Variable cross-section prefabricated part and pile splicing structure
By designing rounded corners and grooves in variable sections in prefabricated components, the problem that existing square piles cannot effectively utilize the soil shear strength under friction pile conditions is solved, and higher bearing capacity and shorter Pile length reduces project costs and resource waste.
Patent Information
- Application Number
- CN202421013332.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-10
AI Technical Summary
The existing square pile design cannot effectively utilize the shear strength of the soil under friction pile conditions, resulting in longer pile lengths to increase friction resistance and increase engineering costs and waste of resources.
Variable cross-section prefabricated components are adopted, including square pile sections and variable cross-section sections arranged along their length direction. The four corners of the variable cross-section section are designed as rounded corners to form a groove missing to allow the soil to be embedded and improve the pull-out resistance and bearing capacity.
By utilizing the shear strength of the soil, the bearing capacity of a single pile is improved, the pile length is shortened under the same bearing capacity design requirements, the engineering cost is reduced, and resource waste is reduced.
Smart Images
Figure CN222456051U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of prefabricated concrete components, in particular to a prefabricated component with a variable cross-section and a pile connection structure. Background Art
[0002] With the rapid development of urban construction in my country, prestressed concrete piles are widely used in key areas of infrastructure construction such as industrial and civil buildings, municipal bridges, and highways. The common cross-sections of precast piles are mostly round and square.
[0003] In order to pursue the characteristics of large side friction resistance of square piles and break through the limitations of prefabricated pile forming mold technology, the common square piles on the market are basically of the same size cross-section. The pile body design of the same cross-section cannot utilize the shear strength of the soil around the pile itself, and the shear strength of the same soil is much greater than the friction resistance provided by the relative sliding between the pile body and the soil. Under the friction pile working condition, the pile type design of the same cross-section requires a longer pile length to increase the pile body friction resistance to meet the bearing capacity requirements. The increase in pile length will not only increase the project cost but also cause a waste of resources. Utility Model Content
[0004] The utility model provides a variable-section prefabricated component and a pile connection structure. When used in a friction pile working condition, under the same bearing capacity design requirement, the pile length can be shortened, thereby reducing the project cost and reducing resource waste.
[0005] In order to solve the above problems, the utility model adopts the following technical solutions:
[0006] According to the first aspect of the utility model, an embodiment of the utility model provides a variable-section prefabricated component, including a pile body and a steel cage buried in the pile body, the pile body including a plurality of square pile segments and a plurality of variable-section segments arranged along its length direction, the cross-sectional shape of the square pile segment is a square, and the cross-sectional shape of the variable-section segment is a square with rounded corners at all four corners, so as to form notches at the four corners of the variable-section segment.
[0007] In some embodiments, the steel cage includes a plurality of main bars and stirrups, the main bars are distributed in a circular shape relative to the center of the pile body, and the stirrups are wound around the outside of the main bars.
[0008] In some embodiments, the four side surfaces of the variable cross-section segment are respectively connected to the four side surfaces of the square pile segment, and the four side surfaces of the variable cross-section segment and the four side surfaces of the square pile segment are respectively located on the same vertical plane.
[0009] In some embodiments, the square pile segment and the variable cross-section segment are each provided with one, and the square pile segment and the variable cross-section segment are connected to each other; or, the square pile segment is provided with two, and the variable cross-section segment is provided with one, and the two square pile segments are respectively located at both ends of the variable cross-section segment and are both connected to the variable cross-section segment; or, the square pile segment and the variable cross-section segment are each provided with multiple, and the square pile segments and the variable cross-section segments are arranged at intervals along the length direction of the pile body and are connected in sequence.
[0010] In some embodiments, end plates are fixed to both ends of the pile body, and both ends of the main reinforcement are anchored and fixed to the two end plates respectively.
[0011] According to the second aspect of the utility model, an embodiment of the utility model provides a pile connection structure, comprising two variable-section prefabricated components as described in any one of the first aspects above, wherein one variable-section prefabricated component is located above the other variable-section prefabricated component; an upper end plate is fixed to the bottom surface of the pile body located above, and a lower end plate is fixed to the top surface of the pile body located below, and the upper end plate and the lower end plate are welded and fixed.
[0012] According to the third aspect of the utility model, an embodiment of the utility model provides a pile connection structure, comprising two variable-section prefabricated components described in any one of the first aspects above, wherein one variable-section prefabricated component is located above the other variable-section prefabricated component; a downwardly extending insertion rod is fixed to the bottom of the pile body located above, a snap-on tube is sleeved on the insertion rod, and the snap-on tube has elastic fins that can be radially opened outward or contracted inward; a lower sleeve is fixed to the top of the pile body located below, and a convex ring is provided on the inner wall of the lower sleeve; during the process of inserting the insertion rod into the lower sleeve, the elastic fins contract inwardly to allow the snap-on tube to pass through the convex ring, and after the snap-on tube passes through the convex ring, the elastic fins open outwardly to snap into the convex ring.
[0013] In some embodiments, an upper sleeve is embedded in the bottom of the upper pile body, the main reinforcement in the upper pile body is anchored to the upper sleeve, and the upper end of the insertion rod is fixed in the upper sleeve; the main reinforcement in the lower pile body is anchored to the lower sleeve.
[0014] In some embodiments, the insertion rod is threadedly connected to the upper sleeve, and the buckle tube is threadedly connected to the insertion rod.
[0015] According to the fourth aspect of the utility model, an embodiment of the utility model provides a pile connection structure, comprising two variable-section prefabricated components described in any one of the first aspects above, wherein one variable-section prefabricated component is located above the other variable-section prefabricated component; an upper end plate is fixed to the bottom surface of the pile body located above, and a plug rod extending downward is fixed to the upper end plate, and a snap tube is sleeved on the plug rod, and the snap tube has elastic fins that can be radially opened outward or contracted inward; a lower end plate is fixed to the top surface of the pile body located below, and the lower end plate is provided with a through hole passing through, and the top surface of the pile body located below is provided with a lower connecting hole docking with the through hole, and the aperture of the through hole is smaller than the aperture of the lower connecting hole; in the process of inserting the plug rod into the through hole, the elastic fin contracts inwardly to allow the snap tube to pass through the lower end plate, and after the snap tube passes through the lower end plate, the elastic fin opens outwardly to snap with the lower end plate.
[0016] In some embodiments, the insertion rod is threadedly connected to the upper end plate, and the buckle tube is threadedly connected to the insertion rod.
[0017] In some embodiments, the main reinforcement in the upper pile body is anchored to the upper end plate, and the main reinforcement in the lower pile body is anchored to the lower end plate.
[0018] The utility model has at least the following beneficial effects: the utility model comprises a plurality of square pile segments and a plurality of variable cross-section segments arranged along its length direction, the cross-sectional shape of the square pile segment is a square, and the cross-sectional shape of the variable cross-section segment is a square with rounded corners at all four corners, so that notches are formed at the four corners of the variable cross-section segment; when used in friction pile working conditions, the soil around the pile will be embedded in the notch of the pile body to wrap the entire pile body, and if the pile is to resist pull-out and rise or bear pressure and fall, the soil in the notch needs to be sheared and destroyed first, and the pile body can be pulled out or pressed down, which makes full use of the characteristic that the shear strength of the soil is much greater than the friction resistance provided by the relative sliding between the pile body and the soil, greatly improving the bearing capacity of a single pile, and under the same bearing capacity design requirements, the pile length can be shortened, thereby reducing the project cost and reducing resource waste. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic structural diagram of a variable cross-section prefabricated component according to an embodiment of the utility model;
[0020] Figure 2 For along Figure 1 A schematic cross-sectional view of the section taken along the AA section line;
[0021] Figure 3 For along Figure 1 A schematic cross-sectional view of the section line BB in the middle;
[0022] Figure 4 This is a structural schematic diagram of a variable-section prefabricated component of another embodiment of the utility model;
[0023] Figure 5 This is a structural schematic diagram of a variable cross-section prefabricated component of another embodiment of the utility model;
[0024] Figure 6 This is a structural schematic diagram of a pile connection structure according to an embodiment of the utility model;
[0025] Figure 7 for Figure 6 The enlarged schematic diagram of point A in the middle;
[0026] Figure 8 It is a structural schematic diagram of a pile connection structure according to another embodiment of the utility model.
[0027] Wherein, the accompanying drawings are marked as follows:
[0028] A pile body 100, an upper pile section 101, a lower pile section 102, a lower connecting hole 103, a square pile section 110, a first side surface 111, a variable cross-section section 120, a rounded corner 121, a notch 122, and a second side surface 123;
[0029] Steel cage 200, main reinforcement 210, stirrups 220;
[0030] Upper sleeve 310, lower sleeve 320, convex ring 321;
[0031] Insert rod 400;
[0032] Buckle tube 500, elastic fin 510;
[0033] Upper end plate 610 and lower end plate 620 . DETAILED DESCRIPTION
[0034] The utility model provides the following description with reference to the accompanying drawings to help fully understand the various embodiments of the utility model as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the utility model.
[0035] In the description of the present invention, descriptions of orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0036] It will be understood that when one element (eg, a first element) is “connected” to another element (eg, a second element), the element may be directly connected to the other element or an intervening element (eg, a third element) may be present between the element and the other element.
[0037] The embodiment of the utility model provides a variable cross-section prefabricated component, such as Figure 1-3 As shown, the pile body 100 includes a pile body 100 and a steel cage 200 buried in the pile body 100. The pile body 100 includes a plurality of square pile segments 110 and a plurality of variable cross-section segments 120 arranged along its length direction. The cross-section shape of the square pile segment 110 is a square, and the cross-section shape of the variable cross-section segment 120 is a square with four rounded corners 121. The rounded corners 121 can extend along the length direction of the pile body 100 and spread over the entire variable cross-section segment 120. This design allows the four corners of the variable cross-section segment 120 to form inwardly concave notches 122.
[0038] When used in friction pile conditions, the soil around the pile will be embedded in the notch 122 of the pile body 100 to wrap the entire pile body 100. If the pile needs to resist pull-out and rise or pressure and fall, the soil in the notch 122 needs to be sheared and destroyed first, and the pile body 100 can be pulled out or pressed down. This makes full use of the characteristic that the shear strength of the soil is much greater than the friction resistance provided by the relative sliding between the pile body 100 and the soil, greatly improving the bearing capacity of a single pile. Under the same bearing capacity design requirements, the pile length can be shortened, thereby reducing the project cost and reducing resource waste.
[0039] The design of the rounded corners 121 can reduce the use of cementitious materials such as pile body concrete, save costs, and avoid stress concentration at the four corners of the variable cross-section section 120, making concrete less likely to crack during production, transportation and construction. At the same time, the rounded corners 110 are easier to demould than right angles when demoulding after the concrete solidifies, and the appearance is smooth and has no roughness.
[0040] The pile body 100 of this embodiment can adopt a solid design. Compared with hollow square piles or pipe piles, the solid pile design has better mechanical properties in terms of shear resistance, bending resistance, and pressure bearing. When the pile top is connected to the pedestal, the solid pile does not need to be core-filled as required by the specifications, thus saving the core-filling process that brings about long construction period, high cost, and difficulty in ensuring the quality of the core filling.
[0041] In some embodiments, the steel cage 200 includes a plurality of main bars 210 and stirrups 220. The main bars 210 are distributed in a circular shape relative to the center of the pile body 100. The stirrups 220 are wound on the outside of the main bars 210. Specifically, the stirrups 220 can be wound in a spiral shape or other shapes. Therefore, the number of main bars 210 in this embodiment is not limited to multiples of 4, and the number of reinforcements is more flexible. The steel bars can be reasonably configured according to the prestressing requirements of the product to avoid unnecessary waste of steel. At the same time, the entire steel cage 200 is cylindrical in structure. When the cylindrical steel cage is automatically rolled and welded with spiral stirrups, the welding points between the main bars 210 and the stirrups 220 can be guaranteed to be uniform and reliable, which can better ensure product quality.
[0042] In some embodiments, for the convenience of description, the four sides of the square pile segment 110 are named as the first side 111, and the four sides of the variable cross-section segment 120, that is, the four sides of the plane, are named as the second side 123. The four second side 123 of the variable cross-section segment 120 are respectively connected to the four first side 111 of the square pile segment 110, and the four second side 123 of the variable cross-section segment 120 are respectively located on the same vertical plane as the four first side 111 of the square pile segment 110, and the plane where the four second side 123 of the variable cross-section segment 120 are located can cover the entire pile body 100, reducing the resistance of the pile body 100 when sinking the pile, which is equivalent to rounding a local section of the square pile on the basis of the existing square pile.
[0043] In some embodiments, Figure 1 As shown, the square pile segment 110 and the variable cross-section segment 120 are each provided with one, and the square pile segment 110 and the variable cross-section segment 120 are connected to each other.
[0044] In other embodiments, Figure 4 As shown, two square pile segments 110 are provided, and one variable cross-section segment 120 is provided. The two square pile segments 110 are respectively located at two ends of the variable cross-section segment 120 , and the two square pile segments 110 are both connected to the variable cross-section segment 120 .
[0045] In some other embodiments, Figure 5 As shown, a plurality of square pile segments 110 and variable cross-section segments 120 are provided, and the square pile segments 110 and variable cross-section segments 120 are arranged at intervals along the length direction of the pile body 100 , and the square pile segments 110 and variable cross-section segments 120 are connected in sequence.
[0046] Therefore, according to the actual tensile or compressive working conditions, the variable cross-section segment 120 can be designed as a single section or multiple sections according to design requirements, and can be applied to different design working conditions through flexible transformation.
[0047] In some embodiments, the ratio of the radius of the chamfer 121 to the width of the variable cross-section segment 120 can be 1 / 5-1 / 3. The size of the chamfer 121 in this embodiment is larger, so that the cross-sectional shape of the entire variable cross-section segment 120 is similar to a circle, which makes it less likely for concrete to crack during production, transportation and construction, and further facilitates demolding.
[0048] Furthermore, the radius of the rounded corner 121 may be 100-200 mm, and the width of the variable cross-section section 120 may be 300-1000 mm. Preferably, the radius of the rounded corner 121 is 150 mm, and the width of the variable cross-section section 120 is 600 mm.
[0049] In some embodiments, the main reinforcement 210 is evenly distributed in a circular shape relative to the center of the pile body 100, so that the force exerted by the main reinforcement 210 on the concrete of the pile body 100 is more uniform. Figure 2 As shown, nine main ribs 210 may be provided. Of course, other numbers may be provided according to actual needs.
[0050] In some embodiments, both ends of the pile body 100 are fixed with end plates, and both ends of the main reinforcement 210 are anchored and fixed to the two end plates respectively. When the pile is produced, the two ends of all the main reinforcements 210 are firstly subjected to pier head treatment; then all the main reinforcements 210 and the stirrups 220 are roll welded by an automatic roll welding machine to form an integrated steel cage, and the workers install the pier heads at both ends of the steel cage in the countersunk holes of the end plates; the tensioning plate and the end plates are connected by tensioning screws, and the tensioning machine drives the end plates to move forward to stretch the steel bars and give them prestress; after the tensioning is completed, the material laying, vibration forming, steam curing, autoclaving and other processes are carried out to form the component.
[0051] An embodiment of the utility model provides a pile connection structure, including two variable-section prefabricated components of any of the above embodiments. The specific description of the variable-section prefabricated components can refer to the above embodiments and will not be repeated here. One of the variable-section prefabricated components is located above the other variable-section prefabricated component. For the convenience of description, the pile body of the variable-section prefabricated component located above is named as an upper-section pile, and the pile body of the variable-section prefabricated component located below is named as a lower-section pile. An upper end plate is fixed to the bottom surface of the upper-section pile, and a lower end plate is fixed to the top surface of the lower-section pile. The upper end plate and the lower end plate are welded and fixed to achieve pile connection.
[0052] The embodiment of the utility model provides a pile connection structure, such as Figure 6 and Figure 7As shown, it includes two variable-section prefabricated components of any of the above embodiments. The specific description of the variable-section prefabricated components can refer to the above embodiments and will not be repeated here. One of the variable-section prefabricated components is located above the other variable-section prefabricated component. For the convenience of description, the pile body of the variable-section prefabricated component located above is named as an upper section pile 101, and the pile body of the variable-section prefabricated component located below is named as a lower section pile 102.
[0053] A plunger 400 extending downward is fixed to the bottom of the upper pile 101, and a buckle barrel 500 is sleeved on the plunger 400. The buckle barrel 500 has elastic fins 510 that can be radially expanded outward or contracted inward. A plurality of elastic fins 510 can be provided and arranged around the center of the buckle barrel 500, and the elastic fins 510 can extend obliquely upward. A lower sleeve 320 is fixed to the top of the lower pile 102, and a convex ring 321 is provided on the inner wall of the lower sleeve 320. The convex ring 321 can surround the inner wall of the lower sleeve 320, and the existence of the convex ring 321 is equivalent to reducing the inner diameter of the lower sleeve 320.
[0054] When the upper pile 101 and the lower pile 102 need to be docked, the insertion rod 400 is inserted into the lower sleeve 320. During the insertion process, the elastic fins 510 are squeezed and contracted inwardly, so that the buckle tube 500 can smoothly pass through the convex ring 321. After the buckle tube 500 passes through the convex ring 321, the elastic fins 510 will be elastically reset, thereby opening outwards, and then abutting against the bottom of the convex ring 321, and achieving a clamping connection with the convex ring 321, and the insertion rod 400 is difficult to be pulled out of the lower sleeve 320. In this embodiment, the insertion rod 400 only needs to be aligned with the lower sleeve 320 and inserted into the lower sleeve 320 to complete the docking, which can achieve the rapid connection of the upper pile 101 and the lower pile 102. At the same time, the clamping method can limit the insertion rod 400 from being separated from the lower sleeve 320, ensuring the stability of the connection.
[0055] In some embodiments, an upper sleeve 310 is embedded in the bottom of the upper pile 101, and the upper sleeve 310 can be anchored in concrete. The main reinforcement 210 in the upper pile 101 is anchored to the upper sleeve 310 to stabilize and fix the upper sleeve 310 to prevent it from dislocating. The upper end of the plunger 400 is fixed in the upper sleeve 310. The main reinforcement 210 in the lower pile 102 is anchored to the lower sleeve 320 to stabilize and fix the lower sleeve 320 to prevent it from dislocating.
[0056] Furthermore, the insertion rod 400 is threadedly connected to the upper sleeve 310, and the buckle tube 500 is threadedly connected to the insertion rod 400, both of which adopt a detachable structure to facilitate installation and disassembly.
[0057] The embodiment of the utility model also provides another pile connection structure, such as Figure 8As shown, it includes two variable-section prefabricated components of any of the above embodiments. The specific description of the variable-section prefabricated components can refer to the above embodiments and will not be repeated here. One of the variable-section prefabricated components is located above the other variable-section prefabricated component. For the convenience of description, the pile body of the variable-section prefabricated component located above is named as an upper section pile 101, and the pile body of the variable-section prefabricated component located below is named as a lower section pile 102.
[0058] The upper end plate 610 is fixed to the bottom surface of the upper section pile 101, and the upper end plate 610 is fixed with a plunger 400 extending downward, and a buckle tube 500 is sleeved on the plunger 400. The buckle tube 500 has elastic fins 510 that can be radially expanded outward or contracted inward. A plurality of elastic fins 510 can be provided and arranged around the center of the buckle tube 500, and the elastic fins 510 can extend obliquely upward. The lower end plate 620 is fixed to the top surface of the lower section pile 102, and the lower end plate 620 is provided with a through hole. The top surface of the lower section pile 102 is provided with a lower connecting hole 103 that is connected to the through hole, and the aperture of the through hole is smaller than the aperture of the lower connecting hole 103.
[0059] When the upper pile 101 and the lower pile 102 need to be docked, the insertion rod 400 is inserted into the perforation. During the insertion process, the elastic fin 510 is squeezed and contracts inwardly, so that the buckle tube 500 passes through the lower end plate 620. After the buckle tube 500 passes through the lower end plate 620, the elastic fin 510 will be elastically reset, thereby opening outward, and then abutting against the bottom of the lower end plate 620, and achieving a clamping connection with the lower end plate 620, and the insertion rod 400 is difficult to be pulled out of the lower pile 102. In this embodiment, only the insertion rod 400 needs to be aligned with the perforation of the lower end plate 620 and inserted into the perforation of the lower end plate 620 to complete the docking, which can realize the rapid connection of the upper pile 101 and the lower pile 102. At the same time, the clamping method can limit the insertion rod 400 from being separated from the lower end plate 620, ensuring the stability of the connection.
[0060] In some embodiments, the insertion rod 400 is threadedly connected to the upper end plate 610, and the buckle tube 500 is threadedly connected to the insertion rod 400, both of which adopt a detachable structure to facilitate installation and disassembly.
[0061] In some embodiments, the main reinforcement in the upper pile section 101 is anchored to the upper end plate 610, and the main reinforcement in the lower pile section 102 is anchored to the lower end plate 620. Specifically, the two ends of the main reinforcement can be headed, and then all the main reinforcements and stirrups are roll-welded by an automatic roll welding machine to form an integrated steel cage, and then the heads at both ends of the steel cage are installed in the countersunk holes of the end plate to complete the connection.
[0062] The terms and words used in the above description and claims are not limited to the literal meanings, but are only used by the applicant to enable a clear and consistent understanding of the utility model. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the utility model is provided only for illustration, and not for limiting the utility model as defined by the attached claims and their equivalents.
Claims
1. A prefabricated component with a variable cross-section, characterized in that: It includes a pile body and a steel cage buried in the pile body. The pile body includes a plurality of square pile segments and a plurality of variable cross-section segments arranged along its length direction. The cross-sectional shape of the square pile segment is a square, and the cross-sectional shape of the variable cross-section segment is a square with rounded corners, so that notches are formed at the four corners of the variable cross-section segment.
2. The variable cross-section prefabricated component according to claim 1, characterized in that: The steel cage comprises a plurality of main bars and stirrups, wherein the main bars are distributed in a circular shape relative to the center of the pile body, and the stirrups are wound around the outside of the main bars.
3. The variable cross-section prefabricated component according to claim 1, characterized in that: The four side surfaces of the variable cross-section segment are respectively connected to the four side surfaces of the square pile segment, and the four side surfaces of the variable cross-section segment and the four side surfaces of the square pile segment are respectively located on the same vertical plane.
4. The variable cross-section prefabricated component according to any one of claims 1 to 3, characterized in that: The square pile segment and the variable cross-section segment are each provided with one, and the square pile segment and the variable cross-section segment are connected to each other; or, the square pile segment is provided with two, and the variable cross-section segment is provided with one, and the two square pile segments are respectively located at two ends of the variable cross-section segment and are both connected to the variable cross-section segment; or, the square pile segment and the variable cross-section segment are each provided with multiple, and the square pile segments and the variable cross-section segments are arranged at intervals along the length direction of the pile body and are connected in sequence.
5. The variable cross-section prefabricated component according to claim 2, characterized in that: End plates are fixed at both ends of the pile body, and both ends of the main reinforcement are anchored and fixed to the two end plates respectively.
6. A pile connection structure, characterized in that: It comprises two variable-section prefabricated components as described in any one of claims 1 to 4, wherein one variable-section prefabricated component is located above the other variable-section prefabricated component; an upper end plate is fixed to the bottom surface of the pile body located above, and a lower end plate is fixed to the top surface of the pile body located below, and the upper end plate and the lower end plate are fixed by welding.
7. A pile connection structure, characterized in that: It comprises two variable-section prefabricated components as described in any one of claims 1 to 4, wherein one variable-section prefabricated component is located above the other variable-section prefabricated component; a downwardly extending insertion rod is fixed to the bottom of the pile body located above, a snap-on tube is sleeved on the insertion rod, and the snap-on tube has elastic fins that can be radially expanded outward or contracted inward; a lower sleeve is fixed to the top of the pile body located below, a convex ring is provided on the inner wall of the lower sleeve; during the process of inserting the insertion rod into the lower sleeve, the elastic fins contract inwards to allow the snap-on tube to pass through the convex ring, and after the snap-on tube passes through the convex ring, the elastic fins expand outwards to engage with the convex ring.
8. The pile connection structure according to claim 7, characterized in that: An upper sleeve is embedded in the bottom of the pile body at the top, the main reinforcement in the pile body at the top is anchored to the upper sleeve, and the upper end of the insertion rod is fixed in the upper sleeve; the main reinforcement in the pile body at the bottom is anchored to the lower sleeve.
9. A pile connection structure, characterized in that: The cam is configured to have a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, each of which has a plurality of camshafts, 10. The pile connection structure according to claim 9, characterized in that: The insertion rod is threadedly connected to the upper end plate, and the buckle tube is threadedly connected to the insertion rod.