Combined pile for ground foundation engineering

Abstract

The utility model relates to the technical field of combined pile, disclose a combined pile for foundation engineering, including extruding pile and bearing capacity pile, still include the locking assembly and the occlusion part of setting at the tail of bearing capacity pile and extruding pile, through the setting of occlusion part, can be after the outer clamping curved surface is engaged in the guide bevel in the occlusion groove bottom, with the shear key of setting at the both sides of occlusion groove each other clamping, both avoided the stress concentration of installation deviation, and through the setting of shear key play the limiting action, strengthened the overall stability of combined pile. Through the setting of locking assembly, can realize the rigid mechanical connection of adjacent extruding pile and bearing capacity pile, cooperation occlusion part realized the collaborative anti -slip function between the pile body. Solveed the problem of easy reinforcement failure, low construction efficiency, existence security risk and high post -operation maintenance cost of traditional combined pile.

Description

Technical Field

[0001] This utility model belongs to the field of composite pile technology, specifically, it relates to a composite pile for foundation engineering. Background Technology

[0002] In traditional composite pile foundation construction, a step-by-step process of "compaction piles first, then bearing capacity piles" is commonly adopted. The specific process is as follows: first, compaction piles (such as gravel piles or sand piles) are used to densify the foundation soil, increasing its density and bearing capacity; then, high-strength bearing capacity piles (such as cast-in-place concrete piles or prestressed concrete pipe piles) are constructed in adjacent locations to transfer structural loads using their vertical bearing capacity. However, because the compaction piles cause lateral compression and disturbance to the surrounding soil, uneven stress distribution occurs in the borehole wall soil during the subsequent drilling of bearing capacity piles, leading to deviations in the borehole trajectory (e.g., ...). Figure 1 As shown in the diagram, this eventually forms an interlocking area with the sidewall of the adjacent compacted pile at the tail of the pile. While this asymmetrical spatial distribution of the piles can improve local stability through interlocking, it also introduces a potential risk of slippage into the pile foundation system.

[0003] To address the anti-slip requirements of the interlocking area at the pile tail, current engineering practices often employ a steel wire binding process for reinforcement. This involves manually or mechanically wrapping high-strength steel wire around the interlocking area of ​​the pile, utilizing its tensile strength to limit relative displacement. However, this approach has significant technical shortcomings: First, the tensile strength and durability of the steel wire are insufficient, making it prone to corrosion and embrittlement under long-term exposure to groundwater erosion and acidic / alkaline soil environments, leading to reinforcement failure. Second, the binding operation requires precise handling in confined spaces, resulting in low construction efficiency and safety hazards. Third, subsequent maintenance requires frequent inspections of the steel wire's corrosion status and replacement, leading to high operation and maintenance costs.

[0004] Based on this, the present invention proposes a composite pile for foundation engineering to solve the problems existing in the prior art. Utility Model Content

[0005] In view of this, the main purpose of this utility model is to provide a composite pile for foundation engineering, so as to solve the problems of traditional composite piles, such as easy reinforcement failure, low construction efficiency, safety hazards and high later operation and maintenance costs.

[0006] To achieve the above objectives, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A composite pile for foundation engineering includes a compaction pile and a bearing capacity pile, and further includes an interlocking portion and a locking assembly disposed at the tail ends of the bearing capacity pile and the compaction pile; wherein:

[0008] The interlocking part includes an interlocking groove pre-reserved on the side wall of the tail of the compaction pile, and the interlocking groove engages with the outer engaging curved surface provided at the tail of the bearing capacity pile;

[0009] The locking assembly includes a support arm, with steel pipes installed on both ends of the support arm. The steel pipes are connected to square inserts pre-embedded on the top surface of the bearing pile and the compaction pile tail end.

[0010] In a preferred embodiment, the outer engaging curved surface engages within the guide bevel at the bottom of the engagement groove and engages with the shear keys disposed on both sides of the engagement groove.

[0011] In a preferred embodiment, the axis of the steel pipe is perpendicular to the length direction of the support arm, and a threaded connection groove is provided on the steel pipe.

[0012] In a preferred embodiment, both the bearing capacity pile and the compaction pile have a square insertion hole reserved on the top surface of their tail ends, and the square insertion block is embedded in the insertion hole.

[0013] In a preferred embodiment, the square insert is provided with a threaded hole that matches the bolt hole in the socket.

[0014] In a preferred embodiment, both the threaded hole and the bolt hole are threadedly connected to the long rod bolt.

[0015] In a preferred embodiment, the inner diameter of the socket is larger than the outer dimensions of the square plug.

[0016] In a preferred embodiment, the inner wall of the insertion port adjacent to the pile connection side is a gradually expanding guide slope, and the square insertion block is provided with an outwardly convex slope of the same angle on one side corresponding to the guide slope, and the two are connected in a wedge-shaped nested connection.

[0017] Compared with the prior art, this utility model provides a composite pile for foundation engineering, which has the following beneficial effects:

[0018] 1. By setting an interlocking part at the tail of the bearing capacity pile and the compaction pile, the outer interlocking curved surface can be engaged with the guide bevel at the bottom of the interlocking groove and then engage with the shear keys set on both sides of the interlocking groove. This not only avoids stress concentration caused by installation deviation, but also enhances the overall stability of the composite pile by setting the shear keys to limit the movement.

[0019] 2. By setting the locking component, a rigid mechanical connection between adjacent compaction piles and bearing capacity piles can be achieved, and the interlocking part realizes the cooperative anti-slip function between the piles.

[0020] 3. Through the overall structural design of the composite piles used in this foundation engineering, after the compaction piles are driven into the foundation, the bearing piles are then driven into the foundation, with the tail of the bearing pile fitting into the interlocking groove opened on the side wall of the tail of the compaction pile, ensuring the interlocking relationship between the bearing pile and the compaction pile. Simultaneously, the square blocks at both ends of the support arm are inserted into the slots opened at the top of the bearing pile and the compaction pile, and then the long bolt is rotated to engage with the bolt hole, achieving the purpose of locking the component. This provides better fixation of the bearing pile and the tail of the compaction pile, preventing lateral slippage. Furthermore, the locking component can be made using scrap steel bars and pipes from the construction site, making it energy-saving and environmentally friendly. This solves the problems of traditional composite piles, such as easy reinforcement failure, low construction efficiency, safety hazards, and high subsequent operation and maintenance costs. Attached Figure Description

[0021] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 Schematic diagram of the wire binding structure for existing composite piles;

[0023] Figure 2 This is a schematic diagram of the combined pile structure of this utility model;

[0024] Figure 3 This utility model Figure 2 A magnified structural diagram at point A;

[0025] Figure 4 This is a schematic diagram of the locking mechanism of this utility model;

[0026] Figure 5 This is a schematic diagram showing the distribution of the locking mechanism of this utility model at the top of the bearing pile and the compaction pile;

[0027] Figure 6 This is a schematic diagram showing the distribution of bolt holes in the bearing capacity pile and compaction pile of this utility model.

[0028] [Explanation of Key Component Symbols]

[0029] 1. Bearing capacity pile; 2. Compaction pile; 3. Support arm; 4. Insertion; 5. Steel pipe; 6. Square insert; 7. Long bolt; 8. Bolt hole; 9. Steel wire; 10. External clamping curved surface; 11. Engagement groove; 12. Threaded connection groove. Detailed Implementation

[0030] The structure of the combined pile used in local foundation engineering will be further described in detail below with reference to the accompanying drawings and embodiments of this utility model.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments as described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 9 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] The following is combined with Figures 2 to 6 This invention describes the structure of a combined pile for foundation engineering.

[0036] A composite pile for foundation engineering includes a compaction pile 2 and a bearing pile 1, as well as an interlocking part and a locking component disposed at the tail of the bearing pile 1 and the compaction pile 2 for connection and anti-slip function. The bearing pile 1 and the compaction pile 2 form a spatial interlocking structure through the tail interlocking part, and achieve a cooperative anti-slip function in combination with the mechanical locking component. Specifically, the interlocking part adopts an "interlocking groove-curved surface" embedded design, including an interlocking groove 11 pre-reserved on the side wall of the tail of the compaction pile 2, and an outer locking curved surface 10 disposed at the tail of the bearing pile 1 that engages with the interlocking groove 11. The outer locking curved surface 10 engages in the guide bevel at the bottom of the interlocking groove 11 and engages with the shear keys disposed on both sides of the interlocking groove 11, which avoids stress concentration caused by installation deviation and enhances overall stability through the limiting setting of the shear keys. The locking assembly includes a support arm 3, with steel pipes 5 fixed to both ends of the support arm 3. One end of the steel pipe 5 is engaged with a square insert 6 pre-embedded on the top surface of the tail end of the bearing pile 1 and the compaction pile 2. This allows for a rigid mechanical connection between the adjacent compaction pile 2 and the bearing pile 1 by connecting the steel pipe 5 with the square insert 6 during use.

[0037] In the above description, the support arm 3, steel pipe 5 and square insert 6 can all be selected from any of the scrap steel bars, steel pipes or other metal parts available on the construction site.

[0038] In a preferred embodiment, such as Figures 2 to 6 As shown, the support arm 3 serves as a transverse connecting frame, employing an H-beam or box-section design to enhance bending stiffness. Its two ends are symmetrically welded with steel pipes 5 via continuous fillet welds. The steel pipes 5 are made of hollow, thick-walled alloy steel, with threaded connection grooves 12 machined on their inner sides. High-strength threads are tapped into the grooves and coated with anti-loosening adhesive to ensure reliable engagement with the bolts. Furthermore, the axis of the steel pipes 5 is arranged perpendicular to the length direction of the support arm 3, forming a cross-shaped force transmission node.

[0039] In a preferred embodiment, such as Figures 2 to 6 As shown, both the bearing pile 1 and the compaction pile 2 have square sockets 4 pre-drilled on their tail ends. The square insert 6 is embedded in the socket 4, and the two are fixed by shear pins. A continuous threaded hole is formed in the center of the insert 6, the diameter of which matches the diameter of the long bolt 7 and the bolt hole 8 located at the bottom of the socket 4. The inner wall of the hole is reinforced with a rolling process to enhance thread precision. The four corners of the insert 6 are chamfered to facilitate quick alignment and installation with the socket 4. Its outer surface is coated with an epoxy zinc-rich primer to enhance corrosion resistance.

[0040] During construction, the steel pipes 5 at both ends of the support arm 3 are aligned with the threaded holes of the insert blocks 6 at the ends of the two piles, and then the long bolts 7 are inserted. Bolts 7 feature a fully threaded rod structure with a torque-controlled hexagonal nut at the head, and the rod body is coated with Dacromet and wrapped with a polyethylene anti-rust sleeve. During tightening, bolts 7 pass through the steel pipes 5 and the threaded connection groove 12 and the threaded holes of the insert blocks. A preset torque value is applied using a hydraulic wrench, creating axial clamping force between the steel pipes 5 and the insert blocks 6, ultimately constructing a three-dimensional rigid connection system between the piles. This structure, through the combined effect of bolt shear resistance and support arm bending resistance, transforms lateral slippage force into system internal force, significantly improving the joint's resistance to lateral displacement. Compared to traditional wire binding processes, this structure, through the bolt-support arm system, can withstand megapascal-level tensile and compressive alternating loads, effectively improving the structure's anti-slip strength; the modular inserts 4 and standardized bolts 7 enable "alignment and locking" installation, effectively improving construction efficiency.

[0041] In a preferred embodiment, such as Figures 2 to 6 As shown, the insertion port 4 adopts a composite structure of "tolerance guidance + inclined self-locking". Its inner cavity diameter is slightly larger than the outer dimension of the insertion block 6, forming a transitional fit tolerance. This ensures that the insertion block 6 can be smoothly inserted while avoiding loosening of the gap due to soil vibration. The inner wall of the insertion port 4 adjacent to the pile connection side is processed into a gradually expanding guide slope; the corresponding position of the insertion block 6 is provided with an outwardly convex slope of the same angle, forming a "wedge nesting" geometric relationship. When the insertion block 6 is pushed in along the inclined surface of the insertion port 4, the gradually expanding structure generates a radial component force that forces the insertion block 6 to move closer to the central axis of the pile. At the same time, the frictional self-locking effect of the inclined surface suppresses rebound, ensuring that there is no relative displacement between the insertion block 6 and the pile during use.

[0042] In the above description, during construction, the operator aligns the inclined surface of the insert 6 with the inclined surface of the socket 4, and then applies an axial load using a hydraulic jacking device, causing the insert 6 to slide along the inclined surface to a preset depth. During this process, bidirectional compressive stress is generated at the contact surface between the insert 6 and the inclined surface of the socket 4: on the one hand, the normal pressure of the inclined surface presses the insert 6 tightly against the inner wall of the socket 4, forming static friction to resist transverse shear; on the other hand, the dimensional tolerance design of the socket 4 and the insert 6 ensures that after they are fully in place, the outer surface of the insert 6 forms a micro-gap pressure fit with the inner wall of the socket 4, further achieving full-area contact surface fit through elastic deformation. Furthermore, the bottom of the insert 6 is provided with shear pin holes, which can be welded to the internal steel reinforcement skeleton of the pile by driving in high-strength pins, achieving dual reinforcement through mechanical and chemical anchoring.

[0043] The implementation principle of the combined piles used in the foundation engineering described in this embodiment is as follows:

[0044] After the compaction pile 2 is driven into the foundation, the bearing pile 1 is driven into the foundation, and the tail of the bearing pile 1 fits into the interlocking groove 11 opened on the side wall of the tail of the compaction pile 2. Then, the square inserts 6 at both ends of the support arm 3 are inserted into the inserts 4 opened at the top of the bearing pile 1 and the compaction pile 2. Then, the long rod bolt 7 is rotated to engage with the bolt hole 8 to achieve the purpose of locking the component. In this way, the fixing measures of the bearing pile 1 and the tail of the compaction pile 2 are better, and side slippage will not occur. Moreover, the locking component can be made using scrap steel bars and steel pipes on the construction site, which is energy-saving and environmentally friendly.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A composite pile for foundation engineering, comprising compaction piles (2) and bearing capacity piles (1), characterized in that, It also includes an interlocking part and a locking assembly disposed at the tail of the bearing pile (1) and the compaction pile (2); wherein: The interlocking part includes an interlocking groove (11) pre-reserved on the side wall of the tail of the compaction pile (2), and the interlocking groove (11) interlocks with the outer engaging curved surface (10) provided at the tail of the bearing pile (1); The locking assembly includes a support arm (3), and steel pipes (5) are provided on both ends of the support arm (3). The steel pipes (5) are connected to square inserts (6) pre-embedded on the top surface of the tail end of the bearing pile (1) and the compaction pile (2).

2. The composite pile for foundation engineering as described in claim 1, characterized in that, The outer engagement surface (10) engages within the guide bevel at the bottom of the engagement groove (11) and engages with the shear keys located on both sides of the engagement groove (11).

3. A composite pile for foundation engineering as described in claim 1, characterized in that, The axis of the steel pipe (5) is perpendicular to the length direction of the support arm (3), and a threaded connection groove (12) is provided on the steel pipe (5).

4. A composite pile for foundation engineering as described in claim 1, characterized in that, The top surface of the tail end of the bearing pile (1) and the compaction pile (2) is reserved with a square socket (4), and the square plug (6) is embedded in the socket (4).

5. A composite pile for foundation engineering as described in claim 4, characterized in that, The square insert (6) is provided with threaded holes that match the bolt holes (8) on the socket (4).

6. A composite pile for foundation engineering as described in claim 5, characterized in that, Both the threaded hole and the bolt hole (8) are threadedly connected to the long rod bolt (7).

7. A composite pile for foundation engineering as described in claim 4, characterized in that, The inner diameter of the socket (4) is larger than the outer dimensions of the square plug (6).

8. A composite pile for foundation engineering as described in claim 7, characterized in that, The inner wall of the insertion port (4) adjacent to the pile body connection side is a gradually expanding guide slope, and the square insertion block (6) is provided with an outward convex slope of the same angle on one side of the guide slope, and the two are connected in a wedge-shaped nested connection.

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