Core column socketed pile structure and mounting method thereof

Abstract

The invention discloses a core column socketed pile structure and a mounting method thereof in the technical field of offshore new energy power generation, the core column socketed pile structure comprises a reinforcement cage structure, a steel pipe pile and a rock mass, the bottom of the steel pipe pile is embedded into the rock mass, and the reinforcement cage structure is mounted in the steel pipe pile and the rock mass; grouting pipes are arranged among the reinforcement cage structure, the steel pipe piles and the rock mass, gaps among the reinforcement cage structure, the steel pipe piles and the rock mass are filled with grouting materials through the grouting pipes, and the reinforcement cage structure comprises a reinforcement cage body. The upper prefabricated concrete blocks and the lower prefabricated concrete blocks are prefabricated, then the steel pipe piles, the upper prefabricated concrete blocks and the lower prefabricated concrete blocks are conveyed to a site, the upper prefabricated concrete blocks are installed at the top of the reinforcement cage body, and the lower prefabricated concrete blocks are installed at the bottom of the reinforcement cage body. And batch prefabrication in factories can be realized.

Description

Technical Field

[0001] This invention relates to the technical field of offshore new energy power generation, and in particular to a core-pillar rock-embedded pile structure and its installation method. Background Technology

[0002] In recent years, with the increasing scarcity of land resources for onshore photovoltaic power plants, offshore renewable energy has become a new development trend. During the construction of offshore renewable energy projects, the foundations of these facilities must meet the requirements for uplift and bending resistance due to the shallow burial depth of the bedrock.

[0003] Chinese patent authorization announcement numbers CN221118542U and CN219527722U have effectively solved the bending bearing capacity problem of pile foundations, taking offshore photovoltaic as an example. However, they cannot solve the pull-out problem of pile foundations, especially when the offshore photovoltaic field is located in a typhoon zone and the bedrock is shallow. The soil above the bedrock layer cannot provide sufficient pull-out bearing capacity for the photovoltaic support piles. Conventional rock-socketed piles are difficult to construct at sea, and there are the following problems:

[0004] (1) Complex construction process. Before the construction of traditional rock-socketed piles, a steel sleeve needs to be set outside the drill bit. That is, the steel sleeve structure needs to be constructed before drilling, and the steel sleeve needs to be removed after the drilling is completed. The construction process is relatively complicated.

[0005] (2) Difficulty in hoisting the steel cage. The marine environment is complex, and the construction period is often accompanied by sea winds and waves, which makes the installation difficult. At the same time, the installation position of the steel cage is prone to deviation, which cannot meet the requirements of the protective layer.

[0006] (3) Grouting of rock-socketed piles is difficult. The grouting section of the core-pillar rock-socketed pile is located in the fully submerged zone, making it difficult to install the grouting pipe to the bottom of the pile foundation. If the grouting pipe cannot be installed in the designated position, it is easy to cause uneven grouting, which will affect the strength of the pile foundation. Summary of the Invention

[0007] To address the issue of the complex construction process of traditional rock-socketed piles, which requires the installation of a separate steel sleeve outside the drill bit before drilling and the removal of the steel sleeve after drilling, this invention provides a core-column rock-socketed pile structure and its installation method.

[0008] This invention provides a core-column rock-embedded pile structure, including a steel cage structure, a steel pipe pile, and a rock mass. The bottom of the steel pipe pile is embedded in the rock mass. The steel cage structure is installed inside the steel pipe pile and the rock mass. A grouting pipe is provided between the steel cage structure, the steel pipe pile, and the rock mass. Grouting material is filled into the gaps between the steel cage structure, the steel pipe pile, and the rock mass through the grouting pipe.

[0009] The steel cage structure includes a steel cage body, an upper precast concrete block is installed on the top of the steel cage body, a lifting lug is provided on the top of the upper precast concrete block, an annular steel plate is installed at the bottom of the steel cage body, and a lower precast concrete block is provided at the bottom of the annular steel plate.

[0010] By adopting the above technical solution, the upper and lower precast concrete blocks are prefabricated, and then the steel pipe piles, upper and lower precast concrete blocks are transported to the site. The upper precast concrete blocks are installed on top of the reinforcing cage body, the annular steel plate is installed at the bottom of the reinforcing cage body, and the lower precast concrete blocks are installed at the bottom of the annular steel plate. The prefabrication in batches in the factory can serve as a mold for the reinforcing cage structure. When under stress, the stress on the upper reinforcing cage body can be effectively transferred to the annular steel plate at the bottom, so that the rock mass sidewall is subjected to joint stress from top to bottom. This avoids the situation where the upper part of the rock mass is subjected to excessive stress and the lower part is subjected to insufficient stress, which would lead to local damage to the rock mass sidewall from top to bottom and cause the failure of the compressive and tensile bearing capacity of the pile foundation.

[0011] Optionally, the upper precast concrete block includes a first precast concrete ring plate, which is installed on the top of the reinforcing cage body. A first concrete guide block is connected to the edge of the first precast concrete ring plate, and a reserved hole is provided inside the first precast concrete ring plate.

[0012] By adopting the above technical solution, the setting of the first concrete guide block can facilitate the smooth installation of the steel cage structure in the center of the steel pipe pile during hoisting.

[0013] Optionally, the steel cage body includes main bars, and a plurality of stirrups are provided on the outside of the main bars. The top of the main bars passes through a reserved hole. An upper nut and a lower nut are respectively provided between the main bars and the first precast concrete ring plate. The upper nut is located at the top of the first precast concrete ring plate, and the lower nut is located at the bottom of the first precast concrete ring plate. The bottom of the main bars is connected to the top of the ring steel plate.

[0014] By adopting the above technical solution, the first precast concrete ring plate can be installed on top of the main reinforcement through the mutual cooperation of the upper and lower nuts.

[0015] Optionally, the lower precast concrete block includes a second precast concrete ring plate, which is disposed at the bottom of the annular steel plate. A second guide block is connected to the edge of the second precast concrete ring plate. A precast concrete flange is provided on the inner side of the second precast concrete ring plate. A precast concrete support leg is connected to the bottom of the second precast concrete ring plate. Precast steel bars are embedded inside the precast concrete flange, and the top of the precast steel bars abuts against the top of the annular steel plate.

[0016] By adopting the above technical solution, the annular steel plate and the second precast concrete annular plate are fixedly connected by pre-embedded steel bars, and the bottom of the steel cage structure is guaranteed to have a sufficient concrete protective layer by precast concrete legs.

[0017] Optionally, fixing clips are pre-embedded on both the inner and outer sides of the first and second precast concrete ring plates, and the cross-section of the fixing clips is a two-thirds circular ring.

[0018] By adopting the above technical solution, the fixing clamp can ensure that the grouting pipe is installed at the bottom of the steel pipe pile together with the steel cage structure during hoisting, and the grouting pipe is pulled hard during grouting to dislodge it from the opening of the fixing clamp.

[0019] Optionally, the lifting lug includes a pre-embedded steel plate, which is pre-embedded inside the first precast concrete ring plate. The top of the pre-embedded steel plate is connected to a main steel plate, and the upper ends of both sides of the main steel plate are connected to load-bearing circular pipes. The end of the load-bearing circular pipe opposite to the main steel plate is connected to an annular sealing plate, and a lifting rope is wound around the outside of the load-bearing circular pipe.

[0020] By adopting the above technical solution, it is convenient to install the lifting rope on the load-bearing circular tube of the lifting lug, thereby enabling the lifting of the steel cage structure.

[0021] Optionally, the steel pipe pile includes a steel pipe section, the bottom of which is provided with a steel pipe tapered section, and ribs are provided between the bottom of the steel pipe section and the steel pipe tapered section.

[0022] By adopting the above technical solutions, not only can damage to steel pipe piles be prevented during the piling process, but also a reliable connection between the steel pipe piles and the reinforcing cage structure can be ensured.

[0023] The present invention also provides an installation method for the above-mentioned core-pillar rock-embedded pile structure, comprising the following steps:

[0024] S1: Complete the prefabrication of the upper and lower prefabricated concrete blocks. During prefabrication, embed lifting lugs on the upper prefabricated concrete blocks and embed fixing clamps on the inner and outer sides of the upper and lower prefabricated concrete blocks. Then complete the fabrication of steel pipe piles and transport the steel pipe piles, upper prefabricated concrete blocks and lower prefabricated concrete blocks to the site.

[0025] S2: Tie the stirrups to the outside of the main reinforcement to complete the reinforcement cage binding. When binding, use the upper and lower nuts to install the first precast concrete ring plate on the top of the main reinforcement. Then install the second precast concrete ring plate at the bottom of the ring steel plate and embed the bottom of the precast reinforcement in the precast concrete flange. Then bend the precast reinforcement and fix the second precast concrete ring plate at the bottom of the ring steel plate.

[0026] S3: Insert the bottom of the steel pipe pile into the top of the rock mass. After the steel pipe pile is driven to the designated elevation, use the steel pipe pile as a retaining wall and use drilling equipment to drill into the interior of the rock mass. The inner diameter of the rock-embedded section is consistent with the inner diameter of the steel pipe pile. After the operation is completed, clean the borehole.

[0027] S4: Install the grouting pipe to the inside and outside of the steel cage structure, install the hoisting rope on the load-bearing circular pipe of the hoisting lug, and then hoist the steel cage structure. After the steel cage structure is installed into the steel pipe pile, rely on the first concrete guide block on the upper precast concrete block and the second guide block on the lower precast concrete block to install the steel cage structure to the designated position inside the steel pipe pile and rock mass. Then continue to lower the hoisting rope to loosen the hoisting rope and separate it from the load-bearing circular pipe, and then lift the hoisting rope to retrieve it.

[0028] S5: Grouting is carried out. During grouting, the grouting pipe is pulled hard to dislodge it from the opening of the fixing clamp. Then, while grouting, the grouting pipe is slowly lifted up. After the grouting is completed, the grouting pipe is removed, and the core column rock-embedded pile structure is installed.

[0029] In summary, the present invention has at least one of the following beneficial effects:

[0030] By prefabricating the upper and lower precast concrete blocks, and then transporting the steel pipe piles, upper and lower precast concrete blocks to the site, the upper precast concrete blocks are installed on top of the steel cage body, and the lower precast concrete blocks are installed at the bottom of the steel cage body. This batch prefabrication in the factory can serve as a mold for the construction of steel cage structures.

[0031] By setting a first concrete guide block on the outside of the upper precast concrete block and a second guide block on the outside of the lower precast concrete block, the steel cage structure can be easily installed in the center of the steel pipe pile during hoisting.

[0032] The fixing clamps installed on the inner and outer sides of the upper and lower precast concrete blocks ensure that the grouting pipe is installed at the bottom of the steel pipe pile along with the steel cage structure during hoisting, ensuring uniform grouting in the later stage, thereby improving the overall strength of the pile foundation.

[0033] This invention employs a ring-shaped steel plate, which effectively transfers the stress on the upper reinforcing bars of the core-column rock-embedded pile to the bottom ring-shaped steel plate. This allows the rock mass sidewall to bear the stress from top to bottom, preventing localized damage to the rock mass sidewall from top to bottom due to excessive stress on the upper part of the rock mass and insufficient stress on the lower part, thus avoiding the failure of the pile foundation's compressive and tensile bearing capacity. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the steel cage structure of the present invention;

[0036] Figure 2 This is a top view of the precast concrete block structure of the present invention;

[0037] Figure 3 This is a front view structural diagram of the upper precast concrete block of the present invention;

[0038] Figure 4 This is a side view of the upper precast concrete block structure of the present invention;

[0039] Figure 5 This is a top view of the lower precast concrete block structure of the present invention;

[0040] Figure 6 This is a bottom view of the lower precast concrete block structure of the present invention;

[0041] Figure 7 This is a front view structural diagram of the lower precast concrete block of the present invention;

[0042] Figure 8 This is a side view of the lower precast concrete block structure of the present invention;

[0043] Figure 9 This is a schematic diagram of the connection structure between the reinforcing cage and the upper precast concrete block of the present invention;

[0044] Figure 10 This is a schematic diagram of the connection structure between the reinforcing cage and the lower precast concrete block of the present invention;

[0045] Figure 11 This is a top view schematic diagram of the connection between the steel pipe pile and the reinforcing cage of the present invention;

[0046] Figure 12 This is a schematic cross-sectional view of the overall structure of the present invention. Figure 1 ;

[0047] Figure 13 for Figure 12 A magnified view of part A in the image;

[0048] Figure 14 This is a schematic cross-sectional view of the overall structure of the present invention. Figure 2 ;

[0049] Figure 15 for Figure 14 A magnified view of part B in the image;

[0050] Figure 16 This is a schematic diagram of the steel cage hoisting and grouting structure of the present invention.

[0051] In the diagram: 1. Reinforcing cage structure; 11. Upper precast concrete block; 111. First precast concrete ring plate; 112. First concrete guide block; 113. Reserved hole; 12. Reinforcing cage body; 121. Main reinforcement; 122. Stirrups; 123. Upper nut; 124. Lower nut; 13. Annular steel plate; 14. Lower precast concrete block; 141. Second precast concrete ring plate; 142. Second guide block; 143. Precast concrete flange; 144. Precast concrete support leg; 145. Embedded reinforcement; 15. Lifting lug; 151. Main steel plate; 152. Load-bearing circular pipe; 153. Annular sealing plate; 154. Embedded steel plate; 16. Fixing clamp; 2. Steel pipe pile; 21. Steel pipe section; 22. Steel pipe tapered section; 23. Rib; 3. Grouting material; 4. Rock mass; 5. Grouting pipe; 6. Lifting rope. Detailed Implementation

[0052] The following is in conjunction with the appendix Figure 1-14 The present invention will be described in further detail below.

[0053] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 11-16 This embodiment introduces a core-pillar embedded rock pile structure, including a reinforcing cage structure 1, a steel pipe pile 2, and a rock mass 4. The bottom of the steel pipe pile 2 is embedded in the rock mass 4. The steel pipe pile 2 includes a steel pipe section 21, and a steel pipe tapered section 22 is provided at the bottom of the steel pipe section 21. Ribs 23 are provided between the bottom of the steel pipe section 21 and the steel pipe tapered section 22. This not only prevents the steel pipe pile 2 from being damaged during the piling process, but also ensures a reliable connection between the steel pipe pile 2 and the reinforcing cage structure 1.

[0054] Please refer to the attached diagram in the instruction manual. Figure 12 , Figure 13 and Figure 14 The reinforcing cage structure 1 is placed inside the steel pipe pile 2 and the rock mass 4. The height ratio of the reinforcing cage structure 1 inside the steel pipe pile 2 and the rock mass 4 is 1.5:1. A grouting pipe 5 is installed between the reinforcing cage structure 1, the steel pipe pile 2 and the rock mass 4. Grouting material 3 is filled into the gap between the reinforcing cage structure 1, the steel pipe pile 2 and the rock mass 4 through the grouting pipe 5, and fills up to about 70mm above the top of the reinforcing cage structure 1.

[0055] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 2 , Figure 3 and Figure 4The reinforcing cage structure 1 includes a reinforcing cage body 12. An upper precast concrete block 11 is installed on the top of the reinforcing cage body 12. The upper precast concrete block 11 includes a first precast concrete ring plate 111, which is installed on the top of the reinforcing cage body 12. A first concrete guide block 112 is fixedly connected to the edge of the first precast concrete ring plate 111. A reserved hole 113 is provided inside the first precast concrete ring plate 111. The first concrete guide block 112 facilitates the smooth installation of the reinforcing cage structure 1 in the center of the steel pipe pile 2 during hoisting.

[0056] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 9 and Figure 10 The reinforcing cage body 12 includes main bars 121, with several stirrups 122 arranged on the outer side of the main bars 121. The top of the main bars 121 passes through a pre-drilled hole 113. An upper nut 123 and a lower nut 124 are respectively provided between the main bars 121 and the first precast concrete ring plate 111. The upper nut 123 is located at the top of the first precast concrete ring plate 111, and the lower nut 124 is located at the bottom of the first precast concrete ring plate 111. The bottom of the main bars 121 is connected to the top of the annular steel plate 13. Thus, the first precast concrete ring plate 111 can be installed on top of the main bars 121 through the mutual cooperation of the upper nut 123 and the lower nut 124.

[0057] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 2 , Figure 3 ,and Figure 4 The top of the upper precast concrete block 11 is provided with a lifting lug 15, which includes an embedded steel plate 154. The embedded steel plate 154 is embedded inside the first precast concrete ring plate 111. The top of the embedded steel plate 154 is connected to a main steel plate 151. The upper ends of both sides of the main steel plate 151 are connected to load-bearing circular pipes 152. The end of the load-bearing circular pipe 152 facing away from the main steel plate 151 is connected to an annular sealing plate 153. A lifting rope 6 is wound around the outside of the load-bearing circular pipe 152. This facilitates the installation of the lifting rope 6 on the load-bearing circular pipe 152 of the lifting lug 15, thereby enabling the hoisting of the reinforcing cage structure 1.

[0058] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8A ring-shaped steel plate 13 is installed at the bottom of the reinforcing cage body 12. A lower precast concrete block 14 is provided at the bottom of the ring-shaped steel plate 13. The lower precast concrete block 14 includes a second precast concrete ring plate 141, which is located at the bottom of the ring-shaped steel plate 13. A second guide block 142 is fixedly connected to the edge of the second precast concrete ring plate 141. A precast concrete flange 143 is provided on the inner side of the second precast concrete ring plate 141. A precast concrete support leg 144 is connected to the bottom of the second precast concrete ring plate 141. A precast steel bar 145 is embedded inside the precast concrete flange 143, and the top of the precast steel bar 145 abuts against the top of the ring-shaped steel plate 13. The ring-shaped steel plate 13 and the second precast concrete ring plate 141 are fixedly connected by the precast steel bar 145, and the precast concrete support leg 144 ensures that the bottom of the reinforcing cage structure 1 has a sufficient concrete protective layer.

[0059] Please refer to the attached diagram in the instruction manual. Figure 2-9 Fixing clips 16 are pre-embedded on both the inner and outer sides of the first precast concrete ring plate 111 and the second precast concrete ring plate 141, and the cross-section of the fixing clips 16 is two-thirds of a circle. The fixing clips 16 can ensure that when the grouting pipe 5 is hoisted, it is installed at the bottom of the steel pipe pile 2 together with the steel cage structure 1, and when grouting is performed, the grouting pipe 5 is pulled hard to dislodge it from the opening of the fixing clips 16.

[0060] The core-pillar rock-embedded pile structure described in this embodiment can be used not only for offshore photovoltaics, but also for offshore wind turbine foundations and offshore substations in shallow overburden areas.

[0061] This embodiment also introduces an installation method for the above-mentioned core-pillar rock-embedded pile structure, including the following steps:

[0062] S1: Complete the prefabrication of the upper precast concrete block 11 and the lower precast concrete block 14. During prefabrication, embed lifting lugs 15 on the upper precast concrete block 11 and embed fixing clamps 16 on the inner and outer sides of the upper precast concrete block 11 and the lower precast concrete block 14. Then complete the fabrication of the steel pipe pile 2, and then transport the steel pipe pile 2, the upper precast concrete block 11 and the lower precast concrete block 14 to the site.

[0063] S2: At the temporary construction site, the stirrups 122 are tied to the outside of the main reinforcement 121 to complete the reinforcement cage binding. During binding, the first precast concrete ring plate 111 is installed on the top of the main reinforcement 121 by the cooperation of the upper nut 123 and the lower nut 124. Then, the second precast concrete ring plate 141 is installed at the bottom of the ring steel plate 13, and the bottom of the embedded steel bar 145 is embedded in the precast concrete flange 143. Then, the embedded steel bar 145 is bent to fix the second precast concrete ring plate 141 to the bottom of the ring steel plate 13.

[0064] S3: Insert the bottom of the steel pipe pile 2 into the top of the rock mass 4. After the steel pipe pile 2 is sunk to the designated elevation, use the steel pipe pile 2 as a retaining wall and use drilling equipment to drill into the interior of the rock mass 4. The inner diameter of the rock-embedded section (the section of the steel pipe pile 2 embedded in the rock mass 4) is consistent with the inner diameter of the steel pipe pile 2. After the operation is completed, clean the borehole.

[0065] S4: Install the grouting pipe 5 to the inner and outer sides of the reinforcing cage structure 1. Install the lifting rope 6 on the load-bearing circular pipe 152 of the lifting lug 15. Then, lift the reinforcing cage structure 1. After the reinforcing cage structure 1 is installed inside the steel pipe pile 2, the first concrete guide block 112 on the upper precast concrete block 11 and the second guide block 142 on the lower precast concrete block 14 can facilitate the smooth installation of the reinforcing cage structure 1 in the middle of the steel pipe pile 2 during lifting. The fixing clamps 16 set on the inner and outer sides of the upper precast concrete block 11 and the lower precast concrete block 14 can ensure that the grouting pipe 5 is installed together with the reinforcing cage structure 1 to the bottom of the steel pipe pile 2 during lifting, until the reinforcing cage structure 1 is installed to the designated position inside the steel pipe pile 2 and the rock mass 4. Then, continue to lower the lifting rope 6 to loosen the lifting rope 6 and detach it from the load-bearing circular pipe 152, and then lift and retrieve the lifting rope 6.

[0066] S5: Grouting of grouting material 3. During grouting, pull the grouting pipe 5 hard to remove it from the opening of the fixing clamp 16. Then, while grouting, slowly lift the grouting pipe 5 to ensure that the grouting section is grouted evenly. After the grouting is completed, remove the grouting pipe 5. The installation of the core column rock-embedded pile structure is completed.

[0067] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A core-column embedded rock pile structure, comprising a steel cage structure (1), steel pipe piles (2), and rock mass (4), characterized in that: The bottom of the steel pipe pile (2) is embedded in the rock mass (4), the steel cage structure (1) is placed inside the steel pipe pile (2) and the rock mass (4), a grouting pipe (5) is provided between the steel cage structure (1), the steel pipe pile (2) and the rock mass (4), and the gap between the steel cage structure (1), the steel pipe pile (2) and the rock mass (4) is filled with grouting material (3) through the grouting pipe (5); The steel cage structure (1) includes a steel cage body (12), an upper precast concrete block (11) is installed on the top of the steel cage body (12), a lifting lug (15) is provided on the top of the upper precast concrete block (11), an annular steel plate (13) is installed on the bottom of the steel cage body (12), and a lower precast concrete block (14) is provided on the bottom of the annular steel plate (13).

2. The core-pillar rock-embedded pile structure according to claim 1, characterized in that: The upper precast concrete block (11) includes a first precast concrete ring plate (111), which is installed on the top of the steel cage body (12). A first concrete guide block (112) is connected to the edge of the first precast concrete ring plate (111), and a reserved hole (113) is provided inside the first precast concrete ring plate (111).

3. The core-pillar rock-embedded pile structure according to claim 2, characterized in that: The main body (12) of the steel cage includes a main bar (121), and a number of stirrups (122) are provided on the outside of the main bar (121). The top of the main bar (121) passes through a reserved hole (113). An upper nut (123) and a lower nut (124) are respectively provided between the main bar (121) and the first precast concrete ring plate (111). The upper nut (123) is located at the top of the first precast concrete ring plate (111), and the lower nut (124) is located at the bottom of the first precast concrete ring plate (111). The bottom of the main bar (121) is connected to the top of the ring steel plate (13).

4. The core-pillar rock-embedded pile structure according to claim 2, characterized in that: The lower precast concrete block (14) includes a second precast concrete ring plate (141), which is located at the bottom of the annular steel plate (13). A second guide block (142) is connected to the edge of the second precast concrete ring plate (141). A precast concrete flange (143) is provided on the inner side of the second precast concrete ring plate (141). A precast concrete support leg (144) is connected to the bottom of the second precast concrete ring plate (141). A precast steel bar (145) is embedded inside the precast concrete flange (143), and the top of the precast steel bar (145) abuts against the top of the annular steel plate (13).

5. The core-pillar rock-embedded pile structure according to claim 4, characterized in that: The first precast concrete ring plate (111) and the second precast concrete ring plate (141) are both embedded with fixing clips (16) on their inner and outer sides, and the cross-section of the fixing clips (16) is a two-thirds circle.

6. The core-pillar rock-embedded pile structure according to claim 2, characterized in that: The lifting lug (15) includes a pre-embedded steel plate (154), which is pre-embedded inside the first precast concrete ring plate (111). The top of the pre-embedded steel plate (154) is connected to a main steel plate (151). The upper ends of both sides of the main steel plate (151) are connected to load-bearing round pipes (152). The end of the load-bearing round pipe (152) away from the main steel plate (151) is connected to an annular sealing plate (153). The outside of the load-bearing round pipe (152) is wrapped with a lifting rope (6).

7. The core-pillar rock-embedded pile structure according to claim 1, characterized in that: The steel pipe pile (2) includes a steel pipe section (21), a steel pipe cone section (22) is provided at the bottom of the steel pipe section (21), and a rib (23) is provided between the bottom of the steel pipe section (21) and the steel pipe cone section (22).

8. A method for installing a core-pillar rock-embedded pile structure according to any one of claims 1-7, characterized in that: Includes the following steps: S1: Complete the prefabrication of the upper precast concrete block (11) and the lower precast concrete block (14). During the prefabrication, a lifting lug (15) is pre-embedded on the upper precast concrete block (11), and a fixing clamp (16) is pre-embedded on the inner and outer sides of the upper precast concrete block (11) and the lower precast concrete block (14). Then, the steel pipe pile (2) is made, and then the steel pipe pile (2), the upper precast concrete block (11) and the lower precast concrete block (14) are transported to the site. S2: Tie the stirrups (122) to the outside of the main reinforcement (121) to complete the reinforcement cage binding. When binding, the first precast concrete ring plate (111) is installed on the top of the main reinforcement (121) by the cooperation of the upper nut (123) and the lower nut (124). Then, the second precast concrete ring plate (141) is installed at the bottom of the ring steel plate (13), and the bottom of the embedded steel bar (145) is embedded in the precast concrete flange (143). Then, the embedded steel bar (145) is bent to fix the second precast concrete ring plate (141) at the bottom of the ring steel plate (13). S3: Insert the bottom of the steel pipe pile (2) into the top of the rock mass (4). After the steel pipe pile (2) sinks to the specified elevation, use the steel pipe pile (2) as a retaining wall and use drilling equipment to drill into the interior of the rock mass (4). The inner diameter of the rock-embedded section is consistent with the inner diameter of the steel pipe pile (2). After the operation is completed, clean the borehole. S4: Install the grouting pipe (5) on the inside and outside of the steel cage structure (1), and install the hoisting rope (6) on the load-bearing round pipe (152) of the hoisting lug (15). Then hoist the steel cage structure (1). After the steel cage structure (1) is installed inside the steel pipe pile (2), rely on the first concrete guide block (112) on the upper precast concrete block (11) and the second guide block (142) on the lower precast concrete block (14) to install the steel cage structure (1) to the designated position inside the steel pipe pile (2) and the rock mass (4). Then continue to lower the hoisting rope (6) so that the hoisting rope (6) is loosened and separated from the load-bearing round pipe (152). Then lift up and retrieve the hoisting rope (6). S5: Grouting of grouting material (3) is carried out. During grouting, the grouting pipe (5) is pulled hard to remove it from the opening of the fixing clamp (16). Then, while grouting, the grouting pipe (5) is slowly lifted up. After the grouting is completed, the grouting pipe (5) is taken out and the core column rock-embedded pile structure is installed.

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