Multi-shaft multi-layer mutual shearing stirring drilling tool and using method

Abstract

The invention discloses a multi-shaft multi-layer mutual-shearing stirring drilling tool and a using method, and relates to the technical field of rock-soil construction mechanical equipment, the multi-shaft multi-layer mutual-shearing stirring drilling tool comprises a power head, a drill rod, a multi-layer mutual-shearing stirring drilling tool, a material conveying channel and a material discharging channel opening; the multi-layer mutual shearing stirring drilling tool comprises inner rod stirring wings, outer rod frame type stirring wings and digging and cutting wings, the power head drives the multiple outer drill rods through the synchronizing device to drive the adjacent outer rod frame type stirring wings and digging and cutting wings to rotate at the same rotating speed in the opposite directions, and the inner rod stirring wings rotate in the opposite directions along with the inner drill rods and the outer drill rods. The sum of the radiuses of the rotation track circles of the outer rod frame type stirring wings on the adjacent multi-layer mutual shearing stirring drilling tools is larger than the distance between the center shafts of the adjacent drilling rods. According to the method, the quality of a single pile body and the quality of a pile body in a lap joint area are guaranteed, and the formed column array type continuous wall can effectively block soil and water.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical construction machinery and equipment, and in particular to a method for using a multi-axis multi-layer shearing and mixing drill. Background Art

[0002] As an economical and efficient construction technology in geotechnical engineering, column-type cement-soil continuous wall is often used in water-stop curtains, gravity retaining walls, SMW methods, etc. At present, most of the equipment used in the construction of column-type cement-soil continuous wall at home and abroad is a multi-axis unidirectional mixing drill, such as a two-, four-, and six-axis interchangeable cement-soil mixing pile device published in CN203080512U. Each mixing shaft is a unidirectional mixing shaft, which is mainly formed by overlapping the mixing wings on adjacent mixing shafts by horizontally staggered settings, thereby forming a continuous mixing pile wall. After verification by domestic and foreign markets, the bidirectional mixing pile technology can significantly improve the uniformity and strength of the mixing pile compared with the unidirectional mixing pile, especially the pile body quality of the multi-layer mutual shearing type mixing pile is significantly improved. However, when this mixing method is used for multi-axis mixing applications, the mixing wing assemblies on the adjacent mixing shafts will interfere seriously, resulting in technical difficulties in the overlap between the piles. A multi-axis bidirectional mixing pile drilling rig disclosed in CN116180723A needs to set a certain height difference when forming a mixing continuous wall, and the drill bit is completely misaligned to solve this problem. This method solves the problem of overlapping adjacent piles to a certain extent, but the adjacent mixing piles formed are of different lengths, which will cause the reinforcement depth to be partially insufficient or partially overlong. A multi-axis multi-layer mutual shearing mixing drill and its use method disclosed in CN118360942B, although it solves the above problems to a certain extent, when the diameter of the mixing pile is small, the outer shear wing set to ensure the overlap width will cause the inner rod mixing wing and the inner shear wing to be too short, thereby affecting the internal shearing effect. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a multi-axis, multi-layer, shear-mixing drill and a method for using the same, which has a better internal shear effect, thereby making the overall mixing more uniform, ensuring the quality of the pile body of a single pile and the pile body in the overlapping area, and the formed column-type continuous wall can effectively retain soil and water.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: On one hand, the present invention provides a multi-axis multi-layer shearing and stirring drilling tool, comprising a power head, at least two drill rods and a multi-layer shearing and stirring drill bit; the drill rod is provided with a material conveying channel and at least one material discharge channel opening; The drill rod comprises an outer drill rod and an inner drill rod, the material delivery channel is arranged inside the inner drill rod, and the power head is used to drive the outer drill rod and the inner drill rod to rotate in opposite directions; The multi-layer mutual shear stirring drill bit comprises an inner rod stirring wing, an outer rod frame stirring wing and a cutting wing; the inner rod stirring wing is arranged on the side wall of the inner drill rod, and the inner rod stirring wing and the inner drill rod can rotate simultaneously; One end of the outer rod frame type stirring wing is fixedly connected to the outer drill rod, and the other end is rotatably connected to the inner drill rod, and the inner rod stirring wing and the outer rod frame type stirring wing do not interfere with each other when rotating; One or more of the discharge channel openings are located on the side wall of the inner drill rod and are connected to the corresponding feed channel, and the excavation wing is arranged at the end of the inner drill rod; The sum of the radii of the rotation trajectories of the outer rod frame-type stirring wings on adjacent multi-layer shearing stirring drill bits is greater than the distance between the center axes of adjacent drill rods.

[0005] Furthermore, the initial installation orientations of the outer rod frame type stirring wings on the adjacent multi-layer shearing stirring drill bits should be rotated 0 to 180 degrees, and the adjacent outer rod frame type stirring wings rotate in opposite directions during working rotation.

[0006] Furthermore, the power head drives the multiple outer drill rods to rotate at the same speed through a synchronization device.

[0007] Another aspect of the present invention provides a method for using a multi-axis multi-layer shearing and stirring drill, which is applied to the multi-axis multi-layer shearing and stirring drill mentioned above, and comprises the following steps: S1. Set the rotation speed of the outer drill rod and the inner drill rod, start the power head to drive the multi-layer mutual shearing and stirring drill bit to rotate, and check whether the inside of the multi-layer mutual shearing and stirring drill bit and the adjacent multi-layer mutual shearing and stirring drill bits are operating normally; S2. When the inner part of the multi-layer mutual shearing mixing drill bit and the interlaced mutual shearing of the adjacent multi-layer mutual shearing mixing drill bits are normal, start the feeding background, feed the material through the feeding channel, and the solidified material is sprayed out through the discharge channel through the feeding channel. Check whether the discharge of the discharge channel is unobstructed, and adjust the spray flow rate of the discharge channel to the design value; S3, the multi-layer mutual shearing mixing drill bit sinks and mixes the soil according to the designed construction parameters, and at the same time, the material ejected from the discharge channel is mixed with the soil to form cement soil. The multi-layer mutual shearing mixing drill bit continues to sink until the bottom of the drill tool reaches the designed elevation of the pile bottom, and then stops sinking and mixing; S4. The feeding background stops or continues feeding, the power head switches the power steering and implements multi-layer mutual shear mixing drill bit lifting and mixing according to the designed construction parameters. The cement soil is sheared and mixed again. When the drill tool is completely lifted out of the ground, the construction of a single continuous wall is completed.

[0008] Compared with the prior art, the present invention has the following advantages and beneficial effects: Compared with the prior art, by adopting this kind of drilling tool structure, the solidified material and multi-layer mutual shear mixing can cover the internal mutual shear area of ​​each drill bit and the external mutual shear mixing overlap area, ensuring the quality of the single multi-layer mutual shear mixing pile body and the pile body in the overlap area. The column-type continuous wall formed can effectively achieve soil and water retaining functions. The bottom elevations of the single multi-layer mutual shear mixing piles in a single continuous wall are equal, and a continuous wall of equal height can be formed. Water leakage at the bottom of the wall will not occur due to insufficient reinforcement depth of individual single piles. At the same time, the technical problems of overlapping width of adjacent piles and ensuring pile diameter are solved. It also solves the problem of too short inner rod mixing wings and inner shear wing blades in order to ensure the overlap width, and the drill bit can be designed more reasonably. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a two-axis multi-layer shearing and stirring drill tool of the present invention; Figure 2 for Figure 1 A top view of the multi-layer shear mixing drill bit structure; Figure 3 This is a schematic structural diagram of a second two-axis multi-layer shearing and stirring drill tool of the present invention; Figure 4 for Figure 3 A top view of the multi-layer shear mixing drill bit structure; Figure 5 It is a schematic diagram of a top view of a continuous wall of a two-axis multi-layer shear mixing construction mixing pile according to the present invention; Figure 6 It is a structural schematic diagram of a three-axis multi-layer shearing and stirring drill tool of the present invention; Figure 7 for Figure 6 A top view of the multi-layer shear mixing drill bit structure; Figure 8 It is a schematic diagram of a top view of a continuous wall portion of a three-axis multi-layer mutual shear mixing construction mixing pile according to the present invention; Fig. 9 It is a structural schematic diagram of the straight-line four-axis multi-layer shearing and stirring drill tool of the present invention; Fig.10 for Fig. 9 A top view of the multi-layer shear mixing drill bit structure; Fig.11 It is a schematic diagram of a top view of a continuous wall of mixing piles constructed by a four-axis multi-layer mutual shear mixing method according to the present invention; Fig.12 It is a structural schematic diagram of a straight-line five-axis multi-layer shearing and stirring drill tool of the present invention; Fig.13 for Fig.12 A top view of the multi-layer shear mixing drill bit structure; Fig.14 It is a schematic diagram of a top view of a continuous wall of mixing piles constructed by five-axis multi-layer mutual shear mixing according to the present invention; Fig.15 It is a top view schematic diagram of a square four-axis multi-layer and multi-layer shearing and stirring drill bit structure of the present invention; Fig.16 It is a schematic diagram of a top view of a continuous wall portion of a square four-axis multi-layer mutual shear mixing construction mixing pile according to the present invention.

[0010] Parts names and reference numbers: 1-power head, 2-drill rod, 201-external drill rod, 202-inner drill rod, 3-multi-layer shear mixing drill bit, 301-inner rod mixing wing; 302-outer rod frame type mixing wing; 303-digging wing, 4-feeding channel, 5-discharging channel opening. DETAILED DESCRIPTION

[0011] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0012] Embodiment 1:

[0013] As attached Figure 1-2 As shown, this embodiment provides a two-axis multi-layer mutual shearing and stirring drilling tool, including a power head 1, a drill rod 2, a multi-layer mutual shearing and stirring drill bit 3, a feeding channel 4 and a discharge channel 5; wherein, the drill rod 2 and the multi-layer mutual shearing and stirring drill bit 3 are each provided with two, the drill rod 2 includes an outer drill rod 201 and an inner drill rod 202, the two feeding channels 4 are arranged inside the inner drill rod 202, the power head 1 is used to drive the outer drill rod 201 and the inner drill rod 202 to rotate in opposite directions; the multi-layer mutual shearing and stirring drill bit 3 is provided with two, and the drill rod 2 includes an outer drill rod 201 and an inner drill rod 202. The two feeding channels 4 are arranged inside the inner drill rod 202, and the power head 1 is used to drive the outer drill rod 201 and the inner drill rod 202 to rotate in opposite directions; The drill bit 3 includes an inner rod stirring wing 301, a symmetrically arranged outer rod frame stirring wing 302 and a digging wing 303; the inner rod stirring wing 301 is arranged on the side wall of the inner drill rod 202, and the inner rod stirring wing 301 and the inner drill rod 202 can rotate simultaneously, one end of the outer rod frame stirring wing 302 is fixedly connected to the outer drill rod 201, and the other end is rotatably connected to the inner drill rod 202, and the inner rod stirring wing 301 and the outer rod frame stirring wing 302 do not interfere with each other when rotating.

[0014] Two discharge channel openings 5 ​​are located on the side wall of the inner drill rod 202. The discharge channel openings 5 ​​are both circular holes on the side wall of the inner drill rod 202. One of them is located on the side wall of the inner drill rod 202 close to the uppermost inner rod stirring wing 301, and the other is located on the side wall of the inner drill rod 202 close to the bottom surface of the digging wing 303. Each of them is connected to the corresponding material conveying channel 4. The digging wing 303 is separately arranged at the end of the inner drill rod 202. The sum of the radii of the rotation trajectories of the outer rod frame type stirring wings 302 on the adjacent multi-layer shearing stirring drill bits 3 is greater than the distance between the center axes of the adjacent drill rods 2 .

[0015] By adopting this drilling tool structure, the mixing can cover the internal shearing area of ​​each drill bit and the external overlapping area, ensuring the quality of the single pile body and the overlapping area. The column-type continuous wall formed can effectively retain soil and water. The bottom elevations of the individual mixing piles in a single continuous wall are completely equal, forming a continuous wall of equal height, and there will be no leakage of soil or water at the bottom of the wall due to insufficient reinforcement depth of some single piles.

[0016] The outer rod frame type stirring wings 302 and the excavation wings 303 on the adjacent multi-layer shearing stirring drill bits 3 are initially installed with their orientations rotated 90 degrees apart from each other, and the two adjacent outer rod frame type stirring wings 302 rotate in opposite directions during operation.

[0017] The power head 1 drives the two outer drill rods 201 to rotate in opposite directions at the same speed through a synchronization device (such as a gear), and each inner drill rod rotates in the opposite direction to its own outer drill rod at another same speed.

[0018] By adopting this synchronous drilling tool structure, the adjacent outer rod frame type stirring wings 302 and excavation wings 303 are prevented from rotating and interfering with each other, which not only ensures that the structural design of the shearing area inside each drill bit is not affected and the mixing quality is guaranteed, but also ensures that the two piles are effectively overlapped and fully mixed, and the column-type continuous wall formed can effectively retain soil and water. The bottom elevations of the individual stirring piles in a single continuous wall are completely equal, and a continuous wall of equal height can be formed, and there will be no leakage of soil and water at the bottom of the wall caused by insufficient reinforcement depth of some single piles.

[0019] According to the above structural and functional characteristics, combined with the needs of actual projects, a multi-axis multi-layer mutual shear mixing drill and a specific form of a method of using the same can be set to odd axes and even axes, with odd axes being 3 axes, 5 axes, 7 axes, 9 axes, etc., and even axes being 2 axes, 4 axes, 6 axes, 8 axes, etc. The multi-axis can be arranged in a straight line or in multiple rows, and the mixing piles formed by the multi-layer mutual shear mixing drill bits on adjacent drill rods are overlapped.

[0020] A method for using a two-axis multi-layer shearing and stirring drilling tool comprises the following steps: S1, setting the rotation speed of the outer drill rod 201 and the inner drill rod 202, starting the power head 1 to drive the multi-layer mutual shearing and stirring drill bit 3 to rotate, and checking whether the inside of the multi-layer mutual shearing and stirring drill bit 3 and the adjacent multi-layer mutual shearing and stirring drill bits 3 are operating normally; S2. When the inner part of the multi-layer mutual shearing stirring drill bit 3 and the interlaced mutual shearing of the adjacent multi-layer mutual shearing stirring drill bits 3 are normal, the feeding background is started, and the material is fed through the feeding channel 4. The solidified material is sprayed out through the discharge channel port 5 through the feeding channel 4. Check whether the discharge of the discharge channel port 5 is unobstructed, and adjust the spraying flow rate of the discharge channel port 5 to the design value; S3, the multi-layer mutual shearing mixing drill bit 3 sinks and mixes the soil according to the designed construction parameters, and at the same time only supplies the lower discharge channel 5 to spray the material and mix it with the soil to form cement soil. The multi-layer mutual shearing mixing drill bit 3 continues to sink until the bottom of the drill tool reaches the designed elevation of the pile bottom, and then stops sinking and mixing; S4, stop feeding the lower discharge channel 5, start feeding the upper discharge channel 5, switch the power steering of the power head 1 and implement the multi-layer mutual shearing and mixing drill bit 3 to lift and mix according to the designed construction, the cement soil is sheared and mixed again, and when the drill tool is completely lifted out of the ground, the construction of the single continuous wall is completed.

[0021] Embodiment 2:

[0022] like Figure 3-5 As shown, this embodiment is a retaining structure using grid-type gravity cement soil retaining continuous wall technology, and the retaining wall construction process adopts a two-axis multi-layer mutual shear wet spraying mixing process. Two overlapping mixing piles (one section) are injected at one time. The diameter φ of a single mixing pile is 1000mm, and the overlap distance H between piles is 300mm. The overlap between sections is also 300mm. The center distance between the left and right drill rods of the mixing drill is 700mm.

[0023] The difference from the first embodiment is that the two-axis multi-layer shearing stirring drill in the second embodiment is provided with a feeding channel 4 and a corresponding discharge channel opening 5. The discharge channel opening is constructed as a slotted extension pipe. By connecting with the feeding channel, the slurry can be directly led to the pile diameter range. This structure can better distribute the slurry so that it is evenly distributed inside the pile body. The outer rod frame type stirring wings 302 and the excavation wings 303 on the adjacent multi-layer shearing stirring drill bits 3 are initially installed with an angle of 180 degrees. After starting, they rotate at the same speed but in different directions to achieve an effective overlap effect without mutual interference.

[0024] The sum of the radii of the rotational trajectories of the outer rod frame type stirring wings 302 on the adjacent multi-layer shearing stirring drill bits 3 is 1000 mm, which is greater than the 700 mm spacing between the center axes of the adjacent drill rods 2 .

[0025] The method for using the two-axis multi-layer shearing mixing drill to construct a continuous mixing pile wall comprises the following steps: S1, setting the rotation speed of the outer drill rod 201 and the inner drill rod 202, starting the power head 1 to drive the multi-layer mutual shearing and stirring drill bit 3 to rotate, and checking whether the inside of the multi-layer mutual shearing and stirring drill bit 3 and the adjacent multi-layer mutual shearing and stirring drill bits 3 are operating normally; S2. When the inner part of the multi-layer mutual shearing stirring drill bit 3 and the interlaced mutual shearing of the adjacent multi-layer mutual shearing stirring drill bits 3 are normal, the feeding background is started, and the material is fed through the feeding channel 4. The solidified material is sprayed out through the discharge channel port 5 through the feeding channel 4. Check whether the discharge of the discharge channel port 5 is unobstructed, and adjust the spraying flow rate of the discharge channel port 5 to the design value; S3, the multi-layer mutual shearing mixing drill bit 3 sinks and mixes the soil according to the designed construction parameters, and at the same time, the material ejected from the discharge channel 5 is mixed with the soil to form cement soil. The multi-layer mutual shearing mixing drill bit 3 continues to sink until the bottom of the drill tool reaches the designed elevation of the pile bottom, and then stops sinking and mixing; S4, the feeding background stops feeding, the power head 1 switches the power steering and implements the multi-layer mutual shear mixing drill bit 3 lifting and mixing according to the designed construction parameters. The cement soil is sheared and mixed again. When the drill tool is completely lifted out of the ground, the construction of a single continuous wall is completed.

[0026] S5, the mixing pile machine is moved, and the center axis of the drill bit is aligned with the next adjacent pile position, so as to ensure that the center distance between the two overlapping piles in the two adjacent piles meets the design requirements, and the above steps S2-S4 are repeated to complete the mixing pile construction; S6. Repeat the above steps S5 and S2-S4 until the grid-type cement soil continuous wall is constructed.

[0027] Embodiment three:

[0028] As attached Figure 6-8 As shown, the background of this embodiment is that the foundation pit design adopts SMW continuous wall technology as a two-in-one structure of water stop and retaining. The continuous wall construction process adopts a three-axis multi-layer shear mixing process. The center distance between adjacent drill rods is 750mm. Three overlapping mixing piles are driven at one time. The diameter φ of a single pile is 1000mm. The overlap distance H between piles is 250mm, and the overlap between spans is also 250mm. The mixing piles are implanted with steel in the form of "inserting two and jumping one" to increase the bending stiffness of the continuous wall.

[0029] As attached Figure 6-8As shown, in this embodiment, a three-axis multi-layer mutual shearing and stirring drilling tool and a method of using the same are provided, including a power head 1, a drill rod 2, a multi-layer mutual shearing and stirring drill bit 3, a feeding channel 4 and a discharge channel 5; wherein the drill rod 2 and the multi-layer mutual shearing and stirring drill bit 3 are each provided with three, the drill rod 2 includes an outer drill rod 201 and an inner drill rod 202, two feeding channels 4 are provided inside the inner drill rod 202, the power head 1 is used to drive the outer drill rod 201 and the inner drill rod 202 to rotate in opposite directions; the multi-layer mutual shearing and stirring drill bit 3 It includes an inner rod stirring wing 301, three outer rod frame stirring wings 302 arranged at an angle of 120°, and symmetrically arranged excavation wings 303; the inner rod stirring wing 301 is arranged on the side wall of the inner drill rod 202, and the inner rod stirring wing 301 and the inner drill rod 202 can rotate simultaneously, one end of the outer rod frame stirring wing 302 is fixedly connected to the outer drill rod 201, and the other end is rotatably connected to the inner drill rod 202, and the inner rod stirring wing 301 and the outer rod frame stirring wing 302 do not interfere with each other when rotating.

[0030] The discharge channel opening 5 is located on the side wall of the inner drill rod 202. The discharge channel opening 5 is constructed as a slotted extension pipe, which is arranged parallel to the bottom of the digging wing 303 and is connected to the material conveying channel 4. The digging wing 303 is separately arranged at the end of the inner drill rod 202. The sum of the radii of the rotational trajectories of the outer rod frame type stirring wings 302 on the adjacent multi-layer shearing stirring drill bits 3 is 1000 mm, which is greater than the distance between the center axes of the adjacent drill rods 2 of 750 mm.

[0031] The outer rod frame type stirring wings 302 and the excavating wings 303 on the adjacent multi-layer mutual shear stirring drill bits 3 are initially installed with their orientations rotated and staggered by 120°.

[0032] The power head 1 drives the three outer drill rods 201 to rotate at the same speed in adjacent counter-rotating directions through a synchronization device (such as a gear), and each inner drill rod rotates at another same speed in the opposite direction to the outer drill rod.

[0033] By adopting this synchronous drilling tool structure, the adjacent outer rod frame type stirring wings 302 and excavation wings 303 are prevented from rotating and interfering with each other, which not only ensures that the structural design of the shearing area inside each drill bit is not affected and the mixing quality is guaranteed, but also ensures that the two piles are effectively overlapped and fully mixed, and the column-type continuous wall formed can effectively retain soil and water. The bottom elevations of the individual stirring piles in a single continuous wall are completely equal, and a continuous wall of equal height can be formed, and there will be no leakage of soil and water at the bottom of the wall caused by insufficient reinforcement depth of some single piles.

[0034] A method for using a three-axis multi-layer shearing and mixing drilling tool comprises the following steps: S1, setting the rotation speed of the outer drill rod 201 and the inner drill rod 202, starting the power head 1 to drive the multi-layer mutual shearing and stirring drill bit 3 to rotate, and checking whether the inside of the multi-layer mutual shearing and stirring drill bit 3 and the adjacent multi-layer mutual shearing and stirring drill bits 3 are operating normally; S2. When the inner part of the multi-layer mutual shearing stirring drill bit 3 and the interlaced mutual shearing of the adjacent multi-layer mutual shearing stirring drill bits 3 are normal, the feeding background is started, and the material is fed through the feeding channel 4. The solidified material is sprayed out through the discharge channel port 5 through the feeding channel 4. Check whether the discharge of the discharge channel port 5 is unobstructed, and adjust the spraying flow rate of the discharge channel port 5 to the design value; S3, the multi-layer mutual shearing mixing drill bit 3 sinks and mixes the soil according to the designed construction parameters, and at the same time, the material ejected from the discharge channel 5 is mixed with the soil to form cement soil. The multi-layer mutual shearing mixing drill bit 3 continues to sink until the bottom of the drill tool reaches the designed elevation of the pile bottom, and then stops sinking and mixing; S4, the feeding background stops feeding, the power head 1 switches the power steering and implements the multi-layer mutual shear mixing drill bit 3 lifting and mixing according to the designed construction parameters. The cement soil is sheared and mixed again. When the drill tool is completely lifted out of the ground, the construction of a single continuous wall is completed.

[0035] S5. Move the pile mixing machine and align the center axis of the drill bit with the next designed pile position. The net distance from the first pile is the diameter of a single pile minus twice the overlap distance. Ensure that the overlap of the third pile to be constructed meets the design requirements. Repeat the above steps S2 to S4 to complete the construction of the second pile mixing machine.

[0036] S6. The pile mixing machine continues to move to the middle position between the first and second piles, and repeats the above steps S2 to S4 to complete the overlapping of the third pile with the first and second piles.

[0037] S7, the mixing pile continues to move to the fourth and fifth positions in sequence, and so on, repeating the above steps S2 to S4 until the completion of Figure 8 The construction of the grid-type cement-soil continuous wall is shown.

[0038] Embodiment 4:

[0039] As attached Figure 9-10As shown, the background of this embodiment is that a foundation pit is located in silty soft soil with a high water content. The design adopts cantilever double-row piles as the retaining support structure. The main process is to implant two rows of precast concrete piles or steel pipe piles in three rows of dry-sprayed cement soil mixing pile grids (i.e., mixing pile continuous walls). The mixing pile construction method is "sleeve one hole", and the concrete precast pile or steel pipe pile construction method is "insert one and jump one". The diameter φ of a single mixing pile is 1000mm, and the diameter of the concrete precast pile or steel pipe pile is 500mm. The mixing pile grid construction process adopts a four-axis multi-layer mutual shear mixing process. Four overlapping mixing piles are injected at one time. The overlap distance H between the piles is 250mm, and the overlap between the spans is also 250mm. The diameter of the drill rod in the mixing pile is 180mm, and the center distance between adjacent drill rods is 750mm.

[0040] In this embodiment, a four-axis multi-layer mutual shearing and stirring drilling tool and a method of using the same include a power head 1, a drill rod 2, a multi-layer mutual shearing and stirring drill bit 3, a feed channel 4, and a discharge channel opening 5; wherein the drill rod 2 and the multi-layer mutual shearing and stirring drill bit 3 are each provided with four, the drill rod 2 includes an outer drill rod 201 and an inner drill rod 202, a feed channel 4 is provided inside the inner drill rod 202, the power head 1 is used to drive the outer drill rod 201 and the inner drill rod 202 to rotate in opposite directions; the multi-layer mutual shearing and stirring drill bit 3 includes an inner The inner rod stirring wing 301, the symmetrically arranged outer rod frame stirring wing 302 and the excavation wing 303 which is integrated with part of the structure thereof; the inner rod stirring wing 301 is arranged on the side wall of the inner drill rod 202, and the inner rod stirring wing 301 and the inner drill rod 202 can rotate simultaneously, one end of the outer rod frame stirring wing 302 is fixedly connected to the outer drill rod 201, and the other end is rotatably connected to the inner drill rod 202, and the inner rod stirring wing 301 and the outer rod frame stirring wing 302 do not interfere with each other when rotating.

[0041] The discharge channel opening 5 is located on the side wall of the inner drill rod 202. The discharge channel opening 5 is in the form of a circular hole on the side wall of the inner drill rod 202 and is connected to the feed channel 4. The sum of the radii of the rotation trajectories of the outer rod frame type stirring wings 302 on the adjacent multi-layer shearing stirring drill bits 3 is greater than the distance between the center axes of the adjacent drill rods 2 .

[0042] The outer rod frame stirring wings 302 and the excavation wings 303 on the adjacent multi-layer shear stirring drill bits 3 are initially installed with an angle of rotation of 90° relative to each other. The power head 1 drives the two outer drill rods 201 to rotate in opposite directions at the same speed through a synchronization device (such as gears), and each inner drill rod rotates in the opposite direction to its own outer drill rod 201 at another same speed.

[0043] By adopting this synchronous drilling tool structure, the adjacent outer rod frame type stirring wings 302 and excavation wings 303 are prevented from rotating and interfering with each other, which not only ensures that the structural design of the shearing area inside each drill bit is not affected and the mixing quality is guaranteed, but also ensures that the two piles are effectively overlapped and fully mixed, and the column-type continuous wall formed can effectively retain soil and water. The bottom elevations of the individual stirring piles in a single continuous wall are completely equal, and a continuous wall of equal height can be formed, and there will be no leakage of soil and water at the bottom of the wall caused by insufficient reinforcement depth of some single piles.

[0044] A method for using a four-axis multi-layer shearing and mixing drilling tool comprises the following steps: S1, setting the rotation speed of the outer drill rod 201 and the inner drill rod 202, starting the power head 1 to drive the multi-layer mutual shearing and stirring drill bit 3 to rotate, and checking whether the inside of the multi-layer mutual shearing and stirring drill bit 3 and the adjacent multi-layer mutual shearing and stirring drill bits 3 are operating normally; S2. When the inner part of the multi-layer mutual shearing stirring drill bit 3 and the interlaced mutual shearing of the adjacent multi-layer mutual shearing stirring drill bits 3 are normal, the feeding background is started, and the material is fed through the feeding channel 4. The solidified material is sprayed out through the discharge channel port 5 through the feeding channel 4. Check whether the discharge of the discharge channel port 5 is unobstructed, and adjust the spraying flow rate of the discharge channel port 5 to the design value; S3, the multi-layer mutual shearing mixing drill bit 3 sinks and mixes the soil according to the designed construction parameters, and at the same time, the material ejected from the discharge channel 5 is mixed with the soil to form cement soil. The multi-layer mutual shearing mixing drill bit 3 continues to sink until the bottom of the drill tool reaches the designed elevation of the pile bottom, and then stops sinking and mixing; S4, the feeding background stops feeding, the power head 1 switches the power steering and implements the multi-layer mutual shear mixing drill bit 3 lifting and mixing according to the designed construction parameters. The cement soil is sheared and mixed again. When the drill tool is completely lifted out of the ground, the construction of a single continuous wall is completed.

[0045] S5, the mixing pile machine is moved, the center axis of the drill rod at the edge of the drill bit is aligned with the center of the edge pile of the first continuous wall, a pile is sleeved, and the above steps S2-S4 are repeated to complete the construction of the second mixing pile; S6. The mixing piles continue to be moved to the third position in sequence to complete the sleeve construction of the third pile, and the above steps S2-S4 are repeated in this way until the grid-type cement soil continuous wall is constructed.

[0046] Embodiment five:

[0047] As attached Figure 11-13 As shown, the background of this embodiment is that a water system dam structure design adopts five-axis mixing piles as an anti-seepage and water-stopping curtain, the mixing process is wet spraying, the construction method is "one hole socket", the diameter φ of a single mixing pile is 800mm, five overlapping mixing piles are driven at one time, the overlapping distance H between the piles is 250mm, the diameter of the drill rod in the mixing pile is 180mm, and the center distance between adjacent drill rods is 550mm.

[0048] As attached Figure 1-2 As shown, a five-axis multi-layer mutual shearing mixing drill tool for mixing continuous wall construction includes a power head 1, a drill rod 2, a multi-layer mutual shearing mixing drill bit 3, a material feeding channel 4 and a material discharge channel opening 5; wherein, the drill rod 2 and the multi-layer mutual shearing mixing drill bit 3 are each provided with 5, the drill rod 2 includes an outer drill rod 201 and an inner drill rod 202, a single material feeding channel 4 is arranged inside the inner drill rod 202, and the power head 1 is used to drive the outer drill rod 201 and the inner drill rod 202 to rotate in opposite directions; the multi-layer mutual shearing mixing drill bit 3 comprises an inner rod stirring wing 301, two symmetrically arranged outer rod frame stirring wings 302 and a symmetrically arranged excavation wing 303; the inner rod stirring wing 301 is arranged on the side wall of the inner drill rod 202, and the inner rod stirring wing 301 and the inner drill rod 202 can rotate simultaneously, one end of the outer rod frame stirring wing 302 is fixedly connected to the outer drill rod 201, and the other end is rotatably connected to the inner drill rod 202, and the inner rod stirring wing 301 and the outer rod frame stirring wing 302 do not interfere with each other when rotating.

[0049] The discharge channel opening 5 is located on the side wall of the inner drill rod 202. The discharge channel opening 5 is constructed as a slotted extension pipe, which is arranged parallel to the bottom of the digging wing 303 and is connected to the material conveying channel 4. The digging wing 303 is separately arranged at the end of the inner drill rod 202. The sum of the radii of the rotational trajectories of the outer rod frame type stirring wings 302 on the adjacent multi-layer shearing stirring drill bits 3 is 800 mm, which is greater than the distance between the center axes of the adjacent drill rods 2 of 550 mm.

[0050] The outer rod frame type stirring wings 302 and the excavation wings 303 on the adjacent multi-layer shearing stirring drill bits 3 are initially installed with their orientations rotated 90 degrees apart from each other.

[0051] The power head 1 drives the five outer drill rods 201 to rotate at the same speed in adjacent counter-rotating directions through a synchronization device (such as a gear), and each inner drill rod rotates at another same speed in the opposite direction to the outer drill rod.

[0052] By adopting this synchronous drilling tool structure, the adjacent outer rod frame type stirring wings 302 and excavation wings 303 are prevented from rotating and interfering with each other, which not only ensures that the structural design of the shearing area inside each drill bit is not affected and the mixing quality is guaranteed, but also ensures that the two piles are effectively overlapped and fully mixed, and the column-type continuous wall formed can effectively retain soil and water. The bottom elevations of the individual stirring piles in a single continuous wall are completely equal, and a continuous wall of equal height can be formed. There will be no leakage of soil and water at the bottom of the wall due to insufficient reinforcement depth of some single piles, and a large number of piles can be formed at one time, with high work efficiency.

[0053] A method for using a five-axis multi-layer shearing and mixing drilling tool comprises the following steps: S1, setting the rotation speed of the outer drill rod 201 and the inner drill rod 202, starting the power head 1 to drive the multi-layer mutual shearing and stirring drill bit 3 to rotate, and checking whether the inside of the multi-layer mutual shearing and stirring drill bit 3 and the adjacent multi-layer mutual shearing and stirring drill bits 3 are operating normally; S2. When the inner part of the multi-layer mutual shearing stirring drill bit 3 and the interlaced mutual shearing of the adjacent multi-layer mutual shearing stirring drill bits 3 are normal, the feeding background is started, and the material is fed through the feeding channel 4. The solidified material is sprayed out through the discharge channel port 5 through the feeding channel 4. Check whether the discharge of the discharge channel port 5 is unobstructed, and adjust the spraying flow rate of the discharge channel port 5 to the design value; S3, the multi-layer mutual shearing mixing drill bit 3 sinks and mixes the soil according to the designed construction parameters, and at the same time, the material ejected from the discharge channel 5 is mixed with the soil to form cement soil. The multi-layer mutual shearing mixing drill bit 3 continues to sink until the bottom of the drill tool reaches the designed elevation of the pile bottom, and then stops sinking and mixing; S4, the feeding background stops feeding, the power head 1 switches the power steering and implements the multi-layer mutual shear mixing drill bit 3 lifting and mixing according to the designed construction parameters. The cement soil is sheared and mixed again. When the drill tool is completely lifted out of the ground, the construction of a single continuous wall is completed.

[0054] S5, the mixing pile machine is moved, the center axis of the drill rod at the edge of the drill bit is aligned with the center of the edge pile of the first continuous wall, a pile is sleeved, and the above steps S2-S4 are repeated to complete the construction of the second mixing pile; S6. The mixing piles continue to be moved to the third position in sequence to complete the sleeve construction of the third pile, and the above steps S2-S4 are repeated in this way until the linear cement soil continuous wall is constructed.

[0055] Embodiment six:

[0056] As attached Fig.15 , Fig.16 As shown, in the background of this embodiment, the revetments on both sides of a river channel of a certain water system adopt a cantilever retaining wall structure, and the foundation soil below the retaining wall is silty soft soil with a high water content. In order to prevent the retaining wall structure from sliding and overturning as a whole, grid-type dry-spraying mixing piles are used to reinforce the foundation soil. The mixing piles adopt a four-axis multi-layer shear mixing process, and four overlapping mixing piles (one piece) are injected at a time. The diameter φ of a single mixing pile is 900mm, the overlapping distance H between piles is 150mm, and the overlapping distance between pieces is also 150mm. The diameter of the drill rod in the mixing pile is 180mm, and the distance between the center axes of the drill rod is 750mm.

[0057] A square-arranged four-axis multi-layer mutual shearing mixing drill tool for mixing continuous wall construction includes a power head 1, a drill rod 2, a multi-layer mutual shearing mixing drill bit 3, a material feeding channel 4 and a material discharge channel 5; wherein, the drill rod 2 and the multi-layer mutual shearing mixing drill bit 3 are each provided with four, the drill rod 2 includes an outer drill rod 201 and an inner drill rod 202, a single material feeding channel 4 is arranged inside the inner drill rod 202, and the power head 1 is used to drive the outer drill rod 201 and the inner drill rod 202 to rotate in opposite directions; the multi-layer mutual shearing mixing drill bit 3 It includes an inner rod stirring wing 301, two symmetrically arranged outer rod frame stirring wings 302 and symmetrically arranged excavation wings 303; the inner rod stirring wing 301 is arranged on the side wall of the inner drill rod 202, and the inner rod stirring wing 301 and the inner drill rod 202 can rotate simultaneously, one end of the outer rod frame stirring wing 302 is fixedly connected to the outer drill rod 201, and the other end is rotatably connected to the inner drill rod 202, and the inner rod stirring wing 301 and the outer rod frame stirring wing 302 do not interfere with each other when rotating.

[0058] The discharge channel opening 5 is located on the side wall of the inner drill rod 202. The discharge channel opening 5 is constructed as a slotted extension pipe, which is arranged parallel to the bottom of the digging wing 303 and is connected to the material conveying channel 4. The digging wing 303 is separately arranged at the end of the inner drill rod 202. The sum of the radii of the rotational trajectories of the outer rod frame type stirring wings 302 on the adjacent multi-layer shearing stirring drill bits 3 is 900 mm, which is greater than the distance between the center axes of the adjacent drill rods 2 of 750 mm.

[0059] The outer rod frame type stirring wings 302 and the excavation wings 303 on the adjacent multi-layer shearing stirring drill bits 3 are initially installed with their orientations rotated 90 degrees apart from each other.

[0060] The power head 1 drives the four outer drill rods 201 to rotate at the same speed in adjacent counter-rotating directions through a synchronization device (such as a hydraulic synchronization device), and each inner drill rod rotates at another same speed in the opposite direction to the respective outer drill rod.

[0061] By adopting this synchronous drilling tool structure, the adjacent outer rod frame type stirring wings 302 and excavation wings 303 are prevented from rotating and interfering, which not only ensures that the structural design of the shearing area inside each drill bit is not affected and the mixing quality is guaranteed, but also ensures that the two piles are effectively overlapped and fully mixed, and the column-type continuous wall formed can effectively retain soil and water. The bottom elevations of the individual stirring piles in a single continuous wall are completely equal, and a continuous wall of equal height can be formed. There will be no leakage of soil and water at the bottom of the wall caused by insufficient reinforcement depth of some single piles, and the cross-section of the piles formed at one time is large, and the work efficiency is high.

[0062] The method for using the square four-axis multi-layer mutual shear mixing drill to construct a continuous mixing pile wall includes the following steps: S1, setting the rotation speed of the outer drill rod 201 and the inner drill rod 202, starting the power head 1 to drive the multi-layer mutual shearing and stirring drill bit 3 to rotate, and checking whether the inside of the multi-layer mutual shearing and stirring drill bit 3 and the adjacent multi-layer mutual shearing and stirring drill bits 3 are operating normally; S2. When the inner part of the multi-layer mutual shearing stirring drill bit 3 and the interlaced mutual shearing of the adjacent multi-layer mutual shearing stirring drill bits 3 are normal, the feeding background is started, and the material is fed through the feeding channel 4. The solidified material is sprayed out through the discharge channel port 5 through the feeding channel 4. Check whether the discharge of the discharge channel port 5 is unobstructed, and adjust the spraying flow rate of the discharge channel port 5 to the design value; S3, the multi-layer mutual shearing mixing drill bit 3 sinks and mixes the soil according to the designed construction parameters, and at the same time, the material ejected from the discharge channel 5 is mixed with the soil to form cement soil. The multi-layer mutual shearing mixing drill bit 3 continues to sink until the bottom of the drill tool reaches the designed elevation of the pile bottom, and then stops sinking and mixing; S4, the feeding background stops feeding, the power head 1 switches the power steering and implements the multi-layer mutual shear mixing drill bit 3 lifting and mixing according to the designed construction parameters. The cement soil is sheared and mixed again. When the drill tool is completely lifted out of the ground, the construction of a single continuous wall is completed.

[0063] S5, the mixing pile machine is moved, and the center axis of the drill bit is aligned with the next adjacent pile position, so as to ensure that the center distance between the two overlapping piles in the two adjacent piles meets the design requirements, and the above steps S2-S4 are repeated to complete the construction of the second mixing pile; S6. The mixing piles continue to be moved to the third position in sequence to complete the sleeve construction of the third pile. Repeat the above steps S2-S4 in this way until the grid-type cement soil continuous wall construction is completed.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-axis multi-layer shear mixing drill, characterized in that: It comprises a power head (1), at least two drill rods (2) and a multi-layer shearing and stirring drill bit (3); the drill rod (2) is provided with a material conveying channel (4) and at least one material discharge channel opening (5); The drill rod (2) comprises an outer drill rod (201) and an inner drill rod (202); the material delivery channel (4) is arranged inside the inner drill rod (202); and the power head (1) is used to drive the outer drill rod (201) and the inner drill rod (202) to rotate in opposite directions; The multi-layer mutual shear stirring drill bit (3) comprises an inner rod stirring wing (301), an outer rod frame-type stirring wing (302) and a cutting wing (303); the inner rod stirring wing (301) is arranged on the side wall of the inner drill rod (202), and the inner rod stirring wing (301) and the inner drill rod (202) can rotate simultaneously; One end of the outer rod frame-type stirring wing (302) is fixedly connected to the outer drill rod (201), and the other end is rotatably connected to the inner drill rod (202), and the inner rod stirring wing (301) and the outer rod frame-type stirring wing (302) do not interfere with each other when rotating; One or more of the discharge channel openings (5) are located on the side wall of the inner drill rod (202) and are connected to the corresponding feed channel (4); the excavation wing (303) is arranged at the end of the inner drill rod (202); The sum of the radii of the rotational trajectories of the outer rod frame-type stirring wings (302) on adjacent multi-layer shearing stirring drill bits (3) is greater than the distance between the center axes of adjacent drill rods (2).

2. A multi-axis multi-layer shearing and stirring drill according to claim 1, characterized in that: The outer rod frame-type stirring wings (302) on the adjacent multi-layer shearing stirring drill bits (3) are rotated and staggered by 0 to 180 degrees at their initial installation positions, and the adjacent outer rod frame-type stirring wings (302) rotate in opposite directions during operation.

3. The multi-axis multi-layer shearing and stirring drilling tool according to claim 1, characterized in that: The power head (1) drives the plurality of outer drill rods (201) to rotate at the same speed through a synchronization device.

4. A method for using a multi-axis multi-layer shearing and stirring drill, applied to a multi-axis multi-layer shearing and stirring drill according to any one of claims 1 to 3, characterized in that: The steps include: S1. Set the rotation speed of the outer drill rod and the inner drill rod, start the power head to drive the multi-layer mutual shearing and stirring drill bit to rotate, and check whether the inside of the multi-layer mutual shearing and stirring drill bit and the adjacent multi-layer mutual shearing and stirring drill bits are operating normally; S2. When the inner part of the multi-layer mutual shearing mixing drill bit and the interlaced mutual shearing of the adjacent multi-layer mutual shearing mixing drill bits are normal, start the feeding background, feed the material through the feeding channel, and the solidified material is sprayed out through the discharge channel through the feeding channel. Check whether the discharge of the discharge channel is unobstructed, and adjust the spray flow rate of the discharge channel to the design value; S3, sink the drill bit to dig the soil according to the designed construction parameters, and at the same time, the material ejected from the discharge channel is mixed with the soil to form cement soil, and the drill bit continues to sink until the multi-layer shear mixing drill bit sinks into the soil for further mixing. When the bottom of the drill bit reaches the designed elevation of the pile bottom, the sinking stops; S4. The feeding background stops or continues feeding, the power head switches the power steering and lifts according to the designed construction parameters, the cement soil is mixed again, and the single continuous wall construction is completed when the drill bit is completely lifted out of the ground.

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