Cast-in-place pile chiseling pile head separating system capable of accurately positioning, presplitting and chiseling

Abstract

The utility model provides a cast-in-place pile chiseling head separation system capable of accurately positioning, presplitting and chiseling, which comprises a virtual pile head system with a set size at the laitance of the top of a cast-in-place pile, and the virtual pile head system is connected with an embedded bar in the cast-in-place pile through a presplitting bracket assembly; the pre-splitting support assembly comprises a ring fixing piece, a hoisting piece and a plurality of sleeving pieces. Each sleeving piece is provided with a cavity matched with the corresponding embedded rib in an inserted mode, the bottom of each sleeving piece is flush with the top of the cast-in-place pile, and each sleeving piece is connected with an identification rubber sleeve used for positioning the cast-in-place pile and a chiseling-off parting line of a virtual pile head system. According to the construction method, through pre-embedded installation of the pre-splitting support, it is determined that the cutting line is chiseled away, concrete of the virtual pile head system is not condensed with the pre-embedded ribs, the difficulty of chiseling separation is reduced, meanwhile, the pre-embedded ribs are protected, bending deformation is prevented, a hoisting separation mode is adopted, the overall pre-splitting separation effect is remarkable, and the later repair cost is reduced.

Description

Technical Field

[0001] This application relates to the field of cast-in-place pile construction technology, and in particular to a precise positioning and pre-splitting chisel head separation system for cast-in-place piles. Background Technology

[0002] Cast-in-place pile foundations are a commonly used foundation type in modern construction. They are specifically designed to bear all the loads transmitted from the superstructure and transfer them to the substructure, ensuring the safety of the building foundation. They play an important role in many fields such as complex soil geological environments, high-rise buildings, bridges, and tunnels.

[0003] However, since cast-in-place piles involve pouring concrete into a pre-formed pile hole, to prevent air bubbles or pores from rising to the top of the pile during the concrete pouring process, resulting in a certain area of ​​laitance at the top, or a mixture of mud and mortar from underwater concrete pouring, it is necessary to remove the upper part of the pile by chiseling the pile head to ensure the strength of the pile concrete. Therefore, during the construction of cast-in-place piles, the pile top elevation should be 0.5~1.0m higher than the design elevation. For concrete pile heads exceeding the design elevation, electric picks, hydraulic breakers, and other related chiseling equipment are currently commonly used to remove the pile head. This is not only difficult to chisel, but also results in a lower flatness of the top of the cast-in-place pile after chiseling, making the pile head reinforcement prone to bending and deformation, difficult to repair, time-consuming, labor-intensive, and increasing construction costs. Utility Model Content

[0004] This application provides a precise positioning and pre-splitting method for separating the pile head of cast-in-place piles. The method uses a positioning and pre-splitting approach to specifically remove the dummy pile at the top of the cast-in-place pile, ensuring the flatness of the pile head, preventing the bending and deformation of the embedded reinforcement, and reducing the cost of subsequent repairs.

[0005] This application provides a precise positioning and pre-splitting removal system for the separation of the pile head of a cast-in-place pile. This precise positioning and pre-splitting removal system for the separation of the pile head includes a virtual pile head system of a set size floating slurry at the top of the cast-in-place pile. The virtual pile head system is connected to the pre-embedded reinforcing bars inside the cast-in-place pile through a pre-splitting support assembly.

[0006] The pre-splitting support assembly includes: a ring fastener embedded inside the dummy pile head system and flush with the top of the cast-in-place pile; a lifting component connecting the ring fastener and extending to the top of the dummy pile head system; and multiple sleeve components circumferentially connected along the periphery of the ring fastener; wherein...

[0007] Each of the aforementioned sockets has a cavity that is inserted into and fits with the corresponding pre-embedded reinforcement, and the top of each of the aforementioned sockets is vertically embedded inside the virtual pile head system, the bottom of each of the aforementioned sockets is flush with the top of the cast-in-place pile, and each of the aforementioned sockets is connected to a marking rubber sleeve for locating the chiseling dividing line between the cast-in-place pile and the virtual pile head system.

[0008] In this application, the pre-installation of the pre-splitting bracket determines the chiseling dividing line, and the concrete of the virtual pile head system does not solidify with the pre-embedded reinforcement, reducing the difficulty of chiseling and separation. At the same time, the pre-embedded reinforcement is protected to prevent bending deformation. The hoisting separation method is adopted, and the overall pre-splitting separation effect is significant, reducing the cost of later repair.

[0009] In one specific implementation scheme, the virtual pile head system is set to be 50cm to 100cm higher than the top of the cast-in-place pile. The virtual pile head system covers a certain range of laitance, or a mixture of mud and mortar from underwater concrete pouring, which is removed and separated to ensure the overall strength of the cast-in-place pile.

[0010] In one specific implementation, the ring fastener includes: an inner ring anchor fastener and an outer ring anchor fastener located on the same horizontal plane;

[0011] The inner ring anchor is fitted around the center of the outer ring anchor;

[0012] The inner ring anchor is connected to the outer ring anchor by multiple circumferentially distributed assembly rods. The inner and outer ring anchors form a chiseled cross-sectional structure, which facilitates the separation of the virtual pile head system from the top of the cast-in-place pile.

[0013] In one specific implementation, the lifting component includes: a lifting ring exposed at the top of the dummy pile head system, and lifting ribs connecting the lifting ring and extending into the interior of the dummy pile head system; wherein,

[0014] The lifting reinforcement bars are connected to the outer ring anchors via multiple circumferentially distributed first diagonal reinforcement bars, and the lifting reinforcement bars are connected to the inner ring anchors via multiple circumferentially distributed second diagonal reinforcement bars. The lifting method achieves integrated separation, reducing the difficulty of the chiseling process.

[0015] In one specific implementation, the bottom of both the outer and inner ring anchors is flush with the top of the cast-in-place pile, achieving a better pre-splitting segmentation area.

[0016] In one specific implementation, a plurality of the assembly rods are welded between the outer ring anchor and the inner ring anchor;

[0017] Multiple first diagonal tie bars are welded between the outer ring anchor and the hoisting bar;

[0018] Multiple second diagonal braces are welded between the inner ring anchor and the lifting brace. The overall connection strength is stable, facilitating lifting operations.

[0019] In one specific implementation scheme, the outer ring anchor has multiple anchoring holes spaced equidistantly along the circumference, and each of the sleeves is inserted into the corresponding anchoring hole. This multi-point positioning achieves a one-to-one correspondence between the sleeve and the embedded reinforcement.

[0020] In one specific implementation scheme, each of the socket components includes: a pre-splitting fastener and a vertical cylinder connecting the pre-splitting fastener; wherein...

[0021] The pre-splitting fastener is inserted into the bottom of the vertical cylinder, and both the pre-splitting fastener and the vertical cylinder have cavities for interlocking with the embedded reinforcement. This protects the embedded reinforcement from bending and deformation, while ensuring that the embedded reinforcement does not solidify with the concrete of the virtual pile head system, making it easy to detach.

[0022] In one specific implementation scheme, the vertical cylinder is a plastic tube, and the top of the vertical cylinder is sealed.

[0023] The pre-splitting fastener comprises two separate semi-circular steel sleeves, each with a right-angled wedge-shaped protrusion connected to its lower part. Its outer wall is smooth, making it less prone to setting with concrete.

[0024] In one specific implementation, both sides of the pre-cracked fastener are connected to plug rods;

[0025] Each of the aforementioned sockets further includes a connecting rod; wherein...

[0026] The connecting rod is plugged into the inner side of the pre-splitting fastener, and the end of the connecting rod away from the pre-splitting fastener is plugged into the corresponding anchoring hole.

[0027] The marking rubber sleeve is plugged into the outer plug rod of the pre-cracked fastener, and the end of the marking rubber sleeve away from the pre-cracked fastener protrudes from the outer surface of the virtual pile head system. For precise positioning, the marking rubber sleeve can be pre-cracked by chiseling away the crack along its circular markings before hoisting and separation. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of the precise positioning and pre-splitting separation system for the pile head of a cast-in-place pile provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the pre-cracked support assembly provided in the embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the socket provided in the embodiments of this application;

[0031] Figure 4This is a structural schematic diagram of the pre-cracked fastener provided in an embodiment of this application.

[0032] Icon labels:

[0033] Cast-in-place pile - 100, embedded reinforcement - 110, lower stirrups - 120;

[0034] Virtual pile head system-200, lifting ring-210, lifting reinforcement-211, first diagonal tie-bar-212, second diagonal tie-bar-213, vertical cylinder-220, pre-splitting fastener-230, wedge-shaped protrusion-231, plug-in rod-232, outer ring anchor-240, anchoring hole-241, inner ring anchor-250, assembly rod-251, marking rubber sleeve-260, connecting rod-270. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0036] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] To facilitate understanding of the precise positioning and pre-splitting removal system for separated cast-in-place pile heads provided in this application embodiment, its application scenario is first explained. Cast-in-place pile foundations are a commonly used foundation type in modern construction, specifically designed to bear all loads transmitted from the superstructure and transfer them to the substructure, ensuring the safety of the building foundation. They play a crucial role in complex soil geological environments, high-rise buildings, bridges, tunnels, and many other fields. However, since cast-in-place piles involve concrete pouring within a pre-formed pile hole, to prevent air bubbles or pores from rising to the pile top during concrete pouring, resulting in a certain area of ​​laitance at the pile top, or a mixture of mud and mortar from underwater concrete pouring, a pile head removal process is necessary to ensure the strength of the pile concrete. Therefore, during cast-in-place pile construction, the pile top elevation should be 0.5~1.0m higher than the design elevation. For concrete pile heads exceeding the design elevation, current methods often involve using electric picks, hydraulic breakers, and other similar equipment to remove them. This is not only difficult but also results in low flatness of the pile head after removal, making the reinforcing bars prone to bending and deformation, leading to difficult, time-consuming, and costly repairs. Therefore, this application provides a precise positioning and pre-splitting removal system for separating the pile head from the concrete pile. This system uses a positioning and pre-splitting method to specifically remove the loose pile head from the concrete pile, ensuring the flatness of the pile head, preventing bending and deformation of the embedded reinforcing bars, and reducing subsequent repair costs.

[0038] refer to Figure 1 The precise positioning and pre-splitting removal system for the pile head separation of cast-in-place piles provided in this application includes a virtual pile head system 200 of a predetermined size at the top of the cast-in-place pile 100. After the pile hole is excavated, a reinforcing cage is installed inside the pile hole. The reinforcing cage is formed by binding the lower annular stirrups 120 and longitudinal bars. The longitudinal bars extend to the top of the pile head of the cast-in-place pile 100 to form embedded bars 110, which are then connected to the building structure. When concrete is poured inside the pile hole, due to the rise of air bubbles or pores inside the concrete to the top of the pile, a certain area at the top of the pile is filled with slurry, or a mixture of mud and mortar from underwater concrete pouring. In order to ensure the strength of the pile body concrete, the virtual pile head system 200 at the top needs to be removed using a chiseling device. This is called pile head removal, which ensures the strength requirements of the cast-in-place pile 100. The top part of the cast-in-place pile 100 and the virtual pile head system 200 are both exposed outside the pile hole. They are cast using a formwork method, which makes it easy to remove the virtual pile head system 200 later. The pre-embedded reinforcement 110 facilitates connection to the building structure.

[0039] Therefore, the virtual pile head system 200 is designed to be 50cm to 100cm higher than the top of the cast-in-place pile 100. The virtual pile head system 200 covers a certain area containing laitance or a mixture of mud and mortar from underwater concrete pouring. This laitance is removed and separated to ensure the overall strength of the cast-in-place pile 100. The virtual pile head system 200 in this application uses a pre-splitting method to specifically target and separate the virtual piles that extend above the top of the cast-in-place pile 100, without damaging or deforming the embedded reinforcing bars 110. This improves the smoothness and ease of overall removal, achieving greater targeting and reducing subsequent repair costs.

[0040] Combination Figure 2 and Figure 3 As shown, the virtual pile head system 200 is connected to the embedded reinforcement 110 inside the cast-in-place pile 100 through the pre-splitting support assembly; the connection between the pre-splitting support assembly and the embedded reinforcement 110 is a set connection, so as to prevent the concrete from solidifying with the embedded reinforcement 110 and ensure the effect of pre-splitting separation.

[0041] The pre-splitting support assembly includes a ring fastener embedded inside the dummy pile head system 200 and flush with the top of the cast-in-place pile 100. This ring fastener includes an inner ring anchor 250 and an outer ring anchor 240 located on the same horizontal plane. The inner ring anchor 250 is fitted around the center of the outer ring anchor 240. The inner ring anchor 250 is connected to the outer ring anchor 240 by multiple circumferentially distributed assembly rods 251. The inner ring anchor 250 and the outer ring anchor 240 form a chiseled cross-sectional structure, facilitating the separation of the dummy pile head system 200 from the top of the cast-in-place pile 100. Furthermore, in a specific embodiment of this application, both the inner ring anchor 250 and the outer ring anchor 240 are surrounded by a 3mm thick steel strip in a circular shape, with a steel strip width of 3cm, thereby ensuring surface smoothness and stable strength when lifted and detached from the dummy pile head system 200.

[0042] It also includes a lifting component that connects to the ring fastener and extends to the top of the virtual pile head system 200; the lifting component includes: a lifting ring 210 exposed at the top of the virtual pile head system 200, and a lifting rib 211 connecting to the lifting ring 210 and extending into the interior of the virtual pile head system 200; wherein, the lifting rib 211 is connected to the outer ring anchor 240 through multiple circumferentially distributed first diagonal ribs 212, and the lifting rib 211 is connected to the inner ring anchor 250 through multiple circumferentially distributed second diagonal ribs 213. The lifting method achieves integrated separation, reducing the difficulty of the chiseling process. The bottom of both the outer ring anchor 240 and the inner ring anchor 250 are flush with the top of the cast-in-place pile 100, achieving a better pre-splitting segmentation area.

[0043] To achieve a stable connection, multiple assembly rods 251 are welded between the outer ring anchor 240 and the inner ring anchor 250; multiple first diagonal braces 212 are welded between the outer ring anchor 240 and the lifting brace 211; and multiple second diagonal braces 213 are welded between the inner ring anchor 250 and the lifting brace 211. The overall connection strength is stable, facilitating lifting operations. The welded connection forms an integral ring and lifting component, with a simple overall preparation method. Steel scrap from construction processes is used as the lifting ring 210, lifting brace 211, first diagonal brace 212, and second diagonal brace 213, thus achieving convenient material sourcing and full utilization of waste materials. Furthermore, the overall welding process is simple and easy to operate. Using steel strips as inner ring anchors 250 and outer ring anchors 240, and taking advantage of the easy-to-loosen property of the dummy pile head system 200, after hoisting and detaching from the dummy pile head system 200, the inner ring anchors 250 and outer ring anchors 240 can be separated from the concrete of the dummy pile head system 200 by chiseling tools such as electric picks, and reused, thus reducing manufacturing costs.

[0044] In addition, to ensure the protection of the embedded reinforcement 110 and the pre-splitting separation effect, multiple sleeves are also included, circumferentially connected along the periphery of the ring fastener. Each sleeve has a cavity that interlocks with the corresponding embedded reinforcement 110, and the top of each sleeve is vertically embedded inside the virtual pile head system 200. The bottom of each sleeve is flush with the top of the cast-in-place pile 100, and each sleeve is connected to a marking rubber sleeve 260 for positioning the chiseling dividing line between the cast-in-place pile 100 and the virtual pile head system 200. The marking rubber sleeve 260 is used to position the chiseling dividing line. When lifting and separating the virtual pile head system 200, tools such as electric picks can be used to pre-chisel out the cross-section along the chiseling dividing line, and then cables are installed and connected to the lifting ring 210 using excavators or other mechanical equipment to achieve rapid separation of the whole.

[0045] Specifically, the outer ring anchor 240 has multiple anchoring holes 241 spaced equidistantly along the circumference, and each sleeve is plugged into the corresponding anchoring hole 241. This multi-point positioning ensures a one-to-one correspondence between the sleeve and the embedded reinforcing bar 110.

[0046] Combination Figure 3 and Figure 4 As shown, each connector includes: a pre-splitting fastener 230 and a vertical cylinder 220 connecting the pre-splitting fastener 230; wherein, the pre-splitting fastener 230 is inserted into the bottom of the vertical cylinder 220, and both the pre-splitting fastener 230 and the vertical cylinder 220 have cavities for insertion and mating with the embedded reinforcement 110. This protects the embedded reinforcement 110 from bending deformation and ensures that the embedded reinforcement 110 does not solidify with the concrete of the virtual pile head system 200, making it easy to detach.

[0047] The vertical cylinder 220 is a plastic tube with a sealed top. Engineering plastic is used for the vertical cylinder 220 to ensure a smooth outer wall. The pre-splitting fastener 230 includes two separate semi-circular steel sleeves, each with a right-angled wedge-shaped protrusion 231 connected to its lower part. The outer wall is smooth, making it less prone to setting with concrete.

[0048] Both sides of the pre-cracked fastener 230 are connected to plug-in rods 232; each sleeve also includes a connecting rod 270; wherein, the connecting rod 270 is plugged into the plug-in rod 232 on the inner side of the pre-cracked fastener 230, and the end of the connecting rod 270 away from the pre-cracked fastener 230 is plugged into the corresponding anchoring hole 241; the marking rubber sleeve 260 is plugged into the plug-in rod 232 on the outer side of the pre-cracked fastener 230, and the end of the marking rubber sleeve 260 away from the pre-cracked fastener 230 is exposed on the outer surface of the virtual pile head system 200. To achieve precise positioning, the crack can be pre-cut along the circular marking line of the marking rubber sleeve 260 before hoisting and separation operations.

[0049] In this application, the ring fasteners and lifting components are pre-welded outside the pouring site. Then, the pre-crack fasteners 230 and vertical cylinders 220 are installed on-site, followed by the installation of the marking rubber sleeve 260. The pre-crack fasteners 230 and vertical cylinders 220 are fitted onto the embedded reinforcing bars 110. The connecting rod 270 is connected to the anchoring holes of the outer ring anchor 240. After installation, the marking rubber sleeve 260 is flush with the outer wall of the dummy pile head system 200. The pile body concrete is poured according to design requirements. During pouring, care is taken to ensure the pre-crack support components do not fall off and are accurately positioned. After the concrete is poured, it is cured according to construction requirements to ensure its strength development. The dummy pile head system 200 is directly removed along the pre-cracked surface using excavators or cranes. The pre-cracked surface is mainly formed by the pre-crack fasteners 230, marking rubber sleeves 260, inner ring anchors 250, outer ring anchors 240, and assembly rods 251.

[0050] In this application, the pre-installation of the pre-splitting bracket determines the chiseling dividing line, and the concrete of the virtual pile head system 200 does not solidify with the pre-embedded reinforcement 110, reducing the difficulty of chiseling and separation. At the same time, the pre-embedded reinforcement 110 is protected to prevent bending deformation. The hoisting separation method is adopted, and the overall pre-splitting separation effect is significant, reducing the cost of later repair.

[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification, which are not provided in detail for the sake of brevity.

[0052] Additionally, to simplify the description and discussion, and to avoid obscuring one or more embodiments of this specification, well-known power / ground connections for other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring one or more embodiments of this specification, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which one or more embodiments of this specification will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details have been set forth to describe exemplary embodiments of this disclosure, it will be apparent to those skilled in the art that one or more embodiments of this specification may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0053] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

Claims

1. A precise positioning and pre-splitting separation system for cast-in-place piles, comprising a virtual pile head system of predetermined dimensions exposed at the top of the cast-in-place pile, the virtual pile head system being connected to pre-embedded reinforcing bars inside the cast-in-place pile via a pre-splitting support assembly; characterized in that... The pre-splitting support assembly includes: a ring fastener embedded inside the dummy pile head system and flush with the top of the cast-in-place pile; a lifting component connecting the ring fastener and extending to the top of the dummy pile head system; and multiple sleeve components circumferentially connected along the periphery of the ring fastener; wherein... Each of the aforementioned sockets has a cavity that is inserted into and fits with the corresponding pre-embedded reinforcement, and the top of each of the aforementioned sockets is vertically embedded inside the virtual pile head system, the bottom of each of the aforementioned sockets is flush with the top of the cast-in-place pile, and each of the aforementioned sockets is connected to a marking rubber sleeve for locating the chiseling dividing line between the cast-in-place pile and the virtual pile head system.

2. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 1, characterized in that, The virtual pile head system is designed to be 50cm to 100cm higher than the top of the cast-in-place pile.

3. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 1, characterized in that, The ring fastener includes: an inner ring anchor fastener and an outer ring anchor fastener located on the same horizontal plane; The inner ring anchor is fitted around the center of the outer ring anchor; The inner ring anchor is connected to the outer ring anchor by multiple circumferentially distributed assembly rods.

4. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 3, characterized in that, The lifting components include: a lifting ring exposed at the top of the virtual pile head system, and lifting ribs connecting the lifting ring and extending into the interior of the virtual pile head system; wherein... The lifting reinforcement bar is connected to the outer ring anchor by multiple circumferentially distributed first diagonal reinforcement bars, and the lifting reinforcement bar is connected to the inner ring anchor by multiple circumferentially distributed second diagonal reinforcement bars.

5. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 4, characterized in that, The bottom of both the outer and inner ring anchors is flush with the top of the cast-in-place pile.

6. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 4, characterized in that, Multiple assembly rods are welded between the outer ring anchor and the inner ring anchor; Multiple first diagonal tie bars are welded between the outer ring anchor and the hoisting bar; Multiple second diagonal braces are welded between the inner ring anchor and the hoisting brace.

7. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 3, characterized in that, The outer ring anchor has multiple anchoring holes spaced equidistantly along the circumference, and each of the sleeves is plugged into the corresponding anchoring hole.

8. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 7, characterized in that, Each of the aforementioned sockets includes: a pre-splitting fastener and a vertical cylinder connecting the pre-splitting fastener; wherein, The pre-splitting fastener is inserted into the bottom of the vertical cylinder, and both the pre-splitting fastener and the vertical cylinder have cavities for insertion and engagement with the pre-embedded reinforcing bars.

9. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 8, characterized in that, The vertical cylinder is a plastic tube, and the top of the vertical cylinder is sealed. The pre-splitting fastener includes two separate semi-circular steel sleeves, and each semi-circular steel sleeve has a right-angled wedge-shaped protrusion connected to its lower part.

10. The precise positioning and pre-splitting removal system for separated pile heads in cast-in-place piles according to claim 9, characterized in that, Both sides of the pre-cracked fastener are connected to plug rods; Each of the aforementioned sockets further includes a connecting rod; wherein... The connecting rod is plugged into the inner side of the pre-splitting fastener, and the end of the connecting rod away from the pre-splitting fastener is plugged into the corresponding anchoring hole. The marking rubber sleeve is plugged into the outer plug rod of the pre-cracked fastener, and the end of the marking rubber sleeve away from the pre-cracked fastener is exposed on the outer surface of the virtual pile head system.

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