Variable-diameter concrete precast pile mold

Abstract

The utility model discloses a diameter-variable concrete precast pile mould, which comprises an upper mould, a lower mould and a lining template assembly, the upper mould and the lower mould are spliced to form a closed pouring cavity, the lining template assembly is arranged in the pouring cavity in a complete set mode, the lining template assembly comprises an upper lining template and a lower lining template which are the same in structure, the lining template assembly forms a diameter-variable pouring cavity, and the upper lining template and the lower lining template are arranged in the pouring cavity. The upper die and the lower die are respectively provided with a connecting hole, the outer wall of the lining template assembly is provided with a lining template connecting part which is coaxial with the connecting hole, and the upper die and the lower die are respectively and detachably connected with the lining template assembly through the lining template connecting part. By arranging the lining template connecting part, the repeated utilization rate is improved, the surface quality requirement is met, the diameter of the mold can be rapidly changed according to the diameter of the precast pile, the mold transformation time is shortened, the product production efficiency is improved, and the mold diameter changing difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to a variable diameter concrete prefabricated pile mould, belonging to the technical field of concrete moulds. Background Art

[0002] At present, the production of concrete prestressed pile components is mainly divided into round piles and square piles. In order to produce this product, molds with corresponding structures are used. At the same time, in order to adapt to market demand, prefabricated piles have developed many variable-diameter pile products based on round pile and square pile structures in recent years. The usual practice for this type of mold is to modify the round pile mold or the square pile mold, and add a template with corresponding modeling structure in the mold cavity. The modification method is achieved by welding the integral steel plate to the tube mold template.

[0003] The patent with announcement number CN 219563550 U discloses a rigid-flexible joint concrete precast pile mold, in which the inner mold and the outer mold are connected and fixed by a semi-annular support structure, and the semi-annular support structure is a rigid semi-annular liner, which is connected to the outer mold by welding or bolts, and is connected to the inner mold by welding. The above connection method solves the problem that the pile body is easily damaged by the protrusion. If the welding method is used, after the production of the current product is completed, the inner mold is disassembled, and the surface of the original welding part will be uneven, affecting the quality of other products produced by the outer mold. If the surface treatment is performed on this part, the preparation efficiency of the product will be reduced; if the bolt connection method is used, it will loosen due to the shaking generated during pouring, and the shear force will damage the bolts, which will also cause loosening, thereby affecting the product quality and production efficiency.

[0004] The patent with announcement number CN 217196065 U discloses a multifunctional mold for concrete pipe piles, in which the inner mold and the outer mold are connected by bolts, a countersunk hole is provided in the inner mold, a connecting hole corresponding to the position of the countersunk hole is provided in the outer mold, a nut corresponding to the position of the connecting hole is welded to the outer wall of the outer mold, and a threaded hole corresponding to the position of the countersunk hole is provided in the outer mold. Since the inner mold is generally a thinner plate, if screws are used for connection, the plate near the countersunk hole is easily deformed to form a pit, which not only affects the reuse rate of the inner mold, but also makes the product quality substandard and reduces the yield rate; and the inner mold needs to be repeatedly opened and filled when it is reused, which affects the strength and surface quality of the inner mold, and further affects the surface quality of the prepared product, and repeated opening and filling will also affect the service life of the inner mold. Summary of the invention

[0005] Purpose of the invention: In order to solve the above-mentioned technical problems, the utility model provides a variable diameter concrete precast pile mold, which has a connecting hole on the casting cavity, and a lining formwork connecting part coaxial with the connecting hole is provided on the lining formwork assembly, and the upper mold and the lower mold are detachably connected to the upper lining formwork and the lower lining formwork respectively through the lining formwork connecting part, so as to ensure the strength of the inner mold while achieving the purpose of variable diameter production.

[0006] Technical solution: A variable diameter concrete precast pile mold, including an upper mold, a lower mold and a lining template assembly, the upper mold and the lower mold are spliced ​​to form a closed casting cavity, the lining template assembly is set in the casting cavity, the lining template assembly includes an upper lining template and a lower lining template with the same structure, the upper lining template is connected to the inner wall of the upper mold, the lower lining template is connected to the inner wall of the lower mold, the upper lining template and the lower lining template are spliced ​​to form a variable diameter casting cavity,

[0007] The upper mold and the lower mold are respectively provided with connecting holes, and the outer walls of the upper lining template and the lower lining template are provided with lining template connecting parts coaxial with the connecting holes, and the upper mold and the lower mold are respectively detachably connected with the upper lining template and the lower lining template through the lining template connecting parts.

[0008] The utility model provides a lining formwork connecting part on the outer wall thereof to be connected with the upper mold and the lower mold without destroying the structure of the upper lining formwork and the lower lining formwork. When the upper lining formwork and the lower lining formwork are reused, there is no need to repeatedly open holes and fill the structure of the upper lining formwork and the lower lining formwork themselves, which not only ensures the strength of the lining formwork assembly itself, but also ensures the process requirements of the inner surface of the variable diameter casting cavity. At the same time, only by welding the lining formwork connecting part on the surface of the upper lining formwork and the lower lining formwork, the diameter of the mold can be changed more quickly according to the diameter of the precast pile, thereby accelerating the modification time of the mold and the product production efficiency, and reducing the difficulty of changing the diameter of the mold.

[0009] Preferably, in order to improve the reliability and tightness of the connection between the lining formwork assembly and the casting cavity, the outer walls of the upper lining formwork and the lower lining formwork are respectively provided with rib plates; the height of the lining formwork connection portion is less than the height of the rib plates.

[0010] Since the rib plate must fit closely with the inner wall of the casting cavity to ensure its strength, if the height of the lining formwork connection part is higher than the height of the rib plate, the lining formwork assembly is connected to the upper mold and the lower mold only by the lining formwork connection part, and the rib plate cannot fit closely with the inner wall of the casting cavity. During casting, the lining formwork connection part is directly subjected to force and is prone to breakage and damage to the mold, which reduces the connection reliability and tightness, and also reduces the yield rate.

[0011] Preferably, in order to further improve the reliability of the connection between the lining formwork assembly and the casting cavity, it also includes a positioning bolt, which is connected to the lining formwork connecting part through a connecting hole, and the lining formwork connecting part includes a first threaded hole, and the positioning bolt is installed in the first threaded hole.

[0012] The connection between the positioning bolt and the lining template is set as a threaded connection. The threaded connection method is convenient for disassembly and replacement, and has higher sealing and reliability.

[0013] Preferably, in order to protect the positioning threaded portion, the positioning bolt comprises a nut, a first limiting shaft and a positioning threaded portion in sequence, the diameter of the first limiting shaft is larger than the diameter of the positioning threaded portion; the lining template connecting portion also comprises a first limiting hole that passes through the first threaded hole, the first limiting shaft is installed in the first limiting hole, and the positioning threaded portion is threadedly connected to the first threaded hole.

[0014] Providing the first limiting axis and the first limiting hole can further reduce the shear force on the positioning threaded portion due to shaking during pouring, prevent loosening due to damage to the thread, avoid the increase in time and material costs caused by repeated replacement of positioning bolts due to damage to the positioning bolts, and at the same time improve the efficiency of product manufacturing.

[0015] Preferably, in order to improve the connection reliability, it also includes an outer mold connecting block, which is arranged at the positions of the corresponding connecting holes of the upper mold and the lower mold; a second threaded hole and a second limiting hole that passes through the second threaded hole are arranged on the outer mold connecting block; the positioning bolt also includes a third limiting shaft, and the third limiting shaft is installed in the second limiting hole; the embedded end of the outer mold connecting block does not exceed the inner wall of the casting cavity.

[0016] Since the upper mold and the lower mold are curved molds, the positioning bolts are directly assembled with the upper mold and the lower mold, which is easy to form a gap. During pouring, the positioning bolts will become loose due to the pouring shaking and then damaged. Therefore, an outer mold connecting block is provided to contact and install with the positioning bolts so that the contact surface of the two is flat, which can further improve the reliability of the connection and protect the positioning bolts.

[0017] A preferred option, in order to seal the connecting holes between the upper mold and the lower mold, includes an outer mold connecting block, which is arranged at the positions of the corresponding connecting holes of the upper mold and the lower mold; a second threaded hole and a second limiting hole that passes through the second threaded hole are arranged on the outer mold connecting block; a sealing bolt is installed in the second threaded hole; and the embedded end of the outer mold connecting block does not exceed the inner wall of the casting cavity.

[0018] After completing the preparation of the precast piles, the lining formwork assembly is separated and removed from the upper and lower molds, and the connecting holes are sealed and restored using sealing bolts and outer mold connecting blocks, so that the restored upper and lower molds still meet the quality requirements for producing other products; the embedded end of the outer mold connecting block does not exceed the inner wall of the casting cavity in order to prevent interference between the outer mold connecting block and the inner lining formwork connection and reduce the tightness of the connection.

[0019] Preferably, in order to improve the reliability and sealing tightness of the connection between the sealing bolt and the outer mold connecting block, the sealing bolt comprises a nut, a sealing threaded portion and a second limiting shaft in sequence, and the diameter of the second limiting shaft is smaller than the diameter of the sealing threaded portion; the outer mold connecting block also comprises a second limiting hole that passes through the second threaded hole, the second limiting shaft is installed in the second limiting hole, and the sealing threaded portion is threadedly connected to the second threaded hole.

[0020] Connecting the sealing bolt and the outer mold connecting block through threads and installing the second limiting shaft in the second limiting hole can better protect the sealing bolt part, reduce the shear force it receives, prevent it from loosening, and improve the reliability of its connection and the tightness of the sealing.

[0021] Preferably, in order to improve the strength of the upper lining formwork and the lower lining formwork, the ribs of the outer walls of the upper lining formwork and the lower lining formwork respectively include lining annular ribs and lining axial ribs, and the height of the lining formwork connection portion is smaller than the highest rib among the lining annular ribs and the lining axial ribs.

[0022] The inner liner annular ribs and the inner liner axial ribs are arranged so that the loads on the two are evenly distributed, which can improve the seismic resistance and crack resistance of the inner liner formwork assembly and improve the strength of the upper inner liner formwork and the lower inner liner formwork.

[0023] Preferably, in order to facilitate the installation of the liner annular ribs, the radial ends of the liner template body are respectively provided with liner axial tongue and groove plates. Providing the liner axial tongue and groove plates can provide an installation reference when installing the liner annular ribs, thereby improving the convenience of installation.

[0024] Preferably, in order to improve the yield rate, the upper lining template includes a lining template body and an annular inclined plate, one end of the annular inclined plate is connected to the lining template body, and the other end is in close contact with the inner wall of the upper mold. The annular inclined plate is arranged on the upper lining template, which can make the product easy to demould, and is not easy to produce cracks and defects, thereby ensuring the yield rate.

[0025] Beneficial effects: The utility model arranges an inner lining formwork connecting portion coaxial with the connecting hole on the outer wall of the inner lining formwork assembly, thereby avoiding repeated drilling and filling of the inner lining formwork assembly, which causes its deformation and strength reduction, improves its reuse rate, and ensures the surface quality requirements of the inner wall of the variable diameter casting cavity, avoids irreversible processing and increases the cost of re-purchasing, and can quickly change the diameter of the mold according to the diameter of the precast pile, speeding up the mold modification time and product production efficiency, and reducing the difficulty of mold diameter change. The inner lining formwork assembly is arranged as a set, and pile bodies of different diameters on precast piles can be prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 This is the overall structure diagram;

[0028] Figure 2 This is the structural diagram of the lining formwork assembly;

[0029] Figure 3 This is the assembly drawing of the positioning bolts;

[0030] Figure 4 This is the structural diagram of the positioning bolt;

[0031] Figure 5 It is the assembly drawing of the positioning bolt, the connection part of the inner lining formwork and the outer formwork connection block;

[0032] Figure 6 Assembly structure drawing for outer mold connection block and plugging bolts;

[0033] Figure 7 This is the structural diagram of the sealing bolt. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] like Figure 1 and Figure 2 As shown, a variable diameter concrete precast pile mold includes an upper mold 1, a lower mold 2 and a lining template assembly 3. The upper mold 1 and the lower mold 2 are spliced ​​to form a closed casting cavity. The lining template assembly 3 is set in the casting cavity as a set. The lining template assembly 3 includes an upper lining template 31 and a lower lining template 32 with the same structure. The upper lining template 31 is connected to the inner wall of the upper mold 1, and the lower lining template 32 is connected to the inner wall of the lower mold 2. The upper lining template 31 and the lower lining template 32 are spliced ​​to form a variable diameter casting cavity.

[0038] The upper mold 1 and the lower mold 2 are respectively provided with connecting holes 4, and the outer walls of the upper lining template 31 and the lower lining template 32 are provided with lining template connecting parts 5 coaxial with the connecting holes 4, and the upper mold 1 and the lower mold 2 are respectively detachably connected to the upper lining template 31 and the lower lining template 32 through the lining template connecting parts 5.

[0039] Without destroying the structure of the upper lining formwork 31 and the lower lining formwork 32, a lining formwork connecting part 5 is set on the outer wall thereof to connect with the upper mold 1 and the lower mold 2. When reused, there is no need to repeatedly drill holes and fill the structure of the upper lining formwork 31 and the lower lining formwork 32 itself, which not only ensures the strength of the lining formwork assembly 3 itself, but also ensures the process requirements of the inner surface of the variable diameter casting cavity. At the same time, only by welding the lining formwork connecting part 5 on the surface of the upper lining formwork 31 and the lower lining formwork 32, the diameter of the mold can be changed more quickly according to the diameter of the precast pile, thereby accelerating the mold modification time and product production efficiency, and reducing the difficulty of mold diameter change.

[0040] like Figure 2 As shown, in order to improve the reliability and tightness of the connection between the lining formwork assembly 3 and the casting cavity, the outer walls of the upper lining formwork 31 and the lower lining formwork 32 are respectively provided with rib plates 6; the height of the lining formwork connection part 5 is less than the height of the rib plates 6.

[0041] Since the rib plate 6 needs to fit closely with the inner wall of the casting cavity to ensure its strength, if the height of the lining formwork connection part 5 is higher than the height of the rib plate 6, the lining formwork assembly 3 and the upper mold 1 and the lower mold 2 are only connected by the lining formwork connection part 5, and the rib plate 6 cannot fit closely with the inner wall of the casting cavity. During casting, the lining formwork connection part 5 is directly subjected to force and is prone to breakage and damage to the mold, thereby reducing the connection reliability and tightness, and also reducing the yield rate.

[0042] like Figure 3 As shown, in order to further improve the reliability of the connection between the lining formwork assembly 3 and the casting cavity, a positioning bolt 7 is also included, and the positioning bolt 7 is connected to the lining formwork connecting part 5 through the connecting hole 4. The lining formwork connecting part 5 includes a first threaded hole 51, and the positioning bolt 7 is installed in the first threaded hole 51. The positioning bolt 7 and the lining formwork connecting part 5 are arranged to be threadedly connected. The threaded connection method is convenient for disassembly and replacement, and has higher sealing performance and reliability.

[0043] like Figure 3 and Figure 4 As shown, in order to protect the positioning threaded portion 72, the positioning bolt 7 includes a nut, a first limiting shaft 71 and a positioning threaded portion 72 in sequence, wherein the diameter of the first limiting shaft 71 is larger than the diameter of the positioning threaded portion 72; the lining template connecting portion 5 also includes a first limiting hole 52 that penetrates the first threaded hole 51, the first limiting shaft 71 is installed in the first limiting hole 52, and the positioning threaded portion 72 is threadedly connected to the first threaded hole 51. The first limiting shaft 71 and the first limiting hole 52 can further reduce the shear force on the positioning threaded portion 72 due to shaking during pouring, prevent loosening due to damage to the thread, avoid the increase in time cost and material cost caused by repeated replacement of the positioning bolt 7 due to damage to the positioning bolt 7, and improve the efficiency of product manufacturing.

[0044] like Figure 5 As shown, in order to improve the connection reliability, it also includes an outer mold connecting block 81, and the outer mold connecting block 81 is arranged at the position corresponding to the connecting hole 4 of the upper mold 1 and the lower mold 2; a second threaded hole 811 and a second limiting hole 812 that passes through the second threaded hole 811 are arranged on the outer mold connecting block 81; the positioning bolt 7 also includes a third limiting shaft 73, and the third limiting shaft 73 is installed in the second limiting hole 812; the embedded end of the outer mold connecting block 81 does not exceed the inner wall of the casting cavity.

[0045] Since the upper mold 1 and the lower mold 2 are curved molds, the positioning bolts 7 are directly assembled with the upper mold 1 and the lower mold 2, which is easy to form a gap. During pouring, the positioning bolts 7 may become loose due to the pouring shaking and then damaged. Therefore, an outer mold connecting block 81 is provided to contact and install with the positioning bolts 7 so that the contact surface of the two is flat, which can further improve the reliability of the connection and protect the positioning bolts 7.

[0046] like Figure 6 As shown, in order to seal the connecting hole 4 between the upper mold 1 and the lower mold 2, an outer mold connecting block 81 is included, and the outer mold connecting block 81 is arranged at the position corresponding to the connecting hole 4 of the upper mold 1 and the lower mold 2; a second threaded hole 811 and a second limiting hole 812 that passes through the second threaded hole 811 are arranged on the outer mold connecting block 81; a sealing bolt 82 is installed in the second threaded hole 811; and the embedded end of the outer mold connecting block 81 does not exceed the inner wall of the casting cavity.

[0047] After completing the preparation of the precast piles, the lining formwork assembly 3 is separated and removed from the upper mold 1 and the lower mold 2, and the connecting hole 4 is sealed and restored using the sealing bolts 82 and the outer mold connecting block 81, so that the restored upper mold 1 and the lower mold 2 still meet the quality requirements for producing other products; the embedded end of the outer mold connecting block 81 does not exceed the inner wall of the casting cavity, in order to prevent the outer mold connecting block 81 from interfering with the lining formwork connection part 5 and reducing the tightness of the connection.

[0048] like Figure 6 and Figure 7 As shown, in order to improve the reliability and sealing tightness of the connection between the sealing bolt 82 and the outer mold connecting block 81, the sealing bolt 82 includes a nut, a sealing threaded portion 821 and a second limiting shaft 822 in sequence, and the diameter of the second limiting shaft 822 is smaller than the diameter of the sealing threaded portion 821; the outer mold connecting block 81 also includes a second limiting hole 812 that passes through the second threaded hole 811, the second limiting shaft 822 is installed in the second limiting hole 812, and the sealing threaded portion 821 is threadedly connected to the second threaded hole 811.

[0049] The sealing bolt 82 and the outer mold connecting block 81 are connected by threads, and the second limiting shaft 822 is installed in the second limiting hole 812. This can better protect the sealing bolt 82, reduce the shear force it receives, prevent it from loosening, and improve the reliability of its connection and the tightness of the sealing.

[0050] like Figure 2 As shown, in order to improve the strength of the upper lining formwork 31 and the lower lining formwork 32, the ribs 6 of the outer walls of the upper lining formwork 31 and the lower lining formwork 32 respectively include lining annular ribs 61 and lining axial ribs 62, and the height of the lining formwork connection portion 5 is less than the highest rib of the lining annular ribs 61 and the lining axial ribs 62. The lining annular ribs 61 and the lining axial ribs 62 are provided so that the loads on the two are evenly distributed, which can improve the seismic resistance and crack resistance of the lining formwork assembly 3, and improve the strength of the upper lining formwork 31 and the lower lining formwork 32.

[0051] In order to facilitate the installation of the liner annular rib plate 61, the radial ends of the liner template body 311 are respectively provided with liner axial tongue and groove plates 9. The liner axial tongue and groove plates 9 can provide an installation reference when installing the liner annular rib plate 61, thereby improving the convenience of installation.

[0052] In order to improve the yield rate, the upper lining template 31 includes a lining template body 311 and an annular inclined plate 312, one end of the annular inclined plate 312 is connected to the lining template body 311, and the other end is in close contact with the inner wall of the upper mold 1. The annular inclined plate 312 is arranged on the upper lining template 31, which can make the product easy to demould, and is not easy to produce cracks and defects, thereby ensuring the yield rate.

[0053] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A variable diameter concrete precast pile mould, comprising an upper mould (1), a lower mould (2) and a lining mould assembly (3), wherein the upper mould (1) and the lower mould (2) are spliced ​​to form a closed casting cavity, the lining mould assembly (3) is arranged in a set in the casting cavity, the lining mould assembly (3) comprises an upper lining mould (31) and a lower lining mould (32) of the same structure, the upper lining mould (31) is connected to the inner wall of the upper mould (1), the lower lining mould (32) is connected to the inner wall of the lower mould (2), the upper lining mould (31) and the lower lining mould (32) are spliced ​​to form a variable diameter casting cavity, Features: The upper mold (1) and the lower mold (2) are respectively provided with a connecting hole (4); the outer walls of the upper lining template (31) and the lower lining template (32) are both provided with a lining template connecting portion (5) coaxial with the connecting hole (4); the upper mold (1) and the lower mold (2) are respectively detachably connected to the upper lining template (31) and the lower lining template (32) via the lining template connecting portion (5).

2. The variable diameter precast concrete pile mold according to claim 1 is characterized by: The outer walls of the upper lining template (31) and the lower lining template (32) are respectively provided with rib plates (6); the height of the lining template connection portion (5) is less than the height of the rib plates (6).

3. The variable diameter concrete precast pile mold according to claim 2 is characterized by: It also comprises a positioning bolt (7), wherein the positioning bolt (7) is connected to the lining template connecting portion (5) through the connecting hole (4), the lining template connecting portion (5) comprises a first threaded hole (51), and the positioning bolt (7) is installed in the first threaded hole (51).

4. The variable diameter precast concrete pile mold according to claim 3 is characterized by: The positioning bolt (7) comprises a nut, a first limiting shaft (71) and a positioning threaded portion (72) in sequence, wherein the diameter of the first limiting shaft (71) is greater than the diameter of the positioning threaded portion (72); the lining template connecting portion (5) further comprises a first limiting hole (52) which is in communication with the first threaded hole (51), the first limiting shaft (71) is installed in the first limiting hole (52), and the positioning threaded portion (72) is threadedly connected to the first threaded hole (51).

5. The variable diameter precast concrete pile mold according to claim 4 is characterized in that: The outer mold connecting block (81) is arranged at positions of the upper mold (1) and the lower mold (2) corresponding to the connecting holes (4); a second threaded hole (811) and a second limiting hole (812) which is in communication with the second threaded hole (811) are arranged on the outer mold connecting block (81); the positioning bolt (7) further comprises a third limiting shaft (73), and the third limiting shaft (73) is installed in the second limiting hole (812); the embedded end of the outer mold connecting block (81) does not exceed the inner wall of the casting cavity.

6. The variable diameter precast concrete pile mold according to claim 1, characterized in that: The invention comprises an outer mould connection block (81), wherein the outer mould connection block (81) is arranged at positions of the upper mould (1) and the lower mould (2) corresponding to the connection holes (4); a second threaded hole (811) and a second limiting hole (812) which is in communication with the second threaded hole (811) are arranged on the outer mould connection block (81); a blocking bolt (82) is installed in the second threaded hole (811); and an embedded end of the outer mould connection block (81) does not exceed the inner wall of the casting cavity.

7. The variable diameter precast concrete pile mold according to claim 6, characterized in that: The blocking bolt (82) comprises a nut, a blocking threaded portion (821) and a second limiting shaft (822) in sequence, wherein the diameter of the second limiting shaft (822) is smaller than the diameter of the blocking threaded portion (821); the outer mold connecting block (81) further comprises a second limiting hole (812) which passes through the second threaded hole (811), the second limiting shaft (822) is installed in the second limiting hole (812), and the blocking threaded portion (821) is threadedly connected to the second threaded hole (811).

8. The variable diameter precast concrete pile mold according to claim 2 is characterized by: The ribs (6) on the outer walls of the upper lining template (31) and the lower lining template (32) respectively include lining annular ribs (61) and lining axial ribs (62), and the height of the lining template connection portion (5) is smaller than the highest rib among the lining annular ribs (61) and the lining axial ribs (62).

9. The variable diameter precast concrete pile mold according to claim 8, characterized in that: Liner axial tongue-and-groove plates (9) are respectively provided at two radial ends of the upper liner template (31).

10. The variable diameter precast concrete pile mold according to claim 1, characterized in that: The upper lining template (31) comprises a lining template body (311) and an annular inclined plate (312); one end of the annular inclined plate (312) is connected to the lining template body (311), and the other end is in close contact with the inner wall of the upper mold (1).

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