Cement-soil pressurized pile planting equipment and process

Abstract

The application relates to the technical field of building construction, in particular to a cement soil pressure-grouting pile planting equipment, which comprises a drilling mechanism and a screening mechanism. The drilling mechanism comprises a sliding frame, a spiral drill rod driven to rotate by a motor is slidably arranged on the sliding frame, the spiral drill rod can move along the vertical direction of the sliding frame, a vibrating seat is also slidably arranged on the sliding frame, the vibrating seat can move along the vertical direction of the sliding frame, a casing is fixedly arranged on the vibrating seat, a vibrating hammer for vibrating the casing is arranged on the vibrating seat, the axis of the casing is arranged in correspondence with the axis of the spiral drill rod, the casing is arranged on the outer side of the spiral drill rod, the spiral drill rod penetrates through the vibrating seat and extends into the casing, and a soil bucket is further arranged on the vibrating seat and surrounds the spiral drill rod and is used for receiving the drilled soil, sand and stone. The screening mechanism comprises a screen and a reuse tank, the screen is used for screening the soil, sand and stone and feeding into the reuse tank, and the reuse tank is used for storing the reused soil, sand and stone. The soil can be reused.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a cement-soil pressure grouting pile planting equipment and process. Background Technology

[0002] Cement-soil pressure grouting piles are a composite pile foundation technology that combines cement-soil mixing with pressure grouting. They are mainly used for soft soil foundation treatment and foundation pit support engineering. The core principle is to form cement-soil piles through high-pressure grouting, and then insert precast piles or steel cages into them to form a composite structure that combines soil retention, water isolation, and load-bearing functions.

[0003] Under current technology, this type of construction usually involves drilling first, during which soil is continuously excavated. A large amount of sand and soil is excavated during this process. Common disposal methods are either discarding it or using it to fill the pit. Discarding it wastes resources, while using it to fill the pit wastes the resources that were excavated. Both methods result in resource waste. Summary of the Invention

[0004] To address the issue that existing construction methods typically involve drilling, which continuously removes soil and generates a large amount of sand and mud, the common solutions are to discard the soil or use it for filling pits. Discarding the soil wastes resources, while using it for filling pits wastes the resources that were excavated. This application provides a cement-soil pressure grouting pile planting device.

[0005] A cement-soil pressure grouting pile planting device includes a drilling mechanism and a screening mechanism. The drilling mechanism includes a sliding frame, on which a spiral drill rod driven by a motor is slidably mounted. The spiral drill rod can move along the vertical direction of the sliding frame. A vibrating seat is also slidably mounted on the sliding frame, and the vibrating seat can move along the vertical direction of the sliding frame. A protective casing is fixedly mounted on the vibrating seat, and a vibrating hammer for vibrating the protective casing is mounted on the vibrating seat. The axis of the protective casing corresponds to the axis of the spiral drill rod. The protective casing is located outside the spiral drill rod. The spiral drill rod passes through the vibrating seat and extends into the protective casing. A soil-collecting bucket is also mounted on the vibrating seat, which surrounds the spiral drill rod and is used to collect the drilled soil and gravel. The screening mechanism includes a screener and a reuse tank. The screener is used to screen soil and sand and pass them into the reuse tank, and the reuse tank is used to store soil and sand for reuse.

[0006] By adopting the above technical solutions, the drilling mechanism can perform drilling and soil extraction operations. The auger drill rod can move vertically along the sliding frame for drilling, the vibratory hammer can drive the casing to advance synchronously, and the soil extraction bucket can collect the drilled soil and gravel. The screening mechanism can screen the soil and gravel, storing the screened soil and gravel in a reuse tank for reuse. This reduces soil waste during the pit filling process and reduces resource waste.

[0007] Optionally, it also includes a tracked crane, on which a free-falling hammer is mounted, and the tracked crane is capable of moving in a vertical direction.

[0008] By adopting the above technical solutions, a crawler crane and a free-fall hammer are added to the cement-soil pressure grouting pile planting equipment. The crawler crane can move in the vertical direction, and the impact force of the free-fall hammer can be used to assist in completing the pile planting operation, thereby enhancing the pile planting effect.

[0009] Optionally, the spiral drill rod has a grouting channel inside, the grouting channel is arranged along the axis of the spiral drill rod and passes through the spiral drill rod, and a feed pipe is provided at the top of the grouting channel for injecting mud, the feed pipe being connected to the grouting channel.

[0010] By adopting the above technical solution, a grouting channel and a feed pipe are set inside the auger drill rod. The slurry can enter the grouting channel from the feed pipe and then be discharged from the bottom of the auger drill rod, realizing the function of injecting slurry into the borehole. The auger drill rod moves upward to complete the pile grouting.

[0011] Optionally, the sieve is equipped with a vibrating screen for vibrating and screening the soil, and the reuse tank is equipped with a stirring paddle for introducing slurry, which is used to stir the screened soil and slurry.

[0012] By adopting the above technical solutions, the vibrating screen can vibrate and screen the soil, and the stirring slurry can mix the screened soil and slurry, which helps to achieve coarse and fine screening of soil and gravel and to make the fine soil and gravel into reusable slurry.

[0013] Optionally, the vibrating seat is provided with a soil sampling groove, which is set corresponding to the spiral drill rod. A primary screen is set at the soil sampling groove, which is set corresponding to the position of the soil sampling hopper. The primary screen is used for preliminary screening of the soil.

[0014] By adopting the above technical solutions, when the auger rod of the drilling mechanism drills the soil, the soil hopper receives the soil and gravel, and the primary screen on the vibrating seat corresponding to the position of the soil hopper can perform preliminary screening of the soil, which reduces the burden on the subsequent screening mechanism and improves screening efficiency and quality.

[0015] Optionally, the primary screening screen includes two screen plates, which are detachably connected. The screen plates are respectively disposed on both sides of the auger rod. The vibrating seat is provided with an exit groove corresponding to the screen plate. The exit groove is disposed on both sides of the vibrating seat and passes through the vibrating seat. The screen plate can be fed into the vibrating seat along the exit groove. The vibrating seat is provided with a sliding groove corresponding to the screen plate. The screen plate can slide up and down along the sliding groove. The screen plate is provided with a helical groove corresponding to the auger rod. After the two screen plates are connected, they can be connected to the auger rod through the helical groove. When the auger rod rotates, the two screen plates can be driven to move upward by the auger rod. The auger rod is provided with a reverse helical section on the upper side of the screen plate. The reverse helical section is opposite to the helix of the auger rod. After the reverse helical section extends into the helical groove, it drives the screen plate to move downward.

[0016] By adopting the above technical solution, the primary screening screen is set as two detachably connected screen plates, which facilitates the installation and disassembly of the screen plates. The screen plates can be fed into the vibrating seat along the exit groove and slide up and down along the sliding groove. They can also wrap around the spiral drill rod through the spiral groove. When the spiral drill rod rotates, the screen plates are driven up and down by its blades. When the soil is continuously fed into the soil sampling groove of the vibrating seat, the screen plates will circulate up and down, thereby screening the soil, thus assisting in the screening of the soil, improving the screening efficiency, and making the subsequent screening mechanism work more smoothly.

[0017] Optionally, both mesh plates are provided with magnetic strips, and both magnetic strips are positioned close to the other mesh plate, and the magnetic strips can attract each other.

[0018] By adopting the above technical solution, the magnetic strip can make the two screens more tightly connected, thereby improving the stability during screening. Furthermore, since there is spiral interference from the spiral drill rods on both the upper and lower sides of the screen, even if the adsorption loosens, it will be blocked by the spiral, making it difficult for the screen to fall off.

[0019] Optionally, the mesh plate is provided with a wear-reducing plate at the position of the spiral groove, the wear-reducing plate is arranged around the spiral groove, and the wear-reducing plate is used to abut against the spiral drill rod.

[0020] By adopting the above technical solutions, the friction-reducing pads can reduce friction, which can reduce the situation where fine sand gets stuck between the auger rod and the mesh plate and is difficult to remove, thus affecting rotation. It can also reduce the wear caused by the contact between the auger rod and the mesh plate, thereby improving service life.

[0021] This application also provides a cement-soil pressure grouting pile planting process: including the above-mentioned cement-soil pressure grouting pile planting equipment, and employing the following method: A. The drilling mechanism first drills the auger into the ground, and at the same time, the casing is advanced to the design elevation by the vibratory hammer. B. The auger stops moving vertically and continues to rotate to extract soil until the soil at the elevation is completely removed. At this point, the soil is preliminarily screened by the primary sieve. C. The soil is sent out along the soil hopper and transported to the screening mechanism. The screening mechanism separates the soil and gravel into coarse and fine sections. The fine soil and gravel are sent into the reuse tank and stirred into slurry. D. The mud is introduced into the auger drill pipe through the grouting channel. The mud is discharged from the bottom of the auger drill pipe, and the auger drill pipe is moved upward at the same time. E. After the auger drill rod is completely removed, the outer casing is driven into place by free fall. The outer casing is located between the casing and the pile body. F. After the pile body and outer cylinder are formed, the free-fall hammer is hoisted out, and the casing is vibrated by the vibratory hammer while the casing is moved upward and removed to complete the pile planting.

[0022] By adopting the above technical solutions, the extracted soil can be reused. Reusing the extracted soil can effectively reduce resource waste and reduce the waste of electricity and equipment resources caused by the ineffective work of digging up the soil and then re-filling it.

[0023] In summary, this application has at least the following beneficial effects: This application addresses the problem that in existing construction methods, drilling is typically performed first, during which soil is continuously excavated, resulting in a large amount of sand and mud. Common disposal methods include discarding the soil or using it for filling pits. Discarding the soil wastes resources, while using it for filling pits wastes the excavated resources. This application reduces resource waste and improves resource utilization by reusing the soil extracted from the drilling process for subsequent mud filling steps. Attached Figure Description

[0024] Figure 1 This is a perspective view of this embodiment.

[0025] Figure 2 This is a perspective view of this embodiment.

[0026] Figure 3 This is a cross-sectional view of the screening mechanism in this embodiment.

[0027] Figure 4 This is a cross-sectional view of the drilling mechanism in this embodiment.

[0028] Explanation of reference numerals in the attached figures: 1. Drilling mechanism; 11. Sliding frame; 12. Spiral drill rod; 121. Grouting channel; 122. Feed pipe; 13. Vibrating seat; 131. Soil hopper; 132. Soil trough; 133. Primary screen; 134. Screen plate; 135. Exit trough; 136. Sliding trough; 137. Spiral trough; 138. Magnetic strip; 139. Abrasion reducing plate; 14. Casing; 15. Vibrating hammer; 2. Screening mechanism; 21. Screener; 211. Vibrating screen; 22. Reuse tank; 221. Agitator; 3. Tracked crane; 31. Free-fall hammer; Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] A cement-soil pressure grouting pile planting device, such as Figure 1 and Figure 2 As shown, the system includes a drilling mechanism 1 and a screening mechanism 2. The drilling mechanism includes a sliding frame 11, on which a spiral drill rod 12 driven by a motor is slidably mounted. The spiral drill rod 12 can move along the vertical direction of the sliding frame 11. A vibrating seat 13 is also slidably mounted on the sliding frame 11. The vibrating seat 13 can move along the vertical direction of the sliding frame 11. A protective casing 14 is fixedly mounted on the vibrating seat 13. A vibrating hammer 15 for vibrating the protective casing 14 is mounted on the vibrating seat 13. The axis of the protective casing 14 corresponds to the axis of the spiral drill rod 12. The protective casing 14 is located outside the spiral drill rod 12. The spiral drill rod 12 passes through the vibrating seat 13 and extends into the protective casing 14. A soil-collecting bucket 131 is also mounted on the vibrating seat 13. The soil-collecting bucket 131 is arranged around the spiral drill rod 12 and is used to collect the drilled soil and sand. In practice, the vibratory seat 13 and the spiral drill rod 12 slide vertically via an electric hoist or linear mechanism. During drilling, the spiral drill rod 12 and the casing 14 move downwards synchronously. During drilling, the continuous downward movement does not remove most of the soil. When the distance is reached, the drill rod remains in position and continues to rotate due to the restriction of the casing 14. Under the action of spiral rotation, the soil is blocked by the casing 14. Therefore, the soil can only be spiraled upwards along the casing 14 and then sent out. At this time, the soil can be removed. The vibratory hammer 15 uses the same principle as the vibratory motor. It generates vibration through repeated movement, which causes the vibratory seat 13 to vibrate.

[0031] like Figure 1 and Figure 3As shown, the screening mechanism 2 includes a screener 21 and a reuse tank 22. The screener 21 is used to screen soil and sand and pass them into the reuse tank 22, which is used to store soil and sand for reuse. A vibrating screen 211 is installed inside the screener 21 for vibrating and screening the soil. A stirring paddle is installed inside the reuse tank 22 for introducing slurry, and the stirring paddle is used to mix the screened soil and slurry. In practice, the screening uses a common vibrating screener. Large soil particles cannot pass through the vibrating screen 211, making it difficult to make slurry from such soil. Small soil particles, however, can pass through the vibrating screen 211, making it easier to make slurry. The removed soil needs to be fed into the screener 21 by a loader or similar means. The screened soil is then conveyed into the reuse tank 22 via a conveyor belt. In the reuse tank 22, raw materials for making slurry are mixed in to form slurry for reuse. In other embodiments, screening can also be performed in other ways, and the soil hopper 131 can be directly aligned with the screener 21 to further improve convenience.

[0032] like Figure 1 and Figure 4 As shown, it also includes a crawler crane 3, on which a free-fall hammer 31 is mounted. The crawler crane 3 can move in the vertical direction. In specific implementation, the free-fall hammer 31 is used to strike the outer cylinder that is fitted on the outside of the pile body. The striking can be achieved by gravity free fall, without the need to apply additional force, thus reducing construction costs.

[0033] like Figure 4 As shown, the auger drill rod 12 has a grouting channel 121 inside, which is arranged along the axis of the auger drill rod 12 and passes through the auger drill rod 12. A feed pipe 122 is provided at the top of the grouting channel 121 for injecting slurry, and the feed pipe 122 is connected to the grouting channel 121. In specific implementation, the auger drill rod 12 stops rotating during grouting, and the feed pipe 122 needs to be inserted to introduce slurry. The slurry rises continuously from the bottom, and the slurry and the auger drill rod 12 should move upwards together at the same speed to avoid the slurry covering the auger drill rod 12 and causing it to stick to the auger.

[0034] like Figure 4As shown, a soil sampling groove 132 is provided on the vibrating seat 13, which is set corresponding to the spiral drill rod 12. A primary screen 133 is provided at the soil sampling groove 132, which is set corresponding to the position of the soil sampling hopper 131. The primary screen 133 is used for preliminary screening of soil. The primary screen 133 includes two screen plates 134, which are detachably connected. The screen plates 134 are respectively set on both sides of the spiral drill rod 12. The vibrating seat 13 is provided with an exit groove 135 corresponding to the screen plates 134. The exit groove 135 is set on both sides of the vibrating seat 13 and passes through the vibrating seat 13. The screen plates 134 can be fed into the vibrating seat 13 along the exit groove 135. A sliding groove 136 is provided in the vibrating seat 13 corresponding to the screen plates 134, and the screen plates 134 can slide up and down along the sliding groove 136. In specific implementation, the exit groove 135 is set at the top of the soil extraction groove 132. The mesh plate 134 can only be removed from the exit groove 135 when it slides to the top of the sliding groove 136. The mesh plate 134 can be installed into the soil extraction groove 132 from both sides, or it can be removed from the soil extraction groove 132 after it is filled, which is convenient for processing excess soil. In other embodiments, the mesh plate 134 can be replaced with an electric drive to further improve convenience.

[0035] like Figure 4 As shown, the mesh plate 134 has a spiral groove 137 corresponding to the spiral drill rod 12. After the two mesh plates 134 are connected, they can be connected to the spiral drill rod 12 through the spiral groove 137. When the spiral drill rod 12 rotates, the two mesh plates 134 can be driven by the spiral drill rod 12 to move upward. The spiral drill rod 12 has a reverse spiral section on the upper side of the mesh plate 134. The reverse spiral section is opposite to the spiral of the spiral drill rod 12. After the reverse spiral section extends into the spiral groove 137, it drives the mesh plate 134 to move downward. In practice, the primary screen 133, in conjunction with the spiral groove 137 and the spiral drill rod 12, moves upward first, and then downward when it reaches the reverse spiral section. As soil is continuously fed into the soil extraction trough 132, it continues to move upward until it reaches the primary screen 133. At this point, the primary screen 133 moves up and down. Because the soil is continuously pushed upward, fine particles of soil can continue to move upward through the primary screen 133 and be delivered into the soil extraction hopper 131. The top of the primary screen 133 is slightly angled towards the soil extraction hopper 131. The 31 is inclined at an angle, so the soil can be continuously fed into the soil hopper 131 under the guide to avoid blockage. Coarse soil particles cannot pass through the primary screen 133 and are left in the soil trough 132. In order to further reduce blockage, the soil particles screened by the primary screen 133 are not too small, so only a small amount of excessively large soil particles cannot pass through. In addition, the vibrating hammer 15 at the vibrating seat 13 can also be activated to assist in screening. When vibrating, it can effectively shake the soil stuck on the primary screen 133 off to avoid blockage.

[0036] like Figure 4As shown, each of the two mesh plates 134 is provided with a magnetic strip 138, which is positioned close to the other mesh plate 134. The magnetic strips 138 can attract each other. In practice, the magnetic strips 138 can help connect the two mesh plates 134, but in reality, the two mesh plates 134 are blocked by the spiral of the auger rod 12, so the mesh plates 134 are difficult to detach from the auger rod 12.

[0037] like Figure 4 As shown, the mesh plate 134 is provided with a friction-reducing plate 139 at the position of the spiral groove 137. The friction-reducing plate 139 is arranged around the spiral groove 137 and is used to abut against the spiral drill rod 12. In specific implementation, the friction-reducing plate 139 is made of low-friction and high-durability materials such as polytetrafluoroethylene, which can effectively reduce the situation where soil is stuck in the spiral groove 137, and reduce the situation where the spiral drill rod 12 is stuck and cannot rotate. Coarse sand particles have difficulty entering this position, and fine particles can slide out quickly under the action of the friction-reducing plate 139 after entering this position. Furthermore, the soil can also be squeezed out through the reverse spiral section, which further improves the stability of use.

[0038] This embodiment also provides a cement-soil pressure grouting pile planting process: including the cement-soil pressure grouting pile planting equipment described in the claims above, and employing the following method: A. The drilling mechanism 1 first drills the spiral drill rod 12 into the ground, and at the same time, the casing 14 is synchronously advanced to the design elevation through the vibratory hammer 15. At this time, only part of the soil is upward, which will support part of the soil at the ground. B. The spiral borehole stops moving vertically and continues to rotate to extract soil until the soil at the elevation is completely removed. At this point, the soil is preliminarily screened by the primary screen 133. C. The soil is sent out along the soil hopper 131 and transported to the screening mechanism 2. The screening mechanism 2 separates the soil and gravel into coarse and fine sections. The fine soil and gravel are sent into the reuse tank 22 and stirred into mud. Equipment such as a loader is required for transport. D. The mud made from reclaimed soil is directly introduced into the spiral drill rod 12 through the grouting channel 121. The mud is discharged from the bottom of the spiral drill rod 12, and the spiral drill rod 12 is moved upward at the same time. E. After the spiral drill rod 12 is completely removed, the outer cylinder is driven into the pile body by free fall. The outer cylinder is located between the casing 14 and the pile body. F. After the pile body and outer cylinder are formed, the free-fall hammer 31 is lifted out, and the casing 14 is vibrated by the vibratory hammer 15. At the same time, the casing 14 is moved upward and removed to complete the pile planting.

[0039] Working principle: By reusing the soil extracted from the ground as drilling mud and using it directly in the construction process, the utilization rate of resources is improved.

[0040] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cement-soil pressure grouting pile planting device, characterized in that: The system includes a drilling mechanism (1) and a screening mechanism (2). The drilling mechanism includes a sliding frame (11), on which a spiral drill rod (12) driven by a motor is slidably mounted. The spiral drill rod (12) can move along the vertical direction of the sliding frame (11). A vibrating seat (13) is also slidably mounted on the sliding frame (11), and the vibrating seat (13) can move along the vertical direction of the sliding frame (11). A protective sleeve (14) is fixedly mounted on the vibrating seat (13). The vibrating seat (13) is provided with a vibrating hammer (15) for vibrating the casing (14). The axis of the casing (14) is set to correspond to the axis of the spiral drill rod (12). The casing (14) is set on the outside of the spiral drill rod (12). The spiral drill rod (12) passes through the vibrating seat (13) and extends into the casing (14). The vibrating seat (13) is also provided with a soil-collecting bucket (131). The soil-collecting bucket (131) is set around the spiral drill rod (12) and is used to collect the drilled soil and sand. The screening mechanism (2) includes a screener (21) and a reuse tank (22). The screener (21) is used to screen soil and gravel and pass them into the reuse tank (22). The reuse tank (22) is used to store soil and gravel for reuse. The sieve (21) is equipped with a vibrating screen (211), which is used to vibrate and screen the soil. The reuse tank (22) is equipped with a stirring paddle, which is used to pass mud into the reuse tank (22). The stirring paddle is used to stir the screened soil and mud. The vibrating seat (13) is provided with a soil sampling groove (132), which is set to correspond to the spiral drill rod (12). A primary screen (133) is set at the soil sampling groove (132), which is set to correspond to the position of the soil sampling hopper (131). The primary screen (133) is used for preliminary screening of soil. The primary screening screen (133) includes two screen plates (134), which are detachably connected. The screen plates (134) are respectively disposed on both sides of the spiral drill rod (12). The vibrating seat (13) is provided with an exit groove (135) corresponding to the screen plates (134). The exit groove (135) is disposed on both sides of the vibrating seat (13) and passes through the vibrating seat (13). The screen plates (134) can be fed into the vibrating seat (13) along the exit groove (135). The vibrating seat (13) is provided with a sliding groove (136) corresponding to the screen plates (134). It can slide up and down along the sliding groove (136). The mesh plate (134) has a spiral groove (137) corresponding to the spiral drill rod (12). After the two mesh plates (134) are connected, they can be connected to the spiral drill rod (12) through the spiral groove (137). When the spiral drill rod (12) rotates, the two mesh plates (134) can be driven by the spiral drill rod (12) to move upward. The spiral drill rod (12) has a reverse spiral section on the upper side of the mesh plate (134). The reverse spiral section is opposite to the spiral of the spiral drill rod (12). After the reverse spiral section extends into the spiral groove (137), it drives the mesh plate (134) to move downward.

2. The cement-soil pressure grouting pile planting equipment according to claim 1, characterized in that: It also includes a tracked crane (3), on which a free-falling hammer (31) is mounted, and the tracked crane (3) is capable of moving in the vertical direction.

3. The cement-soil pressure grouting pile planting equipment according to claim 1, characterized in that: The spiral drill rod (12) has a grouting channel (121) inside. The grouting channel (121) is arranged along the axis of the spiral drill rod (12) and passes through the spiral drill rod (12). A feed pipe (122) is provided at the top of the grouting channel (121). The feed pipe (122) is used to inject mud. The feed pipe (122) is connected to the grouting channel (121).

4. The cement-soil pressure grouting pile planting equipment according to claim 1, characterized in that: Both of the mesh plates (134) are provided with magnetic strips (138), and both magnetic strips (138) are located close to the other mesh plate (134). The magnetic strips (138) can attract each other.

5. The cement-soil pressure grouting pile planting equipment according to claim 4, characterized in that: The mesh plate (134) is provided with a wear-reducing plate (139) at the position of the spiral groove (137). The wear-reducing plate (139) is arranged around the spiral groove (137) and is used to abut against the spiral drill rod (12).

6. A cement-soil pressure grouting pile planting process: comprising the cement-soil pressure grouting pile planting equipment as described in any one of claims 1-5, and employing the following method: A. The drilling mechanism (1) first drills the spiral drill rod (12) into the ground, and at the same time, the casing (14) is synchronously advanced to the design elevation by the vibratory hammer (15) along with the spiral drill rod (12); B. The spiral borehole stops moving vertically and continues to rotate to extract soil until the soil at the elevation is completely removed. At this time, the soil is preliminarily screened by the primary screen (133). C. The soil is sent out along the soil hopper (131) and transported to the screening mechanism (2). The screening mechanism (2) screens the soil and gravel according to their coarseness and fineness. The fine soil and gravel are sent into the reuse tank (22) and stirred into mud. D. The mud is introduced into the auger rod (12) through the grouting channel (121), and the mud is discharged from the bottom of the auger rod (12) while the auger rod (12) is moved upward. E. After the auger rod (12) is completely removed, the outer cylinder is driven into place by free fall. The outer cylinder is located between the casing (14) and the pile body. F. After the pile body and outer cylinder are formed, the free-fall hammer (31) is lifted out, and the casing (14) is vibrated by the vibratory hammer (15) and the casing (14) is moved up and taken out to complete the pile planting.

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