Prestressed pile anchor structure

Abstract

The utility model discloses a prestressed pile anchor structure which comprises a supporting pile, a jet grouting pile is arranged on one side of the supporting pile, a mixed soil waist beam is arranged on one side of the jet grouting pile, a spiral bar is connected to the inner wall of the mixed soil waist beam in an embedded mode, a top beam is fixedly connected to the upper end of the supporting pile, an anchorage device mechanism is fixedly connected to one side of the top beam, and the anchorage device mechanism is fixedly connected to the other side of the supporting pile. And an anchor cable mechanism is inserted into the inner wall of the anchorage device mechanism. The device can achieve more efficient tensioning and locking through the arranged anchorage device mechanism, so that the stability and the bearing capacity of the whole structure are improved, and the sealing performance and the grouting quality in the grouting process are ensured through the inserted connection arrangement of the grouting pipe and the sleeve; by means of the anchor cable mechanism, the equipment can effectively control deformation of the foundation pit so as to avoid deformation of buildings around the foundation pit, the steel strand is fixedly connected with the isolation frame, the tensile strength of the anchor cable is enhanced, and the adaptability and reliability of the anchor cable under complex geological conditions are improved.

Description

Technical Field

[0001] This utility model relates to the field of prestressed pile anchor technology, specifically a prestressed pile anchor structure. Background Technology

[0002] Pile-anchor support is a foundation pit support system developed based on the theoretical research of rock anchors. It features clear stress distribution, convenient construction, and no interference with the excavation of the foundation pit, effectively shortening the construction period and reducing costs. Due to its safety and economic characteristics, the pile-anchor support system has become a widely used support method in foundation pit engineering. Traditional pile-anchor support systems typically involve driving anchor cables into the piles, then installing steel supports and steel girders, and finally tensioning prestressed anchor cables through a platform on the steel girders. Furthermore, the foundation pit needs to be excavated in layers, thus extending the construction period, increasing costs, and increasing the possibility of water leakage. Additionally, the girders have a certain width, increasing the width of the foundation pit excavation, and the platforms often bear significant stress, posing a risk of failure.

[0003] Patent CN218204422U discloses a foundation pit support structure combining PRC pipe piles and prestressed anchor cables, including PRC pipe piles, a water-stop curtain using high-pressure jet grouting piles or cement-soil mixing piles as the driving method for PRC pipe piles, prestressed anchor cables, and a steel waist beam; the left side of the water-stop curtain is set perpendicular to the bottom of the foundation pit along the boundary of the foundation pit, with its upper end flush with the natural ground and its lower end located at the groundwater below the bottom of the foundation pit, and a retaining wall is set on the natural ground on the right side of the water-stop curtain; the PRC pipe piles are set inside the water-stop curtain corresponding to the center line of the water-stop curtain; the prestressed anchor cables are set in the soil layer below the natural ground on the right side of the water-stop curtain, and the left end of the prestressed anchor cable passes through the water-stop curtain and the PRC pipe pile and is fixedly connected to the steel waist beam.

[0004] Currently, traditional prestressed pile anchor structures are ineffective at controlling foundation pit deformation during use, which may lead to deformation of surrounding buildings. With the rapid development of economic construction, slope engineering is becoming larger and larger, design conditions are becoming more and more stringent, and the degree of accident hazards is also increasing. In many cases, due to the limitations of engineering conditions, the engineering requirements can no longer be met, resulting in extremely high costs and excessively long construction periods. Utility Model Content

[0005] The purpose of this utility model is to provide a prestressed pile anchor structure to solve the problem that the prestressed pile anchor structure mentioned in the background art has a poor effect on controlling the deformation of the foundation pit during use, which may cause deformation of the surrounding buildings. With the rapid development of economic construction, the scale of slope engineering is getting larger and larger, the design conditions are becoming more and more stringent, and the degree of accident hazards is also increasing. In many cases, due to the limitations of engineering conditions, the engineering requirements can no longer be met, and the result is often that the cost is too high and the construction period is too long.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a prestressed pile anchor structure, including a support pile, a jet grouting pile on one side of the support pile, a mixed soil waist beam on one side of the jet grouting pile, spiral reinforcement embedded in the inner wall of the mixed soil waist beam, a capping beam fixed to the upper end of the support pile, an anchor mechanism fixed to one side of the capping beam, an anchor cable mechanism inserted into the inner wall of the anchor mechanism, a water-retaining platform movably connected above the support pile, a guardrail fixed to the upper end of the water-retaining platform, a soil nailing wall fixed to one side of the upper end of the support pile, and anchor nails inserted into the inner wall of the soil nailing wall;

[0007] The anchor mechanism includes a bracket, one side of which is fixedly connected to one side of the cap beam. A steel section is provided at the upper end of the bracket, and an inclined platform is provided on one side of the upper end of the bracket. A pressure plate is movably connected to one side of the inclined platform, and an anchor head is detachably connected to one side of the pressure plate. A sleeve is fixedly connected to the inner wall of the inclined platform, and a fixed cylinder is movably connected to one side of the sleeve. An adjusting component is fixedly connected to the other side of the fixed cylinder, and an adjusting rod is inserted into one side of the inner wall of the adjusting component.

[0008] Preferably, one side of the jet grouting pile is fixedly connected to one side of the support pile, and one side of the mixed soil waist beam is fixedly connected to one side of the jet grouting pile.

[0009] Preferably, the upper end of the bracket is movably connected to the lower end of the steel section, and one side of the upper end of the bracket is fixedly connected to the lower end of the inclined platform.

[0010] Preferably, the end of the fixing cylinder near the inclined platform is embedded and connected to one side of the support pile.

[0011] Preferably, the anchor cable mechanism includes a grouting pipe, the outer wall of which is inserted into the inner wall of the casing, a steel strand is provided on the outer wall of the grouting pipe, an isolation frame is provided on one side of the steel strand, a tensioning section is provided on one side of the grouting pipe, a free section is fixedly connected to one side of the tensioning section, an anchoring section is fixedly connected to one side of the free section, and an end cap is fixedly connected to one end of the anchoring section.

[0012] Preferably, the outer wall of the grouting pipe is fixedly connected to the inner wall of the steel strand, and one side of the steel strand is fixedly connected to one side of the isolation frame.

[0013] Preferably, the outer wall of the grouting pipe passes through the inclined platform and the fixed cylinder and is fixedly connected to them.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The anchor mechanism enables the equipment to achieve more efficient tensioning and locking, thereby improving the stability and load-bearing capacity of the overall structure. The insertion of the grouting pipe and the casing ensures the sealing and grouting quality during the grouting process, effectively preventing grout leakage and guaranteeing the anchoring effect. While ensuring construction safety and project quality, it can also reduce construction costs and shorten the construction period, resulting in significant economic and social benefits. The sidewall of the support pile is equipped with a fixed cylinder and an adjusting component threaded into the fixed cylinder along the inclined direction. The anchoring section of the anchor cable mechanism passes through the fixed cylinder and is connected to the adjusting component, allowing the length of the anchor cable to be adjusted by rotating the adjusting component, which facilitates the adjustment of the anchor cable tension. The inclination angle of the fixed cylinder is the same as the inclination angle of the anchor cable.

[0016] 2. The anchor cable mechanism effectively controls the deformation of the foundation pit, preventing deformation of surrounding buildings. The fixed connection between the steel strand and the isolation frame not only enhances the tensile strength of the anchor cable but also improves its adaptability and reliability under complex geological conditions. The tensioning section allows for precise tensioning of the steel strand during construction, ensuring that the prestress of the anchor cable meets usage requirements, thereby improving the stability of the support structure. The free and anchored sections effectively disperse stress when the anchor cable is under load, preventing stress concentration and further enhancing durability and safety. The fixed end caps ensure reliable locking of the anchor cable after tensioning, preventing slippage during use and guaranteeing long-term stability. The through-hole grouting pipe provides better overall integrity of the entire anchor cable mechanism during construction and use, while simplifying construction processes and improving efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the anchor mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the anchor cable mechanism of this utility model;

[0020] Figure 4 This is a front view of the three-dimensional structure of this utility model.

[0021] In the diagram: 1. Support pile; 2. Jet grouting pile; 3. Mixed soil waist beam; 4. Spiral reinforcement; 5. Crown beam; 6. Anchorage mechanism; 7. Anchor cable mechanism; 8. Water retaining platform; 9. Guardrail; 10. Soil nailing wall; 11. Anchor nail; 61. Bracket; 62. Steel section; 63. Inclined platform; 64. Bearing plate; 65. Anchor head; 66. Sleeve; 67. Fixing cylinder; 68. Adjusting component; 69. Adjusting rod; 71. Grouting pipe; 72. Steel strand; 73. Isolation frame; 74. Tensioning section; 75. Free section; 76. Anchoring section; 77. End cap. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 and Figure 4 This utility model provides a technical solution: a prestressed pile anchor structure, including a support pile 1, a jet grouting pile 2 on one side of the support pile 1, a mixed soil waist beam 3 on one side of the jet grouting pile 2, a spiral reinforcement 4 embedded in the inner wall of the mixed soil waist beam 3, a capping beam 5 fixedly connected to the upper end of the support pile 1, an anchor mechanism 6 fixedly connected to one side of the capping beam 5, an anchor cable mechanism 7 inserted into the inner wall of the anchor mechanism 6, a water-retaining platform 8 movably connected above the support pile 1, a guardrail 9 fixedly connected to the upper end of the water-retaining platform 8, a soil nailing wall 10 fixedly connected to one side of the upper end of the support pile 1, and anchor nails 11 inserted into the inner wall of the soil nailing wall 10. The anchor mechanism 6 includes a bracket 6. 1. One side of the bracket 61 is fixedly connected to one side of the cap beam 5. A steel section 62 is provided at the upper end of the bracket 61. An inclined platform 63 is provided on one side of the upper end of the bracket 61. A pressure plate 64 is movably connected to one side of the inclined platform 63. An anchor head 65 is detachably connected to one side of the pressure plate 64. A sleeve 66 is fixedly connected to the inner wall of the inclined platform 63. A fixing cylinder 67 is movably connected to one side of the sleeve 66. An adjusting component 68 is fixedly connected to the other side of the fixing cylinder 67. An adjusting rod 69 is inserted into one side of the inner wall of the adjusting component 68. One side of the jet grouting pile 2 is fixedly connected to one side of the support pile 1. One side of the mixed soil waist beam 3 is fixedly connected to one side of the jet grouting pile 2.

[0024] The anchor mechanism 6 effectively applies prestress to the support piles 1, thereby improving the stability and load-bearing capacity of the entire structure. Anchor cables are inserted into the inner wall of the anchor cable mechanism 7. Through the coordinated use of adjusting parts 68 and adjusting rods 69, the magnitude and distribution of prestress can be precisely controlled, ensuring the safety and reliability of the structure under various working conditions. Furthermore, the water-retaining platform 8 effectively prevents rainwater and other liquids from eroding the support piles 1, extending the service life of the structure. The guardrail 9 provides safety for construction personnel, preventing accidents. Anchor nails 11 are inserted into the inner wall of the soil nailing wall 10, forming a robust support system with the support piles 1, further enhancing the stability of the structure. In practical applications, the anchor cable mechanism 7 also... One end is provided with an end cap 77. The anchor cable mechanism 7 includes multiple evenly spaced steel strands 72. The steel strands 72 are provided with isolation frames 73. Furthermore, there are multiple isolation frames 73, which are distributed on the anchoring section 76. The anchoring section 76 of the anchor cable mechanism 7 does not need to be fixed to the soil in the foundation pit. Instead, the anchoring section 76 of the anchor cable mechanism 7 can be adjusted and set on the side wall of the support pile 1, which does not take up space. The side wall of the support pile 1 is provided with a fixing cylinder 67 and an adjusting member 68 threadedly connected to one end of the fixing cylinder 67. The anchoring section 76 of the anchor cable mechanism 7 passes through the fixing cylinder 67 and is connected to the adjusting member 68, so that the length of the anchor cable mechanism 7 can be adjusted by rotating the adjusting member 68, which facilitates the adjustment of the tension of the anchor cable mechanism 7.

[0025] Please see Figure 2 In order to quickly fix the anchor head 65 on the support pile 1, the upper end of the bracket 61 is movably connected to the lower end of the steel section 62, one side of the upper end of the bracket 61 is fixedly connected to the lower end of the inclined platform 63, and one end of the fixing cylinder 67 near the inclined platform 63 is embedded and connected to one side of the support pile 1.

[0026] Furthermore, half of the volume of the fixing cylinder 67 is housed within the side wall of the support pile 1. The fixing cylinder 67 has a through hole for easy passage. The adjusting member 68 has a through hole corresponding to the through hole in the fixing cylinder 67. The anchoring section 76 of the anchor cable mechanism 7 passes through the fixing cylinder 67 and the adjusting member 68. The end of the adjusting member 68 away from the fixing cylinder 67 has a through hole that communicates with the through hole and is perpendicular to it. The anchoring section 76 of the anchor cable mechanism 7 passes through this through hole. Furthermore, the anchoring section 76 of the anchor cable has multiple locking holes spaced apart. The adjusting member 68 also has an adjusting rod 69 passing through a through hole and a locking hole, allowing the adjusting member 68 to rotate via the adjusting rod 69, facilitating the adjustment of the tension of the anchor cable mechanism 7. The tilt angle of the fixing cylinder 67 is the same as the tilt angle of the anchor cable mechanism 7. The entire device can be widely used in various civil engineering projects. It has a simple structure, is easy to construct, and is low in cost. It also has good safety performance and can meet the high requirements of modern buildings for foundation structures.

[0027] Please see Figure 3 In order to quickly fix the grouting pipe 71 inside the sleeve 66, the anchor cable mechanism 7 includes the grouting pipe 71. The outer wall of the grouting pipe 71 is inserted into the inner wall of the sleeve 66. The outer wall of the grouting pipe 71 is provided with a steel strand 72. An isolation frame 73 is provided on one side of the steel strand 72. A tensioning section 74 is opened on one side of the grouting pipe 71. A free section 75 is fixedly connected to one side of the tensioning section 74. An anchoring section 76 is fixedly connected to one side of the free section 75. An end cap 77 is fixedly connected to one end of the anchoring section 76. The outer wall of the grouting pipe 71 is fixedly connected to the inner wall of the steel strand 72. One side of the steel strand 72 is fixedly connected to one side of the isolation frame 73. The outer wall of the grouting pipe 71 passes through the inclined platform 63 and the fixing cylinder 67 and is fixedly connected to them.

[0028] In actual construction, the installation of the grouting pipe 71 needs to be precisely aligned with the center of the sleeve 66 to ensure the grouting effect and structural stability. Therefore, the sleeve 66 is positioned outside the anchor cable mechanism 7. The anchor cable mechanism 7 is further inserted through pre-embedded holes in the inclined platform 63. The sleeve 66 can be made of plastic. Multiple jet grouting piles 2 are arranged in a row at intervals, located outside the foundation pit and spaced relative to the support piles 1. The front of the capping beam 5 is positioned on the top of the support piles 1, and the rear of the capping beam 5 is positioned on the top of the jet grouting piles 2. By setting up the jet grouting piles 2 and the capping beam 5, the surrounding buildings of the foundation pit can be protected and isolated. Furthermore, the tensioning section 74 of the grouting pipe 71 is equipped with an adjustable threaded structure, allowing for precise adjustment of the tension of the steel strand 72 during tensioning to ensure the anchoring effect meets the requirements. The steel strand 72's self-... The connection between section 75 and anchoring section 76 employs a special welding method to ensure the strength and durability of the connection. The end cap 77 not only seals the anchoring section 76 but also, through its internal threaded structure, tightly engages with the anchoring section 76, further enhancing the anchoring effect. After construction, the steel strand 72 is tensioned using tensioning equipment, ensuring a tight bond between the anchoring section 76 and the soil, thereby providing sufficient pull-out resistance. The entire installation and tensioning process of the anchoring mechanism 7 must be strictly carried out in accordance with construction specifications to ensure the safety and reliability of the structure. During operation, construction personnel should use specialized tensioning equipment and testing instruments to monitor the tension and displacement in real time, ensuring that each step meets the requirements. In addition, the grouting process also requires strict control of grouting pressure and grout ratio to ensure grouting effect and avoid affecting the overall structural stability due to uneven grouting or insufficient strength.

[0029] Working principle: First, the anchor mechanism 6 effectively applies prestress to the support piles 1, thereby improving the stability and bearing capacity of the entire structure. Anchor cables are inserted into the inner wall of the anchor cable mechanism 7. Through the coordinated use of the adjusting parts 68 and 69, the magnitude and distribution of prestress can be precisely controlled, ensuring the safety and reliability of the structure under various working conditions. Furthermore, the water-retaining platform 8 effectively prevents rainwater and other liquids from eroding the support piles 1, extending the service life of the structure. The guardrail 9 provides safety for construction personnel, preventing accidents. Anchor cables are inserted into the inner wall of the soil nailing wall 10. The nail 11, together with the support pile 1, forms a robust support system, further enhancing the stability of the structure. In practical applications, the other end of the anchor cable mechanism 7 is equipped with an end cap 77. The anchor cable mechanism 7 includes multiple evenly spaced steel strands 72, with isolation frames 73 on the steel strands 72. Furthermore, there are multiple isolation frames 73, distributed on the anchoring section 76. The anchoring section 76 of the anchor cable mechanism 7 does not need to be fixed to the soil in the foundation pit, but the anchoring section 76 of the anchor cable mechanism 7 can be adjusted and set on the side wall of the support pile 1, saving space. The side wall of the support pile 1 is provided with a fixing cylinder 67 along the inclined direction. An adjusting member 68 is threadedly connected to one end of the fixed cylinder 67. The anchoring section 76 of the anchor cable mechanism 7 passes through the fixed cylinder 67 and is connected to the adjusting member 68, allowing the length of the anchor cable mechanism 7 to be adjusted by rotating the adjusting member 68, thus facilitating the adjustment of the tension of the anchor cable mechanism 7. Furthermore, half of the volume of the fixed cylinder 67 is housed within the side wall of the support pile 1. The fixed cylinder 67 has a through hole for easy passage, and the adjusting member 68 has a through hole corresponding to the through hole in the fixed cylinder 67. The anchoring section 76 of the anchor cable mechanism 7 passes through the fixed cylinder 67 and the adjusting member 68, and the end of the adjusting member 68 away from the fixed cylinder 67 is connected to the through hole. A through hole is provided vertically, through which the anchoring section 76 of the anchor cable mechanism 7 passes. Furthermore, the anchoring section 76 of the anchor cable is provided with multiple locking holes at intervals. The adjusting member 68 is also provided with an adjusting rod 69 passing through a through hole and a locking hole, so as to drive the adjusting member 68 to rotate through the adjusting rod 69, so as to facilitate the adjustment of the tension of the anchor cable mechanism 7. The tilt angle of the fixed cylinder 67 is the same as the tilt angle set by the anchor cable mechanism 7. The whole device can be widely used in various civil engineering projects. Its structure is simple, construction is convenient, and cost is low. At the same time, it has good safety performance and can meet the high requirements of modern buildings for foundation structure.

[0030] Then, during actual construction, the installation of the grouting pipe 71 needs to be precisely aligned with the center of the sleeve 66 to ensure the grouting effect and structural stability. Therefore, the sleeve 66 is located outside the anchor cable mechanism 7. The anchor cable mechanism 7 is further inserted through pre-embedded holes in the inclined platform 63. The sleeve 66 can be made of plastic. Multiple jet grouting piles 2 are arranged in a row at intervals, located outside the foundation pit and spaced relative to the support piles 1. The front side of the capping beam 5 is located on the top of the support piles 1, and the rear side is located on the top of the jet grouting piles 2. By setting the jet grouting piles 2 and the capping beam 5, the surrounding buildings of the foundation pit can be protected and isolated. Furthermore, the tensioning section 74 of the grouting pipe 71 is equipped with an adjustable threaded structure, allowing for fine adjustment of the tension of the steel strand 72 during tensioning to ensure the anchoring effect meets the requirements. The connection between the free section 75 and the anchoring section 76 of the steel strand 72 is achieved using special welding. This method ensures the strength and durability of the connection. The end cap 77 not only seals the anchoring section 76, but also, through its internal threaded structure, closely engages with the anchoring section 76, further enhancing the anchoring effect. After construction, the steel strand 72 is tensioned using tensioning equipment, ensuring a tight bond between the anchoring section 76 and the soil, thus providing sufficient pull-out resistance. The entire installation and tensioning process of the anchor cable mechanism 7 must be strictly carried out in accordance with construction specifications to ensure the safety and reliability of the structure. During operation, construction personnel should use specialized tensioning equipment and testing instruments to monitor the tension and displacement in real time, ensuring that each step meets the requirements. In addition, the grouting process also requires strict control of the grouting pressure and grout ratio to ensure the grouting effect and avoid affecting the stability of the overall structure due to uneven grouting or insufficient strength. The above is the working process of the entire device, and all contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prestressed pile anchor structure, comprising retaining piles (1), characterized in that: A jet grouting pile (2) is provided on one side of the support pile (1), a mixed soil waist beam (3) is provided on one side of the jet grouting pile (2), a spiral reinforcement (4) is embedded in the inner wall of the mixed soil waist beam (3), a cap beam (5) is fixedly connected to the upper end of the support pile (1), an anchor mechanism (6) is fixedly connected to one side of the cap beam (5), an anchor cable mechanism (7) is inserted into the inner wall of the anchor mechanism (6), a water retaining platform (8) is movably connected above the support pile (1), a guardrail (9) is fixedly connected to the upper end of the water retaining platform (8), a soil nail wall (10) is fixedly connected to one side of the upper end of the support pile (1), and an anchor nail (11) is inserted into the inner wall of the soil nail wall (10). The anchor mechanism (6) includes a bracket (61), one side of which is fixedly connected to one side of the crown beam (5). A steel section (62) is provided at the upper end of the bracket (61). An inclined platform (63) is provided on one side of the upper end of the bracket (61). A pressure plate (64) is movably connected to one side of the inclined platform (63). An anchor head (65) is detachably connected to one side of the pressure plate (64). A sleeve (66) is fixedly connected to the inner wall of the inclined platform (63). A fixed cylinder (67) is movably connected to one side of the sleeve (66). An adjusting member (68) is fixedly connected to the other side of the fixed cylinder (67). An adjusting rod (69) is inserted into one side of the inner wall of the adjusting member (68).

2. The prestressed pile anchor structure according to claim 1, characterized in that: One side of the jet grouting pile (2) is fixedly connected to one side of the support pile (1), and one side of the mixed soil waist beam (3) is fixedly connected to one side of the jet grouting pile (2).

3. A prestressed pile anchor structure according to claim 1, characterized in that: The upper end of the bracket (61) is movably connected to the lower end of the steel section (62), and one side of the upper end of the bracket (61) is fixedly connected to the lower end of the inclined platform (63).

4. A prestressed pile anchor structure according to claim 3, characterized in that: The fixed cylinder (67) is embedded and connected to one side of the support pile (1) at one end near the inclined platform (63).

5. A prestressed pile anchor structure according to claim 1, characterized in that: The anchor cable mechanism (7) includes a grouting pipe (71), the outer wall of which is inserted into the inner wall of the sleeve (66). A steel strand (72) is provided on the outer wall of the grouting pipe (71). An isolation frame (73) is provided on one side of the steel strand (72). A tensioning section (74) is opened on one side of the grouting pipe (71). A free section (75) is fixedly connected to one side of the tensioning section (74). An anchoring section (76) is fixedly connected to one side of the free section (75). An end cap (77) is fixedly connected to one end of the anchoring section (76).

6. A prestressed pile anchor structure according to claim 5, characterized in that: The outer wall of the grouting pipe (71) is fixedly connected to the inner wall of the steel strand (72), and one side of the steel strand (72) is fixedly connected to one side of the isolation frame (73).

7. A prestressed pile anchor structure according to claim 5, characterized in that: The outer wall of the grouting pipe (71) passes through the inclined platform (63) and the fixed cylinder (67) and is fixedly connected to them.

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