Elastic clamping connecting piece, mechanical connector and precast pile connecting structure

Abstract

The invention discloses an elastic clamping connecting piece, a mechanical connector and a precast pile connecting structure, the elastic clamping connecting piece comprises a connecting piece body and a plurality of elastic pieces arranged at one end of the connecting piece body and arranged in the circumferential direction of the connecting piece body, and the inner wall face of each elastic piece is provided with a first elastic piece clamping face with taper; a certain angle is formed between the line of the two side edges of the first elastic piece clamping face and the generatrix of the first elastic piece clamping face, so that a second elastic piece clamping face is formed in the inner wall face of the elastic piece. According to the elastic clamping connecting piece, the clamping area of the elastic clamping connecting piece and the plug is increased, meanwhile, the direction of the acting force of the two side edges of the clamping face of the elastic piece and the plug clamping face of the plug is changed, then the clamping performance of the inserting rod and the elastic clamping connecting piece is improved, and therefore the anti-pulling performance of precast pile connection is improved.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated pile connection, in particular to a spring-clip connector, a mechanical joint and a prefabricated pile connection structure. Background Art

[0002] In construction, precast pile docking is an indispensable process. In order to achieve rapid connection of precast piles, mechanical joints are generally set at both ends of the precast piles. The mechanical structure is used to clamp the precast piles to achieve rapid connection and obtain better connection performance.

[0003] In the use of mechanical joints for prefabricated pile connections, the spring-clip mechanical joint is a commonly used structure, such as Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, the spring-cage mechanical joint includes an insertion rod 2 and a spring-cage connector 1, the insertion rod includes an insertion rod seat and a plug arranged on the insertion rod seat, the plug is provided with a tapered plug fixing surface, the spring-cage connector includes a connector body and a plurality of spring sheets arranged at one end of the connector body and arranged circumferentially, the inner wall surface of the spring sheet is provided with a tapered first spring sheet fixing surface, the plug can be plugged into the spring-cage connector to thereby realize the clamping connection between the first spring sheet fixing surface and the plug fixing surface, thereby realizing the clamping connection between the plug and the spring-cage connector.

[0004] However, the spring-cage mechanical joint of this structure still has the following problems: Specifically, as shown in FIG. 12 , the spring-cage mechanical joint of this structure requires the radial rebound of the spring sheet to clamp the plug to realize the clamping connection between the plug and the spring-cage connector. Therefore, before the plug is inserted into the spring-cage connector, the inner diameter of the clamp cavity formed by the spring sheet needs to be less than or equal to the outer diameter of the clamping surface of the plug. Fig.12 As shown, there is generally line contact between the spring clamping surface and the plug clamping surface (the two side edge lines of the spring clamping surface are clamped with the plug clamping surface, A1-A8 in the figure), which not only makes the clamping part easy to be damaged, but also, when the mechanical joint is subjected to a pulling force, since the pulling force is in the same direction as the force at the clamping part, it is easy to cause axial slippage between the plug and the spring clamping connector, affecting the connection performance between the prefabricated piles. Summary of the invention

[0005] In view of the above problems, the present invention provides a spring-clip connector.

[0006] The technical means adopted by the present invention are as follows:

[0007] A spring-clip connector comprises a connector body and a plurality of spring sheets arranged at one end of the connector body and circumferentially arranged along the connector body, wherein the inner wall surface of the spring sheet is provided with a tapered first spring sheet clamping surface, and the side edge lines of the first spring sheet clamping surface form a certain angle with the generatrix of the first spring sheet clamping surface, so that a second spring sheet clamping surface is formed inside the inner wall surface of the spring sheet.

[0008] Furthermore, the angles between the side edge lines of the first spring piece fixing surface and the generatrix of the first fixing surface are 20°-40°.

[0009] Furthermore, the inner wall surface of the spring sheet is provided with a layer of first spring sheet fixing surface to form a single-cone spring-locking connector; or the inner wall surface of the spring sheet is provided with two layers of first spring sheet fixing surfaces to form a double-cone spring-locking connector; or the inner wall surface of the spring sheet is provided with multiple layers of first spring sheet fixing surfaces to form a multi-cone spring-locking connector.

[0010] Furthermore, when the spring-cage connector is a double-cone spring-cage connector or a multi-cone spring-cage connector, the edge lines of the first spring sheet fixing surfaces of different layers are parallel.

[0011] Furthermore, when the spring-cage connector is a double-cone spring-cage connector or a multi-cone spring-cage connector, the edge lines of the first spring sheet fixing surfaces at different layers form a certain angle.

[0012] Furthermore, the included angle of the projection of the adjacent side edge lines of the first spring-piece fixing surfaces of two adjacent spring pieces on the plane where the end surface of the spring-clamp connector is located is 60°-120°.

[0013] A mechanical joint, comprising an insertion rod and the spring-clip connector described in the present application;

[0014] The plug rod includes a plug rod seat and a plug arranged on the plug rod seat, and the plug is provided with a plug fixing surface for fixing with a spring clip fixing surface. The plug can be inserted into the spring clip connector to achieve the fixing of the plug and the spring clip connector, and the edge line of the first spring clip fixing surface is fixed at a certain angle to the busbar of the plug fixing surface.

[0015] Furthermore, it also includes a retaining spring and a blocking plate, wherein the retaining spring is used to clamp on the outer wall of the spring sheet after the plug is inserted into the spring-clip connector to limit the radial expansion of the spring sheet; the blocking plate is used to compress the retaining spring before the plug is inserted into the spring-clip connector, and to release the compression of the retaining spring during the process of inserting the plug into the spring-clip connector, so that the retaining spring rebounds and clamps on the outer wall of the spring sheet to limit the radial expansion of the spring sheet.

[0016] A prefabricated pile connection structure, comprising a first end plate and a second end plate arranged at both ends of the prefabricated pile, and also comprising the mechanical joint described in the present application, wherein the plunger is connected to the first end plate, and the spring-clip connector is connected to the second end plate; or,

[0017] It includes a first nut sleeve and a second nut sleeve arranged at both ends of the main reinforcement of the precast pile, and also includes the mechanical joint described in the present application, the insertion rod is connected to the first nut sleeve, and the spring-clip connector is connected to the second nut sleeve.

[0018] Furthermore, the prefabricated pile is provided with a second end plate at one end thereof and is also provided with the retaining spring and the blocking plate; or, the second nut sleeve is also provided with the retaining spring and the blocking plate.

[0019] Compared with the prior art, the spring-clip connector disclosed in the present invention has the following beneficial effects: the spring-clip connector disclosed in the present application forms a second spring-clip fixing surface on the inner wall of the spring sheet by setting the side edge lines of the first spring sheet fixing surface on the inner wall of the spring sheet to form a certain angle with the generatrix of the first spring sheet fixing surface, thereby increasing the fixing area between the spring-clip connector and the plug, and changing the direction of the force between the side edges of the spring sheet fixing surface and the plug fixing surface of the plug, thereby improving the fixing performance between the plug rod and the spring-clip connector, thereby improving the pull-out resistance of the prefabricated pile connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the spring-cage connector disclosed in the present invention, and the figure shows a double-cone spring-cage connector;

[0021] Figure 2 It is a structural diagram of the insertion rod in the present invention;

[0022] Figure 3 It is a right side view of the bullet card connecting piece of the present invention;

[0023] Figure 4 It is a structural diagram of the mechanical joint disclosed in the present invention;

[0024] Figure 5 It is a structural diagram of a mechanical joint with a clip and a baffle disclosed in the present invention;

[0025] Figure 6 It is a schematic diagram of the clamping spring on the outer wall of the shrapnel;

[0026] Figure 7 This is a structural diagram of the first prefabricated pile connection structure disclosed in the present invention;

[0027] Figure 8 It is a structural diagram of the second prefabricated pile connection structure disclosed in the present invention;

[0028] Fig. 9It is a structural diagram of an existing spring-clip type mechanical joint;

[0029] Fig.10 It is a structural diagram of a spring-clip connector of an existing spring-clip type mechanical joint;

[0030] Fig.11 for Fig.10 Right view of;

[0031] Fig.12 for Fig. 9 Sectional view at CC;

[0032] Fig.13 It is a schematic diagram of the force acting on the plug when the existing spring-clip mechanical connector is subjected to a pulling force.

[0033] In the figure: 1, spring-cage connector; 10, connector body; 11, spring; 12, first spring clamping surface; 13, edge line of first spring clamping surface; 14, second spring clamping surface; 15, busbar of first spring clamping surface; 2, plug; 20, plug seat; 21, plug; 22, plug clamping surface; 23, busbar of plug clamping surface; 3, retaining spring; 4, baffle; 41, baffle body; 42, baffle arm; 50, first end plate; 51, second end plate; 52, accommodating hole; 60, first sleeve; 61, second sleeve; 7, precast pile; 8, precast pile main reinforcement. DETAILED DESCRIPTION

[0034] like Figure 1 As shown, a spring-cage connector 1 disclosed in the present invention comprises a connector body 10 and a plurality of spring pieces 11 arranged at one end of the connector body 10 and arranged circumferentially along the connector body 10, the inner wall surface of the spring piece 11 is provided with a tapered first spring piece fixing surface 12, and the side edge lines 13 of the first spring piece fixing surface 12 form a certain angle with the generatrix 15 of the first spring piece fixing surface, so that a second spring piece fixing surface 14 is formed inside the inner wall surface of the spring piece 11.

[0035] Specifically, the spring-clip connector 1 is an integral structure, one end of the spring-clip connector 1 is a connector body 10 of a sleeve structure, and the other end is processed with multiple openings from the end to one side of the connector body to form a spring sheet, and the outer diameter of the spring sheet 11 gradually decreases from one end connected to the connector body 10 to the other end (free end), and the inner wall surface of the spring sheet 11 is provided with a first spring sheet fixing surface 12 with a certain taper. In the present application, the side edge lines 13 of the first spring sheet fixing surface 12 are processed to form a certain angle with the generatrix of the first spring sheet fixing surface, so that a second spring sheet fixing surface 14 is formed in the inner wall surface of the spring sheet 11, as shown in FIG. Figure 1As shown, when the spring-cage connector 1 disclosed in the present application is connected with the plug 21 of the plug rod 2, the side edge lines 13 of the first spring clip fixing surface 12 are processed to form a certain angle with the busbar of the first spring clip fixing surface, so that the second spring clip fixing surface 14 is formed in the inner wall surface of the spring clip 11, thereby increasing the contact area between the spring clip fixing surface and the plug fixing surface 22 of the plug 21. At the same time, the edge line 13 of the first spring clip fixing surface 12 and the card line 23 of the plug fixing surface 22 form a certain angle with the busbar 23 of the plug fixing surface, which changes the direction of the force between the edge line 13 of the first spring clip fixing surface 12 and the plug fixing surface 22, as shown in FIG. Fig.13 As shown in the figure, when the existing spring-cage connector is connected to the plug rod and subjected to a pulling force, the direction of the force between the edge line 13 of the first spring-cage fixing surface 12 and the plug fixing surface 22 is consistent (F1 / F2 are both along the axial direction of the plug rod), and the dotted line A in the figure represents the action line between the existing first spring-cage fixing surface and the plug fixing surface, which makes it easy for the plug and the spring to slip axially, and the edge line of the first spring-cage fixing surface is easily damaged, thereby reducing the clamping performance between the plug and the spring; Figure 2 As shown, after the spring-clip connector of the present application is connected to the plug rod and is subjected to a pulling force, the direction of the force between the edge line 13 of the first spring clip fixing surface 12 and the plug fixing surface 22 forms a certain angle (the pulling force is along the axial direction of the plug rod, and the force between the edge line 13 of the first spring clip fixing surface 12 and the plug fixing surface 22 is along the edge line). The dotted line B in the figure shows the action line of the first spring clip fixing surface and the plug fixing surface of the present application, which makes it difficult for axial slippage to occur between the plug and the spring clip, and the edge line of the first spring clip fixing surface is not easily damaged, thereby significantly improving the clamping performance between the plug and the spring clip, thereby improving the pull-out resistance of the prefabricated pile connection. At the same time, in the present application, the edge line 13 of the first spring clip fixing surface 12 and the fixing line of the plug fixing surface 22 and the busbar 23 of the plug fixing surface form a certain angle, and the length of the edge line 13 of the first spring clip fixing surface is increased, thereby increasing the effective length of the edge line of the first fixing surface and the plug fixing surface, thereby further improving the fixing performance between the plug rod and the spring-clip connector.

[0036] Furthermore, if Figure 1 As shown, the angle a between the two side edge lines 13 of the first spring sheet fixing surface 12 and the generatrix 15 of the first fixing surface is 20°-40°, so that better clamping performance can be obtained between the insertion rod and the spring clamp connector.

[0037] like Figure 1 and Figure 2As shown, in the present application, the inner wall surface of the spring sheet 11 is provided with two layers of first spring sheet fixing surfaces 12 to form a double-cone spring-cage connector, and correspondingly, the plug 21 is provided with two layers of plug fixing surfaces to form a double-cone plug, so that the contact area between the plug and the spring-cage connector is larger, thereby increasing the clamping performance; in the present application, the inner wall surface of the spring sheet 11 can also be provided with a layer of first spring sheet fixing surface 12 to form a single-cone spring-cage connector, and correspondingly, the plug 21 is provided with a layer of plug fixing surface to form a single-cone plug, so as to facilitate processing and clamping; in the present application, the inner wall surface of the spring sheet 11 can also be provided with multiple layers of first spring sheet fixing surfaces 12 to form a multi-cone spring-cage connector, and correspondingly, the plug 21 is provided with multiple layers of plug fixing surfaces to form a multi-cone plug, so as to further increase the contact area between the plug and the spring-cage connector, thereby increasing the clamping performance.

[0038] Furthermore, when the spring-cage connector 1 is a double-cone spring-cage connector or a multi-cone spring-cage connector, the edge lines 13 of the first spring sheet fixing surfaces of different layers are parallel.

[0039] Specifically, in the present application, the two side edge lines 13 of the first spring clip fixing surface 12 and the generatrix 15 of the first spring clip fixing surface are at a certain angle, which can be formed by punching and wire cutting and other processing methods, that is, by punching or wire cutting and other methods to process a square or other shaped hole in the circular hole of the spring clip connector, so that the two side edge lines 13 of the first spring clip fixing surface 12 and the generatrix 15 of the first spring clip fixing surface are at a certain angle. In this embodiment, when the spring clip connector 1 is a double-cone spring clip connector or a multi-cone spring clip connector, the edge lines 13 of the first spring clip fixing surfaces of different layers are parallel, which can facilitate processing.

[0040] Furthermore, when the spring-cage connector 1 is a double-cone spring-cage connector or a multi-cone spring-cage connector, the edge lines 13 of the first spring sheet fixing surfaces at different layers form a certain angle.

[0041] Specifically, in this embodiment, when the spring-cage connector 1 is a double-cone spring-cage connector or a multi-cone spring-cage connector, the edge lines 13 of the first spring clip fixing surfaces of different layers form a certain angle, that is, the angles formed by the edge lines 13 of the first spring clip fixing surfaces of different layers and the busbars of the first spring clip fixing surfaces are different. Therefore, when a pulling force is applied between the plug rod and the spring-cage connector, the directions of the force applied to the edge lines of the first spring clip fixing surfaces of different layers and the plug are different, thereby further increasing the clamping performance between the plug and the spring clip.

[0042] Furthermore, if Figure 3 As shown, the included angle b of the projection of the adjacent side edge line 13 of the first spring sheet fixing surface 12 of two adjacent spring sheets 11 on the plane where the end surface of the spring card connector 1 is located is 60°-120°, so that better clamping performance can be obtained between the spring card connector and the plug.

[0043] like Figure 4 The figure shows the mechanical joint disclosed in the present invention, including an insertion rod 2 and a spring-clip connector 1 described in the present application;

[0044] The plug rod 2 includes a plug rod seat 20 and a plug 21 arranged on the plug rod seat 20, and the plug 21 is provided with a plug fixing surface 22 for fixing with a spring clip fixing surface. The plug 21 can be inserted into the spring card connector 1 to realize the fixing of the plug 21 with the spring card connector 1, and the edge line 13 of the first spring clip fixing surface 12 is fixed at a certain angle to the busbar 23 of the plug fixing surface. In the mechanical joint disclosed in the present invention, the spring card connector forms a second spring clip fixing surface on the inner wall of the spring clip by setting the two side edge lines of the first spring clip fixing surface on the inner wall of the spring clip to form a certain angle with the busbar of the first spring clip fixing surface, so that the inner wall surface of the spring clip forms a second spring clip fixing surface, which not only increases the fixing area between the spring card connector and the plug, but also changes the direction of the acting force between the two side edges of the spring clip fixing surface and the plug fixing surface of the plug, thereby improving the fixing performance of the plug rod and the spring card connector, thereby improving the pull-out resistance of the prefabricated pile connection.

[0045] Furthermore, a clamping spring 3 is included, and the clamping spring 3 is used to clamp on the outer wall of the spring sheet 11 after the plug 21 is inserted into the spring-clip connector 1 to limit the radial expansion of the spring sheet 11.

[0046] Specifically, Figure 5 and Figure 6 As shown, before the plug is inserted into the spring-cage connector, the retaining spring 3 is arranged on one side of the free end of the spring sheet (at this time, the retaining spring is not clamped on the outer wall of the spring sheet). During the process of inserting the plug into the spring-cage connector, the spring sheet opens radially under the action of the plug and realizes the clamping connection between the spring sheet and the plug. After the spring sheet and the plug are clamped, the retaining spring 3 is clamped on the outer wall of the spring sheet, and the clamping force of the retaining spring can prevent the spring sheet from opening radially again, thereby improving the connection performance.

[0047] Furthermore, it also includes a baffle 4, which is used to compress the retaining spring 3 before the plug 21 is inserted into the spring-clip connector 1, and to release the compression of the retaining spring 3 during the insertion of the plug 21 into the spring-clip connector 1, so that the retaining spring 3 rebounds and clamps on the outer wall of the spring sheet 11 to limit the radial opening of the spring sheet 11.

[0048] Specifically, before the plug is inserted into the spring card connector, a baffle 4 is further arranged between the free end of the spring and the spring clip. The baffle 4 can ensure that the spring clip is in a compressed state before the plug is inserted into the spring card connector, and release the compression of the spring clip 3 during the process of inserting the plug into the spring card connector, so that after the plug is inserted into the spring card connector, the spring clip can rebound and clamp on the outer wall of the spring. In this embodiment, the baffle 4 includes a baffle body 41 and three or more baffle arms 42 arranged on the baffle body 41. During the plug-in process, in order to release the baffle 4 from stopping the spring 3, the baffle arms 42 can be bent or broken. Specifically, the circumscribed circle diameter of the baffle 4 is greater than the inner diameter of the spring, and preferably the circumscribed circle diameter of the baffle 4 is equal to the outer diameter of the spring. The material of the baffle 4 is plastic or rubber. In a preferred embodiment, the baffle 4 is made of rubber.

[0049] like Figure 7 The figure shows a first embodiment of the precast pile connection structure disclosed in the present invention, including a first end plate 50 and a second end plate 51 arranged at both ends of the precast pile, and also includes the mechanical joint described in the present application, the insertion rod 2 is connected to the first end plate 50, and the spring-clip connector 1 is connected to the second end plate 51.

[0050] Specifically, main reinforcement anchor holes and tensioning holes are provided on the first end plate and the second end plate, the first end plate and the second end plate are respectively arranged at the two ends of the precast pile and are respectively connected to the two ends of the main reinforcement of the precast pile in the precast pile through the main reinforcement anchor holes, the insertion rod seat of the insertion rod is provided with external threads, the insertion rod seat is connected to the tensioning hole on the first end plate, the outer wall of the connector body of the spring-clip connector is provided with external threads, the spring-clip connector is connected to the tensioning hole of the second end plate, and the precast pile body is provided with a second end plate at one end thereof and a receiving hole 52 at a position corresponding to the tensioning hole, after the spring-clip connector is connected to the second end plate, the spring sheet part of the spring-clip connector is placed in the receiving hole and can be radially opened in the receiving hole. Two adjacent sections of precast piles can be quickly connected by the mechanical joint disclosed in the present application, and have significant pull-out resistance.

[0051] Furthermore, the end of the prefabricated pile 7 provided with the second end plate 51 is also provided with the retaining spring 3 and the blocking piece 4.

[0052] Specifically, a retaining spring and a blocking piece are provided in the accommodating hole. Before the insertion rod is inserted into the spring-cage connector, the retaining spring is compressed by the blocking piece and the free ends of the spring-cage connector. During the process of the insertion rod being inserted into the spring-cage connector, the blocking piece is damaged by the impact force of the plug, thereby releasing the compression of the retaining spring, causing the retaining spring to rebound and clamp onto the outer wall of the spring piece, thereby limiting the radial opening of the spring piece again and improving the clamping performance between the plug and the spring-cage connector.

[0053] like Figure 8The figure shows another embodiment of the precast pile connection structure disclosed in the present application, including a first nut sleeve 60 and a second nut sleeve 61 arranged at both ends of the precast pile main reinforcement 8, and also includes the mechanical joint described in the present application, the insertion rod 2 is connected to the first nut sleeve 60, and the spring-clip connector 1 is connected to the second nut sleeve 61.

[0054] Specifically, one end of the first nut sleeve is the main reinforcement connection end, and the other end is the plug rod connection end. One end of the second nut sleeve is the main reinforcement connection end, and the other end is the spring-clip connection end. The first nut sleeve and the second nut sleeve are respectively arranged at both ends of the prefabricated pile and connected to the main reinforcement 8 of the prefabricated pile. The plug rod connection end of the first nut sleeve is connected to the plug rod, and the spring-clip connection end of the second nut sleeve is connected to the spring-clip connector. The spring sheet of the spring-clip connector is placed in the second nut sleeve and can be radially opened. Two adjacent sections of prefabricated piles can be quickly connected through the mechanical joint disclosed in the present application, and it has significant pull-out resistance.

[0055] Furthermore, the second nut sleeve 61 is further provided with the retaining spring 3 and the blocking piece 4 .

[0056] Specifically, a retaining spring and a blocking piece are also provided in the second nut sleeve. Before the insertion rod is inserted into the spring-clip connector, the retaining spring is compressed by the blocking piece and the free end of the spring-clip connector. During the process of the insertion rod being inserted into the spring-clip connector, the blocking piece is damaged by the impact force of the plug, thereby releasing the compression of the retaining spring, causing the retaining spring to rebound and clamp onto the outer wall of the spring piece, thereby limiting the radial opening of the spring piece again and improving the clamping performance between the plug and the spring-clip connector.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A spring-cage connector, comprising a connector body (10) and a plurality of spring pieces (11) disposed at one end of the connector body (10) and arranged circumferentially along the connector body (10), wherein the inner wall surface of the spring piece (11) is provided with a tapered first spring piece fixing surface (12), characterized in that: The side edge lines (13) of the first spring piece fixing surface (12) form a certain angle with the generatrix (15) of the first spring piece fixing surface, so that a second spring piece fixing surface (14) is formed inside the inner wall surface of the spring piece (11).

2. The spring-clip connector according to claim 1, characterized in that: The angle between the side edge lines (13) of the first spring piece fixing surface (12) and the generatrix (15) of the first fixing surface is 20°-40°.

3. The spring-cage connector according to claim 1 or 2, characterized in that: The inner wall surface of the spring sheet (11) is provided with a layer of first spring sheet fixing surface (12) to form a single-cone spring-locking connector; or the inner wall surface of the spring sheet (11) is provided with two layers of first spring sheet fixing surface (12) to form a double-cone spring-locking connector; or the inner wall surface of the spring sheet (11) is provided with multiple layers of first spring sheet fixing surface (12) to form a multi-cone spring-locking connector.

4. The spring-clip connector according to claim 3, characterized in that: When the spring-cage connector (1) is a double-cone spring-cage connector or a multi-cone spring-cage connector, the edge lines (13) of the first spring-cage fixing surfaces (12) at different layers are parallel; when the spring-cage connector (1) is a double-cone spring-cage connector or a multi-cone spring-cage connector, the edge lines (13) of the first spring-cage fixing surfaces (12) at different layers form a certain angle.

5. The spring-clip connector according to claim 1, characterized in that: The included angle of the projection of the adjacent side edge lines (13) of the first spring-piece clamping surfaces (12) of two adjacent spring pieces (11) on the plane where the end surface of the spring-clamp connector (1) is located is 60°-120°.

6. A mechanical joint, characterized in that: It comprises an insertion rod (2) and the snap-on connector (1) according to any one of claims 1 to 5; The plug rod (2) comprises a plug rod seat (20) and a plug (21) arranged on the plug rod seat (20); the plug (21) is provided with a plug clamping surface (22) for clamping with a spring clamping surface; the plug (21) can be inserted into the spring clamping connector (1) to realize clamping of the plug (21) with the spring clamping connector (1); and the edge line (13) of the first spring clamping surface (12) is clamped with the busbar (23) of the plug clamping surface at a certain angle.

7. The mechanical joint according to claim 6, characterized in that: It also includes a clamping spring (3) and a blocking piece (4), wherein the clamping spring (3) is used to clamp onto the outer wall of the spring sheet (11) after the plug (21) is inserted into the spring-clamp connector (1) to limit the radial expansion of the spring sheet (11); The blocking piece (4) is used to put the retaining spring (3) in a compressed state before the plug (21) is inserted into the spring-clip connector (1), and to release the compression of the retaining spring (3) during the process of inserting the plug (21) into the spring-clip connector (1), so that the retaining spring (3) rebounds and clamps on the outer wall of the spring sheet (11) to limit the radial expansion of the spring sheet (11).

8. A prefabricated pile connection structure, characterized in that: It comprises a first end plate (50) and a second end plate (51) arranged at both ends of the precast pile, and also comprises the mechanical joint according to claim 6 or 7, the plug rod (2) is connected to the first end plate (50), and the spring-clip connector (1) is connected to the second end plate (51); or, It comprises a first nut sleeve (60) and a second nut sleeve (61) arranged at both ends of the main reinforcement (8) of the precast pile, and also comprises the mechanical joint described in claim 6 or 7, the inserted rod (2) is connected to the first nut sleeve (60), and the spring-clip connector (1) is connected to the second nut sleeve (61).

9. The prefabricated pile connection structure according to claim 8, characterized in that: The end of the prefabricated pile provided with the second end plate (51) is also provided with the retaining spring (3) and the blocking plate (4); or, The second nut sleeve (61) is also provided with the retaining spring (3) and the blocking sheet (4).

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