Sleeve type prefabricated bamboo pile structure

Abstract

This application belongs to the field of precast bamboo pile structures and discloses a sleeve-type precast bamboo pile structure, including a central bamboo pile and branch bamboo piles. The central bamboo pile is vertically inserted into the soil to bear vertical loads; the branch bamboo piles are inserted into the soil at a predetermined angle, with the lower end embedded and connected to the central bamboo pile, and the upper end extending outward in a direction away from the central axis of the central bamboo pile, thus forming a spatial force-bearing system. The inclined branch bamboo piles are equivalent to setting rigid barbs on the central bamboo pile in terms of mechanical transmission, and work together to create an "inverted cone soil locking" effect. When the pile is subjected to an upward pull force, the pressure exerted by each branch bamboo pile on the soil above and around it forces the pile foundation area to form an inverted cone-shaped soil plug or soil compression zone. Based on this mechanical mechanism, to pull out the pile, the self-weight and cohesion of the inverted cone-shaped soil must first be overcome, thereby significantly consuming the pull-out force and greatly improving the pull-out bearing capacity of the pile foundation.

Description

Technical Field

[0001] This application belongs to the field of precast bamboo pile structure technology, and more specifically, relates to a sleeve-type precast bamboo pile structure. Background Technology

[0002] Traditional prestressed concrete pipe piles or bored cast-in-place piles typically have a circular cross-section. This means that the interaction between the pile and the surrounding soil relies primarily on interfacial friction to transmit lateral frictional resistance. When resisting uplift forces, this frictional force transmission mechanism presents several challenges. First, the limited interfacial frictional force rapidly diminishes after a small relative displacement between the pile and the soil, making the pile foundation highly susceptible to failure in soft soil foundations or under tensile or lateral forces. Second, significantly increasing the pile diameter or length to meet design requirements often results in enormous consumption of building materials such as concrete. Furthermore, due to the geometric characteristics of the circular cross-section, its performance in resisting uplift and horizontal forces remains inherently weak, making it difficult to adapt to increasingly complex load conditions. Utility Model Content

[0003] This application provides a sleeve-type prefabricated bamboo pile structure to solve the technical problem of insufficient pull-out resistance of pile foundations in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] A sleeve-type prefabricated bamboo pile structure is provided, comprising:

[0006] A central bamboo stake is used to vertically insert into the soil; the side wall of the central bamboo stake has pre-set installation holes; and

[0007] At least one branch bamboo stake is inserted into the soil at an angle to the central bamboo stake, with the lower end of the branch bamboo stake inserted into the mounting hole of the central bamboo stake, and the upper end of the branch bamboo stake extending in a direction away from the central bamboo stake.

[0008] As a further improvement to the above technical solution:

[0009] Optionally, each of the branch bamboo stakes is arranged along the axial direction and / or circumferential direction of the central bamboo stake.

[0010] Optionally, a plurality of branch bamboo pile groups are provided along the axial direction of the central bamboo pile, and each branch bamboo pile group includes a plurality of branch bamboo piles arranged along the circumference of the central bamboo pile.

[0011] Optionally, the lengths of the branch bamboo stakes in each of the branch bamboo stake groups increase in the direction from the top to the bottom of the central bamboo stake.

[0012] Optionally, each of the branch bamboo stakes is spaced apart from the central bamboo stake in both the axial and circumferential directions.

[0013] Optionally, the central bamboo pile includes an inner bamboo pile and an outer bamboo pile sleeved on the outside of the inner bamboo pile, with a grouting space between the inner bamboo pile and the outer bamboo pile for pouring filler.

[0014] Optionally, the central bamboo stake further includes multiple sets of positioning components arranged sequentially along the axial direction of the central bamboo stake. Each positioning component includes at least two positioning members. The extension direction of the positioning members intersects with the axial direction of the outer bamboo stake, and both ends of the positioning members are inserted into the outer bamboo stake.

[0015] The two positioning members of the same group of positioning components are arranged parallel to each other and spaced apart, and a space is formed between the two positioning members for the inner bamboo pile to pass through and clamp the inner bamboo pile;

[0016] The extending directions of the positioning elements of the adjacent group of positioning components intersect each other, and the inner bamboo piles pass through the space between the positioning elements of each group of positioning components in sequence to position the inner bamboo piles.

[0017] Optionally, the diameter of the branch bamboo stake is smaller than that of the central bamboo stake.

[0018] Optionally, a cover plate is also included, which is disposed at the top of the central bamboo pile. The cover plate is provided with a plurality of guide holes, and the branch bamboo piles are inserted into the soil layer along the guide holes and connected to the central bamboo pile.

[0019] Optionally, the bottom end of the central bamboo stake is cone-shaped.

[0020] Compared with the prior art, the beneficial effects of this application are as follows:

[0021] The sleeve-type precast bamboo pile structure provided in this application includes a central bamboo pile and branch bamboo piles. The central bamboo pile, as the main load-bearing component, is vertically inserted into the soil to bear vertical loads. The number of branch bamboo piles can be set to one or more according to design requirements. They are inserted into the soil at a predetermined angle, with the lower end embedded and connected to the central bamboo pile, and the upper end extending outward in a direction away from the central axis of the central bamboo pile, thus forming a spatial load-bearing system. The inclined branch bamboo piles, in terms of mechanical transmission, are equivalent to having rigid barbs on the central bamboo pile, collaboratively constructing an "inverted cone soil-locking" effect. When the pile is subjected to an upward pull-out force, the pressure exerted by each branch bamboo pile on the soil above and around it forces the pile foundation area to form an inverted cone-shaped soil plug or soil compression zone. Based on this mechanical mechanism, to pull out the pile, the self-weight and cohesion of this inverted cone-shaped soil must first be overcome, thus significantly consuming the pull-out force and greatly improving the pull-out bearing capacity of the pile foundation. Attached Figure Description

[0022] 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. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional structural schematic diagram of the sleeve-type prefabricated bamboo pile structure of this application;

[0024] Figure 2 This is a partial structural schematic diagram of the central bamboo pile of the sleeve-type prefabricated bamboo pile structure of this application;

[0025] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0026] Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure at point BB;

[0027] Figure 5 This is a schematic cross-sectional view of the positioning component of the sleeve-type prefabricated bamboo pile structure of this application.

[0028] The following are the labeling elements in the figure:

[0029] 1. Central bamboo pile; 11. Inner bamboo pile; 12. Outer bamboo pile; 13. Grouting space; 14. Positioning component; 141. Positioning element; 1411. First positioning element; 1412. Second positioning element;

[0030] 2. Branch bamboo stake; 21. First branch bamboo stake; 22. Second branch bamboo stake; 5. Cover plate; 51. Guide hole. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0034] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0036] like Figure 1 , Figure 3 and Figure 4 As shown, this application provides a sleeve-type prefabricated bamboo pile structure, which mainly includes a central bamboo pile 1 and branch bamboo piles 2.

[0037] The central bamboo pile 1, serving as the primary load-bearing component, is vertically inserted into the soil to bear vertical loads. Before the precast bamboo pile structure is driven into the ground, the soil is first stirred using a drill bit to create pre-drilled holes, and then the central bamboo pile 1 is inserted. Several installation holes are pre-machined on the side wall of the central bamboo pile 1. Branch bamboo piles 2 are inserted into the soil at a predetermined angle. The lower end of the branch bamboo pile 2 is inserted into the corresponding installation hole on the central bamboo pile 1, while the upper end extends outward in a direction away from the central axis of the central bamboo pile 1, thus forming a spatial load-bearing system. The number of branch bamboo piles 2 can be set to one or more according to design requirements.

[0038] To further enhance pile-soil interaction, both the central bamboo pile 1 and the branch bamboo piles 2 retain protruding ring ribs on their outer walls, forming a bamboo-joint-like physical interface. This bamboo-joint structure effectively increases the mechanical contact area between the pile and the soil. Furthermore, the inclined branch bamboo piles 2, in terms of mechanical transmission, are equivalent to having rigid barbs on the central bamboo pile 1, collaboratively creating an "inverted cone soil-locking" effect. When the pile is subjected to an upward pull-out force, the pressure exerted by each branch bamboo pile 2 on the soil above and around it forces the formation of an inverted cone-shaped soil plug or soil compression zone in the pile foundation area. Based on this mechanical mechanism, to pull out the pile, the self-weight and cohesion of this inverted cone-shaped soil must first be overcome, thus significantly consuming the pull-out force and greatly improving the pile foundation's tensile bearing capacity.

[0039] like Figure 1 As shown, in some specific embodiments of this application, the spatial distribution configuration of each branch bamboo pile 2 relative to the central bamboo pile 1 can be adapted in multiple dimensions to meet the bearing requirements under different geological conditions and load conditions. Specifically, each branch bamboo pile 2 can be set along the axial direction of the central bamboo pile 1, that is, multiple branch bamboo piles 2 are arranged in layers at different vertical heights and connected to the central bamboo pile 1 through the mounting holes on the side wall, thereby forming a hierarchical anchoring structure in the longitudinal direction of the pile body. Alternatively, each branch bamboo pile 2 can be set along the circumferential direction of the central bamboo pile 1, that is, each branch bamboo pile 2 is connected to the same height position of the central bamboo pile 1, but is distributed in a circular array around its central axis. Furthermore, each branch bamboo pile 2 can also be combined with the axial and circumferential arrangement, that is, branch bamboo piles 2 are set at different height positions and different circumferential orientations of the central bamboo pile 1, so as to maximize the pile-soil contact area and mechanical interlocking effect within the limited pile length.

[0040] In addition, each branch bamboo pile 2 can be extended along the outer wall of the central bamboo pile 1 in a spiral trajectory (not shown in the figure). The spiral angle is used to continuously change the cutting depth and spatial orientation of the branch bamboo pile 2, thereby enhancing the bonding strength between the pile and the soil.

[0041] like Figure 1 As shown, in some specific embodiments of this application, multiple branch bamboo pile groups are arranged at intervals from top to bottom along the axial direction of the central bamboo pile 1. For example... Figure 1As shown in the first branch bamboo pile 21 and the second branch bamboo pile 22, each branch bamboo pile group contains multiple branch bamboo piles 2. Each branch bamboo pile 2 in the group is evenly distributed along the circumference of the central bamboo pile 1 with its lower end as the connecting end, and is connected to its internal cavity through the installation hole on the side wall of the central bamboo pile 1. In the actual construction, the branch bamboo pile groups located at different axial heights can be arranged in a staggered or aligned manner to form a multi-layered radial anchoring structure around the pile body, thereby achieving segmented and layered reinforcement of the soil around the pile in the vertical direction, further improving the overall stability and tensile bearing capacity of the pile-soil composite system.

[0042] like Figure 1 As shown in some specific embodiments of this application, multiple branch bamboo pile groups are arranged sequentially at intervals along the axial direction extending from the top to the bottom of the central bamboo pile 1. The axial length of each branch bamboo pile 2 within the branch bamboo pile group at a lower elevation increases progressively compared to the branch bamboo pile group at a higher elevation. Specifically, the branch bamboo pile 2 near the top of the central bamboo pile 1 is shorter, and as the depth increases, the insertion length and cantilever span of the branch bamboo pile 2 gradually increase, thereby forming a more extensive inverted cone-shaped reinforcement area at the bottom of the pile body.

[0043] like Figure 1 As shown in some specific embodiments of this application, each branch bamboo pile 2 is arranged in an array relative to the central bamboo pile 1 in three-dimensional space. Specifically, it maintains a preset interval distance in both the axial direction and the circumferential direction along the central bamboo pile 1. Specifically, at the axial height of the central bamboo pile 1, each branch bamboo pile 2 is divided into multiple groups, and each group maintains a non-contact interlayer spacing along the longitudinal direction of the pile body. At the same time, on the horizontal section at the same axial height, each branch bamboo pile 2 belonging to the same group is arranged in a circumferential array around the central axis of the central bamboo pile 1, maintaining a certain circumferential angle between them. This arrangement method, which is discretized in both the axial and circumferential directions, aims to enable each branch bamboo pile 2 to independently form an interlocking effect with the surrounding soil, avoiding stress concentration or soil arching failure caused by excessive spacing, thereby constructing a uniform and continuous composite force system throughout the entire length of the pile body.

[0044] like Figure 1 and Figure 2As shown in some specific embodiments of this application, the central bamboo pile 1 adopts a double-layer sleeve composite structure, specifically including an inner bamboo pile 11 and an outer bamboo pile 12 sleeved outside the inner bamboo pile 11. An installation hole is provided in the outer bamboo pile 12, and the lower end of the branch bamboo pile 2 passes through the installation hole through the outer bamboo pile 12 and then abuts against the inner bamboo pile 11. An annular grouting space 13 is defined between the inner bamboo pile 11 and the outer bamboo pile 12. This grouting space 13 is used to pour concrete filler after assembly, thereby achieving the consolidation and coordinated stress distribution of the inner and outer bamboo piles. The inner bamboo pile 11 is constructed as a through hollow bamboo tube with all internal bamboo nodes removed, and its internal cavity is used to fill concrete to form a core reinforcement. The outer bamboo pile 12 is a hollow bamboo tube with only the bottommost internal bamboo node retained and all other bamboo nodes removed. The retained bottommost bamboo node serves as a support step in the axial direction to support and position the bottom of the inner bamboo pile 11 inserted therein. At the same time, the open cavity structure facilitates the insertion and installation of the inner bamboo pile 11.

[0045] like Figure 1 and Figure 5 As shown, in some specific embodiments of this application, the central bamboo pile 1 further includes multiple sets of positioning components 14 arranged at intervals along its axial direction. Each set of positioning components 14 consists of at least two positioning elements 141. The extension direction of each positioning element 141 is non-parallel to the central axis of the outer bamboo pile 12, preferably orthogonal to the central axis of the outer bamboo pile 12, that is, the extension direction of the positioning element 141 is horizontal. Before inserting the outer bamboo pile 12 into the soil, the two ends of the positioning element 141 are respectively penetrated and firmly inserted into the inner wall of the outer bamboo pile 12, thereby forming a stable anchoring point in the radial direction of the outer bamboo pile 12. The positioning element 141 can be made of bamboo strips.

[0046] like Figure 5 As shown, in the same set of positioning components 14, the two positioning members 141 are kept parallel to each other and have a preset distance. The gap between the two positioning members 141 can provide a limiting space for the inner bamboo pile 11 to pass through and be centered. The outer wall of the inner bamboo pile 11 and the two positioning members 141 form a clamping relationship to limit the position of the inner bamboo pile 11 within the outer bamboo pile 12.

[0047] Furthermore, the extension directions of the first positioning element 1411 and the second positioning element 1412 in the two adjacent sets of positioning components 14 intersect each other, forming a spatially interlocked constraint structure. During the axial insertion process, the inner bamboo pile 11 passes through the limiting space between the first positioning element 1411 and the second positioning element 1412 in each set of positioning components 14 in sequence. Through the radial limiting action of multiple points and multiple angles, the precise calibration and fixation of the inner bamboo pile 11 in spatial position is achieved.

[0048] In other specific embodiments of this application, the first positioning member 1411 and the second positioning member 1412 may also be disposed in the same group of positioning components 14. The difference from the above embodiment is that the first positioning member 1411 and the second positioning member 1412 are spaced further apart in the vertical direction and can be disposed close together to form in the same group of positioning components 14.

[0049] like Figure 1 As shown, in some specific embodiments of this application, the radial cross-sectional dimension of the branch bamboo pile 2 is smaller than that of the central bamboo pile 1. Specifically, the outer diameter or equivalent diameter of the branch bamboo pile 2 is set as a preset proportion of the outer diameter of the central bamboo pile 1, and this proportion is determined based on the design load on the pile and the soil mechanical parameters. By setting the diameter of the branch bamboo pile 2 to be smaller than that of the central bamboo pile 1, on the one hand, the construction resistance of the branch bamboo pile 2 during the implantation process can be effectively reduced, and excessive disturbance to the soil around the pile can be reduced, thereby ensuring the original structural strength of the soil around the central bamboo pile 1; on the other hand, this diameter differentiation design allows the radial radiation range of the branch bamboo pile 2 to be maximized with a limited amount of pile material, thereby constructing a pile-soil composite reinforcement zone with a larger envelope diameter in the horizontal direction, and thus optimizing the overall mechanical performance of the pile foundation.

[0050] like Figure 1 and Figure 3 As shown in some specific embodiments of this application, the sleeve-type precast bamboo pile structure also includes a cover plate 5 disposed at the top of the central bamboo pile 1. This cover plate 5 is typically made of cast-in-place concrete, and its main function is to bear the load from the superstructure and transfer it to the pile section of the central bamboo pile 1, thereby effectively reducing the local compressive stress at the top of the pile and preventing the top of the pile from splitting or breaking under load. To further standardize the construction positioning of the branch bamboo piles 2, several guide holes 51 are pre-set on the upper surface of the cover plate 5. The position and angle of each guide hole 51 are pre-marked according to design requirements. During construction, the upper end of the branch bamboo pile 2 passes through the guide hole 51 and is inserted obliquely into the soil layer along the pre-set trajectory. Subsequently, its end is fixedly connected to the side wall of the central bamboo pile 1, thereby using the cover plate 5 as a construction reference surface to ensure that the spatial posture of each branch bamboo pile 2 is consistent with the geometric parameters of the structural design.

[0051] When installing the central bamboo pile 1, the outer bamboo pile 12 is first hoisted into the deep hole pre-drilled in the soil. Then, the inner bamboo pile 11 is inserted into the outer bamboo pile 12 along the limiting space defined by each group of positioning components 14. Then, the branch bamboo pile 2 is inserted into the central bamboo pile 1 along the guide hole 51 and the hole pre-drilled in the soil. The lower end of the branch bamboo pile 2 passes through the installation hole through the outer bamboo pile 12 and supports the inner bamboo pile 11. Then, concrete is injected into the grouting space 13 for curing.

[0052] like Figure 1As shown in some specific embodiments of this application, the bottom end of the central bamboo pile 1 is constructed as a pointed cone structure. This pointed cone structure is specifically formed by the intersection of the outer walls of the bottom end of the central bamboo pile 1, and its apex angle is preset according to the geological conditions of the soil layer and the construction penetration resistance. During the operation of implanting this bamboo pile structure into the soil layer, this pointed cone structure can effectively concentrate the self-weight of the pile and the external construction force, thereby guiding the pile to penetrate directionally along the design axis, while reducing excessive compression and disturbance to the soil below the pile end, ensuring the vertical accuracy of the pile placement.

[0053] In some specific embodiments of this application, to address the chemical erosion and biodegradation effects of complex geological environments on biomass materials, an anti-corrosion material layer is applied to the inner and outer surfaces of the inner bamboo pile 11, the outer bamboo pile 12, and each branch bamboo pile 2. Specifically, this anti-corrosion material layer is formed by brushing or impregnating the bamboo surface with an environmentally friendly anti-corrosion coating. The coating process can be completed during the prefabrication stage of the bamboo pile components or by reinforcement treatment before assembly at the construction site. This anti-corrosion material layer aims to block direct contact between groundwater, soil acid and alkaline media, and microorganisms and bamboo fibers, thereby significantly improving the corrosion resistance and service life of each bamboo pile component and ensuring the durability and stability of the pile foundation structure under long-term service conditions.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sleeve-type prefabricated bamboo pile structure, characterized in that, include: A central bamboo stake (1) is used to be vertically inserted into the soil; the side wall of the central bamboo stake (1) is pre-drilled with mounting holes; and At least one branch bamboo stake (2) is inserted into the soil at an angle to the central bamboo stake (1). The lower end of the branch bamboo stake (2) is inserted into the mounting hole of the central bamboo stake (1), and the upper end of the branch bamboo stake (2) extends in a direction away from the central bamboo stake (1).

2. The sleeve-type precast bamboo pile structure according to claim 1, characterized in that, Each of the branch bamboo stakes (2) is arranged along the axial direction and / or circumferential direction of the central bamboo stake (1).

3. The sleeve-type precast bamboo pile structure according to claim 2, characterized in that, Multiple branch bamboo pile groups are provided along the axial direction of the central bamboo pile (1), and each branch bamboo pile group includes multiple branch bamboo piles (2) arranged along the circumferential direction of the central bamboo pile (1).

4. The sleeve-type precast bamboo pile structure according to claim 3, characterized in that, Along the direction from the top to the bottom of the central bamboo stake (1), the length of the branch bamboo stakes (2) of each branch bamboo stake group increases.

5. The sleeve-type precast bamboo pile structure according to claim 3, characterized in that, Each of the branch bamboo stakes (2) is spaced apart from the central bamboo stake (1) in both the axial and circumferential directions.

6. The sleeve-type precast bamboo pile structure according to any one of claims 1 to 5, characterized in that, The central bamboo pile (1) includes an inner bamboo pile (11) and an outer bamboo pile (12) sleeved on the outside of the inner bamboo pile (11). The space between the inner bamboo pile (11) and the outer bamboo pile (12) is a grouting space (13) for pouring filler.

7. The sleeve-type precast bamboo pile structure according to claim 6, characterized in that, The central bamboo stake (1) also includes multiple sets of positioning components (14) arranged sequentially along the axial direction of the central bamboo stake (1). The positioning components (14) include at least two positioning elements (141). The extension direction of the positioning elements (141) intersects with the axial direction of the outer bamboo stake (12), and both ends of the positioning elements (141) are inserted into the outer bamboo stake (12). The two positioning members (141) of the same group of positioning components (14) are arranged parallel to each other and spaced apart, and a space is formed between the two positioning members (141) for the inner bamboo pile (11) to pass through and clamp the inner bamboo pile (11); The extension directions of the positioning elements (141) of the adjacent group of positioning components (14) intersect each other, and the inner bamboo pile (11) passes through the space between the positioning elements of each group of positioning components (14) in sequence to position the inner bamboo pile (11).

8. The sleeve-type precast bamboo pile structure according to any one of claims 1 to 5, characterized in that, The diameter of the branch bamboo stake (2) is smaller than that of the central bamboo stake (1).

9. The sleeve-type precast bamboo pile structure according to any one of claims 1 to 5, characterized in that, It also includes a cover plate (5), which is located at the top of the central bamboo pile (1). The cover plate (5) has several guide holes (51). The branch bamboo piles (2) are inserted into the soil along the guide holes (51) and connected to the central bamboo pile (1).

10. The sleeve-type precast bamboo pile structure according to any one of claims 1 to 5, characterized in that, The bottom end of the central bamboo stake (1) is cone-shaped.

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