Method for rapid sediment separation and sediment control in deep holes under pebble cover

Abstract

The present invention relates to the field of pile foundation construction methods, and specifically discloses a method for rapid separation of deep-hole sediment and control of sedimentation under pebble-covered layers, including the following steps: S1, excavating a sedimentation pool; S2, installing a vibrating screen; S3, installing a slurry pumping pump; S4, lowering a conduit; S5, lowering an adjustment pipe; S6, circulating and filtering; S7, adjusting and optimizing. The vibrating screen is used to rapidly screen the gushing slurry, and then the slurry is injected into the conduit with a conical structure from the slurry pool through multiple slurry return pipes, so as to form a large-flow slurry flow at the lower end of the conduit. The slurry flow gushes upward from the gaps on the side of the conduit, bringing out the sediment at the bottom of the hole. The adjustment pipe injects adjustment slurry into the gaps. The adjustment slurry can further enhance the upward scouring force in the narrow space to continue to lift the large-particle sediment rising to the middle section, preventing the sediment from falling back midway. Moreover, the adjustment pipe can also switch to injecting clear water to lower the concentration of the gushing slurry, protecting the hole wall of the pebble layer from being washed away and ensuring the quality of the hole wall.

Description

Technical Field

[0001] The present invention belongs to the field of pile foundation construction methods, and particularly relates to a method for rapid separation of deep-hole sediment and control of sedimentation under pebble-covered layers. Background Art

[0002] When constructing railway subgrades in the northern part of Guangxi, the geology is characterized by developed karst caves, extensive distribution of pebble layers, and interlaced dissolution fissures. The thickness of the pebble layer is usually in the area 10 - 25 meters underground, and in some local riverbed areas, it is even 30 - 55 meters deep. The drilling depth of the pile foundation hole needs to exceed the bottom of the pebble layer by more than 20 meters to achieve the expected strength, and the total length of the finally formed hole is greater than 40 meters. In the field of railway subgrade construction, pile foundation holes with a depth exceeding 40 meters are usually recognized as deep holes. During the construction of deep holes, a large amount of sediment will fall to the bottom of the hole during the hole-forming process. At the same time, the development of karst causes poor stability of the hole wall, with a large amount of sediment and large particles, making it difficult to control.

[0003] Due to the excessive depth of the pile hole and the large particles of the sediment, when using traditional construction methods for sediment cleaning, the sediment will fall back to the bottom of the hole during the rising process. If measures such as increasing the flow rate are used for sediment cleaning, it will cause the problem of excessive impact on the hole wall and instability, resulting in further thickening of the bottom sediment layer, seriously affecting the quality of the formed pile. This not only increases the economic cost, such as the rework cost caused by quality problems, but also delays the construction period and affects the progress of the entire construction. Moreover, it brings potential safety hazards, and unstable pile foundations may cause structural safety accidents during subsequent use.

[0004] A method for cleaning sediment at the bottom of a deep-hole pile is disclosed in the patent document with the application number "CN2018103862677", which includes the following steps: A. First, obtain a sediment cleaning bucket with the following structure. A casing mechanism is coaxially arranged in the middle of the sediment cleaning bucket. The bottom of the sediment 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 slag to be cleaned. A lifting lug for connecting a lifting rope is also arranged on the sediment cleaning bucket. B. During use, pass a grouting conduit through the casing mechanism and vertically extend the grouting conduit to the bottom of the hole. Connect the lifting lug of the sediment cleaning bucket to the lifting rope of the lifting device and lower it to the bottom of the hole. Inject mud into the bottom of the pile hole through the grouting conduit, so that the mud drives the crushed slag at the bottom of the hole to rise above the sediment cleaning bucket and then sink into the sediment cleaning bucket. Then, lift the sediment cleaning bucket with the lifting rope and clean the slag. The comparative document also discloses an adjacent sedimentation tank and a mud tank, as well as a mud pump arranged in the mud tank. The outlet of the mud pump is connected with a grouting conduit for vertically extending into the bottom of the hole. Although the comparative document can clean the bottom of the pile foundation hole to a certain extent through the sediment cleaning bucket and also has a sedimentation tank and a mud tank, which can play a role in filtering and circulating the mud, the gap between the sediment cleaning bucket and the hole wall is too small to allow larger pebble sediment to pass through. It is still not applicable to the structure under a thick pebble covering layer, and the residue can still leak to the bottom of the hole through the gap outside the sediment cleaning bucket, resulting in incomplete sediment cleaning.

[0005] The disclosure of the above background technical content is only for assisting in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application. Without clear evidence indicating that the above content was publicly available on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for rapid separation of sediment and control of sediment deposition in deep holes under a pebble covering layer, so as to overcome the technical defects that it is difficult to remove a large amount of large-particle sediment existing at the bottom of the hole during deep-hole construction in areas with a thick pebble covering layer and strong karst development, and it is difficult to control the instability of the hole wall during sediment cleaning, which seriously affects the pile-forming quality in traditional construction methods.

[0007] To achieve the above purpose, the present invention provides a method for rapid separation of sediment and control of sediment deposition in deep holes under a pebble covering layer, including the following steps:

[0008] S1. Dig a sedimentation tank: Dig a sedimentation tank, which is partitioned into a mud tank and a sediment tank. Install a return mud pump in the mud tank and connect it with a return mud pipe.

[0009] S2. Install a vibrating screen: Install a vibrating screen above the sedimentation tank. The coarse material outlet and the fine material outlet of the vibrating screen correspond to the sediment tank and the mud tank respectively.

[0010] S3. Install the slurry pump: Install the slurry pump at the orifice of the pile hole and connect it to the feed inlet of the vibrating screen through a delivery hose;

[0011] S4. Insert the conduit: Insert a conduit into the pile hole. The upper end of the conduit is connected to the slurry return pipe, and the diameter of the lower end of the conduit gradually decreases;

[0012] S5. Insert the regulating pipe: The upper end of the regulating pipe is connected to the regulating tank through a regulating pump. Mud or clear water is contained in the regulating tank, and the lower end of the regulating pipe extends into the gap between the conduit and the pile hole;

[0013] S6. Circulate and filter: Add mud to the mud tank, turn on the slurry return pump to pump the mud into the conduit. The mud is accelerated through the conduit and sprayed towards the bottom of the pile hole, flushing up the sediment and mixing with the mud in the pile hole and then surging back towards the orifice. Turn on the slurry pump to pump the surging mud to the vibrating screen for screening. The large-particle sediment enters the sediment pool, and the fine-particle sediment passes through the screen and enters the mud tank. The mud in the mud tank continues to be pumped into the conduit by the slurry return pump to form a cycle;

[0014] S7. Adjust and optimize: Inject mud through the regulating pipe. When the sediment in the surging mud decreases, inject clear water into the regulating pipe or close the regulating pipe, and reduce the working power of the slurry return pump.

[0015] Preferably, in the above technical solution, in step S3, a buffer groove is dug on the outer periphery of the orifice of the pile hole, and the slurry pump is arranged in the buffer groove.

[0016] Preferably, in the above technical solution, the buffer groove includes an annular part and a lower pump area. The annular part surrounds the outer periphery of the orifice of the pile hole. The lower pump area is located outside the annular part. The bottom of the lower pump area is lower than the bottom of the annular part, and the slurry pump is arranged in the lower pump area.

[0017] Preferably, in the above technical solution, the number of the regulating pipes is more than two. In step S5, the number of the regulating tanks is more than two. One of the regulating tanks is connected to the slurry return pipe. The regulating pumps are respectively arranged in each regulating tank, and the regulating pumps are connected to the upper ends of the regulating pipes through branch pipes and branch valves.

[0018] Preferably, in the above technical solution, in step S4, an automatic sensor is further included. The automatic sensor includes a fixed block and a movable block. The fixed block is fixedly connected to the outer side wall of the conduit, the movable block is connected to the fixed block in a slidable manner, and a pressure sensor is installed between the fixed block and the movable block.

[0019] 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 starting from 2 meters away from the lower end of the conduit, thereby forming an inverted conical surface.

[0020] Preferably, in the above technical solution, it is characterized in that branch pipes are provided on the inverted conical surface, and the outlets of the branch pipes extend downward and to the side of the conduit.

[0021] Preferably, in the above technical solution, in step S6, the conduit is rotated so that the outlets of the branch pipes rotate and spray slurry towards the bottom of the pile hole.

[0022] Preferably, in the above technical solution, the diameter at the outlets of the branch pipes gradually decreases.

[0023] Preferably, in the above technical solution, the mesh aperture of the screen 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.

[0024] Compared with the existing technologies, the present invention has the following beneficial effects:

[0025] 1. The method for rapid separation of sediment and control of sedimentation in deep holes under pebble coverings in the present invention can rapidly screen the gushing-back slurry through a vibrating screen, and then grout into a conduit with a conical structure from a slurry pond through multiple slurry return pipes, so as to form a large-flow slurry flow at the lower end of the conduit. The high-kinetic-energy slurry gushes back upward from the gaps on the side of the conduit, taking out the sediment at the bottom of the hole. Moreover, an adjustment pipe is added to the gap, and through the adjustment pipe, adjustment slurry can be injected into the gap. The adjustment slurry can further enhance the kinetic energy of the slurry gushing-back in the narrow space to continue to lift the large-particle sediment rising to the middle section, preventing the sediment from falling back midway. And the adjustment pipe can also switch to inject clear water to timely adjust the concentration of the gushing-back slurry, and at the same time reduce the working power of the slurry return pump to protect the hole wall of the pebble layer from being washed away and ensure the hole wall quality.

[0026] 2. An annular buffer groove and a pump-down area are dug on the outer periphery of the orifice of the pile foundation hole, which can be used to buffer and store the gushing-back slurry, and can push the sediment particles into the buffer groove and settle in the pump-down area, thereby further preventing the sediment after gushing-back from falling back.

[0027] 3. The number of adjustment ponds is more than two, and each adjustment pond is filled with clear water or slurry respectively. Each adjustment pond is connected to the adjustment pipe through a branch pipeline and a branch valve. By quickly switching the valve switch, rapid adjustment of the density of the gushing-back slurry can be achieved. And the adjustment pond filled with slurry can be connected to a slurry return pipe, so that the slurry can be recycled and the cost can be saved.

[0028] 4. A branch pipe is provided on the side of the inverted conical surface at the lower end of the conduit. During grouting, the grout can be ejected downward and to the side of the conduit from the branch pipe at an accelerated speed, and the conduit can drive the branch pipe to rotate synchronously during grouting, so as to scour the sediment at the corners at the bottom of the pile hole and make the sediment cleaning effect more thorough.

[0029] 5. An automatic sensor is installed on the outer wall of the conduit. It can assist in judging the sediment content in the backflow slurry by sensing the shear force during the flow of the slurry. When there is more sediment, the shear force value fluctuates greatly, and the flow rate of the return slurry pipe can be increased or the flow rate of the slurry injected through the regulating pipe can be adjusted; 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 clear 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 collapse of the hole wall. Description of the Drawings

[0030] Figure 1 is a flow chart of the method for rapid separation of deep-hole sediment and sediment control under the pebble covering layer of the present invention.

[0031] Figure 2 is a schematic installation diagram of the vibrating screen and the sedimentation tank in the present invention.

[0032] Figure 3 is a schematic structural diagram of the buffer tank in the present invention.

[0033] Figure 4 is the front view of the conduit.

[0034] Figure 5 is the top view of the conduit.

[0035] Main Reference Numeral Descriptions:

[0036] 100 - support platform, 120 - support plate;

[0037] 200 - conduit, 210 - inverted conical surface;

[0038] 300 - loop buckle;

[0039] 400 - branch pipe;

[0040] 500 - regulating pipe;

[0041] 700 - vibrating screen, 710 - slurry pond, 720 - sediment pond, 730 - fixed frame;

[0042] 800 - buffer tank, 810 - annular part, 820 - lower pump area. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top part", "bottom part", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0045] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, and understandings such as "above", "below", "within", etc. include the recited number. If there are descriptions of the terms "first", "second", "third", etc., they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0047] As Figures 1 to 5 shown, this embodiment discloses a method for rapid separation of deep-hole sediment and control of sediment under a pebble covering layer, including the following steps:

[0048] S1. Dig a sedimentation tank: Dig a sedimentation tank around the pile hole area. The sedimentation tank is partitioned into two independent areas, a slurry tank 710 and a sediment tank 720. Install several return slurry pumps in the slurry tank 710 and connect them with return slurry pipes;

[0049] S2. Install the vibrating screen: Build a fixed frame 730 above the sedimentation tank, install a vibrating screen 700 on the fixed frame 730, align the coarse material outlet of the vibrating screen 700 with the opening of the sediment pool 720, and align the fine material outlet of the vibrating screen 700 with the opening of the slurry pool 710. The mesh aperture of the screen of the vibrating screen 700 is 5 mm, the vibration frequency is adjusted to 45 - 50 Hz, and the amplitude is 0 - 2 mm;

[0050] S3. Install the slurry pump: Dig a buffer tank 800 on the outer periphery of the pile hole. The buffer tank 800 includes an annular part 810 and a lower pump area 820. The annular part 810 surrounds the orifice of the pile hole, and the lower pump area 820 is located outside the annular part 810. The bottom of the lower pump area 820 is lower than the bottom of the annular part 810. Install a slurry pump in the lower pump area 820, and connect the slurry pump to the feed inlet of the vibrating screen 700 through a delivery hose;

[0051] S4. Install the conduit: Build a support platform 100 at the orifice of the pile hole, open an installation hole on the support platform 100, install a conduit 200 in the installation hole. The diameter of the conduit 200 is d. The top of the conduit 200 is connected to the return slurry pipe. The lower end of the conduit 200 extends towards 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 starting from 2 meters away from the lower end of the conduit 200, thus forming an inverted conical surface 210. A branch pipe 400 is welded at the inverted conical surface 210, and the outlet of the branch pipe 400 extends towards the lower side of the conduit 200, and the diameter at the outlet of the branch pipe 400 gradually decreases;

[0052] S5. Install the regulating pipe: The top of the regulating pipe 500 is connected to the regulating tank through a regulating pump. The number of regulating tanks is more than two and they can be moved independently. Slurry or clear water is filled in each regulating tank respectively. The regulating tank filled with slurry is connected to a return slurry pipe. The regulating pumps are installed in each regulating tank respectively. 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 conduit 200 and the inner wall of the pile hole;

[0053] S6. Circulating filtration: First, add a part of slurry into the slurry pool 710, turn on the return slurry pump. The slurry is sprayed into the pile hole after being accelerated by the conduit 200. At the same time, rotate the conduit 200 so that the slurry is ejected from the lower end of the conduit 200 and the branch pipe 400 to wash up the sediment at the bottom of the pile hole and mix it with the slurry, and then the mixture surges back into the buffer tank 800. Turn on the slurry pump to send the surging slurry into the inlet of the vibrating screen 700 for screening. Large - particle (diameter greater than 5 mm) pebbles and part of the coarse sand are intercepted by the screen and flow into the sediment pool 720 from the coarse material outlet. Fine - particle (diameter less than or equal to 5 mm) sediment passes through the screen and flows into the slurry pool 710. The slurry in the slurry pool 710 is continuously pumped into the conduit 200 by the return slurry pump to form a cycle;

[0054] S7. Adjustment and optimization: Turn on the regulating pump in the regulating tank filled with mud to inject mud into the regulating pipe 500. Then, the automatic sensor can sense the shear force during the mud flow. When the measured value and fluctuation of the shear force are large, it indicates that there is still sediment remaining in the hole, and the flow rate of the return slurry pipe or the flow rate of the mud injected into the regulating pipe 500 can be increased. When the measured value and fluctuation of the shear force are small, it indicates that the sediment in the hole has been basically cleared, and the working power of the return slurry pump and the flow rate of the return slurry pipe can be reduced. At the same time, close the regulating pipe 500. When the mud density at the feeding port of the vibrating screen 700 is large, clean water can be injected through the regulating pipe 500 to reduce the scouring force on the pile hole wall, prevent collapse, and at the same time, the concentration of the backflowing mud can be lowered to improve the screening effect.

[0055] More specifically, 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 conduit 200. The movable block is connected to the fixed block in a slidable manner and can slide along the axial direction of the conduit 200. A pressure sensor is installed between the movable block and the fixed block. When the mud in the gap between the conduit 200 and the pile hole surges back, it can impact the movable block, so that the shear force can be detected through the pressure sensor. When the movable block is impacted by larger sediment particles, the fluctuation amplitude of the real-time pressure measurement value of the pressure sensor is large and irregular. After the large particle sediment is cleared, the fluctuation amplitude of the real-time pressure measurement value of the pressure sensor is small and tends to be stable.

[0056] More specifically, the support platform 100 is a cubic frame structure. A support plate 120 is provided at the top of the support platform 100. Among them, two support plates 120 near the middle can be opened towards each other. Semi-circular holes are respectively provided at the edges of the two openable and closable support plates 120. When the two semi-circular holes are combined, an installation hole can be formed. An outwardly protruding ring buckle 300 is provided on the outer wall of the upper end of the conduit 200. The ring buckle 300 can be stuck above the installation hole, thereby positioning and installing the conduit 200 to limit the downward movement of the conduit 200 along its own axis and enable the conduit 200 to rotate around its own axis.

[0057] In summary, the method for rapid separation of sediment and control of sedimentation in deep holes under the pebble covering layer in this embodiment can rapidly screen the surging slurry through the vibrating screen 700, and then inject the slurry from the slurry pit 710 into the conduit 200 with a conical structure through multiple slurry return pipes, so as to form a large-flow slurry flow at the lower end of the conduit 200. The high-kinetic-energy slurry flow surges upward from the gaps on the side of the conduit 200, taking out the sediment at the bottom of the hole. Moreover, an adjustment pipe 500 is added to the gaps. Through the adjustment pipe 500, adjustment slurry can be injected into the gaps. The adjustment slurry in the narrow space can further enhance the kinetic energy of the slurry surging upward to continue to lift the large-particle sediment rising to the middle section, preventing the sediment from falling back midway. And the adjustment pipe 500 can also switch to inject clear water to timely adjust the concentration of the surging slurry, and at the same time reduce the working power of the slurry return pump to protect the hole wall of the pebble layer from being washed away and ensure the quality of the hole wall.

[0058] The foregoing description of specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations can be made in light of the above teachings. Although embodiments of the present invention have been shown and described, the specific embodiments are merely interpretations of the present invention and not limitations thereof. The specific features, structures, materials, or characteristics described can 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 applications, so that those skilled in the art can, after reading this specification, make modifications, substitutions, variations, and various different selections and changes that do not make creative contributions to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A method for rapid separation of sediment in deep holes and control of sediment under a pebble covering layer, characterized in that, It includes the following steps: S1. Dig a sedimentation tank: Dig a sedimentation tank which is partitioned into a slurry pit and a sediment pit. Install a reverse slurry pump in the slurry pit and connect it with a reverse slurry pipe. S2. Install a vibrating screen: Install a vibrating screen above the sedimentation tank. The coarse material outlet and the fine material outlet of the vibrating screen correspond to the sediment pit and the slurry pit respectively. S3. Install a slurry pumping pump: Install a slurry pumping pump at the orifice of the pile hole and connect it to the feeding port of the vibrating screen through a delivery hose. S4. Insert a conduit: Insert a conduit into the pile hole. The upper end of the conduit is connected to the reverse slurry pipe, and the diameter of the lower end of the conduit gradually decreases. S5. Insert an adjustment pipe: The upper end of the adjustment pipe is connected to an adjustment tank through an adjustment pump. Mud or clear water is contained in the adjustment tank, and the lower end of the adjustment pipe extends into the gap between the conduit and the pile hole. S6. Circulate and filter: Add mud into the slurry pit, turn on the reverse slurry pump to pump the mud into the conduit. The mud is accelerated and sprayed towards the bottom of the pile hole through the conduit, flushing up the sediment and mixing it with the mud in the pile hole, then surging back towards the orifice. Turn on the slurry pumping pump to pump the surging mud to the vibrating screen for screening. The large-particle sediment enters the sediment pit, and the fine-particle sediment passes through the screen and enters the slurry pit. The mud in the slurry pit continues to be pumped into the conduit by the reverse slurry pump to form a cycle. S7. Adjust and optimize: Inject mud through the adjustment pipe. When the sediment in the surging mud decreases, inject clear water into the adjustment pipe or close the adjustment pipe, and reduce the working power of the reverse slurry pump. In step S4, it also includes an automatic sensor. The automatic sensor includes a fixed block and a movable block. The fixed block is fixedly connected to the outer side wall of the conduit. The movable block is connected to the fixed block in a slidable manner, and a pressure sensor is installed between the fixed block and the movable block.

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

3. The method for rapid sediment separation and sediment control in deep holes under a pebble covering layer according to claim 2, wherein The buffer groove includes an annular part and a lower pump area. The annular part surrounds the outer periphery of the orifice of the pile hole. The lower pump area is located outside the annular part, and the bottom of the lower pump area is lower than the bottom of the annular part. The slurry pumping pump is arranged in the lower pump area.

4. The method for rapid separation of sediment in deep holes and sediment control under a pebble covering layer according to claim 1, wherein In step S5, the number of the adjustment tanks is more than two. One of the adjustment tanks is connected to the reverse slurry pipe. The adjustment pumps are respectively arranged in each adjustment tank. The adjustment pumps are connected to the upper end of the adjustment pipe through branch pipes and branch valves.

5. The rapid sediment separation and sediment control method for deep holes under the pebble covering layer according to claim 1, characterized in that, In step S4, the diameter of the conduit is d. The diameter of the conduit starts to gradually decrease to d / 2 at a distance of 2 meters from the lower end of the conduit, thus forming an inverted conical surface.

6. The method for rapid sediment separation and sediment control in deep holes under pebble covering layers according to claim 5, characterized in that A branch pipe is arranged on the inverted conical surface, and the outlet of the branch pipe extends towards the side lower part of the conduit.

7. The method for rapid sediment separation and sediment control in deep holes under a pebble covering layer according to claim 6, characterized in that, In step S6, rotate the conduit to make the outlet of the branch pipe spray slurry towards the bottom of the pile hole.

8. The method for rapid separation of sediment in deep holes and control of sediment under a pebble covering layer according to claim 7, characterized in that, The diameter of the outlet of the branch pipe gradually decreases.

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

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