Device and method for reusing soil matrix in pile foundation construction in confined space

Abstract

The present invention discloses a device for reusing soil matrix in pile foundation construction in a confined space, which includes a rotary drilling bucket detachably connected to one end of a drill pipe. A plurality of rotary drilling teeth are provided at the end of the rotary drilling bucket away from the drill pipe, and the rotary drilling teeth are evenly arranged along the circumferential direction of the rotary drilling bucket. A compaction mechanism for compacting the rotary drilled soil into the borehole wall is arranged inside the rotary drilling bucket. The present invention compacts the borehole wall firmly and improves the compactness of the soil in the area within the circumferential range of the borehole, avoiding the occurrence of borehole collapse and providing a stable foundation for the subsequent installation of the steel reinforcement cage and the pouring of concrete. The present invention is applicable to the technical field of drilling with a drilling rig in pile foundation construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of pile foundation construction. Specifically, it relates to a device and method for reusing soil matrix in pile foundation construction in a confined space. Background Art

[0002] Currently, in the construction of drilling holes in a predetermined area using a drilling rig, due to factors such as the water content and looseness of the soil, the hole wall of the drilled hole cannot form a firm mud skin, or cannot adjust the mud specific gravity according to the change of geological conditions, resulting in unstable hole walls. This often causes the phenomenon of hole collapse during the drilling process of the drilling rig, making the drilling operation unable to proceed normally, and extremely likely to cause accidents such as drill dropping and drill burying. Moreover, due to the occurrence of the hole collapse phenomenon, it is impossible to ensure the smooth release of the subsequent steel reinforcement cage, and thus the pile foundation formed by the subsequent concrete pouring operation cannot meet the expectations. Summary of the Invention

[0003] The present invention provides a device and method for reusing soil matrix in pile foundation construction in a confined space, which is used to compact the hole wall of the drilled hole firmly and improve the compactness of the soil in the area within the circumferential range of the drilled hole, avoid the occurrence of hole collapse phenomenon, and provide a stable foundation for the subsequent installation of the steel reinforcement cage and the pouring of concrete.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A device for reusing soil matrix in pile foundation construction in a confined space includes a rotary bucket detachably connected to one end of a drill pipe. A plurality of rotary teeth are provided at the end of the rotary bucket far from the drill pipe, and the rotary teeth are evenly arranged along the circumferential direction of the rotary bucket. A compaction mechanism is arranged in the rotary bucket for compacting the excavated soil into the hole wall of the drilled hole.

[0006] Further, the compaction mechanism includes a material guiding and compaction cylinder coaxially assembled in the rotary bucket. A feeding cavity is formed in the material guiding and compaction cylinder, and a discharging and compaction cavity is formed between the material guiding and compaction cylinder and the rotary bucket. A material guiding port communicating the feeding cavity and the discharging and compaction cavity is opened at the upper part of the material guiding and compaction cylinder. A plurality of compaction holes are opened along the circumferential direction at the lower position of the rotary bucket. On the inner wall and outer wall of the material guiding and compaction cylinder, a feeding spiral blade and a discharging spiral blade extending along its axis are respectively constructed. The feeding spiral blade is used to convey the soil from the lower part of the rotary bucket to the material guiding port, and the discharging spiral blade is used to convey the soil in the upper part of the discharging and compaction cavity to the compaction holes.

[0007] Further, the radial length of the material guiding and compaction cylinder decreases upward along its axis.

[0008] Further, the pitch of the feeding spiral blade is greater than the pitch of the discharging spiral blade.

[0009] Further, a plurality of blanking ports are formed at the upper end of the rotary drilling cylinder, and each of the blanking ports is communicated with the blanking and compaction cavity.

[0010] Further, the material guiding and compaction cylinder is rotatably connected to the rotary drilling cylinder, and a driving mechanism is connected to the upper end of the material guiding and compaction cylinder. The driving mechanism drives the material guiding and compaction cylinder to rotate along the axis of the rotary drilling cylinder.

[0011] Further, the driving mechanism includes a hydraulic motor assembled in the assembly groove at the lower end of the drill pipe. The output shaft of the hydraulic motor is detachably connected to the upper end of the material guiding and compaction cylinder. A hydraulic oil inlet channel and a hydraulic oil return channel are constructed in the drill pipe. The inlet end and the outlet end of the hydraulic motor are respectively communicated with the hydraulic oil inlet channel and the hydraulic oil return channel. And a hydraulic oil adapter is rotatably connected to the drill pipe. The hydraulic oil adapter is respectively communicated with the hydraulic oil inlet channel and the hydraulic oil return channel.

[0012] Further, a suction pipe extending along its axis is arranged in the material guiding and compaction cylinder. The suction pipe is communicated with the outside through a silt discharge channel constructed in the drill pipe.

[0013] Further, a connecting rod connected to the output shaft of the hydraulic motor is constructed at the upper end of the material guiding and compaction cylinder. The connecting rod has a suction channel communicated with the suction pipe. A first silt discharge adapter is rotatably connected to the connecting rod. The first silt discharge adapter is fixedly connected to a connecting sleeve constructed at the upper end of the rotary drilling cylinder. A plurality of through holes are formed in the connecting rod at the position of the first silt discharge adapter. The two ends of a connecting pipe are communicated with the first silt discharge adapter and the silt discharge channel. A second silt discharge adapter is rotatably installed at the outlet end of the silt discharge channel on the drill pipe.

[0014] The present invention also discloses a construction method of a soil matrix recycling device in pile foundation construction in a limited space, including the following steps:

[0015] S1. Connect the rotary drilling cylinder with the extrusion mechanism to the drill pipe of the drilling rig;

[0016] S2. Drive the power head of the drilling rig to drive the drill pipe to rotate and gradually displace downward, and the rotary drilling cylinder rotates downward for drilling;

[0017] S3. As the rotary drilling cylinder gradually drills, the drilled soil enters the feeding cavity of the material guiding and compaction cylinder, and is supplied to the blanking and compaction cavity through the transportation of the feeding spiral blade. The soil located in the blanking and compaction cavity is conveyed downward by the blanking spiral blade and is extruded into the inner wall of the drilling hole through the compaction holes;

[0018] S4. When drilling to a soil layer with relatively soft soil quality, the drilled soil is not enough to meet the strength of the drilling hole. The construction personnel fill the spare soil on the ground into the drilling hole. This part of the soil enters the blanking and compaction cavity through the blanking port and is then compacted in the hole wall of the drilling hole;

[0019] S5. When it is necessary to pump out the accumulated water and silt in the drill hole, the relative area of the drill hole is sucked by a mud pump connected to a suction pipe; moreover, before suction, the rotary drilling cylinder can be rotated forward and backward to stir the silt and break larger soil blocks.

[0020] Due to the adoption of the above structure, compared with the prior art, the technical progress achieved by the present invention is as follows: The present invention drives the drill pipe to rotate, thereby driving the rotary drilling cylinder to rotate. The rotary teeth of the rotary drilling cylinder perform rotary drilling on the soil. As the rotary drilling cylinder gradually penetrates into the soil, the soil dug out by the rotary teeth is compacted to the hole wall through the compaction mechanism, and gradually improves the compaction degree of the soil near the hole wall; moreover, the method of the present invention can not only compact the drill hole firmly, but also perform pumping operations when there is accumulated water and silt in the drill hole, more effectively preventing the accident of hole collapse; in summary, it can be seen that the present invention compacts the hole wall of the drill hole firmly, improves the compaction degree of the soil in the area within the circumferential range of the drill hole, avoids the occurrence of hole collapse phenomenon, and provides a stable foundation for the subsequent installation of the steel reinforcement cage and the pouring of concrete. Description of the Drawings

[0021] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention.

[0022] In the drawings:

[0023] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 2 is an axial structural sectional view of an embodiment of the present invention;

[0025] Figure 3 is Figure 2 a magnified structural view of part A in

[0026] Figure 4 is Figure 2 a magnified structural view of part B in

[0027] Figure 5 is Figure 2 a magnified structural view of part C in

[0028] Figure 6 is a schematic structural diagram of the compaction mechanism of an embodiment of the present invention;

[0029] Figure 7 is the front view of the structural diagram of the compaction mechanism of an embodiment of the present invention.

[0030] Labeled components: 100 - drill pipe, 101 - hydraulic oil inlet channel, 102 - hydraulic oil return channel, 103 - silt discharge channel, 104 - connecting pipe, 105 - hydraulic oil adapter, 1051 - adapter body, 1052 - inlet cavity, 1053 - return cavity, 1054 - inlet joint, 1055 - return joint, 106 - second silt discharge adapter, 1061 - second adapter sleeve, 1062 - second liquid cavity, 1063 - joint pipe, 200 - rotary drilling cylinder, 201 - compaction hole, 202 - rotary drilling teeth, 203 - connecting sleeve, 204 - blanking opening, 300 - material guiding and compaction cylinder, 301 - feeding spiral blade, 302 - discharging spiral blade, 303 - material guiding opening, 400 - suction pipe, 500 - hydraulic motor, 501 - fixing plate, 600 - connecting rod, 601 - suction channel, 602 - guiding through hole, 700 - first adapter sleeve, 701 - first liquid cavity. Detailed implementation mode

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The present invention discloses a device for reusing soil matrix in pile foundation construction in a limited space, as Figure 1-2 shown, including a rotary drilling cylinder 200 and a compaction mechanism. Among them, the upper end of the rotary drilling cylinder 200 is detachably connected to the lower end of the drill pipe 100. A plurality of rotary drilling teeth 202 are arranged at one end of the rotary drilling cylinder 200 away from the drill pipe 100. These rotary drilling teeth 202 are evenly arranged along the circumferential direction of the rotary drilling cylinder 200. And in order to improve the rotary drilling effect, the tips of the rotary drilling teeth 202 extend downward out of the rotary drilling cylinder 200. A compaction mechanism is arranged in the rotary drilling cylinder 200, and this compaction mechanism is used to compact the rotary drilled soil on the inner wall of the drilling hole. The working principle and advantages of the present invention are as follows: The present invention drives the drill pipe 100 to rotate, so that the drill pipe 100 drives the rotary drilling cylinder 200 to rotate. The rotary drilling teeth 202 of the rotary drilling cylinder 200 rotary drill the soil. As the rotary drilling cylinder 200 gradually penetrates into the soil, the soil rotary drilled by the rotary drilling teeth 202 is compacted to the hole wall by the compaction mechanism, and gradually improves the compactness of the soil on the hole wall and its vicinity. Moreover, the method described in the present invention can not only compact the drilling hole firmly, but also perform pumping operation when there is accumulated water and silt in the drilling hole, more effectively preventing the accident of hole collapse. To sum up, the present invention compacts the hole wall of the drilling hole firmly, and improves the compactness of the soil in the area within the circumferential range of the drilling hole, avoiding the occurrence of hole collapse phenomenon, and providing a stable foundation for the subsequent installation of the steel reinforcement cage and the pouring of concrete.

[0033] As a preferred embodiment of the present invention, as Figure 2-3As shown in the figure, the compaction mechanism includes a material guiding and compaction cylinder 300, which is assembled inside the rotary drilling cylinder 200 and their axes coincide. Among them, in this embodiment, a feeding cavity is formed inside the material guiding and compaction cylinder 300, and a discharging and compaction cavity is formed between the outer wall of the material guiding and compaction cylinder 300 and the inner wall of the rotary drilling cylinder 200. A feeding spiral blade 301 is constructed on the inner wall of the material guiding and compaction cylinder 300, and a discharging spiral blade 302 is constructed on the outer wall of the material guiding and compaction cylinder 300. The feeding spiral blade 301 is used to convey the soil from the lower part of the rotary drilling cylinder 200 to the feeding port 303, and the discharging spiral blade 302 is used to convey the soil in the upper part of the discharging and compaction cavity to the compaction holes 201, and both the feeding spiral blade 301 and the discharging spiral blade 302 extend along the axis of the material guiding and compaction cylinder 300. In this embodiment, a plurality of feeding ports 303 are opened at the upper part of the material guiding and compaction cylinder 300, and the feeding cavity and the discharging and compaction cavity communicate with each other through these feeding ports 303. Moreover, in this embodiment, a plurality of compaction holes 201 are circumferentially opened at the lower position of the rotary drilling cylinder 200. The working principle of this embodiment is as follows: The soil being rotary drilled gradually moves upward in the feeding cavity under the action of the feeding spiral blade 301, and then enters the upper part of the discharging and compaction cavity through the feeding port 303. The discharging spiral blade 302 continuously conveys this part of the soil to the compaction holes 201 in a spiral manner, and during the rotation of the rotary drilling cylinder 200 and the discharging spiral blade 302, it is gradually compacted at the hole wall of the drill hole. The radial length of the material guiding and compaction cylinder 300 of this embodiment decreases upward along its axis, which is convenient for the soil to quickly enter the discharging and compaction cavity from the feeding cavity. Moreover, the gap between the outer wall of the material guiding and compaction cylinder 300 and the inner wall of the rotary drilling cylinder 200 gradually decreases downward in the vertical direction, and the gap is the smallest at the compaction holes 201. In this way, the efficiency and effect of soil compaction are better. The pitch of the feeding spiral blade 301 of this embodiment is greater than the pitch of the discharging spiral blade 302. Its main function is to make the feeding rate of the soil in the feeding cavity greater than the conveying rate of the soil downward in the discharging and compaction cavity. In this way, the soil is preliminarily compacted in the discharging and compaction cavity in advance, and then by controlling the downward movement speed of the rotary drilling cylinder 200, the soil is fully compacted on the hole wall of the drill hole through the compaction holes 201 from the discharging and compaction cavity. Moreover, by controlling the downward movement speed of the rotary drilling cylinder 200, different degrees of compaction can be achieved at different positions on the hole wall of the drill hole.

[0034] As a preferred embodiment of the present invention, as Figure 2 , Figure 4 , Figure 6-7As shown in the figure, a plurality of blanking ports 204 are formed at the upper end of the rotary drilling cylinder 200, and each blanking port 204 communicates with the blanking and compaction cavity. In this way, when the drilling hole wall and its nearby areas are relatively loose, the pre-prepared soil can be filled into the drilling hole through the upper end of the drilling hole. This part of the soil enters the blanking and compaction cavity through the blanking port 204, and is compacted into the drilling hole wall through the compaction holes 201 under the action of the blanking spiral blade 302.

[0035] As a preferred embodiment of the present invention, as Figure 2 , Figure 4 shown, the material guiding and compaction cylinder 300 is rotatably connected to the rotary drilling cylinder 200, that is, a flange extending radially outward along the lower end of the material guiding and compaction cylinder 300 is constructed, and this flange is rotatably connected to the lower part of the rotary drilling cylinder 200, and the upper end surface of the flange is not higher than the lower end surface of the compaction hole 201. Moreover, a driving mechanism is connected to the upper end of the material guiding and compaction cylinder 300 in this embodiment, and this driving mechanism drives the material guiding and compaction cylinder 300 to rotate along the axis of the rotary drilling cylinder 200. Specifically, the driving mechanism includes a hydraulic motor 500, and this hydraulic motor 500 is assembled in the assembly groove at the lower end of the drill pipe 100, and the output shaft of the hydraulic motor 500 is detachably connected to the upper end of the material guiding and compaction cylinder 300. In this embodiment, a hydraulic oil inlet channel 101 and a hydraulic oil return channel 102 are constructed in the drill pipe 100, the inlet end and the outlet end of the hydraulic motor 500 are respectively communicated with the hydraulic oil inlet channel 101 and the hydraulic oil return channel 102, and moreover, a hydraulic oil adapter 105 is rotatably connected to the drill pipe 100, and this hydraulic oil adapter 105 includes an adapter body 1051 rotatably connected to the drill pipe 100, as Figure 5 shown, the adapter body 1051 has an independent oil inlet cavity 1052 and an oil return cavity 1053, and an oil inlet joint 1054 and an oil return joint 1055 respectively communicated with the oil inlet cavity 1052 and the oil return cavity 1053 are constructed on the adapter body 1051, and the hydraulic oil adapter 105 is respectively communicated with the hydraulic oil inlet channel 101 and the hydraulic oil return channel 102. In this way, the rotation speed of the hydraulic motor 500 is controlled by hydraulic oil, so that in soil layers with different hardnesses, the amount of soil compacted at different positions of the drilling hole is different, that is, the degree of compaction of the drilling hole is different, thereby preventing the occurrence of the accident of hole collapse.

[0036] As a preferred embodiment of the present invention, in order to realize the extraction of accumulated water, silt, etc. in the drilling hole, and thus prevent the occurrence of hole collapse, the measures taken are, as Figure 2As shown, a suction pipe 400 extending along the axis is provided inside the material guiding and compaction cylinder 300. The suction pipe 400 communicates with the outside through a silt discharge channel 103, and the silt discharge channel 103 is constructed inside the drill pipe 100. Among them, in this embodiment, a connecting rod 600 is constructed at the upper end of the material guiding and compaction cylinder 300. A connecting flange is constructed at the upper end of the connecting rod 600. A fixed disk 501 is installed on the output shaft of the hydraulic motor 500, and the fixed disk 501 is connected to the connecting flange through a plurality of fastening bolts. The connecting rod 600 of this embodiment has a suction channel 601, and the suction channel 601 communicates with the above-mentioned suction pipe 400. In this embodiment, a first silt discharge adapter is rotatably connected to the connecting rod 600. A connecting sleeve 203 is constructed at the upper end of the rotary drilling cylinder 200, and the first silt discharge adapter is fixedly installed on the connecting sleeve 203. The first silt discharge adapter includes a first adapter sleeve 700, and a first liquid cavity 701 is formed inside the first adapter sleeve 700. A plurality of guide through holes 602 are provided on the connecting rod 600 and at the position of the first silt discharge adapter, and these guide through holes 602 communicate with the first liquid cavity 701. Both ends of the connecting pipe 104 communicate the first liquid cavity 701 of the first silt discharge adapter and the silt discharge channel 103. In this embodiment, a second silt discharge adapter 106 is rotatably installed on the drill pipe 100 and at the outlet end of the silt discharge channel 103. The second silt discharge adapter 106 includes a second adapter sleeve 1061 rotatably connected to the drill pipe 100. A second liquid cavity 1062 is formed inside the second adapter sleeve 1061. A joint pipe 1063 is constructed on the first adapter sleeve 700, and the joint pipe 1063 communicates with the second liquid cavity 1062, and the joint pipe 1063 is used to connect to a mud pump, thereby realizing the suction operation of accumulated water, silt, etc. in the drill hole.

[0037] The present invention also discloses a construction method of a device for reusing soil matrix in pile foundation construction in a confined space, including the following steps:

[0038] S1. Connect the rotary drilling cylinder 200 with the squeezing mechanism to the drill pipe 100 of the drilling rig;

[0039] S2. Drive the power head of the drilling rig to drive the drill pipe 100 to rotate and gradually displace downward, and the rotary drilling cylinder 200 rotates downward for drilling;

[0040] S3. As the rotary drilling cylinder 200 gradually drills, the drilled soil enters the feeding cavity of the material guiding and compaction cylinder 300, and is supplied to the lower material compaction cavity through the transportation of the feeding spiral blade 301. The soil located in the lower material compaction cavity is transported downward by the lower material spiral blade 302 and is extruded into the inner wall of the drill hole through the compaction holes 201;

[0041] S4. When rotary drilling reaches a soil layer with relatively soft soil, the soil drilled is not sufficient to meet the strength requirements of the borehole. Construction workers fill the spare soil on the ground into the borehole. This part of the soil enters the feeding and compaction cavity through the material dropping port 204 and is then compacted within the borehole wall.

[0042] S5. When it is necessary to pump out the accumulated water and silt in the borehole, a mud pump connected to the suction pipe 400 is used to suck the corresponding area of the borehole. Moreover, before suction, the rotary drilling cylinder 200 can be rotated forward and backward to break up larger soil blocks by stirring the silt. In order to avoid blockage of the suction channel before suction, the present invention pre-injects high-pressure gas into the suction channel to blow out sundries and the like.

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A device for reusing soil matrix in pile foundation construction in a confined space, characterized in that: It includes a rotary drilling cylinder detachably connected to one end of a drill pipe. A plurality of rotary drilling teeth are provided at the end of the rotary drilling cylinder away from the drill pipe, and the rotary drilling teeth are evenly arranged along the circumferential direction of the rotary drilling cylinder. A compaction mechanism is arranged in the rotary drilling cylinder for compacting the excavated soil into the inner wall of the drilling hole; the compaction mechanism includes a material guiding and compaction cylinder coaxially assembled in the rotary drilling cylinder. A feeding cavity is formed in the material guiding and compaction cylinder, and a discharging and compaction cavity is formed between the material guiding and compaction cylinder and the rotary drilling cylinder. A material guiding port communicating the feeding cavity and the discharging and compaction cavity is opened at the upper part of the material guiding and compaction cylinder. A plurality of compaction holes are opened along the circumferential direction at the lower position of the rotary drilling cylinder; on the inner wall and outer wall of the material guiding and compaction cylinder, a feeding spiral blade and a discharging spiral blade extending along its axis are respectively constructed. The feeding spiral blade is used for transporting the soil from the lower part of the rotary drilling cylinder to the material guiding port, and the discharging spiral blade is used for transporting the soil in the upper part of the discharging and compaction cavity to the compaction holes.

2. The device for reusing soil matrix in pile foundation construction in a confined space according to claim 1, characterized in that: The radial length of the material guiding and compaction cylinder decreases upward along its axis.

3. The device for reusing soil matrix in pile foundation construction in a confined space according to claim 1, wherein: The pitch of the feeding spiral blade is greater than the pitch of the discharging spiral blade.

4. A device for reusing soil matrix in pile foundation construction in a confined space according to claim 1, characterized in that: A plurality of blanking ports are opened at the upper end of the rotary drilling cylinder, and each blanking port communicates with the discharging and compaction cavity.

5. The device for reusing soil matrix in pile foundation construction in a confined space according to claim 1, characterized in that: The material guiding and compaction cylinder is rotationally connected to the rotary drilling cylinder, and a driving mechanism is connected to the upper end of the material guiding and compaction cylinder. The driving mechanism drives the material guiding and compaction cylinder to rotate along the axis of the rotary drilling cylinder.

6. The soil matrix recycling device in the construction of pile foundations in confined spaces according to claim 5, characterized in that: The driving mechanism includes a hydraulic motor assembled in the assembly groove at the lower end of the drill pipe. The output shaft of the hydraulic motor is detachably connected to the upper end of the material guiding and compaction cylinder. A hydraulic oil inlet channel and a hydraulic oil return channel are constructed in the drill pipe. The inlet end and the outlet end of the hydraulic motor are respectively communicated with the hydraulic oil inlet channel and the hydraulic oil return channel. And a hydraulic oil transfer piece is rotationally connected to the drill pipe. The hydraulic oil transfer piece is respectively communicated with the hydraulic oil inlet channel and the hydraulic oil return channel.

7. A device for reusing soil matrix in pile foundation construction in a confined space according to claim 5, characterized in that: A suction pipe extending along its axis is arranged in the material guiding and compaction cylinder. The suction pipe communicates with the outside through a silt discharge channel constructed in the drill pipe.

8. A device for reusing soil matrix in pile foundation construction in a confined space according to claim 7, characterized in that: A connecting rod connected to the output shaft of the hydraulic motor is constructed at the upper end of the material guiding and compaction cylinder. The connecting rod has a suction channel communicated with the suction pipe. A first silt discharge transfer piece is rotationally connected to the connecting rod. The first silt discharge transfer piece is fixedly connected to a connecting sleeve constructed at the upper end of the rotary drilling cylinder. A plurality of through holes are opened at the position of the connecting rod where the first silt discharge transfer piece is located. The two ends of a connecting pipe communicate the first silt discharge transfer piece and the silt discharge channel. And a second silt discharge transfer piece is rotationally installed at the outlet end of the silt discharge channel on the drill pipe.

9. A method based on the device for soil matrix reuse in pile foundation construction in a confined space as described in any one of claims 1-8, characterized in that, It includes the following steps: S1. Connect the rotary drilling cylinder with the compaction mechanism to the drill pipe of the drilling rig; S2. Drive the power head of the drilling rig to drive the drill pipe to rotate and gradually displace downward, and the rotary drilling cylinder rotates downward for drilling; S3. As the rotary drilling cylinder gradually drills, the excavated soil enters the feeding cavity of the material guiding and compaction cylinder, and is supplied to the discharging and compaction cavity through the transportation of the feeding spiral blade. The soil in the discharging and compaction cavity is transported downward by the discharging spiral blade and is extruded into the inner wall of the drilling hole through the compaction holes. S4. When rotary drilling reaches a soil layer with relatively soft soil, the soil drilled is not sufficient to meet the strength requirements of the borehole. Construction workers fill the borehole with spare soil on the ground. This part of the soil enters the blanking and compaction cavity through the material dropping port and is then compacted within the borehole wall. S5. When it is necessary to pump out the accumulated water and silt in the borehole, a slurry pump connected to the suction pipe is used to suck the corresponding area of the borehole. Moreover, before suction, the rotary drilling cylinder can be rotated forward and backward to stir the silt and break large soil blocks.

Images