Mechanical connector for connecting prefabricated parts and prefabricated pile connecting structure

Abstract

The utility model discloses a mechanical joint for prefabricated part connection and a prefabricated pile connection structure. The mechanical joint comprises a positioning insertion rod, a spring clamping nut and a clamping spring. The positioning insertion rod comprises a positioning insertion rod seat and an insertion head, the insertion head is provided with first clamping teeth, and the first clamping teeth are provided with first clamping surfaces; a clamping spring containing groove is formed in the spring clamping nut, and a second clamping face is arranged in the clamping spring containing groove. The clamping spring is arranged in the clamping spring accommodating groove; the plug can be inserted into the spring clamping nut, and clamping of the positioning insertion rod and the spring clamping nut is achieved through the first clamping face, the second clamping face and the clamping spring. According to the mechanical connector for connecting the prefabricated parts, quick connection between concrete piles can be achieved through the structure, assembly type connection is achieved while an existing prefabricated pile manufacturing process is not changed, connection is reliable, and the comprehensive cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of precast pile connection, in particular to a mechanical joint for precast member connection and a precast pile connection structure. Background Art

[0002] In building construction, the butt joint of precast members is an essential process. Generally, there are two traditional ways to connect precast members. One way is to provide end plates at both ends of the precast members, and the connection of the precast members is realized by welding between the end plates. However, this way has problems such as complex construction process and affecting construction efficiency. Another way is to use a mechanical joint for connection, such as the mechanical connection structure disclosed on page 0092 of GB23G409 - Pretensioned Prestressed Concrete Pipe Piles. It needs to open holes and slots on the existing end plates, and the product needs to be customized, which will damage the end plates, resulting in complex structure and high comprehensive cost. Summary of the Utility Model

[0003] The utility model provides a mechanical joint for precast member connection to solve the above problems.

[0004] The technical means adopted by the utility model are as follows:

[0005] A mechanical joint for precast member connection includes: a positioning plug rod, a spring clamping nut, and a clamping spring;

[0006] The positioning plug rod includes a positioning plug rod seat and a plug provided on the positioning plug rod seat. The plug is provided with first locking teeth, and the first locking teeth are provided with a first clamping surface;

[0007] The spring clamping nut is internally provided with a clamping spring accommodating groove for accommodating the clamping spring, and the clamping spring accommodating groove is provided with a second clamping surface;

[0008] The clamping spring is arranged in the clamping spring accommodating groove; the plug can be inserted into the spring clamping nut. When the plug is inserted into the spring clamping nut, the clamping spring can expand radially in the clamping spring accommodating groove and then clamp on the first locking teeth, and the clamping of the positioning plug rod and the spring clamping nut is realized through the first clamping surface, the second clamping surface, and the clamping spring.

[0009] Furthermore, the first locking teeth are one or more circles of annular locking teeth provided on the plug; the clamping spring accommodating groove is one or more circles of annular grooves provided in the spring clamping nut; the clamping spring is an annular clamping spring.

[0010] Further, the first engaging teeth are spiral engaging teeth provided on the plug; the engaging spring receiving groove is a spiral groove provided in the spring engaging nut; the engaging spring is a spiral engaging spring.

[0011] Further, the cross-section of the engaging spring is triangular, circular or polygonal.

[0012] Further, when the cross-section of the engaging spring is circular, after the engaging spring is clamped in the first engaging teeth, the outer diameter corresponding to the tooth top of the first engaging teeth is greater than or equal to the diameter corresponding to the center of the cross-section of the engaging spring;

[0013] When the cross-section of the engaging spring is triangular, the ratio of the width of the first engaging teeth to the width of the cross-section of the engaging spring is less than or equal to 1 / 2, and the height of the first engaging teeth is the same as the height of the cross-section of the engaging spring; the ratio of the height of the first engaging teeth to the groove height of the engaging spring receiving groove is equal to 1 / 2.

[0014] Further, the cross-section of the engaging spring is an equilateral triangle.

[0015] Further, when the cross-section of the engaging spring is an equilateral triangle, the ratio of the width of the spiral engaging teeth to the width of the cross-section of the spiral engaging spring is less than or equal to 1 / 2, and the height of the spiral engaging teeth is the same as the height of the cross-section of the spiral engaging spring; the ratio of the height of the spiral engaging teeth to the groove height of the spiral groove is equal to 1 / 2.

[0016] Further, the spiral engaging teeth are of a double-thread spiral engaging teeth structure, the spiral groove is a single-thread spiral groove, the groove pitch of the spiral groove, the pitch of the spiral engaging teeth and the pitch of the spiral engaging spring are the same, the groove height of the spiral groove is twice the height of the cross-section of the spiral engaging spring, the groove width of the spiral groove is the same as the width of the cross-section of the spiral spring, the height of the spiral engaging teeth is the same as the height of the cross-section of the spiral engaging spring, and the width of the spiral engaging teeth is 1 / 2 of the width of the cross-section of the spiral engaging spring.

[0017] Further, a first serrated thread structure is provided in the spring engaging nut, the groove of the first serrated thread structure is the engaging spring receiving groove, and the non-working side of the first serrated thread structure is the second engaging surface;

[0018] A second serrated thread structure is provided on the plug, the second serrated thread structure is a double-thread serrated thread, and the working side of the second serrated thread structure is the first engaging surface.

[0019] Further, the angle between the non-working side and the working side of the serrated thread is 60°.

[0020] Furthermore, the helix direction of the spiral engaging teeth is opposite to that of the spiral engaging spring of the clamp on the spiral engaging teeth.

[0021] Furthermore, the outer diameter D1 corresponding to the tooth top of the first engaging teeth is the same as the inner diameter D2 corresponding to the top of the engaging spring receiving groove.

[0022] Furthermore, the tooth top of the first engaging teeth is subjected to diameter reduction treatment to form a tooth top surface; the top of the engaging spring receiving groove is subjected to diameter expansion treatment to form a groove top surface; the outer diameter D1 corresponding to the tooth top surface is smaller than the inner diameter D2 corresponding to the groove top surface.

[0023] Furthermore, the pitch of the spiral engaging teeth is 2.5 mm - 3 mm.

[0024] Furthermore, the inner diameter of the engaging spring is equal to or smaller than the diameter corresponding to the tooth root of the first engaging teeth.

[0025] Furthermore, a plug guiding portion is provided at the end of the plug.

[0026] Furthermore, a relief groove is provided at one end of the spring engaging nut away from the insertion of the plug.

[0027] Furthermore, a spring engaging nut tightening structure is provided at one end of the spring engaging nut close to the insertion of the plug; a positioning plug rod tightening structure is provided at the end of the plug.

[0028] A precast pile connection structure includes: a precast pile body, end plates provided at both ends of the precast pile body, and the mechanical joint of the present application;

[0029] The positioning plug rod is installed on the end plate at one end, and the spring engaging nut and the engaging spring are installed inside the end plate at the other end; adjacent two sections of precast piles are fixedly connected through the positioning plug rod, the spring engaging nut, and the engaging spring.

[0030] Furthermore, the positioning plug rod seat is connected to the tensioning and anchoring hole on the end plate at one end of the upper section of the pile, and the spring engaging nut is connected to the tensioning and anchoring hole on the end plate at one end of the lower section of the pile.

[0031] Compared with the prior art, the mechanical joint for precast component connection disclosed by the present utility model has the following beneficial effects: The mechanical joint for precast component connection disclosed by the present utility model can achieve rapid connection between concrete piles, realize assembled connection without changing the existing precast pile manufacturing process, has reliable connection, and low comprehensive cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1Structural diagram of the mechanical joint for precast component connection disclosed by the present utility model;

[0033] Figure 2 Structural diagram of the positioning plug rod in the present utility model;

[0034] Figure 3 Cross-sectional view of the positioning plug rod in the present utility model;

[0035] Figure 4 Structural diagram of the spring clamping nut in the present utility model;

[0036] Figure 5 Structural diagram of the spiral clamping spring in the present utility model;

[0037] Figure 6 Cross-sectional view of the spiral clamping spring in the present utility model;

[0038] Figure 7 Structural diagram of the pile connection structure using the mechanical joint disclosed by the present utility model;

[0039] Figure 8 Schematic diagram of the connection of two adjacent precast piles, only showing the end plate and the mechanical joint structure in the figure.

[0040] In the figure: 1, positioning plug rod; 10, positioning plug rod seat; 11, plug; 12, first locking tooth; 13, first clamping surface; 14, plug guiding part; 15, positioning plug rod tightening structure; 2, spring clamping nut; 20, clamping spring receiving groove; 21, second clamping surface; 22, relief groove; 23, spring clamping nut tightening structure; 3, clamping spring; 40, precast pile body; 41, end plate; 42, positioning plug rod connection hole; 43, spring clamping nut connection hole. Detailed implementation manners

[0041] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 shown, the mechanical joint for precast component connection disclosed by the present utility model includes: a positioning plug rod 1, a spring clamping nut 2 and a clamping spring 3;

[0042] The positioning plug rod 1 includes a positioning plug rod seat 10 and a plug 11 arranged on the positioning plug rod seat 10. The plug 11 is provided with a first locking tooth 12, and the first locking tooth 12 is provided with a first clamping surface 13;

[0043] The spring clamping nut 2 is internally provided with a clamping spring receiving groove 20 for accommodating the clamping spring 3, and the clamping spring receiving groove 20 is provided with a second clamping surface 21;

[0044] The clamping spring 3 is arranged in the clamping spring receiving groove 20; the plug 11 can be inserted into the spring clamping nut 2. When the plug 11 is inserted into the spring clamping nut 2, the clamping spring 3 can expand radially in the clamping spring receiving groove 20 and then clamp on the first locking teeth 12, and the positioning plug 1 and the spring clamping nut 2 are clamped through the first clamping surface 13, the second clamping surface 21 and the clamping spring 3.

[0045] Specifically, in this embodiment, the positioning plug 1 includes a cylindrical positioning plug base 10 for fixedly connecting with the end plate. In this embodiment, the positioning plug base 10 is provided with external threads for threaded connection with the end plate. A cylindrical plug 11 is arranged on the positioning plug base 10. The plug 11 is processed with first locking teeth 12, and a first clamping surface 13 is arranged on the first locking teeth; external threads for fixedly connecting with the end plate are arranged on the outer wall of the spring clamping nut 2, and a clamping spring receiving groove 20 is processed on the inner wall of the spring clamping nut 2. A second clamping surface 21 is arranged in the clamping spring receiving groove 20; the clamping spring 3 is arranged in the clamping spring receiving groove 20. When the plug 11 is inserted into the spring clamping nut 2, the plug 11 can expand the clamping spring 3 radially in the clamping spring receiving groove 20, so that the clamping spring clamps on the first locking teeth 12, and the positioning plug 1 and the spring clamping nut 2 are clamped through the first clamping surface 13, the second clamping surface 21 and the clamping spring 3.

[0046] The mechanical joint for precast component connection disclosed in this application can realize the rapid connection between concrete piles only by three components: a positioning plug, a spring clamping nut and a clamping spring. It can achieve assembled connection without changing the existing precast pile manufacturing process, with reliable connection and low comprehensive cost. At the same time, due to the adoption of the clamping spring, the first locking teeth and the clamping spring receiving groove structure, the plug and the spring clamping nut are more evenly stressed in the axial length direction, thereby improving the service life of the positioning plug and the spring clamping nut and enhancing the anti-pulling performance of the pile connection.

[0047] Furthermore, the first locking teeth 12 are one or more circles of annular locking teeth arranged on the plug 11; the clamping spring receiving groove 20 is one or more circles of annular grooves arranged in the spring clamping nut 2; the clamping spring 3 is an annular clamping spring.

[0048] Specifically, in the present application, one or more circles of annular tooth structures may be provided on the plug 11 to form the first teeth 12. One or more circles of annular grooves are machined in the spring snap nut 2 to form the snap spring accommodation grooves 20. The snap springs are annular snap springs. There may be one or more snap springs. One snap spring may be provided in each snap spring accommodation groove, or snap springs may be provided in several of the snap spring accommodation grooves, so as to realize the snap connection between the positioning rod and the spring snap nut.

[0049] Further, the first teeth 12 are spiral teeth provided on the plug 11; the snap spring accommodation grooves 20 are spiral grooves provided in the spring snap nut 2; the snap springs 3 are spiral snap springs.

[0050] Specifically, in the present application, preferably, a spiral tooth structure is provided on the plug to form the first teeth 12, a spiral groove structure is machined in the spring snap nut to form the snap spring accommodation grooves 20, and the snap springs are spiral snap springs. This structure is not only convenient for machining and installation, but also, due to the adoption of the spiral structure, the positioning rod, the spring snap nut and the snap springs are more uniformly stressed in the axial length direction, thereby improving the service life of the positioning rod and the spring snap nut, and improving the anti-pulling performance of the pile connection.

[0051] Further, the cross section of the snap spring 3 is triangular, circular or polygonal. Preferably, the cross section of the snap spring 3 is an equilateral triangle

[0052] Specifically, in the present application, the cross section of the spiral snap spring can be set to different shapes. In this embodiment, the cross section of the spiral snap spring can be triangular, circular or polygonal. When the cross section is triangular, circular or polygonal, the shapes of the snap spring accommodation grooves and the first teeth are adapted to the cross section shape of the snap spring, so as to realize the snap connection between the positioning rod and the spring snap nut through snap springs of different shapes.

[0053] Further, when the cross section of the snap spring 3 is circular, after the snap spring 3 is clamped in the first teeth 12, the outer diameter corresponding to the tooth top of the first teeth 12 is greater than or equal to the diameter corresponding to the center of the cross section of the snap spring;

[0054] When the cross section of the snap spring 3 is triangular, the ratio of the width of the first teeth 12 to the cross section width of the snap spring 3 is less than or equal to 1 / 2, and the height of the first teeth 12 is the same as the cross section height of the snap spring 3; the ratio of the height of the first teeth 12 to the groove height of the snap spring accommodation grooves 20 is equal to 1 / 2.

[0055] Specifically, when the cross-section of the clamping spring 3 is circular, after the clamping spring 3 is clamped in the first clamping tooth 12, the outer diameter corresponding to the tooth tip of the first clamping tooth 12 is greater than or equal to the diameter corresponding to the center of the cross-section of the clamping spring (i.e., the median diameter of the clamping spring). At this time, there is a relatively large clamping part between the first clamping surface on the first clamping tooth and the clamping spring, thereby improving the clamping strength. When the cross-section of the clamping spring 3 is triangular, the ratio of the width of the first clamping tooth 12 to the width of the cross-section of the clamping spring 3 is less than or equal to 1 / 2, and the height of the first clamping tooth 12 is the same as the height of the cross-section of the clamping spring 3; the ratio of the height of the first clamping tooth 12 to the groove height of the clamping spring receiving groove 20 is equal to 1 / 2, so that effective clamping can be achieved between the clamping tooth, the clamping spring, and the spring clamping nut.

[0056] Preferably, the cross-section of the spiral clamping spring adopts an equilateral triangle structure. The cross-section of the spiral clamping spring being an equilateral triangle can make the spiral clamping spring, the plug, and the spring clamping nut all in surface contact during clamping, thereby enabling it to obtain better anti-pulling performance.

[0057] Further, when the cross-section of the clamping spring 3 is an equilateral triangle, the ratio of the width of the spiral clamping tooth to the width of the cross-section of the spiral clamping spring is less than or equal to 1 / 2, and the height of the spiral clamping tooth is the same as the height of the cross-section of the spiral clamping spring; the ratio of the height of the spiral clamping tooth to the groove height of the spiral groove is equal to 1 / 2, so that effective clamping can be achieved between the clamping tooth, the clamping spring, and the spring clamping nut.

[0058] Further, the spiral clamping tooth is a double-thread spiral clamping tooth structure, the spiral groove is a single-thread spiral groove, the groove pitch P2 of the spiral groove, the pitch P1 of the spiral clamping tooth, and the pitch P3 of the spiral clamping spring are the same. The groove height H2 of the spiral groove is twice the cross-section height H3 of the spiral clamping spring. The groove width W2 of the spiral groove is the same as the cross-section width W3 of the spiral spring. The height H1 of the spiral clamping tooth is the same as the cross-section height H3 of the spiral clamping spring. The width W1 of the spiral clamping tooth is 1 / 2 of the cross-section width W3 of the spiral clamping spring.

[0059] Specifically, in this embodiment, the spiral engaging teeth are of a double-thread spiral engaging teeth structure, the spiral groove is a single-thread spiral groove, the pitch of the spiral groove, the pitch of the spiral engaging teeth, and the pitch of the spiral snap spring are the same. The groove height of the spiral groove is twice the cross-sectional height of the spiral snap spring, the groove width of the spiral groove is the same as the cross-sectional width of the spiral spring, the height of the spiral engaging teeth is the same as the cross-sectional height of the spiral snap spring, and the width of the spiral engaging teeth is 1 / 2 of the cross-sectional width of the spiral snap spring. After the plug is inserted into any position of the spring snap nut, the spiral snap spring can be clamped in the spiral engaging teeth, thus ensuring that the positioning plug rod and the spring snap nut can be effectively clamped. At the same time, since the width of the spiral engaging teeth is 1 / 2 of the cross-sectional width of the spiral snap spring, when the plug, the snap spring, and the spring snap nut are subjected to a pulling force, the acting force is located at the center of the cross-section of the snap spring, thereby improving the stress performance of the snap spring, increasing the strength of the snap spring, and improving the anti-pulling performance of the pile connection.

[0060] Further, a first serrated thread structure is provided in the spring snap nut 2. The groove of the first serrated thread structure is a snap spring receiving groove 20, and the non-working side (the side with a larger inclination angle) of the first serrated thread structure is a second engaging surface 21;

[0061] A second serrated thread structure is provided on the plug 11. The second serrated thread structure is a double-thread serrated thread, and the working side (the side with a smaller inclination angle) of the second serrated thread structure is a first engaging surface 13.

[0062] In this embodiment, a first serrated thread is provided in the spring snap nut. The groove of the first serrated thread structure is a snap spring receiving groove, and the non-working side of the first serrated thread structure is a second engaging surface; a second serrated thread structure is provided on the plug. The second serrated thread structure is a double-thread serrated thread, and the working side of the second serrated thread structure is a first engaging surface, so that the spiral snap spring has a large contact area with both the first engaging surface and the second engaging surface. At the same time, the engaging parts of the spring snap nut and the plug have strong strength, thereby improving the anti-pulling performance of the pile connection.

[0063] Further, the included angle between the non-working side and the working side of the serrated thread is 60°, so that the positioning plug rod, the snap spring, and the spring snap nut have good stress performance, thereby increasing the anti-pulling strength.

[0064] Further, the helix direction of the spiral engaging teeth is opposite to the helix direction of the spiral snap spring clamped on the spiral engaging teeth.

[0065] Specifically, in this embodiment, the spiral engaging teeth are arranged in a positive helix direction from the end of the plug towards the positioning plug rod seat;

[0066] After the spiral snap spring clamp is in the first tooth, the spiral snap spring is set to rotate clockwise from the positioning plug seat towards the end of the plug. Since the spiral teeth are set to rotate clockwise from the end of the plug towards the positioning plug seat; after the spiral snap spring clamp is in the first tooth, the spiral snap spring is set to rotate clockwise from the positioning plug seat towards the end of the plug, thereby reducing or eliminating the slip of the positioning plug, the snap spring, and the spring snap nut along the axial direction of the positioning plug when subjected to a pulling force.

[0067] Furthermore, the outer diameter corresponding to the crest of the first tooth 12 is consistent with the inner diameter dimension corresponding to the top of the snap spring receiving groove 20.

[0068] Specifically, the outer diameter D1 corresponding to the crest of the first tooth 12 is consistent with the inner diameter D2 dimension corresponding to the top of the snap spring receiving groove 20, enabling the positioning plug to be effectively inserted into the spring snap nut.

[0069] Furthermore, the crest of the first tooth 12 is subjected to a diameter reduction treatment to form a tooth top surface 16; the top of the snap spring receiving groove 20 is subjected to a diameter expansion treatment to form a groove top surface 24; the outer diameter corresponding to the tooth top surface 16 is smaller than the inner diameter corresponding to the groove top surface 24.

[0070] Specifically, in this embodiment, since the crest of the first tooth 12 is subjected to a diameter reduction treatment to form a tooth top surface 16, the diameter reduction treatment in this application is to process the relatively sharp part of the tooth top through machining to obtain a tooth top surface, thereby removing the relatively sharp part of the tooth tip, that is, removing the weak part at the tooth tip; correspondingly, the top of the snap spring receiving groove is also subjected to a diameter expansion treatment, that is, removing the weak part at the groove top; furthermore, the outer diameter corresponding to the tooth top surface 16 is smaller than the inner diameter corresponding to the groove top surface 24, so that the positioning plug can be conveniently inserted into the spring snap nut without causing damage to the first tooth or the snap spring receiving groove. At the same time, due to the certain gap between the first tooth and the snap spring receiving groove, the first contact surface of the first tooth with the snap spring and the second contact surface of the snap spring receiving groove with the snap spring can be in closer contact, thereby improving the anti-pulling performance of the pile connection.

[0071] Furthermore, the pitch of the spiral teeth 12 is 2.5 mm - 3 mm.

[0072] Specifically, the pitch of the spiral teeth 12 is 2.5 mm - 3 mm. Correspondingly, the groove pitch of the snap spring receiving groove 20 and the pitch of the spiral snap spring are both 5 mm - 6 mm. After testing, the strength after clamping of the teeth corresponding to this pitch, the snap spring receiving groove corresponding to the groove pitch, and the spiral snap spring corresponding to the pitch is greater than or equal to the requirements for the connection strength of precast piles in relevant standards.

[0073] Further, the inner diameter of the clamping spring 3 is smaller than the diameter of the root of the first tooth 12.

[0074] Specifically, the inner diameter of the clamping spring is smaller than the diameter of the root of the first tooth, so that after the plug is inserted into the spring clamping nut, the clamping spring can be firmly clamped in the first tooth of the plug, thereby improving the clamping performance between the positioning rod and the spring clamping nut.

[0075] Further, a plug guiding portion 14 is provided at the end of the plug 11.

[0076] Specifically, the end of the plug can be an inclined surface or a smooth curved surface so that the diameter at the end face of the plug is the smallest and gradually increases to be the same as the diameter of the clamping portion of the plug, thereby forming the plug guiding portion, so that during the process of inserting the plug into the spring clamping nut, the end of the plug can be conveniently inserted into the spiral clamping spring and the spiral clamping spring is radially expanded.

[0077] Further, a relief groove 22 is provided at the end of the spring clamping nut 2 away from the insertion of the plug.

[0078] Specifically, a relief groove 22 is provided at the end of the spring clamping nut 2 away from the insertion of the plug. Due to the provision of the relief groove, the depth of the root of the serrated thread in the spring clamping nut can be ensured to be consistent, thereby improving the connection performance between the positioning rod and the spring clamping nut.

[0079] Further, a spring clamping nut tightening structure 23 is provided at the end of the spring clamping nut 2 close to the insertion of the plug; a positioning rod tightening structure 15 is provided at the end of the plug 11.

[0080] Specifically, the spring clamping nut tightening structure 23 can be a structure with a "one"-shaped groove or a polygonal groove provided at the end of the spring clamping nut close to the insertion of the plug, so as to facilitate the quick connection of the spring clamping nut and the end plate by clamping a "one"-shaped screwdriver or a polygonal screwdriver and other structures with power tools; a polygonal hole is provided at the end of the plug, and the positioning rod and the end plate can be quickly connected by clamping a polygonal screwdriver with a power tool.

[0081] As Figure 7 and Figure 8 shown in the precast pile connection structure disclosed by the present utility model, which includes: a precast pile body 40, end plates 41 provided at both ends of the precast pile body, and the mechanical joint described in the present application;

[0082] The end plate 41 at one end is provided with the positioning rod 1, and the spring clamping nut 2 and the clamping spring 3 are installed in the end plate 41 at the other end;

[0083] Two adjacent precast piles are fixedly connected through the positioning insertion rod 1, the spring snap nut 2 and the snap spring 3.

[0084] Specifically, the precast pile with end plates includes structures such as a precast pile body, a steel cage, and end plates. The steel cage is arranged inside the precast pile body, and the end plates are arranged at both ends of the precast pile body and connected to both ends of the main steel bars of the steel cage. The end plate at one end is provided with a main steel bar connection hole and a positioning insertion rod connection hole 42, and the end plate at the other end is provided with a main steel bar connection hole and a spring snap nut connection hole 43. The main steel bar connection hole is used to connect with the main steel bars of the steel cage. In this embodiment, the positioning insertion rod seat is threadedly connected to the positioning insertion rod connection hole 42, and the spring snap nut is threadedly connected to the spring snap nut connection hole. A snap spring is arranged inside the spring snap nut. When two adjacent precast concrete piles are connected, the end of the precast concrete pile provided with the positioning insertion rod can be snap-connected with the end of the adjacent precast concrete pile provided with the spring snap nut through the positioning insertion rod, the spring snap nut, and the snap spring, thereby realizing the connection of two adjacent precast concrete piles.

[0085] Furthermore, the positioning insertion rod seat is connected to the tension anchoring hole on the end plate at one end of the upper pile, and the spring snap nut is connected to the tension anchoring hole on the end plate at one end of the lower pile.

[0086] Specifically, in this embodiment, both the positioning insertion rod connection hole 42 and the spring snap nut connection hole 43 are tension anchoring holes on the end plate. The positioning insertion rod seat is connected to the tension anchoring hole on the end plate at the lower end of the upper pile, and the spring snap nut is connected to the tension anchoring hole on the end plate at the upper end of the lower pile. That is, in this embodiment, without changing the existing end plate structure, the existing tension anchoring holes on the end plate are directly used to realize the connection with the positioning insertion rod and the spring snap nut, thereby realizing the mechanical connection of the precast pile, that is, realizing the assembled connection without changing the existing precast pile manufacturing process. The connection is reliable and the comprehensive cost is low.

[0087] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A mechanical joint for precast component connection, characterized in that, Comprising: A positioning plug rod (1), a spring clamping nut (2), and a clamping spring (3); The positioning plug rod (1) includes a positioning plug rod seat (10) and a plug (11) provided on the positioning plug rod seat (10). A first engaging tooth (12) is provided on the plug (11), and a first engaging surface (13) is provided on the first engaging tooth (12); A clamping spring receiving groove (20) for receiving the clamping spring (3) is provided inside the spring clamping nut (2), and a second engaging surface (21) is provided inside the clamping spring receiving groove (20); The clamping spring (3) is arranged inside the clamping spring receiving groove (20); the plug (11) can be inserted into the spring clamping nut (2). When the plug (11) is inserted into the spring clamping nut (2), the clamping spring (3) can expand radially inside the clamping spring receiving groove (20) and then clamp onto the first engaging tooth (12), and the clamping of the positioning plug rod (1) and the spring clamping nut (2) is achieved through the first engaging surface (13), the second engaging surface (21), and the clamping spring (3).

2. The mechanical joint for precast component connection according to claim 1, characterized in that: The first engaging tooth (12) is one or more circles of annular engaging teeth provided on the plug (11); the clamping spring receiving groove (20) is one or more circles of annular grooves provided inside the spring clamping nut (2); the clamping spring (3) is an annular clamping spring.

3. The mechanical joint for prefabricated component connection according to claim 1, characterized in that: The first engaging tooth (12) is a spiral engaging tooth provided on the plug (11); the clamping spring receiving groove (20) is a spiral groove provided inside the spring clamping nut (2); the clamping spring (3) is a spiral clamping spring.

4. The mechanical joint for prefabricated component connection according to claim 1 or 2, characterized in that: The cross-section of the clamping spring (3) is triangular, circular, or polygonal.

5. The mechanical joint for precast component connection according to claim 3, wherein: When the cross-section of the clamping spring (3) is circular, after the clamping spring (3) clamps onto the first engaging tooth (12), the outer diameter corresponding to the tooth tip of the first engaging tooth (12) is greater than or equal to the diameter corresponding to the center of the cross-section of the clamping spring; When the cross-section of the clamping spring (3) is triangular, the ratio of the width of the first engaging tooth (12) to the width of the cross-section of the clamping spring (3) is less than or equal to 1 / 2, and the height of the first engaging tooth (12) is the same as the height of the cross-section of the clamping spring (3); the ratio of the height of the first engaging tooth (12) to the groove height of the clamping spring receiving groove (20) is equal to 1 / 2.

6. The mechanical joint for prefabricated component connection according to claim 3, characterized in that: The cross-section of the clamping spring (3) is an equilateral triangle.

7. The mechanical joint for precast component connection according to claim 6, wherein: When the cross-section of the clamping spring (3) is an equilateral triangle, the ratio of the width of the spiral engaging tooth to the width of the cross-section of the spiral clamping spring is less than or equal to 1 / 2, and the height of the spiral engaging tooth is the same as the height of the cross-section of the spiral clamping spring; the ratio of the height of the spiral engaging tooth to the groove height of the spiral groove is equal to 1 / 2.

8. The mechanical joint for prefabricated component connection according to claim 7, characterized in that: The spiral engaging teeth are of a double-thread spiral engaging teeth structure, the spiral groove is a single-thread spiral groove, the pitch of the spiral groove, the pitch of the spiral engaging teeth, and the pitch of the spiral engaging spring are the same, the groove height of the spiral groove is twice the cross-sectional height of the spiral engaging spring, the groove width of the spiral groove is the same as the cross-sectional width of the spiral engaging spring, the height of the spiral engaging teeth is the same as the cross-sectional height of the spiral engaging spring, and the width of the spiral engaging teeth is 1 / 2 of the cross-sectional width of the spiral engaging spring.

9. The mechanical joint for prefabricated component connection according to claim 8, characterized in that: The spring engaging nut (2) is internally provided with a first serrated thread structure, the groove of the first serrated thread structure is the engaging spring accommodating groove (20), and the non-working side of the first serrated thread structure is the second engaging surface (21); The plug (11) is provided with a second serrated thread structure, the second serrated thread structure is a double-thread serrated thread, and the working side of the second serrated thread structure is the first engaging surface (13).

10. The mechanical joint for precast component connection according to claim 9, characterized in that: The angle between the non-working side and the working side of the serrated thread is 60°.

11. The mechanical joint for prefabricated component connection according to any one of claims 3, 5 to 10, characterized in that: The helix direction of the spiral engaging teeth is opposite to the helix direction of the spiral engaging spring of the clamp on the spiral engaging teeth.

12. The mechanical joint for prefabricated component connection according to claim 11, characterized in that: The outer diameter D1 corresponding to the tooth top of the first engaging teeth (12) is the same as the inner diameter D2 corresponding to the groove top of the engaging spring accommodating groove (20).

13. The mechanical joint for prefabricated component connection according to claim 12, characterized in that: The tooth top of the first engaging teeth (12) is subjected to a diameter reduction treatment to form a tooth top surface (16); the groove top of the engaging spring accommodating groove (20) is subjected to a diameter expansion treatment to form a groove top surface (24); the outer diameter D1 corresponding to the tooth top surface (16) is smaller than the inner diameter D2 corresponding to the groove top surface (24).

14. The mechanical joint for prefabricated component connection according to claim 13, characterized in that: The tooth pitch of the spiral engaging teeth is 2.5 mm - 3 mm.

15. The mechanical joint for prefabricated component connection according to claim 1, characterized in that: The inner diameter of the engaging spring (3) is equal to or less than the diameter corresponding to the tooth root of the first engaging teeth (12).

16. The mechanical joint for prefabricated component connection according to claim 1, characterized in that: The end of the plug (11) is provided with a plug guiding portion (14).

17. The mechanical joint for prefabricated component connection according to claim 1, characterized in that: The spring engaging nut (2) is further provided with a relief groove (22) at one end far from the insertion of the plug (11).

18. The mechanical joint for prefabricated component connection according to claim 1, characterized in that: The spring engaging nut (2) is provided with a spring engaging nut tightening structure (23) at one end close to the insertion of the plug (11); the end of the plug (11) is provided with a positioning plug rod tightening structure (15).

19. A precast pile connection structure, characterized in that, Comprising: A precast pile body, end plates provided at both ends of the precast pile body, and the mechanical joint according to any one of claims 1 - 18; The positioning plug rod is installed on the end plate at one end, and the spring engaging nut and the engaging spring are installed in the end plate at the other end; adjacent two sections of precast piles are fixedly connected through the positioning plug rod, the spring engaging nut, and the engaging spring.

20. The precast pile connection structure according to claim 19, characterized in that: The positioning plug rod seat is connected to the tensioning and anchoring hole on the end plate at one end of the upper section of the pile, and the spring engaging nut is connected to the tensioning and anchoring hole on the end plate at one end of the lower section of the pile.

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