CN218990142U - Mechanical connecting piece and precast pile combination - Google Patents

Abstract

The utility model provides a mechanical connecting piece and precast pile combination, wherein the mechanical connecting piece comprises a first external sleeve, a second external sleeve, a plugging rod, a clamping component and a first fastening ring; the inserting connection rod is in threaded connection with the first external sleeve, and the other end of the inserting connection rod is an inserting connection end; the clamping component is internally arranged in the first external sleeve; the first fastening ring is provided with an internal thread in threaded connection with the external thread connecting end and axially abuts against the first external sleeve, or the first fastening ring is provided with an external thread in threaded connection with the inner wall of the first external sleeve and axially abuts against the external thread connecting end of the inserting connection rod. After the plugging rod is installed, the plugging rod is clamped on the first external sleeve through the first fastening ring, so that when vertical drawing force or transverse shearing force is born, the external threaded connection end of the plugging rod and the first external sleeve are always in a tight abutting state, and the plugging rod and the first external sleeve form a stable connected integral structure, so that the tensile anti-drop performance of the mechanical connecting piece is improved.

Description

Mechanical connecting piece and precast pile combination

Technical Field

The utility model relates to the technical field of connectors, in particular to a mechanical connector for connecting precast piles.

The utility model also relates to a precast pile assembly connected by the mechanical connector.

Background

The precast pile needs to be connected with other precast piles during construction so as to form an integral component meeting the design requirements.

The traditional pile splicing mode adopts end plate welding, but the end plate welding mode is greatly influenced by weather factors and human factors, has the defects of difficult guarantee of weld quality, high construction difficulty and easy corrosion of underground soil, and in addition, as main stress tendons in the upper precast pile and the lower precast pile are not connected, reinforcement cages in the two precast piles are mutually independent, so that the strength of the connected integral member is relatively weak. In order to solve the defects, the mechanical connecting piece for pile splicing, which is free from welding and can be directly spliced, is arranged, and comprises a small nut and a large nut, wherein the small nut is fixedly provided with an inserting rod, the splicing end of the inserting rod is provided with an expanding head, and the large nut is internally provided with a release stopping piece which can be used for inserting and forming clamping fit with the expanding head of the inserting rod.

However, the plug rod and the small nut of the existing mechanical connector are connected through threads, as shown in fig. 3, and in combination with fig. 4, which is a partial enlarged view of the position a in fig. 3, it can be known that, after the plug connector and the first external sleeve 1 are screwed together due to the production process and the threaded connection characteristic, a gap (mark) exists at the threaded connection position of the plug rod 3 and the first external sleeve 1, when the vertical pulling force and the transverse shearing force are born, the existence of the gap (mark) causes the force transmission of the mechanical connector to be discontinuous, and the plug rod 3 can move relative to the first external sleeve 1, so that the connection of two precast piles vertically butted through the mechanical connector is unstable.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a mechanical connecting piece and precast pile combination.

In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme:

a mechanical connector, comprising: the first external sleeve;

the second external sleeve is internally provided with an inserting cavity;

the axial end of the inserting rod is provided with an external thread connecting end which is in threaded connection with the first external sleeve, and the other end of the inserting rod forms an inserting end which can extend into the inserting cavity;

the clamping component is arranged in the first external sleeve and used for locking the plug-in end; and

the first fastening ring is provided with an internal thread in threaded connection with the external thread connecting end and axially abuts against the first external sleeve.

Compared with the prior art, the mechanical connecting piece has the beneficial effects that: through set up first fastening ring and make first fastening ring axial butt first external sleeve at grafting pole external screw connection end outer wall for make the grafting pole chucking through first fastening ring after the grafting pole installation on first external sleeve, so that when bearing vertical pulling force or transverse shear force, grafting pole external screw connection end and first external sleeve are in the tight state all the time, and grafting pole and first external sleeve form stable connected overall structure, thereby improve the tensile anticreep performance of mechanical connection piece.

The present utility model also provides another mechanical connector comprising: the first external sleeve;

the second external sleeve is internally provided with an inserting cavity;

the axial end of the inserting rod is provided with an external thread connecting end which is fixedly connected with the first external sleeve in a threaded manner, and the other end of the inserting rod forms an inserting end which can extend into the inserting cavity;

the clamping component is arranged in the first external sleeve and used for locking the plug-in end; and

the first fastening ring is provided with an external thread in threaded connection with the inner wall of the first external sleeve and axially abuts against the external thread connecting end of the plug rod, and a radial gap is formed between the first fastening ring and the rod body of the plug rod.

Compared with the prior art, the other mechanical connecting piece has the beneficial effects that: the external thread connecting end of the plugging rod and the first external sleeve are always in a propping state when bearing vertical drawing force or transverse shearing force, the plugging rod and the first external sleeve form a stable connected integral structure, and the tensile anti-drop performance of the mechanical connecting piece is improved. In addition, through setting up the radial clearance that exists between the body of rod of first fastening ring and plug rod, the first fastening ring installation of being convenient for prevents that first fastening ring and plug rod's body of rod from producing the interference.

Further, the outer diameter of the first fastening ring is smaller than or equal to the outer diameter of the first circumscribing sleeve;

the mechanical connecting piece further comprises a second fastening ring, wherein the second fastening ring is in threaded connection with the outer wall of the clamping assembly and axially abuts against the second external sleeve, or the second fastening ring is in threaded connection with the inner wall of the second external sleeve and axially abuts against the clamping assembly.

Further, a lock washer is arranged between the first fastening ring and the first external sleeve or between the first fastening ring and the external threaded connection end of the plug rod, between the second fastening ring and the second external sleeve or between the second fastening ring and the clamping component;

and/or the outer diameter of the second fastening ring is smaller than or equal to the outer diameter of the second external sleeve;

and/or the axial end part of the first fastening ring or the second fastening ring is provided with a screwing force application part.

Further, the clamping assembly comprises a plurality of arc-shaped clamping blocks, an outer dental tube and an elastic supporting piece, wherein the arc-shaped clamping blocks, the outer dental tube and the elastic supporting piece are circumferentially and circumferentially arranged, the outer dental tube is in threaded connection with the second external sleeve and is abutted against the arc-shaped clamping blocks, the elastic supporting piece is arranged at the bottom of the cavity of the inserting cavity and is abutted against the arc-shaped clamping blocks towards the outer dental tube, gaskets are arranged between the elastic supporting piece and the arc-shaped clamping blocks, the inserting ends are reducing inserting connectors, a plurality of arc-shaped clamping blocks are surrounded to form inserting channels for the reducing inserting connectors to be inserted, and the arc-shaped clamping blocks are reversely clamped to the reducing inserting connectors;

the arc fixture block is split type structure, or arc fixture block bottom links to each other.

Further, a flange is arranged at one end, far away from the plug-in cavity, of the outer dental tube, and the flange is abutted to the end face of the second external sleeve.

Further, the clamping assembly comprises more than two wedge-shaped clamping pieces which are distributed in an annular arrangement mode, an outer dental canal which is connected with the second outer sleeve in a threaded mode and is abutted to the wedge-shaped clamping pieces in a threaded mode, an elastic supporting piece which is arranged at the bottom of the inserting cavity and pushes the wedge-shaped clamping pieces against the outer dental canal, an inner cone blocking surface is arranged on the inner wall of the outer dental canal, an outer inclined conical surface matched with the inner cone blocking surface is arranged on the outer wall of the wedge-shaped clamping pieces, more than two wedge-shaped clamping pieces which are distributed in an annular arrangement mode enclose to form an inserting channel for the inserting end to insert, and an elastic ring is arranged on the outer hoop of the wedge-shaped clamping pieces.

Further, the plug end is provided with a through hole, an included angle alpha is formed between the axial lead of the through hole and the axial lead of the plug rod, alpha is more than 0 degrees and less than or equal to 90 degrees, epoxy resin is filled in the plug cavity of the second external sleeve, and when the plug end is inserted into the plug cavity, the epoxy resin is filled into the through hole.

Further, the plug rod is provided with at least one spiral groove on the outer peripheral wall of the rod body between the external thread connecting end and the plug end, the clamping component is provided with at least one groove, and when the clamping component locks the plug rod, the groove is communicated with the spiral groove.

Another object of the present utility model is to provide a precast pile assembly, comprising at least two precast piles sequentially longitudinally butted by the mechanical connectors; in the two adjacent precast piles, the end part of the upper precast pile is provided with a first external sleeve connected with the inserting connection rod, and the end part of the lower precast pile is provided with a second external sleeve for installing the clamping component; wherein, first fastening intra-annular indent or flush is in precast pile terminal surface.

The precast pile combination provided by the utility model adopts the mechanical connecting piece, so that the precast pile combination has the same technical effect as the mechanical connecting piece. In addition, the precast pile combination provided by the utility model has the effects of convenience in butt joint and high pile foundation construction efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a first mechanical connector in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a second mechanical connector in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a prior art connector;

FIG. 4 is an enlarged view at A in FIG. 3;

FIG. 5 is a schematic cross-sectional view of a third mechanical connector in accordance with an embodiment of the utility model;

FIG. 6 is a schematic cross-sectional view of a fourth mechanical connector according to an embodiment of the present utility model;

FIG. 7 is a schematic cross-sectional view of a fifth mechanical connector according to an embodiment of the present utility model;

FIG. 8 is a schematic cross-sectional view of a plugging rod according to an embodiment of the present utility model;

FIG. 9 is a schematic perspective view of another plugging rod according to the embodiment of the present utility model;

fig. 10 is a schematic view illustrating a structure of a precast pile assembly according to an embodiment of the present utility model.

Reference numerals:

1. the first external sleeve;

2. the second external sleeve;

3. inserting a connecting rod; 31. an external threaded connection end; 32. a plug end; 321. a reducing plug; 33. a rod body; 34. a through hole; 35. a spiral groove;

4. a locking assembly; 41. an arc-shaped clamping block; 42. an outer dental tube; 421. a flange; 43. an elastic support; 431. a gasket; 44. a wedge-shaped clamping piece; 45. an elastic ring;

5. a first fastening ring;

6. a second fastening ring;

7. a lock washer;

8. a gap;

100. and (5) precast piles.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments.

In the present specification, the terms "upper, lower, inner, outer" and the like are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may be changed according to the drawings, so that the terms are not to be construed as absolute limitation of the protection scope; moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

Embodiment 1,

Referring to fig. 1, 5 and 6, the present embodiment provides a mechanical connector for butt-jointing two precast piles, which includes a first external sleeve 1, a second external sleeve 2, a plugging rod 3, a locking assembly 4 and a first fastening ring 5; a plug cavity is formed in the second outer sleeve 2; one axial end of the inserting connection rod 3 is provided with an external thread connecting end 31 which is in threaded connection with the first external sleeve 1, and the other axial end of the inserting connection rod forms an inserting connection end 32 which can extend into the inserting cavity; the locking component 4 is internally arranged in the first external sleeve 1 and used for locking the plug-in end 32; the first fastening ring 5 has an internal thread screwed with the external thread connecting end 31 and axially abuts against the first external sleeve 1.

In this embodiment, as shown in fig. 1, after the plugging rod 3 is screwed with the first external sleeve 1, the external threaded connection end 31 of the plugging rod 3 extends out of the first external sleeve 1 toward the second external sleeve 2, the external threaded connection end 31 extending out of the first external sleeve is screwed with the first fastening ring 5, and the first fastening ring 5 is screwed into the first external sleeve 1 until abutting against the end face of the first external sleeve 1. Because the first external sleeve 1 is pre-buried and fixed in the pile end surface during production, after the first fastening ring 5 is screwed in until tightly abutting against the first external sleeve 1, the first fastening ring 5 enables the plugging rod 3 to be clamped on the first external sleeve 1, so that when vertical drawing force or transverse shearing force is born, the external threaded connection end 31 of the plugging rod 3 and the first external sleeve 1 are always in a tightly abutting state, a stable connected integral structure is formed between the plugging rod 3 and the first external sleeve 1, and in the actual stress process, no matter the vertical drawing force or the transverse shearing force is born, the threaded connection part of the plugging rod 3 and the first external sleeve 1 does not move relatively, and is always in a tightly abutting state, so that the tensile anti-drop performance of the mechanical connector is improved.

Example two

In this embodiment, the same reference numerals are given to the same parts as those of the first embodiment, and the same description is omitted.

Referring to fig. 2, compared with the first embodiment, the present embodiment provides a mechanical connector, which includes a first external sleeve 1, a second external sleeve 2, a plugging rod 3, a locking assembly 4 and a first fastening ring 5; a plug cavity is formed in the second outer sleeve 2; one axial end of the inserting connection rod 3 is provided with an external thread connecting end 31 which is in threaded connection with the first external sleeve 1, and the other axial end of the inserting connection rod forms an inserting connection end 32 which can extend into the inserting cavity; the locking component 4 is internally arranged in the first external sleeve 1 and used for locking the plug-in end 32; the first fastening ring 5 has an external thread screwed with the inner wall of the first external sleeve 1 and axially abuts against the external thread connection end 31 of the plugging rod 3, and a radial gap is formed between the first fastening ring 5 and the rod body 33 of the plugging rod 3.

Specifically, as shown in fig. 2, after the plugging rod 3 is in butt joint with the first external sleeve 1, the external threaded connection end 31 of the plugging rod 3 is completely placed in the first external sleeve 1, a shoulder surface with a size step reduced is formed between the external threaded connection end 31 and a rod body 33 connected with the external threaded connection end 31, a first fastening ring 5 arranged on the shoulder surface is axially abutted against the external threaded connection end 31 of the plugging rod 3, after the first fastening ring 5 is screwed into the inner wall of the first external sleeve 1 until the shoulder surface is abutted against, the first fastening ring 5 enables the plugging rod 3 to be clamped on the first external sleeve 1, so that when vertical drawing force or transverse shearing force is borne, the external threaded connection end 31 of the plugging rod 3 and the first external sleeve 1 are always in an abutting state, and a stable connected integral structure is formed between the plugging rod 3 and the first external sleeve 1. In addition, in order to facilitate the installation of the first fastening ring 5 and prevent the rod body 33 of the plugging rod 3 from interfering, a radial gap exists between the first fastening ring 5 and the rod body 33 of the plugging rod 3, i.e. the inner diameter of the first fastening ring 5 is smaller than the diameter of the rod body 33 of the plugging rod 3.

Example III

In this embodiment, the same portions as those in the first and second embodiments are given the same reference numerals, and the same description is omitted.

Compared with the first embodiment and the second embodiment, the mechanical connecting piece provided by the present embodiment has such a different structural design:

referring to fig. 1, 2 and 6, in order to facilitate the installation of the first fastening ring 5, the outer diameter of the first fastening ring 5 is smaller than or equal to the outer diameter of the first circumscribing sleeve 1; in addition, the mechanical connecting piece further comprises a second fastening ring 6, wherein the second fastening ring 6 is in threaded connection with the outer wall of the clamping component 4 and axially abuts against the second external sleeve 2, or the second fastening ring 6 is in threaded connection with the inner wall of the inserting cavity of the second external sleeve 2 and axially abuts against the clamping component 4.

Specifically, the main connection mode of the locking assembly 4 of the existing connecting piece and the second external sleeve 2 is also threaded connection, so that the same problem that a gap exists between the locking assembly 4 and the threaded connection position of the plugging rod 3 and the first external sleeve 1 also exists, and the plugging end 32 of the plugging rod 3 is locked by the locking assembly 4, so that when the plugging rod 3 bears vertical drawing force, the plugging rod 3 can drive the locking assembly 4 to relatively move due to the existence of the gap between the threaded connection position of the locking assembly 4 and the second external sleeve 2, and the connection of two precast piles vertically butted by the connecting piece is unstable.

In this embodiment, as shown in fig. 1, the locking component 4 extends partially out of the second outer sleeve 2, and a second fastening ring 6 is disposed at the extending portion of the locking component 4, where the second fastening ring 6 is screwed along the extending portion of the locking component 4 toward the second outer sleeve 2 until the second outer sleeve 2 is axially abutted, or, as shown in fig. 2, the locking component 4 is completely disposed in the second outer sleeve 2, and the second fastening ring 6 is screwed along the inner wall of the second outer sleeve 2 until the second fastening ring axially abuts against the upper surface of the locking component 4, that is, the locking component 4 is clamped on the second outer sleeve 2 by the second fastening ring 6, so that when a force is applied, the joint of the locking component 4 and the first outer sleeve 1 is always kept in a fixed state.

Further, referring to fig. 6, a lock washer 7 is disposed between the first fastening ring 5 and the first external sleeve 1 or between the first fastening ring 5 and the external threaded connection end 31 of the plugging rod 3, and a lock washer 7 is disposed between the second fastening ring 6 and the second external sleeve 2 or between the second fastening ring 6 and the locking assembly 4, so that friction force between two connected parts can be increased by arranging the lock washer 7, tightness is ensured, and service life of the mechanical connector is prolonged.

In addition, in order to facilitate the installation of the second fastening ring 6, the outer diameter of the second fastening ring 6 is smaller than or equal to the outer diameter of the second circumscribing sleeve 2; in addition, for convenience of installation, a screwing force application portion is provided at an axial end portion of the first fastening ring 5 or the second fastening ring 6, so that an external force application tool can apply a force to the screwing force application portion to drive the first fastening ring 5 or the second fastening ring 6 to rotate circumferentially, wherein the screwing force application portion may be an external polygonal structure or a structure such as a straight line or a cross groove, or may be a screwing hole provided at an axial end portion of the first fastening ring 5 or the second fastening ring 6, which is not limited herein.

Further, referring to fig. 1 and 2, the locking assembly 4 includes a plurality of arc-shaped clamping blocks 41 circumferentially surrounding the locking assembly, an outer dental tube 42 and an elastic supporting member 43, the outer dental tube 42 is screwed to the second external sleeve 2 and abuts against the arc-shaped clamping blocks 41, the elastic supporting member 43 is disposed at the bottom of the cavity of the inserting cavity and abuts against the arc-shaped clamping blocks 41 in the direction of the outer dental tube 42, the plurality of arc-shaped clamping blocks 41 enclose to form an inserting channel for inserting the inserting rod 3, preferably four of the embodiment, gaskets 431 are disposed between the elastic supporting member 43 and the arc-shaped clamping blocks 41, the elastic supporting member 43 is preferably a spring, wherein the inserting end 32 is a reducing inserting head 321, when the inserting rod 3 is inserted, the buckling barrel is driven to compress the elastic supporting member 43 downwards, the reducing inserting head 321 stretches the arc-shaped clamping blocks 41, after the reducing inserting head 321 passes through the arc-shaped clamping blocks 41, the supporting member 43 enables the arc-shaped clamping blocks 41 to reset and lock the reducing inserting head 321, wherein the arc-shaped clamping blocks 41 are of a split structure, or the bottoms of the arc-shaped clamping blocks 41 are connected to form a buckling barrel structure, and each arc-shaped clamping block 41 is arranged at intervals.

Further, referring to fig. 5, a flange 421 is disposed at one end of the outer dental tube 42 away from the insertion cavity, and when the outer dental tube 42 is screwed into the predetermined position of the second external sleeve 2, the flange 421 abuts against the end surface of the second external sleeve 2, so as to achieve the fastening connection between the outer dental tube 42 and the second external sleeve 2.

Example IV

In this embodiment, the same reference numerals are given to the same parts as those of the first to third embodiments, and the same description is omitted.

Compared with the first to third embodiments, the mechanical connector provided by the present embodiment has such a different structural design:

referring to fig. 7, the locking assembly 4 includes more than two wedge-shaped clamping pieces 44 distributed in an annular arrangement, an outer dental tube 42 screwed on the second external sleeve 2 and abutting against the wedge-shaped clamping pieces 44, and an elastic support 43 disposed at the bottom of the insertion cavity and pushing the wedge-shaped clamping pieces 44 against the outer dental tube 42, wherein the inner wall of the outer dental tube 42 has an inner conical blocking surface, the outer wall of the wedge-shaped clamping pieces 44 is provided with an outer inclined conical surface adapted to the inner conical blocking surface, more than two wedge-shaped clamping pieces 44 distributed in an annular arrangement enclose to form an insertion passage for the insertion of the insertion end 32, and an elastic ring 45 is arranged outside the wedge-shaped clamping pieces 44 in a hooping manner to enable the wedge-shaped clamping pieces 44 to form an integral structure, so that the wedge-shaped clamping pieces cannot scatter when the wedge-shaped clamping pieces are opened and reset. Specifically, when the plugging end 32 of the plugging rod 3 is plugged, the wedge-shaped clamping piece 44 is driven to compress the elastic supporting piece 43 to move downwards, so that the wedge-shaped clamping piece 44 is radially spread, and after the plugging end 32 is plugged in place, the elastic supporting piece 43 and the elastic ring 45 enable the wedge-shaped clamping piece 44 to reversely clamp the plugging rod 3.

Example five

In this embodiment, the same reference numerals are given to the same portions as those in the first to fourth embodiments, and the same description is omitted.

Referring to fig. 1, with respect to the first to fourth embodiments, the mechanical connector provided in this embodiment has such a different structural design:

referring to fig. 8, the plugging end 32 has a through hole 34, an included angle α is formed between an axis of the through hole 34 and an axis of the plugging rod 3, α is greater than 0 ° and less than or equal to 90 °, an plugging cavity of the second external sleeve 2 is filled with epoxy resin, and when the plugging end 32 is inserted into the plugging cavity, the epoxy resin is poured into the through hole 34. Specifically, in order to ensure the strength of the plugging rod 3, two through holes 34 are preferably formed along the central axis of the plugging rod 3, and when the mechanical connector pair is completed, after the epoxy resin is solidified, the epoxy resin is filled into the through holes 34 of the plugging rod 3, so that the plugging rod 3 and the second external sleeve 2 are connected to form an integral structure, and the connection strength and the reliability of the connection structural members are improved when the connection structural members bear axial drawing force or pressure.

Further, referring to fig. 9, at least one spiral groove 35 is formed in the outer peripheral wall of the rod body 33 between the external threaded connection end 31 and the insertion end 32 of the insertion rod 3, the locking assembly 4 has at least one groove, and when the insertion rod 3 is locked with the locking assembly 4, the groove is communicated with the spiral groove 35, so that the liquid curing agent filled in the spiral groove 35 can be filled in the spiral groove 35 and the groove, and the insertion rod 3 and the locking assembly 4 are bonded to form an integral structure after solidification, thereby avoiding the problem that the locking assembly 4 is axially displaced relative to the insertion rod 3 when bearing axial tension or pressure.

Embodiment six,

In this embodiment, the same parts as those in the first to fifth embodiments are given the same reference numerals, and the same description is omitted.

Referring to fig. 10, the present embodiment further provides a precast pile assembly, which includes at least two precast piles longitudinally butted in sequence by the mechanical connectors in the above embodiment; in two adjacent prefabrication, the end part of an upper prefabricated pile is provided with a first external sleeve 1 connected with a plug-in rod 3, and the end part of a lower prefabricated pile is provided with a second external sleeve 2 provided with a mounting and clamping component 4; wherein, the first fastening ring 5 is concave or flush with the end face of the precast pile.

The foregoing is merely a preferred embodiment of the present utility model, and the scope of the utility model is defined by the claims, and those skilled in the art should also consider the scope of the present utility model without departing from the spirit and scope of the utility model.

Claims (10)

1. A mechanical connector, comprising:

the first external sleeve;

the second external sleeve is internally provided with an inserting cavity;

the axial end of the inserting rod is provided with an external thread connecting end which is in threaded connection with the first external sleeve, and the other end of the inserting rod forms an inserting end which can extend into the inserting cavity;

the clamping component is arranged in the first external sleeve and used for locking the plug-in end; and

the first fastening ring is provided with an internal thread in threaded connection with the external thread connecting end and axially abuts against the first external sleeve.

2. A mechanical connector, comprising:

the first external sleeve;

the second external sleeve is internally provided with an inserting cavity;

the axial end of the inserting rod is provided with an external thread connecting end which is fixedly connected with the first external sleeve in a threaded manner, and the other end of the inserting rod forms an inserting end which can extend into the inserting cavity;

the clamping component is arranged in the first external sleeve and used for locking the plug-in end; and

the first fastening ring is provided with an external thread in threaded connection with the inner wall of the first external sleeve and axially abuts against the external thread connecting end of the plug rod, and a radial gap is formed between the first fastening ring and the rod body of the plug rod.

3. The mechanical connection according to claim 1 or 2, wherein the outer diameter of the first fastening ring is smaller than or equal to the outer diameter of the first circumscribing sleeve;

the second fastening ring is in threaded connection with the outer wall of the clamping assembly and axially abuts against the second external sleeve, or in threaded connection with the inner wall of the second external sleeve and axially abuts against the clamping assembly.

4. A mechanical connection according to claim 3, wherein a lock washer is provided between the first fastening ring and the first external sleeve or between the first fastening ring and the male threaded connection end of the plug rod, between the second fastening ring and the second external sleeve or between the second fastening ring and the locking assembly;

and/or the outer diameter of the second fastening ring is smaller than or equal to the outer diameter of the second external sleeve;

and/or the axial end part of the first fastening ring or the second fastening ring is provided with a screwing force application part.

5. The mechanical connector according to claim 1 or 2, wherein the locking assembly comprises a plurality of arc-shaped clamping blocks, an outer dental tube and an elastic supporting piece, wherein the arc-shaped clamping blocks, the outer dental tube and the elastic supporting piece are circumferentially arranged in a surrounding mode, the outer dental tube is in threaded connection with the second external sleeve and is abutted against the arc-shaped clamping blocks, the elastic supporting piece is arranged at the bottom of the insertion cavity and is abutted against the arc-shaped clamping blocks in the direction of the outer dental tube, a gasket is arranged between the elastic supporting piece and the arc-shaped clamping blocks, the insertion end is a reducing insertion head, a plurality of arc-shaped clamping blocks are surrounded to form an insertion channel for the reducing insertion head to be inserted, and the plurality of arc-shaped clamping blocks are reversely locked to the reducing insertion head;

the arc fixture block is split type structure, or arc fixture block bottom links to each other.

6. The mechanical connector of claim 5, wherein the outer tube is provided with a flange at an end thereof remote from the socket cavity, the flange abutting an end face of the second outer sleeve.

7. The mechanical connector according to claim 1 or 2, wherein the locking assembly comprises more than two wedge-shaped clamping pieces which are annularly arranged and distributed, an outer dental tube which is in threaded connection with the second external sleeve and is abutted against the wedge-shaped clamping pieces, and an elastic supporting piece which is arranged at the bottom of the insertion cavity and is abutted against the wedge-shaped clamping pieces towards the outer dental tube, the inner wall of the outer dental tube is provided with an inner cone blocking surface, the outer wall of each wedge-shaped clamping piece is provided with an outer inclined cone surface which is matched with the inner cone blocking surface, more than two wedge-shaped clamping pieces which are annularly arranged and distributed are enclosed to form an insertion passage for the insertion of the insertion end, and the outer hoop of each wedge-shaped clamping piece is provided with an elastic ring.

8. The mechanical connector according to claim 1 or 2, wherein the plug end is provided with a through hole, the axis of the through hole and the axis of the plug rod are provided with an included angle alpha, 0 degrees < alpha is less than or equal to 90 degrees, the plug cavity of the second outer sleeve is filled with epoxy resin, and when the plug end is inserted into the plug cavity, the epoxy resin is poured into the through hole.

9. The mechanical connector according to claim 1 or 2, wherein the plug rod is provided with at least one spiral groove in the outer peripheral wall of the rod body between the male threaded connection end and the plug end, and the locking assembly is provided with at least one groove, and the groove is communicated with the spiral groove when the locking assembly locks the plug rod.

10. A precast pile assembly comprising at least two precast piles sequentially longitudinally butted by the mechanical connector of any one of claims 1 to 9; in the two adjacent precast piles, the end part of the upper precast pile is provided with a first external sleeve connected with the inserting connection rod, and the end part of the lower precast pile is provided with a second external sleeve for installing the clamping component; wherein, first fastening intra-annular indent or flush is in precast pile terminal surface.

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