Rapid separation and sediment control method for deep hole under pebble covering layer

Abstract

The invention relates to the field of pile foundation construction methods, and particularly discloses a method for quickly separating sediment in a deep hole under a pebble covering layer and controlling sediment, which comprises the following steps: S1, digging a sedimentation basin; s2, mounting a vibrating screen; s3, a slurry pump is installed; s4, lowering a guide pipe; s5, adjusting pipe lowering; s6, performing circulating filtration; and S7, adjusting and optimizing, specifically, reverse gushing mud is rapidly screened through a vibrating screen, then grouting is conducted from a mud pool to a guide pipe of a conical structure through a plurality of mud returning pipes, so that large-flow mud flow can be formed at the lower end of the guide pipe, the mud flow reversely gushes upwards from a gap in the side portion of the guide pipe, sediment at the bottom of a hole is brought out, and therefore the mud flow can be formed. The adjusting pipe injects adjusting slurry into the gap, the adjusting slurry can further enhance upward scouring force in the long and narrow space so as to continue to lift large-particle sediments rising to the middle section, the sediments are prevented from falling back midway, and the adjusting pipe can also switch to inject clear water to lower the concentration of back-surging slurry. The hole wall of the pebble bed is protected from being scattered, and the hole wall quality is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of pile foundation construction methods, and in particular relates to a method for rapid separation of deep hole mud and sand and sediment control under a pebble covering layer. Background Art

[0002] When the railway subgrade construction was carried out in northern Guangxi, its geology was characterized by the development of karst caves, widespread distribution of pebble layers, and interlaced dissolution fissures. The thickness of the pebble layer was usually 10-25 meters underground, and even 30-55 meters deep in some riverbed areas. The drilling depth of the pile foundation hole must exceed 20 meters from the bottom of the pebble layer to achieve the expected strength. The final total length of the hole was greater than 40 meters. In the field of railway subgrade construction, pile foundation holes with a depth of more than 40 meters are usually identified as deep holes. During deep hole construction, a large amount of mud and sand will fall into the bottom of the hole during the drilling process. At the same time, the development of karst leads to poor stability of the hole wall, a lot of sediment and large particles, and great difficulty in control.

[0003] Due to the excessive depth of the pile hole and the large particles of sediment, when using traditional construction methods to clear the sediment, the sediment will fall back to the bottom of the hole during the rising process. If the sediment is cleared by increasing the flow rate, the hole wall will be impacted too much and become unstable, which will further thicken the sediment layer at the bottom, seriously affecting the quality of the pile. This not only increases economic costs, such as rework costs caused by quality problems; it also delays the construction period and affects the progress of the entire construction; it also brings safety hazards. The unstable pile foundation may cause structural safety accidents during subsequent use.

[0004] A method for cleaning the bottom of a deep hole pile is disclosed in a patent document with application number "CN2018103862677", which includes the following steps: A. First, obtain a cleaning bucket with the following structure, wherein a sleeve mechanism is coaxially arranged in the middle of the cleaning bucket; the bottom of the cleaning bucket is a filter screen through which mud can flow, and the aperture of the filter screen is smaller than the minimum diameter of the debris to be cleaned; the cleaning bucket is also provided with a lifting lug for connecting a lifting rope; B. When in use, pass a grouting conduit through the sleeve mechanism, and extend the grouting conduit vertically into the bottom of the hole; connect the lifting lug of the cleaning bucket to the lifting rope of the lifting device, and lower it to the bottom of the hole; use the grouting conduit to pass mud into the bottom of the pile hole, so that the mud drives the debris at the bottom of the hole to rise above the cleaning bucket, and then sinks into the cleaning bucket, and then uses the lifting rope to lift the cleaning bucket for cleaning. The reference document also discloses adjacent sedimentation tanks and mud pools, as well as a mud pump disposed in the mud pool, the outlet of the mud pump being connected to a grouting conduit for vertically extending into the bottom of the hole through a pipeline. Although the reference document can perform a certain slag removal effect on the bottom of the pile foundation hole through a slag removal bucket, and also sets up a sedimentation tank and a mud pool, which can play a role in filtering the circulating mud, the gap between the slag removal bucket and the hole wall is too small to allow larger particles of pebble sediment to pass through, and it is still not suitable for structures under thick pebble covering layers, and the residue can still leak from the gap outside the slag removal bucket to the bottom of the hole, resulting in incomplete slag removal.

[0005] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] The purpose of the present invention is to provide a method for rapid separation of mud and sand and control of sediment in deep holes under a pebble overburden layer, so as to overcome the technical defects of traditional construction methods that it is difficult to remove a large amount of large-particle sediment at the bottom of the hole when deep hole construction is carried out under a thick pebble overburden layer and in areas with strongly developed karst, and it is difficult to control the instability of the hole wall during the slag removal, which seriously affects the quality of pile formation.

[0007] To achieve the above object, the present invention provides a method for rapid separation of sediment and sediment control in deep holes under a pebble cover layer, comprising the following steps: S1. Digging a sedimentation tank: digging a sedimentation tank, which is divided into a mud tank and a silt tank, and installing a return pump in the mud tank and connecting it with a return pipe; S2. Install vibrating screen: Install vibrating screen above the sedimentation tank, with the coarse material outlet and fine material outlet of the vibrating screen corresponding to the sediment tank and mud tank respectively; S3. Installing a slurry pump: Install a slurry pump at the opening of the pile hole and connect it to the feed port of the vibrating screen through a delivery hose; S4, lowering the conduit: insert the conduit into the pile hole, the upper end of the conduit is connected to the return grouting pipe, and the diameter of the lower end of the conduit gradually decreases; S5, lower regulating pipe: the upper end of the regulating pipe is connected to the regulating tank through a regulating pump. The regulating tank is filled with mud or clean water. The lower end of the regulating pipe extends into the gap between the guide tube and the pile hole. S6, circulation filtration: add mud to the mud pool, turn on the return slurry pump to pump the mud into the conduit, the mud is accelerated to the bottom of the pile hole through the conduit and the sediment is flushed and mixed with the mud in the pile hole and then flows back to the hole mouth, turn on the slurry pump to pump the backflow mud to the vibrating screen for screening, the large sediment enters the sediment pool, the fine sediment enters the mud pool through the screen, and the mud in the mud pool is continuously pumped into the conduit by the return slurry pump to form a cycle; S7. Regulation optimization: Inject mud through the regulating pipe. When the sediment in the backflow mud is reduced, inject clean water into the regulating pipe or close the regulating pipe, and reduce the working power of the backflow pump.

[0008] Preferably, in the above technical solution, in step S3, a buffer groove is dug on the outer periphery of the hole mouth of the pile hole, and the grouting pump is arranged in the buffer groove.

[0009] Preferably, in the above technical solution, the buffer tank includes an annular portion and a lower pump area, the annular portion is arranged around the outer periphery of the orifice of the pile hole, the lower pump area is located on the outside of the annular portion, the bottom of the lower pump area is lower than the bottom of the annular portion, and the grouting pump is arranged in the lower pump area.

[0010] Preferably, in the above technical solution, the number of the regulating pipes is more than two, and in step S5, the number of the regulating tanks is more than two, one of which is connected to the return slurry pipe, and the regulating pump is respectively arranged in each of the regulating tanks, and the regulating pump is connected to the upper end of the regulating pipe through a branch pipe and a branch valve.

[0011] Preferably, in the above technical solution, in step S4, it also includes an automatic sensor, which includes a fixed block and a movable block, the fixed block is fixedly connected to the outer wall of the catheter, the movable block is slidably connected to the fixed block, and a pressure sensor is installed between the fixed block and the movable block.

[0012] Preferably, in the above technical solution, in step S4, the diameter of the conduit is d, and the diameter of the conduit gradually decreases to d / 2 at a distance of 2 meters from the lower end of the conduit, thereby forming an inverted cone.

[0013] Preferably, in the above technical solution, it is characterized in that a branch pipe is provided on the inverted cone surface, and the outlet of the branch pipe extends to the lower side of the conduit.

[0014] Preferably, in the above technical solution, in step S6, the guide tube is rotated so that the outlet of the branch pipe is rotated and sprayed toward the bottom of the pile hole.

[0015] Preferably, in the above technical solution, the diameter of the branch pipe at the outlet gradually decreases.

[0016] Preferably, in the above technical solution, the mesh size of the vibrating screen is 5 mm, the vibration frequency of the vibrating screen is 45-50 Hz, and the amplitude is 0-2 mm.

[0017] Compared with the existing technology, the present invention has the following beneficial effects: 1. The method for rapid separation of mud and sand and sediment control in deep holes under a pebble overburden layer of the present invention can quickly screen the backwash mud through a vibrating screen, and then inject grout from the mud pool into a conical conduit through a plurality of backwash pipes, so as to form a large-flow mud flow at the lower end of the conduit, and the high-kinetic energy mud backwashes upward from the gap on the side of the conduit to bring out the sediment at the bottom of the hole, and a regulating pipe is added in the gap, through which regulating mud can be injected into the gap, and the regulating mud can further enhance the kinetic energy of the mud backwash in the narrow space to continue to lift the large-particle sediment rising to the middle section, and prevent the sediment from falling back halfway, and the regulating pipe can also switch to inject clean water to timely adjust the backwash mud concentration, and at the same time reduce the working power of the backwash pump to protect the hole wall of the pebble layer from being dispersed, thereby ensuring the quality of the hole wall.

[0018] 2. An annular buffer groove and a lower pump area are dug around the hole mouth of the pile foundation, which can be used to buffer and store the mud after the backflow, and can push the sediment particles into the buffer groove and settle in the lower pump area, thereby further preventing the sediment after the backflow from falling back.

[0019] 3. There are more than two regulating tanks, and each regulating tank is filled with clean water or mud. Each regulating tank is connected to the regulating pipe through a branch pipeline and a branch valve. The density of the backflow mud can be quickly adjusted by quickly switching the valve switch. The regulating tank filled with mud can be connected to a return slurry pipe so that the mud can be recycled and cost-saving.

[0020] 4. A branch pipe is provided on the side of the inverted cone surface at the lower end of the conduit. During grouting, the slurry can be accelerated to spray out from the branch pipe to the lower side of the conduit, and the conduit can drive the branch pipe to rotate synchronously during grouting, so as to flush the sediment in the corner of the bottom of the pile hole, making the slag cleaning effect more thorough.

[0021] 5. An automatic sensor is installed on the outer wall of the conduit, which can assist in judging the sediment content in the backflow mud by sensing the shear force during the mud flow process. When there is a lot of sediment, the shear force value fluctuates greatly, and the flow rate of the return slurry pipe or the flow rate of the mud injected into the regulating pipe can be increased; when there is less sediment, the shear force value fluctuates little and tends to be stable, and the regulating pump can be turned off or the regulating pipe can be switched to inject clean water, and the flow rate of the return slurry pipe can be reduced to reduce the scouring force on the wall of the pile hole and prevent the hole wall from collapsing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flow chart of a method for rapid separation of sediment and sediment control in a deep hole under a pebble covering layer.

[0023] Figure 2 It is a schematic diagram of the installation of the vibrating screen and the sedimentation tank in the present invention.

[0024] Figure 3 It is a structural schematic diagram of the buffer tank in the present invention.

[0025] Figure 4 This is a front view of the catheter.

[0026] Figure 5 is a top view of the catheter.

[0027] Description of main reference numerals: 100-support table, 120-support plate; 200-catheter, 210-inverted cone; 300-ring buckle; 400-branch pipe; 500-adjusting tube; 700-vibrating screen, 710-mud pool, 720-sediment pool, 730-fixed frame; 800 - buffer tank, 810 - annular portion, 820 - lower pump area. DETAILED DESCRIPTION

[0028] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection 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. The following is an explanation of the embodiments of the present invention based on its overall structure.

[0032] like Figures 1 to 5 As shown, this embodiment discloses a method for rapid separation of sediment and sediment control in deep holes under a pebble cover layer, comprising the following steps: S1. Digging a sedimentation tank: digging a sedimentation tank around the pile hole area, the sedimentation tank is divided into two independent areas, a mud tank 710 and a silt tank 720, and several slurry return pumps are installed in the mud tank 710 and connected with slurry return pipes; S2. Install the vibrating screen: build a fixed frame 730 above the sedimentation tank, install the vibrating screen 700 on the fixed frame 730, align the coarse material outlet of the vibrating screen 700 with the mouth of the sediment tank 720, and align the fine material outlet of the vibrating screen 700 with the mouth of the mud tank 710. The mesh size of the vibrating screen 700 is 5 mm, the vibration frequency is adjusted to 45-50 Hz, and the amplitude is 0-2 mm. S3, installing a slurry pump: dig a buffer groove 800 on the periphery of the pile hole, the buffer groove 800 includes an annular portion 810 and a lower pump area 820, the annular portion 810 is arranged around the hole of the pile hole, the lower pump area 820 is located outside the annular portion 810, the bottom of the lower pump area 820 is lower than the bottom of the annular portion 810, and a slurry pump is installed in the lower pump area 820, and the slurry pump is connected to the feed port of the vibrating screen 700 through a delivery hose; S4, lowering the conduit: a support platform 100 is built at the mouth of the pile hole, a mounting hole is opened on the support platform 100, a conduit 200 is installed in the mounting hole, the diameter of the conduit 200 is d, the top of the conduit 200 is connected to the return grouting pipe, the lower end of the conduit 200 extends to the bottom of the pile hole and an automatic sensor is installed on its side wall, the diameter of the conduit 200 gradually decreases to d / 2 at a distance of 2 meters from the lower end of the conduit 200, thereby forming an inverted cone 210, a branch pipe 400 is welded at the inverted cone 210, the outlet of the branch pipe 400 extends to the side and lower side of the conduit 200, and the diameter of the outlet of the branch pipe 400 gradually decreases; S5, lower regulating pipe: the top of the regulating pipe 500 is connected to the regulating tank through a regulating pump. There are more than two regulating tanks and they can move independently. Mud or clean water is respectively contained in each regulating tank. The regulating tank filled with mud is connected to a return slurry pipe. The regulating pump is respectively installed in each regulating tank. Each regulating pump is connected to the upper end of the regulating pipe 500 through a branch pipe and a branch valve. The bottom end of the regulating pipe 500 extends into the gap between the outer wall of the guide tube 200 and the inner wall of the pile hole. S6, circulation filtration: first add a part of mud to the mud pool 710, turn on the return slurry pump, the mud is accelerated by the guide tube 200 and then sprayed into the pile hole, and at the same time, the guide tube 200 is rotated to accelerate the mud to spray out from the lower end of the guide tube 200 and the branch pipe 400, flush the sediment at the bottom of the pile hole and mix it with the mud, and then flow back into the buffer tank 800, turn on the slurry pump to send the backflowing mud to the entrance of the vibrating screen 700 for screening, large particles (diameter greater than 5 mm) pebbles and some coarse sand are intercepted by the screen and flow from the coarse material outlet into the sediment pool 720, and fine particles (diameter less than or equal to 5 mm) of sediment flow into the mud pool 710 through the screen, and the mud in the mud pool 710 is continuously pumped into the guide tube 200 by the return slurry pump to form a cycle; S7. Regulation optimization: open the regulating pump in the regulating tank filled with mud to inject mud into the regulating pipe 500, and then the shear force in the mud flow process can be sensed by the automatic sensor. When the measured value and fluctuation of the shear force are large, it means that there is still sediment in the hole. You can increase the flow rate of the return slurry pipe or increase the flow rate of the mud injected into the regulating pipe 500; when the measured value and fluctuation of the shear force are small, it means that the sediment in the hole has been basically cleared. You can reduce the working power of the return slurry pump and the flow rate of the return slurry pipe. At the same time, close the regulating pipe 500. When the mud density at the feed port of the vibrating screen 700 is large, you can switch the regulating pipe 500 to inject clean water to reduce the scouring force of the pile hole wall and prevent collapse. At the same time, you can also lower the concentration of the backwash mud to improve the screening effect.

[0033] In more detail, the automatic sensor in step S4 includes a fixed block and a movable block, the fixed block is fixedly connected to the outer wall of the catheter 200, the movable block is slidably connected to the fixed block and can slide along the axial direction of the catheter 200, and a pressure sensor is installed between the movable block and the fixed block. When the mud in the gap between the catheter 200 and the pile hole surges back, it can collide with the movable block, so that shear force detection can be performed through the pressure sensor. When the movable block is hit by larger sediment particles, the real-time pressure measurement value of the pressure sensor has a large and irregular fluctuation amplitude. When the large particles of sediment are removed, the real-time pressure measurement value of the pressure sensor has a smaller fluctuation amplitude and tends to be stable.

[0034] In more detail, the support platform 100 is a cubic frame structure, and a support plate 120 is arranged on the top of the support platform 100, wherein the two support plates 120 near the middle can be opened opposite to each other, and semicircular holes are respectively opened at the edges of the two openable and closable support plates 120, and when the two semicircular holes are closed, a mounting hole can be formed, and an outwardly protruding ring buckle 300 is arranged on the outer wall of the upper end of the catheter 200, and the ring buckle 300 can be stuck above the mounting hole, so as to position and install the catheter 200 to limit the downward movement of the catheter 200 along its own axial direction, and enable the catheter 200 to rotate around the axis of the catheter 200 itself.

[0035] In summary, the method for rapid separation of mud and sand and sediment control in deep holes under the pebble overburden layer in this embodiment can quickly screen the backflowing mud through the vibrating screen 700, and then inject grout from the mud pool 710 into the conical structured catheter 200 through multiple return slurry pipes, so as to form a large flow of mud at the lower end of the catheter 200. The high-kinetic energy mud flow flows upward from the gap on the side of the catheter 200 to bring out the sediment at the bottom of the hole, and a regulating pipe 500 is added in the gap, through which regulating mud can be injected into the gap. The regulating mud can further enhance the kinetic energy of the backflow of the mud in the narrow space to continue to lift the large-particle sediment rising to the middle section, and prevent the sediment from falling back midway. The regulating pipe 500 can also switch to injecting clean water to adjust the concentration of the backflowing mud in time, and at the same time reduce the working power of the return slurry pump to protect the hole wall of the pebble layer from being dispersed, thereby ensuring the quality of the hole wall.

[0036] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of explanation and illustration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although an embodiment of the present invention has been shown and described, this specific embodiment is only an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various selections and changes to the embodiments without creative contribution as needed without departing from the principles and purpose of the present invention after reading this specification, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for rapid separation of sediment and sediment control in deep holes under pebble cover, characterized in that: The following steps are involved: S1. Digging a sedimentation tank: digging a sedimentation tank, which is divided into a mud tank and a silt tank, and installing a return pump in the mud tank and connecting it with a return pipe; S2. Install vibrating screen: Install vibrating screen above the sedimentation tank, with the coarse material outlet and fine material outlet of the vibrating screen corresponding to the sediment tank and mud tank respectively; S3. Installing a slurry pump: Install a slurry pump at the opening of the pile hole and connect it to the feed port of the vibrating screen through a delivery hose; S4, lowering the conduit: insert the conduit into the pile hole, the upper end of the conduit is connected to the return grouting pipe, and the diameter of the lower end of the conduit gradually decreases; S5, lower regulating pipe: the upper end of the regulating pipe is connected to the regulating tank through a regulating pump. The regulating tank is filled with mud or clean water. The lower end of the regulating pipe extends into the gap between the guide tube and the pile hole. S6, circulation filtration: add mud to the mud pool, turn on the return slurry pump to pump the mud into the conduit, the mud is accelerated to the bottom of the pile hole through the conduit and the sediment is flushed and mixed with the mud in the pile hole and then flows back to the hole mouth, turn on the slurry pump to pump the backflow mud to the vibrating screen for screening, the large sediment enters the sediment pool, the fine sediment enters the mud pool through the screen, and the mud in the mud pool is continuously pumped into the conduit by the return slurry pump to form a cycle; S7. Regulation optimization: Inject mud through the regulating pipe. When the sediment in the backflow mud is reduced, inject clean water into the regulating pipe or close the regulating pipe, and reduce the working power of the backflow pump.

2. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 1 is characterized in that: In step S3, a buffer groove is dug on the outer periphery of the hole opening of the pile hole, and the grouting pump is arranged in the buffer groove.

3. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 2, characterized in that: The buffer tank includes an annular portion and a lower pump area. The annular portion is arranged around the outer periphery of the orifice of the pile hole, the lower pump area is located outside the annular portion, the bottom of the lower pump area is lower than the bottom of the annular portion, and the grouting pump is arranged in the lower pump area.

4. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 1, characterized in that: In step S5, the number of the regulating tanks is more than two, one of which is connected to the return slurry pipe, and the regulating pump is respectively arranged in each regulating tank, and the regulating pump is connected to the upper end of the regulating pipe through a branch pipe and a branch valve.

5. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 1, characterized in that: In step S4, an automatic sensor is also included, which includes a fixed block and a movable block. The fixed block is fixedly connected to the outer wall of the catheter, and the movable block is slidably connected to the fixed block. A pressure sensor is installed between the fixed block and the movable block.

6. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 1, characterized in that: In step S4, the diameter of the conduit is d, and the diameter of the conduit gradually decreases to d / 2 at a distance of 2 meters from the lower end of the conduit, thereby forming an inverted cone.

7. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 6, characterized in that: A branch pipe is arranged on the inverted cone surface, and an outlet of the branch pipe extends to the lower side of the conduit.

8. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 7, characterized in that: In step S6, the guide tube is rotated to cause the outlet of the branch pipe to rotate and spray grout toward the bottom of the pile hole.

9. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 8, characterized in that: The diameter of the branch pipe at the outlet gradually decreases.

10. The method for rapid separation of sediment and sediment control in deep holes under pebble cover according to claim 1, characterized in that: The mesh size of the vibrating screen is 5 mm, the vibration frequency of the vibrating screen is 45-50 Hz, and the amplitude is 0-2 mm.

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