Isolation pile and construction method

Abstract

The invention provides an isolation pile and a construction method, relates to the field of isolation piles, and aims to solve the problem that a concrete isolation pile and a steel plate isolation pile are difficult to meet the requirements of efficient vibration isolation and convenient recovery during road engineering construction at the same time at present. The vibration isolation material in the filling cavity can directly absorb and block vibration waves and reduce vibration propagation, the elastic supporting rods of the supporting frame absorb vibration energy and reduce vibration strength through elastic deformation, the multiple isolation pile single bodies are spliced into a wall through the lock catches, a continuous vibration isolation barrier is formed, the propagation path of the vibration waves is blocked, and therefore efficient vibration isolation is achieved. The square steel shell can be recycled, grouting can be conducted through the grouting pipe in the recycling process, a concrete shell structure is formed outside the supporting frame and the vibration isolation material, connection between the pile and a soil body can be enhanced, the stability of the pile is improved, overuse of a pile body material is reduced, the engineering cost is reduced, and the economic and environment-friendly requirements are met.

Description

Technical Field

[0001] The present invention relates to the field of isolation piles, and in particular to an isolation pile and a construction method. Background Art

[0002] In road construction, road rolling and dynamic tamping are commonly used ground treatment and compaction methods. They can significantly improve the density and bearing capacity of the foundation soil, ensuring the stability and durability of the road project. However, these construction processes inevitably generate strong vibrations. These vibration waves propagate through the foundation soil, affecting surrounding buildings and structures to varying degrees, and can even cause structural damage, cracks, and other serious consequences.

[0003] In order to effectively control the adverse effects of vibrations generated by road rolling and dynamic compaction construction on the surrounding environment, the vibration isolation technologies commonly used in engineering mainly include vibration isolation piles. Vibration isolation piles, with their excellent vibration isolation performance, can effectively block the propagation path of vibration waves, and show significant effects in controlling the scope and intensity of vibration impact. However, vibration isolation piles are usually cast with materials such as concrete and are permanent structures that cannot be recycled. Steel sheet piles have the function of being recyclable and reusable, but the vibration isolation effect is relatively poor, and during the removal of steel sheet piles, ground collapse may occur, causing settlement and deformation of surrounding structures. Existing vibration isolation piles and steel sheet piles have certain limitations in the application of vibration control in road engineering, and it is difficult to simultaneously meet the engineering requirements of efficient vibration isolation, economy and environmental protection. Summary of the Invention

[0004] The purpose of the present invention is to address the defects of the existing technology and provide an isolation pile and a construction method. The pile is equipped with a square steel shell, a support frame and a pile head. A filling cavity is formed inside the square steel shell. The vibration isolation material in the filling cavity can directly absorb and block the vibration waves, reducing the propagation of vibration. The elastic support rod of the support frame absorbs vibration energy through elastic deformation and reduces the vibration intensity. Multiple isolation pile units are spliced ​​into a wall through locks to form a continuous vibration isolation barrier, blocking the propagation path of the vibration wave, thereby achieving efficient vibration isolation.

[0005] The first object of the present invention is to provide an isolation pile, which adopts the following scheme: Including isolation pile monomer, isolation pile monomer includes: The square steel shell has a filling cavity formed inside. The outer surface is provided with a grouting pipe and a lock that engages with other isolation piles. The filling cavity is filled with vibration isolation material. The support frame includes a support plate and an elastic support rod. The two support plates respectively abut against a pair of inner walls of the filling cavity and form a sliding fit with the inner walls of the filling cavity along the axial direction of the square steel shell. The two support plates are connected by the elastic support rod. The pile head has one end connected to the support frame and the other end forming a pointed end, and the bottom end of the square steel shell abuts against one end of the pile head connected to the support frame.

[0006] Furthermore, the square steel shell includes two shells that are spliced ​​together, the cross-section of the shells is concave, and the two shells are spliced ​​together to form a square steel shell with a rounded cross-section.

[0007] Furthermore, a vibration isolation bar is provided at the joint position of the shell, which separates the two shells of the same square steel shell in the horizontal direction. The shell is connected to an auxiliary plate, which abuts the vibration isolation bar to keep the vibration isolation bar between the two shells.

[0008] Furthermore, the connection direction of the two support plates of the support frame is perpendicular to the splicing direction of the isolation pile monomers.

[0009] Furthermore, a guide slot is provided on the inner wall of the filling cavity, one side of the support plate extends into the guide slot and forms a sliding fit, and the guide slot is distributed along the axial length of the square steel shell.

[0010] Furthermore, a group of relatively distributed outer walls of the square steel shell are respectively provided with lock buckles, and two lock buckles distributed at intervals are provided on the same outer wall. The lock buckles are combined with the outer walls to form a groove, and the grouting pipe avoids the lock buckles and is fixed in the groove.

[0011] Furthermore, a matching groove is provided at one end of the pile head, and the bottom end of the square steel shell is inserted into the matching groove.

[0012] Furthermore, a plurality of elastic support rods are provided, which are spaced apart in sequence along the axis of the square steel shell, and both ends of the elastic support rods are connected to the support plates through support blocks.

[0013] A second object of the present invention is to provide a construction method for isolation piles, using the isolation piles provided by the first object, comprising: According to the construction position of the isolation pile unit, the isolation pile unit is driven through the pile foundation so that the square steel shell, support frame and pile head are driven into the stratum; Drive multiple isolation piles in sequence, so that adjacent isolation piles are spliced ​​together through locking snaps; After piling is completed, grab the square steel shell of the isolation pile and pull it upwards, while the pile head and support frame remain in the ground. During the upward pulling process of the square steel shell, grouting is performed through the grouting pipe on its side to form the gap; Before the grouting of the isolation pile unit solidifies, pull out the square steel shell of the adjacent isolation pile unit. After the slurry solidifies, combine it with the pile head and support frame to form a permanent isolation pile.

[0014] Furthermore, a weight is applied to the top of the support plate to maintain the position of the support frame, and the vibration isolation effect of the isolation pile unit is tested.

[0015] Compared with the prior art, the present invention has the following advantages and positive effects: In view of the fact that concrete isolation piles and steel plate isolation piles are currently difficult to simultaneously meet the requirements of efficient vibration isolation and easy recycling during road engineering construction, square steel shells, support frames and pile heads are configured. A filling cavity is formed inside the square steel shell. The vibration isolation material in the filling cavity can directly absorb and block vibration waves, reducing the propagation of vibration. The elastic support rods of the support frame absorb vibration energy through elastic deformation to reduce vibration intensity. Multiple isolation pile units are spliced ​​into a wall through locks to form a continuous vibration isolation barrier, blocking the propagation path of vibration waves, thereby achieving efficient vibration isolation. The square steel shell can be recycled, and during the recycling process, grouting can be performed through the grouting pipe to form a concrete shell structure outside the support frame and vibration isolation material, which can enhance the connection between the pile and the soil, improve the stability of the pile, and reduce the excessive use of pile materials. After the construction is completed, the square steel shell and other materials can be recycled to reduce project costs and meet economic and environmental protection requirements.

[0016] Because isolation piles are tightly bonded to the soil through grouting and have a stable structure, they cause minimal disturbance to the surrounding soil during construction and use. Furthermore, compared to steel sheet piles, grouting during the removal of the square steel shell stabilizes the soil and wraps the support frame and vibration isolation material, forming a stable, permanent isolation pile. This prevents ground collapse and surrounding structural deformation caused by removal.

[0017] The square steel shell serves as a temporary structure, bearing the load and positioning functions during piling, and can be reused after recycling. The solidified body formed by the pile head, support frame, and grouting serves as the permanent structure, retaining the core function of vibration isolation. The combination of a temporary carrier and a permanent core balances economy and functionality.

[0018] The principle of weighted fixed support frame is to balance the friction when the shell is pulled out through external force, to prevent the support frame from floating up with the shell, to ensure that it maintains the preset position before the slurry solidifies, and to ensure the structural stability of the permanent isolation pile.

[0019] The guide grooves on the inner wall of the filling cavity are distributed along the entire axial length, and the support plate extends into the grooves to form a sliding fit, providing a clear movement path for the support plate, ensuring that it can only slide axially along the square steel shell, avoiding the support plate from deflecting under vibration and affecting the support effect.

[0020] The connection direction of the two support plates of the support frame is perpendicular to the splicing direction. When multiple isolation pile units are spliced ​​into a wall through locks, the support plates can buffer vibrations perpendicular to the splicing direction, complementing the vibration isolation barrier formed in the splicing direction.

[0021] The U-shaped cross-section is formed by joining two concave shells. This split design facilitates the filling of internal vibration isolation materials and subsequent component maintenance and replacement. The vibration isolation strips at the joints horizontally separate the shells, reducing vibration transmission between them. The auxiliary plate abuts the isolation strips to ensure installation stability and prevent them from falling off during construction or in vibrating environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 Schematic diagram of an isolation pile in one or more embodiments of the present invention.

[0024] Figure 2 Schematic diagram of isolation piles inserted into soil according to one or more embodiments of the present invention.

[0025] Figure 3 Schematic diagram of providing vibration isolation strips at the shell splicing locations in one or more embodiments of the present invention.

[0026] Figure 4 Schematic diagram of an auxiliary plate in one or more embodiments of the present invention.

[0027] Figure 5 Schematic diagram of a pile head in one or more embodiments of the present invention.

[0028] Figure 6 Schematic diagram of isolation piles after construction in one or more embodiments of the present invention.

[0029] Figure 7 Schematic diagram of the process of pulling out the square steel shell of the isolation pile in one or more embodiments of the present invention.

[0030] Figure 8 FIG. 1 is a top view of an isolation pile according to one or more embodiments of the present invention.

[0031] Among them, 1. Square steel shell; 2. First locking buckle; 3. Vibration isolation structure; 4. Support plate; 5. Second locking buckle; 6. Support block; 7. Elastic support rod; 8. Grouting pipe; 9. Pile head; 10. Soil; 11. Vibration isolation material; 12. Auxiliary plate; 13. Fastener; 14. Vibration isolation strip; 15. Oblong hole; 16. Ramming hammer; 17. Isolation pile unit; 18. Existing structure; 19. Slurry; 20. Ballast weight; 21. Sensor. DETAILED DESCRIPTION

[0032] Example 1 In a typical embodiment of the present invention, Figures 1-8 As shown, an isolation pile is given.

[0033] While existing vibration isolation piles offer good vibration isolation performance, they are typically permanent, non-recyclable concrete structures, making them uneconomical and environmentally unsuitable. Steel sheet piles are recyclable, but offer poor vibration isolation and can easily cause ground collapse and surrounding structure deformation when removed. Based on this, this embodiment provides an isolation pile that effectively isolates vibration while meeting environmental requirements and reducing adverse impacts on surrounding ground and structures during construction.

[0034] like Figure 1 As shown, the isolation pile includes an isolation pile unit, and multiple isolation pile units are arranged. Adjacent isolation pile units can be spliced ​​together. The isolation pile unit mainly includes a square steel shell, a support frame and a pile head.

[0035] The interior of the square steel shell forms a filling cavity for vibration isolation material, providing a structural foundation for vibration isolation. Grouting pipes and locking clips are located on the outer perimeter to interlock and connect with other isolation piles. These pipes can be used to inject grout into the soil surrounding the piles, strengthening the bond between the piles and the soil, enhancing stability and vibration isolation. The locking clips allow multiple isolation piles to interlock and connect, forming a continuous isolation wall that effectively blocks the propagation of vibration waves.

[0036] The support frame consists of support plates and elastic support rods. The two support plates abut a pair of inner walls of the filling cavity, forming a sliding fit with the inner walls along the axial direction of the square steel shell. The two support plates are connected by the elastic support rods. The sliding fit between the support plates and the inner walls of the filling cavity allows the square steel shell to be withdrawn, allowing it to axially separate from the support frame. The elastic support rods connecting the two support plates absorb and buffer vibration energy through elastic deformation, reducing the impact of vibration on the isolation pile.

[0037] One end of the pile head is connected to the support frame, and the other end is a pointed end, which makes it easier to drive the isolation pile into the soil. At the same time, it disperses the load on the pile body, allowing the pile body to be inserted into the ground more stably, ensuring the overall stability of the isolation pile.

[0038] The vibration isolation material within the filling cavity directly absorbs and blocks vibration waves, reducing vibration propagation. The elastic support rods absorb vibration energy through elastic deformation, reducing vibration intensity. Multiple isolation piles are connected to form a wall using locking clips, creating a continuous vibration isolation barrier that blocks the propagation path of vibration waves, achieving highly effective vibration isolation.

[0039] The square steel shell is recyclable and can be grouting through the grouting pipe during the recycling process to form a concrete shell structure outside the support frame and vibration isolation material. This can strengthen the connection between the pile and the soil, improve the stability of the pile, and reduce the excessive use of pile materials. After the construction is completed, the square steel shell can be recycled to reduce project costs and meet economic and environmental protection requirements.

[0040] Because isolation piles are tightly bonded to the soil through grouting and have a stable structure, they cause minimal disturbance to the surrounding soil during construction and use. Furthermore, compared to steel sheet piles, grouting during the removal of the square steel shell stabilizes the soil and wraps the support frame and vibration isolation material, forming a stable, permanent isolation pile. This prevents ground collapse and surrounding structural deformation caused by removal.

[0041] The vibration isolation materials, elastic support rods, and pile splicing structure effectively block the propagation of vibration waves, significantly reducing the impact of vibrations generated by road rolling and dynamic compaction construction on the surrounding environment and protecting the safety of surrounding buildings and facilities. The recyclable and reusable square steel shell reduces material waste, lowers project costs, and complies with environmental protection requirements. The grouting process ensures effective vibration isolation while reducing unnecessary material consumption. The pile head design facilitates construction, and grouting enhances pile stability. The overall structure of the isolation pile can adapt to certain soil deformations, minimizing adverse effects on surrounding strata and structures during construction and use, ensuring construction safety and environmental stability.

[0042] like Figure 1 As shown, the square steel shell consists of two joined shells with a concave cross-section, forming a square steel shell with a circular cross-section. The square steel piles form a rigid shell, effectively resisting large-scale soil deformation. The inner layer is filled with vibration-isolating materials such as rubber particles, which effectively absorb stress wave energy and provide a buffering and shock absorption effect.

[0043] The U-shaped cross-section is formed by splicing two concave shells. The spliced ​​design facilitates the filling of internal vibration isolation materials and provides installation space for the vibration isolation structure. The vibration isolation structure includes vibration isolation strips and auxiliary plates. Vibration isolation strips are provided at the splicing position of the shells. The vibration isolation strips separate the two shells of the same square steel shell in the horizontal direction. The shells are connected to auxiliary plates, which abut against the vibration isolation strips to keep the vibration isolation strips between the two shells.

[0044] The vibration isolation bars at the joints horizontally separate the shells, reducing vibration transmission between them. The auxiliary plates abut the isolation bars to ensure installation stability and prevent them from falling off during construction or in vibrating environments. Because isolation piles are prone to lateral disturbances, this embodiment incorporates a vibration isolation structure that creates a disconnected structure within the square steel shell of the piles. The outer walls of the piles are reinforced with vibration isolation rubber and auxiliary plates.

[0045] Specifically, such as Figure 2 、 Figure 3 and Figure 4As shown, the auxiliary plate is provided with oblong holes, which are distributed across the vibration isolation bars. One end of the oblong hole is connected to one of the shells with a fastener, and the other end is connected to the other shell with a fastener. By using the combination of the oblong hole and the fastener, the auxiliary plate can be installed on the square steel shell to constrain the position of the vibration isolation bar. The auxiliary plate is arranged on both the inner and outer sides of the side plates of the square steel shell to constrain the vibration isolation bar between the two shells. At the same time, the oblong holes allow the auxiliary plate and the fasteners to slide relative to each other, which can adapt to the change in the gap between the two shells. The fasteners can be bolts, screws, rivets, etc. The fasteners and the oblong holes on the auxiliary plate form a sliding connection, and the distance between the two ends of the oblong hole is used to maintain the maximum distance between the two shells.

[0046] The lock buckles on the outer wall are distributed at intervals. Two lock buckles are set on the same outer wall to enhance the bite strength with the adjacent isolation pile units. The groove formed by the lock buckles and the outer wall provides a fixed space for the grouting pipe. The installation of the grouting pipe avoiding the lock buckles can avoid mutual interference between structures and ensure the stable performance of the grouting and splicing functions.

[0047] The guide grooves on the inner wall of the filling cavity are distributed along the entire axial length, and the support plate extends into the grooves to form a sliding fit, providing a clear movement path for the support plate, ensuring that it can only slide axially along the square steel shell, avoiding the support plate from deflecting under vibration and affecting the support effect.

[0048] The connection direction of the two support plates of the support frame is perpendicular to the splicing direction. When multiple isolation pile units are spliced ​​into a wall through locks, the support plates can buffer vibrations perpendicular to the splicing direction, complementing the vibration isolation barrier formed in the splicing direction.

[0049] like Figure 5 As shown, a mating groove is provided at one end of the pile head, into which the bottom end of the square steel shell is inserted, forming a socket-and-spigot connection. The mating groove of the pile head precisely accommodates the bottom end of the square steel shell, ensuring a stable connection between the pile head and the square steel shell and preventing relative displacement between the two when driven into the soil. Furthermore, this allows the square steel shell to be easily removed from the pile head, leaving the filling material and support frame in the ground.

[0050] Multiple elastic support rods are distributed at intervals along the axial direction, which can absorb vibration energy at different heights and improve the comprehensiveness of buffering; the elastic support rods are connected to the support plate through support blocks, which can increase the contact area with the support plate, disperse the force, and extend the service life of the components.

[0051] The square steel shell with a circular cross-section has a certain degree of rigidity, acting as a physical barrier to vibration wave propagation. The vibration isolation material filling the interior absorbs vibration energy through its own properties, reducing vibration wave penetration. Vibration isolation strips at the joints of the shell further block the transmission of vibration between the shells, preventing vibration from spreading through the entire shell. The elastic support rods use elastic deformation to convert vibration energy into deformation potential energy, which is then slowly released to reduce vibration intensity.

[0052] The spliced ​​square steel shell secures the isolation strips with auxiliary plates, while the interlocking joints of the multiple isolation piles form a monolithic structure, enhancing resistance to lateral soil pressure. Guide chutes restrict the sliding direction of the support plates, ensuring that the elastic support rods act as buffers only in the pre-set direction, preventing support failure due to support plate misalignment. The tight connection between the pile head groove and the square steel shell ensures verticality and overall rigidity during pile driving.

[0053] The concave-shaped shell design reduces installation complexity and facilitates quick assembly on site. The pointed tip of the pile head reduces resistance when driving into the soil, saving construction energy. The grouting pipe is secured by a groove, allowing for even injection of grout into the soil around the pile, strengthening the bond between the pile and the soil and preventing loosening of the pile after construction.

[0054] When road compaction and dynamic tamping generate vibration, the vibration waves first strike the square steel shell, where some of the vibration is blocked and reflected. The remaining vibration then propagates into the filling cavity, where the isolation material absorbs most of the energy. The unabsorbed vibration then acts on the support plate. The support plate slides along the guide grooves under the influence of vibration, causing the elastic support rods to deform, further absorbing the vibration energy. Simultaneously, the isolation strips reduce the transmission of vibration between the two shells, preventing the shells from becoming a vibration transmission medium. Multiple isolation piles are connected by locking clips to form a continuous barrier, where the vibration waves are repeatedly blocked and absorbed, preventing them from further propagating to the surrounding environment.

[0055] like Figures 1-6 As shown, during construction, the two concave-shaped shells are first assembled, the vibration isolation material and the support frame are installed, and the pile heads are connected to form an isolation pile unit; the unit is driven into the soil through the tip of the pile head, and then the adjacent units are spliced ​​with lock buckles, and finally grouting is injected around the pile through the grouting pipe for reinforcement.

[0056] After the project is completed, the square steel shell can be recycled as a whole. Due to its spliced ​​design and the lack of permanent connections such as concrete pouring, there is no need to destroy the structure during recycling, which reduces disturbance to the surrounding soil.

[0057] The square steel shell, isolation material, and elastic support rods form a triple-layer vibration isolation system: physical barrier, material absorption, and elastic cushioning. This significantly enhances the isolation effect compared to a single steel sheet pile structure. The continuously spliced ​​isolation wall, combined with the detailed design of the isolation strips, effectively blocks the diffraction and transmission of vibration waves, limiting the vibration impact range. The square steel shell is recyclable and reusable, eliminating the waste of concrete isolation piles. The spliced ​​structure reduces energy consumption during construction and recycling, complying with environmental requirements. The grouting reinforcement process strengthens the pile-soil bond, reducing over-reliance on pile material strength and indirectly saving costs.

[0058] The pointed tip design of the pile head reduces the difficulty of driving and minimizes soil disturbance during construction. Grouting ensures a tight connection between the pile and the soil, preventing the risk of ground collapse when the sheet pile is removed. The combination of guide chutes and elastic support rods allows the pile to adapt to minor soil deformations, minimizing the impact of settlement on surrounding structures. The split shell and sliding support plate design allow the isolation pile to adapt to the installation requirements of various construction scenarios. The axial distribution of multiple elastic support rods can cope with vibration loads at different depths, improving application stability in complex geological conditions.

[0059] Example 2 In another typical embodiment of the present invention, Figures 1-8 As shown, a construction method of isolation piles is provided, using the isolation piles as in Example 1.

[0060] A construction method for isolation piles, comprising: According to the construction position of the isolation pile unit, the isolation pile unit is driven through the pile foundation so that the square steel shell, support frame and pile head are driven into the stratum; Drive multiple isolation piles in sequence, so that adjacent isolation piles are spliced ​​together through locking snaps; After piling is completed, grab the square steel shell of the isolation pile and pull it upwards, while the pile head and support frame remain in the ground. During the upward pulling process of the square steel shell, grouting is performed through the grouting pipe on its side to form the gap; Before the grouting of the isolation pile unit solidifies, pull out the square steel shell of the adjacent isolation pile unit. After the slurry solidifies, combine it with the pile head and support frame to form a permanent isolation pile.

[0061] Specifically, in combination with Example 1 and Figures 1-8 , the construction method of isolation piles is explained in detail.

[0062] During construction, first assemble the two concave-shaped shells, install the vibration isolation material and support frame, arrange the vibration isolation material inside the isolation pile, and add elastic support rods at equal intervals on the inner connecting steel plate. After connecting the pile heads, the isolation pile unit is formed. Before construction begins, the site must be leveled and obstacles removed to ensure smooth access for construction machinery. Underground pipelines that could affect construction must be detected and protected to avoid damage. Garbage and debris must be removed from the construction area to ensure the site remains tidy.

[0063] The steel sheet pile axis was aligned according to the design drawings, and the position of each pile was marked. Based on the pre-set construction location, the isolation piles were driven into the ground using pile foundation equipment. The pointed structure of the pile head reduced penetration resistance, while the square steel shell provided overall rigid support, ensuring the pile body was vertically embedded in the ground, laying the foundation for subsequent splicing and vibration isolation.

[0064] Sequentially driven isolation piles are connected by locking buckles, forming a continuous isolation barrier. The buckle's groove design matches the square steel shell, ensuring a tight connection while avoiding squeezing components such as grouting pipes, ensuring that each structure functions independently.

[0065] After piling is complete, the square steel shell is lifted and removed, leaving the pile head and support frame in the ground. The square steel shell's split design has no permanent connection and flexibly contacts the pile head through a mating groove, allowing for easy separation during retrieval to avoid structural damage.

[0066] During the shell extraction process, grouting pipes inject grout into the gaps. The grouting pipes are arranged along a pre-set path along the side of the shell, precisely filling the space left after the shell is extracted. The grouting pipes also penetrate the soil surrounding the pile, strengthening the bond with the pile head and support frame.

[0067] After the adjacent shells are removed, the grout solidifies and bonds with the pile heads and support frames. This step utilizes the cementing effect of the grout to transform the temporary structure into a permanent vibration isolation system while avoiding the ground voids that occur after traditional steel sheet pile removal.

[0068] Apply pressure to the top of the support plate to secure the support frame. Specifically, you can add weights, such as jacks or counterweights, to ensure the core isolation components do not shift during grouting and shell recovery. Simultaneous testing of the isolation effect allows for timely adjustment of construction parameters to ensure that the final isolation performance meets project requirements.

[0069] Piling and assembly are performed in separate steps. The individual piles are precisely positioned using the pile tips, and then joined together using interlocking snaps to form a complete barrier, minimizing excessive ground disturbance during a single construction phase. The square steel shell provides rigid support during the piling phase and serves as a temporary carrier during the recovery phase, fulfilling both support and recovery functions.

[0070] Grouting is carried out simultaneously with the extraction of the outer shell. The negative pressure generated by the extraction of the outer shell is used to assist in slurry filling. At the same time, the grouting pipe is grouting along the preset path to ensure that the slurry evenly covers the gaps around the pile, solving the problem of loose filling that is prone to occur in traditional post-grouting.

[0071] The square steel shell serves as a temporary structure, bearing the load and positioning during piling, and can be recycled and reused. The solidified structure formed by the pile head, support frame, and grouting serves as the permanent structure, retaining the vibration isolation core function. This temporary carrier + permanent core approach strikes a balance between economy and functionality. The weighted support frame is designed to balance the frictional forces during the removal of the shell, preventing the support frame from floating with the shell. This ensures that the support frame remains in its pre-set position until the slurry solidifies, thus guaranteeing the structural stability of the permanent isolation pile.

[0072] The pile foundation equipment presses the individual units into the ground at the tip of the pile head. The square steel outer shell protects the internal vibration isolation material and support frame from soil compression. When adjacent units are spliced ​​together using locking buckles, the rigidity of the outer shell ensures a smooth joint surface and prevents misalignment. A mechanical gripper slowly pulls out the top of the square steel outer shell. At this point, the grouting pipe opens simultaneously, and slurry is injected along the gap between the outer shell and the ground. Because the outer shell is detachably connected to the pile head, removal only disengages the outer shell, while the pile head and support frame remain in place due to soil friction and subsequent pressure.

[0073] Under the action of gravity and soil pressure, the slurry fills all gaps, wraps the pile head and support frame and penetrates into the surrounding soil; after the adjacent shells are pulled out one by one, the slurries merge with each other to form a continuous whole, and after solidification, they form a permanent isolation pile together with the original structure.

[0074] The weighting process uses heavy objects or mechanical pressure to offset the upward force exerted on the support plate during shell removal, ensuring that the support frame does not shift before the grouting solidifies. The vibration isolation effectiveness test simulates a vibration source to measure the vibration attenuation on both sides of the isolation barrier. If the standard is not met, additional grouting or adjustment of subsequent construction parameters can be used to optimize the effect.

[0075] like Figure 5 As shown, the isolation pile unit is arranged on one side of the existing structure. On the side of the existing structure of the isolation pile unit, vibration is applied to the soil through a rammer, and data is acquired through sensors arranged on the existing structure. At a certain distance from the isolation pile and the existing structure, the soil layer is rammed with a rammer, which will generate certain vibrations, thereby monitoring the ground conditions near the existing structure.

[0076] The square steel shell has a 100% recycling rate, saving over 80% in material costs compared to concrete vibration isolation piles. Step-by-step construction reduces equipment idle time, and simultaneous grouting and recycling shortens construction time and indirectly reduces construction costs. Grout fills the void left after the shell is removed, eliminating the need for additional backfill material. This saves material and labor compared to the traditional backfilling process after steel sheet pile removal.

[0077] Applicable to complex strata such as soft soil and sandy soil, grouting can adjust the slurry ratio according to the soil characteristics, solving the problem of easy hole collapse in loose strata caused by traditional piling; step-by-step operation allows single pile adjustment to avoid affecting the overall effect due to local construction errors.

[0078] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An isolation pile, characterized in that: Including isolation pile monomer, isolation pile monomer includes: The square steel shell has a filling cavity formed inside. The outer surface is provided with a grouting pipe and a lock that engages with other isolation piles. The filling cavity is filled with vibration isolation material. The support frame includes a support plate and an elastic support rod. The two support plates respectively abut against a pair of inner walls of the filling cavity and form a sliding fit with the inner walls of the filling cavity along the axial direction of the square steel shell. The two support plates are connected by the elastic support rod. The pile head has one end connected to the support frame and the other end forming a pointed end, and the bottom end of the square steel shell abuts against one end of the pile head connected to the support frame.

2. The isolation pile according to claim 1, characterized in that: The square steel shell comprises two shells that are joined together. The cross-section of the shells is in a concave shape. The two shells are joined together to form a square steel shell with a rounded cross-section.

3. The isolation pile according to claim 2, characterized in that: The joint position of the shell is provided with a vibration isolation bar, which separates the two shells of the same square steel shell in the horizontal direction. The shell is connected with an auxiliary plate, which abuts the vibration isolation bar to keep the vibration isolation bar between the two shells.

4. The isolation pile according to claim 1, 2 or 3, characterized in that: The connection direction of the two support plates of the support frame is perpendicular to the splicing direction of the isolation pile monomers.

5. The isolation pile according to claim 4, characterized in that: A guide slot is provided on the inner wall of the filling cavity, one side of the support plate extends into the guide slot and forms a sliding fit, and the guide slot is distributed along the axial length of the square steel shell.

6. The isolation pile according to claim 1, characterized in that: A group of relatively distributed outer walls of the square steel shell are respectively provided with lock buckles, and two lock buckles distributed at intervals are provided on the same outer wall. The lock buckles are combined with the outer walls to form a groove, and the grouting pipe avoids the lock buckles and is fixed in the groove.

7. The isolation pile according to claim 1 or 6, characterized in that: One end of the pile head is provided with a matching groove, and the bottom end of the square steel shell is inserted into the matching groove.

8. The isolation pile according to claim 1, characterized in that: There are multiple elastic support rods, which are spaced apart in sequence along the axis of the square steel shell, and both ends of the elastic support rods are connected to the support plates through support blocks.

9. A method for constructing isolation piles, using the isolation piles according to any one of claims 1 to 8, characterized in that: include: According to the construction position of the isolation pile unit, the isolation pile unit is driven through the pile foundation so that the square steel shell, support frame and pile head are driven into the stratum; Drive multiple isolation piles in sequence, so that adjacent isolation piles are spliced ​​together through locking snaps; After piling is completed, grab the square steel shell of the isolation pile and pull it upwards, while the pile head and support frame remain in the ground. During the upward pulling process of the square steel shell, grouting is performed through the grouting pipe on its side to form the gap; Before the grouting of the isolation pile unit solidifies, pull out the square steel shell of the adjacent isolation pile unit. After the slurry solidifies, combine it with the pile head and support frame to form a permanent isolation pile.

10. The construction method of the isolation pile according to claim 9, characterized in that: During the construction process, weight is applied to the top of the support plate to maintain the position of the support frame, and the vibration isolation effect of the isolation pile unit is tested.

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