Vertical spiral feeding and spraying device

Abstract

The utility model provides a vertical spiral feeding jet device, including tank, spiral feeding mechanism, jet machine system and controller, spiral feeding mechanism is vertically connected in tank, jet machine system includes receiving chamber, pipeline mixer, intake subassembly and gas material delivery pipeline, the discharge port of tank bottom is communicated with the inlet of receiving chamber, and the discharge port of tank bottom is communicated with the inlet of receiving chamber. An outlet of the receiving chamber is communicated to the pipeline mixer, the gas inlet assembly comprises a high-pressure gas supply pipe and a tank body pressurizing pipe, and the gas outlet end of the high-pressure gas supply pipe is communicated to the receiving chamber; after being mixed and compressed by the pipeline mixer, the mixture is pneumatically conveyed into the main feeding channel of the stirring drilling tool through the gas conveying pipeline, and the tank body pressurizing pipe is used for pressurizing in the tank. The vertical spiral feeding jetting device serves as a construction feeding background, accurate and stable feeding is achieved through the intelligent controller, and the foundation treatment construction quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering foundation treatment construction machinery and equipment, in particular to a vertical spiral feeding and injection device for dry mixing pile construction used for soft soil foundation reinforcement treatment. Background Art

[0002] Soft soil foundations are widely distributed in my country, especially in the sea, lake and river areas, where the foundation soil has a high moisture content, a large void ratio and high compressibility. For this type of soft soil foundation, land development requires a large amount of soft soil foundation engineering treatment. In the past 70 years, the traditional slurry-jetted mixing pile technology has been often used in the civil engineering industry to reinforce and treat this type of soft foundation. However, the strength and bearing capacity of the reinforced foundation obtained by using the slurry-jetted mixing pile construction technology and method to reinforce and treat this type of soft soil foundation often cannot meet the design purpose.

[0003] To this end, Nordic countries have developed dry mixing pile technology, which uses dry powder of curing agent such as lime or cement to reinforce saturated soft soil foundation. This technology and method are particularly suitable for foundation soil with high moisture content, large void ratio and high compressibility. The application of dry mixing pile technology in civil engineering can achieve good soft foundation reinforcement treatment effect. However, the existing dry mixing pile construction background mainly uses manually controlled feed tanks, general sprayers and material delivery pipeline equipment. During the construction process, powder feeding and spraying machine device operation are all done manually, which is completely based on the experience of workers. Due to the differences in the skill level and proficiency of construction personnel, powder feeding and spraying transportation often lead to uneven and unstable states, which is particularly prone to blockage of the transportation pipeline of curing materials, resulting in discontinuous feeding, spraying and transportation of curing agent powder in dry mixing pile construction, uneven curing agent spraying amount of construction drill, and difficult to guarantee the construction quality of the mixing pile body; and it will also cause waste of construction raw materials, labor and construction period.

[0004] The prior art has the following specific technical defects:

[0005] (1) The continuous feeding method of the ash tank used in dry mixing pile construction generally adopts the pneumatic or turntable method. The feeding speed and feeding amount are manually controlled by the construction personnel, and it is impossible to accurately control the feeding amount according to the design requirements. The amount of curing agent sprayed per unit pile length fluctuates greatly, and is even intermittent, sometimes more and sometimes less. The continuity of the pile body strength is poor and is far lower than the designed pile body strength. In particular, the phenomenon of no curing agent or less curing agent often occurs in the deep pile section.

[0006] (2) The structural design of the powder injection system is unreasonable. The powder fluidization pipeline and the conveying pipeline in front of the nozzle of the injection system are designed with equal diameters, which cannot generate a good gas-solid two-phase mixed vortex, reducing the pneumatic conveying capacity of the curing agent powder and making it difficult to meet the continuous and stable feeding requirements of the mixing pile construction drill. This will cause discontinuity in the pile body material and strength of the dry mixing pile, resulting in failure of drilling and core extraction of the dry mixing pile and unqualified quality inspection results.

[0007] (3) Due to the inability to accurately control the curing agent supply amount of the ash tank according to the design requirements, the structural design defects of the powder spraying machine system and the lack of intelligent control devices in the background of the dry mixing pile, the application of domestic dry mixing pile technology and methods is limited to within the range of 500mm diameter and 15m depth, which seriously limits the engineering application scope of dry spraying technology. In addition, due to the frequent engineering accidents of failing the engineering quality inspection, the use of dry mixing piles is restricted in many provinces, municipalities and autonomous regions.

[0008] The above-mentioned defects of the prior art will also lead to increased construction costs, including material costs, labor costs, time costs and engineering design change costs, resulting in a decline in the market competitiveness of dry mixing pile technology. Utility Model Content

[0009] The problem solved by the utility model is to provide a vertical spiral feeding and injection device to overcome at least one defect in the prior art, which provides a reliable and stable construction background equipment for dry mixing pile construction on soft soil foundation, and realizes automatic control of parameters such as feeding speed and feeding amount during the construction process.

[0010] In order to solve the above problems, the utility model provides a vertical spiral feeding injection device, comprising a tank body, a spiral feeding mechanism, an injection machine system and a controller, wherein the spiral feeding mechanism is vertically connected to the tank body and is located on the central axis thereof, and the injection machine system comprises a receiving chamber, a pipeline mixer, an air intake assembly and an air material conveying pipeline, wherein the discharge port at the bottom of the tank body is connected to the inlet of the receiving chamber, and the outlet of the receiving chamber is connected to the pipeline mixer; one end of the air intake assembly is connected to an external air source, and the other end is connected to the receiving chamber through an injector, and the curing agent powder conveyed in the tank body is mixed and compressed by the pipeline mixer under the action of high-pressure gas injection, and then pneumatically conveyed to the main feed channel of the stirring drill tool through the air material conveying pipeline;

[0011] The air intake assembly includes a high-pressure air supply pipe and a tank body boost pipe, the air outlet end of the high-pressure air supply pipe is connected to the receiving chamber, one end of the tank body boost pipe is connected to the high-pressure air supply pipe, and the other end is connected to the top of the tank body, and a switch valve four is connected to the tank body boost pipe; a switch valve one for opening and closing the feed port is provided on the top of the tank body, a pressure gauge one and a switch valve two for opening and closing the exhaust port are connected to the tank body, and a switch valve three is provided at the connection between the lower end of the tank body and the inlet of the receiving chamber; a regulating valve, a safety valve two, a pressure gauge two and a gas flow meter for controlling the intake air flow rate are connected to the high-pressure air supply pipe, and a gas source switch is connected to the high-pressure air supply pipe, and the switch valve four, switch valve one, pressure gauge one, switch valve two, switch valve three, regulating valve, pressure gauge two, gas flow meter and gas source switch are all connected to the electrical signal of the controller.

[0012] Compared with the prior art, the vertical spiral feeding injection device of the utility model has the following advantages:

[0013] The discharge detection mechanism of the utility model structure is a special mechanism, which uses a controller to eliminate various technical drawbacks in the existing dry mixing pile construction background equipment and its use, covers the problem of uniform quantitative discharge controllability of the tank and the spiral conveying device to be solved, and proposes a new structure of the injection machine system for gas-solid two-phase flow injection and a pipeline system that can ensure the stable transportation of the gas-solid two-phase vortex; ultimately, it realizes the supply of stable and continuous gas-solid two-phase fluid mixed curing agent powder to the dry mixing pile construction drilling rig, ensuring that the dry mixing pile meets the design requirements in terms of overall pile body strength and single pile bearing capacity. In addition, it also It can make substantial contributions to reducing material costs, labor costs and time costs. Specifically, through the automatic program control of the motor components, various switch valves, various pipeline pressure gauges and gas flow meters by the controller, including effective real-time monitoring and automatic control of various physical quantities, the background equipment can be automated and efficiently operated and quantitative feeding can be achieved. At the same time, the designed pile diameter and pile length of the mixing pile construction are increased, and the construction quality of the dry mixing pile can be guaranteed, thereby greatly reducing the material cost, labor cost and time cost, improving the market competitiveness of the dry mixing pile technology and expanding the engineering application scope of the dry mixing pile.

[0014] As an improvement, a tank support is provided at the lower end of the tank body, a weighing sensor is connected to the upper end of the tank support, the outer wall of the tank body is supported on the weighing sensor, and the weighing sensor is connected to the controller via an electrical signal.

[0015] Further improved, the spiral feeding mechanism includes a screw and a motor assembly, the screw is vertically rotatably connected in the tank body, the motor assembly is connected to the top or bottom of the tank body and is used to drive the screw to rotate; continuous spiral blades are arranged on the outer wall of the lower end of the screw, and a plurality of spirally distributed stirring blades are arranged on the outer wall of the upper end of the screw; the motor assembly is electrically signal connected to the controller.

[0016] Further improved, the stirring blades include fixed blades, a rotating shaft and an expansion blade, and the fixed blades and the expansion blades are rotatably connected via the rotating shaft. When the screw rotates forward, the expansion blades rotate outward and expand, and when the expansion blades are fully expanded, the total length of the stirring blades is less than the diameter of the tank body; when the screw rotates reversely, the expansion blades rotate inward and retract.

[0017] Further improved, when the motor assembly is connected to the bottom of the tank body, the motor assembly is connected to the tank body bracket at the bottom of the tank body or is directly fixed to the ground through a fixed seat support, the upper end of the screw rod is rotatably connected to the top wall of the tank body, and the lower end of the screw rod passes through the receiving chamber and is connected to the power output shaft of the motor assembly.

[0018] As a further improvement, the bottom of the tank body is connected with a feed pipe communicating with its inner cavity, and the lower end of the feed pipe is connected with the inlet of the receiving chamber; the gap between the radial outer edge of the spiral blade and the inner wall of the feed pipe is less than 1 mm.

[0019] Further improved, the injector includes an injection pipe and a working nozzle, and the cross-sectional midlines of the injection pipe, the working nozzle and the pipeline mixer are on the same axis; the pipeline mixer includes a contraction tube, a mixing tube and a diffusion tube connected in sequence, and the outlet of the receiving chamber is connected with the inlet of the contraction tube; the contraction tube and the diffusion tube are both tapered tubes, the mixing tube is a cylindrical tube, the large diameter end of the contraction tube is connected with the outlet of the receiving chamber, the small diameter end of the contraction tube is connected with one end of the mixing tube, the other end of the contraction tube is connected with the small diameter end of the diffusion tube, and the large diameter end of the diffusion tube is connected with the inlet of the gas material conveying pipeline.

[0020] As a further improvement, the outlet end of the working nozzle is located in the receiving chamber at the right side of the perpendicular midline of the receiving chamber, and the diameter of the inner hole of the jet port of the working nozzle is a structure that first decreases and then increases.

[0021] As a further improvement, the lower end of the tank body is a conical structure with a larger upper portion and a smaller lower portion; a plurality of vibrators are connected to the conical inclined surface of the lower portion of the tank body.

[0022] Beneficial technical effects brought by the utility model:

[0023] 1. The vertical spiral feeding and injection device of the utility model adopts an upper or lower motor assembly driving mode, which is more flexible in structure and can select a suitable driving structure installation mode according to different construction site conditions.

[0024] 2. The spiral feeding mechanism uses the regular design of the spiral blades and the intelligent controller to effectively control the rotation speed and quantitative feeding of the spiral feeding mechanism, thereby ensuring that the curing agent powder can be constantly and stably delivered to the receiving room of the injection machine system. In addition, the expansion blades on the rotating shaft can be expanded and lengthened when the screw rotates forward, and can be retracted and shortened when the screw rotates reversely. This structural design can not only ensure the smooth installation of the expansion blades, but also push the curing agent powder in the tank body to move downward, which is conducive to the smooth output of the curing agent powder.

[0025] 3. Through structural optimization design, the gap between the inner wall of the feed pipe and the outer edge of the spiral blade is less than 1mm, which not only ensures that the curing agent powder in the gap zone does not leak down, but also forms two relatively isolated space structures between the sprayer system and the tank body, so that the curing agent powder can be smoothly and stably input into the receiving room through the bottom of the feed pipe.

[0026] 4. In the jet machine system, through the improvement of the pipeline mixer, including the shrinking tube, mixing tube and diffuser connected at one time, that is, the diameter of the pipeline mixer is a structure of reducing diameter-equal diameter-expanding diameter, the gas-solid two-phase flow can be fully mixed, compressed and pressurized, and then the curing agent powder is quantitatively and stably transported to the drilling tool of the drilling rig through the air material conveying pipeline by pneumatic conveying, thereby effectively ensuring the high-quality construction of powder injection piles.

[0027] 5. The controller can monitor and automatically control the opening and closing of various pressure gauges, flow meters, weighing sensors, vibrators and various valves and switches in the equipment in real time during construction, thereby safely and effectively controlling the entire construction process and ensuring high-efficiency and high-quality powder injection pile construction.

[0028] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the vertical spiral feeding and injection device of the first embodiment of the utility model;

[0030] Figure 2 It is a schematic diagram of the structure of the rotary stirring blade in the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the jet system in the first embodiment of the utility model;

[0032] Figure 4 This is a schematic diagram of the structure of the working nozzle in the first embodiment of the utility model;

[0033] Figure 5 This is a schematic diagram of the process structure of the vertical spiral feeding and injection device in the first embodiment of the utility model;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the vertical spiral feeding and injection device of the second embodiment of the utility model;

[0035] Figure 7 It is a structural diagram of the jet system in the second embodiment of the utility model;

[0036] Figure 8 This is a schematic diagram of the process structure of the vertical spiral feeding and injection device in the second embodiment of the utility model;

[0037] Fig. 9 This is a schematic diagram of the three-dimensional structure of the vertical spiral feeding and injection device of the third embodiment of the utility model;

[0038] Fig.10 It is a structural diagram of the jet system in the third embodiment of the present utility model;

[0039] Fig.11 It is a schematic diagram of the three-dimensional structure of the vertical spiral feeding and injection device of the fourth embodiment of the utility model;

[0040] Fig.12 This is a schematic diagram of the structure of the jet system in the fourth embodiment of the utility model;

[0041] Fig.13 It is a schematic diagram of the structure of the jet system in the fourth embodiment of the present utility model.

[0042] Description of reference numerals:

[0043] 1. Driving motor; 2. Speed ​​reducer; 3. Pressure gauge 1; 4. Safety valve 1; 5. Tank booster pipe; 6. Tank; 7. Tank support; 8. High-pressure gas supply pipe; 9. Gas source switch; 10. Safety valve 2; 11. Regulating valve; 12. Gas flow meter; 13. Pressure gauge 2; 14. Injector system; 15. Gas material conveying pipeline; 16. Feed inlet; 17. Switch valve 1; 18. Switch valve 2; 19. Exhaust port; 20. Screw feeding mechanism; 21. Weighing sensor; 22. Vibrator; 23. Switch valve 3; 24. Top Support bearing; 25, feed pipe; 26, injection pipe; 261, injection pipe branch; 27, screw; 28, rotary stirring blade; 29, spiral blade; 30, pipeline mixer; 301, contraction tube; 302, mixing tube; 303, diffusion tube; 31, air source casing; 32, working nozzle; 321, jet port; 33, receiving chamber; 40, controller; 41, switch valve four; 42, first air compressor; 43, air storage tank; 44, dryer; 45, second air compressor; 46, high-pressure delivery hose; 47, drilling tools. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] In the description of the present invention, it should be noted that the terms "upper end", "lower end", "inside and outside", "top", "bottom", "outer wall" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Embodiment 1:

[0048] Application conditions: The engineering background of this embodiment is a composite foundation project of powder injection piles in a container yard at a coastal terminal. The designed length of the powder injection pile is 25m, the pile diameter is 600mm, and the design strength of the mixing pile for 7d is 1.1MPa. The basic geological conditions of this site: There are two layers of foundation soil under the site, namely ① silt soil layer, layer thickness 20m, water content w=72%, e=1.60, SPT=2~4, ② silt clay layer, layer thickness 12m, water content w=56%, e=1.05, SPT=5~18. The curing agent adopts KD curing agent powder product, and the particle size of the curing agent is required to be no more than 60μm, and the curing agent admixture amount is 20%. The construction adopts a multi-layer shear mixing pile drilling rig equipment to carry out the powder curing agent spray mixing pile forming process, and specifically adopts a two-mixing and one-spraying construction process. The construction requires that the injection pressure of the gas-solid two-phase flow at the material inlet of the drilling tool 47 shall not be less than 0.45MPa, and the pressure of the initial compressed air provided by the air source shall be 0.75MPa, and the air pressure in the tank 6 shall not be less than 0.35MPa.

[0049] like Figures 1 to 5 As shown, the background of the powder injection pile construction adopted in this embodiment is: a vertical spiral feeding injection device, which mainly includes: a tank body 6, a tank body bracket 7, a screw feeding mechanism, an injection machine system 14 and a controller 40. The tank body 6 is mounted on the upper part of the tank body bracket 7, the top cover of the tank body 6 is a curved surface, and the cone angle of the tank body 6 at the lower part of the tank body 6 is 85°. The tank body 6 is a pressure vessel, which can withstand a maximum pressure of 8Bar. In addition, the injection machine system 14 includes a receiving chamber 33, a pipeline mixer 30, an air intake assembly and an air material conveying pipeline 15. The discharge port at the bottom of the tank body 6 is connected to the inlet of the receiving chamber 33, and the outlet of the receiving chamber 33 is connected to the pipeline mixer 30; one end of the air intake assembly is connected to the external air source, and the other end is connected to the receiving chamber 33 through the injector, which is used to mix the curing agent powder conveyed from the tank body 6 through the pipeline mixer 30 and then spray it through the air material conveying pipeline 15 to the feed channel of the drilling tool 47 of the drilling rig.

[0050] like Figure 1As shown, the tank support 7 is provided with three supporting points for supporting the tank body 6, and each supporting point is provided with a weighing sensor 21 for real-time weight monitoring of the curing agent powder in the tank to ensure uniform quantitative feeding. The screw feeding mechanism in this embodiment is vertically arranged on the inner center axis of the tank body 6, and the screw feeding mechanism 20 includes a screw 27 and a motor assembly. The motor assembly serving as a drive is arranged at the top center position of the tank and is connected by a bearing seal; the motor assembly includes a drive motor 1 and a reducer 2, wherein the drive motor 1 is controlled by a servo motor through a controller 40; the screw 27 is vertically rotatably connected in the tank body 6, and the motor assembly is connected to the top of the tank body 6 and is used to drive the screw 27 to rotate; a continuous spiral blade 29 is provided on the outer wall of the lower end of the screw 27, and a plurality of spirally distributed stirring blades 28 are provided on the outer wall of the upper end of the screw 27; specifically, as Figure 2 As shown, the stirring blade 28 includes a fixed blade 281, a rotating shaft 282 and an expansion blade 283. The fixed blade 281 and the expansion blade 283 are rotatably connected via the rotating shaft 282. When the screw 27 rotates forward, the expansion blade 28 rotates outward and expands. When the expansion blade 283 is fully expanded, the expansion blade 28 and the fixed blade 281 are basically in the same straight line. At this time, the total length of the stirring blade 28 is less than the diameter of the tank body 6; when the screw 27 is reversed, the expansion blade 283 rotates inward in the opposite direction and retracts to the storage state, and in the storage state, the total length of the stirring blade 28 device is less than the diameter of the opening of the tank body 6, which is convenient for its installation.

[0051] In this embodiment, the inclination angle of the spiral blade 29 is 25°, and the diameter of the spiral blade 29 is 30 cm.

[0052] A feed pipe 25 communicating with the inner cavity of the tank body 6 is connected to the bottom thereof, and the lower end of the feed pipe 25 is connected to the inlet of the receiving chamber 33; the gap between the radial outer edge of the spiral blade 29 and the inner wall of the feed pipe 25 is less than 1 mm.

[0053] In addition, in this embodiment, the sprayer includes a spray pipe 26 and a working nozzle 32, and the cross-sectional midlines of the spray pipe 26, the working nozzle 32 and the pipeline mixer 30 are on the same axis; the pipeline mixer 30 includes a contraction tube 301, a mixing tube 302 and a diffusion tube 303 connected in sequence, and the outlet of the receiving chamber 33 is connected to the inlet of the contraction tube 301; the contraction tube 301 and the diffusion tube 303 are both conical tubes, the mixing tube 302 is a cylindrical tube, the large diameter end of the contraction tube 301 is connected to the outlet of the receiving chamber 33, the small diameter end of the contraction tube 301 is connected to one end of the mixing tube 302, the other end of the contraction tube 301 is connected to the small diameter end of the diffusion tube 303, and the large diameter end of the diffusion is connected to the inlet of the gas-material conveying pipeline 15. Specifically, the pipeline mixer 30 adopts a reduced diameter-equal diameter-expanded diameter structure, which is conducive to the formation of gas-solid two-phase swirl and supercharging, so as to achieve the functions of gas supply, measurement and control, material discharge, injection, gas-solid two-phase flow mixing compression fluidization and supercharging with good sealing.

[0054] More specifically, in this embodiment, the receiving chamber 33 is a bull horn shape, the outlet end of the working nozzle 32 is located in the receiving chamber 33 on the right side of the mid-vertical line of the receiving chamber 33, and the front end position of the working nozzle 32 can be adjusted by changing the length of the injection pipe 26; specifically, a horizontally extending gas source sleeve 31 is provided on the side wall of the receiving chamber 33, and the central axis of the gas source sleeve 31 is on the same straight line as the central axial line of the pipeline mixer 30. When installing, the injection pipe 26 is directly inserted and matched in the gas source sleeve 31, such as Figure 3 shown.

[0055] As another important parameter, Figure 4 As shown, the diameter of the jet port 321 of the working nozzle 32 in this embodiment is a structure that first shrinks and then expands. Usually, the inner diameter of the nozzle end of the working nozzle 32 is selected to be 10mm-20mm, and the enlarged cone angle of the inner diameter of the nozzle is preferably selected to be 1°-10°; when the length and structure of the working nozzle 32 are determined, it is required that at the vertical cross section of the circular through hole at the inlet end of the shrink tube 301, the diameter of the high-speed high-pressure gas jet beam ejected by the working nozzle 32 must be smaller than the diameter of the circular through hole, so that the high-pressure gas jet beam can be fully injected into the shrink tube 301 without generating a reflection effect; at the same time, a low-pressure area is formed in the receiving chamber 33, and the curing agent powder in the receiving chamber 33 is gradually sucked into the mixer through the induced jet flow around the high-pressure gas jet beam.

[0056] In the above structure, the flow rate and pressure of the high-pressure gas jet beam of the working nozzle 32 injected into the contraction tube 301 are much higher than the flow rate and pressure of the curing agent powder flow around it, and a non-uniform flow field is formed in the contraction tube 301 area. As the inner diameter of the contraction tube 301 gradually decreases and the friction of the mixed tube wall continues to increase, the high-pressure gas and the curing agent powder are gradually mixed, compressed and fluidized, and the flow rate of the gas-solid two-phase mixed fluid on each cross section of the central axis of the equal inner diameter mixing tube 302 gradually tends to be evenly distributed, and the flow rate on the outlet cross section of the mixing tube 302 is close to uniform distribution. The high-pressure gas and the curing agent powder are mixed and compressed and fluidized in the mixing tube 302 to form a vortex and enter the diffuser 303. When the gas-solid two-phase fluid with uniform flow rate flows through the diffuser 303, the flow rate will be increased and the dynamic pressure will increase. Then the gas-solid two-phase fluid enters the right end gas material conveying pipeline 15, and then continues to be conveyed to the feed channel of the drilling tool 47 by pneumatic conveying.

[0057] In this embodiment, the air intake assembly includes a high-pressure air supply pipe 8 and a tank body boosting pipe 5, wherein the air outlet end of the high-pressure air supply pipe 8 is connected to the receiving chamber 33, one end of the tank body boosting pipe 5 is connected to the high-pressure air supply pipe 8 through a three-way pipe, and the other end is connected to the top of the tank body 6, which is used to pressurize the tank body 6. When the feed injection device of this embodiment is actually used, an air compressor and an air storage tank 43 are connected to the front end of the air intake assembly, and the high-pressure gas generated by air compression first passes through the air storage tank 43, and then provides high-pressure gas to the working nozzle 32 through the high-pressure air supply pipe 8. The gas material conveying pipeline 15 uses pneumatic conveying to transport the mixed, compressed and pressurized gas-solid two-phase flow medium to the feed channel of the drilling tool 47; in addition, the high-pressure gas provided to the tank body 6 by the tank body boosting pipe 5, which is partially diverted from the high-pressure air supply pipe 8, ensures that the curing agent powder in the tank body 6 can be discharged smoothly.

[0058] More specifically, one end of the tank body boosting pipe 5 is connected to the high-pressure air supply pipe 8, and the other end is connected to the top of the tank body 6; a feed port 16 and a switch valve 17 for opening and closing the feed port 16 are provided on the top of the tank body 6, and a switch valve 41 is connected to the tank body boosting pipe 5 to control the connection and closure of the air path; in addition, a pressure gauge 3 and an exhaust port 19 are also provided on the top of the tank body 6, and the exhaust port 19 is opened, closed and sealed by a switch valve 18, and the exhaust port 19 can be used to discharge the air in the tank body 6 to maintain the balance of the pressure of the tank body 6 and the outside. A switch valve 3 23 is provided at the lower end of the tank body 6 and the position connected to the inlet of the spiral feeding mechanism 20; the high-pressure gas supply pipe 8 is connected with a regulating valve 11 for controlling the inlet gas flow rate, a safety valve 2 10, a pressure gauge 2 13 and a gas flow meter 12, and the high-pressure gas supply pipe 8 is connected with a gas source switch 9, and the switch valve 4 41, the switch valve 1 17, the pressure gauge 1 3, the switch valve 2 18, the switch valve 3 23, the regulating valve 11, the pressure gauge 2 13, the gas flow meter 12 and the gas source switch 9 are all connected to the controller 40 by electrical signals. The controller 40 monitors the pressure in the tank body 6 through the pressure gauge 1 3 and the switch valve 2 18 and maintains it at the designed pressure value.

[0059] Specifically, a pressure gauge 3 is provided on the upper part of the tank body 6 to monitor the pressure inside the tank. The tank body pressurization pipe 5 is connected to the inside of the tank body 6 and can pressurize the gas inside the tank. The safe air pressure value set in the tank body 6 is P1. When the air pressure inside the tank is greater than P1, the safety valve 4 will automatically open to release the pressure and reduce the pressure inside the tank. In this embodiment, three vibrators 22 are provided on the conical slope at the lower part of the tank body 6, which are responsible for vibrating the curing agent powder in the tank during the unloading process, so that the powder moves continuously to the bottom of the tank body 6.

[0060] like Figure 5 As shown, in actual application of the feed injection device of this embodiment, a first air compressor 42, an air storage tank 43 and a dryer 44 are connected to the front end of the air intake assembly. The high-pressure gas generated by the first air compression first passes through the air storage tank 43, and then provides 0.6MPa of high-pressure gas to the working nozzle 32 via the high-pressure air supply pipe 8. The gas material conveying pipeline 15 uses pneumatic conveying to transport the mixed compressed and pressurized gas-solid two-phase flow medium to the feed channel of the drilling tool 47; in addition, the tank body boosting pipe 5, which is partially diverted from the high-pressure air supply pipe 8, provides 0.3MPa of high-pressure gas to the tank body 6 to ensure that the curing agent powder in the tank body 6 can be discharged smoothly.

[0061] During the construction process, the controller 40 is responsible for the monitoring, control and operation of the feed injection device, that is, the PLC control program of the controller 40 is used to control the pressure in the tank 6, the designed rotation speed of the screw conveying mechanism and the designed amount of curing agent powder discharged, and the injection pressure and flow rate of the working nozzle 32; thereby ensuring the continuous and stable delivery of curing agent powder to the feed channel of the drilling tool 47 through the gas conveying pipeline 15; at the same time, the controller 40 is responsible for the measurement and opening and closing control of the gas flow meter 12, the gas source switch 9 and each switch valve. The application of the intelligent controller 40 covers the measurement, control and operation of each mechanism of the overall equipment.

[0062] In this embodiment, the steps of using the vertical spiral feeding injection device are as follows:

[0063] 1. Before the construction begins, open the switch valve 17 and the switch valve 2 18, keep the exhaust port 19 in an open state, inject curing agent powder into the tank body 6 through the feed port 16, and close the switch valve 17 and the switch valve 2 18 after the curing agent powder injection is completed;

[0064] 2. According to the requirements of the powder spraying construction process, the air source switch 9 is turned on through the background controller 40, and the compressed air generated by the air compressor enters the spray machine system 14 through the high-pressure air supply pipe 8. The gas flow meter 12 and the pressure gauge 13 are responsible for monitoring the gas delivery flow and pressure, and can be adjusted by the regulating valve 11. At the same time, after the high-pressure gas enters the tank body 6 through the tank body booster pipe 5, the curing agent powder in the tank body 6 is pressurized, and the pressure gauge 13 monitors the internal pressure of the tank body 6 to ensure that the curing agent powder is smoothly transported downward through the feed pipe 25;

[0065] 3. After the pressurization of the tank body 6 is completed, the switch valve 3 23 and the vibrator 22 are opened, and the drive motor 1 is started to drive the screw feeding mechanism 20 to operate. At the same time, the weight change of the curing agent powder in the tank body 6 is monitored in real time by the weighing sensor 21. The rotation speed of the screw feeding mechanism 20 and the feeding amount of the curing agent powder are adjusted by the controller 40 to make the curing agent powder fall evenly and stably into the sprayer system 14. Then, the curing agent powder is mixed, compressed and pressurized in the pipeline mixer 30 through the high-pressure gas injection of the working nozzle 32, and the gas-solid two-phase fluid is transported to the feed port 16 of the drilling tool 47 of the drilling rig through the gas material conveying pipeline 15 by pneumatic conveying.

[0066] 4. When the multi-layer shear mixing pile drilling rig completes the current powder injection pile, the controller 40 is used to close the air sources and the switch valves, and the drilling rig is moved to the next pile position, and the above construction steps are implemented in a loop to construct the next powder injection pile. Thereafter, the above powder injection pile construction process is repeated until all powder injection pile construction is completed with high quality, and finally the bearing capacity of the composite foundation of the container yard floor required by the design is achieved.

[0067] Embodiment 2:

[0068] The engineering background of this embodiment is the construction of a strong core composite pile for a large commercial building pile foundation. The design pile length of the mixing pile is 20m, the pile diameter is 800mm, the length of the PHC pipe pile is 20m, the pile diameter is 600mm, and the design ultimate bearing capacity of the single pile is 3200kN. The engineering site is covered with a double-layer foundation, which is ① a silty clay layer with a thickness of 18m, a water content of w=77%, e=1.55, SPT=3~9, and ② a silty clay layer with a thickness of 9m, a water content of w=58%, e=1.18, SPT=12~18; 425 grade cement is used as a curing agent, and the particle size of the cement is required to be no more than 45μm, and the cement addition amount is 18%. The construction requires that the delivery pressure of the gas-solid two-phase flow at the faucet feed port 16 of the drilling tool 47 shall not be less than 0.34MPa. Therefore, the pressure of the initial compressed air provided by the gas source is required to be 0.65MPa, and the air pressure in the tank 66 is not less than 0.30MPa. During the construction, a 20tm high-torque dual-channel multi-layer mutual shear mixing pile drilling rig is used for cement powder injection pile construction. The powder injection pile construction adopts the two-mixing and one-spraying construction process, and the PHC pipe pile construction adopts the holding pressure construction process.

[0069] like Figures 6 to 8 As shown, the general structure of this embodiment is the same as that of the first embodiment, and the differences are as follows:

[0070] like Figure 6 As shown, in this embodiment, the cone angle at the bottom of the tank body 6 is 80°, and the tank body 6 can withstand a maximum pressure of 8 Bar. Since the volume of the solidified material used for the single engineering pile used in this embodiment is about 3 cubic meters, the use of a tank body 6 with a volume of 4 cubic meters can ensure the continuous feeding of a single pile. Four vibrators 22 are arranged on the conical slope at the lower part of the tank body 6, which are responsible for vibrating the cement powder during feeding. The tank body bracket 7 is provided with a total of four supporting points responsible for supporting the tank body 6, and each supporting point is provided with a weighing sensor 21, which is responsible for real-time weight monitoring of the cement powder in the tank to ensure uniform and stable feeding of the spiral conveying mechanism. In this structure, a spiral blade 29 with an inclination angle of 21° is provided on the screw 27 of the spiral conveying mechanism, and the diameter of the spiral blade 29 is 32 cm. A feeding pipe 25 with a diameter of 32 cm is provided at the bottom of the tank body 6, and the cement powder is transported from the feeding pipe 25 to the cylindrical receiving chamber 33 at the lower part, as shown in FIG. Figure 7 shown.

[0071] like Figure 8 As shown, in addition, since a dual-channel multi-layer shear mixing pile drilling rig is used in the construction of this embodiment, and a dual-channel powder injection pile construction method in which gas-solid two-phase fluid and high-pressure gas are simultaneously transported is adopted, on the basis of Example 1, a second air compressor 45 is added to the air source, and a high-pressure delivery hose 46 is added to separately transport additional high-pressure gas. A high-pressure hose pipeline with an inner diameter of 25 mm is used to transport pure high-pressure gas to the air intake pipeline at the top of the drilling tool 47 at a pressure of 0.34 MPa.

[0072] Embodiment three:

[0073] The structure of the vertical spiral feeding and injection device in this embodiment is generally similar to that in the first and second embodiments; the difference is that:

[0074] like Fig. 9 , 10 As shown, the tank body 6 in this embodiment can withstand a maximum pressure of 7 Bar. Since the volume of the solidified material used for the single powder injection pile used in this embodiment is 2 cubic meters, the volume of the tank body 6 to be used is 2.5 cubic meters, which can meet the continuous feeding of a single powder injection pile. Two vibrators 22 are arranged on the conical slope at the lower part of the tank body 6, which are responsible for vibrating the powder during feeding. The tank body bracket 7 is provided with three supporting points to support the tank body 6. Similarly, each supporting point is provided with a weighing sensor 21 to monitor the real-time weight of the powder in the tank, ensure quantitative and uniform feeding and record the feeding amount per linear meter of the powder injection pile. The structure of the receiving chamber 33 in this embodiment is consistent with that in the second embodiment.

[0075] In addition, the inclination angle and diameter of the spiral blade 29 and the structural form of the discharge pipe 25 in this embodiment are different from those in Example 2. Specifically, in this embodiment, a spiral blade 29 with an inclination angle of 20° is arranged on the spiral feeding structure, and the diameter of the spiral blade 29 is 27 cm. The discharge pipe 25 presents a gradually shrinking frustum-like shape, and the internal diameter gradually decreases from 27 cm to 20 cm. The internal spiral blade 29 changes diameter as the discharge pipe 25 gradually decreases. The variable diameter spiral will cause the curing agent powder moving downward to be compacted, further ensuring the sealing of the discharge pipe 25.

[0076] Embodiment 4:

[0077] The structure of the vertical spiral feeding and injection device in this embodiment is substantially similar to that in the first, second and third embodiments; the difference is that:

[0078] like Figures 11 to 13As shown, in this embodiment, the top cover of the tank body 6 is a plane, and the bottom cone angle is 76°. The tank body 6 can withstand a maximum pressure of 8 Bar. The volume of the solidified material used for the powder injection pile single pile used in this embodiment is 3.2 cubic meters, so the volume of the tank body 6 to be used is 4 cubic meters, which can ensure the continuous feeding of the powder injection pile. The spiral feeding structure in this embodiment is vertically arranged on the inner center axis of the tank body 6, and the motor assembly is arranged at the bottom of the tank body 6. At this time, a top support bearing 24 needs to be arranged on the top of the tank body 6 to support and seal the upper end of the screw 27. The lower end of the screw 27 passes through the receiving chamber 33 and is connected to the power output shaft of the motor assembly; the motor assembly is connected to the tank bracket 7 at the bottom of the tank body 6 or is directly supported and fixed on the ground through a fixed seat.

[0079] In addition, in this embodiment, since the motor assembly is arranged at the lower end of the tank body 6, and the lower end of the screw 27 passes through the receiving chamber 33, the injection pipe 26 in this structure needs to be improved accordingly, such as Fig.12 , 13 As shown, the injection pipe 26 is divided into two injection pipe branches 261 after entering the receiving chamber 33. The injection pipe branches 261 are distributed in a ring shape, and the middle position of the ring structure can allow the screw 27 to pass vertically. In the receiving chamber 33, near the entrance of the pipeline mixer 30, the two injection pipe branches 261 are merged into one pipeline to provide high-pressure and high-speed gas to the working nozzle 32.

[0080] In this embodiment, Fig.11 As shown, the motor assembly is arranged at the bottom of the tank body 6, and is supported and fixed by a tank body bracket 7 or a dedicated fixing seat, so that the lower end of the screw 27 has a stable support, and the upper end of the screw 27 is rotatably connected to the top of the tank body 6 through the top support bearing 24, thereby ensuring that both the upper and lower ends of the screw 27 have a stable support. Compared with the structure in which the motor assembly is arranged on the top of the tank body 6 in Examples 1 to 3, the screw 27 will not have radial deflection during rotation, thereby ensuring smooth and accurate downward conveying of the curing agent powder.

[0081] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A vertical spiral feeding injection device, characterized in that: The invention comprises a tank body (6), a screw feeding mechanism (20), an ejector system (14) and a controller (40), wherein the screw feeding mechanism (20) is vertically connected to the tank body (6) and is located on the central axis thereof, and the ejector system (14) comprises a receiving chamber (33), a pipeline mixer (30), an air intake assembly and an air material conveying pipeline (15), wherein the discharge port at the bottom of the tank body (6) is connected to the inlet of the receiving chamber (33), and the outlet of the receiving chamber (33) is connected to the pipeline mixer (30); one end of the air intake assembly is connected to an external air source, and the other end is connected to the receiving chamber (33) through an ejector, and the curing agent powder conveyed in the tank body (6) is mixed and compressed by the pipeline mixer (30) under the action of high-pressure gas injection, and then pneumatically conveyed to the main feed channel of the stirring drill (48) through the air material conveying pipeline (15); The air intake assembly comprises a high-pressure air supply pipe (8) and a tank body pressurizing pipe (5), the air outlet end of the high-pressure air supply pipe (8) is connected to the receiving chamber (33), one end of the tank body pressurizing pipe (5) is connected to the high-pressure air supply pipe (8), and the other end is connected to the top of the tank body (6), and the tank body pressurizing pipe (5) is connected to a switch valve four (41); the top of the tank body (6) is provided with a switch valve one (17) for opening and closing the feed port (16), the tank body (6) is connected to a pressure gauge one (3) and a switch valve two (18) for opening and closing the exhaust port (19), and the lower end of the tank body (6) is connected to the A switch valve three (23) is provided at the inlet connection of the receiving chamber (33); a regulating valve (11) for controlling the intake air flow rate, a safety valve two (10), a pressure gauge two (13) and a gas flow meter (12) are connected to the high-pressure air supply pipe (8); a gas source switch (9) is connected to the high-pressure air supply pipe (8); the switch valve four (41), the switch valve one (17), the pressure gauge one (3), the switch valve two (18), the switch valve three (23), the regulating valve (11), the pressure gauge two (13), the gas flow meter (12) and the gas source switch (9) are all connected to the controller (40) via electrical signals.

2. The vertical spiral feeding and injection device according to claim 1 is characterized in that: A tank support (7) is provided at the lower end of the tank body (6), a weighing sensor (21) is connected to the upper end of the tank support (7), the outer wall of the tank body (6) is supported on the weighing sensor (21) through a plurality of fulcrums, and the weighing sensor (21) is connected to the controller (40) via an electrical signal.

3. The vertical spiral feeding and injection device according to claim 1 is characterized in that: The screw feeding mechanism (20) comprises a screw (27) and a motor assembly, wherein the screw (27) is rotatably connected in the tank body (6) in the vertical direction, and the motor assembly is connected to the top or bottom of the tank body (6) and is used to drive the screw (27) to rotate; a continuous spiral blade (29) is arranged on the outer wall of the lower end of the screw (27), and a plurality of spirally distributed stirring blades (28) are arranged on the outer wall of the upper end of the screw (27); and the motor assembly is connected to the controller (40) via electrical signals.

4. The vertical spiral feeding and injection device according to claim 3 is characterized in that: The stirring blade (28) comprises a fixed blade (281), a rotating shaft (282) and an expansion blade (283); the fixed blade (281) and the expansion blade (283) are rotationally connected via the rotating shaft (282); when the screw (27) rotates forward, the expansion blade (283) rotates outward and expands; and when the expansion blade (283) is fully expanded, the total length of the stirring blade (28) is smaller than the diameter of the tank body (6); when the screw (27) rotates reversely, the expansion blade (283) rotates inward and retracts.

5. The vertical spiral feeding and injection device according to claim 3 or 4, characterized in that: When the motor assembly is connected to the bottom of the tank body (6), the motor assembly is connected to the tank body bracket (7) at the bottom of the tank body (6) or is directly fixed to the ground through a fixed seat support, the upper end of the screw rod (27) is rotatably connected to the top wall of the tank body (6), and the lower end of the screw rod (27) passes through the receiving chamber (33) and is connected to the power output shaft of the motor assembly.

6. The vertical spiral feeding and injection device according to claim 3 is characterized in that: The bottom of the tank body (6) is connected to a feed pipe (25) communicating with its inner cavity, and the lower end of the feed pipe (25) is connected to the entrance of the receiving chamber (33); the gap between the radial outer edge of the spiral blade (29) and the inner wall of the feed pipe (25) is less than 1 mm.

7. The vertical spiral feeding and injection device according to claim 1 is characterized in that: The injector comprises an injection pipe (26) and a working nozzle (32), and the cross-sectional midlines of the injection pipe (26), the working nozzle (32) and the pipeline mixer (30) are on the same axis; the pipeline mixer (30) comprises a contraction tube (301), a mixing tube (302) and a diffusion tube (303) connected in sequence, and the outlet of the receiving chamber (33) is connected to the inlet of the contraction tube (301); the contraction tube (301) and the diffusion tube (303) are both tapered tubes, the mixing tube (302) is a cylindrical tube, the large-diameter end of the contraction tube (301) is connected to the outlet of the receiving chamber (33), the small-diameter end of the contraction tube (301) is connected to one end of the mixing tube (302), the other end of the contraction tube (301) is connected to the small-diameter end of the diffusion tube (303), and the large-diameter end of the diffusion tube (303) is connected to the inlet of the gas material conveying pipeline (15).

8. The vertical spiral feeding and injection device according to claim 7 is characterized in that: The outlet end of the working nozzle (32) is located in the receiving chamber (33) to the right of the perpendicular midline of the receiving chamber (33), and the inner hole diameter of the jet port (321) of the working nozzle (32) is a structure that first decreases and then increases.

9. The vertical spiral feeding and injection device according to claim 1, characterized in that: The lower end of the tank body (6) is a conical structure with a larger upper portion and a smaller lower portion, and a plurality of vibrators (22) are connected to the conical inclined surface at the lower portion of the tank body (6).

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