CN114526007A

CN114526007A - Bidirectional stirring drilling tool for construction of large-diameter stirring pile

Info

Publication number: CN114526007A
Application number: CN202210127225.8A
Authority: CN
Inventors: 刘钟; 陈天雄; 张楚福
Original assignee: Zhejiang Kunde Innovate Geotechnical Engineering Co ltd
Current assignee: Zhejiang Kunde Innovate Geotechnical Engineering Co ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-05-24

Abstract

The invention relates to a bidirectional stirring drilling tool for construction of a large-diameter stirring pile, which comprises a double-frame bidirectional stirring drilling tool, wherein the double-frame bidirectional stirring drilling tool consists of an internal double-frame bidirectional stirring drilling tool or an external double-frame bidirectional stirring drilling tool; the beneficial effects of the invention are as follows: 1. the method is suitable for various soft and hard soil strata, and can be used for implementing the construction of the mixing pile in large-diameter, large-depth and complex strata; 2. the technical problem that solidified soil is discharged upwards along the gap between the drilling tool and the peripheral side of the drill rod when the traditional mixing pile drilling machine is constructed is solved; 3. the problem that the unidirectional rotation stirring pile drilling machine can not solve the problem of conglobation and embracing drilling in the construction of the viscous soil layer is solved; 4. the soil bodies and the curing agent are integrally stirred uniformly and fully mixed, so that a high-strength cured soil body can be formed; 5. under the condition that the solidified soil achieves the same integral strength, a large amount of curing agent materials can be saved; 6. ensures the excellent quality of the deep mixing pile, safe engineering, short construction period and low cost.

Description

Bidirectional stirring drilling tool for construction of large-diameter stirring pile

Technical Field

The invention belongs to the technical field of underground construction machinery, and particularly relates to a bidirectional stirring drilling tool for construction of a large-diameter stirring pile.

Background

As a main construction method in the technical field of foundation treatment engineering, the technology of a deep mixing pile with unidirectional rotation mixing is applied to the field of engineering and construction in the last 60 th century, and comprises the fields of civil engineering, constructional engineering, railway engineering, highway engineering, hydraulic engineering, municipal engineering, port engineering and the like. The deep mixing pile engineering technology adopts a single-shaft or multi-shaft mixing drilling machine to input cement and other curing agents into the ground, and the curing agents and soft and hard soil bodies are mixed by stirring, so that a series of physical and chemical reactions are generated between the curing agents and the soil bodies, and pile bodies, wall bodies and block bodies with high strength, good water stability and strong seepage-proofing performance are generated. Therefore, the bearing capacity of the composite foundation, the bearing capacity of the mixing pile, the bearing capacity of the stiffening core composite pile, the bearing capacity of the pile in the SMW construction method, the impermeability of the waterproof wall, the actual engineering problems of the sealing wall and the sealing layer of the landfill site of polluted soil and toxic substances and the like are effectively solved.

The deep mixing pile engineering technology has the advantages of simple drilling machine equipment, high construction efficiency, low cost and the like, and is widely applied to the field of civil construction. However, when a drilling tool and a process for constructing a stirring pile by unidirectional rotation stirring are applied, serious engineering quality problems of uneven soil stirring, upward discharge of solidified soil along a gap between the drilling tool and the periphery of a drill rod, conglomeration and embracing of the drill in the construction of a cohesive soil body, lower integral strength of the solidified soil than a designed value and the like often occur, and a serious engineering safety problem is often caused. Particularly, when a large-diameter and large-depth mixing pile is required to be adopted for construction in an engineering, and a single-power head, a unidirectional rotation mixing drilling tool and a technical construction are adopted, the engineering quality and the engineering safety risk are particularly highlighted, and even the phenomenon of sealing and killing use by an industrial administrative department and a local government occurs. The current civil construction market urgently needs to solve the technical problems, including the technical defects in the aspects of stirring pile engineering mechanical equipment, drilling tools and stirring pile construction processes, so that the deep stirring pile engineering technology can be reliably applied to wider engineering fields and more important civil construction engineering projects.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a bidirectional stirring drilling tool for large-diameter stirring pile construction, and the bidirectional stirring drilling tool driven by double power heads is introduced, so that the stirring pile with the diameter of 1000-3000 mm can be constructed by the drilling machine, and the drilling machine can be applied to complex stratums; under the action of torque and bit pressure of a double-power head of the drilling machine, the bidirectional stirring drilling tool can realize bidirectional rotation at the same speed or at variable speed, and because the rotation directions of the adjacent frame and the transverse stirring wing plate of the drilling tool are opposite, mutual shearing, kneading and crushing and strong stirring of the stirred soil are guaranteed, and the uniformity and high strength of the stirring pile can be realized.

The purpose of the invention is achieved by the following technical scheme that the bidirectional stirring drilling tool for the construction of the large-diameter stirring pile comprises a double-frame bidirectional stirring drilling tool, the double-frame bidirectional stirring drilling tool is composed of a built-in double-frame bidirectional stirring drilling tool or an external double-frame bidirectional stirring drilling tool, the built-in double-frame bidirectional stirring drilling tool comprises a first central shaft, and a convex U-shaped inner frame and an outer frame which are arranged on the outer peripheral side of the first central shaft and are equally spaced in the radial direction, the first central shaft is at least provided with two material conveying channels, and the first central shaft sequentially comprises a first outer pipe, a first inner pipe and a first central pipe from outside to inside; the outer frame is fixedly connected to the first outer pipe, the inner frame is fixedly connected to the first inner pipe, the outer frame is located on the outer side of the inner frame, and the outer frame and the inner frame are distributed along the radial direction of the first central shaft; the inner frame is provided with a first stirring wing plate, the outer frame is provided with a second stirring wing plate, the outer peripheral side of the first outer pipe in the inner frame is provided with a third transverse stirring wing plate, the first stirring wing plate and the second stirring wing plate are arranged at intervals, and the first stirring wing plate and the third transverse stirring wing plate are arranged at intervals; the external double-frame bidirectional stirring drilling tool comprises a second central shaft, and an outer convex U-shaped upper frame and an outer convex U-shaped lower frame which are arranged on the outer peripheral side of the second central shaft and are equally radially separated, wherein the second central shaft is at least provided with two material conveying channels, and comprises a second outer pipe, a second inner pipe and a second central pipe from outside to inside in sequence; the upper frame is fixedly connected to the second outer pipe, the lower frame is fixedly connected to the second inner pipe, a shaft sleeve assembly is mounted on the second inner pipe, and the shaft sleeve assembly is respectively connected with the upper frame and the lower frame; the upper frame is positioned above the lower frame and is axially distributed along the second central shaft; a third stirring wing plate is arranged on the upper frame, a fourth stirring wing plate is arranged on the lower frame, a fifth transverse stirring wing plate is arranged on the outer peripheral sides of the second inner pipe and the shaft sleeve assembly, and the third stirring wing plate and the fourth stirring wing plate are respectively arranged at intervals with the fifth transverse stirring wing plate; the lower ends of the central shafts of the built-in double-frame bidirectional stirring drilling tool and the external double-frame bidirectional stirring drilling tool are respectively provided with a front guide drill bit, and the upper ends of the central shafts are respectively provided with a connecting component for fixedly connecting the stirring drilling tool with the inner driving drill rod and the outer driving drill rod.

Preferably, the upper end of the outer frame is fixedly connected with the outer side wall of the first outer tube through a first fixing ring sleeve, the lower end of the outer frame is rotatably connected with the outer side wall of the first inner tube through a first annular limiting support bearing sleeve, and the outer frame can rotate along with the first outer tube; the upper end of the inner frame is rotatably connected with the outer side wall of the first outer pipe through a second annular limiting support bearing shaft sleeve, the lower end of the inner frame is fixedly connected with the outer side wall of the first inner pipe through a second fixing ring sleeve, and the inner frame can rotate along with the first inner pipe.

Preferably, the first base pipe is provided with a first material conveying channel, the annular gap between the first base pipe and the first inner pipe forms a second material conveying channel, and the annular gap between the first inner pipe and the first outer pipe forms a third material conveying channel; a transverse grouting pipe connected with the bottom of the first central pipe is provided with a first injection port and is positioned at the rear part of the rotation direction of the pilot bit, and the first injection port is communicated with the first material conveying channel; a second injection port is formed in the lower end of the first inner pipe and communicated with the second material conveying channel; the second stirring wing plate is internally provided with a hollow pipe shape and a third injection port, and is positioned on the inner side or the outer side of the second stirring wing plate, and the third injection port is communicated with the third material conveying channel.

As preferred, be equipped with the drainage in the third material transfer passage and prevent stifled mouthful subassembly, the drainage prevents stifled mouthful subassembly and is located the import department of the transverse channel that the second stirring pterygoid lamina was established, the drainage prevents stifled mouthful subassembly and includes sealed bearing and lifts the base, it fixes to lift the base in the third material transfer passage, sealed bearing installs lift on the base and with the third material transfer passage inner wall is sealed, just sealed bearing's up end with the lower terminal wall parallel and level of transverse channel's import department.

Preferably, a plurality of first injection ports on the transverse grouting pipe connected to the bottom of the first central pipe are sequentially arranged along the axial direction of the transverse grouting pipe, and the plurality of first injection ports are densely distributed from sparse to dense along the width direction of the frame; the horizontal grouting pipe connected to the bottom of the first central pipe is connected with a first pressure one-way valve pipe through a first return spring, one side of the first pressure one-way valve pipe is fixedly connected with one side of the horizontal grouting pipe through the first return spring, and the first pressure one-way valve pipe is provided with a first orifice which is the same as the first injection orifice in distribution form.

Preferably, the first stirring wing plate comprises a first transverse stirring wing plate and a first vertical stirring wing plate, and the second stirring wing plate comprises a second transverse stirring wing plate and a second vertical stirring wing plate; the first transverse stirring wing plates positioned on the outer side of the inner frame and the second transverse stirring wing plates positioned on the inner side of the outer frame are arranged at intervals along the height direction of the frame, and the first vertical stirring wing plates positioned on the upper and lower outer sides of the inner frame and the second vertical stirring wing plates positioned on the upper and lower inner sides of the outer frame are arranged at intervals along the width direction of the frame; the first transverse stirring wing plate and the third transverse stirring wing plate which are positioned on the inner side of the inner frame are arranged at intervals along the axial direction of the first central shaft.

Preferably, the shaft sleeve assembly comprises an annular limiting support bearing long shaft sleeve and an annular limiting support bearing short shaft sleeve, and the annular limiting support bearing short shaft sleeve is rotatably connected to the outer side wall of the annular limiting support bearing long shaft sleeve; the upper end of the upper frame is fixedly connected with the outer side wall of the second outer pipe through a third fixed ring sleeve, and the lower end of the upper frame is rotatably connected with the outer side wall of the second inner pipe through an annular limiting and supporting bearing long shaft sleeve, so that the upper frame can rotate along with the second outer pipe and drive the annular limiting and supporting bearing long shaft sleeve to rotate together; the upper end of the lower frame is rotatably connected with the outer side wall of the second inner pipe through an annular limiting supporting bearing short shaft sleeve, the lower end of the lower frame is fixedly connected with the outer side wall of the second inner pipe through a fourth fixing ring sleeve, and the lower frame can rotate along with the second inner pipe.

Preferably, the second base pipe is provided with a fourth material conveying channel, and an annular gap between the second base pipe and the second inner pipe forms a fifth material conveying channel; a fourth injection port is formed in the pipe wall of the lower end of the second central pipe and communicated with the fourth material conveying channel; the third transverse stirring wing plate is internally provided with a hollow pipe shape and a fifth injection port, the third transverse stirring wing plate is communicated with the fifth material conveying channel, the fifth transverse stirring wing plate with the fifth injection port is positioned in the upper frame, and the fifth injection port is positioned at the rear part of the fifth transverse stirring wing plate in the rotating direction.

Preferably, a plurality of fifth injection ports are sequentially arranged along the length direction of the fifth transverse stirring wing plate, and the fifth injection ports are densely distributed along the width direction of the frame from sparse to dense; a second pressure one-way valve pipe is connected in the fifth transverse stirring wing plate through a second return spring, one side of the second pressure one-way valve pipe is fixedly connected with one side of the fifth transverse stirring wing plate through a second return spring, and a second orifice which is the same as the fifth injection orifice in distribution form is formed in the second pressure one-way valve pipe.

Preferably, the third stirring wing plate comprises a third transverse stirring wing plate and a third vertical stirring wing plate, and the fourth stirring wing plate comprises a fourth transverse stirring wing plate and a fourth vertical stirring wing plate; the third transverse stirring wing plate and a fifth transverse stirring wing plate positioned on the second inner pipe are axially arranged at intervals along the second central shaft, and the fourth transverse stirring wing plate and a fifth transverse stirring wing plate positioned on the shaft sleeve component are axially arranged at intervals along the second central shaft; the third vertical stirring wing plate is vertically installed downwards at the bottom of the lower end face of the upper frame, the fourth vertical stirring wing plate is vertically installed upwards at the top of the upper end face of the lower frame, and the vertical stirring wing plates of the upper end face and the lower end face are arranged at intervals along the width direction of the frame.

The invention has the beneficial effects that: 1. the method is suitable for various soft and hard soil strata, and can be used for constructing the mixing pile in large-diameter, large-depth and complex strata; 2. the technical problem that solidified soil is discharged upwards along the gaps between the drilling tool and the peripheral sides of the drill rods during the construction of the traditional mixing pile drilling machine is solved; 3. the problem that the unidirectional rotation stirring pile drilling machine can not solve the problem of conglobation and embracing drilling in the construction of the viscous soil layer is solved; 4. the soil bodies and the curing agent are integrally stirred uniformly and fully mixed, so that a high-strength cured soil body can be formed; 5. under the condition that the solidified soil achieves the same integral strength, a large amount of curing agent materials can be saved; 6. ensures the excellent quality of the deep mixing pile, safe engineering, short construction period and low cost.

Drawings

Fig. 1 is a schematic view showing a structure in which a bidirectional stirring drill of the present invention is mounted on a drilling rig.

Fig. 2 is a schematic structural view of an external double-frame bidirectional stirring drilling tool according to a third embodiment of the invention.

Fig. 3 is a schematic view of the flow direction structure of the curing agent of the external double-frame bidirectional stirring drilling tool in the third embodiment of the invention.

Fig. 4 is a schematic structural view of a two-product bidirectional stirring drill according to a third embodiment of the present invention.

Fig. 5 is a schematic structural view of a three-product bidirectional stirring drill according to a third embodiment of the present invention.

Fig. 6 is a schematic structural view of a four-product bidirectional stirring drill according to a third embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a pilot bit according to a third embodiment of the present invention.

FIG. 8 is a structural diagram of the injection coverage area of the injection port according to a third embodiment of the invention.

FIG. 9 is a schematic view of a second nozzle distribution according to a third embodiment of the present invention.

Fig. 10 is a schematic view of an initial position structure of a pressure check valve pipe according to a third embodiment of the present invention.

Fig. 11 is a structural diagram of the pressure check valve pipe in an operating state according to the third embodiment of the present invention.

Fig. 12 is a schematic structural view of a built-in double-frame bidirectional stirring drill according to a first embodiment of the invention.

Fig. 13 is a schematic view of the flow direction structure of the curing agent of the built-in double-frame bidirectional stirring drill according to the first embodiment of the invention.

Fig. 14 is a schematic flow diagram of the curing agent of the built-in asymmetric double-frame bidirectional stirring drill according to the second embodiment of the invention.

Fig. 15 is a schematic view of a built-in asymmetric double-frame bidirectional stirring drill according to a second embodiment of the present invention.

Fig. 16 is a structural schematic diagram of a built-in asymmetric double-frame bidirectional stirring drill according to a second embodiment of the invention.

Fig. 17 is a schematic structural view of a drainage anti-clogging assembly according to a second embodiment of the present invention.

Fig. 18 is a schematic view of a two-product bidirectional stirring drill according to the first embodiment of the present invention.

Fig. 19 is a schematic structural view of a three-product bidirectional stirring drill according to the first embodiment of the invention.

Fig. 20 is a schematic structural view of a four-product bidirectional stirring drill according to the first embodiment of the present invention.

Fig. 21 is a structural diagram illustrating the injection coverage area of the injection ports according to the first and second embodiments of the present invention.

FIG. 22 is a schematic view showing the distribution structure of the first injection ports according to the first and second embodiments of the present invention.

Fig. 23 is a schematic view of the initial position structure of the pressure check valve tube according to the first and second embodiments of the present invention.

Fig. 24 is a structural diagram illustrating the working state of the pressure check valve tube according to the first and second embodiments of the present invention.

The reference numbers in the drawings are respectively: 1. a second central shaft; 2. an upper frame; 3. a lower frame; 4. a second pilot bit; 5. a second connection assembly; 6. the bearing long shaft sleeve is supported in an annular limiting manner; 7. the bearing short shaft sleeve is supported in an annular limiting way; 8. a third fixed ring sleeve; 9. a fourth fixed ring sleeve; 10. a second plate of wear resistant material; 11. a second outer tube; 12. a second inner tube; 13. a second center tube; 13-1, a fourth material conveying channel; 13-2, a fourth injection port; 14. a fifth transverse stirring wing plate; 14-1 and a fifth injection port; 15. a fifth material transfer passage; 16. a second return spring; 17. a second pressure check valve tube; 17-1, a second orifice; 21. a third stirring wing plate; 21-1, a third transverse stirring wing plate; 21-2, a third vertical stirring wing plate; 22. a second upper toothed plate; 31. a fourth stirring wing plate; 31-1, a fourth transverse stirring wing plate; 31-2, a fourth vertical stirring wing plate; 32. a second cutting pick; 100. a first central shaft; 101. an inner frame; 102. an outer frame; 103. a first outer tube; 104. a first inner tube; 105. a first center tube; 105-1, a first material transport channel; 105-2, a second material delivery channel; 105-3, a third material delivery channel; 105-4, a first injection port; 105-5, a second injection port; 105-6 and a third injection port; 106. a first fixed ring sleeve; 107. the first annular limiting support bearing shaft sleeve; 108. the second annular limit supports the bearing shaft sleeve; 109. a second fixed ring sleeve; 110. a transverse grouting pipe; 111. a first upper toothed plate; 112. a first cutting pick; 113. a first plate of wear resistant material; 200. a first stirring wing plate; 201. a first lateral mixing wing; 202. a first vertical stirring wing plate; 300. a second stirring wing plate; 301. a second lateral stirring wing plate; 302. a second vertical stirring wing plate; 303. a transverse channel; 400. a third transverse stirring wing plate; 500. a first pilot bit; 600. a first connection assembly; 700. a drainage anti-clogging component; 701. sealing the bearing; 702. lifting the base; 801. a first return spring; 802. a first pressure check valve tube; 802-1, first orifice; 900. a drilling machine; 901. a double-power head; 902. an inner driving drill rod and an outer driving drill rod.

Detailed Description

The invention will be described in detail below with reference to the following drawings:

the first embodiment is as follows:

the engineering background of this embodiment is to construct a shaped steel cement soil mixing pile wall (SMW method pile) for deep foundation pit support, the pile length of the mixing pile is 33m, the pile diameter is 1100mm, the length of the H-shaped steel pile is 33m, the section of the H-shaped steel is 850x300, the 28-day unconfined compressive strength of the mixing pile is not less than 0.8MPa, and the permeability coefficient k is 10^-7cm/s。

Basic conditions of the present embodiment: the two layers of foundation soil of the field are (i) cohesive soil with the thickness of 16m, the water content w is 41%, e is 1.32, SPT is 5-9, and (ii) silty sandy soil with the thickness of 28m, the water content w is 32%, and SPT is 15-26; adopting 42.5 cement, adding 3% of bentonite, mixing the cement with 16% of water-cement ratio of 1.2-1.5, and spreading the curing agent slurry by adopting a double-channel cement slurry spraying method; the construction drilling machine 900 adopts a double-power head 901 electrically driven by 2x16tm and a built-in double-frame bidirectional stirring drilling tool, and adopts a one-spraying and two-stirring construction process of a stirring pile and an H-shaped steel vibration insertion construction process in construction.

As shown in fig. 1, 12, 13, and 18 to 24, the built-in double-frame bidirectional stirring drill comprises a first central shaft 100, and further comprises an outer convex U-shaped inner frame 101 and an outer frame 102 which are installed on the outer periphery side of the first central shaft 100 and equally spaced in the radial direction, the first central shaft 100 is provided with at least two material conveying channels, and the first central shaft 100 sequentially comprises a first outer pipe 103, a first inner pipe 104, and a first central pipe 105 from outside to inside; the outer frame 102 is fixedly connected to the first outer tube 103, the inner frame 101 is fixedly connected to the first inner tube 104, and the outer frame 102 is located outside the inner frame 101 and radially distributed along the first central axis 100; the inner frame 101 is provided with a first stirring wing plate 200, the outer frame 102 is provided with a second stirring wing plate 300, the outer periphery side of the first outer pipe 103 in the inner frame 101 is provided with a third transverse stirring wing plate 400, the first stirring wing plate 200 and the second stirring wing plate 300 are arranged at intervals, and the first stirring wing plate 200 and the third transverse stirring wing plate 400 are arranged at intervals; the first pilot bit 500 is installed at the lower end of the first central shaft 100, and the first connection assembly 600 for fixedly connecting the churning drill to the inner and outer kelly 902 is installed at the upper end of the first central shaft 100. For example: the first outer pipe 103 rotates clockwise during the stirring construction, so the outer frame 102 and the second stirring wing 300 connected with the outer frame also rotate clockwise, and simultaneously the third transverse stirring wing 400 on the first outer pipe 103 also rotates clockwise; the first inner pipe 104 rotates counterclockwise during the stirring construction, so the inner frame 101 and the first stirring wing plate 200 connected thereto also rotate counterclockwise; thereby realizing mutual shearing, kneading and crushing and strong stirring of the reinforced soil body between the stirring wing plates.

The upper end of the outer frame 102 is fixedly connected with the outer side wall of the first outer pipe 103 through a first fixing ring sleeve 106, the lower end of the outer frame 102 is rotatably connected with the outer side wall of the first inner pipe 104 through a first annular limiting and supporting bearing shaft sleeve 107, and the outer frame 102 can rotate along with the first outer pipe 103; the upper end of the inner frame 101 is rotatably connected with the outer side wall of the first outer pipe 103 through a second annular limiting support bearing shaft sleeve 108, the lower end of the inner frame 101 is fixedly connected with the outer side wall of the first inner pipe 104 through a second fixing ring sleeve 109, and the inner frame 101 can rotate along with the first inner pipe 104; thus, the inner frame and the outer frame do not influence each other when rotating and can rotate in the same direction or in the opposite direction independently.

The first base pipe 105 is provided with a first material conveying channel 105-1, the annular gap between the first base pipe 105 and the first inner pipe 104 forms a second material conveying channel 105-2, and the annular gap between the first inner pipe 104 and the first outer pipe 103 forms a third material conveying channel 105-3; the material conveying channel can be used for conveying gas, water, slurry or powdery curing agent.

The transverse grouting pipe 110 connected with the bottom of the first central pipe 105 is provided with a first injection port 105-4 and is positioned at the rear part of the first pilot drill bit 500 in the rotating direction, and the first injection port 105-4 is communicated with the first material conveying channel 105-1; the lower end of the first inner pipe 104 is provided with a second injection port 105-5, and the second injection port 105-5 is communicated with a second material conveying channel 105-2; the second stirring wing plate 300 is of a built-in hollow tubular shape, is provided with a third injection port 105-6 and is positioned on the inner side or the outer side of the second stirring wing plate 300, the second stirring wing plate 300 refers to a second vertical stirring wing plate 302, and the third injection port 105-6 is communicated with the third material conveying channel 105-3; the material in the material conveying channel is conveniently injected into the deep soil body through the injection port. As shown in fig. 21 and 22, a plurality of first injection ports 105-4 on the transverse grouting pipe 110 connected to the bottom of the first central pipe 105 are sequentially arranged along the axial direction of the transverse grouting pipe 110, and the plurality of first injection ports 105-4 are densely distributed from sparse to dense along the width direction of the frame; after the stirring drill rotates for one circle, the coverage area swept by each injection port is equal. As shown in fig. 23 and 24, a first pressure check valve pipe 802 is connected to the inside of the transverse grouting pipe 110 connected to the bottom of the first central pipe 105 through a first return spring 801, one side of the first pressure check valve pipe 802 is fixedly connected to one side of the transverse grouting pipe 110 through the first return spring 801, and the first pressure check valve pipe 802 is provided with a first orifice 802-1 in the same distribution form as the first injection port 105-4; the difficult problem that the curing agent cannot be injected due to the blockage of the first injection port can be solved, the waste of curing materials is reduced, and the frequent cleaning of a slurry conveying pipe is avoided. The working principle is as follows: when the mixing pile grouting is started, under the action of the grouting pressure, the first return spring 801 is compressed to drive the first pressure one-way valve pipe 802 to move rightwards, the first orifices 802-1 move to the positions of the first grouting openings 105-4 and are aligned one by one, and at the moment, the first grouting openings 105-4 are opened to start grouting; when grouting is stopped, the first return spring 801 returns to the initial position, the first pressure check valve pipe 802 moves leftwards and covers the first injection port 105-4, and the first injection port 105-4 is protected from being blocked by soil.

The first stirring wing plate 200 comprises a first transverse stirring wing plate 201 and a first vertical stirring wing plate 202, and the second stirring wing plate 300 comprises a second transverse stirring wing plate 301 and a second vertical stirring wing plate 302; the first transverse stirring wing plate 201 positioned outside the inner frame 101 and the second transverse stirring wing plate 301 positioned inside the outer frame 102 are arranged at intervals along the height direction of the frame, and the first vertical stirring wing plate 202 positioned on the upper and lower outer sides of the inner frame 101 and the second vertical stirring wing plate 302 positioned on the upper and lower inner sides of the outer frame 102 are arranged at intervals along the width direction of the frame; the first transverse stirring wing plate 201 and the third transverse stirring wing plate 400 which are positioned at the inner side of the inner frame 101 are arranged at intervals along the axial direction of the first central shaft 100; the structure arrangement enables the soil body to realize the integral uniformity and high strength of the solidified soil through mutual shearing, kneading and crushing and strong stirring.

The upper end of the outer side of the outer frame 102 is provided with a first upper toothed plate 111 which is vertically upward and plays a role in secondary stirring in the construction process of the drilling machine in the ascending stage; the lower end of the outer side of the outer frame 102 is provided with a first cutting tooth 112 which plays a role in drilling and stirring in the construction process of the descending stage of the drilling machine; the down-going or up-going construction of the stirring drilling tool is more convenient, and the construction efficiency and effect are greatly improved.

The vertical outer side walls of the outer frame 102 and the inner frame 101 are provided with first wear-resistant material plates 113, so that the service life of the frame structure can be greatly prolonged.

As shown in fig. 18 to 20, the convex U-shaped inner frame 101 and the outer frame 102 are equally spaced by 180 degrees, 120 degrees or 90 degrees and are radially provided with frames of two-product, three-product or four-product structure; the frame thus formed may be of a symmetrical or asymmetrical form, and particularly in the case of large-diameter mixing piles, it is generally preferred to adopt an asymmetrical form, as shown in fig. 14 to 16, and the size and shape of each inner frame 101 and each outer frame 102 may be set to different sizes and forms.

The working principle of the embodiment is as follows:

and (3) construction at a descending stage of the drilling machine: determining the pile position of a mixing pile, starting a drilling machine and a background slurry supply system after the drilling machine is in place, respectively applying clockwise and anticlockwise torques and vertical drilling pressures to an inner drilling rod and an outer drilling rod according to set construction parameters, performing drilling and stirring operations in a descending stage of the drilling machine, and simultaneously implementing quantitative spreading of a curing agent through the injection port by using a high-pressure grouting pump; because the rotating directions of the adjacent transverse stirring wing plates of the drilling tool are opposite, the reinforced soil body can be fully and integrally mixed uniformly by mutual shearing, kneading and crushing and strong stirring; and completing the construction in the downward drilling and stirring operation stage until the downward operation of the stirring drilling tool reaches the designed pile bottom elevation.

Construction in an ascending stage of the drilling machine: the drilling machine continues to apply torque and lifting force opposite to those in the descending stage to the inner drill rod and the outer drill rod according to the set construction parameters, and secondary stirring operation of the stirring pile in the ascending stage of the drilling machine is carried out; the secondary curing agent can be quantitatively spread by utilizing the spraying nozzle at the moment according to construction requirements; in the secondary stirring operation stage, the drilling machine can improve the rotation speed and the lifting speed of the built-in double-frame bidirectional stirring drilling tool, and the soil body and the curing agent slurry are subjected to secondary sufficient mutual shearing and repeated stirring by utilizing the mutual reverse rotation of the vertical stirring wing plate and the transverse stirring wing plate of each adjacent inner frame and outer frame until the ascending operation of the bidirectional stirring mechanism reaches the designed pile top elevation, so that the construction in the ascending stirring operation stage is completed; the construction operation of the mixing pile adopting the one-spraying two-stirring or two-spraying two-stirring construction process is completed at the stage.

Example two:

the engineering background of this embodiment is that the major diameter stirring stake in the composite foundation terrace of construction near sea ore stockyard, the stake length is 16m, and the stake footpath is 3000mm, and stirring stake composite foundation design limit bearing capacity is 280kPa, and stirring stake 28 days unconfined compressive strength is not less than 1.2 MPa.

Basic case of the examples: the site foundation soil is deep sea phase saturated soft clay foundation with water content w equal to 65%, e equal to 1.3 and q equal to_c＝0.2MPa，f_s6kPa, SPT is 3-8, the surface soil of the site is a hard shell layer with the thickness of 3m, and the bearing capacity of the foundation is 100 kPa; the curing agent adopts KD1, the mixing amount is 15%, and the dry powder and the slurry injection of the curing agent are carried out by using a powder and slurry injection method; the construction drilling machine 900 adopts a double-power head 901 electrically driven by 2x18tm and a built-in double-frame directional stirring drilling tool, and a one-spraying and two-stirring construction process is applied to construction.

The difference of the built-in double-frame directional stirring drilling tool from the first embodiment is as follows: as shown in fig. 14 to 16, an asymmetric inner and outer frame is adopted, and the transverse grouting pipe 110 connected to the bottom of the first central pipe 105 is provided with a first injection port 105-4 and located at the rear part of the rotation direction of the first pilot bit 500, and the first injection port 105-4 is communicated with the first material conveying channel 105-1; the lower end of the first inner pipe 104 is provided with a second injection port 105-5, and the second injection port 105-5 is communicated with a second material conveying channel 105-2; the second stirring wing plate 300 is a hollow pipe with a third injection port 105-6 inside or outside the second stirring wing plate 300, the second stirring wing plate 300 is a second vertical stirring wing plate 302, and the third injection port 105-6 is communicated with the third material conveying passage 105-3. As shown in fig. 21 and 22, a plurality of first injection ports 105-4 are sequentially arranged on the transverse grouting pipe 110 connected to the bottom of the central pipe 105 along the axial direction of the transverse grouting pipe 110, and the plurality of first injection ports 105-4 are distributed from sparse to dense along the width direction of the frame. As shown in fig. 23 and 24, a first pressure check valve pipe 802 is connected to the inside of the transverse grouting pipe 110 connected to the bottom of the first central pipe 105 through a first return spring 801, one side of the first pressure check valve pipe 802 is fixedly connected to one side of the transverse grouting pipe 110 through the first return spring 801, and the first pressure check valve pipe 802 is provided with first orifices 802-1 having the same distribution pattern as that of the first injection ports 105-4. The working principle is as follows: when the mixing pile grouting is started, under the action of the grouting pressure, the first return spring 801 is compressed, the first pressure one-way valve pipe 802 moves rightwards, the first orifices 802-1 move to the position of the first grouting opening 105-4 and are aligned one by one, and the first grouting opening 105-4 is opened for grouting; when grouting is stopped, the first return spring 801 returns to the initial position, the first pressure check valve pipe 802 covers the first injection port 105-4, and the first injection port 105-4 is protected from being blocked by soil.

As shown in fig. 17, a drainage anti-blocking assembly 700 is disposed in the third material conveying passage 105-3, the drainage anti-blocking assembly 700 is located at an inlet of the transverse passage 303 disposed on the second stirring wing plate 300, the drainage anti-blocking assembly 700 includes a sealing bearing 701 and a lifting base 702, the lifting base 702 is fixed in the third material conveying passage 105-3, the sealing bearing 701 is mounted on the lifting base 702 and sealed with an inner wall of the third material conveying passage 105-3, and an upper end surface of the sealing bearing 701 is flush with a lower end wall of the inlet of the transverse passage 303.

Example three:

the engineering background of this embodiment is a stiff core composite pile of a foundation pile for constructing a small high-rise residential building, the length of a mixing pile is 30m, the diameter of the mixing pile is 1200mm, the length of a PHC pipe pile is 30m, the diameter of the PHC pipe pile is 800mm, and the design limit bearing capacity of a single pile is 4800 kN.

Basic conditions of the present embodiment: the three layers of foundation soil of the field are cohesive soil with the thickness of 14m, the water content of w being 38%, e being 1.3, SPT being 3-8, silt soil with the thickness of 13m, the water content of w being 29%, e being 1.0, SPT being 7-20, fine sandy soil with the thickness of 9m, the water content of w being 35%, and SPT being 14-27; adopting KD curing agent product with the doping amount of 14 percent and the water-cement ratio of 0.6, and adopting a double-channel slurry injection method to spread curing agent slurry; the construction drilling machine 900 adopts a double-power head 901 and an external double-frame bidirectional stirring drilling tool which are hydraulically driven by 2x20tm, and a one-spraying and two-stirring construction process of a stirring pile and a holding and pressing construction process of a PHC pipe pile are applied to construction.

As shown in fig. 1 to 11, the external double-frame bidirectional stirring drill comprises a second central shaft 1, and further comprises an outer convex U-shaped upper frame 2 and a lower frame 3 which are installed on the outer periphery side of the second central shaft 1 and are equally spaced in the radial direction, wherein the central shaft 1 is at least provided with two material conveying channels, and the second central shaft 1 sequentially comprises a second outer pipe 11, a second inner pipe 12 and a second central pipe 13 from outside to inside; the upper frame 2 is fixedly connected to the second outer pipe 11, the lower frame 3 is fixedly connected to the second inner pipe 12, and the second inner pipe 12 is provided with a shaft sleeve assembly which is respectively connected with the upper frame 2 and the lower frame 3; the upper frame 2 is positioned above the lower frame 3 and is axially distributed along the second central shaft 1; the upper frame 2 is provided with a third stirring wing plate 21, the lower frame 3 is provided with a fourth stirring wing plate 31, the outer peripheral sides of the inner pipe 12 and the shaft sleeve assembly are provided with a fifth transverse stirring wing plate 14, and the third stirring wing plate 21 and the fourth stirring wing plate 31 are respectively arranged at intervals with the fifth transverse stirring wing plate 14; the lower end of the second central shaft 1 is provided with a second pilot bit 4, and the upper end of the second central shaft 1 is provided with a second connecting component 5 for fixedly connecting the stirring drilling tool with the inner and outer active drilling rods 902. For example: the second outer pipe 11 rotates clockwise in the stirring construction process, so the upper frame 2 and the third stirring wing plate 21 connected with the upper frame also rotate clockwise, and meanwhile, the fifth transverse stirring wing plate 14 on the annular limiting support bearing long shaft sleeve 6 also rotates clockwise; the second inner pipe 12 rotates counterclockwise in the stirring construction process, so the lower frame 3 and the fourth stirring wing plate 31 connected with the lower frame also rotate counterclockwise, and simultaneously the fifth transverse stirring wing plate 14 on the second inner pipe 12 rotates counterclockwise; thereby realizing mutual shearing, kneading and crushing and strong stirring of the reinforced soil body between the stirring wing plates.

The convex U-shaped upper frame 2 and the convex U-shaped lower frame 3 are evenly separated by 180 degrees, 120 degrees or 90 degrees and are radially provided with frames with two-product, three-product or four-product structures; as shown in figures 4 to 6.

The shaft sleeve assembly comprises an annular limiting support bearing long shaft sleeve 6 and an annular limiting support bearing short shaft sleeve 7, and the annular limiting support bearing short shaft sleeve 7 is rotatably connected to the outer side wall of the annular limiting support bearing long shaft sleeve 6; the upper end of the upper frame 2 is fixedly connected with the outer side wall of the outer pipe 11 through a third fixing ring sleeve 8, the lower end of the upper frame 2 is rotatably connected with the outer side wall of the second inner pipe 12 through an annular limiting support bearing long shaft sleeve 6, the upper frame can rotate along with the second outer pipe 11, and the annular limiting support bearing long shaft sleeve 6 is driven to rotate together; the upper end of the lower frame 3 is rotatably connected with the outer side wall of the second inner pipe 12 through an annular limiting supporting bearing short shaft sleeve 7, the lower end of the lower frame 3 is fixedly connected with the outer side wall of the second inner pipe 12 through a fourth fixing ring sleeve 9, and the lower frame 3 can rotate along with the second inner pipe 12; therefore, the upper frame and the lower frame do not influence each other when rotating and can rotate in the same direction or in the opposite direction independently.

As shown in FIG. 3, the second base pipe 13 is provided with a fourth material transfer passage 13-1, and the annular gap between the second base pipe 13 and the second inner pipe 12 forms a fifth material transfer passage 15; the material conveying channel is used for conveying the curing agent.

A fourth injection port 13-2 is formed in the pipe wall of the lower end of the second central pipe 13, and the fourth injection port 13-2 is communicated with a fourth material conveying channel 13-1; the fifth transverse stirring wing plate 14 is internally provided with a hollow tube shape and is provided with a fifth injection port 14-1, the fifth transverse stirring wing plate 14 is communicated with a fifth material conveying channel 15, the fifth transverse stirring wing plate 14 with the fifth injection port 14-1 is positioned in the upper frame 2, and the fifth injection port 14-1 is positioned at the rear part of the fifth transverse stirring wing plate 14 in the rotating direction; the solidified material in the material conveying channel is conveniently injected into the deep soil body through the injection port. As shown in fig. 9, a plurality of fifth injection ports 14-1 are sequentially arranged along the length direction of the fifth transverse stirring wing plate 14, and the plurality of fifth injection ports 14-1 are densely distributed from sparse to dense along the width direction of the frame; so that the coverage area swept by each injection nozzle is equal after the stirring drilling tool rotates one circle. As shown in fig. 10 and 11, a second pressure check valve tube 17 is connected to the fifth transverse stirring wing plate 14 through a second return spring 16, one side of the second pressure check valve tube 17 is fixedly connected to one side of the fifth transverse stirring wing plate 14 through the second return spring 16, and a second orifice 17-1 having the same distribution pattern as the fifth injection orifice 14-1 is formed in the second pressure check valve tube 17; the difficult problem that the solidified material cannot be injected due to the blockage of the fifth injection port can be solved, the waste of the solidified material is reduced, and the work of frequently cleaning the slurry conveying pipe is avoided. The working principle is as follows: when the mixing pile grouting is started, under the action of the grouting pressure, the second return spring 16 is compressed to drive the second pressure one-way valve pipe 17 to move rightwards, the second orifices 17-1 move to the positions of the fifth grouting openings 14-1 and are aligned one by one, and the fifth grouting openings 14-1 are opened for grouting; when grouting stops, the second return spring 16 returns to the initial position, the second pressure one-way valve pipe 17 covers the fifth injection port 14-1, and the fifth injection port 14-1 is protected from being blocked by soil.

The third stirring wing plate 21 comprises a third transverse stirring wing plate 21-1 and a third vertical stirring wing plate 21-2, and the fourth stirring wing plate 31 comprises a fourth transverse stirring wing plate 31-1 and a fourth vertical stirring wing plate 31-2; the third transverse stirring wing plate 21-1 and the fifth transverse stirring wing plate 14 positioned on the second inner pipe 12 are arranged at intervals along the axial direction of the second central shaft 1, and the fourth transverse stirring wing plate 31-1 and the fifth transverse stirring wing plate 14 positioned on the shaft sleeve component are arranged at intervals along the axial direction of the second central shaft 1; the third vertical stirring wing plate 21-2 is vertically and downwards arranged at the bottom of the lower end surface of the upper frame 2, the fourth vertical stirring wing plate 31-2 is vertically and upwards arranged at the top of the upper end surface of the lower frame 3, and the vertical stirring wing plates at the upper end surface and the lower end surface are arranged at intervals along the width direction of the frame; the structure arrangement enables the soil body to realize the integral uniformity and high strength of the solidified soil through mutual shearing, kneading and crushing and strong stirring.

A second upper toothed plate 22 which is vertically upward is arranged at the top of the upper end surface of the upper frame 2, and plays a role in secondary stirring in the construction process of the drilling machine in the ascending stage; the bottom of the lower end face of the lower frame 3 is provided with a second cutting pick 32 which plays a role in stirring in the construction process of the descending stage of the drilling machine; the down-going or up-going construction of the stirring drilling tool is more convenient, and the construction efficiency and effect are greatly improved.

The vertical outer side walls of the upper frame 2 and the lower frame 3 are provided with second wear-resistant material plates 10; the service life of the frame structure can be prolonged.

The working principle of the embodiment is as follows:

Construction in an ascending stage of the drilling machine: the drilling machine continues to apply torque and lifting force opposite to those in the descending stage to the inner drill rod and the outer drill rod according to the set construction parameters, and secondary stirring operation of the stirring pile in the ascending stage of the drilling machine is carried out; the secondary curing agent can be quantitatively spread by utilizing the spraying nozzle at the moment according to construction requirements; in the secondary stirring operation stage, the drilling machine can improve the rotation speed and the lifting speed of the external double-frame bidirectional stirring drilling tool, and the soil body and the curing agent slurry are subjected to secondary sufficient mutual shearing and repeated stirring by utilizing the mutual reverse rotation of the vertical stirring wing plate and the transverse stirring wing plate of each adjacent frame until the ascending operation of the bidirectional stirring mechanism reaches the designed pile top elevation, so that the construction in the ascending stirring operation stage is completed; the construction operation of the mixing pile adopting the one-spraying two-stirring or two-spraying two-stirring construction process is completed at the stage.

The present invention is not limited to the above embodiments, and any changes in the shape or material composition, or any changes in the structural design provided by the present invention, are all modifications of the present invention, and should be considered within the scope of the present invention.

Claims

1. The utility model provides a two-way stirring drilling tool for major diameter stirring stake construction which characterized in that: the double-frame bidirectional stirring drilling tool comprises a double-frame bidirectional stirring drilling tool, wherein the double-frame bidirectional stirring drilling tool consists of a built-in double-frame bidirectional stirring drilling tool or an external double-frame bidirectional stirring drilling tool, the built-in double-frame bidirectional stirring drilling tool comprises a first central shaft (100), and an outer convex U-shaped inner frame (101) and an outer frame (102) which are installed on the outer peripheral side of the first central shaft (100) and are uniformly and radially separated, the first central shaft (100) is at least provided with two material conveying channels, and the first central shaft (100) sequentially comprises a first outer pipe (103), a first inner pipe (104) and a first central pipe (105) from outside to inside; the outer frame (102) is fixedly connected to the first outer tube (103), the inner frame (101) is fixedly connected to the first inner tube (104), and the outer frame (102) is positioned outside the inner frame (101) and distributed along the first central shaft (100) in the radial direction; a first stirring wing plate (200) is arranged on the inner frame (101), a second stirring wing plate (300) is arranged on the outer frame (102), a third transverse stirring wing plate (400) is arranged on the outer peripheral side of the first outer pipe (103) in the inner frame (101), the first stirring wing plate (200) and the second stirring wing plate (300) are arranged at intervals, and the first stirring wing plate (200) and the third transverse stirring wing plate (400) are arranged at intervals; the external double-frame bidirectional stirring drilling tool comprises a second central shaft (1), and an outer convex U-shaped upper frame (2) and a lower frame (3) which are arranged on the outer peripheral side of the second central shaft (1) and are equally divided in the radial direction, wherein the second central shaft (1) is at least provided with two material conveying channels, and the second central shaft (1) sequentially comprises a second outer pipe (11), a second inner pipe (12) and a second central pipe (13) from outside to inside; the upper frame (2) is fixedly connected to the second outer tube (11), the lower frame (3) is fixedly connected to the second inner tube (12), a shaft sleeve assembly is mounted on the second inner tube (12), and the shaft sleeve assembly is respectively connected with the upper frame (2) and the lower frame (3); the upper frame (2) is positioned above the lower frame (3) and is axially distributed along the second central shaft (1); a third stirring wing plate (21) is arranged on the upper frame (2), a fourth stirring wing plate (31) is arranged on the lower frame (3), a fifth transverse stirring wing plate (14) is installed on the outer peripheral sides of the second inner pipe (12) and the shaft sleeve assembly, and the third stirring wing plate (21) and the fourth stirring wing plate (31) are respectively arranged at intervals with the fifth transverse stirring wing plate (14); the lower ends of the central shafts of the built-in double-frame bidirectional stirring drilling tool and the external double-frame bidirectional stirring drilling tool are respectively provided with a front guide drill bit, and the upper ends of the central shafts are respectively provided with a connecting component for fixedly connecting the stirring drilling tool with an inner driving drill rod and an outer driving drill rod (902).

2. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 1, wherein: the upper end of the outer frame (102) is fixedly connected with the outer side wall of the first outer tube (103) through a first fixing ring sleeve (106), the lower end of the outer frame (102) is rotatably connected with the outer side wall of the first inner tube (104) through a first annular limiting support bearing shaft sleeve (107), and the outer frame (102) can rotate along with the first outer tube (103); the upper end of the inner frame (101) is rotatably connected with the outer side wall of the first outer pipe (103) through a second annular limiting supporting bearing shaft sleeve (108), the lower end of the inner frame (101) is fixedly connected with the outer side wall of the first inner pipe (104) through a second fixing ring sleeve (109), and the inner frame (101) can rotate along with the first inner pipe (104).

3. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 1, wherein: the first base pipe (105) is provided with a first material conveying channel (105-1), the annular gap between the first base pipe (105) and the first inner pipe (104) forms a second material conveying channel (105-2), and the annular gap between the first inner pipe (104) and the first outer pipe (103) forms a third material conveying channel (105-3); a transverse grouting pipe (110) connected with the bottom of the first central pipe (105) is provided with a first injection port (105-4) and is positioned at the rear part of the rotation direction of the pilot bit, and the first injection port (105-4) is communicated with the first material conveying channel (105-1); a second injection port (105-5) is formed in the lower end of the first inner pipe (104), and the second injection port (105-5) is communicated with the second material conveying channel (105-2); the second stirring wing plate (300) is internally provided with a hollow pipe shape and is provided with a third injection port (105-6) and is positioned on the inner side or the outer side of the second stirring wing plate (300), and the third injection port (105-6) is communicated with the third material conveying channel (105-3).

4. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 3, wherein: be equipped with drainage in third material transfer passage (105-3) and prevent stifled mouthful subassembly (700), drainage is prevented stifled mouthful subassembly (700) and is located the import department of the transverse channel (303) that second stirring pterygoid lamina (300) were established, drainage is prevented stifled mouthful subassembly (700) and is included sealed bearing (701) and lift base (702), it fixes to lift base (702) in third material transfer passage (105-3), sealed bearing (701) are installed lift base (702) on and with third material transfer passage (105-3) inner wall is sealed, just the up end of sealed bearing (701) with the lower extreme wall parallel and level of the import department of transverse channel (303).

5. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 3, wherein: a plurality of first injection ports (105-4) on the transverse grouting pipe (110) connected with the bottom of the first central pipe (105) are sequentially arranged along the axial direction of the transverse grouting pipe (110), and the plurality of first injection ports (105-4) are densely distributed along the width direction of the frame from open to close; the horizontal grouting pipe (110) connected with the bottom of the first central pipe (105) is internally connected with a first pressure one-way valve pipe (802) through a first return spring (801), one side of the first pressure one-way valve pipe (802) is fixedly connected with one side of the horizontal grouting pipe (110) through the first return spring (801), and the first pressure one-way valve pipe (802) is provided with a first orifice (802-1) which is the same as the distribution form of the first injection port (105-4).

6. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 1, wherein: the first stirring wing plate (200) comprises a first transverse stirring wing plate (201) and a first vertical stirring wing plate (202), and the second stirring wing plate (300) comprises a second transverse stirring wing plate (301) and a second vertical stirring wing plate (302); the first transverse stirring wing plate (201) positioned on the outer side of the inner frame (101) and the second transverse stirring wing plate (301) positioned on the inner side of the outer frame (102) are arranged at intervals along the height direction of the frame, and the first vertical stirring wing plate (202) positioned on the upper and lower outer sides of the inner frame (101) and the second vertical stirring wing plate (302) positioned on the upper and lower inner sides of the outer frame (102) are arranged at intervals along the width direction of the frame; the first transverse stirring wing plate (201) and the third transverse stirring wing plate (400) which are positioned on the inner side of the inner frame (101) are arranged at intervals along the axial direction of the first central shaft (100).

7. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 1, wherein: the shaft sleeve assembly comprises an annular limiting support bearing long shaft sleeve (6) and an annular limiting support bearing short shaft sleeve (7), and the annular limiting support bearing short shaft sleeve (7) is rotatably connected to the outer side wall of the annular limiting support bearing long shaft sleeve (6); the upper end of the upper frame (2) is fixedly connected with the outer side wall of the second outer pipe (11) through a third fixing ring sleeve (8), the lower end of the upper frame (2) is rotatably connected with the outer side wall of the second inner pipe (12) through an annular limiting support bearing long shaft sleeve (6), the upper frame can rotate along with the second outer pipe (11), and the annular limiting support bearing long shaft sleeve (6) is driven to rotate together; the upper end of the lower frame (3) is rotatably connected with the outer side wall of the second inner tube (12) through an annular limiting supporting bearing short shaft sleeve (7), the lower end of the lower frame (3) is fixedly connected with the outer side wall of the second inner tube (12) through a fourth fixing ring sleeve (9), and the lower frame can rotate along with the second inner tube (12).

8. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 1, wherein: the second central pipe (13) is provided with a fourth material conveying channel (13-1), and an annular gap between the second central pipe (13) and the second inner pipe (12) forms a fifth material conveying channel (15); a fourth injection port (13-2) is formed in the pipe wall of the lower end of the second central pipe (13), and the fourth injection port (13-2) is communicated with the fourth material conveying channel (13-1); the third transverse stirring wing plate (14) is internally provided with a hollow pipe shape and is provided with a fifth spraying opening (14-1), the third transverse stirring wing plate is communicated with the fifth material conveying channel (15), the fifth transverse stirring wing plate (14) with the fifth spraying opening (14-1) is positioned in the upper frame (2), and the fifth spraying opening (14-1) is positioned at the rear part of the fifth transverse stirring wing plate (14) in the rotating direction.

9. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 8, wherein: a plurality of fifth injection ports (14-1) are sequentially arranged along the length direction of the fifth transverse stirring wing plate (14), and the fifth injection ports (14-1) are densely distributed along the width direction of the frame from sparse to dense; a second pressure one-way valve pipe (17) is connected in the fifth transverse stirring wing plate (14) through a second return spring (16), one side of the second pressure one-way valve pipe (17) is fixedly connected with one side of the fifth transverse stirring wing plate (14) through the second return spring (16), and a second orifice (17-1) which is the same as the fifth injection port (14-1) in distribution form is formed in the second pressure one-way valve pipe (17).

10. The bidirectional stirring drilling tool for large-diameter stirring pile construction according to claim 1, wherein: the third stirring wing plate (21) comprises a third transverse stirring wing plate (21-1) and a third vertical stirring wing plate (21-2), and the fourth stirring wing plate (31) comprises a fourth transverse stirring wing plate (31-1) and a fourth vertical stirring wing plate (31-2); the third transverse stirring wing plate (21-1) and a fifth transverse stirring wing plate (14) positioned on the second inner pipe (12) are axially arranged at intervals along the second central shaft (1), and the fourth transverse stirring wing plate (31-1) and the fifth transverse stirring wing plate (14) positioned on the shaft sleeve assembly are axially arranged at intervals along the second central shaft (1); the third vertical stirring wing plate (21-2) is vertically and downwards installed at the bottom of the lower end face of the upper frame (2), the fourth vertical stirring wing plate (31-2) is vertically and upwards installed at the top of the upper end face of the lower frame (3), and the vertical stirring wing plates of the upper end face and the lower end face are arranged at intervals along the width direction of the frame.