External pouring concrete prefabricated composite pile

Abstract

The utility model discloses an outer pouring concrete prefabricated composite pile. The outer pouring concrete prefabricated composite pile comprises a prefabricated pipe pile; the concrete outer pile layer comprises an overlapping part and an extending part, the overlapping part is coaxially arranged outside the prefabricated pipe pile, and the extending part is connected with the overlapping part and located at the bottom of the prefabricated pipe pile. The concrete outer pile layer is poured at the bottom of the prefabricated pipe pile to form the composite pile, so that a reinforcing area is heterogeneous and anisotropic, meanwhile, under the load effect, the prefabricated pipe pile and the concrete outer pile layer can jointly bear the load effect, the overall strength is improved, and meanwhile the concrete outer pile layer expands the contact outer surface area of the pipe pile; the concrete outer pile layer is formed by directly pouring the concrete into the hole, so that the sinking of the concrete outer pile layer does not need to overcome additional resistance, and the designed length is achieved through the matching of the extension part and the prefabricated pipe pile.

Description

Technical Field

[0001] This application relates to the field of composite pile technology, and in particular to a precast composite pile with cast-in-place concrete. Background Technology

[0002] Pile foundations have been used in construction engineering since ancient times, and various materials have been used, such as wooden piles, stone piles, lime piles, rammed earth piles, and composite material piles; while at present, reinforced concrete piles are widely used. Pile foundations can reinforce the ground surface, thereby meeting construction requirements.

[0003] Currently, pile foundation construction generally requires drilling holes in the ground first. If the sand layer is thick and the hole is deep, serious hole collapse may occur.

[0004] At this point, the reinforcing steel bars of the bored pile are difficult to put into the already collapsed hole due to the large resistance of pile driving, so this type of pile cannot be used; if the pilot hole method is used, the hole will also collapse, and the length can only be improved, but often the effective pile length cannot be achieved. Utility Model Content

[0005] The purpose of this application is to provide a precast composite pile with cast-in-place concrete to improve the problem that traditional piles are prone to borehole collapse in yellow sand layers, resulting in piles not reaching the designed length.

[0006] This application provides a precast composite pile with externally cast concrete, which adopts the following technical solution:

[0007] An externally cast concrete precast composite pile includes a precast pipe pile; an outer concrete pile layer including an overlapping portion and an extension portion, wherein the overlapping portion is coaxially disposed outside the precast pipe pile, and the extension portion is connected to the overlapping portion and located at the bottom of the precast pipe pile.

[0008] By adopting the above technical solution, a concrete outer pile layer is poured at the bottom of the precast pipe pile to form a composite pile. This makes the reinforced zone heterogeneous and anisotropic. Under load, the precast pipe pile and the concrete outer pile layer can jointly bear the load, improving the overall strength. At the same time, the concrete outer pile layer expands the contact surface area of ​​the pipe pile and the contact surface between the pile and the soil, thereby increasing its frictional resistance. Since the concrete outer pile layer is formed by pouring concrete directly into the hole, the sinking of the concrete outer pile layer does not need to overcome additional resistance. The designed length is then achieved through the cooperation of the extension and the precast pipe pile.

[0009] Optionally, the circumferential dimension of the extension is greater than the circumferential dimension of the overlapping portion.

[0010] By adopting the above technical solution, the circumferential dimension of the extension is larger, which can increase the resistance to settlement and pull-out.

[0011] Optionally, the top surface of the overlapping portion is flush with the ground, and the top of the precast pipe pile protrudes from the overlapping portion.

[0012] By adopting the above technical solution, the top of the precast pipe pile extends out of the ground, which facilitates the installation of lifting tools and other equipment on the precast pipe pile.

[0013] Optionally, the bottom of the precast pipe pile is hinged with a steel cage, and multiple steel cages are provided along the circumference of the precast pipe pile.

[0014] By adopting the above technical solution, the bonding strength between the precast pipe pile and the concrete outer pile layer is increased by using steel cages.

[0015] Optionally, the reinforcing cage has a retracted state and an extended state. When the reinforcing cage is in the retracted state, it abuts against the side wall of the precast pipe pile; when the reinforcing cage is in the extended state, it abuts against the bottom of the precast pipe pile.

[0016] By adopting the above technical solution, when the precast pipe pile is driven into the hole, the bottom of the precast pipe pile bears a large pressure. Therefore, at this time, the steel cage is switched to the retracted state to avoid damage to the steel cage. After the precast pipe pile is driven, the steel cage is switched to the unfolded state to facilitate the bonding with the concrete outer pile layer.

[0017] Optionally, the precast pipe pile has a through hole along its own axial direction, and an adjustment rope is connected to the reinforcing cage. The end of the adjustment rope away from the reinforcing cage passes through the top of the precast pipe pile.

[0018] By adopting the above technical solution, the angle of the steel cage can be easily adjusted by adjusting the rope.

[0019] Optionally, the adjusting rope is moved to switch the steel cage panels between a retracted state and an extended state.

[0020] By adopting the above technical solution, the state of the steel cage can be switched even by adjusting the rope on the ground, thus improving convenience.

[0021] Optionally, when the reinforcing cage abuts against the bottom of the precast pipe pile, the reinforcing cage is parallel to the axis of the precast pipe pile.

[0022] Optionally, a hinge plate is connected to the reinforcing cage, and a hinge support is connected to the side wall of the precast pipe pile, wherein the hinge support is hinged to the hinge plate.

[0023] Optionally, a through hole is provided on the side wall of the precast pipe pile.

[0024] By adopting the above technical solution, the connecting hole facilitates the entry of some concrete into the precast pipe pile during concrete pouring, thereby further increasing the bonding strength between the precast pipe pile and the outer concrete pile layer.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. A concrete outer pile layer is poured at the bottom of the precast pipe pile to form a composite pile, making the reinforced zone heterogeneous and anisotropic. Under load, the precast pipe pile and the concrete outer pile layer can share the load, improving the overall strength. At the same time, the concrete outer pile layer expands the contact surface area of ​​the pipe pile and the contact surface between the pile and the soil, thereby increasing its frictional resistance. Since the concrete outer pile layer is formed by pouring concrete directly into the hole, the sinking of the concrete outer pile layer does not need to overcome additional resistance. The design length is achieved through the cooperation of the extension and the precast pipe pile.

[0027] 2. When the precast pipe pile is driven into the hole, the bottom of the precast pipe pile is under great pressure. Therefore, the steel cage is switched to the retracted state at this time to avoid damage to the steel cage. After the precast pipe pile is driven into the hole, the steel cage is switched to the unfolded state to facilitate bonding with the concrete outer pile layer.

[0028] 3. The state of the steel cage can be switched by adjusting the rope on the ground, which improves convenience. Attached Figure Description

[0029] Figure 1 This is a schematic diagram illustrating a precast composite pile with externally cast concrete in Embodiment 1 of this utility model.

[0030] Figure 2 This is a schematic diagram illustrating a precast composite pile with externally cast concrete in Embodiment 2 of this utility model.

[0031] In the figure, 1 is a precast pipe pile; 11 is a steel cage; 111 is a hinged plate; 12 is an adjusting rope; 13 is a connecting hole; 14 is a hinged support; 2 is an outer concrete pile layer; 21 is an overlapping part; and 22 is an extension part. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, 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, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances.

[0034] Example 1

[0035] A precast composite pile with cast-in-place concrete, referring to Figure 1 and Figure 2 The system comprises a precast pipe pile 1 and a concrete outer pile layer 2. The precast pipe pile 1 has a through hole along its axial direction. The concrete outer pile layer 2 includes an integrally formed overlapping portion 21 and an extension portion 22. The overlapping portion 21 is coaxially located outside the precast pipe pile 1, while the extension portion 22 is located at the bottom of the precast pipe pile 1. The circumferential dimension of the extension portion 22 is larger than that of the overlapping portion 21, which increases its resistance to settlement and pull-out. The top surface of the overlapping portion is flush with the ground, and the top of the precast pipe pile 1 protrudes beyond the overlapping portion 21. The top of the precast pipe pile 1 extends beyond the ground, facilitating the installation of lifting tools and other equipment on the precast pipe pile 1.

[0036] A concrete outer pile layer 2 is poured at the bottom of the precast pipe pile 1 to form a composite pile, making the reinforced area heterogeneous and anisotropic. Under load, the precast pipe pile 1 and the concrete outer pile layer 2 can jointly bear the load, improving the overall strength. At the same time, the concrete outer pile layer 2 expands the contact surface area of ​​the pipe pile and the contact surface between the pile and the soil, thereby increasing its frictional resistance. Since the concrete outer pile layer 2 is formed by pouring concrete directly into the hole, the sinking of the concrete outer pile layer 2 does not need to overcome additional resistance. The design length is achieved through the cooperation of the extension 22 and the precast pipe pile 1.

[0037] Example 2

[0038] The difference from Embodiment 1 is that the bottom of the precast pipe pile 1 is hinged with a steel cage 11, and multiple steel cages 11 are provided along the circumference of the precast pipe pile 1. The steel cages 11 increase the bonding strength between the precast pipe pile 1 and the concrete outer pile layer 2.

[0039] Specifically, the reinforcing cage 11 has a retracted state and an extended state. When the reinforcing cage 11 is in the retracted state, it abuts against the side wall of the precast pipe pile 1; when the reinforcing cage 11 is in the extended state, it abuts against the bottom of the precast pipe pile 1. A hinge plate 111 is fixedly connected to the reinforcing cage 11, and a hinge support 14 is fixedly connected to the side wall of the precast pipe pile 1. The hinge support 14 is hinged to the hinge plate 111, so that the reinforcing cage 11 can switch between the retracted and extended states. The hinge support 14 and the hinge plate 111 are interference-fitted, so that the reinforcing cage 11 can remain relatively fixed to the precast pipe pile 1 when no external force is applied.

[0040] When the precast pipe pile 1 is driven into the hole, the bottom of the precast pipe pile 1 bears a large pressure. Therefore, the steel cage 11 is switched to the retracted state at this time to avoid damage to the steel cage 11. After the precast pipe pile 1 is driven into the hole, the steel cage 11 is switched to the unfolded state to facilitate the combination with the concrete outer pile layer 2.

[0041] To facilitate the adjustment of the angle of the reinforcing cage 11, an adjusting rope 12 is fixedly connected to the reinforcing cage 11. The end of the adjusting rope 12 away from the reinforcing cage 11 passes through the top of the precast pipe pile 1. The adjusting rope 12 allows the reinforcing cage 11 to switch between the retracted and extended states on the ground, improving convenience.

[0042] It should be noted that when the reinforcing cage 11 abuts against the bottom of the precast pipe pile 1, the reinforcing cage 11 is parallel to the axis of the precast pipe pile 1. At this time, the abutment between the reinforcing cage 11 and the bottom of the precast pipe pile 1 prevents the reinforcing cage 11 from continuing to rotate.

[0043] In addition, a connecting hole 13 is provided through the side wall of the precast pipe pile 1. The connecting hole 13 facilitates the entry of some concrete into the precast pipe pile 1 during concrete pouring, so as to further increase the bonding strength between the precast pipe pile 1 and the concrete outer pile layer 2.

[0044] Working principle: When the precast pipe pile 1 is driven into the hole, the bottom of the precast pipe pile 1 bears a large pressure. Therefore, the steel cage 11 is switched to the retracted state at this time to avoid damage to the steel cage 11. After the precast pipe pile 1 is driven into the hole, the steel cage 11 is switched to the unfolded state to facilitate the combination with the concrete outer pile layer 2. The state of the steel cage 11 can also be switched on the ground by adjusting the rope 12, which improves convenience.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An externally poured concrete precast composite pile, characterized in that, The utility model relates to a prefabricated pipe pile (1) and a concrete outer pile layer (2) thereof. The concrete outer pile layer (2) comprises an overlapping part (21) and an extension part (22), wherein the overlapping part (21) is coaxially arranged outside the prefabricated pipe pile (1), and the extension part (22) is connected with the overlapping part (21) and located at the bottom of the prefabricated pipe pile (1). The circumferential dimension of the extension part (22) is greater than that of the overlapping part (21).

2. The cast-in-place concrete precast composite pile according to claim 1, characterized in that: The top surface of the overlapping part (21) is flush with the ground, and the top of the prefabricated pipe pile (1) protrudes from the overlapping part (21).

3. The composite pile according to claim 1, wherein: The prefabricated pipe pile (1) is hingedly connected with a plurality of steel cage pieces (11) along the circumference of the prefabricated pipe pile (1).

4. The cast-in-place concrete precast composite pile according to claim 2, characterized in that: The steel cage piece (11) has a retracted state and an expanded state, wherein when the steel cage piece (11) is in the retracted state, the steel cage piece (11) abuts against the side wall of the prefabricated pipe pile (1).

5. The cast-in-place concrete precast composite pile according to claim 4, characterized in that: When the steel cage piece (11) is in the expanded state, the steel cage piece (11) abuts against the bottom of the prefabricated pipe pile (1). A through hole is arranged in the prefabricated pipe pile (1) along the axial direction of the prefabricated pipe pile (1), and an adjusting rope (12) is connected to the steel cage piece (11), wherein one end of the adjusting rope (12) away from the steel cage piece (11) is arranged to pass through the top of the prefabricated pipe pile (1).

6. An in-situ cast concrete precast composite pile according to claim 5, wherein: The adjusting rope (12) is moved to switch the steel cage piece (11) between the retracted state and the expanded state.

7. An in-situ cast concrete precast composite pile according to claim 6, wherein: When the steel cage piece (11) abuts against the bottom of the prefabricated pipe pile (1), the steel cage piece (11) is parallel to the axis of the prefabricated pipe pile (1).

8. The cast-in-place concrete precast composite pile according to claim 7, characterized in that: A hinged plate (111) is connected to the steel cage piece (11), and a hinged support (14) is connected to the side wall of the prefabricated pipe pile (1), wherein the hinged support (14) is hinged to the hinged plate (111).

9. An in-situ cast concrete precast composite pile according to claim 8, wherein: A communication hole (13) is arranged through the side wall of the prefabricated pipe pile (1).

10. The cast-in-place concrete precast composite pile according to claim 9, characterized in that: ​

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