CN220847530U

CN220847530U - Stirring drill bit mechanism for multilayer mutual shearing stirring pile drilling machine

Info

Publication number: CN220847530U
Application number: CN202321965453.9U
Authority: CN
Inventors: 文磊; 刘钟; 陈天雄; 杨宁晔; 张楚福
Original assignee: Zhejiang Kunde Innovate Geotechnical Engineering Co ltd
Current assignee: Zhejiang Kunde Innovate Geotechnical Engineering Co ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2024-04-26
Anticipated expiration: 2033-07-24

Abstract

The utility model relates to the technical field of stirring pile drilling machines, in particular to a stirring drill bit mechanism for a multilayer mutual shearing stirring pile drilling machine, which comprises an inner drill rod, an outer drill rod, a stirring inner shaft and a stirring outer frame, wherein the stirring inner shaft is fixedly connected with the inner drill rod; the stirring outer frame is fixedly connected with the outer drill rod, at least one group of inner stirring blade groups are arranged on the peripheral wall of the stirring inner shaft, and each group of inner stirring blade groups comprises a plurality of inner stirring blades which are distributed radially at the same or different heights; a plurality of first desorption protrusions are arranged on the upper side and/or the lower side of each inner stirring blade; at least one group of outer stirring blade groups are arranged on the inner side wall of the stirring outer frame; the outer stirring vane group comprises a plurality of outer stirring vanes which are distributed in the radial direction at the same or different heights; a plurality of second desorbing bumps are provided on the upper side and/or the lower side of each outer stirring vane. The utility model has the advantages that by arranging the desorption bump structure, a non-smooth discontinuous interface can be formed, and the effect of drag reduction and desorption is achieved.

Description

Stirring drill bit mechanism for multilayer mutual shearing stirring pile drilling machine

Technical Field

The utility model relates to the technical field of stirring pile drilling machines, in particular to a stirring drill bit mechanism for a multilayer mutual shearing stirring pile drilling machine.

Background

The deep mixing method has the technical advantages of simple drilling machine equipment, high construction efficiency, low cost and the like, is widely applied to the fields of civil engineering, highway engineering, hydraulic engineering, municipal engineering and the like, and utilizes a deep mixing pile machine to spray a curing agent into a stratum to be reinforced while drilling; simultaneously, the drill bit rotates and stirs, so that the curing agent sprayed into the soil layer and the in-situ soil body are fully stirred together, and the reinforcement is formed after hardening. The reinforcement can be singly formed into pile bodies, and the pile bodies and soil between piles form a composite foundation, and can also be cut and lapped to form a continuous wall for seepage prevention in foundation pit, dykes and dams and other projects. After the deep mixing pile is constructed, the slurry and the in-situ soil body are mixed to form solidified soil, and under the condition that the design parameters such as the site, the water-cement ratio, the type of the solidifying agent and the doping ratio are consistent, the performance of the solidified soil mainly depends on the uniformity degree of mixing the slurry and the soil body, namely, the more the times of mechanically cutting the soil body and the more the soil body is fully mixed with cement paste, the more uniform the reinforcement body is after solidification, and the better the performance is. However, when the unidirectional rotation stirring deep mixing pile construction equipment and process are applied, serious engineering quality problems such as uneven stirring of soil body and curing agent, upward soil returning and slurry returning along the clearance between a drilling tool and the periphery of a drill rod, easy agglomeration and holding drilling in viscous soil body construction, and overall strength of the cured soil being lower than a design value are often generated, and particularly in large-diameter and large-depth mixing pile construction.

The patent 1-bidirectional cement soil stirring pile foundation (application number is CN 200410065961.4) realizes coaxial bidirectional stirring, solves the slurry-overflowing problem, mainly adopts a double-power and double-pipe form, wherein a drill rod mainly adopts a welding connection form, and no reliable sealing and guiding measures are adopted, so that the fault rate is higher, only the interface between an inner drill rod and an outer drill rod is in a shearing stirring form, one layer of mutual shearing is realized, namely the blades of the inner drill rod and the outer drill rod are actually in up-down bidirectional stirring, and the stirring and mixing efficiency is still not high enough.

Patent 2-a double-shaft stirring drill bit (application number is CN 201910681520.6) capable of realizing bidirectional stirring is arranged under a similar power transmission machine, a single-tube mode is adopted, a lower drill rod and an upper drill rod which reversely rotate are connected through bearings, but the bearing mechanism needs to consider the rotation strength around the shaft when being stressed axially, so that the requirement on materials is high.

The patent mainly aims at the technical problems of uneven stirring, fault rate reduction and the like, the bidirectional stirring mode mainly comprises up-down reverse rotation, only one layer of mutual shearing stirring exists at the interface of the reverse rotation of the inner rod and the outer rod, and the influence of the drill bit and the blade mode on the stirring performance is not considered; when constructing in high plasticity clay, easily cause the phenomenon of soil body adhesion drilling tool such as armful boring, paste boring, cause construction torque grow, reduced the effective utilization ratio of moment of torsion, especially when carrying boring and do not spout the thick liquid process, owing to lack the lubrication of thick liquid, construction torque is showing and is increasing, and then causes the poor scheduling problem of whole stirring homogeneity effect.

Disclosure of utility model

The utility model aims to solve the technical problem that soil bodies such as a holding drill, a sticking drill and the like are easy to adhere to a drilling tool when the traditional stirring drill mechanism is constructed, and further the stirring uniformity effect is poor.

The utility model aims at realizing the following technical scheme:

The stirring drill bit mechanism for the multilayer mutual shearing stirring pile drilling machine comprises an inner drill rod, an outer drill rod, a stirring inner shaft and a stirring outer frame, wherein the stirring inner shaft is fixedly connected with the inner drill rod; an inner shaft channel for conveying materials is arranged in the stirring inner shaft; the stirring outer frame is fixedly connected with the outer drill rod, and surrounds the stirring inner shaft; at least one group of inner stirring blade groups are arranged on the peripheral wall of the stirring inner shaft, each group of inner stirring blade groups comprises a plurality of inner stirring blades which are distributed in the radial direction at the same or different heights, and a plurality of first desorption protrusions are arranged on the upper side and/or the lower side of each inner stirring blade; at least one group of outer stirring blade groups are arranged on the inner side wall of the stirring outer frame; the outer stirring blade group comprises a plurality of outer stirring blades which are distributed in the radial direction at the same or different heights, and a plurality of second desorption lugs are arranged on the upper side and/or the lower side of each outer stirring blade; the inner stirring blade and the outer stirring blade can rotate relatively and do not interfere with each other. Through set up desorption lug structure on stirring vane and outer stirring vane in, can form non-smooth discontinuous interface, play the effect of drag reduction desorption, and then promote stirring homogeneity effect.

Preferably, a plurality of outer frame desorption protrusions are arranged on the axial outer side wall of the stirring outer frame. Through set up desorption lug structure on the axial lateral wall at stirring frame, can form non-smooth discontinuous interface, play the effect of drag reduction desorption, and then promote stirring effect.

Preferably, the inner stirring blade sets are multiple groups, the multiple groups of inner stirring blade sets are axially arranged on the peripheral wall of the stirring inner shaft at intervals, and the axial distance between every two adjacent inner stirring blade sets is 0.1-10 delta (delta is the thickness of the stirring blades); the inner stirring blade forms an included angle of 0-30 degrees with the horizontal direction, and the front end part of the inner stirring blade is processed into a certain gradient when the inner stirring blade is used for stirring and cutting soil clockwise, and the gradient ratio is 1:5-1:20; the outer stirring blade forms an included angle of 0-30 degrees with the horizontal direction, and the front end part of the outer stirring blade is processed into a certain gradient when the outer stirring blade is used for downwards stirring and cutting soil body clockwise, and the gradient ratio is 1:5-1:20; the inner stirring blade and the outer stirring blade have overlap lengths in the radial direction; the lap joint length is 1/10-1/5D. The stable stirring effect can be further ensured to be achieved through the inner stirring blade according to the parameters, and the power utilization efficiency of the drilling machine and the stirring uniformity are improved.

Preferably, the stirring outer frame comprises an upper outer frame sleeve plate, a lower outer frame sleeve plate and a plurality of U-shaped stirring frames; the upper outer frame sleeve plate is fixedly sleeved on the outer drill rod, the lower outer frame sleeve plate is rotatably sleeved on the stirring inner shaft, and the outer peripheral walls of the upper outer frame sleeve plate and the lower outer frame sleeve plate are provided with a plurality of radial support plates which are arranged at intervals; the two side plates of each U-shaped stirring frame are respectively and fixedly connected with two radial support plates aligned up and down, and the outer stirring blades are arranged on the axial inner side wall of the U-shaped stirring frame; the outer frame desorption lug is arranged on the axial outer side wall of the U-shaped stirring frame. Through U type stirring frame detachable structure, conveniently change and maintain, promote the convenience of dismouting.

Preferably, the device further comprises a plurality of outer frame tunneling blades; the plurality of outer frame tunneling blades are arranged at intervals at the lower end of the stirring outer frame; each outer frame tunneling blade forms an included angle of 0-30 degrees with the horizontal direction; the front end part of the soil body is processed into a certain gradient when the soil body is cut by clockwise downward stirring, and the gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; second stirring soil digging teeth are arranged at the gradient of the front end of the upper surface of the outer frame tunneling blade at a certain interval along the radial direction; the second stirring digging tooth forms an included angle of 0-30 degrees with the radial long side of the outer frame digging blade, the length of the second stirring digging tooth is matched with the included angle of the outer frame digging blade, and the overlapping part of the area swept by the second stirring digging tooth on the left outer frame digging blade and the right outer frame digging blade in the rotating process is met. Through the structure, the drilling effect of the drilling tool in soil is improved, the construction efficiency of the drilling machine is improved, and the power consumption of the drilling machine is reduced; meanwhile, the circumferential cutting of the stirring soil-digging tooth can provide a path or a channel for the diffusion of slurry, so that the uniformity of slurry mixing is improved from the slurry spraying.

Preferably, a second guniting pipe is arranged below the stirring blade in the layer at the bottommost end of the stirring inner shaft, a second guniting hole is arranged in the middle of the stirring blades in two adjacent horizontal branches, and a second plug is detachably connected to the second guniting hole. Through effective guniting or powder spraying of second guniting pipe and second guniting hole when stirring, the drilling tool of being convenient for adjusts the injection quantity of curing agent according to the change of pile body diameter better, realizes the pile body stirring homogeneity of stirring stake.

Preferably, the device further comprises a tunneling drill; the tunneling drill bit is fixedly connected to the lower end of the stirring inner shaft; a plurality of inner shaft tunneling blades are arranged on the tunneling drill head at intervals and are radially arranged; each inner shaft tunneling blade forms an included angle of 0-30 degrees with the horizontal direction; the front end part of the soil body is processed into a certain gradient when the soil body is cut by clockwise downward stirring, and the gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; first stirring soil digging teeth are arranged at the gradient of the front end of the upper surface of the inner shaft tunneling blade at a certain interval along the radial direction; the first stirring digging tooth forms an included angle of 0-30 degrees with the radial long side of the inner shaft digging blade, the length of the first stirring digging tooth is matched with the included angle of the inner shaft digging blade, and the part that the area swept by the first stirring digging tooth on the left inner shaft digging blade and the right inner shaft digging blade is overlapped in the rotating process is met; the included angle between the first stirring digging tooth and the axial direction of the stirring inner shaft is 5-35 degrees, and the first stirring digging tooth is arranged towards the center direction of the stirring inner shaft. Through the arrangement of the inner shaft tunneling blades on the tunneling drill head, the drilling effect of the drilling tool in soil can be improved, the construction efficiency of the drilling machine is improved, and the power consumption of the drilling machine is reduced; meanwhile, the circumferential cutting of the stirring soil-digging tooth can provide a path or a channel for the diffusion of slurry, so that the uniformity of slurry mixing is improved from the slurry spraying.

Preferably, a first guniting hole is formed in the stirring inner shaft and positioned in the direction perpendicular to the inner shaft tunneling blade; a first plug is detachably connected to the first guniting hole; a first guniting pipe is arranged below the inner shaft tunneling blade along the radial direction; the outer wall of the first guniting pipe is provided with a guniting seam communicated with the interior of the first guniting pipe. Through the guniting hole and the guniting seam, effective guniting or powder spraying can be carried out during stirring, so that a drilling tool can better adjust the spraying amount of the curing agent according to the change of the diameter of the pile body, and the pile body stirring uniformity of the stirring pile is realized.

Preferably, the inner shaft channel is arranged in a circular arc shape at the radial turning part of the first guniting hole and the guniting seam; the diameter of the circular arc-shaped rounding is 1/3-1.0 do (do is the diameter of the inner shaft channel). The smooth nature of material transportation can be further guaranteed through arc transition to can further ensure smooth nature and the stability of guniting, the stifled tub problem of in-process is carried to solution thick liquid that can be better simultaneously.

Preferably, the grouting slits are arranged in different widths along the radial direction, and the slit sectional areas of the grouting slits are matched with the corresponding sectional areas of the material conveying channels and the slurry conveying pressure. The spraying amount of different pile body radial positions during stirring is further guaranteed through the spraying seam, and the stirring uniformity effect is realized.

In summary, the utility model has the advantages that the non-smooth discontinuous interface can be formed by arranging the desorption bump structures on the axial outer side wall, the inner stirring blade and the outer stirring blade of the stirring outer frame respectively, thereby having the effects of drag reduction and desorption and improving the stirring uniformity; the high-rigidity tunneling drill bit and the tunneling blade are matched with the stirring soil-digging tooth, so that the whole tunneling performance of the drilling machine is good, the drilling machine can penetrate through a hard interlayer, and the application range is wider; the slurry spraying holes and slurry spraying seams on the multi-layer mutual shearing stirring drill head are combined, so that liquid slurry or solid powder can be conveyed, and the liquid slurry or solid powder can be used singly or in combination; the radial guniting seam solves the problem of uneven distribution of the slurry amount from the guniting source.

Drawings

Fig. 1 is a schematic view of a first perspective structure of a stirring bit mechanism (disposed on a stirring inner shaft) according to the present invention.

Fig. 2 is a schematic view of a second perspective of the stirring bit mechanism (disposed on the stirring inner shaft) of the present invention.

Fig. 3 is a schematic view of the structure of the bottom of the stirring bit mechanism in the present invention.

Fig. 4 is a schematic view of the construction of the gunite seam in the present invention.

Fig. 5 is a schematic view of the structure of the stirring bit mechanism (drilling is provided on the stirring frame) in the present invention.

FIG. 6 is a schematic representation of the equation for the slotted cross-sectional area of a gunite slot in the present invention.

FIG. 7 is a schematic diagram of the equation of the slit size of the gunite slit in the present invention.

Wherein: 31. stirring the inner shaft; 311. an inner stirring blade; 312. a first desorbing bump; 313. a first guniting hole; 314. a first guniting pipe; 315. a guniting seam; 316. a second guniting pipe; 317. a second guniting hole; 32. stirring the outer frame; 321. an upper outer frame sleeve plate; 322. a lower outer frame sleeve plate; 323. a U-shaped stirring frame; 324. a radial support plate; 3241. bolt holes; 325. a bolt; 326. an outer stirring blade; 327. a second desorption bump; 328. the outer frame desorbs the protruding block; 33. tunneling a drill bit; 331. an inner shaft tunneling blade; 332. the first stirring digging tooth; 34. an outer frame tunneling blade; 341. the second stirring digging tooth; 35. and (5) tunneling the drill point.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

As shown in fig. 1 to 2, a stirring drill bit mechanism for a multi-layer inter-shear stirring pile (Contra-SHEAR DEEP mixing pile, abbreviated as CS-DSM pile) drilling machine comprises an inner drill rod, an outer drill rod, a stirring inner shaft 31 and a stirring outer frame 32, wherein the stirring inner shaft 31 is fixedly connected with the inner drill rod; an inner shaft channel for conveying materials is arranged in the stirring inner shaft 31; the stirring outer frame 32 is fixedly connected with the outer drill rod, and the stirring inner shaft 31 is surrounded by the stirring outer frame 32; at least one inner stirring blade group is arranged on the outer peripheral wall of the stirring inner shaft 31, and each inner stirring blade group comprises a plurality of inner stirring blades 311 which are distributed along the radial direction at the same or different heights; a plurality of first desorption protrusions 312 are disposed on the upper side and/or the lower side of each inner stirring blade 311, and in this embodiment, as shown in fig. 1, a plurality of first desorption protrusions 312 distributed in an array are disposed on the upper side and the lower side of each inner stirring blade 311. At least one outer stirring blade group is arranged on the inner side wall of the stirring outer frame 32; the outer stirring vane set includes a plurality of outer stirring vanes 326 radially distributed at the same or different heights; a plurality of second desorption protrusions 327 are provided on the upper side and/or the lower side of each outer stirring vane 326; in this embodiment, as shown in fig. 1, a plurality of second desorption protrusions 327 distributed in an array are disposed on the upper side and the lower side of each inner stirring vane 311. The inner stirring blade 311 and the outer stirring blade 326 can rotate relatively and do not interfere with each other; an inner shaft channel communicated with the material conveying channel is arranged in the stirring inner shaft 31; a plurality of outer frame desorption protrusions 328 are disposed on the axial outer side wall of the stirring outer frame 32. By providing the desorption bump structure on the axial outer side wall of the stirring outer frame 32, the inner stirring blade 311 and the outer stirring blade 326, a non-smooth discontinuous interface can be formed, and the effect of drag reduction and desorption is achieved.

As shown in fig. 1 to 2, the first desorption bump 312, the outer frame desorption bump 328 and the second desorption bump 327 have the same structure, are mainly used for high-plasticity clay geological conditions, are formed by processing steel materials, are semi-ellipsoidal, have a spherical bottom diameter of 5-40 mm and a height of about 2-10 mm, and form a non-smooth discontinuous interface through welding and fixing, so that the effect of drag reduction and desorption is achieved.

As shown in fig. 1 and 2, in this embodiment, two inner stirring blade sets are arranged on the outer peripheral wall of the stirring inner shaft 31 at intervals in the axial direction, and the distance between two adjacent inner stirring blade sets in the depth direction is 0-10 delta (delta is the thickness of the stirring blades); each inner stirring blade group comprises three inner stirring blades 311 which are radially distributed in the same depth direction, an included angle (downward inclination rotates clockwise to cut soil) is formed between the inner stirring blades 311 and the horizontal direction by 0-30 degrees, the front end part of each inner stirring blade group when the inner stirring blades stir clockwise to cut soil is processed into a certain gradient, each gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; a plurality of first desorption protrusions 312 are distributed on the earth facing surface of each inner stirring blade 311 in an array manner. The stable stirring effect can be further ensured by the inner stirring blade 311 according to the parameters, and a non-smooth discontinuous interface is formed by the first desorption bump 312, so that the effect of drag reduction and desorption is achieved.

As shown in fig. 1 to 2, the stirring frame 32 includes an upper frame cover plate 321, a lower frame cover plate 322, and a plurality of U-shaped stirring frames 323; the upper outer frame sleeve plate 321 is fixedly sleeved on the outer drill rod, the lower outer frame sleeve plate 322 is rotatably sleeved on the stirring inner shaft 31, and the outer peripheral walls of the upper outer frame sleeve plate 321 and the lower outer frame sleeve plate 322 are provided with a plurality of radial support plates 324 which are arranged at intervals; the present embodiment is to arrange three radial support plates 324 at equal intervals; the three radial support plates 324 correspond to the three U-shaped stirring frames 323; two curb plates of every U type stirring frame 323 are respectively with two radial extension boards 324 fixed connection of aligning from top to bottom, and carry out fixed connection through a plurality of array distribution bolt hole sites 3241 and the corresponding quantity of bolts 325 on radial extension board 324 and on two curb plates of U type stirring frame 323, make things convenient for dismouting, change and carry out the size adjustment in radial. The outer stirring blade 326 and the inner stirring blade 311 are arranged in a staggered manner, and can rotate relatively without interference; the inner stirring vane 311 and the outer stirring vane 326 have overlapping lengths in the radial direction; the lap joint length is 1/10-1/5D (D is the construction diameter of the stirring pile), so that the stirring range can be fully covered. Each outer stirring blade 326 forms an included angle of 0-30 degrees with the horizontal direction, (downward inclination is opposite to time rotation soil cutting), and the front end part of each outer stirring blade is processed into a certain gradient when the soil body is cut by clockwise downward stirring, and the front end part is wedge-shaped, and the gradient ratio is 1:5-1:20; through U type stirring frame 323 detachable structure, conveniently change and maintain, promote the convenience of dismouting, outer stirring vane 326 can further ensure to reach stable stirring effect according to above-mentioned parameter simultaneously.

As shown in fig. 1 to 4, the stirring device further comprises a tunneling drill bit 33, wherein the tunneling drill bit 33 is fixedly connected to the lower end of the stirring inner shaft 31; the plurality of inner shaft tunneling blades 331 are arranged at intervals and are radially arranged on the tunneling drill bit 33, and the tunneling drill bit 33 is provided with two inner shaft tunneling blades 331 which are symmetrically distributed and are radially arranged; the inner shaft ripper blade 331 is machined from steel. Each inner shaft tunneling blade 331 forms an included angle of 0-30 degrees with the horizontal direction (downward inclination rotates clockwise to cut soil); the front end part of the soil body is processed into a certain gradient when the soil body is cut by clockwise downward stirring, and the gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; first stirring digging teeth 332 are arranged on the slope of the upper surface of the inner shaft digging blade 331 at certain intervals along the radial direction; the first stirring excavator tooth 332 is made of a wear-resistant hard alloy material, such as high manganese steel, chromium-molybdenum steel and the like. The first stirring and digging tooth 332 forms an included angle of 0-30 degrees with the radial long side of the inner shaft tunneling blade 331, the length of the first stirring and digging tooth should be matched with the included angle of the blades, the overlapping part of the area swept by the stirring and digging teeth on the left inner shaft tunneling blade 331 and the right inner shaft tunneling blade 331 in the rotating process is met, and the length of the first stirring and digging tooth 332 extending out of the inner shaft tunneling blade 331 should extend downwards and can cover the outlet of the slurry spraying seam 315 in the horizontal direction so as to prevent the slurry spraying seam 315 from being blocked. The first stirring excavator tooth 332 has an angle of 5 to 35 degrees with respect to the axial direction of the stirring inner shaft 31, and is arranged toward the center direction of the stirring inner shaft 31. By providing the inner shaft ripper blade 331 on the ripper bit 33, a uniform stirring effect can be ensured. A first guniting hole 313 is formed in the stirring inner shaft 31 in a direction perpendicular to the inner shaft driving blade 331; the aperture of the first spraying hole 313 is 1.0-5.0 cm, the threaded hole is detachably connected with a plug, and the plug can be selectively removed or installed according to construction requirements to open or close the first spraying hole 313; a first guniting pipe 314 is arranged below the inner shaft tunneling blade 331 along the radial direction, the first guniting pipe 314 is formed by processing steel pipes, a guniting seam 315 communicated with the inside of the first guniting pipe 314 is arranged on the outer wall of the first guniting pipe 314, and the guniting seam 315 is arranged at a position attached to the inner shaft tunneling blade 331. The slurry can be sprayed through the first slurry spraying holes 313 and the slurry spraying slits 315 during stirring, so that the stirring of the solidified soil body can be better performed. The inner shaft channel is arranged in a circular arc shape at the radial turning part of the first spraying hole 313 and the second spraying slit 315; the diameter of the circular arc-shaped rounding is 0.3-1.0 d _o(d_o which is the diameter of the inner shaft channel). The smooth nature of material transportation can be further guaranteed through arc transition to can further ensure smooth nature and the stability of spouting.

As shown in fig. 6, the grouting slits 315 are arranged with different widths along the radial direction, the slit sectional area of the grouting slits is matched with the corresponding material conveying channel sectional area and the corresponding material conveying pressure, and the slit sectional area of the grouting slits is a ₂,d_i which is the single-section slit width of the sectional grouting slits 315; x _i has a single-segment transverse length that is the segmented grout gap 315; dx is a micro-element section of the curved guniting seam; d (x) is a function of the variation of the width of the curved gunite seam along with x;

the size of the slotting sectional area of the guniting seam is determined as follows, wherein A ₁、z₁、v₁、p₁ and A ₂、z₂、v₂、p₂ are the sectional area, depth, flow velocity and slurry pressure of the guniting pipe inlet and the guniting seam outlet respectively, g is gravity acceleration; ρ is the density of the transport fluid; neglecting the viscous drag of the fluid, the mass conservation and the energy conservation of the ideal fluid have the following formulas:

the flow rate and pressure control equation for the gunite outlet can be obtained:

The sectional dimension A2 of the slit sectional area of the gunite slit, and the single-stage lateral length di and the single-stage lateral length xi of the sectional gunite slit 315 are set according to the formula (1), the formula (2), the formula (3), and the construction requirement of the slurry delivery pressure. The slurry spraying seam can further ensure that the design of the slurry spraying seam achieves the optimal slurry spraying effect through the calculation of the formula, thereby further ensuring the slurry spraying amount of different pile body radial positions during stirring and realizing the stirring uniformity effect.

As shown in fig. 1 to 2, the boring bit 33 is driven by agitating the inner shaft 31, and a plurality of the inner shaft boring blades 331 are arranged at intervals and radially provided on the boring bit 33. The stirring drill bit has reasonable overall stress form and reliable structure in the tunneling process, and the inclination direction of the inner shaft tunneling blades 331 is opposite to the direction of the outer stirring blades 326 on the stirring outer frame 32.

As shown in FIG. 5, another form is shown, including a plurality of outer frame ripper blades 34; a plurality of outer frame tunneling blades 34 are arranged at intervals at the lower end of the stirring outer frame 32; and is fixedly connected with the lower outer frame sheathing plate 322 in an integral structure. A tunneling drill tip 35 is arranged at the lower end of the stirring inner shaft 31, and each outer frame tunneling blade 34 forms an included angle of 0-30 degrees with the horizontal direction; the front end part of the soil body is processed into a certain gradient when the soil body is cut by clockwise downward stirring, and the gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; second stirring digging teeth 341 are arranged at the front end slope of the upper surface of the outer frame digging blade 34 at a certain interval along the radial direction; the second stirring digging tooth 341 forms an included angle of 0-30 degrees with the radial long side of the outer frame digging blade 34, the length of the second stirring digging tooth is matched with the included angle of the outer frame digging blade 34, and the overlapping part of the area swept by the second stirring digging tooth 341 on the left outer frame digging blade and the right outer frame digging blade (34) in the rotating process is met.

As shown in fig. 5, when the inner shaft tunneling blade 331 is combined with the U-shaped stirring frame 323 and the lower outer frame sheathing plate 322 into a whole, a second guniting pipe 316 is arranged below the stirring blade 311 in the first layer at the bottommost end of the inner shaft, and a second guniting hole 317 is arranged in the middle of two horizontally adjacent inner stirring blades 311. The inner shaft channel is arranged in a circular arc shape at the radial turning part towards the second guniting pipe 316 and the second guniting hole 317; the diameter of the circular arc-shaped rounding is 0.3-1.0 d _o(d_o which is the diameter of the inner shaft channel). The smooth nature of material transportation can be further guaranteed through arc transition to can further ensure smooth nature and the stability of spouting. After the U-shaped stirring frame 323 and the second digging teeth 341 are used for drilling and cutting, the stress of the soil body is released, and then the slurry is sprayed from the lower part of the inner shaft tunneling blade 331 at the bottommost end of the stirring inner shaft 31, so that the soil body slurry-eating effect is more obvious, and the stirring uniformity of the slurry soil is facilitated.

In summary, the present utility model has the advantage that the desorption bump structures are respectively disposed on the axial outer sidewall of the stirring outer frame 32, the inner stirring blade 311 and the outer stirring blade 326, so as to form a non-smooth discontinuous interface, thereby achieving the effect of drag reduction and desorption. The high-rigidity tunneling drill bit 33 and the tunneling blade are matched with the stirring soil-digging tooth, so that the whole tunneling performance of the drilling machine is good, the drilling machine can penetrate through a hard interlayer, and the application range is wider; the slurry spraying holes and slurry spraying seams 315 on the multi-layer mutual shearing stirring drill head are combined, so that liquid slurry or solid powder can be conveyed, and the multi-layer mutual shearing stirring drill head can be used alone or in combination; the form of radial gunite gap 315 solves the problem of uneven distribution of the slurry from the gunite source.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims

1. The stirring drill bit mechanism for the multilayer mutual shearing stirring pile drilling machine comprises an inner drill rod, an outer drill rod, a stirring inner shaft (31) and a stirring outer frame (32), wherein the stirring inner shaft (31) is fixedly connected with the inner drill rod; an inner shaft channel for conveying materials is arranged in the stirring inner shaft (31); the stirring outer frame (32) is fixedly connected with the outer drill rod, and the stirring inner shaft (31) is surrounded by the stirring outer frame (32); the device is characterized in that at least one group of inner stirring blade groups is arranged on the peripheral wall of the stirring inner shaft (31), each group of inner stirring blade groups comprises a plurality of inner stirring blades (311) which are distributed radially at the same or different heights, and a plurality of first desorption lugs (312) are arranged on the upper side and/or the lower side of each inner stirring blade (311); at least one group of outer stirring blade groups are arranged on the inner side wall of the stirring outer frame (32); the outer stirring vane group comprises a plurality of outer stirring vanes (326) which are distributed radially at the same or different heights, and a plurality of second desorption protrusions (327) are arranged on the upper side and/or the lower side of each outer stirring vane (326); the inner stirring blade (311) and the outer stirring blade (326) can rotate relatively and do not interfere with each other.

2. The stirring drill mechanism for a multi-layer shearing stirring pile drilling machine as claimed in claim 1, wherein a plurality of frame desorption protrusions (328) are arranged on the axial outer side wall of the stirring frame (32).

3. The stirring drill bit mechanism for the multilayer mutual shearing stirring pile drilling machine according to claim 1, wherein the inner stirring blade groups are multiple groups, the multiple groups of inner stirring blade groups are axially arranged on the peripheral wall of the stirring inner shaft (31) at intervals, the axial distance between every two adjacent inner stirring blade groups is 0.1-10 delta, and delta is the thickness of the stirring blades; the inner stirring blade (311) forms an included angle of 0-30 degrees with the horizontal direction, and the front end part of the inner stirring blade when the inner stirring blade is used for stirring and cutting soil clockwise is processed into a certain gradient, and the gradient ratio is 1:5-1:20; the outer stirring blade (326) forms an included angle of 0-30 degrees with the horizontal direction, and the front end part of the outer stirring blade when the outer stirring blade is used for stirring and cutting soil clockwise is processed into a certain gradient, and the gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; the inner stirring blade (311) and the outer stirring blade (326) have overlap lengths in the radial direction; the lap joint length is 1/10-1/5D, and D is the construction diameter of the stirring pile.

4. The stirring drill mechanism for a multi-layer shearing stirring pile drilling machine according to claim 2, wherein the stirring outer frame (32) comprises an upper outer frame sleeve plate (321), a lower outer frame sleeve plate (322) and a plurality of U-shaped stirring frames (323); the upper outer frame sleeve plate (321) is fixedly sleeved on the outer drill rod, the lower outer frame sleeve plate (322) is rotatably sleeved on the stirring inner shaft (31), and the outer peripheral walls of the upper outer frame sleeve plate (321) and the lower outer frame sleeve plate (322) are provided with a plurality of radial support plates (324) which are arranged at intervals; two side plates of each U-shaped stirring frame (323) are respectively and fixedly connected with two radial support plates (324) which are aligned up and down, and the outer stirring blades (326) are arranged on the axial inner side wall of the U-shaped stirring frame (323); the outer frame desorption lug (328) is arranged on the axial outer side wall of the U-shaped stirring frame (323).

5. The stirring drill bit mechanism for a multi-layer mutual shearing stirring pile drilling machine according to claim 1, which is characterized by comprising a plurality of outer frame tunneling blades (34); the plurality of outer frame tunneling blades (34) are arranged at intervals at the lower end of the stirring outer frame (32); each outer frame tunneling blade (34) forms an included angle of 0-30 degrees with the horizontal direction; the front end part of the soil body is processed into a certain gradient when the soil body is cut by clockwise downward stirring, and the gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; second stirring digging teeth (341) are arranged at the gradient of the front end of the upper surface of the outer frame digging blade (34) at a certain interval along the radial direction; the second stirring digging tooth (341) forms an included angle of 0-30 degrees with the radial long side of the outer frame digging blade (34), the length of the second stirring digging tooth is matched with the included angle of the outer frame digging blade (34), and the overlapping part of the area swept by the second stirring digging tooth (341) on the left outer frame digging blade (34) and the right outer frame digging blade in the rotating process is met.

6. The stirring drill bit mechanism for the multilayer mutual shearing stirring pile drilling machine according to claim 5, wherein a second guniting pipe (316) is arranged below the stirring blade (311) in the first layer at the bottommost end of the stirring inner shaft (31), a second guniting hole (317) is arranged at the middle position of the stirring blades (311) in two horizontally adjacent inner shafts, and a second plug is detachably connected to the second guniting hole (317).

7. A stirring bit mechanism for a multi-layer mutual shearing stirring pile drilling machine as defined in claim 1, further comprising a tunneling bit (33); the tunneling drill bit (33) is fixedly connected to the lower end of the stirring inner shaft (31); a plurality of inner shaft tunneling blades (331) are radially arranged on the tunneling drill bit (33) at intervals; each inner shaft tunneling blade (331) forms an included angle of 0-30 degrees with the horizontal direction; the front end part of the soil body is processed into a certain gradient when the soil body is cut by clockwise downward stirring, and the gradient is wedge-shaped, and the gradient ratio is 1:5-1:20; first stirring digging teeth (332) are arranged at the gradient of the front end of the upper surface of the inner shaft digging blade (331) at a certain interval along the radial direction; the first stirring digging tooth (332) forms an included angle of 0-30 degrees with the radial long side of the inner shaft digging blade (331), the length of the first stirring digging tooth is matched with the included angle of the inner shaft digging blade (331), and the overlapping part of the area swept by the first stirring digging tooth (332) on the left inner shaft digging blade (331) and the right inner shaft digging blade (331) in the rotating process is met; the included angle between the first stirring digging tooth (332) and the axial direction of the stirring inner shaft (31) is 5-35 degrees, and the first stirring digging tooth is arranged towards the center direction of the stirring inner shaft (31).

8. A stirring bit mechanism for a multi-layer mutual shearing stirring pile drilling machine as defined in claim 7, wherein a first slurry spraying hole (313) is formed on the stirring inner shaft (31) and positioned in a direction perpendicular to the inner shaft driving blade (331); a first plug is detachably connected to the first guniting hole (313); a first guniting pipe (314) is arranged below the inner shaft tunneling blade (331) along the radial direction; the outer wall of the first guniting pipe (314) is provided with a guniting seam (315) communicated with the interior of the first guniting pipe (314).

9. The stirring bit mechanism for a multi-layer mutual shearing stirring pile drilling machine as defined in claim 8, wherein said inner shaft passage is provided in a circular arc shape at a radial turn toward said first guniting hole (313) and guniting slit (315); the diameter of the circular arc-shaped rounding is 1/3-1.0do, and do is the diameter of the inner shaft channel.

10. The stirring drill bit mechanism for a multi-layer shearing stirring pile drilling machine as claimed in claim 8, wherein the grouting slits (315) are arranged in different widths along the radial direction, and the slotted sectional areas of the grouting slits (315) are matched with the corresponding sectional areas of the material conveying channels and the slurry conveying pressure.