A porous uniform distribution atomizing spray structure and a design method thereof

Abstract

The application discloses a porous uniform distribution atomization spraying structure and a design method thereof, which comprises a drill center rod and a digging wing plate, the drill center rod is internally provided with a medium channel, the digging wing plate is provided with an atomization spraying unit, and the atomization spraying unit is communicated with the medium channel; the medium channel comprises a slurry medium channel and a gas medium channel, the atomization spraying unit comprises a slurry drainage channel, a gas drainage channel, a switching channel, a confluence spraying channel and an atomization spraying port; one end of the slurry drainage channel is communicated with the slurry medium channel, one end of the gas drainage channel is communicated with the gas medium channel, one end of the switching channel is communicated with a free end of the slurry drainage channel or a free end of the gas medium channel, and the other end of the switching channel is communicated with the confluence spraying channel; the atomization spraying port is arranged at a free end of the confluence spraying channel, the atomization spraying port is located below the digging wing plate, and the spraying structure has multiple performance forms.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of foundation treatment and jetting equipment, in particular to a porous uniform distribution atomizing jetting structure and a design method thereof. BACKGROUND

[0002] As a major method in the field of foundation treatment engineering technology, deep mixing pile technology has been widely used in the field of engineering construction since the 1960s, including civil engineering, construction engineering, railway engineering, highway engineering, water conservancy engineering, municipal engineering and port engineering. Deep mixing pile engineering technology uses single shaft or multi-shaft mixing drill to input cement and other solidifying agents into the ground, and through mixing with soft and hard soil, a series of physical and chemical reactions between the solidifying agent and the soil are generated, forming a pile, wall and block with high strength, good water stability and strong impermeability. Thus, the actual engineering problems such as composite foundation bearing capacity, mixing pile bearing capacity, core composite pile bearing capacity, SMW method pile bearing capacity, water resistance wall impermeability, and pollution soil, toxic material landfill sealing wall and sealing layer are effectively solved.

[0003] Due to the advantages of simple drill equipment, efficient construction and low cost, deep mixing pile engineering technology has been widely used in the field of civil construction. However, at present, when designing the mixing pile construction drill, a jetting port is arranged on the center rod of the drill bit to jet the slurry, and the jetted slurry and soil are mixed by the mixing blades to form a mixing pile with a certain diameter. However, the slurry around the center rod of the drill bit is difficult to be evenly mixed by soil mixing and disturbance, and usually the solidifying agent is discharged upward along the gap between the drill and the drill rod, and the solidifying agent is accumulated in some areas, especially in the center area, resulting in that the strength of the peripheral cement soil is much lower than that of the central cement soil, and the overall strength is lower than the design value, which causes serious engineering quality problems and often leads to serious engineering safety problems. Especially when large-diameter and large-depth mixing piles are required in engineering, the mixing drill with conventional or unreasonable jetting port design will have engineering quality and engineering safety risks.

[0004] In addition, based on the conventional slurry outlet mode of the mixing drill bit, the slurry is not evenly distributed in the mixing area, and the soil in the mixing area cannot be completely softened, resulting in that the drill bit encounters a large resistance during rotation, downward and upward processes, which not only increases energy consumption, but also greatly limits the construction footage capacity, making it difficult to pass through the hard stratum and limiting the construction depth.

[0005] In addition, the conventional mixing pile relies on the pressure provided by the grouting pump to send the solidified slurry to the outlet of the drill bit, and due to the friction of the conveying pipeline and the turning of the bend, the flow rate and pressure are significantly reduced when reaching the outlet. When the outlet pressure is small, the slurry cannot disperse the soil, resulting in poor mixing uniformity, uneven distribution of solidified materials, and ineffective use. When the outlet pressure is less than the external water and soil pressure, the outlet is easily blocked and cannot discharge slurry.

[0006] The current civil construction market urgently needs to solve the above engineering technical problems, and some conventional solutions currently available mainly include: 1. Increasing the grouting pressure to use the jet flow to send the slurry to the outside of the pile body, or increasing the cement slurry content to increase the opportunity for mixing uniformity, but these methods require additional equipment or increase the amount of materials, resulting in increased construction costs; 2. Using four mixing and two spraying or multi-mixing and multi-spraying processes to increase the mixing time, which improves the uniformity to a certain extent, but reduces the construction efficiency; 3. Moving the grouting outlet to the mixing blade, or even adding multiple grouting holes to the mixing blade or excavation blade to try to compensate for the design defects of the center rod grouting, which improves the uniformity to a certain extent, but still cannot achieve uniform coverage of the slurry along the radius, or there is a high probability of partial grouting hole blockage during construction. 4. Adding an air path outside the slurry conveying channel to improve the local uniformity to a certain extent, but due to the unreasonable structure design, it is still difficult to effectively achieve uniform distribution of the solidified materials, resulting in a large variation coefficient of the forming strength of each point of the same cross-section of the pile body. Therefore, this problem has not been fundamentally solved in the industry.

[0007] Therefore, a multi-hole uniform distribution atomizing jet structure and its design method are now proposed to solve the above problems. SUMMARY

[0008] The present application overcomes the shortcomings of the prior art and provides a multi-hole uniform distribution atomizing jet structure.

[0009] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows: a multi-hole uniform distribution atomizing jet structure, comprising: a drill bit center rod and an excavation wing plate, a medium channel is arranged in the drill bit center rod, an atomizing jet unit is arranged on the excavation wing plate, and the atomizing jet unit is in communication with the medium channel.

[0010] The medium channel includes a slurry medium channel and a gas medium channel, and the atomizing jet unit includes a slurry drainage channel, a gas drainage channel, an adapter channel, a confluence jet channel, and an atomizing jet port.

[0011] One end of the slurry drainage channel is communicated with the slurry medium channel, one end of the gas drainage channel is communicated with the gas medium channel, one end of the adapter channel is communicated with the free end of the slurry drainage channel or the free end of the gas medium channel, and the other end of the adapter channel is communicated with the confluence jet channel;

[0012] The atomizing jet port is arranged at the free end of the confluence jet channel, and the atomizing jet port is located below the excavation wing plate.

[0013] The jet structure has multiple performance forms.

[0014] In a preferred embodiment of the present application, the opening cross-sectional area of the atomizing jet port is A1, the flow area of the adapter channel is A2, and the flow area of the confluence jet channel is A3, and the three satisfy the relationship: A1 < A2 + A3.

[0015] In a preferred embodiment of the present application, the opening cross-sectional area of the atomizing jet port in the unit length range along the length direction of the excavation wing plate shows an increasing trend.

[0016] In a preferred embodiment of the present application, the multiple performance forms include form one.

[0017] The medium channel includes one slurry medium channel and one gas medium channel.

[0018] The atomizing jet unit includes one slurry drainage channel, one gas drainage channel, three adapter channels, three confluence jet channels, and three atomizing jet ports, and the atomizing jet port is a circular structure.

[0019] The slurry medium channel is communicated with the slurry drainage channel, and the gas medium channel is communicated with the gas drainage channel.

[0020] One end of the three adapter channels is communicated with the gas drainage channel, and the other end is communicated with the three confluence jet channels, respectively, the three confluence jet channels are all communicated with the slurry drainage channel, and the three atomizing jet ports are arranged at the free ends of the three confluence jet channels, respectively.

[0021] A one-way valve is arranged at the connection position of the gas drainage channel and the gas medium channel.

[0022] In a preferred embodiment of the present application, the multiple performance forms include form two.

[0023] The medium channel includes two slurry medium channels and two gas medium channels.

[0024] The atomizing injection unit is 2 groups, which are upper atomizing injection unit and lower atomizing injection unit respectively, 2 slurry medium channels and gas medium channels are communicated with the upper atomizing injection unit and the lower atomizing injection unit respectively, and the upper atomizing injection unit and the lower atomizing injection unit are arranged on the upper and lower drilling wing plates of the drill center rod respectively.

[0025] The upper atomizing injection unit comprises one slurry flow channel, one gas flow channel, two switching channels, two converging injection channels and two atomizing injection ports.

[0026] The slurry medium channel is communicated with the slurry flow channel, and the gas medium channel is communicated with the gas flow channel.

[0027] One end of the two switching channels is communicated with the gas medium channel, and the other end is communicated with the two converging injection channels respectively, the two converging injection channels are both communicated with the slurry flow channel, and the two atomizing injection ports are arranged at the free ends of the two converging injection channels respectively.

[0028] A one-way valve is arranged at the connection position of the gas flow channel and the gas medium channel.

[0029] In a preferred embodiment of the present application, the lower atomizing injection unit comprises one slurry flow channel, one gas flow channel, one switching channel, one converging injection channel and one atomizing injection port.

[0030] The slurry medium channel is communicated with the slurry flow channel, and the gas medium channel is communicated with the gas flow channel.

[0031] One end of the switching channel is communicated with the slurry flow channel, and the other end is communicated with the converging injection channel, the converging injection channel is communicated with the gas flow channel, and the atomizing injection port is arranged at the free end of the converging injection channel.

[0032] A one-way valve is arranged at the connection position of the slurry flow channel and the slurry medium channel.

[0033] In a preferred embodiment of the present application, the various display forms include form three.

[0034] The medium channel comprises one slurry medium channel and two gas medium channels.

[0035] The atomizing injection unit is 2 groups, which are arranged on the drilling wing plates on both sides of the drill center rod, and the atomizing injection unit comprises two slurry flow channels, two gas flow channels, four switching channels, four converging injection channels and four atomizing injection ports.

[0036] The slurry medium channel is a Y-shaped structure, and two slurry flow channels are connected to two free ends of the Y-shaped structure respectively, and two gas medium channels are communicated with two gas flow channels respectively;

[0037] One end of four switching channels is communicated with two slurry flow channels, and the other end is communicated with four converging spray channels respectively, four converging spray channels are communicated with two gas flow channels in a 2-1 corresponding mode respectively, and four atomizing spray ports are arranged at free ends of four converging spray channels respectively;

[0038] Two slurry flow channels and two slurry medium channels are provided with a one-way valve.

[0039] In a preferred embodiment of the present application, a plurality of the performance modes include mode four:

[0040] The medium channel comprises one slurry medium channel and one gas medium channel;

[0041] The atomizing spray unit comprises one slurry flow channel, one gas flow channel, three switching channels, three converging spray channels and three atomizing spray ports, and the atomizing spray port is a flat seam structure;

[0042] The slurry medium channel is communicated with the slurry flow channel, and the gas medium channel is communicated with the gas flow channel;

[0043] One end of three switching channels is communicated with the slurry flow channel, and the other end is communicated with three converging spray channels respectively, three converging spray channels are communicated with the gas flow channel, and three atomizing spray ports are arranged at free ends of three converging spray channels respectively;

[0044] The slurry flow channel and the gas flow channel are both provided with a one-way valve.

[0045] In a preferred embodiment of the present application, a plurality of the performance modes include mode five:

[0046] The medium channel comprises one slurry medium channel and one gas medium channel;

[0047] The atomizing spray unit comprises one slurry flow channel, one gas flow channel, three switching channels, three converging spray channels and three atomizing spray ports, and the atomizing spray port is a circular structure;

[0048] The slurry medium channel is communicated with the slurry flow channel, and the gas medium channel is communicated with the gas flow channel;

[0049] 3 said switching channels one end with the pulp flow channel, the other end through the gas flow channel and each confluence jet channel, the gas flow channel with 3 said confluence jet channel, the switching channel and the confluence jet channel exist part coaxial lap, gas from the ring channel formed by two flow into the confluence jet channel, from the other end of the 3 said atomizing jet port and pulp together with the spray;

[0050] The gas flow channel is provided with a one-way valve.

[0051] Another technical solution adopted by the present application is a porous uniform distribution atomizing jet structure design method, which is used to design the above-mentioned porous uniform distribution atomizing jet structure, comprising the following steps:

[0052] S1, determine the medium channel configuration: according to the construction pile diameter and the stratum characteristics, select the number and connection mode of the slurry medium channel and the gas medium channel, the slurry medium channel and the gas medium channel are used to transport slurry and high-pressure gas respectively;

[0053] S2, design the composition of the atomizing jet unit: based on the medium channel configuration of step S1, determine the number and connection relationship of the slurry flow channel, the gas flow channel, the switching channel, the confluence jet channel and the atomizing jet port in the atomizing jet unit, so that the slurry flow channel is in communication with the slurry medium channel, the gas flow channel is in communication with the gas medium channel, the switching channel connects the slurry flow channel and the confluence jet channel, and the atomizing jet port is arranged at the free end of the confluence jet channel;

[0054] S3, calculate the flow area parameter: set the opening cross-sectional area of the atomizing jet port as A1, the flow area of the switching channel as A2, and the flow area of the confluence jet channel as A3, and ensure that A1 According to the calculation, the A1 of the flat seam-shaped atomizing jet port is calculated according to WxL;

[0055] S4, arrange the atomizing jet port: along the length direction of the drilling wing plate, the opening cross-sectional area shared by the atomizing jet port within a unit length range shows an increasing trend, the opening cross-sectional area S shared by the unit length is ΔA1 / Δx, and Δx satisfies that from the wing plate and the center drill rod connection point to the wing plate outer edge, any position x1

[0056] S5, select the performance form: according to the construction requirement, select the matching structure form from a plurality of performance forms including a plurality of channel number combinations, atomizing jet port shapes and arrangement modes, and set a one-way valve at the connection place of the slurry flow channel and the slurry medium channel or on the gas flow channel.

[0057] The present application solves the defects in the background art, and has the following beneficial effects:

[0058] The present application realizes the integrated operation of "excavation-atomizing injection-medium mixing" by integrating the slurry medium channel and the gas medium channel in the drill bit center rod, setting the atomizing injection unit on the excavation wing plate, without additional external injection device, and the fluid such as the curing agent slurry is sprayed at high speed by the airflow, collides and flushes with the in-situ soil within the radius range, so that the in-situ soil structure is hit and scattered, the soil blocks are crushed, the cohesion between the crushed soil or soil particles is greatly weakened, the fluidity of the soil is significantly enhanced, and the soil resistance during the rotation, footage and lifting of the drilling tool is greatly reduced.

[0059] Meanwhile, the slurry is directly mixed with the high-pressure gas through the converging injection channel, and can be dispersed into small droplets, compared with the traditional injection mode without gas assistance, the contact area between the slurry and the soil is greatly improved, and the uniformity of the curing agent content is improved, and the problem of insufficient local soil reinforcement is avoided.

[0060] In addition, the injection structure has multiple performance forms, and the number of channels and the arrangement mode of the injection unit can be flexibly selected according to the construction pile diameter, the stratum type, the selected stirring injection drill bit and the stirring process, so as to solve the technical pain point that a single structure is difficult to adapt to complex construction scenes. BRIEF DESCRIPTION OF DRAWINGS

[0061] The present application will be further described below in combination with the drawings and embodiments;

[0062] Figure 1 is a performance form of a multi-port uniform atomizing injection structure of a preferred embodiment of the present application, a structure schematic diagram;

[0063] Figure 2 is another performance form of a multi-port uniform atomizing injection structure of a preferred embodiment of the present application, a structure schematic diagram;

[0064] Figure 3 is a performance form two of a multi-port uniform atomizing injection structure of a preferred embodiment of the present application, a structure schematic diagram;

[0065] Figure 4 is a performance form three of a multi-port uniform atomizing injection structure of a preferred embodiment of the present application, a structure schematic diagram;

[0066] Figure 5 is a performance form four of a multi-port uniform atomizing injection structure of a preferred embodiment of the present application, a structure schematic diagram;

[0067] Figure 6 is a performance form five of a multi-port uniform atomizing injection structure of a preferred embodiment of the present application, a structure schematic diagram;

[0068] Figure 7It is a single shaft single direction rotating drill bit structure schematic diagram using the multi-port uniform atomization spray structure performance form one of the application;

[0069] Figure 8 It is a single shaft single direction rotating drill bit structure schematic diagram using the multi-port uniform atomization spray structure performance form two of the application;

[0070] Figure 9 It is a multi-layer mutual shear drill bit structure schematic diagram using the multi-port uniform atomization spray structure performance form three of the application;

[0071] Figure 10 It is another structure schematic diagram of the multi-layer mutual shear drill bit using the multi-port uniform atomization spray structure performance form three of the application;

[0072] Figure 11 It is a double shaft single direction rotating drill bit structure schematic diagram using the multi-port uniform atomization spray structure performance form four of the application;

[0073] Figure 12 It is a three shaft single direction rotating drill bit structure schematic diagram using the multi-port uniform atomization spray structure performance form five of the application.

[0074] In the figure: 1, center drill rod; 10, medium channel; 101, slurry medium channel; 102, gas medium channel; 103, one-way valve; 2, atomization spray unit; 20, slurry drainage channel; 21, gas drainage channel; 22, switching channel; 23, confluence spray channel; 24, atomization spray port; 3, excavation wing plate; 4, stationary blade; 5, stirring blade; 6, drill rod joint; 7, cutting tooth. DETAILED DESCRIPTION

[0075] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0076] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or can be fixed to the other component through another intermediate component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or can be connected to the other component through another intermediate component. When a component is referred to as being "disposed" on another component, it can be directly disposed on the other component or can be disposed on the other component through another intermediate component. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0077] 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 application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0078] As shown in Figures 1-6 A porous uniform distribution atomization spray structure, comprising: a drill center rod and a drilling wing plate 3, a medium channel 10 is arranged in the drill center rod, an atomization spray unit 2 is arranged on the drilling wing plate 3, the atomization spray unit 2 is in communication with the medium channel 10;

[0079] The medium channel 10 comprises a slurry medium channel 101 and a gas medium channel 102, and the atomization spray unit 2 comprises a slurry drainage channel 20, a gas drainage channel 21, a switching channel 22, a confluence spray channel 23 and an atomization spray port 24;

[0080] One end of the slurry drainage channel 20 is in communication with the slurry medium channel 101, one end of the gas drainage channel 21 is in communication with the gas medium channel 102, one end of the switching channel 22 is in communication with the free end of the slurry drainage channel 20 or the free end of the gas medium channel 102, and the other end of the switching channel 22 is in communication with the confluence spray channel 23;

[0081] The slurry is mixed and dispersed into tiny droplets by the high-pressure gas through the confluence spray channel 23 and sprayed out of the atomization spray port 24.

[0082] By integrating the slurry medium channel 101 and the gas medium channel 102 in the drill center rod and arranging the atomization spray unit 2 on the drilling wing plate 3, the integrated operation of "drilling-atomization spray-medium mixing" is realized, without the need for additional external spray devices. The fluid such as the curing agent slurry is sprayed out at high speed by the airflow and collides and flushes with the in-situ soil within the radius, so that the in-situ soil structure is hit and scattered, the soil blocks are crushed, the cohesion between the crushed soil or soil particles is greatly weakened, and the flowability of the soil is significantly enhanced, thereby greatly reducing the soil resistance when the drilling tool rotates, advances and lifts.

[0083] At the same time, the slurry is directly mixed with the high-pressure gas through the confluence spray channel 23 and can be dispersed into tiny droplets. Compared with the traditional spray method without gas assistance, the contact area between the slurry and the soil is greatly improved, thereby improving the uniformity of the curing agent content and avoiding the problem of insufficient local soil reinforcement.

[0084] The spray structure has multiple forms of expression, and the number of channels and the arrangement mode of the spray unit can be flexibly selected according to the construction pile diameter, the stratum type, the selected agitator drill and the mixing process, so as to solve the technical pain points that a single structure is difficult to adapt to complex construction scenes.

[0085] In a preferred embodiment of the present application, the opening cross-sectional area of the atomizing injection port 24 is A1, the flow area of the switching channel 22 is A2, and the flow area of the combined injection channel 23 is A3, which satisfy the relationship: A1 < A2 + A3.

[0086] In underground construction, the external soil pressure of the injection port increases with depth, and the design of A1 < A2 + A3 ensures that the pressure of the mixed medium in the combined channel is always greater than the external soil pressure, forming a positive pressure protection, which greatly reduces the plugging rate of the injection port and reduces the number of construction interruptions.

[0087] At the same time, the total area of A2 and A3 is greater than A1, which can ensure that the gas and slurry form strong shear mixing and complete atomization before reaching A1, avoiding the direct injection of unmixed slurry causing local lack of solidifying agent.

[0088] In a preferred embodiment of the present application, the opening cross-sectional area of the atomizing injection port 24 along the length of the drilling wing plate 3 increases within a unit length range, which is beneficial for the opening area of the injection port to distribute the slurry flow within the radius range of the pile body, so as to achieve consistent solidified slurry mixing amount at each point of the pile body cross-section, and finally reduce the variation coefficient of the solidified soil strength.

[0089] As shown in Figures 1-2 , the performance form one is:

[0090] The medium channel 10 includes one slurry medium channel 101 and one gas medium channel 102, the atomizing injection unit 2 includes one slurry drainage channel 20, one gas drainage channel 21, three switching channels 22, three combined injection channels 23, and three atomizing injection ports 24. The atomizing injection port 24 is circular in structure. The slurry medium channel 101 is in communication with the slurry drainage channel 20, the gas medium channel 102 is in communication with the gas drainage channel 21, one end of the three switching channels 22 is in communication with the gas drainage channel 21, and the other end is in communication with the three combined injection channels 23, respectively. The three combined injection channels 23 are all in communication with the slurry drainage channel 20. The three atomizing injection ports 24 are respectively arranged at the free ends of the three combined injection channels 23. A one-way valve 103 is arranged at the connection between the gas drainage channel 21 and the gas medium channel 102.

[0091] Example 1

[0092] As shown in Figure 7 , a one-way stirring and injection drill bit adopting the performance form one of the multi-port uniform atomizing injection structure of the present application, including a stationary blade 4, a stirring wing plate, and a drill rod joint 6, wherein the center rod diameter is 110 mm, the length of the stirring wing plate is 295 mm, and the stirring and injection pile constructed by using the drill bit has a diameter of 700 mm.

[0093] Along the direction of the extension of the digging wing plate 3, the distance of the three atomizing injection ports 24 from the edge of the drill center rod is 50mm, 150mm, and 250mm in turn, the opening is circular, and the cross-sectional area A1 increases in turn to 200 , 400 , 600 , the corresponding flow area A2 of the three switching channels 22 is 600 , 600 , 600 , and the flow area A3 of the corresponding three converging injection channels 23 is 150 , 300 , 450 , and the relationship between the three is: A1<A2+A3, the outlet of the mixing chamber area is narrowed, which is conducive to further increasing the outlet pressure, increasing the slurry and gas flow rate, and enhancing the impact or scouring effect on the soil, and is easy to mix evenly, while also preventing the external soil from flowing into the chamber.

[0094] The transverse length of the stationary blade 4 is slightly larger than the pile diameter 25mm-30mm, and is arranged between the two layers of stirring blades 5 and between the stirring blades 5 and the digging blade layer, which is beneficial to form a relative shearing effect between the stirring blades 5 and the stationary blades 4, and at the same time, it can separate the stirring blades 5 layer spacing, prevent the soil from adhering to the drill and rotating, and affect the stirring effect.

[0095] Method for use:

[0096] S1, when the mixing pile machine starts construction, the drill machine background starts to supply the solidified material slurry, and at the same time, the air compressor is started to deliver compressed air, the slurry and air enter the medium channel 10 of the drill center rod respectively, the slurry flows into the slurry drainage channel 20, and the gas enters the gas drainage channel 21, the slurry is again drained through the switching channel 22, the gas and the solidified agent slurry are converged in the converging injection channel 23, and are normally atomized and sprayed out through the atomizing injection port 24, which indicates that the background supply is normal, and no blockage occurs in each channel, so the next step can be performed.

[0097] S2, the drill starts to drill, the digging teeth on the digging wing plate 3 contact the soil, loosen the soil, and then provide upward and forward components to the soil in front of the plate through the action of the digging wing plate 3, so as to realize further excavation and disturbance of the soil, at the same time, the atomizing injection port 24 continuously sprays the misty slurry gas mixture to impact and refine the soil in front of the injection port, so that the solidified material slurry is uniformly distributed in the dispersed soil, and the soil becomes more flowable, when the upper stirring blade 5 reaches the position of the slurry-mixed soil, the soil containing slurry is further stirred to be uniform, when the drill reaches the pile bottom elevation, the pile body has been uniformly mixed with the solidified agent slurry, and has been stirred once, thus completing the one-spraying-one-stirring construction;

[0098] S3, the background slurry delivery is closed, the gas delivery continues or stops, the drill bit starts to reverse and lift, the pile body cement soil is stirred again, the uniformity is increased again, when the drill bit is lifted to leave the ground, the stirring and jetting construction is completed, the construction is completed; if necessary, the above steps can be repeated once, the two jetting and four stirring construction is completed; after the construction is completed, the rear pump sends clean water to flush out the residual slurry or residue in the drill pipe, drill bit center rod and jetting channel.

[0099] As Figure 3 shown, the performance form two:

[0100] The medium channel 10 includes 2 slurry medium channels 101 and 2 gas medium channels 102, the atomizing and jetting unit 2 is 2 groups, which are an upper atomizing and jetting unit 2 and a lower atomizing and jetting unit 2, respectively, the 2 slurry medium channels 101 and the gas medium channels 102 are in communication with the upper atomizing and jetting unit 2 and the lower atomizing and jetting unit 2, respectively, the upper atomizing and jetting unit 2 and the lower atomizing and jetting unit 2 are arranged on the upper and lower excavation wing plates 3 of the drill bit center rod, respectively, the upper atomizing and jetting unit 2 includes 1 slurry flow channel 20, 1 gas flow channel 21, 2 switching channels 22, 2 converging jetting channels 23 and 2 atomizing jetting ports 24, the slurry medium channel 101 is in communication with the slurry flow channel 20, the gas medium channel 102 is in communication with the gas flow channel 21, one end of the 2 switching channels 22 is in communication with the gas flow channel 21, and the other end is in communication with the 2 converging jetting channels 23, respectively, the 2 converging jetting channels 23 are both in communication with the slurry flow channel 20, the 2 atomizing jetting ports 24 are arranged at the free ends of the 2 converging jetting channels 23, respectively, and a one-way valve 103 is arranged at the connection between the gas flow channel 21 and the gas medium channel 102.

[0101] The lower atomizing and jetting unit 2 includes 1 slurry flow channel 20, 1 gas flow channel 21, 1 switching channel 22, 1 converging jetting channel 23 and 1 atomizing jetting port 24, the slurry medium channel 101 is in communication with the slurry flow channel 20, the gas medium channel 102 is in communication with the gas flow channel 21, one end of the 1 switching channel 22 is in communication with the slurry flow channel 20, and the other end is in communication with the 1 converging jetting channel 23, respectively, the 1 converging jetting channel 23 is in communication with the gas flow channel 21, the 1 atomizing jetting port 24 is arranged at the free end of the 1 converging jetting channel 23, and a one-way valve 103 is arranged at the connection between the slurry flow channel 20 and the slurry medium channel 101.

[0102] Example 2

[0103] As Figure 8As shown, a one-way large-diameter stirring and jetting drill bit adopting the second performance form of the multi-port uniform distribution atomization jetting structure of the present application comprises a stationary blade 4, stirring blades, a drill rod joint 6, and cutting teeth 7. The upper atomization jetting unit 2 is provided with straight digging blades 3, which are located in the upper layer, and the lower atomization jetting unit 2 is provided with spiral digging blades 3, which are located in the lower layer. The central rod diameter is 180 mm, the length of the stirring blades is 660 mm, and the stirring and jetting pile diameter constructed by using the drill bit is 1500 mm.

[0104] Along the extension direction of the upper straight plate type digging blades 3, the distance of the two atomization jetting ports 24 from the edge of the central rod of the drill bit is 330 mm and 550 mm in sequence, and the opening cross-sectional area A1 is 450 mm and 700 mm in sequence, the corresponding flow area A2 of the two switching channels 22 is 700 mm and 1100 mm in sequence, and the corresponding flow area A3 of the two converging jetting channels 23 is 330 mm and 490 mm in sequence.

[0105] The distance of the atomization jetting port 24 located below the lower spiral digging blades 3 from the edge of the central rod of the drill bit is 110 mm, the opening cross-sectional area A1 is 250 mm, the flow area A2 of the switching channel 22 is 390 mm, the flow area A3 of the converging jetting channel 23 is 180 mm, and A1, A2, and A3 all satisfy the relationship: A1<A2+A3. The outlet of the mixing chamber area is narrowed, which is beneficial to further increase the outlet pressure, increase the slurry and gas flow rate, enhance the impact or scouring effect on the soil, and facilitate uniform mixing, while also preventing the external soil from flowing into the chamber.

[0106] The transverse length of the stationary blade 4 slightly exceeds the pile diameter by 25-30 mm and is arranged between the two layers of stirring blades 5 and between the stirring blades 5 and the digging blades. This is beneficial to form a relative shearing effect between the stirring blades 5 and the stationary blade 4, while also widening the spacing between the stirring blades 5, preventing the soil from adhering to the drill bit and following the rotation, and affecting the stirring effect.

[0107] The use method of the one-way large-diameter stirring and jetting drill bit adopting the multi-port uniform distribution atomization jetting structure is the same as that of Example 1, and will not be described again. It should be noted that the actions of the two groups of atomization jetting units 2 should be consistent.

[0108] As shown, the third performance form is as follows: Figure 4

[0109] ​The medium channel 10 includes one slurry medium channel 101 and two gas medium channels 102, the atomizing spray unit 2 is two groups, which are respectively arranged on the two sides of the drilling wing plate 3 of the center rod of the drill bit, the atomizing spray unit 2 includes two slurry flow channels 20, two gas flow channels 21, four switching channels 22, four converging spray channels 23 and four atomizing spray ports 24, the slurry medium channel 101 is a Y-shaped structure, the two slurry flow channels 20 are respectively connected to the two free ends of the Y-shaped structure, the two gas medium channels 102 are respectively communicated with the two gas flow channels 21, one end of the four switching channels 22 is communicated with the two slurry flow channels 20, and the other end is respectively communicated with the four converging spray channels 23, the four converging spray channels 23 are respectively communicated with the two gas flow channels 21 in a 2-1 corresponding mode, the four atomizing spray ports 24 are respectively arranged at the free ends of the four converging spray channels 23, and the two slurry flow channels 20 are respectively provided with a one-way valve 103 at the connection positions of the two slurry flow channels 20 and the two slurry medium channels 101.

[0110] Example 3

[0111] As Figures 9-10 shown, a bidirectional mutual shearing and jetting drill bit adopting a multi-port uniform atomizing spray structure performance form three of the application includes a stirring wing plate and a drill rod joint 6, the drilling wing plates 3 included in the two groups of atomizing spray units 2 are straight plates and are respectively located on the two sides of the center rod of the drill bit, the stirring wing plate is divided into a transverse stirring wing plate and a vertical stirring wing plate, and under the driving of the inner and outer drill rods, the stirring wing plates form a crosswise mutual shearing effect. The atomizing sprayers included in the two groups of atomizing spray units 2 are respectively located on the side close to the center rod of the drill bit and the side far away from the center rod of the drill bit. The center rod has a diameter of 180 mm, the length of the stirring wing plate is 660 mm, and the diameter of the jetting pile constructed by using the drill bit is 1500 mm.

[0112] Along the extension direction of the upper straight plate type drilling wing plate 3, the distances of the two atomizing spray ports 24 far away from the center rod of the drill bit from the edge of the center rod of the drill bit are 410 mm and 580 mm in sequence, the opening cross-sectional areas A1 are 420 , 630 in sequence, the flow areas A2 of the corresponding two switching channels 22 are 590 , 900 in sequence, and the flow areas A3 of the corresponding two converging spray channels 23 are 300 , 450 in sequence. The distances of the two atomizing spray ports 24 far away from the center rod of the drill bit from the edge of the center rod of the drill bit are 80 mm and 250 mm in sequence, the opening cross-sectional areas A1 are 100 , 250 in sequence, the flow areas A2 of the switching channels 22 are 150 , 360 The flow area A3 of the confluence jetting channel 23 is 70 , 180 The three areas A1, A2 and A3 satisfy the relationship A1<A2+A3. The outlet of the mixing cavity is narrowed, 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, and facilitate uniform mixing. Meanwhile, the external soil is prevented from flowing into the cavity.

[0113] The transverse length of the static blade 4 is slightly larger than the pile diameter by 25-30 mm, and is arranged between the two layers of stirring blades 5 and between the stirring blades 5 and the digging blade layer. This is beneficial to form a relative shearing effect between the stirring blades 5 and the static blade 4, and to increase the spacing between the stirring blades 5, thereby preventing the soil from adhering to the drill bit and following the rotation, and affecting the stirring effect.

[0114] The use method of the single-direction large-diameter stirring and jetting drill bit with the multi-port uniform atomization jetting structure is the same as that of the embodiment 1, and will not be described again. It should be noted that the actions of the two groups of atomization jetting units 2 should be consistent.

[0115] As shown in FIG. 4, the performance form four is: Figure 5

[0116] The medium channel 10 includes one slurry medium channel 101 and one gas medium channel 102. The atomization jetting unit 2 includes one slurry flow channel 20, one gas flow channel 21, three switching channels 22, three confluence jetting channels 23 and three atomization jetting ports 24. The atomization jetting port 24 is a flat seam structure. The slurry medium channel 101 is in communication with the slurry flow channel 20. The gas medium channel 102 is in communication with the gas flow channel 21. One end of the three switching channels 22 is in communication with the slurry flow channel 20, and the other end is in communication with the three confluence jetting channels 23, respectively. The three confluence jetting channels 23 are all in communication with the gas flow channel 21. The three atomization jetting ports 24 are respectively arranged at the free ends of the three confluence jetting channels 23. The slurry flow channel 20 and the gas flow channel 21 are both provided with a one-way valve 103.

[0117] Embodiment 4

[0118] As shown in FIG. 4, the performance form four is: Figure 11 ​As shown, a double-shaft stirring and jetting drill bit adopting the fourth performance form of the multi-nozzle uniform distribution atomizing and jetting structure of the present application comprises a stationary blade 4, stirring wing plates, a drill rod joint 6, and atomizing and jetting nozzles which are located below the excavation wing plates 3 on one side of the drill bit central rod. The stationary blade 4 is fixed on the two drill bit central rods in a double-shaft connection manner. The stirring wing plates on the two drill bit central rods have the same installation height, and the rotary coverage ranges overlap each other by a certain width of 200 mm. When initially installed, the two rotary wing plates need to be staggered by a certain angle to prevent rotary collision. The central rod has a diameter of 110 mm, and the stirring wing plates have a length of 370 mm. The stirring and jetting pile with a diameter of 850 mm is constructed by using the drill bit.

[0119] Along the extension direction of the excavation wing plates 3, the distances of the three atomizing and jetting nozzles 24 from the edge of the drill bit central rod are 60 mm, 190 mm, and 3100 mm, respectively. The openings are circular, and the cross-sectional areas A1 are 200 , 400 , and 600 , respectively. The corresponding flow areas A2 of the three switching channels 22 are 300 , 600 , and 900 , respectively. The corresponding flow areas A3 of the three converging jetting channels 23 are 150 , 300 , and 450 , respectively. The relationship among the three is A1<A2+A3. The outlet of the mixing chamber is narrowed, which is beneficial to further increase the outlet pressure, increase the slurry and gas flow rate, and enhance the impact or scouring effect on the soil, so that the mixture is easily and uniformly mixed, and the external soil is prevented from flowing into the chamber.

[0120] The stationary blade 4 is arranged between the two stirring blades 5 and between the stirring blades 5 and the excavation blades. This is beneficial to form a relative shearing effect between the stirring blades 5 and the stationary blade 4, and to separate the stirring blades 5, so as to prevent the soil from adhering to the drill bit and rotating with the drill bit, thereby affecting the stirring effect.

[0121] The use method of the double-shaft stirring and jetting drill bit with the multi-nozzle uniform distribution atomizing and jetting structure is the same as that of the embodiment 1, and will not be described here. It should be noted that the rotary speeds of the left and right drill bits need to be consistent.

[0122] As shown in the drawings, Figure 6 the fifth performance form is as follows:

[0123] The medium channel 10 comprises one slurry medium channel 101 and one gas medium channel 102, the atomizing injection unit 2 comprises one slurry flow channel 20, one gas flow channel 21, three switching channels 22, three converging injection channels 23, and three atomizing injection ports 24, the atomizing injection port 24 is in a circular structure, the slurry medium channel 101 is communicated with the slurry flow channel 20, the gas medium channel 102 is communicated with the gas flow channel 21, one end of the three switching channels 22 is communicated with the slurry flow channel 20, the other end of the three switching channels 22 respectively passes through the gas flow channel 21 and is communicated with each converging injection channel 23, the gas flow channel 21 is communicated with the three converging injection channels 23, the switching channel 22 and the converging injection channel 23 exist partial coaxial lap joint, the gas flows into the converging injection channel 23 from the annular channel formed by the two, and is sprayed out together with the slurry from the three atomizing injection ports 24 arranged at the other end, and the gas flow channel 21 is provided with a one-way valve 103.

[0124] Example 5

[0125] As Figure 12 shown, a three-shaft stirring and spraying drill bit adopting the multi-port uniform distribution atomizing injection structure performance form five of the present application comprises stirring wing plates and a drill rod joint 6, and the atomizing injectors are located below the cutting wing plates 3 on one side of the drill bit central rod. The installation heights of the stirring wing plates on the three drill bit central rods are staggered two by two, have a certain height difference, prevent rotation collision, the adjacent stirring wing plates have a certain overlapping area in the rotation coverage range, and the lap joint width is 200mm. The central rod diameter is 110mm, the length of the stirring wing plate is 370mm, and the stirring and spraying pile diameter adopting the drill bit for construction is 850mm.

[0126] The other features of the drill bit are basically the same as those of the drill bit in example 4, the use method is the same as that in example 1, and will not be described one by one.

[0127] Another technical solution adopted by the present application is a multi-port uniform distribution atomizing injection structure design method for designing the above-mentioned multi-port uniform distribution atomizing injection structure, comprising the following steps:

[0128] S1, determining the medium channel 10 configuration: according to the construction pile diameter and the stratum characteristics, the number and connection mode of the slurry medium channel 101 and the gas medium channel 102 are selected, the slurry medium channel 101 and the gas medium channel 102 are respectively used for conveying slurry and high-pressure gas;

[0129] S2, design atomizing injection unit 2 composition: based on the medium channel 10 configuration of step S1, determine the number and connection relationship of slurry flow channel 20, gas flow channel 21, adapter channel 22, confluence injection channel 23 and atomizing injection port 24 in atomizing injection unit 2, so that slurry flow channel 20 is communicated with slurry medium channel 101, gas flow channel 21 is communicated with gas medium channel 102, adapter channel 22 connects slurry flow channel 20 and confluence injection channel 23, and confluence injection channel 23 is provided with atomizing injection port 24 at the free end;

[0130] S3, calculate the flow area parameter: set the opening cross-sectional area of the atomizing injection port 24 as A1, the flow area of the adapter channel 22 as A2, and the flow area of the confluence injection channel 23 as A3, and ensure that A1 A1 is calculated according to the formula A1 = πr2 for a circular atomizing injection port 24, and A1 is calculated according to WxL for a flat slot-shaped atomizing injection port 24;

[0131] S4, arrange the atomizing injection port 24: along the length direction of the drilling wing plate 3, the opening cross-sectional area shared by the atomizing injection port 24 per unit length range shows an increasing trend, the opening cross-sectional area per unit length S = ΔA1 / Δx, and Δx satisfies x1

[0132] S5, select the performance form: according to the construction demand, select the matching structure form from a plurality of performance forms including a plurality of channel number combinations, atomizing injection port 24 shapes and arrangement modes, and set a one-way valve 103 at the connection between the slurry flow channel 20 and the slurry medium channel 101 or on the gas flow channel 21.

[0133] The design method guarantees uniform mixing of gas and liquid in the confluence channel by limiting the diameter ratio of each channel, and at the same time, reduces the local resistance coefficient of the fluid by the coaxial lap joint design of the adapter channel 22 and the confluence channel (such as the annular gas channel in form five), avoids pressure loss caused by improper connection angle of the channel, and ensures the technical compatibility of each unit component in the fluid conveying and mixing link through this modular collaborative design.

[0134] According to the relationship A1 A1 = πr2 for a circular nozzle, and A1 = WxL for a flat slot-shaped nozzle; ensure stable outlet flow rate, and ensure consistent spraying coverage width for a flat slot-shaped nozzle; at the same time, A1

[0135] The open cross-sectional area S per unit length is ΔA1 / Δx, which satisfies S(x1) < S(x2) corresponding to any positions x1 < x2 from the connecting point of the wing plate and the central drill rod 1 to the outer edge of the wing plate, to realize the radial matching of "slurry supply amount-soil reinforcement demand": the soil in the near-central area (x≤100mm) is strongly affected by the shear of the drill rod, and the S value is designed to be small to avoid slurry enrichment, and the soil in the edge area is under stress, and the S value is designed to be 2-4 times that of the central area, which can ensure sufficient slurry to improve the strength.

[0136] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are equivalent modifications and evolutions of the above embodiments according to the essential technology of the present application, and these all belong to the protection scope of the present application.

Claims

1. A porous uniformly distributed atomizing spray structure, comprising: The drill bit center rod and the cutting flange are characterized in that a medium channel is provided inside the drill bit center rod, and an atomizing spray unit is provided on the cutting flange, wherein the atomizing spray unit is connected to the medium channel; The medium channel includes a slurry medium channel and a gas medium channel, and the atomizing injection unit includes a slurry diversion channel, a gas diversion channel, a transfer channel, a confluence injection channel, and an atomizing injection port; One end of the slurry diversion channel is connected to the slurry medium channel, one end of the gas diversion channel is connected to the gas medium channel, one end of the transfer channel is connected to the free end of the slurry diversion channel or the free end of the gas medium channel, and the other end of the transfer channel is connected to the confluence injection channel; The atomizing nozzle is located at the free end of the confluence jet channel and below the excavating wing plate. The slurry is mixed with high-pressure gas through the confluence jet channel and dispersed into tiny droplets, which are then ejected from the atomizing nozzle below the excavating wing plate. The jetting structure has various forms.

2. The porous uniformly distributed atomizing spray structure according to claim 1, characterized in that: The cross-sectional area of ​​the atomizing nozzle is A1, the flow area of ​​the transition channel is A2, and the flow area of ​​the confluence jet channel is A3. The three satisfy the relationship: A1 < A2 + A3.

3. The porous uniformly distributed atomizing spray structure according to claim 1, characterized in that: The cross-sectional area of ​​the atomizing nozzle distributed per unit length along the length of the excavating wing plate shows an increasing trend.

4. The porous uniformly distributed atomizing spray structure according to claim 1, characterized in that: The various manifestations include manifestation one: The media channels include one slurry media channel and one gas media channel; The atomizing spray unit includes one slurry diversion channel, one gas diversion channel, three transfer channels, three confluence spray channels, and three atomizing spray nozzles, wherein the atomizing spray nozzles are circular. The slurry medium channel is connected to the slurry drainage channel, and the gas medium channel is connected to the gas drainage channel; One end of each of the three transfer channels is connected to the gas diversion channel, and the other end is connected to each of the three confluence jet channels. All three confluence jet channels are connected to the slurry diversion channel. The three atomizing jets are respectively located at the free ends of the three confluence jet channels. A one-way valve is provided at the connection between the gas diversion channel and the gas medium channel.

5. The porous uniformly distributed atomizing spray structure according to claim 1, characterized in that: The various manifestations include manifestation two: The medium channels include two slurry medium channels and two gas medium channels; The atomizing injection unit consists of two sets, namely an upper atomizing injection unit and a lower atomizing injection unit. The two slurry medium channels and gas medium channels are respectively connected to the upper atomizing injection unit and the lower atomizing injection unit. The upper atomizing injection unit and the lower atomizing injection unit are respectively installed on the upper cutting flange and the lower cutting flange of the drill bit center rod. The upper atomizing spray unit includes one slurry diversion channel, one gas diversion channel, two transfer channels, two confluence spray channels, and two atomizing spray ports; The slurry medium channel is connected to the slurry drainage channel, and the gas medium channel is connected to the gas drainage channel; One end of each of the two transfer channels is connected to the gas medium channel, and the other end is connected to each of the two confluence jet channels. Both of the two confluence jet channels are connected to the slurry diversion channel. The two atomizing jets are respectively located at the free ends of the two confluence jet channels. A one-way valve is provided at the connection between the gas diversion channel and the gas medium channel.

6. The porous uniformly distributed atomizing spray structure according to claim 5, characterized in that: The lower atomizing spray unit includes a slurry diversion channel, a gas diversion channel, a transfer channel, a confluence spray channel, and an atomizing spray port; The slurry medium channel is connected to the slurry drainage channel, and the gas medium channel is connected to the gas drainage channel; One of the transfer channels is connected at one end to the slurry diversion channel, and at the other end to one of the confluence jet channels. Each of the confluence jet channels is connected to the gas diversion channel. The atomizing jet nozzles are respectively located at the free ends of the confluence jet channels. A one-way valve is provided at the connection between the slurry diversion channel and the slurry medium channel.

7. The porous uniformly distributed atomizing spray structure according to claim 1, characterized in that: The various manifestations include manifestation three: The medium channels include one slurry medium channel and two gas medium channels; The atomizing injection unit consists of two sets, which are respectively installed on the cutting wing plates on both sides of the drill bit center rod. The atomizing injection unit includes two slurry diversion channels, two gas diversion channels, four transfer channels, four confluence injection channels, and four atomizing injection ports. The slurry medium channel has a Y-shaped structure, and the two slurry drainage channels are respectively connected to the two free ends of the Y-shaped structure. The two gas medium channels are respectively connected to the two gas drainage channels. One end of each of the four transfer channels is connected to one of the two slurry diversion channels, and the other end is connected to one of the four confluence jet channels respectively. The four confluence jet channels are connected to the two gas diversion channels in a 2-1 correspondence. The four atomizing jet nozzles are respectively located at the free ends of the four confluence jet channels. One-way valves are installed at the connection points between the two slurry drainage channels and the two slurry medium channels.

8. The porous uniformly distributed atomizing spray structure according to claim 1, characterized in that: The various manifestations include manifestation four: The media channels include one slurry media channel and one gas media channel; The atomizing spray unit includes one slurry diversion channel, one gas diversion channel, three transfer channels, three confluence spray channels, and three atomizing spray nozzles, wherein the atomizing spray nozzles have a flat slit structure. The slurry medium channel is connected to the slurry drainage channel, and the gas medium channel is connected to the gas drainage channel; One end of each of the three transfer channels is connected to the slurry diversion channel, and the other end is connected to each of the three confluence jet channels. All three confluence jet channels are connected to the gas diversion channel. The three atomizing jet nozzles are respectively located at the free ends of the three confluence jet channels. Both the slurry drainage channel and the gas drainage channel are equipped with one-way valves.

9. The porous uniformly distributed atomizing spray structure according to claim 1, characterized in that: The various manifestations include manifestation five: The media channels include one slurry media channel and one gas media channel; The atomizing spray unit includes one slurry diversion channel, one gas diversion channel, three transfer channels, three confluence spray channels, and three atomizing spray nozzles, wherein the atomizing spray nozzles are circular. The slurry medium channel is connected to the slurry drainage channel, and the gas medium channel is connected to the gas drainage channel; One end of each of the three transfer channels is connected to the slurry diversion channel, and the other end passes through the gas diversion channel and is connected to each of the confluence injection channels. The gas diversion channels are all connected to the three confluence injection channels. The transfer channels and the confluence injection channels are partially coaxially overlapped. Gas flows into the confluence injection channel from the annular channel formed by the two and is ejected from the three atomizing injection ports at the other end along with the slurry. A one-way valve is installed on the gas drainage channel.

10. A design method for a porous uniformly distributed atomizing spray structure, characterized in that: The method for designing the porous uniform atomizing spray structure according to any one of claims 1-9 includes the following steps: S1. Determine the configuration of the medium channels: Based on the construction pile diameter and the characteristics of the stratum, select the number and connection method of the grout medium channels and the gas medium channels. The grout medium channels and the gas medium channels are used to transport grout and high-pressure gas, respectively. S2. Design the composition of the atomizing spray unit: Based on the medium channel configuration in step S1, determine the number and connection relationship of the slurry diversion channel, gas diversion channel, transfer channel, confluence spray channel and atomizing spray port in the atomizing spray unit, so that the slurry diversion channel is connected to the slurry medium channel, the gas diversion channel is connected to the gas medium channel, the transfer channel connects the slurry diversion channel and the confluence spray channel, and the atomizing spray port is set at the free end of the confluence spray channel; S3. Calculate the flow area parameters: Set the cross-sectional area of ​​the atomizing nozzle opening as A1, the flow area of ​​the transition channel as A2, and the flow area of ​​the confluence jet channel as A3, ensuring that all three satisfy A1 < A2 + A3. Wherein, A1 of the circular atomizing nozzle is calculated as follows: The calculation of A1 for the flat slit atomizing nozzle is based on W×L; S4. Arrange atomizing nozzles: Along the length of the excavating wing plate, make the opening cross-sectional area distributed per unit length of the atomizing nozzles increase. The opening cross-sectional area distributed per unit length is S=ΔA1 / Δx, where Δx satisfies that from the connection point between the wing plate and the central drill pipe to the outer edge of the wing plate, any position x1<x2 corresponds to S(x1)<S(x2). S5. Select the form of expression: Based on the construction requirements, select the matching structural form from a variety of forms of expression that include multiple combinations of channel numbers, atomizing nozzle shapes and arrangements, and install one-way valves at the connection between the slurry drainage channel and the slurry medium channel or on the gas drainage channel.

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