Prestressed reinforcement locking mechanism and concrete prefabricated part

Abstract

The utility model relates to a prestressed reinforcement locking mechanism and a precast concrete component, the prestressed reinforcement locking mechanism comprises a sleeve, the sleeve is internally provided with a taper hole and an inner threaded hole which are sequentially arranged from left to right and are axially through, and the periphery of the sleeve is provided with a sleeve external thread used for being in threaded connection with an end plate; the conical clamp is placed in the conical hole and is matched with the conical hole; the top cylinder is provided with an axial through hole, and the periphery of the top cylinder is provided with a top cylinder external thread; under the condition that the clamp is placed in the taper hole, the top cylinder is screwed into the inner threaded hole of the sleeve through the top cylinder outer thread, the inner end of the top cylinder can directly or indirectly abut against the right end face of the clamp, and the inner tooth hole of the clamp and the penetrating hole of the top cylinder are axially through so that the prestressed steel bars can sequentially penetrate through the inner tooth hole of the clamp and the penetrating hole of the top cylinder. The locking mechanism can greatly improve the position precision of the tapered clamp for locking the prestressed reinforcement. The utility model further relates to a precast concrete component.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete foundation engineering of various building structure systems, and in particular relates to a locking mechanism for prestressed steel bars used in prefabricated concrete components. The present invention also relates to a production method for concrete piles using the aforementioned prestressed steel bar locking mechanism, and concrete piles manufactured using the aforementioned method. Background Art

[0002] Due to the high tensile strength of prestressed steel (for example, the design tensile strength of steel strand is 1320 MPa, with a maximum tensile strength of 1960 MPa), Chinese companies and research institutions have conducted extensive research on the use of prestressed steel in precast concrete components in recent years. During the manufacturing process of these prestressed reinforced concrete components, conical clamps are typically used to secure the prestressed steel. The core technical considerations are how to conveniently and accurately connect and secure the prestressed steel to the conical clamps, and how to achieve maximum consistency in the tension applied to each prestressed steel bar.

[0003] For example, a Chinese invention patent with patent number ZL201410034851.8 (publication number CN103741672B) entitled "A pre-tensioned centrifugal concrete pile with steel strands and a manufacturing method" discloses a method of locking the steel strands: a conical hole is opened on the end plate, and a conical chuck assembly composed of multiple clips is placed in each conical hole. The steel strand passes through the inner tooth hole of the chuck assembly and is locked on the end plate. This locking method is simple, but during the installation process of the steel cage in the early stage of production (before the steel strand is tensioned), it is difficult to combine and fix the end of the steel strand with the tapered clamp assembly, and this combination will be very loose. It is often necessary to use a hammer to hammer the end of the steel strand and the clamp assembly into the tapered hole on the end plate to achieve a tight combination of the two and lock the steel strand on the end plate, which will cause direct misalignment of the clamp assembly and the steel strand. In addition, when the end of the steel strand is extended into the clamp assembly, it will also cause relative misalignment of the clamping pieces of the clamp assembly and irregular internal tooth holes, thereby reducing the internal tooth hole's fit for the steel strand. The clamping force of the steel strands is too low, and the position accuracy of the steel strands locked by the clamping assembly is not high, that is, the clamping and locking positions of the steel strands in the length direction of each clamping assembly are inconsistent and non-uniform, which makes the tension of each steel strand inconsistent, which seriously affects the mechanical properties of the pile body. In addition, after the pile body is formed, the prestress of the prestressed steel bar locking end plate is inconsistent, which also affects the mechanical properties of the pile body end. In addition, after the concrete pile is formed, the end of the steel strand is firmly locked in the conical clamping assembly under the action of prestress. Even if the tension of each steel strand is found to be inconsistent, it is difficult to make remedial corrections. Another example is the Chinese invention patent "Pre-tensioned Centrifugal Concrete Pile with Steel Strand and Manufacturing Method," with patent number ZL201410036904.X (publication number CN103758120B), which discloses another similar steel strand locking mechanism: an anchor ring has a stepped through hole, the large hole portion of which is a threaded hole, and the small hole portion of which is a tapered hole. A conical chuck assembly composed of multiple clips is placed in the tapered hole. The steel strand is locked in the internal tooth hole of the chuck assembly. The anchor ring is connected to the end plate via a bolt connector, with the threaded section of the bolt extending into the threaded hole in the large hole portion of the anchor ring. This locking method is similar to the first method described above, but also suffers from the difficulty of the tapered chuck assembly to lock with the end of the steel strand, the low accuracy of the locking position, and the inconsistent clamping and locking positions of the steel strands by each chuck assembly along the length direction, which affects the mechanical properties of the pile body and the pile end. Furthermore, it is difficult to take remedial measures to address the inconsistent tensioning force of the steel strands.

[0004] The invention application with publication number CN104343118A discloses a tensioning device for manufacturing concrete piles with steel strands, which has a plurality of first through-holes on the anchor plate, a first connecting seat being detachably fixed in the first through-hole, a first threaded through-hole on the first connecting seat, a first push rod being threadedly connected in the first threaded through-hole, the inner end of the first push rod being against the outer end face of the clip assembly, the steel strand being pushed flush with the outer end face of the clip assembly by the push rod, and the concrete pile after centrifugation has no end plate with the end of the steel strand exposed; there is also an invention application with publication number CN110499754A, which also discloses a steel strand clamping component and a corresponding concrete pile, which has an external thread on the outer wall of the anchor ring for direct connection with the end plate, an internal threaded hole being provided in the anchor ring for fixing the installation plug, and a conical chuck assembly being placed in the conical hole of the anchor ring to lock the steel strand on the end plate. These two inventions respectively use a push rod and a plug to abut against the ends of the chuck assembly and the steel strand, so as to achieve a uniform length of each steel strand inserted into each chuck assembly, and thereby achieve a consistent tension force on each steel strand. However, although the accuracy of the conical clamps of the two inventions in clamping and locking the steel strands is improved, in actual operation, there is always mutual friction and jamming between the two during the process of inserting the steel strand ends into the tooth holes in the chuck assembly. Not every steel strand end and chuck assembly uniformly abut against the push rod or the plug as expected by the invention. It often happens that some chuck assemblies or steel strand ends are jammed, resulting in different lengths of steel strand inserted into the chuck assembly. The chuck assembly will also cause the clips to be misaligned and deformed, reducing the clamping force on the steel strand. Moreover, in actual production, it is difficult to ensure that the cut length of each steel strand is uniform. Each steel strand will have more or less length differences, which also makes it difficult for the invention to actually achieve a consistent tension force on each steel strand. Therefore, these two inventions will also have the defects of the above two patents that the conical chuck assembly is difficult to combine and lock with the end of the steel strand, or the position accuracy of the conical chuck assembly in locking the steel bar is not high, and the tension of each steel strand is inconsistent. Moreover, because the top rod and the plug block the end of the steel strand, it is difficult to detect and correct the problem of inconsistent tension of the steel strand.

[0005] Another problem with the aforementioned prior art method for locking prestressed steel bars is that the ends of the prestressed steel bars no longer extend after being locked by the tapered clamp. Therefore, this prior art cannot be used for long-line production (i.e., the simultaneous production of two or more concrete piles in a single long mold) of concrete piles with end plates, limiting its scope of application. Furthermore, the end plate holes corresponding to the concrete pile strands in the aforementioned invention cannot be connected to other external components.

[0006] In summary, the locking mechanism of the prestressed steel bars in the aforementioned prior art needs to be further improved. Utility Model Content

[0007] The first technical problem to be solved by the present invention is to provide a locking mechanism for prestressed steel bars with a reasonable structure, which can easily enable a conical chuck assembly (clamp) to lock the prestressed steel bars of a prefabricated concrete component and can greatly improve the position accuracy of the conical clamp in locking the prestressed steel bars. The locking mechanism can also be used for manufacturing prestressed concrete components with end plates using the long-line method.

[0008] The technical solution adopted by the present invention to solve the first technical problem is: a locking mechanism for prestressed steel bars, characterized in that:

[0009] The sleeve comprises a conical hole and an internal threaded hole which are sequentially arranged from left to right and axially penetrate the sleeve, wherein the internal threaded hole is located on the right side of the conical hole, and the aperture of the conical hole gradually increases from left to right. The outer periphery of the sleeve has an external sleeve thread for threaded connection with the end plate;

[0010] A conical clamp can be placed in the conical hole and its outer circumference is adapted to the conical hole. The center of the clamp has an inner tooth hole for locking the prestressed steel bar, and the peripheral wall of the inner tooth hole has locking teeth;

[0011] The top tube has an axially extending through-hole and an outer circumference of the top tube provided with external threads for threaded connection with the internal threaded hole of the sleeve. When the clamp is placed in the tapered hole, the top tube is screwed into the internal threaded hole of the sleeve via the external threads, and the inner end of the top tube can directly or indirectly abut the right end face of the clamp. The internal tooth hole of the clamp and the through-hole of the top tube are axially connected to allow the prestressed steel bars to pass through in sequence. The clamp can be composed of two or more spliced ​​clips or a single, integral tapered clamp with elasticity.

[0012] Preferably, when the sleeve is threadedly connected to the end plate, the outer end of the sleeve is flush with or lower than the outer end surface of the end plate. The outer end of the sleeve does not protrude from the end plate, which does not affect pile driving and pile connection.

[0013] As an improvement, the sleeve is shaped like a stepped shaft, with external threads located on the outer periphery of the small shaft portion on the right side of the sleeve. The sleeve's shoulder abuts against the inner end surface of the end plate. This abutment serves as an installation indicator. When the sleeve is screwed into the end plate, the abutment indicates that the sleeve is properly installed, eliminating the need to observe whether the sleeve is exposed outside the end plate, making installation more user-friendly.

[0014] To facilitate screwing the ejector into the sleeve, the ejector has a connecting portion and a head. The connecting portion is a threaded column for connecting to the internal threaded hole, and the head is polygonal and has an outer diameter larger than that of the connecting portion. This makes it easier to use a wrench to screw the ejector into the internal threaded hole of the sleeve.

[0015] As a further improvement, the thread direction of the internal threaded hole on the sleeve is opposite to the thread direction of the external thread on the sleeve. In this way, when the top cylinder is screwed into place, the rotation of the top cylinder will not cause the sleeve to be screwed out of the threaded connection hole on the end plate.

[0016] Compared with the existing technology, the beneficial technical effects of this locking mechanism are:

[0017] 1. Because the top tube of the utility model has an axial through-hole, the end of the prestressed steel bar of the precast concrete component can pass through the through-hole of the top tube after passing through the tapered hole of the sleeve and can be fixed, tensioned and stabilized in advance. Thereafter, in the process of only placing the tapered clamp into the tapered hole of the sleeve, there is no need to consider the matching problem of the end of the prestressed steel bar. There is no possibility that the end of the prestressed steel bar will get stuck or interfere with the tapered clamp or cause the internal tooth hole to be dislocated and deformed. This avoids the problem of reduced clamping force caused by the end of the prestressed steel bar disturbing and dislocating the tapered clamp. There is no need to consider whether the length of the end of the prestressed steel bar deep into the tapered clamp is consistent. The prestressed steel bars can be pre-tensioned after passing through the holes in the top tube; when the prestressed steel bars have been fixed and tensioned in advance after passing through the holes in the top tube, the prestressed steel bars are stable and motionless, and the top tube can be gradually screwed into the internal threaded hole of the sleeve through the external thread of the top tube. The inner end of the top tube can be stably and gradually pressed against the conical clamp located in the conical hole of the sleeve. There is no interaction between the top tube and the end of the prestressed steel bar, and there is no sliding or loosening of the prestressed steel bar. Therefore, the conical clamp can synchronously sink gradually in the conical hole and gradually clamp the prestressed steel bars located in the tooth hole inside the clamp, so that the clamping position and clamping force of the conical clamp on each prestressed steel bar are always consistent. Therefore, the utility model can realize the locking of prestressed steel bars by the conical clamp in a convenient, standardized, controllable and reliable manner, and can greatly improve the accuracy of the conical clamp in locking the position of the prestressed steel bars, effectively solving the technical problems in the prior art that the conical clamp assembly is difficult to lock or the combination is loose and the clamp clamps the steel bars inconsistently, so that the tensioning force of each prestressed steel bar in the concrete component can be kept highly consistent, greatly improving the mechanical properties of the concrete component itself and the end, and precast concrete components with ultra-high mechanical properties can be produced based on this.

[0018] 2. Prestressed steel bars can be tensioned twice to correct the problem of inconsistent tensioning force of prestressed steel bars in concrete components that may exist, ensuring that the concrete components have high mechanical properties. Whether it is the length difference of each prestressed steel bar when it is initially cut to a fixed length, or the inconsistent tensioning force of each prestressed steel bar caused by other occasional reasons during the production process, it can be compensated and corrected based on the locking mechanism of the utility model. Specifically: during production, each prestressed steel bar is extended to the outside of the top tube through the perforation of the top tube, so that a jack can be used to clamp the outer steel bars and each steel bar is tensioned to a uniform tension one by one and then released. The conical clamp automatically locks the steel bar, or, after the pile body is formed, each steel bar extending to the outside of the end plate is tensioned to a uniform tension by a jack. Therefore, the locking mechanism of the utility model can finally adjust the tensioning force of each prestressed steel bar to be consistent, thereby ensuring the mechanical properties of the concrete component itself and the end.

[0019] 3. After the concrete component is formed, the top tube of the utility model can be unscrewed from the sleeve for reuse, and the internal threaded hole of the empty sleeve can be used as a connecting hole to connect with other components. It can be used for mechanical pile connection or connection with tensioning plates and anchor plates, without the need to set additional threaded connection holes on the end plate for mechanical pile connection or connection. Under the premise of a certain area of ​​the end plate, as many prestressed steel bars as possible can be arranged, providing the possibility for high-density reinforcement of concrete components.

[0020] 4. The top tube of the utility model has an axial through-hole, and the same prestressed steel bar can continuously pass through the top tubes on multiple end plates without affecting the top tube from tightening the conical clamp into the conical hole of the end plate, thereby conveniently and securely locking the conical clamp to the prestressed steel bar, providing the possibility of producing concrete components with end plates by the long-line method (two or more concrete components can be produced in the same long mold).

[0021] The above-mentioned locking mechanism can be generally used to lock prestressed steel bars in various types of precast concrete components, including centrifugal concrete round piles, square piles, special-shaped piles, vibration-formed square piles, H-shaped piles, and special-shaped piles. It can also be used to lock prestressed steel bars in bridge concrete components, and has a wide range of application scenarios.

[0022] The second technical problem to be solved by the present invention is to provide a concrete pile with a reasonable structure, convenient mechanical pile connection, better mechanical properties such as bending and shearing resistance, and increased reinforcement density in response to the above-mentioned deficiencies in the existing technology.

[0023] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is as follows: a concrete pile includes a pile body, a prestressed steel bar in the pile body, and an end plate at the end of the pile body, characterized in that: it also includes a sleeve, the sleeve has a tapered hole and an internal threaded hole arranged axially in sequence from left to right, the internal threaded hole is located on the right side of the tapered hole, the diameter of the tapered hole gradually increases from left to right, the outer periphery of the sleeve has a sleeve external thread, and the sleeve is threadedly connected to the end plate via the sleeve external thread; a tapered clamp is located in the tapered hole and its outer peripheral surface is adapted to the tapered hole, the center of the clamp has an internal toothed hole, the peripheral wall of the internal toothed hole has locking teeth, and the prestressed steel bar is locked by the internal toothed hole; the end of the prestressed steel bar is accommodated in the internal threaded hole of the sleeve, and an annular space is formed between the prestressed steel bar and the inner wall of the internal threaded hole, the right end of the internal threaded hole is open, the internal threaded hole can be used for threaded connection with other components or the annular space can be filled with sealing material.

[0024] The pile body is centrifugally formed or vibrationally formed, and the cross section of the pile body is circular, square, H-shaped or special-shaped.

[0025] The end plate is also provided with threaded holes that can be used to connect other components.

[0026] The sealing material filled in the annular space can be epoxy resin or concrete.

[0027] Compared with the existing technology, the advantages of this precast concrete component are: the concrete pile of the utility model is produced by adopting the above-mentioned locking mechanism, and the end of the prestressed steel bar is accommodated in the internal threaded hole of the sleeve, so that the tensioning force of each prestressed steel bar in the pile body is consistent, and the locking force of each prestressed steel bar locking the end plate is consistent, so that the bending, shear and pull-out resistance of the pile body and the pile end of the concrete pile are better; an annular space is formed between the prestressed steel bar and the inner wall of the internal threaded hole, and the right end of the internal threaded hole is open, so that it can be used for mechanical pile connection or connection with other components. At the same time, when the internal threaded hole of the sleeve also serves as a connection hole for mechanical pile connection or connection with other components, there is no need to provide another connection hole on the end plate, so that the distribution density of the prestressed steel bars can be increased on the limited end plate area to produce concrete piles with higher mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional view of an embodiment of a locking mechanism;

[0029] Figure 2 is a three-dimensional schematic diagram of a sleeve in an embodiment of a locking mechanism;

[0030] Figure 3 is a cross-sectional view of a sleeve in an embodiment of a locking mechanism;

[0031] Figure 4It is a three-dimensional schematic diagram of the top cylinder in the locking mechanism embodiment;

[0032] Figure 5 is a cross-sectional view of the top cylinder in the locking mechanism embodiment;

[0033] Figure 6 A schematic diagram of the three-dimensional structure of the clamp in the locking mechanism embodiment;

[0034] Figure 7 is a three-dimensional exploded view of the clamp in the locking mechanism embodiment;

[0035] Figure 8 A three-dimensional schematic diagram of an embodiment of a precast concrete component

[0036] Figure 9 It is a partial cross-sectional view of an embodiment of a precast concrete component. DETAILED DESCRIPTION

[0037] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0038] like Figures 1 to 7 FIG. 1 shows a preferred embodiment of a locking mechanism for prestressed steel bars of a precast concrete component.

[0039] A locking mechanism for prestressed steel bars, wherein the precast concrete component can be a concrete pile or a concrete slab, and the prestressed steel bars 2 can be steel strands or steel bars, etc.

[0040] Sleeve 1 has a tapered hole 1a and an internally threaded hole 1b disposed axially therein, arranged from left to right. The internally threaded hole 1b is located to the right of the tapered hole 1a, and the diameter of the tapered hole 1a gradually increases from left to right. The outer periphery of sleeve 1 has external sleeve threads 1c for threaded connection with end plate 3. The direction of rotation of internally threaded hole 1b on sleeve 1 is opposite to the direction of rotation of external sleeve threads 1c on sleeve 1.

[0041] The conical clamp 5 can be placed in the tapered hole 1a, and its outer circumference is adapted to the tapered hole 1a. The center of the clamp 5 has an inner tooth hole 51 for locking the prestressed steel bar 2. The peripheral wall of the inner tooth hole 51 has locking teeth 52. The clamp 5 is formed by splicing two or three pieces. The outer circumference of the clamp 5 forms a conical surface 53 that matches the tapered hole 1a.

[0042] The top tube 6 has an axially extending through-hole 6a, and the outer circumference of the top tube 6 is provided with a top tube external thread 6b for threaded connection with the internal threaded hole 1b of the sleeve 1. When the clamp 5 is placed in the tapered hole 1a, the top tube external thread 6b is connected to the internal threaded hole 1b of the sleeve 1, and the inner end of the top tube 6 can directly or indirectly abut the right end surface of the clamp 5. The internal tooth hole 51 of the clamp 5 and the through-hole 6a of the top tube 6 are axially connected to allow the prestressed steel bar 2 to pass through in sequence. The top tube 6 has a connecting portion 61 and a head 62. The connecting portion 61 is a threaded column portion for connecting to the internal threaded hole 1b. The head 62 is a polygonal shape that is convenient for mating with a wrench, and the outer diameter of the head 62 is larger than the outer diameter of the connecting portion 61.

[0043] When the sleeve 1 is threadedly connected to the end plate 3, the outer end of the sleeve 1 is flush with or lower than the outer end surface of the end plate 3. The sleeve 1 in this embodiment is in the shape of a stepped shaft, with the sleeve external thread 1c arranged on the outer periphery of the small shaft portion on the right side of the sleeve 1, and the shoulder 11 of the sleeve 1 abuts against the inner end surface of the end plate 3.

[0044] This locking mechanism is used to lock the straightened prestressed steel bar 2 on the end plate. Specifically, each sleeve 1 is first connected to the end plate 3 through the sleeve external thread 1c, and one end of each prestressed steel bar 2 is passed through the tapered hole 1a, the internal threaded hole 1b and the through hole 6a of the top tube 6 of the corresponding sleeve 1 on each end plate 3. The two ends of each prestressed steel bar 2 are fixed, and then the prestressed steel bar is tensioned. It can be tensioned to about 25% of the tensile strength of the prestressed steel bar, or the prestressed steel bar can be tensioned to the design value at one time; the clamp 5 is connected in series to the prestressed steel bar 2 and installed in the tapered hole 1a of the sleeve 1, the top tube 6 is screwed into the internal threaded hole 1b of the sleeve 1, the top tube 6 is tightened and the clamp 5 is gradually tightened in the tapered hole 1a of the sleeve 1, so that the clamp 5 can tightly fix and lock the prestressed steel bar 2. The locking mechanism of the utility model can make it easy for the conical clamp to lock the prestressed steel bar, and the locking mechanism can realize standardized operation in production, is not easily affected by human or other factors, and can greatly improve the accuracy of the conical clamp in locking the prestressed steel bar position, effectively solving the technical problems in the prior art that the conical clamp assembly is difficult to lock or the combination is loose and the clamp holds the steel bar inconsistently, so that the tensioning force of each prestressed steel bar in the concrete component can be kept highly consistent, which greatly improves the mechanical properties of the concrete component itself and the end portion, and can produce precast concrete components with ultra-high mechanical properties based on this, ensuring product quality and performance.

[0045] The left and right directions in this application are based on Figure 1 The directions shown are references and are introduced to facilitate the description of the relative positional relationships of various parts and structures. They do not limit the directions of various parts and components to be fixed. The visual directions may be different in multiple perspectives and scenes, but their relative positional relationships are certain.

[0046] like Figures 8-9 FIG. 1 shows an embodiment of a precast concrete component.

[0047] It includes a pile body 4, prestressed steel bars 2 inside the pile body 4 and an end plate 3 at the end of the pile body 4.

[0048] The sleeve 1 has a tapered hole 1a and an internal threaded hole 1b arranged axially in sequence from left to right. The internal threaded hole 1b is located on the right side of the tapered hole 1a. The aperture of the tapered hole 1a gradually increases from left to right. The outer periphery of the sleeve 1 has a sleeve external thread 1c. The sleeve 1 is threadedly connected to the end plate 3 through the sleeve external thread 1c.

[0049] The conical clamp 5 is located in the conical hole 1a and its outer peripheral surface is adapted to the conical hole 1a. The center of the clamp 5 has an inner tooth hole 51, and the peripheral wall of the inner tooth hole 51 has locking teeth 52. The prestressed steel bar 2 is locked by the inner tooth hole 51.

[0050] The end of the prestressed steel bar 2 is accommodated in the internal threaded hole 1b of the sleeve 1, and an annular space Q is formed between the prestressed steel bar 2 and the inner wall of the internal threaded hole 1b. The internal threaded hole 1b can be used for threaded connection with other components, and sealing material can also be filled in the annular space Q to seal the end of the steel bar.

[0051] The pile body 4 is formed by centrifugal molding or vibration molding, and the cross section of the pile body 4 is circular, square, H-shaped or special-shaped. The end plate 3 can also be provided with threaded holes that can be used to connect other components.

[0052] The sealing material can be epoxy resin or concrete.

[0053] It should be noted that in the description of this embodiment, the terms "front, back", "left, right", "inside, outside", "upper, lower" and the like indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A prestressed steel bar locking mechanism, characterized in that: include A sleeve (1), wherein the sleeve (1) has a tapered hole (1a) and an internal threaded hole (1b) arranged in sequence from left to right and axially extending therethrough, the internal threaded hole (1b) being located on the right side of the tapered hole (1a), the aperture of the tapered hole (1a) gradually increasing from left to right, and the outer periphery of the sleeve (1) having a sleeve external thread (1c) for threaded connection with the end plate (3); A conical clamp (5) can be placed in the conical hole (1a) and its outer peripheral surface is adapted to the conical hole (1a). The center of the clamp (5) has an inner tooth hole (51) for locking the prestressed steel bar (2), and the peripheral wall of the inner tooth hole (51) has locking teeth (52); A top tube (6), the top tube (6) has an axially through-hole (6a), and the outer periphery of the top tube (6) is provided with a top tube external thread (6b) for threaded connection with the internal threaded hole (1b) of the sleeve (1); when the clamp (5) is placed in the tapered hole (1a), the top tube is screwed into the internal threaded hole (1b) of the sleeve (1) through the top tube external thread (6b) and the inner end of the top tube (6) can directly or indirectly abut against the right end face of the clamp (5), and the inner tooth hole (51) of the clamp (5) and the through-hole (6a) of the top tube (6) are axially through-hole to allow the prestressed steel bars (2) to pass through in sequence.

2. The locking mechanism according to claim 1, wherein: When the sleeve (1) is threadedly connected to the end plate (3), the right end of the sleeve (1) is flush with or lower than the outer end surface of the end plate (3).

3. The locking mechanism according to claim 2, wherein: The sleeve (1) is in the shape of a stepped shaft, and the sleeve external thread (1c) is arranged on the outer periphery of the small shaft portion on the right side of the sleeve (1). The shoulder (11) of the sleeve (1) abuts against the inner end surface of the end plate (3).

4. The locking mechanism according to claim 1, wherein: The top cylinder (6) has a connecting portion (61) and a head portion (62). The connecting portion (61) is a threaded column portion for connecting to the internal threaded hole (1b). The head portion (62) is polygonal and has an outer diameter greater than that of the connecting portion.

5. The locking mechanism according to claim 1, wherein: The thread rotation direction of the internal threaded hole (1b) on the sleeve (1) is opposite to the thread rotation direction of the sleeve external thread (1c) on the sleeve (1).

6. A prefabricated concrete component comprising a pile body (4), prestressed steel bars (2) in the pile body (4) and an end plate (3) at the end of the pile body (4), characterized in that: Also includes A sleeve (1), wherein the sleeve (1) has a tapered hole (1a) and an internal threaded hole (1b) arranged axially in sequence from left to right, the internal threaded hole (1b) is located on the right side of the tapered hole (1a), and the aperture of the tapered hole (1a) gradually increases from left to right. The outer periphery of the sleeve (1) has a sleeve external thread (1c), and the sleeve (1) is threadedly connected to the end plate (3) via the sleeve external thread (1c); A conical clamp (5) is located in the conical hole (1a) and its outer peripheral surface is adapted to the conical hole (1a). The center of the clamp (5) has an inner tooth hole (51), and the peripheral wall of the inner tooth hole (51) has locking teeth (52). The prestressed steel bar (2) is locked by the inner tooth hole (51); The end of the prestressed steel bar (2) is accommodated in the internal threaded hole (1b) of the sleeve (1), and an annular space (Q) is formed between the prestressed steel bar (2) and the inner wall of the internal threaded hole (1b). The right end of the internal threaded hole (1b) is open. The internal threaded hole (1b) can be used for threaded connection with other components or the annular space (Q) can be filled with sealing material.

7. The precast concrete component according to claim 6, characterized in that: The pile body (4) is centrifugally formed or vibrationally formed, and the cross section of the pile body (4) is circular, square, H-shaped or special-shaped.

8. The precast concrete component according to claim 6, characterized in that: The end plate (3) is further provided with threaded holes that can be used to connect other components.

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