CN212528129U

CN212528129U - Variable cross-section precast pile mould and mould set

Info

Publication number: CN212528129U
Application number: CN202020360566.6U
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2021-02-12
Anticipated expiration: 2030-03-20

Abstract

The utility model provides a variable cross section precast pile mould, include: a first mold section and a second mold section longitudinally spliced to form a continuous mold cavity; the first split mold section forms a plurality of first middle fine mold cavity sections and first middle coarse mold cavity sections which are sequentially and alternately arranged between the two first end coarse mold cavity sections, and the length L1 of the first end coarse mold cavity sections is greater than the length L2 of the first middle coarse mold cavity sections; the second mold half section has at least a second end coarse mold cavity section and an end fine mold cavity section that extends at least partially into the first end coarse mold cavity section and has a remaining length Δ L of the first end coarse mold cavity section equal to the length L2 of the first intermediate coarse mold cavity section. The utility model discloses a stretch into the first end coarse mode chamber section of first die subsection with the tip fine mode chamber section of second die subsection and connect in order to produce the variable cross section precast pile of different length, the dismouting is simple and convenient, and is efficient.

Description

Variable cross-section precast pile mould and mould set

Technical Field

The utility model relates to a prefabricated component makes the field, especially relates to variable cross section precast pile mould and mould group.

Background

The variable cross-section precast pile is a precast pile with cross-sectional area alternately scaled in the axial direction, and the contact area of the precast pile can be effectively increased due to the concave-convex pile body, so that the bearing capacity and the pulling resistance of the precast pile are improved. In order to produce the precast pile, a special mould is needed, while the traditional mould is a mould with a fixed length and can only produce the precast pile with the variable cross section with one length specification, and if the precast piles with the variable cross sections with various lengths need to be produced, a plurality of sets of moulds matched with the lengths are needed, so that the resource waste is caused.

The prior art provides a concatenation formula precast pile mould includes a plurality of sections single section moulds, a plurality of sections single section mould splices one by one along its length direction and lets the die cavity of every section single section mould constitute whole stake shaping die cavity after the concatenation, and, between the single section mould of adjacent section, the tip of a section single section mould one end and the tip of another section single section mould one end compress tightly the cooperation and are connected, in addition, set up the notch that distributes along the cross-section orbit of single section mould on one of two complex tip, then formed the shape on another and matched with it block the lug, the notch with block the lug and compress tightly the cooperation. According to the technical scheme, a splicing precast pile mould with adjustable length is formed by adopting a plurality of sections of single-section moulds.

At present, in order to increase the bearing capacity of the end part of the variable cross-section precast pile, the end part of the variable cross-section precast pile is usually set into a thick pile section, and the length of the thick pile section at the end part is increased, so that the length of the thick cavity sections at two ends of the mould is longer than that of the thick cavity section at the middle part, and by adopting the technical scheme, if the length of the mould needs to be lengthened or shortened, if a single-section mould is added at two ends, the middle part of the produced variable cross-section precast pile can have a longer thick pile section, and the pile sinking construction difficulty of the pile machine for sinking the pile body with the fixed length clamped pile body is increased. Therefore, in order to avoid such a situation, only a single-section mold can be added or disassembled in the middle part, which requires a large workload of disassembling and assembling the two ends of the single-section mold, and increases the difficulty of longitudinal alignment during docking.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a variable cross section precast pile mould of easy and simple dismouting.

For solving the technical problem, the utility model discloses a following technical scheme:

variable cross section precast pile mould includes: a first mold section and a second mold section longitudinally spliced to form a continuous mold cavity;

the first split mold section forms a plurality of first middle fine mold cavity sections and first middle coarse mold cavity sections which are sequentially and alternately arranged between the two first end coarse mold cavity sections, and the length L1 of the first end coarse mold cavity sections is greater than the length L2 of the first middle coarse mold cavity sections;

the second mold half section has at least a second end coarse mold cavity section and an end fine mold cavity section that extends at least partially into the first end coarse mold cavity section and has a remaining length Δ L of the first end coarse mold cavity section equal to the length L2 of the first intermediate coarse mold cavity section.

Preferably, the second split mold section forms a plurality of second intermediate coarse mold cavity sections and second intermediate fine mold cavity sections which are sequentially and alternately arranged between the second end coarse mold cavity section and the end fine mold cavity section;

preferably, the end fine die cavity section of the second split die section is connected with the second middle coarse die cavity section and the second end coarse die cavity section through a die drawing inclined plane;

and/or the second middle fine die cavity section of the second split die section is connected with the second middle coarse die cavity section and the second end coarse die cavity section through a die drawing inclined plane.

Preferably, the outer side surface of the end fine die cavity section of the second die section is provided with a supporting block for filling a gap between the end fine die cavity section and the first end coarse die cavity section;

the length of the end fine cavity segment is substantially equal to the length of the first intermediate fine cavity segment. .

Preferably, the end part fine die cavity section is provided with a connecting hole penetrating through the supporting block, the first end part coarse die cavity section is provided with a positioning hole corresponding to the connecting hole, and the fastener penetrates through the connecting hole and the positioning hole to fixedly connect the second die section with the first die section.

Preferably, the connecting hole is a counter bore, and after the second die section and the first die section are connected and fixed by the fastener, the sealing cover matched with the connecting hole is buckled at the connecting hole;

and/or the positioning hole is a counter-sunk hole, and after the second die section is separated from the first die section, the sealing cover matched with the second die section is buckled at the positioning hole.

Preferably, the first middle fine mold cavity section of the first mold splitting section is connected with the first middle coarse mold cavity section and the first end coarse mold cavity section through a mold drawing inclined plane;

and/or the end fine die cavity section of the second split die section is connected with the first end coarse die cavity section of the first split die section through a die drawing inclined plane;

preferably, a sealing strip is arranged at the end face of a drawing inclined plane connected between the end fine die cavity section of the second die section and the first end coarse die cavity section of the first die section.

Preferably, a plurality of reinforcing ribs are arranged on the outer side surface of the first mold division section and/or the second mold division section at intervals.

Preferably, the distance L3 from the reinforcing rib of the second mold half section close to the end face of the end fine mold half section to the end face of the second mold half section is greater than or equal to the difference between the length L1 of the first end coarse mold half section and the length L2 of the first middle coarse mold half section.

Preferably, a connecting plate is arranged on the outer side face of the end part of the first end part coarse die cavity section, and the connecting plate is flush with the end face of the first end part coarse die cavity section;

and after the second die parting section extends into the first die parting section, the connecting plate is fixedly connected with the reinforcing rib close to the end surface of the end part fine die cavity section.

Another object of the utility model is to provide a variable cross section precast pile mould group, including two at least foretell variable cross section precast pile moulds, and variable cross section precast pile mould transversely arranges in proper order.

Compared with the prior art, the beneficial effects of the utility model are that: the first mould division section can produce the precast pile with variable cross section alone, when the length of the first mould division section is not enough to meet the production requirement, the second mould division section is connected with the first mould division section, the end part thin mould cavity section of the second mould division section extends into the first end part thick mould cavity section of the first mould division section, and the residual length delta L of the first end part thick mould cavity section is equal to the length L2 of the first middle thick mould cavity section, so that the first end part thick mould cavity section with longer length is divided into the first middle thick mould cavity section and the first middle thin mould cavity section, and the first mould division section and the second mould division section form a continuous mould cavity, so that the first mould division section and the second mould division section are connected together to form the precast pile with variable cross section, the first mould division section does not need to be disassembled during connection, only the second mould division section needs to be added at the end part of the first mould division section, the disassembly and assembly are simple and convenient, and the second mould division section can be added as required, the second mold section may be further added at the other end of the second mold section with the end fine cavity section of the second mold section extending into the second end coarse cavity section of an adjacent second mold section to further increase the length of the first mold section.

Drawings

Fig. 1 is a schematic structural view of a variable cross-section precast pile mold according to embodiment 1 of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at the letter A;

fig. 3 is a top view of the precast pile mold with variable cross section according to embodiment 1 of the present invention;

FIG. 4 is a cross-sectional view at letter B in FIG. 3;

fig. 5 is a schematic structural diagram of a second mold split section according to embodiment 1 of the present invention;

fig. 6 is a schematic structural diagram of another view angle of the second mold split section according to embodiment 1 of the present invention;

fig. 7 is a schematic structural view of a first mold split section according to the present invention;

fig. 8 is a schematic structural diagram of a second mold split section according to embodiment 2 of the present invention;

fig. 9 is a schematic structural view of a precast pile mold with a variable cross section according to embodiment 3 of the present invention;

fig. 10 is a partially enlarged view of fig. 9 at letter C.

Detailed Description

In order to facilitate understanding of the technical solutions of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, 2 and 3, the present embodiment provides a precast pile mould with variable cross-section, which is used for producing a precast pile with variable cross-section, and includes a first mold division section 1 and a second mold division section 2 that are longitudinally spliced into a continuous mold cavity, where the first mold division section 1 forms a plurality of first intermediate fine mold cavity sections 12 and first intermediate coarse mold cavity sections 11 that are alternately arranged in sequence between two first end coarse mold cavity sections 13, and a length L1 of the first end coarse mold cavity section 13 is greater than a length L2 of the first intermediate coarse mold cavity section 11; the second mold half 2 has a second end coarse mold cavity section 22 and an end fine mold cavity section, the end fine mold cavity section 21 extending at least partially into the first end coarse mold cavity section 13 and having a remaining length Δ L of the first end coarse mold cavity section 13 equal to the length L2 of the first intermediate coarse mold cavity section 11.

In the above structure, in order to ensure that the pile end can bear large bearing capacity during pile sinking of the variable cross-section precast pile, the end of the variable cross-section precast pile is an elongated thick pile section, so that the end of the first split-section 1 is set as a first end coarse-cavity section, and the length of the first end coarse-cavity section is increased, and the length L1 of the first end coarse-cavity section is greater than the length L2 of the first middle coarse-cavity section 11. In this embodiment, the first mold split section 1 and the second mold split section 2 are both U-shaped molds with openings above, and the first end coarse cavity section 13 of the first mold split section 1 and the second end coarse cavity section 22 of the second mold split section 2 have the same structural size and are used for forming a pile end coarse pile section of the variable cross-section precast pile; the end part fine die cavity section 21 of the second mould division section 2 is the same as the first middle fine die cavity section 12 of the first mould division section 1 in structural size and is used for forming a fine pile section of the variable cross-section precast pile; the first intermediate coarse cavity section 11 is used for forming an intermediate coarse pile section of the variable cross-section precast pile, and the first end coarse cavity section 13 is different from the first intermediate coarse cavity section 11 only in length. In the present exemplary embodiment, the second mold section 2 is composed of a second end coarse mold section 22 and an end fine mold section 21; the first mold split section 1 consists of two first end coarse mold cavity sections 13, three first intermediate coarse mold cavity sections 11 and two first intermediate fine mold cavity sections 12.

In the actual production process, the first mould-dividing section 1 can be used for producing the precast pile with the variable cross section, so that the end face of the first end coarse mould cavity section 13 is provided with an end plate. When the length of the variable cross-section precast pile to be produced needs to be increased, the first mold division section 1 cannot meet the production requirement, and a new mold is newly arranged, so that the cost is greatly increased. Therefore, in this embodiment, through the second mold split section 2, when the length of the first mold split section 1 is not enough to meet the production requirement, the second mold split section 2 is connected with the first mold split section 1, the end fine cavity section 21 of the second mold split section 2 extends into the first end coarse cavity section 13 of the first mold split section 1, and the remaining length Δ L of the first end coarse cavity section 13 is equal to the length L2 of the first intermediate coarse cavity section 11, so that the first end coarse cavity section 13 with a longer length is divided into the first intermediate coarse cavity section 11 and the first intermediate fine cavity section 12, and the first mold split section 1 and the second mold split section 2 form a continuous cavity, so that the first mold split section 1 and the second mold split section 2 are continuously formed into the variable cross-section precast pile together, when connecting, the first mold split section 1 does not need to be disassembled, but only the second mold split section 2 is added at the end of the first mold split section 1, the dismouting is simple and convenient, and can be as required, after increasing second die subsection 2, can continue to increase second die subsection 2 at the other end of second die subsection 2, stretch into the second tip coarse mode chamber section 22 of adjacent second die subsection 2 with the tip fine mode chamber section 21 of second die subsection 2 to further increase the length of first die subsection 1, thereby make first die subsection 1 originally can reuse, practice thrift the cost.

Further, as shown in fig. 6, since the dimensions of the end fine cavity segment 21 and the first end coarse cavity segment 13 in the radial direction are scaled, when the second mold segment 2 is connected to the first mold segment 1, a certain gap exists between the end fine cavity segment 21 and the first end coarse cavity segment 13, when concrete is distributed in the mold, the end fine cavity segment 21 is easily squeezed and deformed, thereby causing deformation of the pile body of the produced precast pile with a variable cross section, and therefore, support blocks 25 are provided on the outer side surface and/or the outer bottom surface of the end fine cavity segment 21 of the second mold segment 2, thereby filling the gap between the end fine cavity segment 21 and the first end coarse cavity segment 13. Preferably, the supporting blocks 25 may be uniformly disposed on the outer bottom surface and the outer side surfaces of the two sides of the end fine cavity segment 21.

Further, as shown in fig. 5, 6 and 7, the end portion fine mold cavity section 21 is provided with a connection hole 211 penetrating through the support block 25, the first end portion coarse mold cavity section 13 is provided with a positioning hole 131 corresponding to the connection hole 211, and the fastener penetrates through the connection hole 211 and the positioning hole 131 to connect and fix the second mold split section 2 and the first mold split section 1.

In the above structure, if the connection hole 211 bypasses the supporting block 25 and passes through the end portion fine cavity section 21, and then is connected to the first end portion coarse cavity section 13 through the fastener, the position of the connection hole 211 is not supported by the supporting block 25, and if the locking force of the fastener is too large, the connection hole 211 is opened in the end portion fine cavity section 21 by causing the fastening member to strain and deform the portion of the end portion fine cavity section 21 where the connection hole 211 is located, so that the pile body of the produced precast pile with the variable cross section deforms. Preferably, the fastener may be a spring bolt.

Furthermore, the connecting hole 211 is a counter-sunk hole, and after the fastener connects and fixes the second mold split section 2 and the first mold split section 1, the sealing cover matched with the connecting hole 211 is covered by the fastener; the positioning hole 131 is a countersunk hole, and after the second mold split section 2 is separated from the first mold split section 1, the positioning hole 131 is buckled and covered with a sealing cover matched with the positioning hole.

In the structure, due to the existence of the connecting hole 211 and the fastening piece, after the concrete material is distributed, the concrete material can flow into the connecting hole 211, and after the concrete is solidified, the pile body surface of the produced variable cross-section precast pile can have small bulges, the pile body is not flat and attractive, and the concrete can flow into the gap between the end part fine mould cavity section 21 and the first end part coarse mould cavity section 13, so that the raw material waste is caused. In addition, there is also solidified concrete between the connection hole 211 and the positioning hole 131 and between the fastening members, resulting in the fastening members not being easily detached. Therefore, the connecting hole 211 is set to be a countersunk structure, after the fastener connects and fixes the second mold division section 2 and the first mold division section 1, the connecting hole 211 is covered by the matched sealing cover, so that the end surface of the sealing cover is flush with the inner surface of the end fine mold cavity section 21, the connecting hole 211 is sealed, concrete can be prevented from flowing into the connecting hole 211, the fastener, the connecting hole 211 and the positioning hole 131 are condensed into a whole, and the pile body of the produced variable cross-section precast pile can be prevented from being uneven. Of course, when the second mold half 2 is removed and separately produced by using the first mold half 1, the above-mentioned problem will also exist due to the existence of the positioning hole 131, so that after the second mold half 2 is separated from the first mold half 1, the sealing cover matched with the positioning hole 131 is covered by the button.

Furthermore, the first intermediate fine cavity section 12 of the first mold section 1 is connected with the first intermediate coarse cavity section 11 through the mold drawing bevel 3.

In the structure, as the radial dimension between the first intermediate fine die cavity section 12 and the first intermediate coarse die cavity section 11 is scaled proportionally, a step surface exists between the first intermediate fine die cavity section 12 and the first intermediate coarse die cavity section 11, if the step surface is perpendicular to the inner surfaces of the first intermediate fine die cavity section 12 and the first intermediate coarse die cavity section 11, after concrete is solidified, the volume of the concrete is increased, the step surface and the surface of the formed variable cross-section precast pile generate a large friction force, the variable cross-section precast pile cannot be easily separated from the first split-die section 1, repeated lifting and demolding are needed, internal damage and surface irregular cracks are easily caused to the variable cross-section precast pile, the product quality is seriously influenced, and the steel dies are several tons of steel dies, the ground of the demolded after lifting and falling, the die is damaged, and the ground of a factory building is damaged; meanwhile, the steel die falls to form serious flying dust and noise pollution, which damage the health of workers. Therefore, the step surface is set to be in an inclined state, namely the drawing inclined surface 3, so that the friction force when the precast pile with the variable cross section is demolded is reduced. Similarly, the first end coarse die cavity section 13 is connected with the first middle fine die cavity section 12 through the die drawing inclined plane 3; the end fine die cavity section 21 of the second mold subsection 2 is connected with the first end coarse die cavity section 13 of the first mold subsection 1 through the mold drawing inclined plane 3.

In addition, in order to avoid the slurry leakage phenomenon at the joint of the drawing inclined plane 3 between the end fine cavity section 21 of the second mold division section 2 and the first end coarse cavity section 13 of the first mold division section 1, a sealing strip is arranged at the end face of the drawing inclined plane 3 connected between the end fine cavity section 21 and the first end coarse cavity section 13.

As shown in fig. 4, in order to make the precast pile with variable cross section easier to be released from the mold, a draft angle α is formed between the bottom formwork and the two side formworks of the first mold section 1, and α is greater than 90 ° to reduce the friction force of the two side formworks on the precast pile with variable cross section.

This embodiment also provides a variable cross section precast pile mould group, includes: at least two of the variable cross-section precast pile moulds are transversely arranged in sequence. The variable cross-section precast pile mould set can produce a plurality of variable cross-section precast piles with different sizes and specifications in one-time production process.

Example 2

In this embodiment, the same portions as those in embodiment 1 are given the same reference numerals, and the same description is omitted.

As shown in fig. 8, the second mold half 2 in this embodiment may also form a plurality of second intermediate coarse mold half sections 23 and second intermediate fine mold half sections 24 alternately arranged in sequence between the second end coarse mold half 22 and the end fine mold half 21, so as to lengthen the length of the second mold half 2, and thus to lengthen the length of the first mold half 1 after connecting with the second mold half 2. The second intermediate coarse die cavity section 23 has the same structural size as the first intermediate coarse die cavity section 11, and is used for forming an intermediate coarse pile section of the variable cross-section precast pile; the second intermediate fine cavity section 24 has the same structural dimension as the first intermediate fine cavity section 12, and is used for forming a fine pile section of the precast pile with the variable cross section. In the actual production process, if the number of the first mold split sections 1 is large and the number of the second mold split sections 2 is insufficient, in order to meet the production requirement, the first end coarse mold cavity section 13 of the first mold split section 1 can be removed to form the second mold split section 2.

In the present embodiment, the end fine cavity section 21 of the second mold split section 2 is connected with the second middle coarse cavity section 23 and the second end coarse cavity section 22 through the mold drawing bevel 3; the second middle fine die cavity section 24 of the second mold division section 2 is connected with the second middle coarse die cavity section 23 and the second end coarse die cavity section 22 through the mold drawing inclined plane 3.

Example 3

As shown in fig. 9 and 10, in this embodiment, since the volume of the concrete increases when the concrete is solidified, the two side forms of the first mold half 1 and the second mold half 2 are bent, and therefore, the reinforcing ribs 4 are provided at intervals on the outer side surfaces of the first mold half 1 and the second mold half 2.

The reinforcing rib 4 has a positioning and blocking function in addition to the function of preventing the formworks on both sides of the first mold half 1 and the second mold half 2 from being bent.

Specifically, the distance L3 from the reinforcing rib 4 of the second mold half 2 near the end face of the end fine mold half 21 to the end face of the second mold half 2 is greater than or equal to the difference between the length L1 of the first end coarse mold half 13 and the length L2 of the first middle coarse mold half 11. When the second mold split section 2 extends into the first mold split section 1, along with the continuous penetration of the second mold split section 2, the reinforcing rib 4 of the second mold split section 2 close to the end face of the end part fine mold cavity section 21 is gradually close to the end face of the first end part coarse mold cavity section 13 until the reinforcing rib 4 abuts against the end face of the first end part coarse mold cavity section 13, the end part fine mold cavity section 21 cannot continuously extend into the first end part coarse mold cavity section 13, at this time, the remaining length delta L of the first end part coarse mold cavity section 13 is just equal to the length L2 of the first middle coarse mold cavity section 11, and the first end part coarse mold cavity section 13 is just divided into a first middle coarse mold cavity section 11 and an end part fine mold cavity section 21. By the arrangement, repeated positioning can be performed without manpower, and the connection installation efficiency between the first split mold section 1 and the second split mold section 2 is improved.

Furthermore, in order to ensure that the connection between the first mold division section 1 and the second mold division section 2 is firmer, the outer side surface of the end part of the first end part coarse mold cavity section 13 is provided with the connecting plate 5, and the connecting plate 5 is flush with the end surface of the first end part coarse mold cavity section 13; after the second mold division 2 extends into the first mold division 1, the connecting plate 5 is fixedly connected with the reinforcing rib 4 close to the end face of the end fine mold cavity section 21.

The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is defined by the scope defined by the claims, and a plurality of modifications and decorations made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. Variable cross section precast pile mould, its characterized in that includes: a first mould section (1) and a second mould section (2) longitudinally spliced to form a continuous mould cavity;

the first split mold section (1) forms a plurality of first middle fine mold cavity sections (12) and first middle coarse mold cavity sections (11) which are sequentially and alternately arranged between two first end coarse mold cavity sections (13), and the length L1 of the first end coarse mold cavity sections (13) is greater than the length L2 of the first middle coarse mold cavity sections (11);

the second mold half section (2) has at least a second end coarse mold cavity section (22) and an end fine mold cavity section (21), the end fine mold cavity section (21) at least partially extending into the first end coarse mold cavity section (13) and having a remaining length Δ L of the first end coarse mold cavity section (13) equal to the length L2 of the first intermediate coarse mold cavity section (11).

2. The precast pile mould of variable cross section according to claim 1, wherein the second mold split section (2) forms a plurality of second intermediate coarse cavity sections (23) and second intermediate fine cavity sections (24) alternately arranged in sequence between the second end coarse cavity section (22) and the end fine cavity section (21).

3. The precast pile mould with the variable cross section according to claim 2 is characterized in that the end fine mould cavity section (21) of the second mould section (2) is connected with the second middle coarse mould cavity section (23) and the second end coarse mould cavity section (22) through a drawing bevel (3);

and/or a second middle fine die cavity section (24) of the second split die section (2) is connected with a second middle coarse die cavity section (23) and a second end coarse die cavity section (22) through a die drawing inclined plane (3).

4. The precast pile mould of variable cross section according to claim 1 or 2, characterized in that the outer side and/or the outer bottom surface of the end fine mould cavity section (21) is provided with support blocks (25) for filling the gap between the end fine mould cavity section (21) and the first end coarse mould cavity section (13).

5. The variable cross-section precast pile mould according to claim 4, characterized in that the length of the end fine mould cavity section (21) is substantially equal to the length of the first intermediate fine mould cavity section (12).

6. The precast pile mould with the variable cross section according to claim 4, wherein the end fine mould cavity section (21) is provided with a connecting hole (211) penetrating through the supporting block (25), the first end coarse mould cavity section (13) is provided with a positioning hole (131) corresponding to the connecting hole (211), and the fastener passes through the connecting hole (211) and the positioning hole (131) to connect and fix the second mould section (2) and the first mould section (1).

7. The precast pile mould with the variable cross section as claimed in claim 6, wherein the connecting hole (211) is a counter-sunk hole, and after the fastener connects and fixes the second mould subsection (2) and the first mould subsection (1), the sealing cover matched with the connecting hole (211) is covered;

and/or the positioning hole (131) is a counter-sunk hole, and after the second mould division section (2) is separated from the first mould division section (1), the positioning hole (131) is buckled and covered with a sealing cover matched with the positioning hole.

8. The precast pile mould with the variable cross section according to claim 1 or 2, wherein the first middle fine mould cavity section (12) of the first mould segment (1) is connected with the first middle coarse mould cavity section (11) through the drawing bevel (3), and the first end coarse mould cavity section (13) of the first middle fine mould cavity section (12) is connected with the first middle coarse mould cavity section (11);

and/or the end fine cavity section (21) of the second mold division section (2) is connected with the first end coarse cavity section (13) of the first mold division section (1) through a mold drawing bevel (3).

9. The variable cross-section precast pile mould of claim 8, wherein the end surface of the drawing bevel (3) between the end fine cavity section (21) of the second mould subsection (2) and the first end coarse cavity section (13) of the first mould subsection (1) is provided with a sealing strip.

10. The precast pile mould of variable cross section according to claim 1, characterized in that the outer side of the first and/or second mould section (1, 2) is provided with several reinforcing ribs (4) at intervals.

11. The precast pile mould of variable cross section according to claim 10, wherein the distance L3 from the reinforcing rib (4) of the second mould section (2) near the end face of the end fine mould section (21) to the end face of the second mould section (2) is greater than or equal to the difference between the length L1 of the first end coarse mould section (13) and the length L2 of the first middle coarse mould section (11).

12. The variable cross-section precast pile mould according to claim 11, wherein a connecting plate (5) is arranged at the outer side surface of the end of the first end coarse mould cavity section (13), and the connecting plate (5) is flush with the end surface of the first end coarse mould cavity section (13);

after the second mold division section (2) extends into the first mold division section (1), the connecting plate (5) is fixedly connected with the reinforcing rib (4) close to the end face of the end part fine mold cavity section (21).

13. A variable cross-section precast pile mould set comprising at least two variable cross-section precast pile moulds according to any one of claims 1 to 12, arranged in a transverse sequence.