the spring piece (21) and the inner wall of the sleeve (5).

10. A precast concrete pile, characterized in that: It includes a precast concrete pile body (6) and a mechanical joint as described in any one of claims 1-9, the mechanical joint being installed at the end of the precast concrete pile body (6).

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