A cone-shaped anti-extraction pipe pile and its construction method

Abstract

The invention relates to a frustum-shaped anti-pulling pipe pile and a construction method thereof. The frustum-shaped anti-pulling pipe pile comprises a prefabricated frustum-shaped pipe pile section, in which a plurality of grouting main pipes are buried, and a plurality of grouting branch pipes distributed at equal intervals are connected to the grouting main pipe along the length direction of the grouting main pipe. The side wall surface of the prefabricated frustum-shaped pipe pile section is provided with an arc groove which corresponds to the grouting branch pipe one by one and is adapted to the shape of the side wall of the prefabricated frustum-shaped pipe pile section. The grouting branch pipe is arranged obliquely upward and connected to the corresponding arc groove, and an arc steel plate is embedded in the arc groove. The bottom of the arc groove located below the grouting branch pipe is provided with a conical groove adapted to the end of the arc steel plate, and both sides of the arc steel plate are rotatably connected to the prefabricated frustum-shaped pipe pile section at the junction of the bottom of the conical groove and the bottom of the arc groove. The beneficial effects of the present invention are: the pipe pile has a simple structure, is easy to manufacture and can greatly improve the pull-out bearing capacity of the pipe pile. The pile can be formed by hammering, static pressure or planting, and the pile sinking method has a wide range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation engineering, and in particular to a frustum-shaped anti-pulling pipe pile and a construction method thereof. Background Art

[0002] Regardless of the size of the pile diameter, the vertical compressive bearing capacity of the pipe pile foundation is much greater than the vertical pull-out bearing capacity. The pipe pile foundation is prefabricated in the factory, the outer wall of the pile is smooth, and the friction resistance in contact with the soil layer is small. At present, the existing technology provides some methods to improve the pull-out bearing capacity of pipe piles, such as processing the outer wall of the pipe pile into a rough surface or setting a spiral line to increase the friction resistance of the pile-soil contact surface; or when the pipe pile is prefabricated, the template is processed into a bamboo-like protrusion to form a bamboo-like pipe pile. However, the rough surface of the outer wall of the pipe pile or the setting of a spiral line has limited effect on improving the pull-out bearing capacity. Bamboo-like pipe piles are not suitable for pile sinking by hammering and static pressure methods, but only for pile planting, and the conditions of use are strictly restricted. How to facilitate the manufacture of pipe piles, solve the problem of pile sinking, and greatly improve the pull-out bearing capacity of pipe piles, make the pipe pile manufacturing process simpler, and make the pile sinking method more adaptable, is a key technical problem that needs to be solved in the current pile foundation construction. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a frustum-shaped pull-out resistant pipe pile and a construction method thereof. The pipe pile has a simple structure, is easy to manufacture and can greatly improve the pull-out bearing capacity of the pipe pile. The pile can be formed by hammering, static pressure or planting, and the pile driving method has a wide range of applications.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] The present invention provides a frustum-shaped pull-out resistant pipe pile, which is formed by connecting a plurality of prefabricated frustum pipe pile sections in sequence. A plurality of grouting main pipes are pre-buried in the prefabricated frustum pipe pile section along the length direction of the prefabricated frustum pipe pile section. The plurality of grouting main pipes are evenly distributed around the central axis of the prefabricated frustum pipe pile section. A plurality of grouting branch pipes distributed at equal intervals are connected to the grouting main pipe along the length direction of the grouting main pipe. An arc groove corresponding to the grouting branch pipe and matching the outer shape of the side wall of the prefabricated frustum pipe pile section is provided on the side wall surface of the prefabricated frustum pipe pile section. The grouting branch pipe is obliquely arranged upward and connected with the corresponding arc groove. An arc steel plate is embedded in the arc groove. A conical groove matching the end of the arc steel plate is provided at the bottom of the arc groove below the grouting branch pipe. Both sides of the arc steel plate are rotatably connected to the prefabricated frustum pipe pile section at the junction of the bottom of the conical groove and the bottom of the arc groove.

[0006] Furthermore, the grouting branch pipe is connected to the corresponding arc groove through a slurry nozzle, and the inner diameters of the multiple slurry nozzles on the grouting main pipe increase sequentially from top to bottom.

[0007] Furthermore, both sides of the inner wall of the arc-shaped steel plate are rotatably connected to the prefabricated frustum pipe pile section through connecting parts. The connecting parts include a sleeve groove, an arc-shaped sleeve, and an L-shaped rotating shaft. The prefabricated frustum pipe pile section is provided with a sleeve groove at the junction of the bottom of the conical groove and the bottom of the arc-shaped groove. The arc-shaped sleeve is arranged on the inner wall of the arc-shaped steel plate and embedded in the sleeve groove. One end of the L-shaped rotating shaft is inserted into the arc-shaped sleeve, and the other end of the L-shaped rotating shaft is anchored in the prefabricated frustum pipe pile section.

[0008] Furthermore, the angle between the bottom of the conical groove and the bottom of the arc groove is The size is 10°~30°.

[0009] Furthermore, both ends of the prefabricated frustum pipe pile section are provided with pipe pile end plates, grouting holes corresponding to the grouting main pipes are opened on the pipe pile end plates, and prestressed steel rods connected to the pipe pile end plates are embedded in the prefabricated frustum pipe pile section.

[0010] Furthermore, based on the above-mentioned frustum-shaped anti-pulling pipe pile, the present invention also provides a pipe pile construction method, comprising the following steps:

[0011] S1. Prefabricated cone-shaped pipe pile sections are manufactured, and multiple prefabricated cone-shaped pipe pile sections are connected to form cone-shaped anti-pulling pipe piles.

[0012] S2. According to the diameter of the cone-shaped anti-pulling pipe pile after the pile connection, a corresponding pile sinking method is selected to carry out pile sinking construction on the cone-shaped anti-pulling pipe pile.

[0013] S3. After the piles are sunk, grouting is performed on the cone-shaped anti-pullout pipe piles through the grouting main pipe. The arc-shaped steel plate rotates under the grouting pressure until the lower end of the arc-shaped steel plate abuts against the bottom of the conical groove, and the slurry forms a slurry cone between the arc-shaped steel plate and the prefabricated cone-shaped pipe pile section.

[0014] S4. Actual grouting volume of the cone-shaped anti-pulling pile Not less than the theoretical grouting volume When the grouting is stopped, the pile construction is completed.

[0015] Furthermore, during grouting, first keep one grouting main pipe without grouting, and grouting is performed through the remaining grouting main pipes at the same time, and finally grouting is performed through the retained grouting main pipes. When grouting emerges from the ground, the grouting main pipes are sealed with grouting stoppers until the grouting pressure of the grouting main pipe reaches 2.0MPa and the grouting flow rate is less than 1.0L / min, and then grouting of the single grouting main pipe is stopped.

[0016] Furthermore, a cone-shaped anti-pulling pile needs to be poured The actual grouting volume of a cone-shaped anti-pullout pipe pile is According to the formula Calculate, where is the radius of the slurry mixing barrel, is the height of the slurry mixing barrel, and The unit is meter.

[0017] Furthermore, a cone-shaped anti-pulling pile is provided. The theoretical grouting volume of a prefabricated cone-shaped anti-pulling pipe pile is According to the formula Calculate; where, is the number of grouting mains; The number of grouting branches on each grouting main pipe in a prefabricated cone pile section; is the arc length of the end of the arc steel plate, in mm; and They are the distances between the orthographic projections of the two ends of the arc steel plate on the vertical plane where the axis of the arc sleeve is located and the axis of the arc sleeve, in mm; It is the angle between the bottom of the conical groove and the bottom of the arc groove, ranging from 10° to 30°; is the expansion coefficient of soil layer penetration grouting volume; is the tangent symbol.

[0018] Furthermore, the production of the prefabricated cone pile section includes the following steps:

[0019] S11. Tie up the prefabricated cone pipe pile segment reinforcement cage and install the pipe pile end plates at both ends of the prefabricated cone pipe pile segment reinforcement cage.

[0020] S12. Install the conical groove formwork, embed the prestressed steel rods and grouting main pipe in the prefabricated cone pipe pile section reinforcement cage, and install the grouting branch pipe and slurry nozzle.

[0021] S13, installing the prefabricated cone pipe pile section steel formwork, placing the prefabricated cone pipe pile section steel cage into the prefabricated cone pipe pile section steel formwork, and then pouring high-strength concrete into the prefabricated cone pipe pile section steel formwork, and obtaining the prefabricated cone pipe pile section after centrifugal molding and steam curing in sequence.

[0022] S14. Install the arc-shaped steel plate so that the outer wall of the arc-shaped steel plate is flush with the outer wall of the prefabricated cone pipe pile section, and seal the joint between the arc-shaped steel plate and the wall of the arc-shaped groove with tape.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The overall structure of the present invention is simple, easy to manufacture, and has a wide range of applications in pile driving methods. The arrangement of the arc groove, the conical groove, and the arc steel plate allows the arc steel plate to rotate freely at the arc groove. During pile driving, the arc steel plate is flush with the outer wall of the prefabricated frustum pipe pile section, and the joint between the arc steel plate and the arc groove is sealed by an adhesive tape, so that the pile driving resistance is small, which is convenient for pile driving and can prevent debris from blocking the slurry nozzle. During grouting, the arc steel plate rotates to the maximum opening state under the action of the grouting pressure, and the slurry fills the cavity between the arc steel plate and the prefabricated frustum pipe pile section to form a slurry cone, and the lower end of the arc steel plate abuts against the bottom of the conical groove to form a support for the slurry cone, thereby resisting the shear force at the interface between the pipe pile wall and the grouting body when the pipe pile is pulled up, protecting the slurry cone from shear damage, and finally increasing the pull-out cross-section of the pipe pile through the multi-stage slurry cone, thereby greatly improving the pull-out bearing capacity of the pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the prefabricated frustum pipe pile section in the present invention when the arc steel plate is not installed;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at point A;

[0027] Figure 3 This is a schematic diagram of the overall structure of the prefabricated frustum pipe pile section after the arc-shaped steel plate is installed in the present invention;

[0028] Figure 4 for Figure 3 A schematic diagram of the structure at B in FIG.

[0029] Figure 5 It is a structural schematic diagram of the arc steel plate in the present invention;

[0030] Figure 6 It is a schematic diagram of the overall structure of the prefabricated frustum pipe pile section after grouting in the present invention;

[0031] Figure 7 for Figure 6 Schematic diagram of the cross section in the CC direction.

[0032] In the figure: 1. Prefabricated cone pipe pile section; 2. Arc groove; 3. Shaft sleeve groove; 4. Conical groove; 5. Slurry nozzle; 6. Grouting main pipe; 601. Grouting branch pipe; 7. Pipe pile end plate; 8. Arc steel plate; 9. Arc shaft sleeve; 10. L-shaped rotating shaft; 11. Slurry cone. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0034] A frustum-shaped anti-pulling pipe pile is formed by sequentially connecting multiple prefabricated frustum-shaped pipe pile sections 1. Figure 1-Figure 7 As shown, a plurality of grouting main pipes 6 are pre-buried in the prefabricated frustum pipe pile section 1 along the length direction of the prefabricated frustum pipe pile section 1, and the plurality of grouting main pipes 6 are evenly distributed around the central axis of the prefabricated frustum pipe pile section 1. Pipe pile end plates 7 are fixed at both ends of the prefabricated frustum pipe pile section 1, and grouting holes corresponding to the grouting main pipes 6 are opened on the pipe pile end plates 7. Prestressed steel rods connected to the pipe pile end plates 7 are pre-buried in the prefabricated frustum pipe pile section 1. A plurality of grouting branch pipes 601 are connected to the grouting main pipe 6 along the length direction thereof by welding or threaded connection. An arcuate groove 2 corresponding to the grouting branch pipe 601 and matching the outer shape of the side wall of the prefabricated frustum pipe pile section 1 is provided on the side wall surface of the prefabricated frustum pipe pile section 1. The grouting branch pipe 601 is arranged obliquely upward and connected to the corresponding arcuate groove 2. An arcuate steel plate 8 is embedded in the arcuate groove 2. A conical groove 4 matching the end of the arcuate steel plate 8 is provided at the bottom of the arcuate groove 2 located below the grouting branch pipe 601. Both sides of the arcuate steel plate 8 are rotatably connected to the prefabricated frustum pipe pile section 1 at the junction of the bottom of the conical groove 4 and the bottom of the arcuate groove 2.

[0035] When sinking piles, the arc steel plate 8 is embedded in the arc groove 2, the inner wall of the arc steel plate 8 is flush with the bottom of the arc groove 2, and the outer wall of the arc steel plate 8 is flush with the outer wall of the prefabricated frustum pipe pile section 1. In this state, the pile sinking resistance is small, which is convenient for pile sinking; after sinking piles, water is first passed to the grouting main pipe 6, and then the prefabricated frustum pipe pile section 1 is grouted through the grouting main pipe 6. Under the action of the grouting pressure, the arc steel plate 8 is squeezed by the slurry and rotates until the lower end of the arc steel plate 8 is rotated to abut against the bottom of the conical groove 4. At this time, the rotation angle of the arc steel plate 8 reaches the maximum (the maximum rotation angle is Figure 2 The angle between the bottom of the conical groove 4 and the bottom of the arc groove 2 shown in ), the upper end of the arc-shaped steel plate 8 is in the most open state, and the slurry fills the cavity between the arc-shaped steel plate 8 and the prefabricated frustum pipe pile section 1 through the grouting branch pipe 601. After the slurry solidifies, a cavity is formed between the arc-shaped steel plate 8 and the prefabricated frustum pipe pile section 1. Figure 6 The slurry cone 11 shown in the figure has the lower end of the arc steel plate 8 abutting against the bottom of the conical groove 4 to form a support for the slurry cone 11, thereby resisting the shear force at the interface between the pile wall and the grouting body when the pile is pulled up, protecting the slurry cone 11 from shear damage and improving the pull-out bearing capacity of the pile.

[0036] like Figure 2 As shown, the outlet of the grouting branch pipe 601 is connected to the slurry nozzle 5 by threaded connection or bonding, so that the grouting branch pipe 601 is connected to the corresponding arc groove 2 through the slurry nozzle 5. The inner diameters of the multiple slurry nozzles 5 on the grouting main pipe 6 increase from top to bottom, so that the pressure of the slurry nozzle 5 decreases from bottom to top, thereby realizing the formation of the slurry cone 11 from the bottom of the pile to the top of the pile.

[0037] like Figure 3 , Figure 4 As shown, the inner walls of the arc-shaped steel plate 8 are rotatably connected to the prefabricated cone-shaped pipe pile section 1 through connecting parts. The connecting parts include a sleeve groove 3, an arc-shaped sleeve 9, and an L-shaped rotating shaft 10. The prefabricated cone-shaped pipe pile section 1 is provided with a sleeve groove 3 at the junction of the bottom of the cone groove 4 and the bottom of the arc-shaped groove 2. The arc-shaped sleeve 9 is welded to the inner wall of the arc-shaped steel plate 8 and embedded in the sleeve groove 3. One end of the L-shaped rotating shaft 10 is inserted into the arc-shaped sleeve 9, and the other end of the L-shaped rotating shaft 10 is anchored in the prefabricated cone-shaped pipe pile section 1 by structural adhesive, so that the arc-shaped steel plate 8 can rotate freely around the L-shaped rotating shaft 10 along with the arc-shaped sleeve 9.

[0038] When the above-mentioned cone-shaped anti-pulling pipe pile is used for pipe pile construction, the following steps are included:

[0039] S1. Make the prefabricated cone pile section 1 according to the following steps:

[0040] S11, tying the reinforcement cage of the prefabricated cone pipe pile section 1, and installing the pipe pile end plates 7 at both ends of the reinforcement cage of the prefabricated cone pipe pile section 1. The pipe pile end plates 7 are reserved with tensioning holes and grouting holes.

[0041] S12, install the template of the conical groove 4, embed the prestressed steel rod and the grouting main pipe 6 in the steel cage of the prefabricated cone pile section 1, and install the grouting branch pipe 601 and the slurry nozzle 5. The prestressed steel rod is connected to the pile end plate 7 through the tensioning hole, and is connected to the grouting main pipe 6 through the grouting hole.

[0042] S13, installing the prefabricated cone pipe pile section 1 steel formwork, placing the prefabricated cone pipe pile section 1 steel cage into the prefabricated cone pipe pile section 1 steel formwork, and then pouring high-strength concrete into the prefabricated cone pipe pile section 1 steel formwork, and obtaining the prefabricated cone pipe pile section 1 after centrifugal molding and steam curing in sequence.

[0043] S14, install the arc steel plate 8 so that the outer wall of the arc steel plate 8 is flush with the outer wall of the prefabricated cone pipe pile section 1, and seal the joint between the arc steel plate 8 and the wall of the arc groove 2 with adhesive tape to prevent the debris from blocking the slurry nozzle 5 during pile sinking. In this embodiment, the width of the arc steel plate 8 is 100mm-200mm, the height is 200mm-500mm, and the thickness is 3mm-5mm. The width, height, and thickness of the arc groove 2 reserved on the outer wall of the prefabricated cone pipe pile section 1 are 1mm-2mm larger than the corresponding dimensions of the arc steel plate 8, respectively, so as to facilitate the installation of the arc steel plate 8.

[0044] After the prefabricated cone pipe pile section 1 is manufactured, multiple prefabricated cone pipe pile sections 1 are connected to form a cone-shaped anti-pulling pipe pile. When connecting the piles, two adjacent prefabricated cone pipe pile sections are welded or bolted together through the pipe pile end plate.

[0045] S2. According to the diameter of the cone-shaped anti-pulling pipe pile after the pile connection, the corresponding pile sinking method is selected to sink the cone-shaped anti-pulling pipe pile. Specifically, the hammer method and static pressure method are used for small and medium diameter pipe piles, and the pile planting method is used for large diameter pipe piles. The pile sinking method has a wide range of applications.

[0046] S3. After the piles are sunk, grouting is performed on the frustum-shaped anti-pullout pipe piles through the grouting main pipe 6. The arc steel plate 8 rotates under the grouting pressure until the lower end of the arc steel plate 8 abuts against the bottom of the conical groove 4. The slurry forms a slurry frustum 11 between the arc steel plate 8 and the prefabricated frustum pipe pile section 1.

[0047] During grouting, first retain one grouting main pipe 6 as an exhaust port without grouting, and then grouting is performed through the remaining grouting main pipes 6 at the same time. Finally, grouting is performed through the retained grouting main pipes 6. When grouting emerges from the ground, the grouting main pipes 6 are sealed with grouting stoppers until the grouting pressure of the grouting main pipe 6 reaches 2.0 MPa and the grouting flow rate is less than 1.0 L / min, and then grouting of the single grouting main pipe 6 is stopped.

[0048] S4. Actual grouting volume of the cone-shaped anti-pulling pile Not less than the theoretical grouting volume When the grouting is stopped, the pile construction is completed.

[0049] A cone-shaped anti-pullout pile needs to be poured The actual grouting volume of a cone-shaped anti-pullout pipe pile is According to the formula Calculate, where is the radius of the slurry mixing barrel, is the height of the slurry mixing barrel, and The unit is meter.

[0050] like Figures 4 to 7 As shown in the figure, a cone-shaped anti-pulling pile is The theoretical grouting volume of a prefabricated cone-shaped anti-pulling pipe pile is According to the formula Calculate; where, is the number of grouting main pipes 6; is the number of grouting branches 601 on each grouting main pipe 6 in a prefabricated cone pile section; is the arc length of the end of the arc steel plate, in mm; and are respectively the distances between the orthographic projections of the two ends of the arc-shaped steel plate 8 on the vertical plane where the axis of the arc-shaped shaft sleeve 9 is located and the axis of the arc-shaped shaft sleeve 9, in mm; It is the angle between the bottom of the conical groove and the bottom of the arc groove, ranging from 10° to 30°; is the expansion coefficient of soil layer penetration grouting volume, and its value is measured by testing the soil; After the grouting of a cone-shaped anti-pulling pipe pile is completed, a multi-level slurry cone is formed. The total ultimate pull-out resistance of a cone-shaped anti-pulling pipe pile increases According to the formula Calculate; where, is the weight of the soil between the slurry cones; It is the opening width of the curved steel plate when it is in the maximum opening state; is the distance between two adjacent slurry cones.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing a frustum-shaped anti-extraction pipe pile, characterized in that: The frustum-shaped anti-pulling pipe pile is formed by connecting multiple prefabricated frustum pipe pile sections in sequence. Multiple grouting main pipes are pre-buried in the prefabricated frustum pipe pile section along the length direction of the prefabricated frustum pipe pile section. The multiple grouting main pipes are evenly distributed around the central axis of the prefabricated frustum pipe pile section. Multiple grouting branch pipes distributed at equal intervals are connected to the grouting main pipe along the length direction of the grouting main pipe. The side wall surface of the prefabricated frustum pipe pile section is provided with an arc groove corresponding to the grouting branch pipe one by one and adapted to the shape of the side wall of the prefabricated frustum pipe pile section. The grouting branch pipe is arranged obliquely upward and connected to the corresponding arc groove. An arc steel plate is embedded in the arc groove. The arc groove is located at the grouting main pipe. A conical groove adapted to the end of the arc-shaped steel plate is provided at the bottom of the groove below the slurry support pipe. Both sides of the arc-shaped steel plate are rotatably connected to the prefabricated cone pipe pile section at the junction of the bottom of the conical groove and the bottom of the arc-shaped groove. Both sides of the inner wall of the arc-shaped steel plate are rotatably connected to the prefabricated cone pipe pile section through connecting parts. The connecting parts include a shaft sleeve groove, an arc-shaped shaft sleeve, and an L-shaped shaft. A shaft sleeve groove is provided on the prefabricated cone pipe pile section at the junction of the bottom of the conical groove and the bottom of the arc-shaped groove. The arc-shaped shaft sleeve is arranged on the inner wall of the arc-shaped steel plate and embedded in the shaft sleeve groove. One end of the L-shaped shaft is inserted into the arc-shaped shaft sleeve, and the other end of the L-shaped shaft is anchored in the prefabricated cone pipe pile section. The construction method of the cone-shaped anti-pulling pipe pile includes the following steps: S1, making prefabricated frustum pipe pile sections, and connecting multiple prefabricated frustum pipe pile sections into frustum-shaped anti-pulling pipe piles; S2, according to the diameter of the cone-shaped anti-pulling pipe pile after the pile connection, select the corresponding pile sinking method to carry out pile sinking construction on the cone-shaped anti-pulling pipe pile; S3. After the piles are sunk, grouting is performed on the cone-shaped anti-pulling pipe piles through the grouting main pipe. The arc-shaped steel plate rotates under the grouting pressure until the lower end of the arc-shaped steel plate abuts against the bottom of the cone-shaped groove, and the slurry forms a slurry cone between the arc-shaped steel plate and the prefabricated cone-shaped pipe pile section. S4, when the actual grouting volume of the cone-shaped anti-pulling pile is Q 实际 Not less than the theoretical grouting volume Q 理论 When the grouting is stopped, the pile construction is completed; A cone-shaped anti-pullout pile needs to be poured The actual grouting volume of a cone-shaped anti-pullout pipe pile is ; In the formula, is the radius of the slurry mixing barrel, is the height of the slurry mixing barrel, and The unit of all is meter; A cone-shaped anti-pulling pile is constructed by The theoretical grouting volume of a prefabricated cone-shaped anti-pulling pipe pile is ; In the formula, is the number of grouting mains; The number of grouting branches on each grouting main pipe in a prefabricated cone pile section; is the arc length of the end of the arc steel plate, in mm; and They are the distances between the orthographic projections of the two ends of the arc steel plate on the vertical plane where the axis of the arc sleeve is located and the axis of the arc sleeve, in mm; It is the angle between the bottom of the conical groove and the bottom of the arc groove, ranging from 10° to 30°; is the expansion coefficient of soil layer penetration grouting volume; is the tangent symbol.

2. A method for constructing a frustum-shaped anti-extraction pipe pile according to claim 1, characterized in that: The grouting branch pipe is connected with the corresponding arc groove through the slurry nozzle, and the inner diameters of the multiple slurry nozzles on the grouting main pipe increase successively from top to bottom.

3. A method for constructing a frustum-shaped anti-extraction pipe pile according to claim 2, characterized in that: Pipe pile end plates are provided at both ends of the prefabricated frustum pipe pile section, grouting holes corresponding to the grouting main pipe are opened on the pipe pile end plates, and prestressed steel bars connected to the pipe pile end plates are embedded in the prefabricated frustum pipe pile section.

4. A method for constructing a frustum-shaped anti-extraction pipe pile according to claim 1, characterized in that: During grouting, first keep one grouting main pipe without grouting, and then grout through the remaining grouting main pipes at the same time. Finally, grouting is performed through the retained grouting main pipes. When grouting emerges from the ground, the grouting main pipes are sealed with grouting stoppers. When the grouting pressure of the grouting main pipe reaches 2MPa and the grouting flow rate is less than 1L / min, grouting of the single grouting main pipe is stopped.

5. The method for constructing a frustum-shaped anti-extraction pipe pile according to claim 3, characterized in that: The production of prefabricated cone pile sections includes the following steps: S11, tying the prefabricated cone pipe pile segment reinforcement cage, and installing the pipe pile end plates at both ends of the prefabricated cone pipe pile segment reinforcement cage; S12, install the conical groove template, embed the prestressed steel rods and grouting main pipe in the prefabricated cone pipe pile section reinforcement cage, and install the grouting branch pipe and slurry nozzle; S13, installing the prefabricated cone pipe pile section steel formwork, placing the prefabricated cone pipe pile section steel cage into the prefabricated cone pipe pile section steel formwork, and then pouring high-strength concrete into the prefabricated cone pipe pile section steel formwork, and then successively performing centrifugal molding and steam curing to obtain the prefabricated cone pipe pile section; S14. Install the arc-shaped steel plate so that the outer wall of the arc-shaped steel plate is flush with the outer wall of the prefabricated cone pipe pile section, and seal the joint between the arc-shaped steel plate and the wall of the arc-shaped groove with tape.

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