Inner mold device for prefabricated hollow components

Abstract

The embodiment of the present application provides an inner mold device for prefabricating hollow components, which relates to pile foundation manufacturing technology and is used to overcome the problem in related technologies that the centrifugal process is used due to the small space that makes it impossible to manually install the inner mold, resulting in poor pile quality. The inner mold device for prefabricating hollow components includes: a plurality of inner templates, which can be enclosed into a hollow column; a central rod shaft, which is inserted into the column enclosed by the inner templates; a strut group, which is used to hinge the inner template with the central rod shaft, and the length of the struts in some strut groups is greater than the length of the struts in other parts of the strut group; wherein, when the central rod shaft moves along its axial direction, the struts in the strut group rotate accordingly, and the struts drive the inner template to move toward or away from the central rod shaft.

Description

Technical Field

[0001] The present application relates to pile foundation manufacturing technology, and in particular to an inner mold device for prefabricating hollow components. Background Art

[0002] A pile foundation is a type of foundation that connects the tops of several piles together through a cap to support the load. Due to its high load-bearing capacity and wide range of applications, it is widely used in projects such as ports and bridges. Precast hollow pile foundations are a common type of pile foundation, with advantages such as low concrete consumption, factory-fabricated construction, and shortened manufacturing time.

[0003] Currently, prefabricated hollow pile foundations, such as PHC pipe piles and prefabricated hollow square piles, are in huge demand. Improving the quality of pile foundations has significant socioeconomic and environmental benefits. In related technologies, the prefabrication of hollow components often utilizes a centrifugal forming process, as conventional manual internal formwork installation is impractical due to the limited space available. However, this process results in relatively poor pile foundation concrete density, which in turn leads to poor concrete strength and pile quality. Summary of the Invention

[0004] In an embodiment of the present application, an inner mold device for prefabricating hollow components is provided to overcome the problem in the related art that the centrifugal process is used due to the small space in which manual inner mold installation is impossible, resulting in poor pile quality.

[0005] The present application provides an inner mold device for prefabricating hollow components, comprising:

[0006] A plurality of inner templates, wherein the plurality of inner templates can be enclosed to form a hollow column;

[0007] A central rod shaft, the central rod shaft being inserted into the column enclosed by the inner template;

[0008] A support rod group, the support rod group is used to hinge the inner template with the central rod axis, and the length of the support rods in some support rod groups is greater than the length of the support rods in other parts of the support rod group;

[0009] When the central rod axis moves along its axial direction, the struts in the strut group rotate accordingly, and the struts drive the inner template to move toward or away from the central rod axis.

[0010] In one possible implementation, at least some of the plurality of strut groups are used to hinge two oppositely disposed inner templates to the central rod axis, respectively.

[0011] In one possible implementation, the inner formwork has an even number; the inner formwork includes a first type of steel plate and a second type of steel plate; the first type of steel plate and the second type of steel plate are distributed alternately, and the first type of steel plate is arranged opposite to the first type of steel plate, and the second type of steel plate is arranged opposite to the second type of steel plate.

[0012] In one possible implementation manner, the length of the struts in the strut group connected to the first type of steel plate is greater than the length of the struts in the strut group connected to the second type of steel plate.

[0013] In one possible implementation manner, the first type of steel plate has a first connection surface for connecting to the second type of steel plate, and the first connection surface is used to limit the inward movement of the adjacent second type of steel plate.

[0014] In one possible implementation manner, the first connecting surface is an inclined surface; and the second type steel plate has a second connecting surface connected to the first connecting surface.

[0015] In one possible implementation, a stopper is provided on the inner side of the first connecting surface. The stopper extends out of the first connecting surface in the circumferential direction and can abut against the inner wall of the adjacent second type steel plate.

[0016] In one possible implementation manner, there are an odd number of inner templates; and at least one inner template among the odd number of inner templates is hinged to the central rod axis through an independent support rod.

[0017] In one possible implementation manner, steel ribs are provided on the inner side of the inner template, and the steel ribs are hinged to the struts in the strut group.

[0018] In one possible implementation manner, at least one end of the central rod shaft is provided with a locking opening, and the locking opening is used to connect with an adjacent central rod shaft.

[0019] In one possible implementation, the two opposing inner templates are hinged to the central rod axis via a plurality of strut groups; and the plurality of strut groups are distributed at intervals.

[0020] In one possible implementation, the cross section of the column surrounded by the multiple inner templates is circular, elliptical or polygonal.

[0021] An embodiment of the present application provides an inner mold device for prefabricated hollow components, including multiple inner mold plates for enclosing a hollow column, and a central rod shaft is arranged in the hollow column, and the inner mold plate is hinged to the central rod shaft through a support rod group. In this way, by controlling the movement of the central rod shaft, the inner mold plate is driven to expand to act as an inner mold, or the inner mold plate is driven to retract to separate from the hollow component, thereby meeting the needs of construction in a narrow space, facilitating the preparation of hollow components through conventional casting processes, and eliminating the need to use a centrifugal process to make hollow components, thereby facilitating ensuring that the density of the pile foundation concrete can meet the quality requirements, and ensuring the concrete strength and pile quality; and the inner mold device provided in this embodiment can be made of high-temperature resistant materials, which is conducive to adapting to modern high-temperature steaming curing processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A schematic longitudinal cross-sectional view of an inner mold device provided by an exemplary embodiment;

[0024] Figure 2 A schematic longitudinal cross-sectional view of an inner mold device at another angle provided by an exemplary embodiment;

[0025] Figure 3 A schematic cross-sectional view of an inner mold device (when the inner mold plate is in an expanded position) provided by an exemplary embodiment;

[0026] Figure 4 A schematic cross-sectional view of an inner mold device (when the inner mold plate is in the retracted position) provided by an exemplary embodiment;

[0027] Figure 5 A schematic diagram of an inner mold device provided by an exemplary embodiment when used for a hollow component with an elliptical cross section;

[0028] Figure 6 A schematic structural diagram of an inner mold device provided by an exemplary embodiment having a multi-section central rod shaft.

[0029] Description of reference numerals:

[0030] 1-inner template; 11-first type steel plate; 111-first connecting surface; 112-stopper; 12-second type steel plate; 121-second connecting surface; 2-center rod axis; 21-locking mouth; 3-support rod group; 4-steel rib. DETAILED DESCRIPTION

[0031] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0032] When prefabricating hollow components, conventional inner mold installation is impossible in a small space, so how to prefabricate hollow piles is an urgent problem to be solved.

[0033] In related technologies, when prefabricating hollow components, conventional manual inner mold installation is impractical in confined spaces. Therefore, centrifugal molding is typically used. However, this process results in relatively poor density of the pile foundation concrete, which in turn leads to poor concrete strength and pile quality. Additionally, other technologies use airbags as inner molds to prefabricate hollow components. However, these airbags are prone to floating, displacement, and aging and deformation, making pile quality difficult to guarantee. Furthermore, modern curing processes such as high-temperature steaming are not feasible.

[0034] In order to overcome the above problems, the present embodiment provides an inner mold device for prefabricated hollow components, including multiple inner molds for enclosing a hollow column, and a central rod shaft is arranged in the hollow column, and the inner mold is hinged to the central rod shaft through a strut group. In this way, by controlling the movement of the central rod shaft, the inner mold is driven to expand to act as an inner mold, or the inner mold is driven to shrink to separate from the hollow component, thereby meeting the needs of construction in a narrow space, and is conducive to the preparation of hollow components through conventional casting processes, and no longer needs to use centrifugal processes to make hollow components, thereby ensuring that the density of the pile foundation concrete can meet the quality requirements, and is conducive to ensuring the strength of the concrete and the quality of the pile; and the inner mold device provided in this embodiment can be made of high-temperature resistant materials, which is conducive to adapting to modern high-temperature steaming curing processes.

[0035] The following is combined with Figures 1 to 6 The structure, function and implementation process of the inner mold device provided in this embodiment are illustrated with examples.

[0036] like Figures 1 to 6 As shown, the inner mold device for prefabricating hollow components provided in this embodiment includes: an inner mold plate 1, a central rod shaft 2 and a support rod group 3.

[0037] There are multiple inner templates 1, and the multiple inner templates 1 are spliced ​​together to form a hollow cylinder. The cylinder can be a cylinder, an elliptical cylinder, a cubic cylinder, etc. The cross-section of the cylinder surrounded by the multiple inner templates 1 can be circular, elliptical, or polygonal. When the cross-section of the cylinder surrounded by the multiple inner templates 1 is circular, the inner template 1 can be an arc-shaped plate, and the arc-shaped plate can specifically be a circular arc plate. When the cross-section of the cylinder surrounded by the multiple inner templates 1 is elliptical, the inner template 1 can be an elliptical arc plate. When the cross-section of the cylinder surrounded by the multiple inner templates 1 is polygonal, such as rectangular, the inner template 1 can be a flat plate.

[0038] In some examples, the number of inner templates 1 can be an even number. In this case, two inner templates 1 arranged opposite each other can form a pair. Each pair of inner templates 1 is hinged to the central rod axis 2 via a rod assembly 3. The number of rods in the rod assembly 3 matches the number of inner templates 1, so that the two inner templates 1 in each pair of inner templates 1 are hinged to the central rod axis 2 via a rod assembly 3.

[0039] In a specific implementation, each pair of inner formwork 1 is hinged to the central shaft 2 via multiple sets of struts 3, with the multiple sets of struts 3 spaced apart. For example, each pair of inner formwork 1 is hinged to the central shaft 2 via two sets of struts 3, with the two sets of struts 3 positioned at the two ends of the inner formwork 1. For another example, each pair of inner formwork 1 is hinged to the central shaft 2 via three sets of struts 3, with two sets positioned at the two ends of the inner formwork 1 and one set positioned in the middle of the inner formwork 1.

[0040] In other examples, the number of inner templates 1 can be an odd number. Each inner template 1 is hinged to the central rod axis 2 via an independent strut group 3, in which case the strut group 3 has one strut. Alternatively, two spaced inner templates 1 are hinged to the central rod axis 2 via a single strut group 3, in which case the strut group 3 has two struts.

[0041] It is understood that the number of struts in the strut assembly 3 matches the number of inner templates 1 to which it is connected. When the strut assembly 3 articulates a pair of inner templates 1 to the central rod axis 2, the strut assembly 3 has two struts. When the strut assembly 3 articulates a single inner template 1 to the central rod axis 2, the strut assembly 3 has one strut.

[0042] For example, if there are five inner templates 1, and some of them are symmetrically distributed, there can be two pairs of inner templates 1, each of which is hinged to the central rod axis 2 via a rod in the rod group 3; the other inner template 1 is hinged to the central rod axis 2 via a rod in the rod group 3. If the five inner templates 1 are asymmetrical, each inner template 1 is hinged to the central rod axis 2 via a separate rod group 3.

[0043] In the above examples, each strut in the strut group 3 can be a rod body or multiple rod bodies arranged in parallel, which can be set according to actual needs and is not limited in this embodiment; Figures 3 to 5 As shown, the support rod includes multiple rods arranged in parallel, which is conducive to improving the load-bearing capacity of the support rod and extending the service life of the inner mold device. The dimensions of the inner mold plate 1, such as the curvature and circumferential length, can be set according to the hollow component.

[0044] In this example, Figures 1 to 4 As shown, the length of the struts 3a in some strut groups is greater than the length of the struts 3b in other strut groups, so that the displacement of some inner templates 1 relative to the central rod axis 2 is greater than that of the other parts, thereby achieving expansion or contraction of the inner template 1.

[0045] The end of the center rod shaft 2 may be provided with an operating portion, which allows the operator to pull the center rod shaft 2 to facilitate the control of the expansion or retraction of the inner guard plate. The center rod shaft 2 is used to drive the inner template 1 to move to the expansion position or the retraction position through the strut group 3; the distance between the inner template 1 and the center rod shaft 2 when it is in the expansion position is greater than the distance when it is in the retraction position. Specifically, when the center rod shaft 2 moves along its axial direction, the struts in the strut group 3 rotate accordingly, and the rotating struts drive the inner template 1 connected thereto to move toward the center rod shaft 2 so that the inner template 1 retracts or moves away from the center rod shaft 2 so that the inner template 1 expands. When the inner template 1 is in the expansion position, the inner template 1 is used to support the inner wall of the hollow member. When the inner template 1 switches from the expansion position to the retraction position, the inner template 1 is detached from the hollow member.

[0046] Optionally, at least one end of the central rod 2 is provided with a locking port 21, which can be used as an operating portion or for connecting with an adjacent central rod 2, so that the axial length of the inner mold device can be adjusted. When the length of the hollow member is short, an inner mold device with a single section of the central rod 2 can be used; when the length of the hollow member is long, an inner mold device with multiple sections of the central rod 2 can be used, such as Figure 6 As shown. It will be understood that when an inner mold assembly comprises a multi-section central shaft 2, each central shaft 2 is provided with an inner mold plate 1 and a support rod assembly 3. The structure of the locking notch 21 can adopt conventional configurations in the art and is not limited in this embodiment. Furthermore, the locking notch 21 can also be connected to a fixing device to secure and position the inner mold assembly.

[0047] In addition, in order to adapt to the modern curing process of high-temperature cooking, the components in the inner mold state in this example are made of high-temperature resistant materials, such as steel.

[0048] Optionally, steel ribs 4 are provided on the inner side of the inner formwork 1, and the steel ribs 4 are hinged to the struts in the strut group 3. The steel ribs 4 can be welded to the inner side surface of the inner formwork 1; or, the steel ribs 4 are integrally provided with the inner formwork 1. One end of the strut in the strut group 3 is hinged to the steel rib 4, and the other end is hinged to the center rod shaft 2. In this way, the strength of the inner formwork 1 is improved and the service life of the inner formwork device is extended. In a specific implementation, hinge seats are respectively provided on the steel ribs 4 and the center rod shaft 2, and hinge shafts are respectively provided at both ends of the struts, and the hinge shafts can be rotatably mounted to the hinge seats. Of course, it can be understood that when the inner formwork 1 is made of other high-temperature resistant materials, the steel ribs 4 can be ribs made of corresponding materials.

[0049] The following takes the example where the number of inner mold plates 1 is an even number to illustrate the implementation process of the inner mold device provided in this embodiment.

[0050] The inner formwork 1 includes a first type steel plate 11 and a second type steel plate 12 ; the first type steel plates 11 and the second type steel plates 12 are distributed alternately, and the first type steel plates 11 are arranged opposite to the first type steel plates 11 , and the second type steel plates 12 are arranged opposite to the second type steel plates 12 .

[0051] The length of the struts 3a in the strut group connected to the first type of steel plate 11 is greater than the length of the struts 3b in the strut group connected to the second type of steel plate 12. This allows the first type of steel plate 11 to move more relative to the central rod axis 2 than the second type of steel plate 12, thereby achieving expansion or contraction of each inner formwork 1. In a specific implementation, for example, with two first type steel plates 11 and two second type steel plates 12, the contracted first type steel plate 11 is positioned within the area enclosed by the contracted second type steel plates 12. The angles between the struts connected to the two types of steel plates and the central rod axis 2 are also different.

[0052] Optionally, the first type steel plate 11 has a first connecting surface 111 for connecting to the second type steel plate 12. The first connecting surface 111 is used to limit the inward movement of the adjacent second type steel plate 12, so that the first type steel plate 11 can move inward before the second type steel plate 12. In some examples, the first connecting surface 111 is an inclined surface; the second type steel plate 12 has a second connecting surface 121 that abuts the first connecting surface 111, and the second connecting surface 121 is an inclined surface that matches the first connecting surface 111. In other examples, the first connecting surface 111 can be a curved surface; the second connecting surface 121 of the second type steel plate 12 is a curved surface that matches the first connecting surface 111.

[0053] Optionally, a stopper 112 is provided on the inner side of the first connecting surface 111. The stopper 112 extends circumferentially beyond the first connecting surface 111 and can abut against the inner wall of the adjacent second-type steel plate 12, further ensuring that the first-type steel plate 11 can move inward before the second-type steel plate 12. In some examples, the stopper 112 is in the form of a strip extending axially along the inner template 1. In other examples, there are multiple stoppers 112, and the multiple stoppers 112 are spaced apart.

[0054] In a specific implementation, at least a portion of the stopper 112 corresponds to the corresponding strut assembly 3. When the first type steel plate 11 moves inward to the retracted position, the stopper 112 can abut against the hinge seat, steel rib 4, or strut to limit further inward movement of the first steel plate. When the second type steel plate 12 moves inward to the retracted position, the second type steel plate 12 abuts against the first type steel plate 11. When the first type steel plate 11 and the second type steel plate 12 move outward to the expanded position, the first type steel plate 11 and the second type steel plate 12 together enclose a hollow column.

[0055] When the number of inner templates 1 is an odd number, each inner template 1 can be hinged to the central rod shaft 2 through an independent strut group 3. At this time, the strut group 3 has one strut, and its specific implementation process can be the same as the above example.

[0056] In the inner mold device provided in this embodiment, the arc-shaped inner mold plates 1 are respectively connected to support rods of different lengths. The support rods connecting the two pairs of inner mold plates 1 are of different lengths and have different angles with the central hinge axis. Therefore, when the central rod axis 2 is pulled, the two pairs of inner mold plates 1 have different displacements, which can cause the two pairs of inner mold plates 1 to expand outward or shrink inward.

[0057] During specific operation, when used as an inner mold, the central rod shaft 2 is tightened to support the support rod group 3 outward, thereby expanding the two pairs of arc-shaped inner mold plates 1 outward to form a required circular, elliptical or polygonal inner mold.

[0058] When the inner formwork needs to be removed after the concrete is poured and formed, the central rod shaft 2 is tightened in the opposite direction, and the support rod group 3 is pulled inward to shrink the inner formwork 1 and separate it from the inner cavity of the prefabricated pipe pile. Then the inner formwork is pulled out and reused.

[0059] The present invention can be designed in standard sections, and a plurality of standard sections are connected through the lock 21 to form inner molds of different lengths to adapt to piles of different lengths, which is more convenient for construction operations.

[0060] In the description of this application, it should be understood that the terms "axial", "radial", "inner", "outer", 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 this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integrated; it can mean mechanical, electrical, or capable of mutual communication; it can mean direct or indirect connection through an intermediary; it can mean internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0063] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0064] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. An inner mold device for prefabricating hollow components, characterized in that: include: A plurality of inner templates, wherein the plurality of inner templates can be enclosed to form a hollow column; A central rod shaft, the central rod shaft being inserted into the column enclosed by the inner template; A support rod group, the support rod group is used to hinge the inner template with the central rod axis, and the length of the support rods in some support rod groups is greater than the length of the support rods in other parts of the support rod group; When the central rod axis moves along its axial direction, the rods in the rod group rotate accordingly, and the rods drive the inner template to move toward or away from the central rod axis; The inner template has an even number; the inner template includes a first type of steel plate and a second type of steel plate; the first type of steel plate and the second type of steel plate are alternately distributed, and the first type of steel plate is arranged opposite to the first type of steel plate, and the second type of steel plate is arranged opposite to the second type of steel plate; The first type steel plate has a first connection surface for connecting with the second type steel plate, and the first connection surface is used to limit the inward movement of the adjacent second type steel plate.

2. The inner mold device according to claim 1, characterized in that At least some of the plurality of support rod groups are used to hinge two inner templates that are arranged opposite to each other to the central rod axis.

3. The inner mold device according to claim 1, characterized in that The length of the struts in the strut group connected to the first type of steel plate is greater than the length of the struts in the strut group connected to the second type of steel plate.

4. The inner mold device according to claim 1, characterized in that The first connecting surface is an inclined surface; the second type steel plate has a second connecting surface connected to the first connecting surface.

5. The inner mold device according to claim 1, characterized in that A stopper is provided on the inner side of the first connecting surface. The stopper extends out of the first connecting surface in the circumferential direction and can abut against the inner wall of the adjacent second type steel plate.

6. The inner mold device according to claim 1, characterized in that There are an odd number of inner templates; at least one of the odd number of inner templates is hinged to the central rod axis through an independent support rod.

7. The inner mold device according to claim 1, characterized in that Steel ribs are provided on the inner side of the inner template, and the steel ribs are hinged to the struts in the strut group.

8. The inner mold device according to claim 1, characterized in that At least one end of the central rod shaft is provided with a locking opening, and the locking opening is used to connect with an adjacent central rod shaft.

9. The inner mold device according to claim 1, characterized in that The two opposite inner templates are hinged to the central rod axis through multiple groups of support rod groups; the multiple groups of support rod groups are distributed at intervals.

10. The inner mold device according to claim 1, characterized in that The cross section of the column surrounded by the multiple inner templates is circular, elliptical or polygonal.

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