A drilling graded continuous aggregate pouring device and pouring method

Abstract

The present invention discloses a drilling and grading continuous aggregate pouring device and a pouring method. The drilling and grading continuous aggregate pouring device is provided with a water pipe, a mixing bin and a feed pipe connected in sequence; a sorting screen assembly is connected to the mixing bin; the sorting screen assembly is filled with aggregate; and a stirring auxiliary assembly is further provided. The stirring auxiliary assembly is used to stir and impact the contained aggregate on the upper part of the sorting screen with a high-pressure water flow, so that the aggregate passes through the sorting screen assembly into the mixing bin, and then the aggregate in the mixing bin is transported along the feed pipe by the water flow transported by the water pipe. The present invention forms a fully enclosed pouring system, that is, jet water jets and stirs the aggregate, forming a water-sand mixed fluid similar to a debris flow, forming a fully covered water film on the sorting screen. The water replaces the air between the aggregate particles, effectively preventing air from entering the aggregate pouring pipeline system from two aspects, avoiding the formation of an air column that causes blockage of the drill hole and even causes water and sand spraying accidents.

Description

Technical Field

[0001] The invention belongs to the technical field of rapid plugging engineering for mine water inrush channels, and particularly relates to a drilling graded continuous aggregate pouring device and a pouring method. Background Art

[0002] In large-scale mine flood disaster rescue and control projects, channel interception under high water pressure differentials and dynamic water conditions often determines the success of the control project and is a key technical challenge in the water blocking process. Constructing "water plugs" by pouring aggregate into large water inrush channels and water passages is an effective method for interception and blocking.

[0003] Existing aggregate injection technology utilizes the negative pressure effect to carry aggregates of different grades through high-speed water flow, passing through a surface pipeline system and drilled holes into the water inrush channel, where they accumulate to form a water plug. While the technical principles are relatively mature, the following problems still exist in engineering applications:

[0004] 1) The rapid response mechanism for aggregate gradation, water injection flow rate, water-to-solid ratio, and negative pressure during injection lacks deterministic parameters, and the technical system is imperfect, impacting the effectiveness of treatment. Aggregate gradation, water-to-solid ratio, and water injection flow rate are key technical parameters for achieving channel closure during aggregate injection. Negative pressure is an important indicator for the response control of these key technical parameters. Existing injection methods often have a delayed response, leading to borehole blockage, repeated borehole sweeping, and artificially complex conditions within the borehole, significantly impacting project progress. Worse still, they can lead to the failure of the originally designed water-blocking plug and project failure.

[0005] 2) Air is brought into the borehole during grouting, which can easily cause bridging blockage in the hole, affecting the effectiveness of treatment, and inducing high-pressure water and sand spraying, causing great safety hazards. During the grouting process, the lower hopper is not closed. Under the negative pressure effect, the air between the air and aggregate particles is sucked into the borehole through the lower hopper mouth. On the one hand, the grouting negative pressure decreases, which can easily cause bridging blockage in the hole, seriously affecting the effectiveness of treatment; on the other hand, the air continues to gather and compress in the hole column, the grouting flow rate decreases, the negative pressure decreases, and the air accumulation amount and the air pressure in the hole reach a peak at the same time. The accumulated air quickly moves up along the borehole and is pushed to the feed pipeline and the lower hopper mouth. The pressure is instantly released, causing the high-pressure water and sand to be sprayed out of control, posing a great safety hazard.

[0006] 3) Aggregate pouring and grading are difficult, and are prone to being mixed with foreign matter and boulders of mismatched particle sizes, causing bridging and blockage in the holes, impacting the effectiveness of the project treatment. The initial stage of the treatment project required continuous pouring of large quantities of aggregates of different gradations within a unit timeframe. However, the on-site aggregates were damp and often mixed with foreign matter and boulders of mismatched particle sizes, making them difficult to screen and process. Large rocks, bricks, and other foreign matter frequently clogged the feed pipes or drill holes, seriously delaying the construction of the "water plugs" in the channel. Furthermore, the aggregates, under the scouring effect of strong runoff groundwater, diffused ineffectively, increasing project investment, extending the construction period, and making water blocking more difficult. Summary of the Invention

[0007] The present invention provides a drilling graded continuous aggregate pouring device and a pouring method to solve the problems of lack of definite parameter values ​​and delayed response in the adjustment and control of key technical parameters of aggregate pouring during the pouring process, air entering the borehole causing blockage or even uncontrolled injection of high-pressure water sand, and debris and aggregates with mismatched particle sizes entering the borehole causing blockage.

[0008] In order to solve the problems existing in the prior art, the technical solution of the present invention is:

[0009] A drilling and grading continuous aggregate pouring device is provided with a water pipe, a mixing bin and a material conveying pipe connected in sequence; a sorting screen assembly is connected to the mixing bin; the sorting screen assembly is filled with aggregate; and a stirring auxiliary assembly is also provided. The stirring auxiliary assembly uses a high-pressure water flow to stir and impact the contained aggregate at the upper part, so that it passes through the sorting screen assembly into the mixing bin, and then the water flow conveyed by the water pipe impacts and conveys the aggregate in the mixing bin along the material conveying pipe.

[0010] Optionally, the mixing chamber is a tubular cavity, and the inner diameter of the mixing chamber is larger than the inner diameter of the water pipe and / or the inner diameter of the material pipe.

[0011] Optionally, a jet nozzle is connected to the connecting end of the water pipe and the mixing chamber.

[0012] Optionally, the sorting screen assembly includes a plurality of sorting screens stacked sequentially from top to bottom; and the apertures of the sieve holes of the plurality of sorting screens increase sequentially.

[0013] Optionally, adjacent sorting screens are stacked and sealed by means of slots and sealing rings; and a drop hopper is provided at the bottom of the sorting screen connected to the mixing bin.

[0014] Optionally, the sorting screen assembly includes a first sorting screen, a second sorting screen and a third sorting screen arranged in sequence from top to bottom; the first sorting screen is provided with a first screen enclosure, a first screen mesh is provided on the bottom of the first screen enclosure, and a slot and a sealing ring are provided on the bottom edge of the first screen enclosure; the structure of the second sorting screen is the same as that of the first sorting screen; the third sorting screen is provided with a third screen enclosure, a third screen mesh is provided on the bottom of the third screen enclosure, and a drop hopper is provided under the third screen enclosure.

[0015] Optionally, the stirring auxiliary component is provided with a water hose, one end of the water hose is connected to a high-pressure nozzle, and the other end is connected to a first water pump.

[0016] A method for continuously pouring aggregate by drilling and grading is implemented using any of the apparatuses for continuously pouring aggregate by drilling and grading according to the present invention, and specifically comprises:

[0017] Step 1: Open the second water pump and the first valve to stabilize the water flow in the water pipe, and then transfer the aggregate to the sorting screen assembly;

[0018] Step 2: Turn on the first water pump and use the stirring auxiliary component to jet-stir the aggregate to fully mix the aggregate and water, forming a debris flow-like fluid that fully covers the sorting screen component to prevent air from entering the mixing chamber;

[0019] Step 3: Open the second valve, and the mixture of aggregate and water goes directly to the mixing chamber through the hopper. Under the action of the jet nozzle, the aggregate and a large amount of flowing water are mixed and further stirred in the mixing chamber to form a water-sand mixed fluid with good fluidity. The mixed fluid then passes through the feed pipe, the orifice sealer and the drilling casing to reach the target formation.

[0020] When the negative pressure in the feed pipe is 0.04-0.06 MPa, the water volume of the water pipe is controlled at 50-60 m3. 3 / h;

[0021] When the negative pressure in the feed pipe is 0.06-0.07 MPa, the water injection volume of the water pipe should be controlled at 60-80 m 3 / h;

[0022] When the negative pressure in the feed pipe is greater than 0.07 MPa, the water injection volume of the water pipe should be controlled at 80-100 m 3 / h.

[0023] Optionally, during the experimental pouring stage, when the negative pressure of the feed pipe is 0.04-0.06 MPa, the aggregate can be coarse sand with a particle size of 0.5-2.0 mm, and a 4.75 mm standard square hole stone sieve can be used for sorting and screening;

[0024] During the channel connection stage, when the negative pressure of the feed pipe is 0.06-0.07 MPa, the aggregate is selected as a sand and gravel mixture with a particle size of 1-5 mm, and a 9.5 mm standard square hole stone sieve is used for sorting and screening;

[0025] During the channel blocking stage, when the negative pressure value of the feed pipe is greater than 0.07MPa, the aggregate is selected to be gravel with a particle size of 5.0 to 15.0mm, and a 16.0mm standard square hole gravel sieve is used for sorting and screening.

[0026] Optionally, the material discharge speed during the pouring process: when the negative pressure value of the conveying pipe is 0.04-0.06MPa, the material discharge speed is controlled at 4-5t / h; when the negative pressure value of the conveying pipe is 0.06-0.07MPa, the material discharge speed is controlled at 6-8t / h; when the negative pressure value of the conveying pipe is greater than 0.07MPa, the material discharge speed is controlled at 10-15t / h;

[0027] During the experimental pouring stage, when the negative pressure of the feed pipe is 0.04-0.06 MPa, the water-solid ratio in the mixing bin is controlled at 12:1-10:1;

[0028] During the channel connection stage, when the negative pressure value of the feed pipe is 0.06-0.07 MPa, the water-solid ratio in the mixing bin is controlled at 10:1-8:1;

[0029] During the channel blocking stage, when the negative pressure value of the feed pipe is greater than 0.07 MPa, the water-solid ratio in the mixing bin is controlled at 8:1 to 6:1.

[0030] Compared with the prior art, the advantages of the present invention are as follows:

[0031] 1. The method of the present invention achieves rapid response control of key technical parameters and negative pressure during aggregate pouring, and has a clear adjustment and control method. During the aggregate pouring process, a negative pressure gauge reflects the changes in negative pressure in real time. The size of the sorting screen is adjusted according to the negative pressure to control the aggregate particle size for graded pouring. High-pressure water jet stirring is used to adjust the water-to-solid ratio and feeding speed, and the pouring water flow rate is adjusted to control the aggregate pouring strength.

[0032] 2. The method of the present invention forms a fully enclosed perfusion system, that is, the jet water formed by the high-pressure water gun is used to jet-stir the aggregate, forming a water-sand mixed fluid similar to a mudslide to form a fully covering water film on the sorting screen, which has a fully covering sealing effect on the lower hopper mouth. At the same time, water replaces the air between the aggregate particles, effectively preventing air from entering the aggregate perfusion pipeline system from two aspects, avoiding the formation of air columns that lead to borehole blockage and even water and sand spraying accidents; at the same time, the negative pressure value in the borehole can be monitored in real time by a negative pressure gauge. If the negative pressure decreases, the viscosity of the water-sand fluid is reduced, otherwise the viscosity of the water-sand fluid is increased, thereby realizing continuous perfusion of aggregate.

[0033] 3. In the device of the present invention, a jet nozzle is installed at the water inlet end of the mixing chamber to accelerate the water jet speed. The water-sand mixed fluid entering the mixing chamber is subjected to secondary jet stirring by the jet water, forming a fluid with better fluidity. Under the thrust of the jet water and the drainage effect of the negative pressure of the feed pipeline, this fluid can quickly pass through the feed pipeline and enter the drill hole;

[0034] 4. The present invention uses a high-pressure water gun for jet stirring, which reduces the number of manpower and labor intensity. One person can complete the unloading with a forklift, and the unloading is more uniform and easier to control the unloading speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic structural diagram of the drilling and grading continuous aggregate pouring device of the present invention;

[0036] Figure 2 for Figure 1 A schematic diagram of the structure of the sorting screen assembly;

[0037] The following are marked in the figure:

[0038] 1-stirring auxiliary assembly, 11-high-pressure nozzle, 12-first water pump;

[0039] 2- water pipe, 21- second water pump, 22- first valve, 23- flow meter, 24- jet nozzle;

[0040] 3-mixing chamber, 31-second valve;

[0041] 4- sorting screen assembly; 41- first sorting screen, 411- first screen enclosure, 412- first screen mesh, 413- slot, 414- sealing ring, 42- second sorting screen, 43- third sorting screen, 431- third screen enclosure, 432- third screen mesh, 433- dropping hopper;

[0042] 5-feeding pipe, 51-first negative pressure gauge;

[0043] 6-borehole casing, 61-hole sealer, 62-second negative pressure gauge, 7-aggregate, 8-water tank. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] Combine Figure 1 and 2The drilling and grading continuous pouring aggregate device of the present invention is provided with a water pipe 2, a mixing bin 3 and a material delivery pipe 5 connected in sequence; a sorting screen assembly 4 is connected to the mixing bin 3; the sorting screen assembly 4 is filled with aggregate 7; and a stirring auxiliary assembly 1 is also provided. The stirring auxiliary assembly 1 stirs and impacts the contained aggregate 7 at the upper part with high-pressure water flow, so that the aggregate passes through the sorting screen assembly 4 into the mixing bin 3, and then the water flow conveyed by the water pipe 2 impacts and transports the aggregate in the mixing bin 3 along the material delivery pipe 5. The present invention forms a fully enclosed perfusion system, that is, the jet water formed by the high-pressure water gun is used to jet-stir the aggregate, forming a water-sand mixed fluid similar to a mud-rock flow to form a fully covering water film on the sorting screen, which has a fully covering and sealing effect on the lower hopper mouth. At the same time, water replaces the air between the aggregate particles, effectively preventing air from entering the aggregate perfusion pipeline system from two aspects, avoiding the formation of air columns that cause borehole blockage and even cause water and sand spraying accidents; at the same time, the negative pressure value in the borehole can be monitored in real time through a negative pressure gauge. If the negative pressure decreases, the consistency of the water-sand fluid is reduced, and vice versa, the consistency of the water-sand fluid is increased, thereby realizing continuous perfusion of aggregate.

[0046] In the disclosed embodiment, mixing chamber 3 is a tubular cavity with an inner diameter larger than that of water pipe 2 and / or material pipe 5. The large-capacity mixing chamber 3 accommodates the falling aggregate 7 and also receives jet water from water pipe 2 on one side, which not only mixes and agitates the aggregate 7 within the mixing chamber but also allows it to flow out quickly on the other side, achieving continuous and rapid pouring.

[0047] In the embodiment of the present disclosure, a jet nozzle 24 is connected to the connection end of the water delivery pipe 2 and the mixing chamber 3. In the device of the present invention, the installation of the jet nozzle 24 at the water inlet end of the mixing chamber 3 accelerates the water jet speed. The jet water is used to perform a secondary jet agitation on the water-sand mixed fluid entering the mixing chamber 3, forming a fluid with better fluidity. This fluid can quickly pass through the feed pipe 5 and enter the borehole under the thrust of the jet water and the drainage effect of the negative pressure of the feed pipe 5.

[0048] In the disclosed embodiment, the sorting screen assembly 4 includes multiple sorting screens stacked sequentially from top to bottom, with the apertures of the multiple sorting screens increasing in size. The arrangement of multiple sorting screens can meet the requirements of aggregates of varying particle sizes, and the increasing apertures from top to bottom ensure that particle size control is performed by the topmost sorting screen, facilitating replacement and operation.

[0049] In the disclosed embodiment, adjacent sorting screens are stacked and sealed together via slots 413 and sealing rings 414. A drop hopper 433 is provided at the bottom of each sorting screen connected to the mixing bin 3. The sealing structure between the various sorting screens blocks air ingress to a certain extent, while ensuring a good seal that allows only aggregate and water to pass through. Excess air is expelled only through the top of the sorting screen assembly 4, further improving the air discharge rate.

[0050] In the embodiment of the present disclosure, the specific structure is that the sorting screen assembly 4 includes a first sorting screen 41, a second sorting screen 42 and a third sorting screen 43 arranged in sequence from top to bottom; the first sorting screen 41 is provided with a first screen enclosure 411, a first screen 412 is provided on the bottom surface of the first screen enclosure 411, and a card slot 413 and a sealing ring 414 are provided on the bottom edge of the first screen enclosure 411; the structure of the second sorting screen 42 is the same as that of the first sorting screen 41; the third sorting screen 43 is provided with a third screen enclosure 431, a third screen 432 is provided on the bottom surface of the third screen enclosure 431, and a drop hopper 433 is connected under the third screen enclosure 431.

[0051] In the embodiment of the present disclosure, the mixing auxiliary assembly 1 is equipped with a water hose, one end of which is connected to a high-pressure nozzle 11 and the other end to a first water pump 12. High-pressure water jets agitate the aggregate 7, creating a water-sand mixture similar to a debris flow, which forms a film of water covering the sorting screen. The water displaces the air between the aggregate particles, effectively preventing air from entering the aggregate injection pipeline system and preventing the formation of air columns that could cause borehole blockage or even water-sand blowout accidents. More specifically, the second water pump 21 is equipped with a first valve 22. A flow meter 23 is flanged onto the water pipe 2. A jet nozzle 24 is installed at the water inlet end of the mixing chamber 3. A second valve 31 is installed between the mixing chamber 3 and the discharge hopper 433. The feed pipe 5 is connected to the borehole casing 6 via an orifice sealer 61. A second negative pressure gauge 62 is installed on the orifice sealer 61, which is equipped with a valve. The first negative pressure gauge 51 is also equipped with a valve.

[0052] The method for continuously pouring aggregate by drilling and grading according to the present invention is realized by using the device for continuously pouring aggregate by drilling and grading according to the present invention, and specifically comprises:

[0053] Step 1: Turn on the second water pump 21 and the first valve 22 to stabilize the water flow in the water pipe 2, and then transfer the aggregate 7 to the sorting screen assembly 4;

[0054] Step 2: Turn on the first water pump 12 and use the stirring auxiliary component 4 to jet-stir the aggregate 7 so that the aggregate 7 and water are fully mixed, forming a debris flow-like fluid that fully covers the sorting screen component 4 and prevents air from entering the mixing chamber 3;

[0055] Step 3: Open the second valve 31, and the mixture of aggregate 7 and water goes directly to the mixing chamber 3 through the hopper 433. Under the action of the jet nozzle 24, the aggregate 7 is mixed with a large amount of flowing water in the mixing chamber 3 and further mixed and stirred to form a water-sand mixed fluid with good fluidity; then it passes through the feed pipe 5 and the drilling casing 6 to reach the target formation.

[0056] More specific perfusion methods include:

[0057] 1) First check that the connection is sealed and there is no air leakage or water leakage, and the water tank 8 is filled with water;

[0058] 2) Close the second valve 31, open the first valve 22, start the second water pump 21, and test-fill the water pipe 2, mixing bin 3, material pipe 5, and orifice sealer 61 with water. When the flow meter 23 reading stabilizes and the filling time is greater than 30 minutes, the water filling is normal;

[0059] 3) Observe the water injection flow rate through the flow meter 23. After the flow rate stabilizes, observe the pointer changes of the first negative pressure gauge 51 and the second negative pressure gauge 62, and start the aggregate pouring;

[0060] 4) The aggregate 7 is transferred and stacked in the drop hopper 433;

[0061] 5) Turn on the first water pump 12 and use the stirring auxiliary component to jet-stir the aggregate 7 to fully mix the aggregate and water, forming a debris flow-like fluid that fully covers the dense sorting screen assembly 4 to prevent air from entering the mixing chamber 3;

[0062] 6) When the fluid to be mixed completely covers the sorting screen assembly 4, the second valve 31 is opened, and the aggregate and water mixture (mud and rock flow) passes through the sorting screen assembly 4 and the drop hopper 433 directly to the mixing bin 3. Under the action of the jet nozzle 24, the aggregate and a large amount of flowing water are mixed and further stirred in the mixing bin 3 to form a water-sand mixed fluid with good fluidity;

[0063] 7) The water-sand mixture passes through the feed pipe 5, the orifice sealer 61 and the drilling casing 6 to reach the target formation.

[0064] In step 3), the readings of the first negative pressure gauge 51 and the second negative pressure gauge 62 are greater than 0.04 MPa and remain stable; the first valve 22 is adjusted according to the reading of the first negative pressure gauge 51 to control the water injection flow rate. Specifically, when the negative pressure value is 0.04-0.06 MPa, the injection water volume is controlled at 50-60 m 3 / h; when the negative pressure value is 0.06~0.07MPa, the injection water volume is controlled at 60~80m 3 / h; when the negative pressure value is greater than 0.07MPa, the injection water volume is controlled at 80~100m 3 / h.

[0065] Furthermore, in step 4), the selection and control of aggregate particle size are as follows: in terms of particle size selection, the principle of pouring small materials first and then large materials is adopted; in terms of feeding speed control, the amount of aggregate poured per unit time is increased when the negative pressure is large, and the amount of aggregate poured per unit time is reduced when the negative pressure is small, that is, the principle of adding large and subtracting small. The specific operation is as follows: when the negative pressure value in the experimental pouring stage is 0.04-0.06 MPa, coarse sand with a particle size of 0.5-2.0 mm is selected as the aggregate, and a standard square hole stone screen of 4.75 mm is used for sorting and screening; when the negative pressure value in the channel connection stage is 0.06-0.07 MPa, a sand and gravel mixture with a particle size of 1-5 mm is selected as the aggregate, and a standard square hole stone screen of 9.5 mm is used for sorting and screening; when the negative pressure value in the channel blocking stage is greater than 0.07 MPa, stone with a particle size of 5.0-15.0 mm is selected as the aggregate, and a standard square hole stone screen of 16.0 mm is used for sorting and screening.

[0066] The sorting screen is a multi-level structure, each layer consists of a screen, a slot and a sealing ring. The aperture of the screen gradually increases from the upper layer to the lower layer. During pouring, the screen is replaced according to the aggregate particle size at different stages. It is very convenient and does not require shutdown for replacement, ensuring continuous graded pouring.

[0067] The material feeding speed during the pouring process: when the negative pressure value is 0.04-0.06MPa, the material feeding speed is controlled at 4-5t / h; when the negative pressure value is 0.06-0.07MPa, the material feeding speed is controlled at 6-8t / h; when the negative pressure value is greater than 0.07MPa, the material feeding speed is controlled at 10-15t / h.

[0068] Furthermore, in step 5), the water-to-solid ratio of the aggregate mixed with water to form a debris flow-like fluid is adjusted according to different stages of the pouring. The general principle is to pour the thin material first and then the thick material, that is, the thin-first-thick-later principle. The specific adjustment method is as follows: when the negative pressure value in the experimental pouring stage is 0.04-0.06 MPa, the water-to-solid ratio (mass ratio) is controlled at 12:1-10:1; when the negative pressure value in the channel connection stage is 0.06-0.07 MPa, the water-to-solid ratio (mass ratio) is controlled at 10:1-8:1; when the negative pressure value in the channel blocking stage is greater than 0.07 MPa, the water-to-solid ratio (mass ratio) is controlled at 8:1-6:1.

[0069] Example 1:

[0070] From mid-July to mid-October 2020, during the emergency rescue and treatment of a water inrush disaster at the 3315 coal mining face in a coal mine in Shandong, this type of graded continuous aggregate pouring device and method was used for the first time. Aggregates were successfully poured into the stratum water diversion channel continuously for a long time, creating a record of 10 consecutive days of aggregate pouring. Moreover, no foreign matter or air blockage occurred during the entire construction process. The goal of quickly intercepting and sealing the water diversion channel under dynamic water pressure differences of up to 8.5 MPa was achieved, meeting the mine's safe drainage requirements and providing a strong guarantee for the resumption of coal mine production safety as soon as possible.

[0071] The specific implementation steps are:

[0072] 1) First, connect and assemble the equipment, instruments, valves, hoppers, conveying pipes and other components, and check that the joints are sealed reliably and there is no air leakage;

[0073] 2) Start the second water pump 21 and test-fill the water pipe 2, mixing bin 3, material pipe 5 and orifice sealer 61 with water. When the flow meter 6 reading is stable and the filling time is greater than 30 minutes, the water filling is normal.

[0074] 3) Observe the water injection flow rate through the flow meter 23. After the flow rate stabilizes, open the valve and observe the changes in the pointers of the first negative pressure gauge 51 and the second negative pressure gauge 62. After the readings of the first negative pressure gauge 51 and the second negative pressure gauge 62 are greater than 0.04 MPa and remain stable, start the aggregate pouring;

[0075] 4) Use a forklift to transfer the aggregate 7 from the aggregate storage yard and stack it in the drop hopper 433;

[0076] The selection and control of aggregate particle size are:

[0077] When the negative pressure value in the experimental pouring stage is 0.04MPa, the aggregate is selected as coarse sand with a particle size of 2.0mm, and a standard square-hole gravel sieve of 4.75mm is used for sorting and screening; when the negative pressure value in the channel connection stage is 0.06MPa, the aggregate is selected as a sand and gravel mixture with a particle size of 1-5mm, and a standard square-hole gravel sieve of 9.5mm is used for sorting and screening; when the negative pressure value in the channel blocking stage is 0.07MPa, the aggregate is selected as a gravel mixture with a particle size of 5.0-15.0mm, and a standard square-hole gravel sieve of 16.0mm is used for sorting and screening.

[0078] The material feeding speed during the pouring process: when the negative pressure value is 0.04~0.06MPa, the material feeding speed is controlled at 4t / h; when the negative pressure value is 0.06~0.07MPa, the material feeding speed is controlled at 8t / h; when the negative pressure value is 0.07MPa, the material feeding speed is controlled at 15t / h.

[0079] 5) Turn on the first water pump 12 and use the stirring auxiliary component to jet-stir the aggregate 7, so that the aggregate and water are mixed to form a debris flow-like fluid that completely covers the drop hopper 433, preventing air from entering the mixing chamber 3;

[0080] The ratio of aggregate to water is adjusted according to different stages of pouring. The adjustment method is as follows:

[0081] When the negative pressure value in the experimental perfusion stage is 0.04MPa, the water-solid ratio (mass ratio) is controlled at 12:1; when the negative pressure value in the channel connection stage is 0.06-0.07MPa, the water-solid ratio (mass ratio) is controlled at 8:1; when the negative pressure value in the channel blocking stage is greater than 0.07MPa, the water-solid ratio (mass ratio) is controlled at 6:1.

[0082] 6) When the fluid to be mixed completely covers the hopper 433, the second valve 31 is opened, and the aggregate and water mixture (mud and rock flow) passes through the sorting screen assembly 4 and the hopper 433 directly to the mixing bin 3. Under the action of the jet nozzle 24, the aggregate and a large amount of flowing water are mixed and further stirred in the mixing bin 3 to form a water-sand mixed fluid with good fluidity;

[0083] 7) The water-sand mixture passes through the feed pipe 5, the orifice sealer 61 and the drilling casing 6 to reach the target formation.

[0084] The function of valve 3 is to adjust the injection water volume, control the water-aggregate ratio and the injection volume per unit time. The specific method is: determine the injection water volume according to the negative pressure change (injectability) displayed by the negative pressure gauge; when the negative pressure value is 0.04~0.06MPa, the injection water volume is controlled at 60m 3 / h; when the negative pressure value is 0.06~0.07MPa, the injection water volume is controlled at 80m 3 / h; when the negative pressure value is greater than 0.07MPa, the injection water volume is controlled at 100m 3 / h;

[0085] The process of forming negative pressure in the structure of the present invention is as follows: under the action of gravity, water flows downward rapidly in the borehole, which is similar to the suction effect formed by the movement of a piston, forming negative pressure at the borehole mouth and transmitting it to the material delivery pipeline, generating a strong suction effect, so that the aggregate pouring work is completed smoothly.

[0086] The function of the sorting screen 11 of the present invention is to control the particle size and feeding speed of the poured aggregate, and at the same time prevent foreign matter from entering the mixing bin and blocking the feed pipeline or drill hole;

[0087] The present invention selects sorting screens of different mesh sizes according to the engineering requirements of different time periods and the injectability of the channel (monitored by the first negative pressure gauge 51), and controls the aggregate particle size and aggregate injection speed in real time, which is a necessary condition to ensure the continuity, reliability and effectiveness of the aggregate injection process.

[0088] The present invention controls the aggregate pouring speed in real time by adjusting the fluid viscosity in combination with the mesh size of the sorting screen and the reading of the negative pressure gauge, and simultaneously uses a high-pressure water gun to jet and stir the material, thereby greatly reducing the intensity of manual labor and eliminating the occurrence of (abnormal) accidental blockage of the feed pipeline or drill hole during the pouring of aggregate due to factors such as too fast or too slow manual feeding (air intake).

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It should be pointed out that any improvements and modifications made by ordinary technicians in this technical field without departing from the principle of the present invention should be regarded as within the scope of protection of the present invention.

Claims

1. A drilling and grading continuous aggregate pouring device, characterized in that: A water delivery pipe (2), a mixing chamber (3) and a material delivery pipe (5) are provided which are connected in sequence; A sorting screen assembly (4) is connected to the mixing bin (3); the sorting screen assembly (4) is filled with aggregate (7); A stirring auxiliary component (1) is also provided. The stirring auxiliary component (1) is used to stir and impact the aggregate (7) contained in the upper portion through a high-pressure water flow, so that the aggregate passes through the sorting screen component (4) and enters the mixing bin (3). The aggregate in the mixing bin (3) is then impact-transported along the feed pipe (5) by the water flow transported by the water pipe (2). The high-pressure water flow of the stirring auxiliary component (1) stirs and impacts the aggregate to form a water-sand mixed fluid similar to a debris flow, forming a fully covered water film on the sorting screen component (4), and the water replaces the air between the aggregate particles, preventing air from entering the aggregate perfusion pipeline system; The sorting screen assembly (4) comprises a plurality of sorting screens stacked in sequence from top to bottom, and the apertures of the sieve holes of the plurality of sorting screens increase in sequence from top to bottom; a first negative pressure gauge (51) is provided on the feed pipe (5) for real-time monitoring of the negative pressure value in the feed pipe (5), and adjusting the water injection amount of the water pipe (2) and the mesh size of the sorting screen according to the negative pressure value.

2. The drilling and grading continuous aggregate pouring device according to claim 1 is characterized in that: The mixing chamber (3) is a tubular cavity, and the inner diameter of the mixing chamber (3) is larger than the inner diameter of the water delivery pipe (2) and / or the inner diameter of the material delivery pipe (5).

3. The drilling and grading continuous aggregate pouring device according to claim 1 or 2, characterized in that: A jet nozzle (24) is connected and arranged at the connection end between the water delivery pipe (2) and the mixing chamber (3).

4. The drilling and grading continuous aggregate pouring device according to claim 1 or 2, characterized in that: The sorting screen assembly (4) comprises a plurality of sorting screens stacked in sequence from top to bottom; The apertures of the sieve holes of the plurality of sorting sieves increase in sequence.

5. The drilling and grading continuous aggregate pouring device according to claim 4 is characterized in that: Adjacent sorting screens are sealed and stacked together via slots (413) and sealing rings (414); A drop hopper (433) is provided at the bottom of the sorting screen connected to the mixing bin (3).

6. The drilling and grading continuous aggregate pouring device according to claim 1 or 2, characterized in that: The sorting screen assembly (4) comprises a first sorting screen (41), a second sorting screen (42) and a third sorting screen (43) which are arranged in sequence from top to bottom; The first sorting screen (41) is provided with a first screen enclosure (411), a first screen mesh (412) is provided on the bottom surface of the first screen enclosure (411), and a clamping groove (413) and a sealing ring (414) are provided on the bottom edge of the first screen enclosure (411); the structure of the second sorting screen (42) is the same as that of the first sorting screen (41); The third sorting screen (43) is provided with a third screen enclosure (431), a third screen mesh (432) is provided on the bottom surface of the third screen enclosure (431), and a drop hopper (433) is provided below the third screen enclosure (431).

7. The drilling and grading continuous aggregate pouring device according to claim 1 or 2, characterized in that: The stirring auxiliary component (1) is provided with a water delivery hose, one end of the water delivery hose is connected to a high-pressure nozzle (11), and the other end is connected to a first water pump (12).

8. A method for continuous pouring of aggregates by drilling and grading, characterized in that: The method is realized by using the drilling and grading continuous aggregate pouring device according to any one of claims 1 to 7, specifically comprising: Step 1: Turn on the second water pump (21) and the first valve (22) to stabilize the water flow in the water pipe (2), and then transfer the aggregate (7) to be stacked on the sorting screen assembly (4); Step 2: Turn on the first water pump (12) and use the stirring auxiliary component (1) to jet-stir the aggregate (7) to fully mix the aggregate (7) and water, forming a debris flow-like fluid that fully covers the sorting screen component (4) to prevent air from entering the mixing chamber (3); Step 3: Open the second valve (31), and the mixture of aggregate (7) and water directly reaches the mixing chamber (3) through the hopper (433). Under the action of the jet nozzle (24), the aggregate (7) and a large amount of flowing water are mixed and further mixed in the mixing chamber (3) to form a water-sand mixed fluid with good fluidity; and then the mixed fluid reaches the target formation through the feed pipe (5) and the drilling casing (6); When the negative pressure value in the feed pipe (5) is 0.04-0.06 MPa, the water injection volume of the water pipe (2) is controlled at 50-60 m 3 / h; When the negative pressure value in the feed pipe (5) is 0.06-0.07 MPa, the water injection volume of the water pipe (2) is controlled at 60-80 m 3 / h; When the negative pressure value in the feed pipe (5) is greater than 0.07 MPa, the water injection volume of the water pipe (2) is controlled at 80 to 100 m 3 / h; During the experimental pouring stage, when the negative pressure value of the feed pipe (5) is 0.04-0.06 MPa, the aggregate is selected as coarse sand with a particle size of 0.5-2.0 mm, and a standard square hole stone sieve of 4.75 mm is used for sorting and screening; During the channel connection stage, when the negative pressure value of the feed pipe (5) is 0.06-0.07 MPa, the aggregate is selected as a sand and gravel mixture with a particle size of 1-5 mm, and a 9.5 mm standard square hole stone sieve is used for sorting and screening; During the channel blocking stage, when the negative pressure value of the feed pipe (5) is greater than 0.07 MPa, the aggregate is selected to be stones with a particle size of 5.0 to 15.0 mm, and a 16.0 mm standard square hole stone sieve is used for sorting and screening; The material discharge speed during the pouring process is: when the negative pressure value of the material delivery pipe (5) is 0.04-0.06MPa, the material discharge speed is controlled at 4-5t / h; when the negative pressure value of the material delivery pipe (5) is 0.06-0.07MPa, the material discharge speed is controlled at 6-8t / h; when the negative pressure value of the material delivery pipe (5) is greater than 0.07MPa, the material discharge speed is controlled at 10-15t / h; During the experimental pouring stage, when the negative pressure value of the feed pipe (5) is 0.04-0.06 MPa, the water-solid ratio in the mixing chamber (3) is controlled at 12:1-10:1; During the channel connection stage, when the negative pressure value of the feed pipe (5) is 0.06-0.07 MPa, the water-solid ratio in the mixing bin (3) is controlled at 10:1-8:1; During the channel blocking stage, when the negative pressure value of the feed pipe (5) is greater than 0.07 MPa, the water-solid ratio in the mixing bin (3) is controlled within the range of 8:1 to 6:1.

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