A large-diameter deep-mixing pile drilling tool and a mixing device

Abstract

The present application relates to the technical field of underground construction machinery and equipment, a large-diameter deep mixing pile drilling tool and mixing equipment, comprising a top joint, a main rod, a first mixing blade, a second mixing blade, a free blade, a tunneling blade and a spiral drill tip; the top joint is fixedly connected to the top of the main rod; the main rod is provided with a material conveying channel; the first mixing blade and the second mixing blade are arranged on the main rod in the axial direction of the main rod; the free blade is movably connected to the main rod; the tunneling blade is arranged at the lower part of the drilling tool; the tunneling blade is provided with a slurry conveying pipe which is in communication with the material conveying channel; the tunneling blade is provided with a slurry injection hole; and the spiral drill tip is fixedly connected to the bottom of the main rod. The present application has the advantages of preventing the solidified soil between the mixing blades from clumping and sticking, making the mixing more uniform, and improving the construction quality of the deep mixing pile.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground construction machinery and equipment, and particularly relates to a large-diameter deep mixing pile drilling tool and a mixing device. BACKGROUND

[0002] The deep mixing pile is an effective way for soft soil foundation reinforcement, cement or other new solidification materials are injected into the ground by using single-shaft or multi-shaft mixing drill, and the original soil and the solidification materials are stirred by the mixing drill, so that a series of physical and chemical reactions occur between the solidification materials and the soil, and finally a pile or wall with certain strength, good water resistance and strong anti-seepage performance is formed, which is used to improve the bearing capacity of the foundation or to isolate and store toxic and harmful substances. Based on the research in the field of deep mixing pile construction in China, the existing mixing pile drilling tool still has many structure and process problems which lead to poor pile quality, and the construction effect cannot meet the expectation. Specifically, the pile strength is uneven, the local aggregation caused by uneven spraying of the solidification material, the pile interface is not obvious, the slurry overflow is serious during the construction process, and the drill is easily stuck in the clay during the construction. SUMMARY

[0003] The present application solves the technical problems of uneven stirring and poor stirring effect of the mixing drill, and provides a large-diameter deep mixing pile drilling tool which can prevent the solidified soil between the mixing blades from sticking and sticking the drill, and also makes the stirring more uniform and improves the construction quality of the deep mixing pile.

[0004] To achieve the purpose of the present application, the following technical solutions are adopted:

[0005] A large-diameter deep mixing pile drilling tool, characterized in that it comprises a top joint, a main rod, a first mixing blade, a second mixing blade, a free blade, a digging blade and a spiral drill tip; the top joint is fixedly connected to the top of the main rod; the main rod is provided with a material conveying channel for conveying solidification materials; the first mixing blade and the second mixing blade are arranged on the main rod in the axial direction of the main rod; the free blade is movably connected to the main rod; the digging blade is arranged at the lower part of the drilling tool; the digging blade is provided with a slurry conveying pipe which is in communication with the material conveying channel; the digging blade is provided with a slurry injection hole which is in communication with the slurry conveying pipe; and the spiral drill tip is fixedly connected to the bottom of the main rod. The mixing pile drilling tool prevents the solidified soil between the mixing blades from sticking and sticking the drill, and also makes the stirring more uniform and improves the construction quality of the deep mixing pile.

[0006] As a preferred embodiment, a spiral plate is further included; the spiral plate is arranged on the outer wall of the upper part of the main rod. The spiral plate also plays the role of a baffle to a certain extent, preventing the slurry from overflowing outward along the gap between the drill rod and the soil.

[0007] As preferred, the rotation expansion angle of the spiral plate ranges from 0° to 1080°, forming one to three continuous spiral plates; the diameter of the continuous spiral plate is in the form of variable diameter, and the maximum diameter is 2 / 3 to 1 / 2 of the pile diameter; the diameter of the starting end and the end of the spiral plate gradually decreases to the outer wall of the main rod, and the pitch of the spiral plate is in the form of equal pitch. The setting of the spiral plate also plays a role of baffle to a certain extent, preventing the slurry from overflowing outward along the gap between the drill rod and the soil body; by controlling the pulling speed and rotation speed, when drilling down, the spiral plate lifts the soil body, which is released due to the increased soil pressure caused by grouting and gas injection, and when pulling up, the spiral plate can be used to extrude and compact the soil body.

[0008] As preferred, the free blade is rotatably connected to the main rod by rotating the limiting shaft sleeve, and the free blade is located between the first stirring blade and the second stirring blade; the length of the free blade is greater than the length of the first stirring blade and the second stirring blade, the edges of the free blade are sharp, and a plurality of soil dispersing plates are arranged on the free blade at equal intervals.

[0009] As preferred, the free blade is in the form of a hollow frame, the upper frame of the free blade is rotatably connected to the main rod by the first rotating limiting shaft sleeve, the lower frame of the free blade is rotatably connected to the main rod by the second rotating limiting shaft sleeve, and the first stirring blade and the second stirring blade are enclosed therein; the lower side of the upper frame of the free blade and the upper side of the lower frame of the free blade are respectively provided with a plurality of soil dispersing plates at equal intervals. The free blade does not rotate with the main rod in the soil body, but only moves up and down with the drilling tool in the vertical direction, cutting and dispersing the mixed soil between the blades in the vertical direction, and the relative movement between the soil dispersing plates and the soil dispersing teeth disperses and disrupts the mixed soil, solving the problem of soil clumping and sticking the drill.

[0010] As preferred, the rotation stirring diameter of the first stirring blade, the second stirring blade and the tunneling blade ranges from 1500 to 3000 mm, the angle between the first stirring blade, the second stirring blade and the tunneling blade and the horizontal plane ranges from 10° to 35°, and the cutting surface of the first stirring blade, the second stirring blade and the tunneling blade is sharp, the first stirring blade and the second stirring blade are divided into at least two parts in an average manner, and the tunneling blade is divided into two parts. The first stirring blade 4 and the second stirring blade 5 can select different numbers of stirring blades according to different geological conditions, and more reasonably stir the soil body; the tunneling blade 7 remains in the form of two parts, and the two parts of the tunneling blade provide more space for the broken soil body.

[0011] As preferred, a plurality of first soil body guide plates are arranged on the first stirring blade at equal intervals; a plurality of second soil body guide plates are arranged on the second stirring blade at equal intervals, and the first soil body guide plates and the second soil body guide plates are arranged in pairs; a plurality of soil body dispersing teeth are arranged on the other side of the first stirring blade and the second soil body guide plates at equal intervals; the acute angle between the first soil body guide plate and the long side of the first stirring blade is 45°-75°; the acute angle between the second soil body guide plate and the long side of the second stirring blade is 45°-75°; the soil body guide plates on the same blade are arranged in single row or double row with gaps; the first soil body guide plate and the second soil body guide plate are arranged in opposite directions; the height of the first soil body guide plate and the second soil body guide plate is 50-100 mm; the end of the first stirring blade and the second stirring blade is provided with an end cutting plate, the soil cutting surface of the end cutting plate is sharp, and a plurality of alloy particles are arranged on the outer surface. The soil body guide plates arranged in opposite directions can push the soil between adjacent complex stirring blades to the vicinity of the pile center and the pile periphery, so as to rub and shear the soil, and make the mixing of the solidified material and the soil more uniform.

[0012] As preferred, a plurality of cutting teeth are arranged on the tunneling blade at intervals; each cutting tooth is arranged with gaps on the radius of the circular surface formed by the rotation of the tunneling blade, the angle between the cutting tooth and the long side of the tunneling blade gradually increases with the direction away from the main rod, and the angle between the cutting tooth and the horizontal plane is consistent with the angle between the tunneling blade and the horizontal plane. The above structure ensures that the sharp edge of the cutting tooth always cuts the soil vertically, ensuring effective cutting, and the consistent angle between the cutting tooth and the horizontal plane and the tunneling blade makes the cutting of the soil by the cutting tooth and the tunneling blade more smooth.

[0013] As preferred, the shotcrete hole is arranged at the bottom of the tunneling blade and hidden in the gap between the tunneling blade and the shotcrete pipe; the shotcrete hole is in the shape of a continuous slit; the opening of the shotcrete hole gradually increases in width in the direction away from the main rod; the circular area swept by each step is consistent, and the material output of each step is consistent under the same flow; a plug screw is arranged at the end of the shotcrete pipe. The above structure can effectively prevent the shotcrete hole from being blocked as a whole, and even if a part is blocked, the solidified material sprayed by the adjacent slit can gradually break the blocked part and finally penetrate the whole shotcrete hole; the arrangement of the plug screw facilitates the disassembly and cleaning of the shotcrete pipe and the shotcrete hole.

[0014] The utility model provides a kind of stirring equipment, including active drill rod, high-pressure air pump and high-pressure grouting pump and above-mentioned large diameter deep mixing pile drill tool;The lower end of the active drill rod is connected with the top joint, and the top joint adopts internal hexagonal female joint, and the lower end of the active drill rod is fixedly connected with external hexagonal male joint, and the active drill rod and the top joint are inserted by mutual insertion and are fixed by inserting pin hole in the pin rod on the joint;The material conveying passage is connected with the material passage arranged in the active drill rod, and the power head is connected on the active drill rod;The water faucet is provided on the power head and is connected with the material conveying passage;The high-pressure air pump is connected with external gas conveying passage connection, and the high-pressure grouting pump is connected with external slurry conveying passage, and the external gas conveying passage is connected with the external slurry conveying passage by three-way joint and is connected with the water faucet.The high-pressure compressed air is added in the process of grouting, the slurry injection speed is improved, the shape of the grouting hole is reasonably arranged, the curing agent slurry is uniformly sprayed on the pile cross section, the adjacent complex stirring blade is used to rub and squeeze the mixed soil, the curing material and the soil are uniformly mixed, the free blade on the drill tool does not rotate with the drill rod during drilling and pulling, the mixed soil is vertically cut during the process, the curing soil between stirring blades is prevented from clumping and sticking, so that the stirring is more uniform, and the construction quality of deep mixing pile is improved.

[0015] In conclusion, the advantages of the present application are: ① the present application uses high-pressure compressed air to atomize the curing agent slurry, increases the injection speed, and improves the uniformity of the curing agent; ② the spiral plate on the upper part of the drill tool can effectively prevent the slurry from overflowing, and during the drilling process, it can lift the soil and reduce the ground pressure; during the pulling process, it can rotate in the opposite direction to extrude and compact the reinforced soil; ③ the grouting hole for the curing material is arranged in a stepped, triangular, or other irregular shape, and the width of the slit increases continuously in the direction away from the main rod, which can ensure that the amount of curing material sprayed at different positions on the pile cross section is consistent; at the same time, it avoids the risk of grouting hole blockage; ④ the soil guide plates are arranged in pairs on the upper and lower surfaces of the stirring blade, which realizes the reciprocating motion of the mixed soil between the blades within the radial range of the pile, and rubs, kneads, and shears the mixed soil, making the mixing of the original soil and the curing material more uniform; ⑤ the special arrangement of the cutting teeth on the drilling blade ensures that the cutting edge of the cutting teeth is always perpendicular to the soil, which can more effectively cut and loosen the original soil; ⑥ the setting of the end cutting plate makes the boundary of the pile more obvious, and the alloy particles increase the roughness of the pile, which enhances the side friction resistance; ⑦ the staggered arrangement and relative agitation of the soil dispersing plate and the soil dispersing teeth effectively solve the problem of mixed soil clumping and sticking. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the first side view of the large diameter deep mixing pile drill tool of the present application.

[0017] Figure 2 is the second side view of the large diameter deep mixing pile drill tool of the present application.

[0018] Figure 3 is the schematic diagram of cutting path of the pick in the present application.

[0019] Figure 4 is the schematic diagram of installation position of the slurry pipe in the present application.

[0020] Figure 5 is the sectional view of the structure of the slurry pipe and the slurry injection hole in the present application.

[0021] Figure 6 is the schematic diagram of the spraying path of the slurry injection hole in the present application.

[0022] Figure 7 is the schematic diagram of various forms of the slurry injection hole in the present application.

[0023] Figure 8 is the arrangement diagram of the soil flow guide plate on the stirring blade in the present application.

[0024] Figure 9 is the schematic diagram of the end cutting plate structure in the present application.

[0025] Figure 10 is the top view of the drill in the first embodiment of the present application.

[0026] Figure 11 is the schematic diagram of the curing agent delivery path of the drill in the present application.

[0027] Figure 12 is the top view of the drill in the second embodiment of the present application.

[0028] Figure 13 is the side view of the drill structure in the second embodiment of the present application.

[0029] Figure 14 is the side view of the drill structure in the third embodiment of the present application.

[0030] Figure 15 is the schematic diagram of the curing agent delivery path of the drill in the third embodiment of the present application.

[0031] Figure 16 is the top view of the drill in the third embodiment of the present application.

[0032] Figure 17 is the schematic diagram of the structure of the stirring device in the present application.

[0033] Wherein: 100, stirring pile drilling tool; 200, driving drill rod; 300, power head; 400, water faucet; 500, external slurry conveying channel; 600, external gas conveying channel; 700, high-pressure gas pump; 800, high-pressure grouting pump; 1, top joint; 2, main rod; 2-1, material conveying channel; 3, spiral plate; 3-1, wear-resistant plate; 4, first stirring blade; 4-1, first soil flow guide plate; 5, second stirring blade; 5-1, second soil flow guide plate; 6, free blade; 61, upper frame; 62, lower frame; 6-1, soil dispersing plate; 7, tunneling blade; 7-1, cutting tooth; 8, spiral drill tip; 8-1, drill tip tooth; 9, rotation limiting shaft sleeve; 9-1, first rotation limiting shaft sleeve; 9-2, second rotation limiting shaft sleeve; 10, alloy wear-resistant strip; 11, end cutting plate; 12, soil dispersing tooth; 13, grouting hole; 14, plug screw; 15, slurry conveying pipe; 16, alloy particle. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that various forms of implementation can be formed based on the present embodiments. At the same time, the present embodiments are only for the convenience of explaining the present application, so that the corresponding technicians can better understand its content. In use, the features in the present application can be combined and increased or decreased.

[0035] As shown in Figure 1 , Figure 2 and Figure 11 , a large-diameter deep stirring pile drilling tool 100 includes a top joint 1, a main rod 2, a spiral plate 3, a first stirring blade 4, a second stirring blade 5, a free blade 6, a tunneling blade 7, and a spiral drill tip 8; the top joint 1 is fixedly connected to the top of the main rod 2; the main rod 2 is provided with a material conveying channel 2-1 for solidified material conveying; the spiral plate 3 is arranged at the upper part of the drilling tool; the first stirring blade 4 and the second stirring blade 5 are arranged on the main rod 2 in the axial direction of the main rod 2; a plurality of first soil flow guide plates 4-1 are arranged on the first stirring blade 4 in a spaced manner; a plurality of second soil flow guide plates 5-1 are arranged on the second stirring blade 5 in a spaced manner; the free blade 6 is movably connected to the main rod 2; the tunneling blade 7 is arranged at the lower part of the drilling tool; the tunneling blade 7 is provided with a slurry conveying pipe 15 which is in communication with the material conveying channel 2-1; the tunneling blade 7 is provided with a grouting hole 13 which is in communication with the slurry conveying pipe 15; a plurality of cutting teeth 7-1 are arranged on the tunneling blade 7 in a spaced manner; the spiral drill tip 8 is fixedly connected to the bottom of the main rod 2 and is used for breaking hard stratum.

[0036] As shown in Figure 1 and Figure 2As shown, the rotation expansion angle range of the spiral plate 3 is 0°-1080°, forming one to three continuous spiral plates 3; the diameter of the continuous spiral plate 3 is in the form of variable diameter, and the maximum diameter is 2 / 3-1 / 2 of the pile diameter; the starting end and the end of the spiral plate 3 gradually reduce in diameter to the outer wall of the main rod 2, and the pitch of the spiral plate 3 is in the form of equal pitch. The spiral plate 3 is arranged on the upper part of the drilling tool, and the rotation speed and the drilling speed of the drill rod are controlled during the drilling process. The spiral plate 3 can have a lifting effect on the soil body, and the space generated in the underground soil body can reduce the high gas pressure caused by gas injection, thereby avoiding the problem of quality decline of the pile body and the influence on adjacent pile bodies due to air injection in clay with small porosity; the arrangement of the spiral plate also plays a certain role as a baffle to prevent the slurry from overflowing outward along the gap between the drill rod and the soil body; when the drill is lifted, by controlling the lifting speed and the rotation speed, the soil body can be compacted by the spiral plate 3.

[0037] As shown in Figure 1 and Figure 2 , the rotation stirring diameter range of the first stirring blade 4, the second stirring blade 5 and the digging blade 7 is 1500-3000mm, the included angle range of the first stirring blade 4, the second stirring blade 5 and the digging blade 7 with the horizontal plane is 10°-35°, and the cutting soil surface of the first stirring blade 4, the second stirring blade 5 and the digging blade 7 is in the form of a sharp blade, which is beneficial to better cutting and scattering the soil body. The first stirring blade 4 and the second stirring blade 5 can be arranged in the form of two, three or four products in an average separation manner, and different numbers of stirring blades can be selected according to different geological conditions to more reasonably stir the soil body; the digging blade 7 is in the form of two products, and the two products of the digging blade provide more space for the broken soil body.

[0038] As shown in Figure 8As shown, the first soil flow guide plate 4-1 is arranged at equal intervals on a single side or upper and lower sides of the first stirring blade 4; the second soil flow guide plate 5-1 is arranged at equal intervals on a single side or upper and lower sides of the second stirring blade 5, and the first soil flow guide plate 4-1 and the second soil flow guide plate 5-1 are arranged in pairs, a plurality of soil dispersing teeth 12 are arranged at equal intervals on the other side (relative to the side of the soil flow guide plate) of the first stirring blade 4 and the second soil flow guide plate 5-1, the acute angle between the first soil flow guide plate 4-1 and the long side of the first stirring blade 4 is 45°-75°, the acute angle between the second soil flow guide plate 5-1 and the long side of the second stirring blade 5 is 45°-75°, the first soil flow guide plate 4-1 and the second soil flow guide plate 5-1 can be arranged in a single row or double-row staggered arrangement, and the height of the first soil flow guide plate 4-1 and the second soil flow guide plate 5-1 is 50-100 mm. The first soil flow guide plate 4-1 and the first stirring blade 4 are arranged in opposite directions at an angle, and the second soil flow guide plate 5-1 and the second stirring blade 5 are arranged in opposite directions at an angle, the soil flow guide plates arranged in opposite directions can push the soil between adjacent stirring blades to the vicinity of the pile periphery and the pile core, respectively, so as to achieve mutual rubbing and shearing of the soil, making the mixing of the solidified material and the soil more uniform, the double-row arrangement of the soil flow guide plates can cut the guided soil twice on the same blade at the same time, making the mixing of the soil and the solidified agent more uniform, the pair of soil flow guide plates arranged in opposite directions ensures that the mixed soil is pushed back and forth on the pile section, and the single soil flow guide plate is easy to cause the mixed soil to gather in one direction, and the soil is easy to clump and plug the drill, and even the drill is buried in the area with hard geological conditions. As shown in Figure 9 As shown, the first stirring blade 4 and the second stirring blade 5 are provided with end cutting plates 11 at the ends, the end cutting plates 11 are sharp blades for cutting soil, and a plurality of alloy particles 16 are arranged on the outer surface. The arrangement of the end cutting plates 11 enables the drill to cut through the entire pile surface during rotation, making the pile boundary clearer, and the arrangement of the alloy particles 16 can improve the roughness of the pile boundary, which is beneficial to increasing the side friction resistance of the pile.

[0039] As shown in Figure 1 and Figure 13As shown, the free blade 6 is in the form of a horizontal blade, and is rotatably connected to the main rod 2 through a rotation limiting sleeve 9, and is located between the first stirring blade 4 and the second stirring blade 5. The length of the free blade 6 is slightly greater than the length of the first stirring blade 4 and the second stirring blade 5, and the free blade 6 can be provided in a single-layer or double-layer structure. The edges of the free blade 6 are in the form of sharp blades, and a plurality of soil dispersing plates 6-1 are provided on the free blade 6 at equal intervals, and the soil dispersing plates 6-1 are provided at intervals with the soil dispersing teeth 12. The stirring does not affect each other, the free blade 6 does not rotate with the main rod 2 in the soil, and only moves up and down in the vertical direction with the drilling tool, and the mixed soil between the blades is cut and dispersed in the vertical direction, and the relative movement between the soil dispersing plates 6-1 and the soil dispersing teeth 12 disperses and disrupts the mixed soil, thereby solving the problem of soil clumping and sticking the drill.

[0040] As shown in Figure 14 and Figure 15 , the free blade 6 can also be in the form of a hollow frame, and the upper frame 61 of the free blade 6 is rotatably connected to the main rod 2 through a first rotation limiting sleeve 9-1, and the lower frame 62 of the free blade 6 is rotatably connected to the main rod 2 through a second rotation limiting sleeve 9-2, and the first stirring blade 4 and the second stirring blade 5 are enclosed inside. The lower side of the upper frame 61 of the free blade 6 and the upper side of the lower frame 62 of the free blade 6 are respectively provided with a plurality of soil dispersing plates 6-1 at equal intervals. Through the frame shape, the stirring area and stirring space can be further increased, and the mixed soil between the blades can be further cut and dispersed through the cooperation between the blades, thereby further improving the stirring uniformity and further improving the stirring effect.

[0041] As shown in Figures 1 to 4 , each cutting tooth 7-1 is provided at an interval on the radius of the circular face formed by the rotation of the digging blade 7, and the angle between the cutting tooth 7-1 and the long side of the digging blade 7 gradually increases away from the main rod 2, so that the sharp edge of the cutting tooth 7-1 is always perpendicular to the cutting surface of the soil, and effective cutting is ensured. The angle between the cutting tooth 7-1 and the horizontal plane is consistent with the angle between the digging blade 7 and the horizontal plane, so that the cutting tooth 7-1 and the digging blade 7 cut the soil more smoothly.

[0042] As shown in Figures 4 to 7As shown, the shot hole 13 is arranged at the bottom of the digging blade 7 and hidden in the gap between the digging blade 7 and the shot pipe 15; it ensures that the soil does not directly contact the shot hole 13 during the drilling and lifting process, effectively reducing the probability of the shot hole 13 being blocked. The shot hole 13 is in the form of a continuous slit; the opening shape of the shot hole 13 is in the form of a ladder, a triangle or other slit width varying shapes, and the opening of the shot hole 13 gradually increases in the direction away from the main rod 2, and the overall slit-shaped shot hole can effectively prevent the overall shot hole from being blocked, even if a part is blocked, the adjacent slit can gradually open the blocked part, and finally the entire shot hole is penetrated; at the same time, the continuously increasing slit width can ensure that the circular area swept by each ladder is consistent and the material output of each ladder is consistent under the same flow, so that the solidified material is uniformly distributed on the pile body cross section, preventing local aggregation of the solidified material. The shot pipe 15 is provided with a plug screw 14 at the end, which is convenient for disassembling and cleaning the internal deposited solidified agent material particles of the shot pipe.

[0043] As shown in Figure 1 and Figure 2 , the spiral drill tip 8 adopts a short spiral structure and is arranged at a certain angle with the drill tip teeth 8-1, and the spiral drill tip 8 uses the self-tapping characteristics of the spiral to perform a powerful drilling operation at the bottom end of the drilling tool. The cutting teeth 7-1 and the drill tip teeth 8-1 are made of alloy material, the first stirring blade 4, the second stirring blade 5 and the digging blade 7 are all welded with alloy wear-resistant strips 10 on the side cutting the soil, and the edge of the spiral plate 3 is welded with wear-resistant plates 3-1, which can reduce the wear of the blades and the teeth plates, prolong the service life of the drilling tool and improve the overall economic benefit.

[0044] As shown in Figure 11 and Figure 17 , a stirring device includes a driving drill rod 200, a high-pressure gas pump 700, a high-pressure grouting pump 800 and the large-diameter deep stirring pile drilling tool 100 described above; the lower end of the driving drill rod 200 is connected with the top joint 1, the top joint 1 adopts an internal hexagonal female joint, the lower end of the driving drill rod 200 is fixedly connected with an external hexagonal male joint, and the driving drill rod 200 and the top joint 1 are fixed by being inserted into each other and inserted into the pin holes of the joint with a pin; the material conveying channel 2-1 is connected with the material channel arranged in the driving drill rod 200, and the driving drill rod 200 is connected with a power head 300; the power head 300 is provided with a water faucet 400 connected with the material channel; the high-pressure gas pump 700 is connected with an external gas conveying channel 600, the high-pressure grouting pump 800 is connected with an external slurry conveying channel 500, and the external gas conveying channel 600 and the external slurry conveying channel 500 are connected through a three-way joint and then connected with the water faucet 400.

[0045] A construction process of a stirring device includes the following construction procedures:

[0046] 1) Equipment assembly: after the drilling rig arrives, the high-pressure air pump 700 and the high-pressure grouting pump 800 are connected to the water faucet 400 on the drilling rig through the external air delivery channel 600 and the external slurry delivery channel 500; the upper part of the active drill rod 200 is connected to the power head 300, and the lower part is connected to the mixing pile drilling tool 100 through the top joint 1.

[0047] 2) Construction parameter setting: for the two-mixing-one-spraying or four-mixing-two-spraying process, the drilling rig downhole speed, the drilling rig lifting speed, the drill rod drilling speed, the drill rod rotation direction, and the solidifying agent injection amount per unit pile length are set; the mixing station background starts the solidifying agent slurry mixing operation. After the slurry preparation is completed, the strong pressure generated by compressed air increases the injection speed of the solidifying agent material.

[0048] 3) Drilling rig downhole stage: the drilling rig is positioned and started, the high-pressure air pump 700 and the high-pressure grouting pump 800 are adjusted to regulate the air pressure and the grouting pressure to perform solidifying agent quantitative spreading, and the mixing pile drilling tool 100 rotates in the clockwise direction to perform drilling and mixing operations in the downhole stage. The spiral drill tip 8 uses the self-tapping characteristics of the spiral to perform strong drilling operations at the bottom end of the drilling tool. When the solidifying agent is quantitatively spread, the strong pressure generated by compressed air increases the injection speed of the solidifying agent material. The spiral plate 3 at the upper part of the mixing pile drilling tool 100 lifts the soil during the downhole process, reducing the in-situ pressure. Due to the stepped communication joint structure of the grouting hole 13, the cement slurry can be uniformly spread on the pile cross section. The soil flow guide plate arrangement stirs and rubs the mixed soil back and forth, providing a stronger and more uniform mixing effect. The relative movement of the free blade 6, the soil dispersing plate 6-1 arranged on it, and the soil dispersing teeth 12 arranged on the stirring blade can disperse the soil, preventing the mixed soil from sticking to the drill and causing the drill to seize. The cutting of the end cutting plate 11 makes the pile surface more obvious, and the alloy particles 16 increase the roughness of the pile surface. The downhole operation of the mixing drilling tool continues until it reaches the designed pile bottom elevation.

[0049] 4) Drilling rig uphole stage: the drilling rig continues to apply reverse torque and lifting force to the active drill rod 200 according to the construction parameters to implement the secondary mixing operation in the uphole stage. During the mixing construction in the uphole stage, the high-pressure grouting pump 800 stops grouting. At this time, due to the first mixing of the pile body, the mixed soil is relatively soft, so the mixing speed and the lifting speed can be appropriately increased. The reverse mixing simultaneously mixes the soil and the cement slurry for the second time. The soil flow guide plate, the stirring blade, and the tunneling blade work together, and the free blade 6 vertically cuts the soil to prevent the solidified soil from clumping and sticking to the drill. The uphole operation of the drilling tool reaches the designed pile top elevation, completing the mixing pile two-mixing-one-spraying construction process.

[0050] 5) If the four-mixing-two-spraying construction process is adopted, steps 3) and 4) need to be repeated.

[0051] Example One

[0052] The present application is further described below in conjunction with Figures 1-2 、 Figure 7 (a)、 Figure 8 (a)、 Figure 8 (b)、 Figure 10 and Figure 11 The engineering background of the embodiment is a large-diameter mixing pile in a composite ground base of a coastal harbor concrete prefabricated member storage yard. The pile length is 25 m, the pile diameter is 2500 mm, the design ultimate bearing capacity of the mixing pile composite foundation is 320 kPa, and the 28-day unconfined compressive strength of the mixing pile is not less than 1.0 MPa.

[0053] The basic situation of the embodiment is that the site foundation soil is a deep marine saturated clay foundation, the water content is w=56%, e=1.21, qc=0.2 MPa, fs=6.7 kPa, SPT=3-8, the solidifying agent is KD solidifying agent, the mixing amount is 15%, the water-cement ratio is 0.6, the slurry+air injection method is used for solidifying agent slurry injection, and the drilling tool shown in Figure 1 is used for construction of the pile group A, and the traditional mixing drilling tool in the market is used for comparison construction of the pile group B, and the two-mixing-one-injection construction technology of the mixing pile is applied.

[0054] As shown in Figure 1 , the construction drilling tool in the embodiment one includes a top sub 1, a main rod 2, a spiral plate 3, a first mixing blade 4, a second mixing blade 5, a free blade 6, a digging blade 7, and a spiral drill tip 8. The top sub 1 is connected to the driving drill rod 200. The spiral plate 3 has a diameter of 2 / 3 of the pile diameter, and a rotation expansion angle range of 0°-540°, forming 1.5 turns of continuous spiral plate 3. As shown in Figure 10 , the first mixing blade 4, the second mixing blade 5, and the digging blade 7 have a diameter of 2500 mm, and an included angle range with the horizontal plane of 25°, and are both two-piece settings. As shown in Figure 8 (a)、 Figure 8(b) as shown, the soil flow guide is in the form of a single row, the first soil flow guide 4-1 is arranged on the upper surface of the first stirring blade 4, the second soil flow guide 5-1 is arranged on the lower surface of the second stirring blade 5, the size of the soil flow guide is 100mm*50mm, and the acute angle between the soil flow guide and the long side of the complex stirring blade is 45°; the soil dispersing tooth 12 is arranged on the lower surface of the first stirring blade 4 and the upper surface of the second stirring blade 5 respectively; the end cutting plate 11 is arranged at the end of the first stirring blade 4 and the second stirring blade 5, the end cutting plate 11 is in the form of a sharp blade when cutting the soil surface, and a plurality of alloy particles 16 are arranged on the outer surface of the end cutting plate 11; the free blade 6 is rotatably connected to the main rod 2 through the rotating limiting shaft sleeve 9, is located between the first stirring blade 4 and the second stirring blade 5, the length of the free blade 6 is slightly greater than that of the first stirring blade 4 and the second stirring blade 5, a plurality of soil dispersing plates 6-1 are arranged on the free blade 6 at equal intervals, and the soil dispersing plates 6-1 are arranged at intervals with the soil dispersing tooth 12; the cutting tooth is arranged in the same way as in the basic embodiment, and the angle with the horizontal plane is 25°; as shown in Figure 7 (a) as shown, the opening of the jetting hole 13 is in the form of a stepped slot, and the jetting hole 13 is hidden behind the tunneling blade 7 to avoid direct contact with the soil and blockage; the form of the spiral drill tip 8, the arrangement of the alloy wear-resistant strip 10 and the wear-resistant plate 3-1 are the same as in the basic embodiment.

[0055] The construction process of the drilling tool in the embodiment is basically similar to the construction process of the above-mentioned stirring device, except that the construction process adopts two stirring and one jetting, so the implementation steps of the embodiment will not be repeatedly introduced.

[0056] In the test, in the construction process of the engineering pile A group, the soil is lifted by the spiral plate 3 arranged on the upper part of the drill bit, the pressure in the ground during the jetting and air injection process is obviously smaller than that of the comparison construction B group, the gas dissipates faster in the ground, and no slurry is seen to be ejected along the periphery of the drill rod during the stirring process, and no phenomenon of slurry ejection due to excessive pressure in the ground occurs when the drill is lifted to the ground surface.

[0057] After 28 days, through the core sampling of the pile body cement soil and the unconfined compressive strength test of the core sample, it can be known that: the overall core sampling rate of the engineering pile A group adopting the drilling tool of the embodiment 1 is 90%, the unconfined compressive strength is maintained at about 1.2MPa, and the fluctuation is not large; the overall core sampling rate of the comparison test pile B group adopting the traditional stirring drilling tool on the market is 67%, the unconfined compressive strength is 0.1-3.0MPa, and the pile body uniformity is poor; from the above results, the stirring performance of the drilling tool of the embodiment is better than that of the traditional stirring drilling tool on the market.

[0058] Embodiment two

[0059] The following will be described in combination with Figure 13 , Figure 7 (c), Figure 8 (c), Figure 8 (d),Figure 12 To further illustrate the present application, the engineering background of the present embodiment is the construction of gravity type cement soil retaining wall for deep foundation pit support, which adopts double-row mixing pile design, the pile length is 35 m, the pile diameter is 1800 mm, the 28-day unconfined compressive strength of the mixing pile is required to be not less than 0.9 MPa, and the permeability coefficient k is required to be not greater than 10 -7 cm / s.

[0060] The basic situation of the present embodiment is that the two-layer foundation soil of the site is ① clay, the layer thickness is 14 m, the water content is w = 35%, e = 1.14, SPT = 3-7, ② silty sand, the layer thickness is 28 m, the water content is w = 27%, SPT = 7-28; 42.5 cement is adopted, 3% bentonite is added, the mixing amount is 13%, the water-cement ratio is 1.2, and the slurry + air injection method is used for solidifying agent slurry injection; the drilling tool shown in Figure 13 A group of engineering piles is constructed, and a traditional mixing drilling tool in the market is used for comparison and construction of B group, and the two-mixing-one-injection construction technology of mixing pile is used.

[0061] The construction drilling tool used in the present embodiment is basically the same as the drilling tool used in embodiment one, only the following changes are made: the rotation expansion angle range of the spiral plate 3 is 0°-720°, forming two circles of continuous spiral plates; as shown in Figure 12 The first mixing blade 4, the second mixing blade 5 and the digging blade 7 have a diameter of 1800 mm, the included angle of the blade with the horizontal plane is 20°, the mixing blade is provided in three pieces, and the digging blade is provided in two pieces; as shown in Figure 8 (c)、 Figure 8 (d), the soil flow guide plate is in the form of double rows, the first soil flow guide plate 4-1 is arranged on the upper and lower surfaces of the first mixing blade 4, the second soil flow guide plate 5-1 is arranged on the upper and lower surfaces of the second mixing blade 5, the size of the first soil flow guide plate 4-1 and the second soil flow guide plate 5-1 is 60 mm x 50 mm, and the acute angle between the first soil flow guide plate 4-1 and the second soil flow guide plate 5-1 and the long side of the mixing blade is 60°; the free blade 6 and the mixing blade are not provided with the soil dispersing plate 6-1 and the soil dispersing tooth 12; the included angle of the cutting tooth with the horizontal plane is 20°; the opening of the injection hole 13 is in the form of a gradually changing joint, as shown in Figure 7 (c).

[0062] The construction procedure of the drilling tool of the present embodiment is basically similar to the construction technology of the above-mentioned mixing device, only the construction technology adopts two-mixing-one-injection, so the implementation steps of the present embodiment will not be introduced again.

[0063] During the test, no slurry was seen to be ejected along the periphery of the drill rod during the slurry injection and air mixing process of the engineering pile A group, and no slurry ejection phenomenon due to excessive ground pressure occurred when the drill rod was lifted to the ground.

[0064] After 28 days, the overall coring rate of the A group of engineering piles using the drilling tool of the present embodiment was 92%, and the unconfined compressive strength was maintained at about 1.12 MPa with little fluctuation; the overall coring rate of the B group of control test piles was 53%, and the unconfined compressive strength was 0.1-3.2 MPa, and the pile uniformity was poor. From the above results, it can be seen that the mixing performance of the drilling tool of the present embodiment is superior to that of the traditional mixing drilling tool on the market.

[0065] Example Three

[0066] The present application will be further described and illustrated below Figure 14 , Figure 15 , Figure 16 , Figure 7 (d)、 Figure 8 (a)、 Figure 8 (b)、 Figure 11 The present application will be further described and illustrated below The engineering background of the present embodiment is a steel cement soil mixing pile wall (SMW method pile) for deep foundation pit support construction, the design mixing pile length is 22 m, the pile diameter is 2000 mm, the H-shaped steel pile length is 22 m, the H-shaped steel cross section is 850x300, the 28-day unconfined compressive strength of the mixing pile is not less than 0.8 MPa, and the permeability coefficient k = 10 -7 cm / s.

[0067] The basic situation of the present embodiment is as follows: the two layers of foundation soil on the site are ① clay, layer thickness 20 m, water content w = 51%, e = 1.22, SPT = 3-12, and ② silty clay, layer thickness 26 m, water content w = 38%, SPT = 10-26; 42.5 cement is used, the mixing amount is 16%, the water-cement ratio is 0.9, the single-channel slurry + air injection method is used for solidification agent slurry injection for solidification agent spreading, and the Figure 1 drilling tool shown in the figure is used to construct the A group of engineering piles, and the traditional mixing drilling tool on the market is used to construct the B group of engineering piles for comparison, the four-mixing and two-injection construction technology of the mixing pile and the H-shaped steel vibration insertion construction technology are used.

[0068] As shown in Figures 14 to 16 , the construction mixing drilling tool 100 in Example One includes a top joint 1, a main rod 2, a spiral plate 3, a first mixing blade 4, a second mixing blade 5, a free blade 6, a digging blade 7, and a spiral drill tip 8; the spiral plate 3 has a diameter of 1 / 2 of the pile diameter, and a rotation expansion angle range of 0°-90°, forming 2.5 turns of continuous spiral plates; as shown in Figure 16 , the first mixing blade 4, the second mixing blade 5, and the digging blade 7 have a diameter of 2000 mm, and the blade and the horizontal plane have an included angle range of 15°, the first mixing blade 4 and the second mixing blade 5 are arranged in four pieces, and the digging blade 7 is arranged in two pieces; as shown in Figure 8 (a)、 Figure 8(b) shown, the soil flow guide is in the form of a single row, the first soil flow guide 4-1 is arranged on the lower surface of the first stirring blade 4, the second soil flow guide 5-1 is arranged on the upper surface of the second stirring blade 5, the size of the soil flow guide is 100mm*60mm, and the acute angle between the soil flow guide and the long side of the complex stirring blade is 70°; the soil dispersing teeth 12 of the stirring blade are arranged on the upper surface of the first stirring blade 4 and the lower surface of the second stirring blade 5 respectively; the upper frame 61 of the free blade 6 is located above the first stirring blade 4 and is rotatably connected to the main rod 2 through the first rotating limiting shaft sleeve 9-1, the lower frame 62 is located below the second stirring blade 5 and is rotatably connected to the main rod 2 through the second rotating limiting shaft sleeve 9-2, a plurality of soil dispersing plates 6-1 are arranged at equal intervals on the lower side of the upper frame 61 and the upper side of the lower frame 62, and the soil dispersing plates 6-1 are spaced apart from the soil dispersing teeth 12; the angle between the cutting tooth and the horizontal plane is 15°; the opening shape of the jetting hole 13 is as Figure 7 (d) shown.

[0069] The construction process of the stirring drilling tool in the embodiment is basically similar to the construction process of the embodiment 1, except that the construction process adopts four stirring and two jetting and H-shaped steel vibration insertion construction is added, so the implementation steps of the embodiment are not repeatedly introduced.

[0070] In the test process and the 28-day coring condition, the overall coring rate of the A group of engineering piles using the drilling tool in the embodiment 3 is 88%, and the unconfined compressive strength is maintained at about 0.9MPa, with little fluctuation; the overall coring rate of the B group of control test piles using the traditional stirring drilling tool on the market is 63%, and the unconfined compressive strength is 0.07-3.1MPa, and the pile body uniformity is poor; from the above results, the stirring performance of the drilling tool of the embodiment is better than that of the traditional stirring drilling tool on the market.

[0071] Although the present disclosure is as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present disclosure.

Claims

1. A large-diameter deep-mixing pile drill, characterized in that, It includes top joint (1), main rod (2), first stirring blade (4), second stirring blade (5), free blade (6), digging blade (7) and spiral drill tip (8), the top joint (1) is fixedly connected on the top of the main rod (2), the main rod (2) is internally provided with material conveying channel (2-1) for solidified material conveying, the first stirring blade (4) and the second stirring blade (5) are spaced apart along the axial direction of the main rod (2) and are arranged on the main rod (2), the free blade (6) is movably connected on the main rod (2), the digging blade (7) is arranged on the lower part of the drill tool, the bottom of the digging blade (7) is provided with slurry conveying pipe (15) which is communicated with the material conveying channel (2-1), the digging blade (7) is provided with slurry injection hole (13) which is communicated with the slurry conveying pipe (15), and the spiral drill tip (8) is fixedly connected on the bottom of the main rod (2). It also includes spiral plate (3), and the spiral plate (3) is arranged on the outer wall of the upper part of the main rod (2). The digging blade (7) is further provided with a plurality of cutting teeth (7-1) which are arranged at intervals, each cutting tooth (7-1) is arranged at intervals on the radius of the circular surface formed by the rotation of the digging blade (7), the angle between the cutting tooth (7-1) and the long side of the digging blade (7) gradually increases in the direction away from the main rod (2), the angle between the cutting tooth (7-1) and the horizontal plane is consistent with the angle between the digging blade (7) and the horizontal plane, the slurry injection hole (13) is arranged at the bottom of the digging blade (7) and is hidden in the gap between the digging blade (7) and the slurry conveying pipe (15), the slurry injection hole (13) is in the form of a continuous seam, the opening of the slurry injection hole (13) gradually increases in the direction away from the main rod (2), the circular area swept by each step is consistent and the material output of each step is consistent under the same flow, and a plug screw (14) is arranged at the end of the slurry conveying pipe (15).

2. The large-diameter deep-mixing pile drill according to claim 1, characterized in that, The rotation expansion angle range of the spiral plate (3) is 0°-1080°, forming one to three continuous spiral plates (3), the diameter of the continuous spiral plate (3) is in the form of variable diameter, and the maximum diameter is 2 / 3-1 / 2 of the pile diameter, the diameter of the initial end and the terminal end of the spiral plate (3) gradually decreases to the outer wall of the main rod (2), and the pitch of the spiral plate (3) is equal pitch type.

3. The large-diameter deep-mixing pile drill according to claim 1, characterized in that, The free blade (6) is rotatably connected to the main rod (2) through a rotating limiting shaft sleeve (9), and the free blade (6) is located between the first stirring blade (4) and the second stirring blade (5), the length of the free blade (6) is greater than the length of the first stirring blade (4) and the second stirring blade (5), the edges of the free blade (6) are in the form of sharp blades, and a plurality of soil dispersing plates (6-1) are arranged at equal intervals on the free blade (6).

4. The large-diameter deep-mixing pile drill according to claim 1, characterized in that, The free blade (6) is in a hollow frame shape, the upper layer frame (61) of the free blade (6) is rotatably connected to the main rod (2) through the first rotation limiting shaft sleeve (9-1), the lower layer frame (62) of the free blade (6) is rotatably connected to the main rod (2) through the second rotation limiting shaft sleeve (9-2), and the first stirring blade (4) and the second stirring blade (5) are surrounded inside; the lower side of the upper layer frame (61) of the free blade (6) and the upper side of the lower layer frame (62) of the free blade (6) are respectively provided with a plurality of soil dispersing plates (6-1) at equal intervals.

5. The large-diameter deep-mixing pile drill according to claim 1, characterized in that, The rotating stirring diameter range of the first stirring blade (4), the second stirring blade (5) and the tunneling blade (7) is 1500-3000mm, the included angle range of the first stirring blade (4), the second stirring blade (5) and the tunneling blade (7) with the horizontal plane is 10°-35°, and the soil cutting surface of the first stirring blade (4), the second stirring blade (5) and the tunneling blade (7) is in a sharp blade shape, the first stirring blade (4) and the second stirring blade (5) are arranged in at least two pieces in an average separation manner, and the tunneling blade (7) is arranged in two pieces.

6. The large-diameter deep-mixing pile drill according to claim 1, characterized in that, The first stirring blade (4) is provided with a plurality of first soil flow guide plates (4-1) at equal intervals; the second stirring blade (5) is provided with a plurality of second soil flow guide plates (5-1) at equal intervals, and the first soil flow guide plates (4-1) and the second soil flow guide plates (5-1) are arranged in pairs, the other side of the first stirring blade (4) and the second soil flow guide plates (5-1) is provided with a plurality of soil dispersing teeth (12) at equal intervals, the acute angle between the first soil flow guide plates (4-1) and the long side of the first stirring blade (4) is 45°-75°, the acute angle between the second soil flow guide plates (5-1) and the long side of the second stirring blade (5) is 45°-75°, the soil flow guide plates on the same blade are arranged in a single row or double rows; the angle direction of the first soil flow guide plates (4-1) and the first stirring blade (4) is opposite to the angle direction of the second soil flow guide plates (5-1) and the second stirring blade (5); the height of the first soil flow guide plates (4-1) and the second soil flow guide plates (5-1) is 50-100mm respectively; the end of the first stirring blade (4) and the second stirring blade (5) is provided with an end cutting plate (11), the soil cutting surface of the end cutting plate (11) is in a sharp blade shape, and a plurality of alloy particles (16) are arranged on the outer surface.

7. A stirring apparatus, characterized by The deep mixing pile drilling tool comprises a driving drill pipe (200), a high-pressure air pump (700), a high-pressure grouting pump (800), and a large-diameter deep mixing pile drilling tool according to any one of claims 1-6; the lower end of the driving drill pipe (200) is connected with the top joint (1), the top joint (1) is an internal hexagonal female joint, the lower end of the driving drill pipe (200) is fixedly connected with an external hexagonal male joint, and the driving drill pipe (200) and the top joint (1) are fixed by being inserted into each other and inserted into pin holes on the joint by a pin; a material conveying channel (2-1) is connected with a material channel arranged in the driving drill pipe (200), and the driving drill pipe (200) is connected with a power head (300); the power head (300) is provided with a water faucet (400) connected with the material channel; the high-pressure air pump (700) is connected with an external air conveying channel (600), the high-pressure grouting pump (800) is connected with an external slurry conveying channel (500), and the external air conveying channel (600) and the external slurry conveying channel (500) are connected with the water faucet (400) through a three-way joint.

Images