A concrete variable cross-section precast pile mold and variable cross-section precast pile

Abstract

The utility model provides a kind of concrete variable cross section precast pile mould and variable cross section precast pile, including mould body and tensioning plate assembly;The mould body two ends are respectively installed tensioning plate assembly, and the tensioning plate assembly on at least one side can detachably install two link segments forming plate, and the butt joint surface of two link segments forming plate is matched with the parting surface of mould body;Link segment forming plate side extends into mould cavity, and is used to form the variable cross section section of precast pile end portion.The utility model is installed by link segment forming plate on tensioning plate assembly, not directly fixed in mould cavity, avoid the reform of mould body, simplify installation process, improve the versatility and turnover efficiency of mould.

Description

Technical Field

[0001] This utility model relates to the field of building material production technology, and in particular to a concrete variable cross-section precast pile mold and a variable cross-section precast pile. Background Technology

[0002] Precast concrete piles are a widely used component in building foundation engineering, possessing advantages such as high strength, fast construction speed, and stable quality. With the diversification and complexity of building structures, the requirements for the form and performance of precast piles are becoming increasingly stringent. Variable cross-section precast piles are gaining attention due to their ability to better adapt to different geological conditions and load distributions. Variable cross-section precast piles typically refer to pile types where the cross-sectional dimensions or shape change along the length direction, such as piles with reduced end cross-sections. These types of piles offer significant advantages in terms of improving bearing capacity and reducing material usage.

[0003] Currently, the main method for producing variable cross-section precast piles is through the modification of existing precast pile molds. Conventional precast pile molds are typically designed with a constant cross-section, such as a circular or square section. To produce variable cross-section piles, modules to form variable cross-section segments need to be added or modified inside the mold. Common practices include welding or bolting variable cross-section forming modules into the mold cavity. These modules are manufactured into specific shapes according to the design requirements of the precast pile and are fixed to the inner wall of the mold to form the variable cross-section segment. For example, when producing precast piles with tapered ends, tapered or stepped inner lining modules need to be installed at both ends of the mold to form a pile end with a gradually decreasing diameter.

[0004] However, the above methods have several problems. First, both welding and bolting require substantial modifications to the mold body, which not only increases manufacturing costs but also reduces the mold's turnover efficiency. Mold modifications often require specialized equipment and skilled technicians, are time-consuming, and may cause irreversible damage to the mold during the modification process, such as welding deformation or bolt hole enlargement, affecting the mold's accuracy and lifespan. Second, the modified mold requires secondary processing to restore it to its original state, further increasing costs and downtime, and reducing economic efficiency. In addition, the variable cross-section module requires high installation accuracy; any deviation can easily lead to concrete leakage during pouring, especially at the junction of the pile end and the tensioning plate. Grout leakage not only affects the appearance quality of the pile but may also seep into the tensioning components, interfering with the tensioning process and even endangering tensioning safety.

[0005] In existing technologies, some attempts have been made to produce variable cross-section piles using flexible or modular molds. However, these solutions are often structurally complex, costly to manufacture, and inconvenient to operate. For example, while some rigid-flexible molds can adapt to a certain degree of cross-sectional change, problems such as poor sealing and grout leakage are prone to occur at the connection between the rigid and flexible parts. Furthermore, the durability of flexible materials is poor, requiring frequent replacement and increasing maintenance costs. In addition, variable cross-section modules usually need to be pre-fixed in the mold cavity, and their position and size need to be precisely adjusted according to the length of the precast pile. Improper installation can not only lead to grout leakage but may also result in substandard pile geometry, affecting the overall project quality.

[0006] Therefore, there is an urgent need in this field for a variable cross-section precast pile mold that is simple in structure, easy to install, and requires no modification to the mold body, so as to improve production efficiency, reduce costs and mold damage risks while ensuring molding quality. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this utility model provides a concrete variable cross-section precast pile mold and a variable cross-section precast pile. By detachably installing a connecting section forming plate on the tensioning plate assembly, the variable cross-section section can be formed without modifying the mold body, thus improving production efficiency and maintaining the structural strength and service life of the mold.

[0008] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0009] A precast concrete pile mold with variable cross-section includes a mold body and a tensioning plate assembly. Tensioning plate assemblies are installed at both ends of the mold body. Two connecting section forming plates are detachably installed on at least one side of the tensioning plate assembly. The mating surfaces of the two connecting section forming plates match the parting surface of the mold body. One side of each connecting section forming plate extends into the mold cavity to form the variable cross-section segment at the end of the precast pile. By installing the connecting section forming plates on the tensioning plate assembly, rather than directly fixing them into the mold cavity, modification of the mold body is avoided, the installation process is simplified, and the versatility and turnover efficiency of the mold are improved.

[0010] Furthermore, the inner cavity formed by splicing the two connecting section molding plates is a cavity with a gradually decreasing diameter. This design enables the molding of precast piles with gradually decreasing end cross-sections, adapting to different engineering needs.

[0011] Furthermore, the connecting section forming plate includes a reinforcing plate and a protective sleeve. The reinforcing plate is installed at one end of the protective sleeve and is connected to the tensioning plate assembly through the reinforcing plate; the other end of the protective sleeve extends into the mold cavity. The reinforcing plate improves the overall rigidity of the connecting section forming plate, while the protective sleeve directly participates in the forming of the variable cross-section section.

[0012] Furthermore, a transition body is provided at the other end of the casing, extending into the mold cavity to form the transition section between the variable cross-section segment and the pile body. The transition body ensures a smooth connection between the variable cross-section segment and the pile body, improving the structural performance and appearance quality of the pile.

[0013] Furthermore, the transition body is a semi-circular ring with a triangular cross-section. The bottom edge of the triangular cross-section transition body is connected to the protective sleeve, and the top edge of the triangular cross-section transition body extends into the mold cavity. The hypotenuse of the triangular cross-section transition body is used to form the transition section between the variable cross-section segment and the pile body. The triangular cross-section design gives the transition section sufficient structural strength and facilitates demolding.

[0014] Furthermore, the hypotenuse of the transition body described in the triangular cross-section is arc-shaped. The arc-shaped hypotenuse can form a smoother transition surface, reduce stress concentration, and improve the durability of the pile.

[0015] Furthermore, it also includes reinforcing ribs, the outer ring of which protrudes beyond the outer diameter of the protective sleeve. Reinforcing ribs are provided at the protrusions on the outer ring of the reinforcing plate, connecting the reinforcing plate, the protective sleeve, and the transition body together to form a single unit. The reinforcing ribs significantly enhance the overall rigidity and stability of the forming plate of the connecting section, preventing deformation during casting and demolding.

[0016] Furthermore, the reinforcing plate is provided with a number of fixing holes, the number of which is set in a 1:2 or 1:1 ratio with the number of mounting holes on the tensioning plate assembly. This design allows the connecting section forming plate to flexibly adapt to tensioning plate assemblies of different specifications, improving the equipment's versatility and ease of installation.

[0017] A type of precast concrete pile with variable cross-section, wherein the precast concrete pile with variable cross-section is produced using the mold of the precast concrete pile with variable cross-section.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. The concrete variable cross-section precast pile mold of this utility model realizes the forming of variable cross-section sections by detachably installing the connecting section forming plate on the tensioning plate assembly. It does not require modification of the mold body, which significantly reduces processing costs and time, improves the turnover efficiency of the mold, fundamentally protects the mold, and significantly reduces modification costs and idle time of the mold.

[0020] 2. The concrete variable cross-section precast pile mold of this utility model avoids the direct installation of accessories in the mold cavity because the connecting section forming plate is installed on the tensioning plate assembly, reducing the risk of grout leakage and ensuring the stability of the tensioning process and the quality of the pile.

[0021] 3. The concrete variable cross-section precast pile mold of this utility model adopts an integrated design of reinforcing plate, casing and transition body for the connecting section forming plate, and enhances the overall rigidity by reinforcing ribs, thus ensuring the dimensional accuracy and structural strength of the forming section.

[0022] 4. The concrete variable cross-section precast pile mold of this utility model has a mating surface of the connecting section forming plate that matches the mold parting surface, which facilitates installation and disassembly, improves operation efficiency, and meets the production needs of different variable cross-section pile types.

[0023] 5. The concrete variable cross-section precast pile mold of this utility model adopts a triangular cross-section and arc-shaped hypotenuse design for the transition body, which makes the transition between the variable cross-section section and the pile body smooth, which is conducive to demolding, reduces stress concentration, and improves the mechanical properties and durability of the pile body.

[0024] 6. The concrete variable cross-section precast pile mold of this utility model has a fixing hole design on the reinforcing plate that matches the mounting hole on the tensioning plate assembly in proportion, which can realize the sharing of bolts, making installation and disassembly extremely convenient, greatly reducing the labor intensity of production personnel and improving installation efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of this utility model. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an exploded view of the concrete variable cross-section precast pile mold described in this utility model.

[0027] Figure 2 This is a three-dimensional view of the connecting section forming plate described in this utility model.

[0028] In the picture:

[0029] 1-Lower mold; 2-Upper mold; 3-Front tension plate assembly; 4-Rear tension plate assembly; 5-Connecting section forming plate; 501-Reinforcing plate; 502-Fixing hole; 503-Reinforcing rib plate; 504-Cylinder; 505-Transition body. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] like Figure 1 As shown, the concrete variable cross-section precast pile mold of this utility model includes a mold body and a tensioning plate assembly. The mold body includes an upper mold 1 and a lower mold 2, which form a mold cavity after being closed. A front tensioning plate assembly 3 and a rear tensioning plate assembly 4 are respectively installed at both ends of the mold body 1. Two connecting segment forming plates 5 are detachably installed on at least one side of the tensioning plate assembly. The mating surfaces of the two connecting segment forming plates 5 match the parting surface of the mold body 1, that is, the mating surfaces are coplanar with the parting surface or aligned within the manufacturing tolerance range. One side of the connecting segment forming plate 5 extends into the mold cavity to form the variable cross-section segment at the end of the precast pile. This utility model avoids mold modification and improves production efficiency and usage flexibility by installing the connecting segment forming plates 5 on the tensioning plate assembly instead of the inner wall of the mold body. Generally, the inner cavity formed by splicing the two connecting segment forming plates 5 is a cavity with a gradually decreasing diameter.

[0034] like Figure 2As shown, the connecting section forming plate 5 includes a reinforcing plate 501 and a protective sleeve 504. One end of the protective sleeve 504 is welded or bolted to the reinforcing plate 501 and connected to the tensioning plate assembly through the reinforcing plate 501; the other end of the protective sleeve 504 extends into the mold cavity. After the two connecting section forming plates 5 are spliced, the protective sleeve 504 portion forms a gradually narrowing inner cavity for forming a variable cross-section section.

[0035] For ease of manufacturing, the casing 504 is made of steel pipe. A transition body 505 is provided at the other end of the casing 504, extending into the mold cavity to form the transition section between the variable cross-section segment and the pile body. The transition body 505 is a semi-circular ring with a triangular cross-section. The base of the triangular cross-section transition body 505 connects to the casing 504, and the vertex extends into the mold cavity. The hypotenuse of the triangular cross-section transition body 505 is used to form the transition section between the variable cross-section segment and the pile body. Preferably, the hypotenuse is arc-shaped to create a smooth transition.

[0036] The outer ring of the reinforcing plate 501 protrudes beyond the outer diameter of the protective sleeve 504. A reinforcing rib 503 is provided at the protruding part of the outer ring of the reinforcing plate 501. The reinforcing rib 503 welds the reinforcing plate 501, the protective sleeve 504, and the transition body 505 together to form an integral structure, significantly improving rigidity and stability. Figure 2 As shown, the outer diameter of the protective sleeve 504 is smaller than the outer diameter of the reinforcing plate 501. The protective sleeve 504 is concentrically mounted on the reinforcing plate 501. Several reinforcing ribs 503 are evenly distributed on the protruding part of the outer ring of the reinforcing plate 501, and one end of the reinforcing rib 503 extends to the transition body 505. The outer ring of the reinforcing plate 501 is flush with the end of the reinforcing rib 503, which facilitates placement in the inner cavity.

[0037] The reinforcing plate 501 is provided with a plurality of fixing holes 502. The number of fixing holes 502 is set in a ratio of 1:2 or 1:1 with the number of mounting holes on the tensioning plate assembly. In the embodiment, the tensioning plate of the front tensioning plate assembly 2 has 8 mounting holes, so the reinforcing plate 501 can be provided with 4 or 8 fixing holes 502, so that the same set of bolts can be used for fixing during installation, which simplifies the structure and reduces the number of parts.

[0038] In production practice, the tensioning plate assembly may specifically include a head plate or tail plate, a baffle, a tensioning rod, and a locking nut. During installation, the reinforcing plate 501 of the connecting section forming plate 5 is tightly attached to the inner side of the head plate or tail plate and fixed using common bolts. The tensioning rod passes through the baffle and the reinforcing plate 501 and connects to the end of the reinforcing cage. Prestress is applied to the main reinforcement by tightening the locking nut. This installation integrates the connecting section forming plate 5 inside the tensioning system, rather than onto the mold cavity, which is key to avoiding mold modifications and preventing grout leakage.

[0039] A method for producing variable cross-section precast piles using concrete variable cross-section precast pile molds includes the following steps:

[0040] Step 1: After cutting the main reinforcement bars to the designed length, set the end caps at the ends of the reinforcement bars, place the main reinforcement bars on the cage reinforcement fabrication equipment, and weld the spiral stirrups along the outside of the main reinforcement bars to form the pile reinforcement cage;

[0041] Step 2: Hoist the pile reinforcement cage into the lower formwork 1 of the pile body, and install end plates at both ends of the reinforcement cage. Alternatively, in Step 1, install the end plates at both ends of the pile reinforcement cage before hoisting the entire cage into the lower formwork 1 of the pile body.

[0042] Step 3: For ease of description, the connecting section forming plate in the upper mold is called the upper connecting section forming plate, and the connecting section forming plate in the lower mold is called the lower connecting section forming plate; place the lower connecting section forming plate and the tensioning plate assembly at the lower part of the pile reinforcement cage end, rotate the pile reinforcement cage to align the tensioning screw holes on the end plate with the fixing holes of the reinforcing plate one by one, and then move the lower connecting section forming plate or the pile reinforcement cage axially to make the end plate and the reinforcing plate of the lower connecting section forming plate fit tightly together;

[0043] Step 4: Place the upper connecting section forming plates on the upper part of the pile body reinforcement cage, and locally adjust the upper forming plate so that the tension screw holes on the end plate are aligned with the fixing holes of the reinforcement plate one by one, and make the end plate and the reinforcement plate of the upper connecting section forming plate tightly attached; In steps 3 and 4, the installation of the upper connecting section forming plate and the lower connecting section forming plate can be completed simultaneously at one end before the installation of the upper and lower connecting section forming plates at the other end is completed.

[0044] Step 5: At the tail end of the pile body mold, simultaneously pass the tensioning screw through the tensioning hole on the tail plate and the fixing hole of the upper and lower connecting section forming plate, and install it with the tensioning hole on the end plate, thereby connecting the end plate, tail plate and upper and lower connecting section forming plate into a whole.

[0045] Step 6: At the head end of the pile mold, simultaneously pass the tensioning screws through the tensioning holes on the head plate and the fixing holes of the upper and lower connecting section forming plates, and install them with the tensioning holes on the end plate, thereby connecting the end plate, head plate, and upper and lower connecting section forming plates into a whole. The order of steps 5 and 6 can be interchanged;

[0046] Step 7: Hoist and install the mold on the pile body, and connect and close the mold using the side fasteners.

[0047] Step 8: Tension, lay, centrifuge, steam cure, and demold according to the existing process. Note that during demolding, after removing the tensioning screws, first remove the upper mold forming plate before lifting the precast pile.

[0048] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent embodiments or modifications made without departing from the spirit of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A precast concrete pile mold with variable cross-section, comprising a mold body and a tensioning plate assembly; wherein tensioning plate assemblies are respectively installed at both ends of the mold body, characterized in that, Two connecting section forming plates (5) are detachably installed on at least one side of the tensioning plate assembly, and the mating surfaces of the two connecting section forming plates (5) match the parting surface of the mold body; one side of the connecting section forming plate (5) extends into the mold cavity to form the variable cross section at the end of the precast pile.

2. The concrete variable cross-section precast pile mold according to claim 1, characterized in that, The inner cavity formed by splicing the two connecting section forming plates (5) is an inner cavity with a gradually decreasing diameter.

3. The concrete variable cross-section precast pile mold according to claim 1, characterized in that, The connecting section forming plate (5) includes a reinforcing plate (501) and a protective sleeve (504). The reinforcing plate (501) is installed at one end of the protective sleeve (504) and is connected to the tensioning plate assembly through the reinforcing plate (501). The other end of the protective sleeve (504) extends into the mold cavity.

4. The concrete variable cross-section precast pile mold according to claim 3, characterized in that, The other end of the casing (504) is provided with a transition body (505), which extends into the mold cavity and is used to form a transition section between the variable cross section and the pile body.

5. The concrete variable cross-section precast pile mold according to claim 4, characterized in that, The transition body (505) is a semi-circular ring with a triangular cross-section. The bottom edge of the triangular cross-section transition body (505) is connected to the casing (504), and the vertex of the triangular cross-section transition body (505) extends into the mold cavity. The hypotenuse of the triangular cross-section transition body (505) is used to form the transition section between the variable cross-section section and the pile body.

6. The concrete variable cross-section precast pile mold according to claim 5, characterized in that, The hypotenuse of the transition body (505) with a triangular cross-section is arc-shaped.

7. The concrete variable cross-section precast pile mold according to claim 4, characterized in that, It also includes a reinforcing rib (503), the outer ring of the reinforcing plate (501) protrudes from the outer diameter of the protective sleeve (504), and a reinforcing rib (503) is provided at the protrusion of the outer ring of the reinforcing plate (501). The reinforcing rib (503) connects the reinforcing plate (501), the protective sleeve (504) and the transition body (505) together to form a whole.

8. The concrete variable cross-section precast pile mold according to claim 3, characterized in that, The reinforcing plate (501) is provided with a number of fixing holes (502), and the number of fixing holes (502) is set in a ratio of 1:2 or 1:1 to the number of mounting holes on the tensioning plate assembly.

9. A precast concrete pile with variable cross-section, characterized in that, Variable cross-section precast piles produced using the concrete variable cross-section precast pile mold according to any one of claims 1-8.

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