A grouting device for PHC pipe piles

Abstract

The present invention discloses a grouting device for PHC pipe piles, which belongs to the technical field of PHC pipe pile construction. The grouting device for PHC pipe piles of the present invention comprises a telescopic drill rod and a lifting rod, a high-pressure rotary jet drill for grouting in the PHC pipe pile is installed below the lifting rod, and a rotary drilling rig for rotary expansion construction is installed below the telescopic drill rod; a connecting plate is installed below the rotating plate, and the connecting plate is connected to the connecting seat by fixing bolts, and a fastening plate is installed between the fixing seat and the connecting frame, and the fastening plate is used to fix the crane. The present invention solves the problem that in the actual use of the existing grouting device, large machinery is inconvenient to operate before and after grouting, and the grouting position is prone to errors. The present invention can drive the connecting plate and the connecting seat to rotate by rotating the rotating plate, so that the positions of the rotary drilling rig and the high-pressure rotary jet drill are flipped, so as to quickly perform rotary drilling and grouting work, and precisely adjust to ensure the best positioning effect.

Description

Technical Field

[0001] The invention relates to the technical field of PHC pipe pile construction, in particular to a grouting device for PHC pipe piles. Background Art

[0002] HC prestressed concrete pipe piles are characterized by high strength, convenient and fast construction, and high single pile bearing capacity. They are a common type of pile foundation in high-rise buildings. The PHC pipe pile post-grouting process uses a grouting device to add a grouting device to the pile end and adopts the static pile pressure method to grout the PHC pipe pile through a guide tube, which will greatly improve the bearing capacity of the single pile.

[0003] Chinese patent publication number CN114960639A discloses a PHC pipe pile grouting device, comprising a grouting device body and a pipe pile body, wherein the grouting device body comprises a barrel, reinforcing ribs, a grouting pipe joint, a grouting hole, a bottom plate, and a top plate. The side walls of each reinforcing rib are fixedly connected to a plurality of protective boxes arranged in an array, and each protective box is fixedly sleeved on the side wall of the grouting hole. Each protective box has a slurry outlet on the side wall away from the grouting hole, and the side wall of the slurry outlet is provided with a sealing plate, and the inner side wall of the sealing plate is fixedly connected to a first fixing block. The grouting hole can be fully protected before grouting to prevent soil and other substances from entering the grouting hole, thereby ensuring the efficiency and effect of subsequent grouting. At the same time, during the grouting process, the slurry outlet can be automatically opened by utilizing the impact force of the slurry flow, and normal grouting can be achieved after the slurry flows out through the slurry outlet. Furthermore, the air between the grouting device body and the pile hole can be discharged to avoid defects such as air holes after grouting, thereby ensuring the quality of grouting.

[0004] In actual use, the grouting device of the above patent is inconvenient to operate with large machinery before and after grouting, and the grouting position is prone to errors, affecting the construction effect; therefore, it does not meet existing needs. In this regard, we propose a grouting device for PHC pipe piles. Summary of the Invention

[0005] The purpose of the present invention is to provide a grouting device for PHC pipe piles, which solves the problems that the grouting device proposed in the above background technology is inconvenient to operate large machinery before and after grouting during actual use, and the grouting position is prone to errors.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a grouting device for PHC pipe piles, comprising a telescopic drill rod and a lifting rod, wherein the lifting rod is arranged on one side of the telescopic drill rod, and a high-pressure jet grouting drill for grouting in the PHC pipe pile is installed below the lifting rod, and a rotary drilling rig for rotary expansion construction is installed below the telescopic drill rod;

[0007] It also includes a connecting seat, which is arranged outside the telescopic drill rod and the lifting rod, and is used to connect and limit the position of the telescopic drill rod and the lifting rod;

[0008] A fixing seat for mounting the adjustment mechanism is located behind the connecting seat, a first hydraulic cylinder and a second hydraulic cylinder are mounted on the upper end of the fixing seat, and a fastening plate is mounted on the rear end of the fixing seat;

[0009] A rotating plate for adjusting the position of the telescopic drill rod and the lifting rod is installed in front of the fixed seat, and a connecting plate is installed below the rotating plate. The connecting plate is connected to the connecting seat by fixing bolts;

[0010] A connecting frame for connecting a crane is installed at the lower end of a fixing seat. A fastening plate is installed between the fixing seat and the connecting frame. The fastening plate is used to fix the crane.

[0011] Preferably, the telescopic drill rod and the lifting rod both pass through the connecting seat and are slidably connected to the connecting seat through a sleeve. A spiral drilling tool is installed at the lower end of the rotary drilling rig, and a first lifting seat is installed at the upper end of the rotary drilling rig, and a second lifting seat is installed on the outside of the lifting rod.

[0012] Preferably, two hydraulic sleeves are installed at the rear end of the connecting seat, hydraulic guide rods are installed inside the two hydraulic sleeves, and the lower ends of the two hydraulic guide rods are fixedly connected to the first lifting seat and the second lifting seat respectively.

[0013] Preferably, the lifting rod is connected to the high-pressure rotary jet drilling rig by fixing bolts, a grouting head is installed at the lower end of the high-pressure rotary jet drilling rig, and a grouting pipe is installed at the upper end of the high-pressure rotary jet drilling rig, the grouting pipe is used to connect the grouting pump, and a Beidou positioning module is installed on the outside of the high-pressure rotary jet drilling rig, and the Beidou positioning module is used for pile point positioning.

[0014] Preferably, a first boom is installed on the upper end of the telescopic drill rod, a second boom is installed on the upper end of the lifting rod, and a lifting frame is installed on the upper ends of the two hydraulic sleeves, and the upper ends of the first boom and the second boom are fixedly connected to the two lifting frames respectively.

[0015] Preferably, one end of the first hydraulic cylinder and the second hydraulic cylinder are movably connected to the fixing seat through a connecting ear, and the other end of the first hydraulic cylinder and the second hydraulic cylinder are movably connected to the rotating plate through a connecting ear.

[0016] Preferably, a fixed shaft is connected between the rotating plate and the connecting disk, a balancing rod is installed outside the fixed shaft, and two ends of the balancing rod are fixedly connected to the connecting disk and the rotating plate respectively.

[0017] Preferably, a support frame is installed at the upper end of the connecting frame, the support frame is connected to the fastening plate by fixing screws, and a positioning clamp is installed at the bottom of the support frame, a third hydraulic cylinder is installed inside the support frame, and one end of the third hydraulic cylinder extends to the outside of the support frame and is fixedly connected to the positioning clamp.

[0018] Preferably, a counterweight block is connected to the lower end of the fixing seat, and the counterweight block is connected to the fixing seat by fixing screws. A reinforcing rib runs through the inside of the counterweight block, and both ends of the reinforcing rib are respectively welded to the bottom of the fixing seat, and the fastening plate is fixedly connected to the counterweight block by fastening bolts.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention respectively arranges a rotary drilling rig and a high-pressure rotary jet drilling rig in the grouting device, and installs a connecting seat and a fixing seat between the two large machines. The position of the rotating plate can be adjusted by two corresponding first hydraulic cylinders and second hydraulic cylinders on the upper end of the fixing seat. The rotation of the rotating plate can drive the connecting plate and the connecting seat to rotate, so that the positions of the rotary drilling rig and the high-pressure rotary jet drilling rig are flipped, thereby performing adjustment work at the fastest speed to facilitate rapid rotary drilling and grouting work, with good adaptability, and a stable folding angle position. Through the transmission and precise adjustment of the two sets of hydraulic cylinders, the best positioning effect is guaranteed, thereby improving the construction quality.

[0021] The present invention installs a Beidou positioning module on the outside of the high-pressure rotary jet drilling rig, and locates the pile point through the indication and guidance of coordinates. Then, the prefabricated pipe pile is placed into the pile hole using a lifting device, and the bottom of the pipe pile is sunk to the bottom of the pile hole to ensure the accuracy of the pile placement point. At the same time, after the pile is connected, a pneumatic rotary pile driver is used to continue to statically pressurize the PHC pipe pile to drive the pile again, ensuring that the pile connection does not deviate in the horizontal direction during piling, thereby further improving the work quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a front axonometric view of the present invention;

[0023] Figure 2 is a rear axonometric view of the present invention;

[0024] Figure 3 is a top-down axonometric view of the present invention;

[0025] Figure 4 It is an axonometric view of the present invention from a bottom view;

[0026] Figure 5 For the present invention Figure 4 A partial enlarged view of area A in the middle;

[0027] Figure 6This is an axonometric view of the rotary drilling rig and the high-pressure rotary jet drilling rig of the present invention after being turned over;

[0028] Figure 7 It is a structural schematic diagram of the crane connection of the present invention.

[0029] In the figure: 1. Telescopic drill rod; 101. Rotary drilling rig; 102. Spiral drilling tool; 103. First lifting seat; 104. First boom; 2. Lifting rod; 201. High-pressure rotary jet drilling rig; 202. Spraying head; 203. Beidou positioning module; 204. Second lifting seat; 205. Second boom; 206. Grouting pipe; 3. Connecting seat; 301. Lifting frame; 302. Hydraulic sleeve; 303. Hydraulic guide rod; 4. Fixed seat; 401. First hydraulic cylinder; 402. Second hydraulic cylinder; 403. Reinforcement rib; 404. Counterweight; 405. Fastening plate; 5. Rotating plate; 501. Connecting plate; 502. Fixed shaft; 503. Balance bar; 6. Connecting frame; 601. Support frame; 602. Positioning splint; 603. Third hydraulic cylinder; 7. Crane. Implementation Method

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In order to solve the problem that the existing large-scale machinery is inconvenient to operate before and after grouting, and the grouting position is prone to errors, which affects the construction effect, please refer to Figure 1 - Figure 3 、 Figure 7 , this embodiment provides the following technical solutions:

[0032] A grouting device for PHC pipe piles, comprising a telescopic drill rod 1 and a lifting rod 2. The lifting rod 2 is arranged on one side of the telescopic drill rod 1, and a high-pressure jet grouting drill 201 for grouting in the PHC pipe pile is installed below the lifting rod 2. A rotary drilling rig 101 for rotary expansion construction is installed below the telescopic drill rod 1.

[0033] It also includes a connecting seat 3, which is arranged outside the telescopic drill rod 1 and the lifting rod 2, and is used to connect and limit the position of the telescopic drill rod 1 and the lifting rod 2;

[0034] The fixing base 4 for mounting the adjustment mechanism is located behind the connecting base 3. The first hydraulic cylinder 401 and the second hydraulic cylinder 402 are mounted on the upper end of the fixing base 4, and a fastening plate 405 is mounted on the rear end of the fixing base 4.

[0035] The rotating plate 5, which is used to adjust the position of the telescopic drill rod 1 and the lifting rod 2, is installed in front of the fixed base 4. A connecting plate 501 is installed below the rotating plate 5. The connecting plate 501 is connected to the connecting base 3 by fixing bolts;

[0036] The connecting frame 6 for connecting the crane 7 is installed at the lower end of the fixing seat 4 . A fastening plate 405 is installed between the fixing seat 4 and the connecting frame 6 . The fastening plate 405 is used to fix the crane 7 .

[0037] Specifically, by installing a connecting seat 3 and a fixing seat 4 between two large machines, the position of the rotating plate 5 can be adjusted through the two corresponding first hydraulic cylinders 401 and second hydraulic cylinders 402 on the upper end of the fixing seat 4. The rotation of the rotating plate 5 can drive the connecting plate 501 and the connecting seat 3 to rotate, so that the positions of the rotary drilling rig 101 and the high-pressure rotary jet drilling rig 201 are flipped, so that the adjustment work can be carried out at the fastest speed to facilitate rapid rotary drilling and grouting work, with good adaptability and stable folding angle position. Through the transmission and precise adjustment of the two sets of hydraulic cylinders, the best positioning effect is guaranteed, thereby improving the construction quality.

[0038] In order to solve the technical problem that the mechanical adjustment method is complicated and affects the working effect in the existing technology, please refer to Figure 1 - Figure 4 , providing the following technical solutions:

[0039] The telescopic drill rod 1 and the lifting rod 2 both pass through the connecting seat 3 and are slidably connected to the connecting seat 3 by a sleeve. A spiral drilling tool 102 is installed at the lower end of the rotary drilling rig 101, and a first lifting seat 103 is installed at the upper end of the rotary drilling rig 101. A second lifting seat 204 is installed on the outside of the lifting rod 2. The spiral drilling tool 102 is used to rotary drill holes until the holes penetrate the hard rock layer to the designed elevation and the PHC pipe piles can enter the bearing layer. Continuous drilling should be ensured during the rotary drill hole process to prevent the occurrence of hole collapse in the water-rich soil layer area of ​​the foundation. This solves the problem that the PHC pipe piles are difficult to enter the bearing layer when the geological standard penetration degree is large and can meet the designed effective pile length of the pile foundation.

[0040] Under the combined action of high-pressure water, high-pressure gas, and high-frequency vibration of the impactor, the soil around the rotary drilling rig 101 quickly collapses and is in a plastic or suspended state. Prefabricated pipe piles are implanted into the existing cement-soil piles through static pressure or hammering to form cement-soil composite pipe piles, thereby achieving the purpose of softening the stratum to facilitate the implantation of pipe piles and improving the bearing capacity of single piles.

[0041] Two hydraulic sleeves 302 are installed at the rear end of the connecting seat 3. Hydraulic guide rods 303 are installed inside the two hydraulic sleeves 302. The lower ends of the two hydraulic guide rods 303 are fixedly connected to the first lifting seat 103 and the second lifting seat 204 respectively.

[0042] The upper end of the telescopic drill rod 1 is installed with a first boom 104, the upper end of the lifting rod 2 is installed with a second boom 205, and the upper ends of the two hydraulic sleeves 302 are installed with lifting frames 301, and the upper ends of the first boom 104 and the second boom 205 are fixedly connected to the two lifting frames 301 respectively.

[0043] Specifically, during use, the telescopic drill rod 1 and the lifting rod 2 are fixed by using the first lifting seat 103 and the second lifting seat 204, so that the rotary drilling rig 101 and the high-pressure rotary jet drilling rig 201 are hydraulically lifted and lowered by the hydraulic guide rod 303 during the lifting operation, which is convenient for operation, and the positions of the telescopic drill rod 1 and the lifting rod 2 are stabilized respectively by the first lifting rod 104 and the second lifting rod 205, so that the rotary drilling rig 101 and the high-pressure rotary jet drilling rig 201 maintain position stability during operation.

[0044] In order to solve the technical problem of poor grouting position accuracy in the existing technology, which affects subsequent work, please refer to Figure 4 - Figure 5 , providing the following technical solutions:

[0045] The lifting rod 2 is connected to the high-pressure rotary jet drilling rig 201 by fixing bolts. The lower end of the high-pressure rotary jet drilling rig 201 is equipped with a grouting head 202, and the upper end of the high-pressure rotary jet drilling rig 201 is equipped with a grouting pipe 206, which is used to connect the grouting pump. The outside of the high-pressure rotary jet drilling rig 201 is equipped with a Beidou positioning module 203, which is used for pile point positioning. The high-pressure rotary jet drilling rig 201 is used to align the bottom elevation of the lead hole to the bottom elevation of the PHC pipe pile. Rotary grouting is carried out from bottom to top inside the PHC pipe pile to enhance the vertical compressive bearing capacity of the PHC pipe pile. With the help of the pipe pile as a conduit, the mortar with good fluidity is directly injected into the pipe from the top of the pile pipe. The liquid potential energy and head difference are used to achieve the slag removal at the bottom of the pile hole. As the mortar is continuously injected, the pipe pile sinks under its own weight and falls into the surface of the bearing layer, so that the space between the pipe wall and the rock and soil layer of the hole wall is filled with mortar, and finally the pipe pile is implanted, which improves the effect when the pile foundation is an end-bearing pile or an embedded pile.

[0046] Specifically, a Beidou positioning module 203 is installed on the outside of the high-pressure rotary jet drilling rig 201, and the pile point is positioned through the indication and guidance of the coordinates. Then, the prefabricated pipe pile is placed into the pile hole using a lifting device, and the bottom of the pipe pile is sunk to the bottom of the pile hole to ensure the accuracy of the pile placement point. At the same time, after the pile is connected, a pneumatic rotary pile driver is used to continue to statically pressurize the PHC pipe pile to drive the pile again, ensuring that the pile connection does not shift in the horizontal direction during piling, thereby further improving the work quality.

[0047] In order to solve the technical problem that the mechanical position adjustment is not stable enough in the existing technology, which affects the working quality, please refer to Figure 1 、 Figure 3 、 Figure 6 , providing the following technical solutions:

[0048] One end of the first hydraulic cylinder 401 and the second hydraulic cylinder 402 are movably connected to the fixing seat 4 through the connecting ear, and the other end of the first hydraulic cylinder 401 and the second hydraulic cylinder 402 are movably connected to the rotating plate 5 through the connecting ear.

[0049] A fixed shaft 502 is connected between the rotating plate 5 and the connecting disk 501 . A balancing rod 503 is installed outside the fixed shaft 502 . Both ends of the balancing rod 503 are fixedly connected to the connecting disk 501 and the rotating plate 5 , respectively.

[0050] Specifically, when the machine needs to be moved, by contracting or extending the first hydraulic cylinder 401 and the second hydraulic cylinder 402, one end of the first hydraulic cylinder 401 and the second hydraulic cylinder 402 pushes the rotating plate 5 to move, and the rotating plate 5 drives the connecting disk 501 to rotate through the fixed shaft 502, and the connecting disk 501 drives the connecting seat 3 to move, so that the positions of the two ends of the connecting seat 3 are flipped. During the flipping process, the overall position of the device is kept stable by the fixed shaft 502 and the balance bar 503. The structure is simple, convenient for long-term use, and convenient for maintenance and repair.

[0051] In the existing technology, the grouting device is not convenient to connect with the crane, which affects the work efficiency. Figure 6 - Figure 7 , providing the following technical solutions:

[0052] A support frame 601 is installed at the upper end of the connecting frame 6, and the support frame 601 is connected to the fastening plate 405 by fixing screws, and a positioning clamping plate 602 is installed at the bottom of the support frame 601. A third hydraulic cylinder 603 is installed inside the support frame 601, and one end of the third hydraulic cylinder 603 extends to the outside of the support frame 601 and is fixedly connected to the positioning clamping plate 602.

[0053] The lower end of the fixed seat 4 is connected to a counterweight block 404, which is connected to the fixed seat 4 by fixing screws. A reinforcing rib 403 runs through the inside of the counterweight block 404, and the two ends of the reinforcing rib 403 are respectively welded to the bottom of the fixed seat 4, and the fastening plate 405 is fixedly connected to the counterweight block 404 by fastening bolts.

[0054] Specifically, after each position adjustment, the third hydraulic cylinder 603 is extended to drive the positioning clamp 602 to move, and the upper and lower ends of the positioning clamp 602 limit the outside of the connecting seat 3 or the connecting plate 501, and are fixed by the card slot. After positioning, it can maintain sufficient stability for rotary drilling work. After the device is connected to the crane 7 through the support frame 601, it maintains sufficient position stability, and then the counterweight block 404 and the fastening plate 405 are used to further improve the support strength, which is convenient for installation and has good position stability.

[0055] Working principle: After the device is connected to the crane 7 through the support frame 601, it maintains sufficient position stability, and then the counterweight block 404 and the fastening plate 405 are used to further improve the support strength, which is convenient for installation and adjustment of the position of the crane 7. The first lifting seat 103 and the second lifting seat 204 are used to fix the telescopic drill rod 1 and the lifting rod 2, so that the rotary drilling rig 101 and the high-pressure rotary jet drilling rig 201 are hydraulically lifted and lowered through the hydraulic guide rod 303 during the lifting work, and the spiral drilling tool 102 is used to perform rotary drilling and hole guiding until the hole penetrates the hard rock layer to the designed elevation. After that, the PHC pipe pile can enter the bearing layer. Continuous drilling should be ensured during the rotary drilling and hole guiding process to prevent the occurrence of hole collapse in the water-rich soil layer area of ​​the foundation, which solves the problem of large geological standard penetration. The problem that PHC pipe piles are difficult to enter the bearing layer and can meet the designed effective pile length of the pile foundation, under the linkage effect of high-pressure water, high-pressure gas, and high-frequency vibration of the impactor, the soil around the rotary drilling rig 101 quickly collapses and is in a plastic or suspended state, and the prefabricated pipe piles are implanted into the formed cement soil piles by static pressure or hammering to form cement soil composite pipe piles, so as to achieve the purpose of softening the stratum to smoothly implant the pipe piles and at the same time improve the bearing capacity of the single pile. After installation, by contracting or extending the first hydraulic cylinder 401 and the second hydraulic cylinder 402, one end of the first hydraulic cylinder 401 and the second hydraulic cylinder 402 pushes the rotating plate 5 to move, and the rotating plate 5 drives the connecting plate 501 to rotate through the fixed shaft 502, and the connecting plate 501 drives the connecting seat 3 to move, so that the connecting plate 501 can move. The two ends of the receiving seat 3 are flipped. During the flipping process, the overall position of the device is kept stable by the fixed shaft 502 and the balance bar 503. The structure is simple, so that the positions of the rotary drilling rig 101 and the high-pressure rotary jet drilling rig 201 can be flipped, so that the adjustment work can be carried out at the fastest speed, so as to quickly perform rotary drilling and grouting work. It has good adaptability, and the flipping angle position is stable. Through the transmission and precise adjustment of two groups of hydraulic cylinders, the best positioning effect is guaranteed, and the construction quality is improved. The Beidou positioning module 203 is installed on the outside of the high-pressure rotary jet drilling rig 201, and the pile point is positioned by the indication and guidance of the coordinates. Then, the prefabricated pipe pile is placed in the pile hole by using the lifting equipment, and the bottom of the pipe pile sinks to the bottom of the pile hole to ensure the accuracy of the pile point. When the PHC pipe pile is continued to be statically pressed after the pile is laid, a pneumatic rotary pile driver is used to drive the pile again to ensure that the pile connection does not deviate in the horizontal direction during piling, which further improves the work quality. A high-pressure rotary jet drilling rig 201 is used to perform rotary grouting from the bottom elevation of the pilot hole to the bottom elevation of the PHC pipe pile. Rotary grouting is performed from bottom to top inside the PHC pipe pile to enhance the vertical compressive bearing capacity of the PHC pipe pile. The pipe pile is used as a guide tube to allow mortar with good fluidity to be directly injected into the pipe from the top of the pile pipe. The liquid potential energy and head difference are used to achieve slag removal at the bottom of the pile hole. As the mortar is continuously injected, the pipe pile sinks under its own weight and falls into the surface of the bearing layer, so that the space between the pipe wall and the rock and soil layer of the hole wall is filled with mortar, and finally the pipe pile is implanted, which improves the effect when the pile foundation is an end-bearing pile or an embedded pile.

[0056] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A grouting device for PHC piles, comprising a telescopic drill rod (1) and a lifting rod (2), characterized in that: The lifting rod (2) is arranged on one side of the telescopic drill rod (1), and a high-pressure rotary jet drilling rig (201) for grouting in the PHC pipe pile is installed below the lifting rod (2), and a rotary drilling rig (101) for rotary expansion construction is installed below the telescopic drill rod (1); It also includes a connecting seat (3) which is arranged outside the telescopic drill rod (1) and the lifting rod (2), and the connecting seat (3) is used to connect and limit the position of the telescopic drill rod (1) and the lifting rod (2); A fixing seat (4), the fixing seat (4) for mounting the adjustment mechanism is located behind the connecting seat (3), a first hydraulic cylinder (401) and a second hydraulic cylinder (402) are mounted on the upper end of the fixing seat (4), and a fastening plate (405) is mounted on the rear end of the fixing seat (4); A rotating plate (5) for adjusting the positions of the telescopic drill rod (1) and the lifting rod (2) is installed in front of the fixed seat (4), and a connecting plate (501) is installed below the rotating plate (5), and the connecting plate (501) is connected to the connecting seat (3) via fixing bolts; A connecting frame (6) for connecting a crane (7) is installed at the lower end of the fixing seat (4), and a fastening plate (405) is installed between the fixing seat (4) and the connecting frame (6), and the fastening plate (405) is used to fix the crane (7); The telescopic drill rod (1) and the lifting rod (2) both pass through the connecting seat (3) and are slidably connected to the connecting seat (3) via a sleeve; a spiral drilling tool (102) is installed at the lower end of the rotary drilling rig (101); a first lifting seat (103) is installed at the upper end of the rotary drilling rig (101); and a second lifting seat (204) is installed outside the lifting rod (2); Two hydraulic sleeves (302) are installed at the rear end of the connecting seat (3), and hydraulic guide rods (303) are installed inside the two hydraulic sleeves (302). The lower ends of the two hydraulic guide rods (303) are fixedly connected to the first lifting seat (103) and the second lifting seat (204), respectively.

2. A grouting device for PHC piles according to claim 1, characterized in that: The lifting rod (2) is connected to the high-pressure rotary jet drilling rig (201) via fixing bolts; a grouting head (202) is installed at the lower end of the high-pressure rotary jet drilling rig (201); and a grouting pipe (206) is installed at the upper end of the high-pressure rotary jet drilling rig (201); the grouting pipe (206) is used to connect a grouting pump; a Beidou positioning module (203) is installed outside the high-pressure rotary jet drilling rig (201); the Beidou positioning module (203) is used for pile point positioning.

3. A grouting device for PHC piles according to claim 2, characterized in that: A first suspension rod (104) is installed at the upper end of the telescopic drill rod (1), a second suspension rod (205) is installed at the upper end of the lifting rod (2), and a lifting frame (301) is installed at the upper ends of the two hydraulic sleeves (302), and the upper ends of the first suspension rod (104) and the second suspension rod (205) are fixedly connected to the two lifting frames (301) respectively.

4. A grouting device for PHC piles according to claim 3, characterized in that: One end of the first hydraulic cylinder (401) and the second hydraulic cylinder (402) are both movably connected to the fixed seat (4) via a connecting ear, and the other end of the first hydraulic cylinder (401) and the second hydraulic cylinder (402) are both movably connected to the rotating plate (5) via a connecting ear.

5. The grouting device for PHC piles according to claim 4, characterized in that: A fixed shaft (502) is connected between the rotating plate (5) and the connecting disk (501), a balancing rod (503) is installed outside the fixed shaft (502), and two ends of the balancing rod (503) are fixedly connected to the connecting disk (501) and the rotating plate (5), respectively.

6. The grouting device for PHC piles according to claim 5, characterized in that: A support frame (601) is installed at the upper end of the connecting frame (6), the support frame (601) is connected to the fastening plate (405) by fixing screws, and a positioning clamping plate (602) is installed below the support frame (601), and a third hydraulic cylinder (603) is installed inside the support frame (601), and one end of the third hydraulic cylinder (603) extends to the outside of the support frame (601) and is fixedly connected to the positioning clamping plate (602).

7. The grouting device for PHC piles according to claim 6, characterized in that: The lower end of the fixing seat (4) is connected to a counterweight (404), and the counterweight (404) is connected to the fixing seat (4) via fixing screws. A reinforcing rib (403) runs through the interior of the counterweight (404), and both ends of the reinforcing rib (403) are respectively welded to the bottom of the fixing seat (4), and the fastening plate (405) is fixedly connected to the counterweight (404) via fastening bolts.

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