A slit-shaped uniform distribution atomizing spray structure

Abstract

The application discloses a slit type uniform distribution atomization spraying structure, which comprises a drill center rod and a drilling wing plate, slurry medium channels and gas medium channels are arranged in the drill center rod; an atomization spraying unit is arranged on the drilling wing plate, the atomization spraying unit comprises slurry drainage channels, gas drainage channels and an atomization sprayer, one end of the slurry drainage channels and the gas drainage channels is communicated with the atomization sprayer, and the other end is communicated with the slurry medium channels and the gas medium channels correspondingly, the atomization sprayer comprises a slurry cavity area, a slurry nozzle, a gas cavity area, a gas nozzle, a mixing cavity area and a mixing nozzle, the inner wall of the slurry cavity area in the projection area of a slurry inlet is a slope, the slope in the projection area of the slurry inlet of the slurry cavity area is designed, the traditional right-angle communication is replaced by the slope reflection guidance, the kinetic energy sudden drop caused by the fluid frontal impact is avoided, the slurry and the gas are sprayed out at a higher speed, the impact effect is enhanced, and the channel blockage risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of foundation construction and spraying equipment, and in particular to a slotted uniform atomization spraying structure. Background Technology

[0002] Deep mixing pile engineering technology uses single-axis or multi-axis mixing drilling rigs to introduce cement and other curing agents underground. Through mixing with soft and hard soil, a series of physical and chemical reactions occur between the curing agent and the soil, generating piles, walls, and blocks with high strength, good water stability, and strong seepage prevention performance. This effectively solves practical engineering problems such as the bearing capacity of composite foundations, the bearing capacity of mixing piles, the bearing capacity of reinforced composite piles, the bearing capacity of SMW method piles, the seepage resistance of water-retaining walls, and the sealing walls and sealing layers for contaminated soil and toxic substance landfills.

[0003] Deep mixing pile engineering technology has been widely used in the civil engineering field due to its advantages such as simple drilling equipment, high construction efficiency, and low cost. However, currently, when designing drilling tools for mixing pile construction, a grouting nozzle is set on the center rod of the drill bit for grouting. The grouting agent is mixed with the soil by the mixing blades to form a mixing pile of a certain diameter. However, it is difficult to achieve uniform mixing of the grout around the center rod of the drill bit through soil agitation. This often results in serious engineering quality problems such as the grouting agent flowing upwards along the gap between the drill bit and the drill rod, the grouting agent accumulating in some areas, especially the central area, and ultimately causing the strength of the cement-soil on the periphery to be much lower than that on the center, and the overall strength of the solidified soil to be lower than the design value. These problems frequently lead to serious engineering safety issues. Especially when engineering projects require the construction of large-diameter, deep mixing piles, the use of mixing drilling tools with conventional grouting nozzle designs is more likely to bring engineering quality and safety risks.

[0004] In addition, based on the conventional slurry dispensing method of mixing drill bits, the slurry is unevenly distributed in the mixing zone, which cannot soften all the soil in the mixing zone. This causes the drill bit to encounter greater resistance during rotation, descent and lifting, which not only increases energy consumption, but also greatly limits the drilling footage, making it impossible to penetrate slightly harder strata and limiting the drilling depth.

[0005] In addition, conventional mixing piles rely on the pressure provided by the grouting pump to deliver the solidified grout to the grout outlet on the drill bit. Due to friction in the delivery pipeline and changes in direction at bends, the flow rate and pressure decrease significantly when they reach the outlet. When the outlet pressure is low, the grout cannot disperse the soil, resulting in poor mixing uniformity, uneven distribution of solidified material, and ineffective utilization. When the outlet pressure is lower than the external water and soil pressure, the outlet is easily blocked and grout cannot be discharged.

[0006] The current civil engineering market urgently needs to solve the aforementioned engineering and technical problems. Some existing conventional solutions include: 1. Increasing the grouting pressure to deliver the grout to the outside of the pile body via a jet, or increasing the cement grout content to increase the chance of uniform mixing. However, these methods require additional equipment or materials, increasing construction costs. 2. Using a four-mixing-two-spraying or multi-mixing-multi-spraying process to increase mixing time, which improves uniformity to some extent, but reduces construction efficiency. 3. Moving the grouting nozzle to the mixing blades, or even adding multiple grouting holes to the mixing or excavating blades to achieve uniform grouting within the pile radius, attempting to compensate for the deficiencies in the center rod grouting design. This provides some improvement, but still cannot achieve uniform grout coverage along the radius, or some grout outlets may become blocked during construction. 4. Adding an air passage outside the grout delivery channel improves local uniformity to some extent, but due to unreasonable structural design, it also cannot effectively achieve uniform distribution of the solidified material, resulting in a large coefficient of variation in the forming strength at different points on the same cross-section of the pile. Therefore, this problem has not been fundamentally solved in the industry. Summary of the Invention

[0007] This invention overcomes the shortcomings of the prior art and provides a slit-type uniform atomization spray structure.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a slotted uniform atomizing spray structure, comprising: a drill bit center rod and a cutting wing plate, wherein the cutting wing plate is arranged radially along the drill bit center rod, and a medium channel is provided inside the drill bit center rod, wherein the medium channel includes a slurry medium channel and a gas medium channel;

[0009] The excavating wing plate is provided with an atomizing spray unit, which includes a slurry diversion channel, a gas diversion channel and an atomizing sprayer. One end of the slurry diversion channel and the gas diversion channel are connected to the atomizing sprayer, and the other end is connected to the slurry medium channel and the gas medium channel respectively.

[0010] The atomizing jet includes a slurry chamber area, a slurry nozzle, a gas chamber area, a gas nozzle, a mixing chamber area, and a mixing nozzle. The slurry chamber area, the gas chamber area, and the mixing chamber area are all flat and elongated cavity structures, and the slurry nozzle, the gas nozzle, and the mixing nozzle are slit-shaped structures.

[0011] The inner wall of the slurry cavity area in the projection area of ​​the slurry inlet is an inclined surface, and the direction of the inclined surface is at an angle to the direction of slurry flow.

[0012] In a preferred embodiment of the present invention, the opening width of the slurry nozzle increases along its length.

[0013] In a preferred embodiment of the present invention, the slurry nozzle is located above the gas nozzle.

[0014] In a preferred embodiment of the present invention, the angle between the inclined plane direction and the slurry flow direction is θ, and the range of θ is 30°≤θ≤60°.

[0015] In a preferred embodiment of the present invention, the total width of the coverage area sprayed by the mixing nozzle along the length direction of the excavating wing plate is L1, the length of the excavating wing plate is L2, and L1 and L2 satisfy the relationship: 0.8×L2≤L1≤L2.

[0016] In a preferred embodiment of the present invention, the opening area of ​​the mixing nozzle is A1, the opening area of ​​the slurry nozzle is A2, and the opening area of ​​the gas nozzle is A3, and the relationship among the three is: A1 <A2+A3。

[0017] In a preferred embodiment of the present invention, the atomizing spray unit includes two forms: a single-sided atomizing spray unit and a double-sided atomizing spray unit.

[0018] In a preferred embodiment of the present invention, the unilateral atomizing unit has the following shape:

[0019] The drill bit center rod is provided with a medium channel, which includes several slurry medium channels and several gas medium channels;

[0020] A set of atomizing spray units is provided on the excavating wing plate, which is located on one side of the drill bit center rod.

[0021] The slurry chamber is located above the gas chamber, and the slurry nozzle is located above the gas nozzle.

[0022] One end of the slurry diversion channel and the gas diversion channel are connected to the atomizing injector. One end of each of the slurry diversion channel and the gas diversion channel is connected to the atomizing injector, and the other end is connected to the slurry medium channel and the gas medium channel respectively. The atomizing injector is located below the excavating wing plate. The slit structure of the mixing nozzle is a trapezoidal slit structure.

[0023] A one-way valve is installed at the end of the gas diversion channel.

[0024] In a preferred embodiment of the present invention, the morphology of the dual-sided atomizing element is as follows:

[0025] The drill bit center rod is provided with a medium channel, which includes several slurry medium channels and several gas medium channels;

[0026] The atomizing spray unit consists of two sets, which are respectively installed on the digging wing plates on both sides of the drill bit center rod;

[0027] The slurry chamber is located above the gas chamber, and the slurry nozzle is located above the gas nozzle.

[0028] One end of the slurry diversion channel and the gas diversion channel are connected to the atomizing injector. One end of each of the slurry diversion channel and the gas diversion channel is connected to the atomizing injector, and the other end is connected to the slurry medium channel and the gas medium channel respectively. The atomizing injector is located below the excavating wing plate. The slit structure of the mixing nozzle is a trapezoidal slit structure.

[0029] A one-way valve is installed at the end of the gas diversion channel.

[0030] In a preferred embodiment of the present invention, the cutting flanges on both sides of the drill bit center rod include cutting flanges on both sides of the same straight line or cutting flanges on both sides in the vertical direction.

[0031] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0032] (1) This invention integrates a slurry medium channel and a gas medium channel in the center rod of the drill bit and sets an atomizing spray unit on the excavation wing plate to realize the integrated operation of "excavation-atomizing spray-medium mixing". No additional external spraying device is required. The airflow carries the solidifying agent slurry and other fluids and sprays them out at high speed to collide and scour the in-situ soil within the radius. This causes the in-situ soil structure to be broken up, the soil blocks to be crushed, and the cohesion between the broken soil or soil particles to be greatly weakened. The fluidity of the soil is significantly enhanced, which in turn greatly reduces the soil resistance when the drill bit rotates, advances, and is lifted.

[0033] Meanwhile, the inclined design of the slurry inlet projection area of ​​the slurry chamber replaces the traditional right-angle connection with "inclined reflection guidance", avoiding the sudden drop in kinetic energy caused by the frontal impact of the fluid, so that the slurry and gas are ejected at a higher speed, which not only enhances the impact effect, but also reduces the risk of channel blockage. There is no need to rely on traditional complex solutions such as "increasing the slurry pressure and increasing the cement content" or "four mixing and two spraying / multiple mixing and multiple spraying". Uniform mixing can be achieved with just a single atomization spray structure, reducing construction costs and operational complexity.

[0034] (2) By designing the atomizing injector as a flat and elongated cavity, and the slurry nozzle, gas nozzle, and mixing nozzle as slit-type nozzles, and combining the coverage range of the mixing nozzle along the length of the excavation wing plate of 0.8×L2≤L1≤L2, the curing agent slurry is atomized and evenly spread within the radius of the pile body, avoiding the problem of "central concentration and peripheral sparseness" caused by traditional central rod grouting, greatly reducing the coefficient of variation of the forming strength at each point of the same cross section of the pile body, so that the overall strength of the solidified soil meets the design standard, and reducing the engineering safety hazards caused by uneven strength.

[0035] (3) The design of the mixed nozzle opening area A1 < grout nozzle A2 + gas nozzle A3 in this application not only ensures the outlet pressure to enhance the impact effect, but also accurately distributes the grout flow rate within the pile radius through non-uniform width nozzle structures such as "trapezoidal slit" (the opening width of the grout nozzle and the mixed nozzle increases along the length direction), avoiding material waste caused by the grout spraying exceeding the pile diameter. At the same time, the outlet of the mixing cavity becomes narrower, which is conducive to further increasing the outlet pressure, increasing the grout and gas flow rate, enhancing the impact or scouring effect on the soil, making it easy to mix evenly, and also preventing external soil from rushing into the cavity. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0037] Figure 1 This is a schematic diagram of a single-sided atomizing unit structure of a slot-type uniformly distributed atomizing spray structure according to a preferred embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of a single-sided atomizing unit structure of a slot-type uniformly distributed atomizing spray structure according to a preferred embodiment of the present invention;

[0039] Figure 3 This is another structural schematic diagram of a single-sided atomizing unit of a slot-type uniformly distributed atomizing spray structure according to a preferred embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the double-sided atomizing unit structure of the slot-type uniformly distributed atomizing spray structure according to a preferred embodiment of the present invention;

[0041] Figure 5 This is another structural schematic diagram of the double-sided atomizing unit of the slit-type uniformly distributed atomizing spray structure according to a preferred embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the fluid entering the atomizer and turning state in a slit-type uniformly distributed atomizing jet structure according to a preferred embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of a single-axis unidirectional rotating drill bit structure using the slotted uniform atomization stirring spray structure of the present invention, according to a preferred embodiment of the present invention.

[0044] Figure 8 This is a schematic diagram of a single-axis unidirectional rotating drill bit structure employing multiple sets of the slit-type uniformly distributed atomizing and stirring spray structure of the present invention, according to a preferred embodiment of the present invention.

[0045] Figure 9 This is a side view of a single-axis multi-layer shear drill bit employing multiple sets of the slit-type uniformly distributed atomizing and stirring spray structure of the present invention, according to a preferred embodiment of the present invention.

[0046] Figure 10This is a front view of a single-axis multi-layer shear drill bit employing multiple sets of the slit-type uniformly distributed atomizing and stirring spray structure of the present invention, according to a preferred embodiment of the present invention.

[0047] Figure 11 This is a schematic diagram of a dual-axis unidirectional rotating drill bit structure using the slotted uniform atomization stirring spray structure of the present invention, according to a preferred embodiment of the present invention.

[0048] Figure 12 This is a schematic diagram of a three-axis unidirectional rotating drill bit structure using the slotted uniform atomization stirring spray structure of the present invention, according to a preferred embodiment of the present invention.

[0049] In the diagram: 1. Center drill pipe; 101. Medium channel; 2. Atomizing injection unit; 3. Slurry drainage channel; 4. Gas drainage channel; 401. One-way valve; 5. Atomizing injector; 501. Slurry chamber area; 502. Slurry nozzle; 503. Gas chamber area; 504. Gas nozzle; 505. Mixing chamber area; 506. Mixing nozzle; 6. Cutting blade; 7. Stationary blade; 8. Agitating blade; 9. Drill pipe joint; 10. Cutting teeth. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] like Figures 1 to 6As shown, a slotted uniform atomizing spray structure includes: a drill bit center rod and a cutting wing plate 6. The cutting wing plate 6 is arranged radially along the drill bit center rod. A medium channel 101 is provided inside the drill bit center rod. The medium channel 101 includes a slurry medium channel 101 and a gas medium channel 101. An atomizing spray unit 2 is provided on the cutting wing plate 6. The atomizing spray unit 2 includes a slurry diversion channel 3, a gas diversion channel 4, and an atomizing injector 5. One end of both the slurry diversion channel 3 and the gas diversion channel 4 is connected to the atomizing injector 5, and the other end is connected to the slurry medium channel 101 and the gas medium channel 101, respectively. The system should be interconnected. By integrating the slurry medium channel 101 and the gas medium channel 101 inside the drill bit center rod, and setting the atomizing spray unit 2 on the excavation wing plate 6, the integrated operation of "excavation-atomizing spray-medium mixing" can be achieved. No additional external spraying device is required. The airflow carries the solidifying agent slurry and other fluids at high speed and sprays them out to collide and scour the in-situ soil within the radius. This causes the in-situ soil structure to be broken up, the soil blocks to be crushed, and the cohesion between the broken soil or soil particles to be greatly weakened. The fluidity of the soil is significantly enhanced, which in turn greatly reduces the soil resistance when the drill bit rotates, advances, and is lifted.

[0054] Preferably, the atomizing spray unit 2 includes two forms: a single-sided atomizing spray unit 2 and a double-sided atomizing spray unit 2. The atomizing spray unit 2 has multiple performance forms, and the number of channels and the arrangement of spray units can be flexibly selected according to the construction pile diameter, stratum type, selected stirring and spraying drill bit and stirring process, so as to solve the technical pain point that a single structure is difficult to adapt to complex construction scenarios.

[0055] The atomizing jet injector 5 includes a slurry chamber 501, a slurry nozzle 502, a gas chamber 503, a gas nozzle 504, a mixing chamber 505, and a mixing nozzle 506. The slurry chamber 501, the gas chamber 503, and the mixing chamber 505 are all flat and elongated cavity structures. The slurry nozzle 502, the gas nozzle 504, and the mixing nozzle 506 are slit-shaped structures. The inclined design of the slurry inlet projection area of ​​the slurry chamber 501 replaces the traditional right-angle connection with "inclined reflection guidance", avoiding the sudden drop in kinetic energy caused by the frontal impact of the fluid. This allows the slurry and gas to be ejected at a higher speed, which not only enhances the impact effect but also reduces the risk of channel blockage. It does not rely on traditional complex solutions such as "increasing the spraying pressure and increasing the cement content" or "four-stirring and two-spraying / multiple-stirring and multiple-spraying". Uniform mixing can be achieved with just a single atomizing jet structure, reducing construction costs and operational complexity.

[0056] Preferably, the opening width of the grout nozzle 502 increases along its length, which is beneficial for distributing the grout flow rate within the radius of the pile body, so as to achieve a more consistent amount of grout added at each point of the pile body cross section, and ultimately reduce the coefficient of variation of the solidified soil strength. The grout nozzle 502 is located above the gas nozzle 504. The grout sinks due to gravity, and the gas is ejected from below, which is more conducive to the mixing of grout and gas.

[0057] Preferably, the total width of the coverage range of the mixed nozzle 506 ejected along the length direction of the excavation wing plate 6 is L1, the length of the excavation wing plate 6 is L2, and L1 and L2 satisfy the relationship: 0.8×L2 ≤ L1 ≤ L2. By designing the atomizing injector 5 as a flat and long cavity, and designing the slurry nozzle 502, the gas nozzle 504, and the mixed nozzle 506 as slit nozzles, combined with the coverage range 0.8×L2 ≤ L1 ≤ L2 of the mixed nozzle 506 along the length of the excavation wing plate 6, the curing agent slurry is atomized and evenly spread within the pile body radius range, avoiding the problem of "central aggregation and peripheral sparsity" caused by traditional central rod grouting, greatly reducing the coefficient of variation of the forming strength at each point in the same cross-section of the pile body, making the overall strength of the solidified soil meet the design standard, and reducing the engineering safety hazards caused by uneven strength.

[0058] Preferably, the opening area of the mixed nozzle 506 is A1, the opening area of the slurry nozzle 502 is A2, and the opening area of the gas nozzle 504 is A3. The relationship among the three is: A1 < A2 + A3. The design that the opening area A1 of the mixed nozzle 506 is less than the sum of the opening area A2 of the slurry nozzle 502 and the opening area A3 of the gas nozzle 504 not only ensures the outlet pressure to enhance the impact effect, but also precisely distributes the slurry flow within the pile body radius range through non-uniform width nozzle structures such as "trapezoidal slit" (the opening width of the slurry nozzle 502 and the mixed nozzle 506 increases along the length direction), avoiding material waste caused by the slurry spraying beyond the pile diameter. At the same time, the outlet of the mixing chamber area 505 becomes narrower, which is beneficial to further increase the outlet pressure, increase the slurry and gas flow velocities, enhance the impact or scouring effect on the soil, facilitate uniform mixing, and also prevent the external soil from flowing into the cavity.

[0059] Preferably, the inner wall of the slurry chamber area 501 in the projection area of the slurry inlet is an inclined plane, and there is an included angle between the direction of the inclined plane and the direction of the slurry flow. Preferably, the included angle between the direction of the inclined plane and the direction of the slurry flow is θ, and the range of the θ interval is 30° ≤ θ ≤ 60°. By controlling the included angle between the inclined plane in the projection area of the slurry inlet of the slurry chamber area 501 and the slurry flow direction within 30° - 60°, replacing the traditional right-angle connection with "inclined plane guidance", it not only avoids the sudden drop in kinetic energy caused by the slurry directly impacting the cavity wall, but also guides the slurry to smoothly enter the cavity area along the inclined plane, reducing the risk of slurry deposition at the slurry inlet, and at the same time improving the mixing efficiency of the slurry and the gas.

[0060] As Figure 1-3 shown, the shape of the single-side atomizing unit is:

[0061] A medium channel 101 is provided inside the drill bit center rod. The medium channel 101 includes several slurry medium channels 101 and several gas medium channels 101. A set of atomizing injection units 2 is provided on the cutting wing plate 6 on one side of the drill bit center rod. The slurry chamber area 501 is located above the gas chamber area 503. The slurry nozzle 502 is located above the gas nozzle 504. One end of the slurry diversion channel 3 and the gas diversion channel 4 are connected to the atomizing injector 5. One end of each of the slurry diversion channel 3 and the gas diversion channel 4 is connected to the atomizing injector 5. The other end is connected to the slurry medium channel 101 and the gas medium channel 101 respectively. The atomizing injector 5 is located below the cutting wing plate 6. The slit structure of the mixing nozzle 506 is a trapezoidal slit structure. A one-way valve 401 is provided at the end of the gas diversion channel 4.

[0062] Example 1

[0063] like Figure 7 As shown, a unidirectional jet grouting drill bit employing the single-sided atomizing unit of the slotted uniform atomizing jet grouting structure of the present invention includes a drill bit center rod, a medium channel 101, an atomizing jetting unit 2, stationary blades 7, a stirring vane, and a drill rod joint 9. The center rod has a diameter of 110 mm, the stirring vane has a length of 295 mm, and the diameter of the jet grouting pile constructed using this drill bit is 700 mm.

[0064] The drill bit features a uniformly distributed atomizing and stirring structure with a single-sided atomizing unit, as shown in the example. Figure 1 As shown. An atomizing injection unit 2 is provided radially on the drill bit's center rod. The atomizing injection unit 2 includes a slurry drainage channel 3, a gas drainage channel 4, an atomizing injector 5, and a cutting flange 6, the length of which is also 295mm. One end of the slurry drainage channel 3 and the air drainage channel communicates with the atomizing injector 5, and the other end communicates with several media channels 101 provided on the center drill rod 1. The cutting flange 6 is fixed to the outer wall of the drill bit's center rod, and the atomizing injector 5 is located below the cutting flange 6. The atomizing injector 5 includes a slurry chamber area 501, a slurry nozzle 502, a gas chamber area 503, a gas nozzle 504, a mixing chamber area 505, and a mixing nozzle 506. The mixing nozzle 506 has a trapezoidal opening shape along its length.

[0065] The outlet pressure at the slurry nozzle 502 is set to 0.5 MPa, and the outlet pressure at the gas nozzle 504 is set to 1.0 MPa.

[0066] A one-way valve 401 is installed at the end of the air diversion channel to prevent the solidified slurry from entering the gas channel and clogging or contaminating the pipeline in the event of pressure runaway.

[0067] The opening area of ​​the mixing nozzle 506 is A1=1200. The opening area of ​​the slurry nozzle 502 is A2=900. , the opening area of the gas nozzle 504 is A3 = 1800 , and the relationship among the three is: A1 < A2 + A3. The outlet of the mixing chamber area 505 becomes narrower, which is beneficial to further increase the outlet pressure, increase the flow velocity of the slurry and gas, enhance the impact or scouring effect on the soil body, facilitate uniform mixing, and at the same time prevent the external soil body from flowing into the cavity.

[0068] The opening shape of the slurry nozzle 502 along the length direction is trapezoidal.

[0069] The slurry nozzle 502 is located above the gas nozzle 504. Due to the gravity effect, the slurry will sink, and the gas is ejected from below it, which is more conducive to the mixing of the slurry and gas.

[0070] The inner wall of the slurry chamber area 501 in the projection area of the slurry inlet is an inclined surface, and the included angle between the inclined surface direction and the slurry inflow direction is 45°. The directions of the solidified slurry and the gas before entering the atomizing injector 5 respectively and the direction of the slurry-gas mixture state ejected from the atomizing injector 5 are all perpendicular. Different from the conventional right-angle connection, the inclined surface reflection guiding method is adopted, with small fluid kinetic energy loss, faster ejection speed, not easy to form channel blockage, and better ejection impact effect.

[0071] The length of the excavation wing plate 6 is 295 mm, and the total width of the coverage range of the mixed nozzle 506 ejected along the length direction of the excavation wing plate 6 is 240 mm, accounting for 81.4% of the length of the excavation wing plate 6.

[0072] The usage method of applying this drill bit with a slit-type uniformly distributed atomizing stirring and spraying structure includes the following steps:

[0073] S1. When the mixing pile machine starts construction, the drill rig background starts to supply the solidified material slurry and starts the air compressor to transport compressed air. The slurry and air enter the medium channels 101 of the drill bit center rod respectively, further flow into the slurry drainage channel 3 and the gas drainage channel 4, and then enter the atomizing injector 5 respectively. After being atomized and ejected through the mixed nozzle 506 in the atomizing injector 5, it indicates that the background supply is normal and no blockage occurs in each channel, and the next step can be carried out;

[0074] S2. The drill bit begins to drill down, and the cutting teeth 10 on the cutting blade 6 contact the soil, loosening it. Then, through the action of the cutting blade 6, it provides upward and forward forces to the soil in front of the blade, achieving further excavation and disturbance of the soil. At the same time, the atomizing injector 5 continuously sprays a mist-like slurry mixture, impacting and refining the soil in front of the nozzle. In this way, the solidifying material slurry is evenly spread in the dispersed soil, making the soil more fluid. When the upper mixing blade 8 reaches the position of the slurry-mixed soil, it further mixes the soil containing slurry until it is uniform. When the drill bit reaches the bottom elevation of the pile, the pile body is already relatively uniformly mixed with the solidifying agent slurry and has undergone one mixing. Thus, the spraying and mixing construction is completed.

[0075] S3. Turn off the slurry delivery in the background, and continue or stop the gas delivery. The drill bit will start to reverse and lift, and the cement and soil in the pile body will be stirred again, increasing the uniformity. When the drill bit is lifted off the ground, the mixing and spraying construction is completed. If necessary, the above steps can be repeated once to complete the two spraying and four mixing construction. After the construction is completed, the background pump will pump clean water to flush out the residual slurry or residue in the drill rod, drill bit center rod and grouting channel.

[0076] The uniaxial solidified soil pile constructed using this drill bit and its application method has a series of advantages, including strong construction penetration, high pile length guarantee rate, less likelihood of getting stuck or clogging the drill bit, high construction efficiency, good pile uniformity, and high solidification strength.

[0077] Example 2

[0078] like Figure 11 As shown, a dual-axis atomizing drill bit employing the single-sided atomizing unit of the slotted uniform atomizing and spraying structure of the present invention includes two sets of drill bit center rods arranged in parallel, a medium channel 101, an atomizing and spraying unit 2, stationary blades 7, a stirring vane, and a drill rod joint 9.

[0079] The drill bit features a uniformly distributed atomizing and stirring structure with a single-sided atomizing unit, as shown in the example. Figure 2 As shown. The atomizing injectors 5 are all located under the excavating blades 6 on one side of the drill bit's center rod. The stationary blades 7 are fixed to the two drill bit center rods using a dual-axis connection. The installation height of each layer of mixing blades on the two drill bit center rods is consistent, and there is a certain overlap in their rotational coverage area. The overlap width is 200mm. During initial installation, they need to be staggered at a certain angle to prevent rotational collisions. The center rod diameter is 110mm, the mixing blade length is 370mm, and the diameter of the jet grouting pile constructed using this drill bit is 850mm.

[0080] Each atomizing injection unit 2 includes a slurry drainage channel 3, a gas drainage channel 4, an atomizing injector 5 and an excavation wing plate 6. One end of the slurry drainage channel 3 and the air drainage channel communicates with the atomizing injector 5, and the other end communicates with a number of medium channels 101 provided on the drill bit center rod correspondingly. The excavation wing plate 6 is fixed on the outer wall of the drill bit center rod, and the atomizing injector 5 is located below the excavation wing plate 6. The atomizing injector 5 includes a slurry chamber area 501, a slurry nozzle 502, a gas chamber area 503, a gas nozzle 504, a mixing chamber area 505 and a mixing nozzle 506. The opening shape of the mixing nozzle 506 along the length direction is trapezoidal.

[0081] The outlet pressure at the slurry nozzle 502 is set to be 0.8 MPa, and the outlet pressure at the gas nozzle 504 is 1.0 MPa.

[0082] A one-way valve 401 is provided at the end of the air drainage channel. This prevents the solidified slurry from entering the gas channel and blocking and polluting the pipeline in case of pressure out-of-control.

[0083] The opening area A1 of the mixing nozzle 506 = 1200 and the opening area A2 of the slurry nozzle 502 = 900 and the opening area A3 of the gas nozzle 504 = 1800 The relationship among the three is: A1 < A2 + A3. The outlet of the mixing chamber area 505 becomes narrower, which is beneficial to further increase the outlet pressure, increase the slurry and gas flow rates, enhance the impact or scouring effect on the soil body, facilitate uniform mixing, and at the same time prevent the external soil body from surging into the chamber.

[0084] The opening shape of the slurry nozzle 502 along the length direction is also trapezoidal.

[0085] The slurry nozzle 502 is located above the gas nozzle 504. Due to the gravity effect, the slurry will sink, and the gas is ejected from below it, which is more conducive to the mixing of the slurry and gas.

[0086] The inner wall of the slurry chamber area 501 in the projection area of the slurry inlet is an inclined plane, and the included angle between the inclined plane direction and the slurry flow-in direction is 45°. The directions of the solidified slurry and the gas before entering the atomizing injector 5 respectively, and the direction of the slurry-gas mixture state ejected from the atomizing injector 5 are all perpendicular. Different from the conventional right-angle connection, the inclined plane reflection guiding method is adopted, with small fluid kinetic energy loss, faster ejection speed, not easy to form channel blockage and better ejection impact effect.

[0087] The length of the excavation wing plate 6 is 370 mm, and the total width of the spraying coverage range of the mixing nozzle 506 along the length direction of the excavation wing plate 6 is 320 mm, accounting for 86% of the length of the excavation wing plate 6.

[0088] The method of using the biaxial atomizing and agitating drill bit with this slotted uniform atomizing and agitating structure is the same as in Example 1 and will not be repeated here. It should be noted that the rotation speed of the left and right drill bits must be consistent.

[0089] The biaxially solidified soil pile constructed using this drill bit and its application method has a series of advantages, including strong construction penetration, high pile length guarantee rate, less likelihood of getting stuck or clogging the drill bit, high construction efficiency, good pile uniformity, high solidification strength, and good water-stopping performance.

[0090] Example 3

[0091] like Figure 12 As shown, a triaxial atomizing drill bit employing the single-sided atomizing unit of the slotted uniform atomizing and spraying structure of the present invention includes three sets of drill bit center rods arranged in parallel, a medium channel 101, an atomizing and spraying unit 2, a stirring blade, and a drill rod joint 9.

[0092] The drill bit features a uniformly distributed atomizing and stirring structure with a single-sided atomizing unit, as shown in the example. Figure 3 As shown, the atomizing injectors 5 are all located under the cutting wing plate 6 on one side of the drill bit center rod, and their horizontal projection is completely covered by the horizontal projection of the cutting wing plate 6.

[0093] The mixing blades on the three drill bit center rods are installed at staggered heights to prevent rotational collisions. There is a certain overlap in the rotation coverage of adjacent mixing blades, with an overlap width of 200mm. The center rod diameter is 110mm, the mixing blade length is 370mm, and the diameter of the jet grouting pile constructed using this drill bit is 850mm.

[0094] The other features of this drill bit are basically the same as those in Example 2, and its usage method is the same as that in Example 1, so they will not be described in detail here.

[0095] like Figure 4-5 As shown, the morphology of the dual-sided atomizing element is as follows:

[0096] The drill bit center rod is provided with a medium channel 101, which includes several slurry medium channels 101 and several gas medium channels 101. There are two sets of atomizing injection units 2, which are respectively set on the cutting flanges 6 on both sides of the drill bit center rod. The slurry chamber area 501 is set above the gas chamber area 503. The slurry nozzle 502 is located above the gas nozzle 504. One end of the slurry diversion channel 3 and the gas diversion channel 4 are connected to the atomizing injector 5. One end of each of the slurry diversion channel 3 and the gas diversion channel 4 is connected to the atomizing injector 5, and the other end is connected to the slurry medium channel 101 and the gas medium channel 101 respectively. The atomizing injector 5 is located below the cutting flange 6. The slit structure of the mixing nozzle 506 is a trapezoidal slit structure. A one-way valve 401 is set at the end of the gas diversion channel 4. The cutting flanges 6 on both sides of the drill bit center rod include cutting flanges 6 on both sides of the same straight line or cutting flanges 6 on both sides of the vertical direction.

[0097] Example 4

[0098] like Figure 8 As shown, a unidirectional large-diameter jet grouting drill bit employing the double-sided atomizing unit of the slotted uniformly distributed atomizing jet grouting structure of this invention includes a drill bit center rod, a medium channel 101, an atomizing jet unit 2, stationary blades 7, stirring blades, and a drill rod joint 9. The atomizing jet unit 2 consists of two sets. One set of atomizing jet unit 2 includes straight cutting blades 6 located on the upper layer, while the other set includes spiral cutting blades 6 located on the lower layer. The center rod has a diameter of 180 mm, the stirring blades have a length of 660 mm, and the diameter of the jet grouting pile constructed using this drill bit is 1500 mm.

[0099] This drill bit features a uniformly distributed atomizing and stirring spray structure with dual-sided atomizing units, as shown in the image. Figure 4 As shown. Each atomizing injection unit 2 includes a slurry drainage channel 3, a gas drainage channel 4, an atomizing injector 5, and a cutting wing plate 6. One end of the slurry drainage channel 3 and the air drainage channel is connected to the atomizing injector 5, and the other end is independently connected to several media channels 101 provided on the drill bit center rod. The cutting wing plate 6 is fixed on the outer wall of the drill bit center rod, and the atomizing injector 5 is located below the cutting wing plate 6. The atomizing injector 5 includes a slurry chamber area 501, a slurry nozzle 502, a gas chamber area 503, a gas nozzle 504, a mixing chamber area 505, and a mixing nozzle 506. The mixing nozzle 506 has a trapezoidal opening shape along its length.

[0100] The outlet pressure at slurry nozzle 502 is set at 0.8 MPa, and the outlet pressure at gas nozzle 504 is set at 1.0 MPa.

[0101] A one-way valve 401 is installed at the end of the air diversion channel to prevent the solidified slurry from entering the gas channel and clogging or contaminating the pipeline in the event of pressure runaway.

[0102] The opening area A1 of the mixing nozzle 506 in the upper atomizing injection unit 2 is 1400 , and the opening area A2 of the slurry nozzle 502 is 1000 , and the opening area A3 of the gas nozzle 504 is 2000 , and the relationship among the three is: A1 < A2 + A3. The opening area A1 of the mixing nozzle 506 in the lower atomizing injection unit 2 is 1100 , the opening area A2 of the slurry nozzle 502 is 800 , and the opening area A3 of the gas nozzle 504 is 1600 , and the relationship among the three is: A1 < A2 + A3. The outlet of the mixing cavity area 505 becomes narrower, which is beneficial to further increase the outlet pressure, increase the slurry and gas flow velocities, enhance the impact or scouring effect on the soil body, facilitate uniform mixing, and at the same time prevent the external soil body from flowing into the cavity.

[0103] The opening shapes of the slurry nozzles 502 along the length direction are all trapezoidal.

[0104] The slurry nozzle 502 is located above the gas nozzle 504. Due to the gravity effect, the slurry will sink, and the gas is ejected from below it, which is more conducive to the mixing of slurry and gas.

[0105] The inner wall of the slurry cavity area 501 in the projection area of the slurry inlet is an inclined plane, and the included angle between the inclined plane direction and the slurry flow-in direction is 45°. The directions of the solidified slurry and the gas before entering the atomizing injector 5 and the direction of the slurry-gas mixture state ejected from the atomizing injector 5 are all perpendicular. Different from the conventional right-angle connection, the inclined plane reflection guiding method is adopted, with small fluid kinetic energy loss, faster ejection speed, not easy to form channel blockage, and better ejection impact effect.

[0106] The length of the excavation wing plate 6 is 660 mm, the opening width of the upper nozzle is 400 mm, the total width of the coverage range ejected along the length direction of the lower excavation wing plate 6 is 200 mm, there is a 20-mm overlap in the rotation ring coverage area between the two, and the total coverage width is 580 mm, accounting for 89% of the length of the excavation wing plate 6.

[0107] The usage method of the unidirectional large-diameter mixing and spraying drill bit applying this seam-type uniformly distributed atomizing mixing and spraying structure is the same as that in Embodiment 1. It should be noted that: the actions of the two groups of atomizing injectors 5 should be kept consistent.

[0108] Using this drill bit and the usage method, ultra-large-diameter single-axis solidified soil piles with a diameter of more than 1.5 m can be constructed, and it has a series of advantages such as strong construction penetration, high pile length guarantee rate, not easy to get stuck or paste the drill, high construction efficiency, good pile body uniformity, and high solidification strength.

[0109] Embodiment 5

[0110] As shown Figure 9-10 in the figure, a bidirectional cross-cut stirring and spraying drill bit adopting the double-side atomization unit of the stitch-type evenly distributed atomization and stirring spraying structure of the present invention includes a drill bit center rod, a medium channel 101, an atomization spraying unit 2, stirring wing plates, and a drill pipe joint 9. Among them, there are two groups of atomization spraying units 2, and the excavation wing plates 6 included in the two groups of atomization spraying units 2 are both straight plates, which are respectively located on both sides of the drill bit center rod. The stirring wing plates are divided into horizontal stirring wing plates and vertical stirring wing plates. Under the respective drives of the inner and outer drill pipes, a cross-cutting effect is formed between the stirring wing plates.

[0111] The diameter of the center rod is 180 mm, the length of the stirring wing plates is 660 mm, and the diameter of the stirring and spraying pile constructed by using this drill bit is 1500 mm.

[0112] The double-side atomization unit of the stitch-type evenly distributed atomization and stirring spraying structure of this drill bit is as shown Figure 5 in the figure. The atomization spraying unit 2 is provided on the radial direction of the drill bit center rod. Each group of atomization spraying unit 2 includes a slurry drainage channel 3, a gas drainage channel 4, an atomization sprayer 5, and an excavation wing plate 6. One end of the slurry drainage channel 3 and the air drainage channel is communicated with the atomization sprayer 5, and the other end is correspondingly communicated with a plurality of medium channels 101 provided on the drill bit center rod. The air drainage channels on both sides of the drill bit center rod are connected to the same medium channel 101 for gas transportation. The excavation wing plate 6 is fixed on the outer wall of the drill bit center rod, and the atomization sprayer 5 is located below the excavation wing plate 6. The atomization sprayer 5 includes a slurry chamber area 501, a slurry spray port 502, a gas chamber area 503, a gas spray port 504, a mixing chamber area 505, and a mixing spray port 506. The opening shape of the mixing spray port 506 along the length direction is trapezoidal.

[0113] The outlet pressure at the slurry spray port 502 is set to 0.8 MPa, and the outlet pressure at the gas spray port 504 is 1.0 MPa.

[0114] A one-way valve 401 is provided at the end of the air drainage channel to prevent the solidified slurry from entering the gas channel and blocking and polluting the pipeline in case of pressure out-of-control.

[0115] The opening area A1 of the mixing spray port 506 in one side atomization spraying unit 2 is 1400 , the opening area A2 of the slurry spray port 502 is 1000 , and the opening area A3 of the gas spray port 504 is 2000 . The relationship among the three is: A1 < A2 + A3. The opening area A1 of the mixing spray port 506 in the other side atomization spraying unit 2 is 1100 , the opening area A2 of the slurry spray port 502 is 800 , and the opening area A3 of the gas spray port 504 is 1600 , The relationship among the three is: A1 < A2 + A3. The narrowing of the outlet of the mixing cavity area 505 is beneficial to further increase the outlet pressure, increase the flow rates of the slurry and the air flow, enhance the impact or scouring effect on the soil body, facilitate uniform mixing, and at the same time prevent the external soil body from flowing into the cavity.

[0116] The opening shapes of the slurry nozzles 502 along the length direction are all trapezoidal.

[0117] The slurry nozzles 502 are located above the gas nozzles 504. Due to the gravity effect, the slurry will sink, and the gas is ejected from below it, which is more conducive to the mixing of the slurry and the gas.

[0118] The inner wall of the slurry cavity area 501 in the projection area of the slurry inlet is an inclined plane, and the included angle between the inclined plane direction and the slurry inflow direction is 30°. The directions of the solidified slurry and the gas before entering the atomizing injector 5 respectively and the direction of the slurry-gas mixture ejected from the atomizing injector 5 are all perpendicular. Different from the conventional right-angle connection, the inclined plane reflection guiding method is adopted, with small fluid kinetic energy loss, faster ejection speed, not easy to form channel blockage, and better ejection impact effect.

[0119] The length of the excavation wing plate 6 is 660 mm, the opening width of the upper layer nozzle is 400 mm, the total width of the coverage range ejected along the length direction of the excavation wing plate 6 in the lower layer is 200 mm, there is a 20-mm overlap in the rotation ring coverage area between the two, and the total coverage width is 580 mm, accounting for 89% of the length of the excavation wing plate 6.

[0120] The usage method of the one-way large-diameter mixing and jetting drill bit applying this slit-type uniformly distributed atomizing mixing and jetting structure is the same as that of Embodiment 1. It should be noted that: the actions of the two groups of atomizing injectors 5 should be kept consistent.

[0121] Using this drill bit and its usage method, ultra-large-diameter and ultra-deep single-axis solidified soil piles with a pile length exceeding 40 m and a diameter above 1.5 m can be constructed, and it has a series of advantages such as strong construction penetration, high pile length guarantee rate, not easy to get stuck or paste the drill, high construction efficiency, good pile body uniformity, and high curing strength.

[0122] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made. These are all equivalent modifications and evolutions made to the above embodiments based on the essential technology of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A slit-type uniform distribution atomizing spray structure comprising: A drill bit center rod and a digging wing plate radially arranged on the drill bit center rod, characterized in that a medium channel is arranged in the drill bit center rod, and the medium channel comprises a slurry medium channel and a gas medium channel; An atomizing injection unit is arranged on the digging wing plate, and the atomizing injection unit comprises a slurry flow channel, a gas flow channel and an atomizing injector, one end of the slurry flow channel and the gas flow channel is communicated with the atomizing injector, and the other end is communicated with the slurry medium channel and the gas medium channel correspondingly; The atomizing injector comprises a slurry cavity area, a slurry nozzle, a gas cavity area, a gas nozzle and a mixing cavity area and a mixing nozzle, the slurry cavity area, the gas cavity area and the mixing cavity area are all oblong cavity structures, and the slurry nozzle, the gas nozzle and the mixing nozzle are slit structures; The inner wall of the slurry cavity area in the slurry inlet projection area is a slope, and the slope direction and the slurry flow direction have an included angle.

2. The slit-shaped uniform distribution atomizing injection structure according to claim 1, characterized in that: The opening width of the slurry nozzle along the length direction has an increasing trend.

3. The slit-shaped uniform distribution atomizing injection structure according to claim 1, characterized in that: The slurry nozzle is located above the gas nozzle.

4. The slit-shaped uniform distribution atomizing injection structure according to claim 1, characterized in that: The included angle between the slope direction and the slurry flow direction is θ, and the θ interval range is 30°≤θ≤60°.

5. The slit-shaped uniform distribution atomizing injection structure according to claim 1, characterized in that: The total width of the mixing nozzle along the length direction of the digging wing plate is L1, the length of the digging wing plate is L2, and the L1 and L2 satisfy the relationship: 0.8×L2≤L1≤L2.

6. The slit-shaped uniform distribution atomizing injection structure according to claim 1, characterized in that: The opening area of the mixing nozzle is A1, the opening area of the slurry nozzle is A2, and the opening area of the gas nozzle is A3, and the relationship among them is: A1<A2+A3.

7. The slit-shaped uniform distribution atomizing injection structure according to claim 1, characterized in that: The atomizing injection unit comprises a single-side atomizing injection unit and a double-side atomizing injection unit.

8. The slit-shaped uniform distribution atomizing injection structure according to claim 7, characterized in that: The single-side atomizing injection unit form is: A medium channel is arranged in the drill bit center rod, and the medium channel comprises a plurality of slurry medium channels and a plurality of gas medium channels; A group of atomizing injection units are arranged on the digging wing plate on one side of the drill bit center rod; The slurry cavity area is arranged above the gas cavity area, and the slurry nozzle is located above the gas nozzle; One end of the slurry flow channel and the gas flow channel is communicated with the atomizing injector, the other end of the slurry flow channel and the gas flow channel is communicated with the slurry medium channel and the gas medium channel correspondingly, and the atomizing injector is located below the digging wing plate, and the slit structure of the mixing nozzle is a trapezoidal slit structure; A one-way valve is arranged at the end of the gas flow channel.

9. The slit-shaped uniform distribution atomizing injection structure according to claim 7, characterized in that: The double-side atomizing injection unit form is: A medium channel is arranged in the drill bit center rod, and the medium channel comprises a plurality of slurry medium channels and a plurality of gas medium channels; The atomizing injection unit is 2 groups, which are arranged on the digging wing plate on both sides of the drill bit center rod; The slurry cavity area is arranged above the gas cavity area, and the slurry nozzle is located above the gas nozzle; The slurry flow channel and the gas flow channel are communicated with the atomizing injector at one end, both communicated with the atomizing injector at one end and communicated with the slurry medium channel and the gas medium channel at the other end, and the atomizing injector is located below the digging wing plate, and the slit structure of the mixed nozzle is a trapezoidal slit structure. A one-way valve is arranged at the end of the gas flow channel.

10. The slit-shaped uniform distribution atomizing injection structure according to claim 9, characterized in that: The digging wing plates on both sides of the drill bit central rod include the digging wing plates on both sides of the same straight line or the digging wing plates on both sides in the up-down direction.

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