Chemical adding device for high-pressure rotary jet grouting
By designing an intelligent dosing device, the problems of uneven agent addition and complex equipment were solved, and uniform mixing and automatic control of the agent and cement slurry were achieved, which improved the foundation reinforcement effect and reduced construction costs.
Patent Information
- Application Number
- CN202422849892.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-21
AI Technical Summary
In the existing high-pressure rotary jet grouting pile construction, the agent is added unevenly, making it difficult to achieve intelligent adjustment, resulting in inconsistent reinforcement effects. In addition, the dosing device has a complex structure and is difficult to maintain.
A dosing device consisting of a stirring box and a stirring mechanism was designed. It was equipped with a motor-driven stirring shaft and blades, and a liquid outlet and a liquid outlet head were set to ensure uniform mixing of the drugs. The addition of drugs was automatically controlled through a controller and a sensor, and precise adjustment was achieved by combining a magnetic fixed movable baffle and a flow sensor.
It achieves uniform mixing of the agent and cement slurry, improves the foundation reinforcement effect, reduces construction errors and manual operations, and reduces construction costs.
Smart Images
Figure CN223423228U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of geotechnical engineering, in particular to a dosing device for high-pressure rotary jet grouting. Background Art
[0002] High-pressure rotary jet piles are a foundation treatment process that uses a high-pressure nozzle to inject cement slurry and other materials into the soil layer, mix them with the soil, and form a reinforced body. In the construction of high-pressure rotary jet piles, different agents need to be added to the cement slurry according to the set ratio, and the two need to be fully mixed before the cement slurry and agents enter the soil layer. High-pressure rotary jet pile technology is widely used in foundation reinforcement, but the existing technology has several key problems in the construction process: 1. Uneven addition of agents: Traditional dosing devices cannot ensure uniform mixing of agents and cement slurry, resulting in poor reinforcement effects in local strata. 2. The amount of dosing is difficult to control: It is mostly manual or mechanically controlled, lacking intelligent regulation, and it is difficult to adjust the proportion of agents in real time according to different soil conditions. 3. Complex construction equipment: The existing dosing device has a complex structure and is difficult to maintain, which increases construction costs and time. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this utility model provides a dosing device for high-pressure rotary jet grouting, resolving existing issues such as insufficient mixing of chemicals and cement slurry, which can lead to inconsistent reinforcement results and difficulty adjusting chemical addition according to different construction conditions. This device enables automated and precise chemical addition during the construction process, ensuring uniform mixing of cement slurry and chemicals, improving foundation reinforcement effectiveness while reducing construction costs.
[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:
[0005] The utility model discloses a dosing device for high-pressure rotary jet grouting, comprising a stirring box, wherein a stirring mechanism driven by a motor is vertically arranged in the stirring box, wherein the stirring mechanism comprises a stirring shaft and blades arranged on the stirring shaft, wherein a cavity with one end passing through the top end thereof is provided in the stirring shaft, wherein the cavity is located above the blades, and a liquid outlet hole is provided in the circumferential direction of the cavity near the bottom thereof.
[0006] Preferably, a liquid outlet head is provided on the circumference of the cavity near the bottom thereof, an inclined opening is provided at the bottom of the liquid outlet head, and the liquid outlet hole is arranged crosswise with the liquid outlet head.
[0007] Preferably, a hopper is provided on the side wall of the mixing box near the top thereof, a feed port communicating with the hopper is provided on the side wall of the mixing box, and a movable baffle is hinged in the feed port.
[0008] Preferably, the movable baffle is fixed in the feed port via a rotating shaft, and baffles are vertically provided on both sides of the feed port, and the baffles are provided on the outward side of the feed port and abut against the movable baffle.
[0009] Preferably, magnetic strips are embedded on the surfaces of the baffle bar that contact the movable baffle, so that the movable baffle and the baffle bar are fixed by magnetic attraction.
[0010] Preferably, the bottom surface of the feed port is an inclined surface inclined downward toward the mixing box, and an "L"-shaped notch adapted to the bottom of the movable baffle is provided on the inclined surface. When the baffle contacts the movable baffle, the bottom end of the movable baffle is stuck in the notch.
[0011] Preferably, one end of the stirring shaft extending out of the stirring box is connected to a dosing tube through a bearing, the other end of the dosing tube is connected to a mixing box, a magnetic stirrer is provided at the bottom of the mixing box, a stirring bar is provided in the mixing box, a dosing pump and a first flow sensor are provided on the dosing tube, and a plurality of dosing ports are provided on the top of the mixing box.
[0012] Preferably, the medicine adding port is detachably connected to a medicine box via a delivery pipe, a pump and a flow meter are respectively provided on the delivery pipe, and a liquid infusion port is provided on the medicine box.
[0013] Preferably, a water inlet is provided at the top of the mixing box, a slurry outlet pipe is provided at the bottom, and a valve is provided on the slurry outlet pipe.
[0014] Preferably, a controller is provided on the side wall of the mixing box, and the controller is electrically connected to a soil hardness sensor, a pressure sensor and a second flow sensor, and the pressure sensor and the second flow sensor are used to detect the pressure and flow of the cement slurry; the dosing pump, pump machine, first flow sensor, flow meter, and motor are all controlled by the controller.
[0015] The utility model has the following beneficial effects:
[0016] 1. This utility model uses multiple reagent tanks to simultaneously add reagents to a mixing tank, which are then pumped into the mixing tank via a dosing pump, achieving precise control of the reagents. The integrated mixing tank ensures that the cement slurry and reagents are thoroughly mixed before entering the soil layer, improving reinforcement effectiveness and reducing construction errors. The controller automatically adjusts the dosing ratio based on soil conditions, achieving automated operation and reducing manual intervention.
[0017] 2. The intelligent dosing device disclosed in the utility model can ensure uniform mixing of cement slurry and chemicals, improve the effect of foundation reinforcement, and reduce chemical waste and errors in manual operation. It has wide applicability and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the structure of the utility model;
[0019] Figure 2 for Figure 1 A top view of
[0020] Figure 3 is a cross-sectional view of the stirring shaft;
[0021] Figure 4 Schematic diagram of the movable baffle and baffle;
[0022] In the figure: mixing box 1, motor 2, stirring shaft 3, blade 4, cavity 5, liquid outlet 6, liquid outlet head 7, opening 8, feeding hopper 9, feed port 10, movable baffle 11, baffle 12, bearing 13, dosing pipe 14, mixing box 15, magnetic stirrer 16, dosing pump 17, dosing port 18, delivery pipe 19, medicine box 20, pump 21, flow meter 22, liquid replenishment port 23, water inlet 24, slurry outlet pipe 25, controller 26, soil hardness sensor 27, first flow sensor 28. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0024] Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.
[0025] refer to Figures 1-4The utility model discloses a dosing device for high-pressure rotary jet grouting, comprising a mixing box 1, wherein a stirring mechanism driven by a motor 2 is vertically arranged in the mixing box 1, wherein the stirring mechanism comprises a stirring shaft 3 and blades 4 arranged on the stirring shaft 3, and the stirring shaft and the mixing box can be fixed by bearings, and a cavity 5 with one end passing through the top end thereof is provided in the mixing shaft 3, and the cavity 5 is located above the blades 4, and a liquid outlet hole 6 is provided in the circumferential direction of the cavity 5 near the bottom thereof. A plurality of liquid outlet holes are provided as needed, and are radially arranged. During the rotation of the stirring mechanism, the agent is input into the stirring shaft and sprayed out through the liquid outlet hole, so as to avoid the agent added to the mixing box being concentrated in one place, resulting in uneven mixing of the cement slurry and the agent. The motor drives the stirring shaft to rotate, driving the blades to mix and stir the cement slurry and the agent. The motor and the stirring shaft can be driven by gears or belts. As one embodiment, the rotation speed of the blade is 300-1000 rpm (adjustable), the volume of the mixing box can be 50 L, and the mixing time is 3-5 seconds (adjusted according to the type of reagent and cement slurry characteristics).
[0026] Furthermore, the cavity 5 is provided with a liquid outlet head 7 on the circumference near the bottom thereof, and an inclined opening 8 is provided at the bottom of the liquid outlet head 7, and the liquid outlet hole 6 is cross-set with the liquid outlet head 7. It should be noted that the liquid outlet head and the liquid outlet hole can be located on the same plane, and the provision of the liquid outlet head can increase the diameter range when the agent is sprayed. In the case where only the liquid outlet hole is provided, the stirring shaft rotates, and the agent will be sprayed toward the inner wall surface of the stirring box, while there is no agent in the area near the stirring shaft. Therefore, a liquid outlet head is provided to solve this problem. The liquid outlet head is provided horizontally, and can be understood as a short tube with one end closed, and the open end is connected to the stirring shaft and communicates with the cavity. The opening provided on the liquid outlet head is an oblique opening, which is obliquely cut from the end face to the bottom face of the liquid outlet head so that the opening has a certain inclination angle, such as Figure 3 As shown, the opening is tilted away from the stirring shaft, so that when the drug is sprayed from the liquid outlet head, it can be sprayed in the area near the stirring shaft. The tilt angles of the openings of the multiple liquid outlet heads can be consistent or different. At the same time, multiple liquid outlet holes and liquid outlet heads are provided as needed, preferably in a cross-shaped arrangement, so that the sprayed drug covers a wider and more uniform area, thereby increasing the uniformity of the mixing of the cement slurry and the drug.
[0027] Furthermore, a hopper 9 is provided on the side wall of the mixing box 1 near its top. A feed port 10 communicating with the hopper 9 is provided on the side wall of the mixing box 1. The bottom surface of the feed port 10 is an inclined surface that slopes downward toward the mixing box 1 to prevent cement and other materials from accumulating at the bottom of the feed port. A movable baffle 11 is hingedly connected to the feed port 10 and is adapted to close the feed port.
[0028] Specifically, the movable baffle 11 is fixed within the feed port 10 via a rotating shaft. The rotating shaft is fixed horizontally near the top of the feed port and passes through the movable baffle, enabling it to rotate about the rotating shaft. Vertically disposed on either side of the feed port 10 are baffles 12, which are positioned outward from the feed port 10 and abut against the movable baffle 11. It should be noted that the provision of the baffles prevents the movable baffle from rotating outward, which could prevent material or cement slurry in the mixing tank from leaking through the feed port in extreme circumstances.
[0029] Furthermore, in order to prevent the movable baffle from shaking in the feed port, corresponding magnetic strips are embedded on the contact surfaces of the baffle 12 and the movable baffle 11, so that the movable baffle 11 and the baffle 12 are magnetically fixed. Figure 4 As shown, a retaining bar is positioned near the middle of the movable baffle to prevent it from interfering with its rotation toward the mixing chamber. When material is poured into the hopper, the movable baffle opens under the force of gravity, allowing the material to fall into the mixing chamber. When the hopper is empty, the movable baffle, while oscillating, is reset and secured by the magnetic strip. Alternatively, a torsion spring can be installed on the rotating shaft to restrain the movable baffle and reset it after opening the feed port.
[0030] Furthermore, in order to prevent the movable baffle from directly hitting the bottom inclined surface of the feed port during the resetting process, an "L"-shaped notch adapted to the bottom of the movable baffle 11 is opened on the inclined surface. When the baffle 12 contacts the movable baffle 11, the bottom end of the movable baffle 11 is stuck in the notch, that is, the opening of the notch faces the mixing box, so that the bottom end of the movable baffle directly hits or directly resists the vertical surface of the notch when resetting.
[0031] Furthermore, to enable dosing of the reagents into the cavity, a dosing tube 14 is connected to the end of the stirring shaft 3 extending outside the stirring box 1 via a bearing 13. The dosing tube is fixed to the open end of the stirring shaft cavity via a bearing, and a sealed bearing is used to prevent leakage. The other end of the dosing tube 14 is connected to a mixing box 15, which is used to mix and stir multiple reagents. A magnetic stirrer 16 is provided at the bottom of the mixing box 15, and a stir bar is provided inside the mixing box 15. A dosing pump 17 and a first flow sensor 28 are provided on the dosing tube 14. The dosing pump adds the mixed reagents in the mixing box to the cavity and then sprays them into the stirring box. The top of the mixing box 15 is provided with multiple dosing ports 18. The provision of multiple dosing ports allows for the installation of multiple reagent boxes, each of which can correspond to a different reagent. The addition of multiple reagents is controlled by a controller, which is suitable for different types of reagents such as curing agents and accelerators. When in use, the pressure of the dosing pump is 10-20 MPa (adjustable), the flow rate of the dosing pipe is 0.5-5 L / min, and the control accuracy is ±0.1 L / min. The material of the dosing pipe is corrosion-resistant alloy, which is suitable for highly corrosive chemicals.
[0032] Specifically, the dosing port 18 is detachably connected to a medicine box 20 via a delivery tube 19. The delivery tube 19 is equipped with a pump 21 and a flow meter 22. The medicine box 20 is also equipped with a rehydration port 23. It should be noted that one end of the delivery tube can be directly inserted into the dosing port or connected via a pipe joint. The medicine in the medicine box is pumped into the mixing box via a pump, while the flow meter strictly controls the amount of each medicine added.
[0033] Furthermore, the mixing tank 1 is provided with a water inlet 24 at the top and a slurry outlet pipe 25 at the bottom. The slurry outlet pipe 25 is provided with a valve. The water inlet adds water to the mixing tank via a water inlet pipe and a water pump. The slurry outlet pipe is pumped into the grouting pipe by a high-pressure slurry pump for rotary spraying to form the reinforcement body.
[0034] A controller 26 is provided on the side wall of the mixing box 1. The controller 26 is electrically connected to a soil hardness sensor 27, a pressure sensor and a second flow sensor. The pressure sensor and the second flow sensor are used to detect the pressure and flow of the cement slurry; the dosing pump 17, the pump 21, the first flow sensor 28, the flow meter 22 and the motor 2 are all controlled by the controller 26. It should be noted that when not in use, the soil hardness sensor is stuck on the outer wall of the mixing box for storage. The pressure sensor and the second flow sensor are respectively installed at key positions of the dosing pump and the grouting pipe (the grouting pipe is a pipe extending into the borehole, which is the prior art) to monitor the pressure and flow of the cement slurry. The installation of the sensor position is the prior art. The soil hardness sensor is installed near the drill bit to ensure that it can detect the soil hardness in real time.
[0035] In this embodiment, the parameters such as cement slurry flow, pressure, soil hardness, etc. during the construction process are monitored in real time by sensors and fed back to the controller. Then, the reagent ratio is automatically adjusted according to the construction parameters set by the controller. Among them, the pressure sensor: the range is 0-100MPa, and the accuracy is ±0.5MPa. The second flow sensor (cement slurry flow): the range is 0-10L / min, and the accuracy is ±0.1L / min. The soil hardness sensor: through sound wave conduction, the soil hardness is detected in real time, and the range is 0-100MPa. The construction depth is 0-50m, and the reagent ratio setting range is: 1%-10% (relative to the cement slurry volume).
[0036] When using this utility model, according to the construction design requirements, prepare the curing agent, accelerator and other agents, and store them in the corresponding agent box according to the properties of the agents. And check the preparation of the cement slurry to ensure that the fluidity and consistency of the slurry meet the design requirements and the fluidity of the slurry is within the range of 180-220mm (standard slump).
[0037] Then, according to the construction design requirements, input the initial parameters such as soil layer type, construction depth, target reinforcement strength, etc. The controller automatically calculates and sets the reagent ratio, for example: the curing agent accounts for 5% of the slurry volume, and the accelerator accounts for 2%. Then pump the reagent into the mixing box according to the amount and stir and mix. Then use the dosing pump to pump the mixed reagent into the cement slurry in the mixing box. At the same time, start the motor to start stirring, adjust the blade speed to 500rpm, and pump the reagent while stirring. Through the controller, test whether the sensor data transmission is normal, and confirm that the data can be fed back to the intelligent operation interface in real time. Observe the flow, pressure and other parameters of the slurry and reagent fed back by the intelligent interface to confirm the consistency of the data. If any abnormality occurs, stop the equipment and make adjustments.
[0038] Furthermore, the dosing ratio and flow rate are automatically adjusted based on the set parameters and real-time feedback. During equipment operation, the controller will adjust the dosing ratio in real time according to changes in soil hardness to ensure uniform mixing of the agent and slurry. For example, the total slurry flow rate is set to 100L / min, and the agent ratio is adjusted in real time according to the soil hardness, maintaining the agent ratio between 5% and 8%. When the soil hardness exceeds the set value, the controller automatically increases the curing agent ratio and reduces the slurry flow rate accordingly to ensure construction quality.
[0039] After completing the application, shut down the dosing pump, mixing tank, and controller in sequence. After shutting down, flush the equipment pipes with clean water to prevent slurry residue. The cleaning time should be at least 15 minutes. Inspect the key components of the dosing pump and mixing tank to confirm that the blades are not worn and the pump body is leak-free. Record the equipment's usage and regularly replace worn parts to ensure equipment stability for the next application.
[0040] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 should not be understood as limitations on the present invention.
[0041] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.
Claims
1. A dosing device for high-pressure rotary jet grouting, comprising a stirring box (1), characterized in that: A stirring mechanism driven by a motor (2) is vertically arranged in the stirring box (1), the stirring mechanism comprising a stirring shaft (3) and a blade (4) arranged on the stirring shaft (3), a cavity (5) with one end penetrating the top end thereof being arranged in the stirring shaft (3), the cavity (5) being located above the blade (4), and a liquid outlet hole (6) being arranged in the circumferential direction of the cavity (5) near the bottom thereof.
2. A dosing device for high-pressure rotary grouting according to claim 1, characterized in that: The cavity (5) is provided with a liquid outlet head (7) on the circumference near the bottom thereof, the bottom of the liquid outlet head (7) is provided with an inclined opening (8), and the liquid outlet hole (6) and the liquid outlet head (7) are arranged crosswise.
3. A dosing device for high-pressure rotary grouting according to claim 1, characterized in that: A feeding hopper (9) is provided on the side wall of the mixing box (1) near the top thereof, and a feeding port (10) communicating with the feeding hopper (9) is provided on the side wall of the mixing box (1), and a movable baffle (11) is hinged in the feeding port (10).
4. A dosing device for high-pressure rotary jet grouting according to claim 3, characterized in that: The movable baffle (11) is fixed in the feed port (10) via a rotating shaft, and baffles (12) are vertically arranged on both sides of the feed port (10). The baffles (12) are arranged on the outward side of the feed port (10) and abut against the movable baffle (11).
5. A dosing device for high-pressure rotary grouting according to claim 4, characterized in that: Magnetic strips are respectively embedded on the surfaces of the baffle (12) and the movable baffle (11) in contact with each other, so that the movable baffle (11) and the baffle (12) are fixed by magnetic attraction.
6. A dosing device for high-pressure rotary jet grouting according to claim 4 or 5, characterized in that: The bottom surface of the feed port (10) is an inclined surface that tilts downward toward the mixing box (1). An "L"-shaped notch is provided on the inclined surface to match the bottom of the movable baffle (11). When the baffle (12) contacts the movable baffle (11), the bottom end of the movable baffle (11) is inserted into the notch.
7. The dosing device for high-pressure rotary grouting according to claim 1, characterized in that: One end of the stirring shaft (3) extending out of the stirring box (1) is connected to a dosing pipe (14) through a bearing (13), and the other end of the dosing pipe (14) is connected to a mixing box (15). A magnetic stirrer (16) is provided at the bottom of the mixing box (15), a stirring rod is provided in the mixing box (15), a dosing pump (17) and a first flow sensor (28) are provided on the dosing pipe (14), and a plurality of dosing ports (18) are provided on the top of the mixing box (15).
8. A dosing device for high-pressure rotary jet grouting according to claim 7, characterized in that: The medicine adding port (18) is detachably connected to a medicine box (20) via a delivery pipe (19), a pump (21) and a flow meter (22) are respectively provided on the delivery pipe (19), and a liquid infusion port (23) is provided on the medicine box (20).
9. The dosing device for high-pressure rotary grouting according to claim 1, characterized in that: The top of the mixing box (1) is provided with a water inlet (24), and the bottom is provided with a slurry outlet pipe (25), and the slurry outlet pipe (25) is provided with a valve.
10. The dosing device for high-pressure rotary grouting according to claim 8, characterized in that: A controller (26) is provided on the side wall of the mixing box (1), and the controller (26) is electrically connected to a soil hardness sensor (27), a pressure sensor, and a second flow sensor, wherein the pressure sensor and the second flow sensor are used to detect the pressure and flow of the cement slurry; the dosing pump (17), the pump (21), the first flow sensor (28), the flow meter (22), and the motor (2) are all controlled by the controller (26).