A water injection grouting type spiral anchor foundation and construction method

Abstract

The present invention discloses a water-injection grouting type spiral anchor foundation and construction method, which relates to the technical field of spiral anchor foundation, including a spiral anchor, a connector and a plurality of water injection units, the connector including a tube and a connecting pipe, the only open end of the tube being detachably sealed and docked with the top opening of the anchor rod, the connecting pipe passing through the side wall of the connecting tube, the inner end of which is located inside the tube, and the outer end being used to connect a grouting machine; each water injection unit is connected in sequence, and is movably arranged inside the anchor rod and corresponding to each group of grouting holes, each water injection unit including an inner tube tightly fitted with the inner side wall of the anchor rod, a plurality of nozzles being provided on the tube wall of the inner tube, each nozzle corresponding to each grouting hole of the corresponding grouting hole group. The present invention can generate a water channel around the anchor rod by water injection, and then inject grout into the water channel, thereby expanding the grouting range and improving the bearing capacity of the spiral anchor foundation, and can also use a grouting machine for water injection construction to generate a water injection pressure higher than that of grouting.

Description

Technical Field

[0001] This invention relates to the field of spiral anchor foundation technology, specifically to a water-injected grouting spiral anchor foundation and its construction method. Background Technology

[0002] A spiral anchor foundation is an anchoring structure that penetrates deep into the soil to resist its resistance. It is driven into the soil layer by applying a certain torque to the top of the anchor rod mechanically. The spiral anchor foundation with post-grouting method is an improved anchoring structure based on the traditional spiral anchor foundation. It is improved by adding a grouting system and performing pressure grouting after the anchor body is driven into the soil. This improves the properties of the soil around the anchor body and enhances the interfacial bonding between the anchor body and the soil, thereby significantly improving the bearing capacity of the foundation.

[0003] Patent CN215669471U discloses a grouting-type composite spiral anchor pile foundation, including an anchor rod and an anchor plate fixedly connected to the side wall of the anchor rod and rotating spirally around it. It also includes a high-pressure grouting pipe disposed inside the anchor rod and extending to the outside of the anchor rod, with a high-pressure grouting hole at the end of the high-pressure grouting pipe. This design enhances the bearing capacity of the spiral anchor while reducing the variability of the spiral anchor foundation's bearing capacity and decreasing the amount of steel used.

[0004] Patent CN221878155U discloses a spiral anchor foundation, including an anchor rod, a bearing platform, and a high-pressure grouting pipe. The anchor rod is connected to the bearing platform, and an anchor head is provided at the end of the anchor rod away from the bearing platform. An anchor plate is fixedly connected to the outer peripheral wall of the anchor rod. A hollow channel is provided inside the anchor rod, and the high-pressure grouting pipe is disposed within the hollow channel. Grouting holes are provided on the outer wall of the anchor rod, and the output end of the high-pressure grouting pipe is connected to the grouting holes. The input end of the high-pressure grouting pipe has a connector that can be connected to the grouting pipe of a grouting machine. This design can improve the pull-out resistance and bearing capacity of the spiral anchor foundation, thereby improving the operational safety of power transmission lines.

[0005] As with the aforementioned patents, the termination condition for grouting of spiral anchor foundations in the prior art is that the grouting volume reaches the design value or grout is observed to emerge from the ground. Since the anchor disc disturbs the soil around the anchor rod during the spiral anchor's insertion into the ground, during subsequent grouting operations, the cement grout injected underground through the anchor rod spreads a short distance around the anchor rod and usually flows up to the ground along the soil near the anchor rod. Therefore, the diffusion range of underground cement grout is limited, thereby limiting the bearing capacity of the spiral anchor foundation, especially in geology such as fine sand and sandy soil. Summary of the Invention

[0006] The purpose of this invention is to provide a water-injected grouting spiral anchor foundation and its construction method, so as to solve the problem that the diffusion range of the cement grout injected underground in the prior art is limited, which restricts the bearing capacity of the spiral anchor foundation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a water-injected grouting spiral anchor foundation, comprising a hollow anchor rod and at least one anchor plate and multiple sets of grouting holes located in the lower section of the anchor rod, further comprising: a connector, comprising a tube and a connecting pipe, wherein the only open end of the tube is detachably sealed to the top of the anchor rod, the connecting pipe penetrates the side wall of the connecting tube, its inner end is located inside the tube, and its outer end is used to connect to a grouting machine; multiple sequentially connected water injection units, which are movably arranged inside the anchor rod and correspond one-to-one with each set of grouting holes, each water injection unit comprising an inner cylinder that is tightly fitted to the inner side wall of the anchor rod, and multiple nozzles are provided through the inner cylinder wall, each nozzle corresponding one-to-one with each grouting hole of the corresponding grouting hole set, and each water injection unit having a water injection position for aligning its nozzles with the corresponding grouting holes during the axial movement along the anchor rod.

[0008] Furthermore, the top of the anchor rod is provided with a first flange, and the open end of the pipe is provided with a second flange that connects and mates with the first flange.

[0009] Furthermore, the inner cylinder of the water injection unit includes a rigid pipe and a rubber sleeve covering the outer wall of the rigid pipe, and the nozzle penetrates both the rigid pipe and the rubber sleeve.

[0010] Furthermore, the inner cylinders of each water injection unit are connected by a connecting rod, and a tie rod is axially and slidably connected to the tube, with the bottom of the tie rod connected to the uppermost water injection unit.

[0011] Furthermore, the inner cylinder is provided with slots at both ends, and the bottom of the pull rod and the two ends of the connecting rod are provided with clips that engage with the slots.

[0012] Furthermore, each of the water injection units also has a pressurization station that closes the corresponding grouting hole group in the inner cylinder during the process of moving along the anchor rod axis. When any part of the water injection unit is in the water injection station, the other part of the water injection unit is in the pressurization station.

[0013] Furthermore, the inner end of the connecting pipe is connected to an inner pipe, which is coaxial with the anchor rod and extends into the anchor rod. A cavity is formed between the outer wall of the inner pipe and the inner wall of the anchor rod. During the process of each water injection unit moving along the axial direction of the anchor rod, there is also a grouting station located in the cavity. When each water injection unit is located in the grouting station, the water injection unit located at the bottom is sealed and fitted with the outer wall of the inner pipe through the sealing ring at its bottom.

[0014] Furthermore, a limiting part is fixedly provided on the pull rod, and an exhaust groove is provided on the side of the pull rod that penetrates the limiting part. When each water injection unit is located at the grouting position, the limiting part abuts against the top of the pipe, and the exhaust groove penetrates the top of the pipe to connect the inside and outside of the pipe.

[0015] Furthermore, the sealing ring includes a rigid ring and a rubber ring embedded in the inner wall of the rigid ring.

[0016] This invention also provides a construction method for a water-injected grouting spiral anchor foundation, comprising the following steps: S1, connecting the top of the anchor rod to a spiral anchor drilling machine, causing the anchor rod to be screwed into the ground to a predetermined depth, and then removing the spiral anchor drilling machine from the anchor rod; S2, installing a connector with multiple water injection units onto the anchor rod, inserting each water injection unit into the interior of the anchor rod, and sealing the open end of the pipe to the top of the anchor rod, with the outer end of the connecting pipe connected to the output pipe of the grouting machine; S3, adjusting the water injection unit to the water injection position, and the grouting machine pumping water into the anchor rod through the connecting pipe, the water jet from the nozzle passing through the grouting hole flushing the soil around the anchor rod to create waterways extending to a distance; S4, adjusting the water injection unit to be removed from the water injection position to expose each grouting hole, and the grouting machine pumping cement slurry into the anchor rod through the connecting pipe, the cement slurry being injected into the waterway through the grouting hole, and stopping the grouting when the cement slurry breaks through the waterway and surges to the ground, removing the connector and taking out each water injection unit; S5, completing the construction after 24 hours of curing.

[0017] Compared with the prior art, the present invention provides a water-injected grouting spiral anchor foundation, (1) with an adjustable water injection unit. The water injection unit located at the water injection position sprays high-pressure water lines into the soil around the anchor rod through the grouting hole, thereby flushing out a long waterway to the distance of the anchor rod. Then the water injection unit is adjusted to leave the water injection position. When grouting is carried out later, the cement slurry is injected into the waterway through the grouting hole. The grouting pressure can also make the cement slurry in the waterway penetrate into the waterway, thereby greatly increasing the range of cement slurry diffusion to the anchor rod, so that the bearing capacity of the spiral anchor foundation can be greatly improved, especially the bearing capacity of silty sand, sandy soil and other geological formations is significantly improved; (2) Since the nozzle aperture is much smaller than the grouting hole aperture, and the flow viscosity (resistance) of water is less than the flow viscosity of cement slurry, the grouting machine used for grouting can be shared when water is injected. Under the same power of the grouting machine, the pressure of the water line injected into the soil is much greater than the pressure of the cement slurry injected, so that a longer waterway can be flushed out without the need to provide a larger power pump. Attached Figure Description

[0018] To provide a clearer description of the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.

[0019] Figure 1 A schematic diagram of the structure during water injection provided in the embodiment;

[0020] Figure 2 A top view of the structure during water injection provided for an embodiment;

[0021] Figure 3 for Figure 2A structural cross-sectional view along line AA in the middle;

[0022] Figure 4 This is a cross-sectional view of the structure during pressurized water injection provided in the embodiment;

[0023] Figure 5 This is a schematic diagram of the structure during grouting provided in the embodiment;

[0024] Figure 6 A cross-sectional view of the structure during water injection provided for an embodiment;

[0025] Figure 7 A schematic diagram of the connector structure provided in the embodiment;

[0026] Figure 8 A schematic diagram of the structure of multiple sequentially connected water injection units provided for an embodiment;

[0027] Figure 9 This is a schematic diagram of the connection structure between the water injection unit and the connecting rod provided in the embodiment;

[0028] Figure 10 This is a schematic diagram of the connection structure between the water injection unit and the sealing ring provided in the embodiment;

[0029] Figure 11 A cross-sectional view of the connection structure between the water injection unit and the sealing ring provided in the embodiment.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Spiral anchor; 11. Anchor bolt; 12. Anchor plate; 13. Grouting hole; 14. First flange; 2. Connector; 21. Pipe; 22. End seal; 23. Second flange; 24. Connecting pipe; 25. Inner pipe; 3. Water injection unit; 31. Inner cylinder; 311. Rigid pipe; 312. Rubber sleeve; 32. Nozzle; 33. Slot; 34. Connecting rod; 35. Pull rod; 36. Limiting part; 37. Vent groove; 38. Pull handle; 4. Sealing ring; 41. Rigid ring; 42. Rubber ring. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Please see Figures 1-11This invention provides a water-injected grouting spiral anchor foundation, comprising a spiral anchor 1, a connector 2, and multiple water injection units 3. The spiral anchor 1 includes an anchor rod 11 with a hollow internal structure. The top of the anchor rod 11 is provided with a first flange 14. The middle and lower section of the anchor rod 11 is provided with at least one anchor plate 12 and multiple sets of grouting hole groups. In this embodiment, the number of anchor plates 12 is three, and the grouting hole groups are arranged in four groups equidistantly along the axial direction of the anchor rod 11. Each group has four grouting holes 13 equidistantly arranged along the circumference of the anchor rod 11. The number of water injection units 3 is set to four.

[0034] Connector 2 is used to connect the grouting machine and the spiral anchor 1 for water injection and grouting operations. It mainly includes the pipe 21 and the connecting pipe 24, such as... Figure 7 The top of the pipe sleeve 21 is sealed with a screw thread or integrally formed end seal 22, so the pipe sleeve 21 has only one open end at the bottom. A second flange 23 is welded to this open end. The pipe sleeve 21 is connected to the first flange 14 of the anchor rod 11 through the second flange 23. A sealing gasket is provided between the first flange 14 and the second flange 23, thereby achieving a detachable sealed connection between the open end of the pipe sleeve 21 and the top opening of the anchor rod 11, allowing the interior of the pipe sleeve 21 to communicate with the inner cavity of the anchor rod 11. The connecting pipe 24 is bent and passes through the side wall of the pipe sleeve 21. The connecting pipe 24 is fixedly connected to the pipe sleeve 21. The inner end of the connecting pipe 24 is located inside the pipe sleeve 21, and the outer end of the connecting pipe 24 is connected to the outlet of the grout delivery pipeline of the grouting machine.

[0035] Each water injection unit 3 is sequentially connected by a connecting rod 34 and is movably arranged inside the anchor bolt 11, such as... Figure 8 It can move along the axial direction of the anchor rod 11. Each water injection unit 3 corresponds one-to-one with each group of grouting holes. That is, one water injection unit 3 corresponds to one group of grouting holes. Each water injection unit 3 includes an inner cylinder 31 that is tightly fitted to the inner wall of the anchor rod 11. Multiple nozzles 32 are installed through the cylinder wall of the inner cylinder 31. Each nozzle 32 corresponds one-to-one with each grouting hole 13 of the corresponding grouting hole group. That is, one nozzle 32 corresponds to one grouting hole 13. The diameter of the nozzle 32 is smaller than the diameter of the grouting hole 13.

[0036] Each water injection unit 3 has a water injection station and a pressurization station during its axial movement along the anchor rod 11. When the water injection unit 3 is in the water injection station, its nozzles 32 are aligned with the corresponding grouting holes 13. Because the inner cylinder 31 is tightly fitted to the inner wall of the anchor rod 11, it can prevent water in the anchor rod 11 from flowing directly out of the grouting holes 13 without passing through the nozzles 32. The inner cylinder 31 specifically includes a rigid tube 311 and a rubber sleeve 312 covering the outer wall of the rigid tube 311. The nozzles 32 pass through both the rigid tube 311 and the rubber sleeve 312. The rigid tube 311 is made of alloy or hard plastic material, and the rubber sleeve 312 can effectively seal the grouting holes 13. After the water injection unit 3 leaves the water injection station, its nozzles 32 will no longer be aligned with the corresponding grouting holes 13.

[0037] The water injection unit 3, located at the water injection position, first sprays high-pressure water lines into the soil around the anchor rod 11 through the grouting hole 13, thereby flushing out a long waterway far away from the anchor rod 11. Then, the water injection unit 3 is adjusted to be removed from the water injection position. During subsequent grouting, cement grout is injected into the waterway through the grouting hole 13. The grouting pressure can also cause the cement grout in the waterway to penetrate into the surrounding area, thereby greatly increasing the range of cement grout diffusion around the anchor rod 11. This significantly improves the bearing capacity of the spiral anchor foundation, especially in silty sand, sandy soil and other geological formations.

[0038] Since the orifice diameter of nozzle 32 is much smaller than that of grouting hole 13, and although both water and cement slurry are low-viscosity fluids, the flow viscosity (resistance) of water is less than that of cement slurry, the grouting machine used for grouting can be used together when injecting water. Under the condition that the power of the grouting machine is the same, the pressure of the water line injected into the soil is much greater than the pressure of the cement slurry injected. Thus, a longer waterway can be flushed out without the need to provide a more powerful pump.

[0039] Furthermore, the inner cylinders 31 of each water injection unit 3 are connected by connecting rods 34. A pull rod 35 is axially and slidably connected to the pipe 21. The top of the pull rod 35 is located outside the pipe 21, and the bottom of the pull rod 35 is connected to the inner cylinder 31 of the uppermost water injection unit 3. The two ends of the inner cylinder 31 are respectively provided with slots 33, which are shaped with a larger inner opening and a smaller outer opening. The bottom of the pull rod 35 and the two ends of the connecting rod 34 are respectively provided with clamps that engage with the slots 33. The clamps are shaped with a larger head and a smaller neck, which facilitates the assembly and disassembly of the pull rod 35 and the inner cylinder 31, and the connecting rod 34 and the inner cylinder 31.

[0040] In the embodiment provided by this invention, the length of the connecting rod 34 between the second inner cylinder 31 and the third inner cylinder 31 is shorter than that of the other connecting rods 34. Therefore, when the two lower water injection units 3 are in the water injection position, the nozzles 32 of the two upper water injection units 3 are misaligned with the corresponding grouting holes 13, and the grouting holes 13 are completely closed by the inner cylinder 31. At this time, the two upper water injection units 3 are in the pressurization position. Of course, it can also be designed so that one or three water injection units 3 are in the water injection position, and the remaining water injection units 3 are in the pressurization position. In other words, some of the water injection units 3 are in the water injection position, and the other part of the water injection units 3 are in the pressurization position, such as... Figures 3-4 Therefore, during water injection, by adjusting the handle 38 and the lever 35 to alternately position each water injection unit 3 in the water injection position, the pressure of the water jet from the nozzle 32 of the water injection unit 3 currently in the water injection position can be further increased, thereby flushing out a longer water channel, and the cement slurry can spread more widely along the water channel during subsequent grouting.

[0041] In another embodiment of the present invention, the inner end of the connecting pipe 24 is connected to an inner pipe 25. The inner pipe 25 is fixedly connected to the anchor rod 11 through the connecting pipe 24, so that the inner pipe 25 is fixed relative to the anchor rod 11. The inner pipe 25 is located inside the anchor rod 11 and is arranged coaxially with the anchor rod 11. A cavity is formed between the outer wall of the inner pipe 25 and the inner wall of the anchor rod 11. During the axial movement of each water injection unit 3 along the anchor rod 11, it can also move into the cavity between the inner pipe 25 and the anchor rod 11. The position of the water injection unit 3 at this time is called the grouting position. When all water injection units 3 are in the grouting position, the lowest water injection unit 3 is sealed to the outer wall of the inner tube 25 through the sealing ring 4 at its bottom, thereby separating each water injection unit 3 from the middle and lower section of the inner cavity of the anchor rod 11. During the grouting operation, cement slurry is injected into the middle and lower section of the inner cavity of the anchor rod 11 through the inner tube 25. The cement slurry is directly poured into the water channel from each grouting hole 13. Under the obstruction of the sealing ring 4, the cement slurry cannot enter the clamping cavity above the sealing ring 4. The cement slurry will not come into contact with the water injection unit 3 and the tube 21, protecting the cleanliness of the water injection unit 3 and the tube 21, reducing the wear of the rubber sleeve 312, and especially preventing the nozzle 32 from being blocked.

[0042] More specifically, the top of the pull rod 35 is provided with a handle 38, a limiting part 36 is fixedly provided on the pull rod 35, and an exhaust groove 37 is provided on the side of the pull rod 35 through the limiting part 36. When all water injection units 3 are located in the grouting position, such as Figures 5-6 The limiting part 36 abuts against the top of the tube 21, thus indicating that all water injection units 3 have entered the clamping cavity and moved into position. At this time, the venting groove 37 penetrates the top of the tube 21, connecting the inside and outside of the tube 21 and releasing the pressure inside the clamping cavity and the tube 21. This pressure mainly comes from the compression of the space inside the clamping cavity when the sealing ring 4 is fitted onto the inner tube 25 after each grouting unit enters the clamping cavity. The sealing ring 4 is installed to the bottom of the inner tube 25 through two bolt pairs. The nuts of the bolt pairs are locked in the slots 33, and the bolts pass through the through holes on the sealing ring 4 and are screwed into the nuts. The specific structure of the sealing ring 4 includes a hard ring 41 and a rubber ring 42 embedded in the inner wall of the hard ring 41. The hard ring 41 is made of alloy or hard plastic material, and the rubber ring 42 can improve the sealing effect between it and the inner tube 25.

[0043] This invention also provides a construction method for a water-injected grouting spiral anchor foundation, mainly including the following steps: connecting the top of the anchor rod 11 to the spiral anchor 1 drilling rig, so that the spiral anchor 1 is screwed into the ground to a predetermined depth, and then removing the spiral anchor 1 drilling rig from the anchor rod 11; installing the connector 2 equipped with multiple water injection units 3 onto the anchor rod 11, inserting each water injection unit 3 into the inner cavity of the anchor rod 11, and sealing the open end of the pipe 21 with the top opening of the anchor rod 11, tightening the bolt pair between the first flange 14 and the second flange 23, and then connecting the outer end of the connecting pipe 24 to the output pipe of the grouting machine; adjusting the water injection unit 3 to the water injection position through the tie rod 35 (so that each water injection unit 3 can be alternately in the water injection position), connecting the input pipe of the grouting machine to a water source, and pumping water into the anchor rod 11 through the connecting pipe 24, and the water line ejected from the nozzle 32 passes through the grouting hole 13 to flush out the soil around the anchor rod 11 and extend it to a distance. The water channel is extended, and then the water injection is stopped and waited for 20-30 minutes to allow the water in the anchor rod 11 and the water channel to seep into the soil. The water injection unit 3 is moved to the grouting position in the cavity by lifting the upper pull rod 35, exposing each grouting hole 13. The input pipe of the grouting machine is connected to cement grout. The grouting machine pumps PO42.5 cement grout (water-cement ratio of 0.5) into the middle and lower section of the inner cavity of the anchor rod 11 through the connecting pipe 24 and the inner pipe 25. The cement grout is injected into the water channel through the grouting hole 13. When the cement grout breaks through the water channel and seeps into the surrounding water channel until the cement grout rises to the ground or the grouting volume reaches the design value, the grouting is terminated. The connector 2 is removed and each water injection unit 3 is taken out. The input pipe of the grouting machine is reconnected to the water source and the pump of the grouting machine is started. The input pipe, pump, output pipe, connecting pipe 24 and inner pipe 25 are thoroughly flushed, and the sealing ring 4 and the bottom of the inner pipe 25 are also flushed. The construction is completed after the spiral anchor foundation is cured for 24 hours.

[0044] The foregoing description of certain exemplary embodiments of the present invention should not be construed as limiting the scope of protection of the claims. Those skilled in the art will recognize that the described embodiments can be modified in other ways without departing from the spirit and scope of the invention.

Claims

1. A water-injected grouting type spiral anchor foundation, comprising a hollow anchor rod and at least one anchor plate disposed in the lower section of the anchor rod, and multiple sets of grouting holes, characterized in that, Also includes: The connector includes a tube and a connecting pipe. The tube has only one open end that is detachably and sealed to the top of the anchor rod. The connecting pipe passes through the side wall of the connecting tube, with its inner end located inside the tube and its outer end used to connect to the grouting machine. Multiple water injection units are connected in sequence and are movably arranged inside the anchor bolt and correspond one-to-one with each group of grouting holes. Each water injection unit includes an inner cylinder that is tightly fitted to the inner wall of the anchor bolt. Multiple nozzles are installed through the cylinder wall of the inner cylinder. Each nozzle corresponds one-to-one with each grouting hole in the corresponding grouting hole group. During the process of moving along the axial direction of the anchor bolt, each water injection unit has a water injection station that aligns each nozzle with the corresponding grouting hole. The inner cylinders of each water injection unit are connected by a connecting rod, and a tie rod is slidably connected to the tube along the axial direction. The bottom of the tie rod is connected to the uppermost water injection unit. During the process of each water injection unit moving along the anchor bolt axial direction, there is also a pressurization station that closes the corresponding grouting hole group in the inner cylinder. When any part of the water injection unit is in the water injection station, the other part of the water injection unit is in the pressurization station. The inner end of the connecting pipe is connected to an inner pipe, which is coaxial with the anchor rod and extends into the anchor rod. A cavity is formed between the outer wall of the inner pipe and the inner wall of the anchor rod. During the process of each water injection unit moving along the anchor rod axial direction, there is also a grouting station located in the clamping cavity. When each water injection unit is located in the grouting station, the water injection unit located at the bottom is sealed and fitted with the outer wall of the inner tube through the sealing ring at its bottom.

2. The water-injected grouting spiral anchor foundation according to claim 1, characterized in that, The anchor rod is provided with a first flange at its top, and the open end of the pipe is provided with a second flange that connects and mates with the first flange.

3. The water-injected grouting spiral anchor foundation according to claim 1, characterized in that, The inner cylinder of the water injection unit includes a rigid pipe and a rubber sleeve covering the outer wall of the rigid pipe, and the nozzle penetrates both the rigid pipe and the rubber sleeve.

4. The water-injected grouting spiral anchor foundation according to claim 1, characterized in that, The inner cylinder has slots at both ends, and the bottom of the pull rod and the two ends of the connecting rod have clips that engage with the slots.

5. The water-injected grouting spiral anchor foundation according to claim 1, characterized in that, A limiting part is fixedly provided on the pull rod, and an exhaust groove is provided on the side of the pull rod that penetrates the limiting part. When each water injection unit is located at the grouting position, the limiting part abuts against the top of the pipe, and the exhaust groove penetrates the top of the pipe to connect the inside and outside of the pipe.

6. The water-injected grouting spiral anchor foundation according to claim 1, characterized in that, The sealing ring includes a rigid ring and a rubber ring embedded in the inner wall of the rigid ring.

7. A construction method, based on the water-injected grouting spiral anchor foundation as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Connect the top of the anchor bolt to the auger, screw the anchor bolt into the ground to the predetermined depth, and then remove the auger from the anchor bolt. S2. Install the connector with multiple water injection units onto the anchor rod, insert each water injection unit into the inside of the anchor rod, and seal the open end of the pipe to the top of the anchor rod. Connect the outer end of the connecting pipe to the output pipe of the grouting machine. S3. Adjust the water injection unit to the water injection position. The grouting machine pumps water into the anchor rod through the connecting pipe. The water line shot out by the nozzle passes through the grouting hole and washes the soil around the anchor rod to create a waterway that extends far away. S4. Adjust the water injection unit to be disconnected from the water injection station and expose each grouting hole. The grouting machine pumps cement slurry into the anchor rod through the connecting pipe. The cement slurry is injected into the water channel through the grouting hole. When the cement slurry breaks through the water channel and surges to the ground, stop the grouting, remove the connector and take out each water injection unit. S5. Construction is completed after 24 hours of curing.

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