Deep foundation pit underground internal and external water level blocking and isolating structure and isolating method thereof

Abstract

The invention relates to the technical field of blocking and isolating structures, in particular to a blocking and isolating structure for underground internal and external water levels of a deep foundation pit and an isolating method thereof.The blocking and isolating structure comprises a workbench assembly, a driving assembly and a perforated pipe assembly, the driving assembly is fixedly connected to one end of the workbench assembly, and the perforated pipe assembly is rotationally connected to the inner side of the driving assembly; the driving assembly comprises a machine table plate, a machine fixing plate is fixedly connected to the top end of the machine table plate, a control motor is fixedly connected to the top end of the machine fixing plate, a gear is fixedly connected to the tail end of a main shaft of the control motor, and a supporting column is fixedly connected to the top end of the machine table plate; according to the device, it is ensured that the surrounding environment outside a pit is not affected during the period of precipitation in the pit, and the problems of ground surface deformation, building cracking and structure displacement caused by a traditional construction method are solved.

Description

Technical Field

[0001] The invention relates to the technical field of blocking and isolating structures, and in particular to a blocking and isolating structure for underground inner and outer water levels of a deep foundation pit and an isolation method thereof. Background Art

[0002] As my country's economic strength grows stronger, the speed of urban construction continues to accelerate, and rail transit projects are invested and constructed on a large scale across the country. The excavation and dewatering construction of deep foundation pits of subway stations may lead to the risk of massive loss of groundwater resources and settlement of buildings near the foundation pits, which poses a great threat to the gushing of groundwater in water-rich areas and the safety of the surrounding environment. Therefore, it is particularly important to find a balance between engineering construction, water resource protection and the safety of the surrounding environment, and further study the deep foundation pit bottom sealing and waterproofing technology;

[0003] In water-rich areas, when constructing deep foundation pits for subway stations, the groundwater level is high, the underground pressure water volume is large and the burial depth is shallow. Traditional precipitation construction may lead to immeasurable risks, especially in areas close to railway lines, bridges or other important buildings and structures. According to the Railway Safety Management Regulations, construction near railways in station areas is considered a railway-related project, and projects with precipitation construction within 200 meters around railway lines require special attention;

[0004] In the prior art, the bottom sealing and waterproofing measures for deep foundation pits usually adopt the traditional high-pressure jet grouting process. However, this method may cause problems such as surface deformation, building cracking, and structure displacement during the construction process, which has a great impact on the environment. There is a need for a new bottom sealing and waterproofing technology that can effectively cut off the connection between the water levels inside and outside the deep foundation pit and ensure that there is no impact on the surrounding environment outside the pit during precipitation in the pit. Therefore, in response to the above problems, a deep foundation pit underground internal and external water level sealing and isolation structure and an isolation method thereof are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a deep foundation pit underground internal and external water level blocking and isolation structure and an isolation method thereof, so as to solve the problem that in the prior art, the bottom sealing and water isolation measures of deep foundation pits usually adopt the traditional high-pressure jet grouting process, but this method may cause surface deformation, building cracking, structure displacement and other problems during the construction process, which has a great impact on the environment.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A deep foundation pit underground water level blocking and isolation structure, including a workbench assembly, a driving assembly and a porous pipe assembly, one end of the workbench assembly is fixedly connected to the driving assembly, the inner side of the driving assembly is rotatably connected to the porous pipe assembly, the inner side of the porous pipe assembly is fixedly connected to an external straight pipe, a pumping assembly and a drill bit assembly, the driving assembly includes a machine plate, the top of the machine plate is fixedly connected to a fixed machine plate, the top of the fixed machine plate is fixedly connected to a control motor, the end of the main shaft of the control motor is fixedly connected to a gear, the top of the machine plate is fixedly connected to a support column, the top of the support column is fixedly connected to a storage trough, the bottom of the storage trough is fixedly connected to a first Two hoses, a third hose is fixedly connected to the top of the external straight pipe, a first hose is fixedly connected to the top of the pumping assembly, the porous tube assembly includes a porous tube body, a wire tube is fixedly connected to the inner side of the porous tube body, a pressure detector is fixedly connected to the lower end of the wire tube, an opening is provided at the lower end of the porous tube body, a built-in disk is fixedly connected to the inner side of the porous tube body, a bearing is fixedly connected to the outer side of the porous tube body, a gear ring is fixedly connected to the outer side of the porous tube body, the outer side of the bearing is fixedly connected to the inner side of the machine plate, the bottom end of the second hose is fixedly connected to the top of the drill assembly, and the left side of the machine plate is fixedly connected to the workbench assembly.

[0008] As a further optimization content of the present invention, the workbench assembly includes a base, a pressure monitor is fixedly connected to the top of the base, a frame is fixedly connected to the inner side of the base, a guide rail groove is opened on the inner side of the frame, a multi-stage hydraulic telescopic rod is fixedly connected to the upper end of the frame, and a guide rail plate is fixedly connected to the bottom end of the multi-stage hydraulic telescopic rod.

[0009] As a further optimization of the present invention, the guide rail plate is shaped like a dovetail, the guide rail groove is opened in a dovetail shape, the guide rail plate is slidably connected to the inner side of the guide rail groove, and a spacing is set between the right side of the base and the left side of the machine plate.

[0010] As further optimized content of the present invention, the drill bit assembly includes a built-in pipe, a material passage is opened on the inner side of the built-in pipe, a fan blade partition is fixedly connected to the inner side of the material passage opened by the built-in pipe, a built-in column is fixedly connected to one side of the fan blade partition, the outer side of the built-in pipe near the lower end is fixedly connected to a chassis block, a drill bit is fixedly connected to the bottom end of the chassis block, and a drill bit is opened on the inner side of the chassis block.

[0011] As a further optimization of the present invention, the top end of the built-in pipe is fixedly connected to the bottom end of the second hose, the inside of the second hose is hollow, the second hose is connected to the inside of the material storage trough, the inside of the second hose is connected to the inside of the material channel opened by the built-in pipe, the fan blade partition is in the shape of a fan, the fan blade partitions are vertically arranged in two rows, and a spacing is set between each row of the fan blade partitions.

[0012] As further optimized content of the present invention, the inner side of the built-in disk is hollow, the number of the built-in disks is multiple, the built-in pipe is embedded and fixed on the inner side of the built-in disk, a distance is provided between the outer side of the built-in pipe and the inner side of the porous tube body, a through hole is provided on the inner side of the built-in disk close to the pumping component, and the pumping component is fixedly connected to the inner side of the through hole of the built-in disk.

[0013] As a further optimization of the present invention, the top of the chassis block is fixedly connected to the bottom of the porous tube body, a column groove is opened on the inner side of the chassis block, the column groove passes through the inner side of the chassis block up and down, and the chassis block is fixedly connected to the outer side of the external straight tube through the column groove.

[0014] As a further optimization content of the present invention, the inner side of the external straight tube is hollow, a through hole is opened on the inner side of the built-in disk close to the external straight tube, the external straight tube is fixedly connected to the inner side of the built-in disk, the inner side of the external straight tube is connected to the opening, the opening passes through the outer side of the porous tube body, and the opening is close to the lower end of the porous tube body.

[0015] As further optimized content of the present invention, the water pumping assembly includes a straight water pipe, a metal wear-resistant head is fixedly connected to the bottom end of the straight water pipe, a water inlet groove is opened on the inner side of the metal wear-resistant head, the inner side of the straight water pipe is hollow, the inner side of the straight water pipe is connected to the water inlet groove, a hydraulic push rod is fixedly connected to the inner side of the water inlet groove opened in the straight water pipe, a metal block is fixedly connected to one side of the hydraulic push rod, a rubber pad is fixedly connected to the side of the metal block close to the hydraulic push rod, an external through hole is opened on the inner side of the straight water pipe, a filter plate is fixedly connected to the inner side of the external through hole opened in the straight water pipe, and a filter hole is opened on the inner side of the filter plate.

[0016] A method for isolating a structure of underground inner and outer water levels of a deep foundation pit;

[0017] S1: Start the control motor to drive the gear to rotate, and the outer side of the gear is meshed with the outer side of the gear ring. During the rotation of the gear, the gear ring drives the porous tube body to rotate. The porous tube body is connected to the inner side of the machine plate through the bearing rotation. Through the control of the gear, the porous tube body is rotated 270 degrees counterclockwise and clockwise respectively. The rotation of the porous tube body drives the drill bit assembly to rotate as a whole, and the drill bit splits the soil. The multi-stage hydraulic telescopic rod is started to drive the guide rail plate to move downward. The guide rail plate is slidably connected to the inner side of the guide rail groove. When the guide rail plate moves downward, it drives the drive assembly, the porous tube assembly, the pumping assembly, the external straight pipe and the drill bit assembly to move downward as a whole;

[0018] S2: When the porous pipe assembly and the drill bit assembly are extended into the ground, the pressure in the hole is monitored in time through the cooperation of the pressure detector, the line pipe and the pressure monitor, and the existing mud pump is started to suck the inside of the third hose, and the mud is transported from a low place to a high place by using centrifugal force;

[0019] S3: The porous pipe assembly and the drill bit assembly rotate as a whole and move downward, the hydraulic push rod is started to push the rubber pad and the metal block away from the outside through hole, and the external water pump pumps water into the first hose. At this time, the water at the lower end of the chassis block is transported out through the metal wear-resistant head, the straight water pipe and the first hose. The cement slurry is prepared according to the specification requirements and the mix ratio and stored in the storage tank. At the same time, the slurry in the storage tank is vibrated when the built-in pipe rotates, so that the cement slurry in the storage tank passes through the second hose and enters the material channel opened in the built-in pipe, and the cement slurry is separated by the fan blade partition;

[0020] S4: Water is transported to the inside of the third hose through an external water pump, enters the outside straight pipe through the third hose, and is discharged through the opening. Water is then transported to the inside of the first hose, the straight water pipe and the metal wear-resistant head through the water pump.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the present invention, a workbench assembly, a driving assembly, a porous tube assembly and a drill bit are provided, and the device adopts a three-wing diamond drill bit to guide the hole, and strictly monitors the verticality of the borehole and the stability of the formation during the construction process, and corrects the deviation and controls the verticality in time. This refined construction method can significantly improve the accuracy and stability of the borehole. In addition, the use of bentonite artificial slurry wall protection further enhances the safety of the drilling process. At the same time, through the reasonable arrangement of equipment and efficient operation procedures, the work efficiency is greatly improved, the labor intensity is reduced, and the smooth progress of the drilling construction is ensured, laying a solid foundation for subsequent construction;

[0023] 2. In the present invention, by means of the porous pipe assembly and the drill bit assembly, the device can monitor the pressure in the hole in real time and adjust the mud discharge volume by using the slurry suction holes, which can ensure that the ground pressure is always kept within a reasonable range, thereby avoiding surface deformation or soil instability caused by excessive pressure. This pressure control mechanism effectively reduces the risk of soil squeezing effect during construction and reduces the impact on the surrounding environment. At the same time, by reasonably controlling the slurry discharge volume and the ground pressure, the uniformity and stability of the pile diameter are ensured. Especially in deep reinforcement construction, pressure detection can ensure the uniformity of the pile body at different depths and geological conditions, and avoid changes in the pile body diameter caused by pressure fluctuations, thereby significantly improving the construction quality and safety;

[0024] 3. In the present invention, by providing a pumping assembly and a drill assembly, the device not only effectively avoids problems such as surface deformation, building cracking or structure displacement caused by precipitation, but also further enhances the stability in the hole by precisely controlling the delivery and solidification of cement slurry. In this way, the construction process can better adapt to complex geological conditions, reduce interference with surrounding facilities, and achieve harmonious coexistence of construction and environment;

[0025] 4. In the present invention, by setting up the pumping assembly and the external straight pipe, the device realizes efficient cleaning of the components. This cleaning method is not only convenient and fast, but also can significantly improve the cleanliness of the equipment and reduce equipment failures caused by residual mud or impurities. At the same time, the cleaned equipment can be put into the next drilling operation more quickly, thereby greatly improving the construction efficiency, reducing the equipment maintenance cost, and providing a strong guarantee for continuous construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the frame structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the machine plate of the present invention;

[0029] Figure 4 This is a schematic diagram of the control motor structure of the present invention;

[0030] Figure 5 It is a schematic diagram of the cutaway structure of the porous tube body of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the built-in disk of the present invention;

[0032] Figure 7 It is a schematic diagram of the cutaway structure of the metal wear-resistant head of the present invention;

[0033] Figure 8 It is a schematic diagram of the cutaway structure of the built-in pipeline of the present invention;

[0034] Fig. 9 It is a schematic diagram of the structure of the hydraulic push rod of the present invention;

[0035] Fig.10 For the present invention Fig. 9 Schematic diagram of the structure at point A.

[0036] In the figure: 1, workbench assembly; 11, base; 12, pressure monitor; 13, frame; 14, guide rail groove; 15, multi-stage hydraulic telescopic rod; 16, guide rail plate;

[0037] 2. Driving assembly; 21. Machine plate; 22. Fixing plate; 23. Control motor; 24. Gear; 25. Support column; 26. Material storage tank; 27. First hose; 28. Second hose; 29. ​​Third hose;

[0038] 3. porous tube assembly; 31. porous tube body; 32. wire tube; 33. pressure detector; 34. opening; 35. built-in disk; 36. bearing; 37. gear ring;

[0039] 4. External straight pipe;

[0040] 5. Pumping assembly; 51. Straight water pipe; 52. Metal wear-resistant head; 53. Water inlet tank; 54. Hydraulic push rod; 55. Metal block; 56. Rubber pad; 57. External through hole; 58. Filter plate; 59. Filter hole;

[0041] 6. Drill bit assembly; 61. Built-in pipeline; 62. Material channel; 63. Fan blade partition; 64. Built-in column; 65. Chassis block; 66. Drill bit; 67. Column groove. DETAILED DESCRIPTION

[0042] 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.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] See also Figure 1-10 , the present invention provides a technical solution:

[0045] A deep foundation pit underground water level blocking and isolation structure and isolation method thereof, comprising a workbench assembly 1, a driving assembly 2 and a porous pipe assembly 3, one end of the workbench assembly 1 is fixedly connected to the driving assembly 2, the inner side of the driving assembly 2 is rotatably connected to the porous pipe assembly 3, the inner side of the porous pipe assembly 3 is fixedly connected to an external straight pipe 4, a pumping assembly 5 and a drill assembly 6, the driving assembly 2 comprises a machine plate 21, the top of the machine plate 21 is fixedly connected to a fixed machine plate 22, the top of the fixed machine plate 22 is fixedly connected to a control motor 23, the end of the main shaft of the control motor 23 is fixedly connected to a gear 24, the top of the machine plate 21 is fixedly connected to a support column 25, the top of the support column 25 is fixedly connected to a storage tank 26, the bottom of the storage tank 26 is fixedly connected to The second hose 28, the third hose 29 is fixedly connected to the top of the external straight pipe 4, the first hose 27 is fixedly connected to the top of the pumping assembly 5, the porous tube assembly 3 includes a porous tube body 31, a wire tube 32 is fixedly connected to the inner side of the porous tube body 31, a pressure detector 33 is fixedly connected to the lower end of the wire tube 32, an opening 34 is provided at the lower end of the porous tube body 31, a built-in disk 35 is fixedly connected to the inner side of the porous tube body 31, a bearing 36 is fixedly connected to the outer side of the porous tube body 31, a gear ring 37 is fixedly connected to the outer side of the porous tube body 31, and the outer side of the bearing 36 is fixedly connected to the inner side of the machine plate 21, the bottom end of the second hose 28 is fixedly connected to the top of the drill bit assembly 6, and the left side of the machine plate 21 is fixedly connected to the workbench assembly 1.

[0046] As a further implementation scheme of this scheme, the workbench assembly 1 includes a base 11, a pressure monitor 12 is fixedly connected to the top of the base 11, a frame 13 is fixedly connected to the inner side of the base 11, a guide rail groove 14 is opened on the inner side of the frame 13, a multi-stage hydraulic telescopic rod 15 is fixedly connected to the upper end of the frame 13, and a guide rail plate 16 is fixedly connected to the bottom end of the multi-stage hydraulic telescopic rod 15, the guide rail plate 16 is in the shape of a dovetail body, and the guide rail groove 14 is opened in the shape of a dovetail body. The guide rail plate 16 is slidably connected to the inner side of the guide rail groove 14, and a spacing is set between the right side of the base 11 and the left side of the machine plate 21. Through the above setting, through the structural design of the workbench assembly 1, the dovetail shape of the guide rail plate 16 is slidably connected to the dovetail body of the guide rail groove 14, which can ensure the stable movement of the drill bit assembly 6 during the drilling process. At the same time, the spacing design between the base 11 and the machine plate 21 facilitates the installation and operation of the equipment, thereby improving the flexibility and stability of the construction;

[0047] As a further implementation of the present scheme, the drill bit assembly 6 includes a built-in pipe 61, a material passage 62 is provided inside the built-in pipe 61, a fan blade partition 63 is fixedly connected to the inside of the material passage 62 provided in the built-in pipe 61, a built-in column 64 is fixedly connected to one side of the fan blade partition 63, a chassis block 65 is fixedly connected to the outer side of the built-in pipe 61 near the lower end, a drill bit 66 is fixedly connected to the bottom end of the chassis block 65, a drill bit 66 is provided inside the chassis block 65, the top end of the built-in pipe 61 is fixedly connected to the bottom end of the second hose 28, the inside of the second hose 28 is hollow, and the first The second hose 28 is connected to the inner side of the material storage tank 26, and the inner side of the second hose 28 is connected to the inner side of the material passage 62 opened by the built-in pipe 61. The fan blade partition 63 is in the shape of a fan-shaped body. The fan blade partition 63 is vertically arranged in two rows, and a spacing is set between each row of the fan blade partition 63. Through the above arrangement, the design of the drill bit assembly 6 can effectively control the falling speed of the cement slurry through the separation function of the fan blade partition 63, ensure the uniform distribution and solidification of the cement slurry in the hole, thereby improving the stability and uniformity of the solidification in the hole, and preventing surface deformation and building cracking;

[0048] As a further implementation of this solution, the inner side of the built-in disk 35 is hollow, the number of built-in disks 35 is multiple, the built-in pipe 61 is embedded and fixed on the inner side of the built-in disk 35, and a spacing is set between the outer side of the built-in pipe 61 and the inner side of the porous tube body 31. A through hole is opened on the inner side of the built-in disk 35 close to the pumping component 5, and the pumping component 5 is fixedly connected to the inner side of the through hole of the built-in disk 35. Through the above arrangement, the hollow structure and multiple through-hole design of the built-in disk 35 can effectively reduce the weight of the equipment, and at the same time provide a channel for the flow of mud, reduce construction resistance, and the spacing design between the built-in pipe 61 and the porous tube body 31 facilitates the installation and maintenance of the equipment, and improves the flexibility of construction;

[0049] As a further implementation of this solution, the top of the chassis block 65 is fixedly connected to the bottom of the porous pipe body 31, and a column groove 67 is opened on the inner side of the chassis block 65. The column groove 67 runs through the inner side of the chassis block 65 from top to bottom. The chassis block 65 is fixedly connected to the outer side of the external straight pipe 4 through the column groove 67. Through the above arrangement, the fixed connection between the chassis block 65 and the porous pipe body 31 and the penetrating design of the column groove 67 can ensure the stability and rigidity of the drill bit assembly 6 during the drilling process, thereby improving the construction efficiency.

[0050] As a further implementation of the present solution, the inner side of the external straight tube 4 is hollow, and a through hole is opened on the inner side of the internal disk 35 near the external straight tube 4. The external straight tube 4 is fixedly connected to the inner side of the internal disk 35, and the inner side of the external straight tube 4 is connected to the opening 34. The opening 34 passes through the outer side of the porous tube body 31, and the opening 34 is close to the lower end of the porous tube body 31. Through the above arrangement, the effect of cleaning the drill bit is achieved. This cleaning method is convenient and fast, and the efficiency of drilling again is improved.

[0051] As a further implementation of the present invention, the pumping assembly 5 includes a straight water pipe 51, a metal wear-resistant head 52 is fixedly connected to the bottom end of the straight water pipe 51, a water inlet groove 53 is provided inside the metal wear-resistant head 52, the inside of the straight water pipe 51 is hollow, the inside of the straight water pipe 51 is connected to the water inlet groove 53, a hydraulic push rod 54 is fixedly connected to the inside of the water inlet groove 53 provided in the straight water pipe 51, a metal block 55 is fixedly connected to one side of the hydraulic push rod 54, and a rubber block 56 is fixedly connected to the side of the metal block 55 close to the hydraulic push rod 54. The rubber pad 56 and the inner side of the straight water pipe 51 are provided with an outer through hole 57, the inner side of the outer through hole 57 provided by the straight water pipe 51 is fixedly connected with a filter plate 58, and the inner side of the filter plate 58 is provided with a filter hole 59. Through the above arrangement, the design of the pumping assembly 5 can achieve the timely removal of water in the hole through the cooperation of the hydraulic push rod 54, the metal block 55 and the rubber pad 56, ensuring that there is no impact on the surrounding environment outside the pit during the precipitation in the hole, and at the same time preventing surface deformation and structure displacement, thereby improving the safety and environmental protection of the construction.

[0052] Workflow: Construction preparation, investigation and analysis of geological parameters such as geological type and groundwater type, determine design parameters such as pile diameter, bite width, reinforcement depth, cement slurry ratio, etc. according to geological survey data and specification requirements, arrange dewatering wells and water level observation wells, ensure that the dewatering wells are washed until the water is clear and the sand is clean, and the water level is stable, and select the required drilling equipment, use a three-wing diamond drill bit to drill the hole, the drilling diameter is 200mm, monitor the verticality of the borehole and the stability of the formation at any time during the pre-drilling construction, and correct the deviation in time, the verticality is controlled at 1 / multi-stage hydraulic telescopic rod 150, measure the hole in time after the hole is formed, use bentonite artificial slurry to protect the wall, the mud viscosity is ≥20s, at the same time, during the drilling process, connect the first hose 27 to the water inlet of the water pump, the water inlet of the water pump is connected to the inside of the water tank, the third hose 29 is connected to the feed pipe of the mud pump, the mud pump is aligned with the truck compartment, the mud is collected and transported, and the control motor is started 23 drives the gear 24 to rotate, and the outer side of the gear 24 meshes with the outer side of the ring gear 37. During the rotation of the gear 24, the ring gear 37 drives the porous tube body 31 to rotate. The porous tube body 31 is rotatably connected to the inner side of the machine plate 21 through the bearing 36. Through the control of the gear 24, the porous tube body 31 is rotated 270 degrees counterclockwise and clockwise respectively. The rotation of the porous tube body 31 drives the drill assembly 6 to rotate as a whole, and the soil is split by the drill bit 66. At the same time, the multi-stage hydraulic telescopic rod 15 is started to drive the guide rail plate 16 to move downward. The guide rail plate 16 is slidably connected to the inner side of the guide rail groove 14. When the guide rail plate 16 moves downward, it drives the driving assembly 2, the porous tube assembly 3, the pumping assembly 5, the external straight pipe 4 and the drill assembly 6 to move downward as a whole, thereby achieving the effect of drilling. In the process of drilling, this drilling method can ensure the accuracy and stability of drilling, while improving work efficiency, reducing labor intensity, and ensuring safety during drilling;

[0053] When ensuring the safety during drilling, according to the above principle, when the porous pipe assembly 3 and the drill bit assembly 6 are extended into the ground, the pressure detector 33, the line pipe 32 and the pressure monitor 12 can be used to timely obtain the pressure in the hole, and the real-time monitoring of the pressure in the hole can ensure that the pressure in the ground is kept within a reasonable range. When the pressure is too high, the mud discharge volume can be adjusted by controlling the opening size of the slurry suction hole, thereby avoiding surface deformation or soil instability caused by excessive pressure. By starting the existing mud pump to suck the inside of the third hose 29, the centrifugal force is used to transport the mud from a low place to a high place, thereby achieving the effect of mud removal. This pressure control mechanism can effectively reduce the risk of soil squeezing effect during construction and reduce the impact on the surrounding environment. Through pressure detection, the slurry discharge volume and the ground pressure can be reasonably controlled to ensure the uniformity and stability of the pile diameter. In deep reinforcement construction, pressure detection can ensure the uniformity of the pile body at different depths and geological conditions, and avoid changes in the pile body diameter due to pressure fluctuations.

[0054] When the water in the hole is not affected by the surrounding environment outside the pit, in the process of the porous pipe assembly 3 and the drill bit assembly 6 rotating and moving downward as a whole, the hydraulic push rod 54 is started to push the rubber pad 56 and the metal block 55 away from the inside of the external through hole 57, and the first hose 27 is pumped by the external water pump. At this time, the water at the lower end of the chassis block 65 is transported out through the metal wear-resistant head 52, the straight water pipe 51 and the first hose 27, so that the water in the hole can be removed in time. The cement slurry is modulated according to the specification requirements and the mix ratio and stored in the storage tank 26. At the same time, the mud liquid in the storage tank 26 is vibrated when the built-in pipe 61 rotates, so that the cement slurry in the storage tank 26 passes through the second hose 28 and enters the material channel 62 opened in the built-in pipe 61. The cement slurry is separated by the fan blade partition 63, and the falling speed of the cement slurry can be controlled. Through the solidification of the cement slurry, the hole is fixed, thereby preventing the deformation of the surface, cracking of the building, and displacement of the structure.

[0055] When cleaning the drill bit assembly 6 and the porous tube assembly 3, water is transported to the inside of the third hose 29 through an external water pump, enters the outside of the external straight tube 4 through the third hose 29, and is discharged through the opening 34. During the rotation and upward movement of the porous tube body 31, the outside of the porous tube body 31 is cleaned, and water is transported to the inside of the first hose 27, the straight water pipe 51 and the metal wear-resistant head 52 through a water pump to clean the drill bit. This cleaning method is convenient and quick, and improves the efficiency of drilling again.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A deep foundation pit underground water level blocking and isolation structure, comprising a workbench assembly (1), a drive assembly (2) and a porous pipe assembly (3), characterized in that: One end of the workbench assembly (1) is fixedly connected to a driving assembly (2), the inner side of the driving assembly (2) is rotatably connected to a porous tube assembly (3), and the inner side of the porous tube assembly (3) is fixedly connected to an external straight pipe (4), a water pumping assembly (5) and a drill assembly (6); The driving assembly (2) comprises a machine plate (21), the top of the machine plate (21) is fixedly connected to a fixing plate (22), the top of the fixing plate (22) is fixedly connected to a control motor (23), the end of the main shaft of the control motor (23) is fixedly connected to a gear (24), the top of the machine plate (21) is fixedly connected to a support column (25), the top of the support column (25) is fixedly connected to a material storage tank (26), the bottom of the material storage tank (26) is fixedly connected to a second hose (28), the top of the external straight pipe (4) is fixedly connected to a third hose (29), The top of the water pumping assembly (5) is fixedly connected to a first hose (27), the porous tube assembly (3) comprises a porous tube body (31), the inner side of the porous tube body (31) is fixedly connected to a wire tube (32), the lower end of the wire tube (32) is fixedly connected to a pressure detector (33), the lower end of the porous tube body (31) is provided with an opening (34), the inner side of the porous tube body (31) is fixedly connected to a built-in disk (35), the outer side of the porous tube body (31) is fixedly connected to a bearing (36), and the outer side of the porous tube body (31) is fixedly connected to a gear ring (37); The outer side of the bearing (36) is fixedly connected to the inner side of the machine plate (21), the bottom end of the second hose (28) is fixedly connected to the top end of the drill assembly (6), and the left side of the machine plate (21) is fixedly connected to the workbench assembly (1).

2. The deep foundation pit underground water level blocking and isolating structure according to claim 1 is characterized by: The workbench assembly (1) comprises a base (11), the top of the base (11) is fixedly connected to a pressure monitor (12), the inner side of the base (11) is fixedly connected to a frame (13), the inner side of the frame (13) is provided with a guide rail groove (14), the upper end of the frame (13) is fixedly connected to a multi-stage hydraulic telescopic rod (15), and the bottom end of the multi-stage hydraulic telescopic rod (15) is fixedly connected to a guide rail plate (16).

3. The deep foundation pit underground water level blocking and isolating structure according to claim 2 is characterized by: The guide rail plate (16) is in the shape of a dovetail, the guide rail groove (14) is in the shape of a dovetail, the guide rail plate (16) is slidably connected to the inner side of the guide rail groove (14), and a spacing is provided between the right side of the base (11) and the left side of the machine plate (21).

4. The deep foundation pit underground water level blocking and isolating structure according to claim 1 is characterized by: The drill bit assembly (6) comprises an internal pipe (61), a material passage (62) is provided inside the internal pipe (61), a fan blade partition (63) is fixedly connected inside the material passage (62) provided in the internal pipe (61), a built-in column (64) is fixedly connected to one side of the fan blade partition (63), a chassis block (65) is fixedly connected to the outer side of the internal pipe (61) near the lower end, a drill bit (66) is fixedly connected to the bottom end of the chassis block (65), and a drill bit (66) is provided inside the chassis block (65).

5. The deep foundation pit underground internal and external water level blocking and isolating structure according to claim 4 is characterized by: The top end of the built-in pipe (61) is fixedly connected to the bottom end of the second hose (28); the inside of the second hose (28) is hollow; the second hose (28) is connected to the inside of the material storage tank (26); the inside of the second hose (28) is connected to the inside of the material passage (62) opened by the built-in pipe (61); the fan blade partition (63) is in the shape of a fan; the fan blade partition (63) is vertically arranged in two rows; and a spacing is provided between each row of the fan blade partitions (63).

6. The deep foundation pit underground internal and external water level blocking and isolating structure according to claim 4 is characterized by: The inner side of the built-in disk (35) is hollow, and the number of the built-in disks (35) is multiple. The built-in pipe (61) is embedded and fixed on the inner side of the built-in disk (35), and a distance is provided between the outer side of the built-in pipe (61) and the inner side of the porous pipe body (31). A through hole is provided on the inner side of the built-in disk (35) close to the pumping assembly (5), and the pumping assembly (5) is fixedly connected to the inner side of the through hole of the built-in disk (35).

7. The deep foundation pit underground internal and external water level blocking and isolating structure according to claim 4 is characterized by: The top end of the chassis block (65) is fixedly connected to the bottom end of the porous pipe body (31); a column groove (67) is provided on the inner side of the chassis block (65); the column groove (67) penetrates the inner side of the chassis block (65) from top to bottom; and the chassis block (65) is fixedly connected to the outer side of the external straight pipe (4) through the column groove (67).

8. The deep foundation pit underground internal and external water level blocking and isolating structure according to claim 1 is characterized by: The inner side of the external straight tube (4) is hollow, the inner side of the internal disk (35) is provided with a through hole near the inner side of the external straight tube (4), the external straight tube (4) is fixedly connected to the inner side of the internal disk (35), the inner side of the external straight tube (4) is connected to the opening (34), the opening (34) passes through the outer side of the porous tube body (31), and the opening (34) is close to the lower end of the porous tube body (31).

9. The deep foundation pit underground internal and external water level blocking and isolating structure according to claim 1, characterized in that: The pumping assembly (5) comprises a straight water pipe (51), the bottom end of which is fixedly connected to a metal wear-resistant head (52), a water inlet groove (53) is provided inside the metal wear-resistant head (52), the inside of the straight water pipe (51) is hollow, the inside of the straight water pipe (51) is connected to the water inlet groove (53), a hydraulic push rod (54) is fixedly connected inside the water inlet groove (53) provided in the straight water pipe (51), a metal block (55) is fixedly connected to one side of the hydraulic push rod (54), a rubber pad (56) is fixedly connected to the side of the metal block (55) close to the hydraulic push rod (54), an external through hole (57) is provided inside the straight water pipe (51), a filter plate (58) is fixedly connected inside the external through hole (57) provided in the straight water pipe (51), and a filter hole (59) is provided inside the filter plate (58).

10. A method for isolating a structure for blocking and isolating the underground inner and outer water levels of a deep foundation pit according to any one of claims 1 to 9, characterized in that: S1: Start the control motor (23) to drive the gear (24) to rotate. The outer side of the gear (24) meshes with the outer side of the ring gear (37). During the rotation of the gear (24), the ring gear (37) drives the porous tube body (31) to rotate. The porous tube body (31) is rotatably connected to the inner side of the machine plate (21) through the bearing (36). Through the control of the gear (24), the porous tube body (31) rotates 270 degrees counterclockwise and clockwise respectively. The rotation of the porous tube body (31) drives the drill bit assembly (6) to rotate as a whole. The drill bit (66) splits the soil. The multi-stage hydraulic telescopic rod (15) is started to drive the guide rail plate (16) to move downward. The guide rail plate (16) is slidably connected to the inner side of the guide rail groove (14). When the guide rail plate (16) moves downward, the driving assembly (2), the porous tube assembly (3), the pumping assembly (5), the external straight pipe (4) and the drill bit assembly (6) are driven to move downward as a whole. S2: When the porous pipe assembly (3) and the drill bit assembly (6) are extended into the ground, the pressure in the hole is timely monitored by the cooperation of the pressure detector (33), the wire pipe (32) and the pressure monitor (12), and the existing mud pump is started to suck the inside of the third hose (29), so as to transport the mud from a low place to a high place by using centrifugal force; S3: The porous pipe assembly (3) and the drill bit assembly (6) rotate as a whole and move downward, the hydraulic push rod (54) is started to push the rubber pad (56) and the metal block (55) away from the inside of the external through hole (57), and the external water pump pumps water from the inside of the first hose (27). At this time, the water at the lower end of the chassis block (65) is transported out through the metal wear-resistant head (52), the straight water pipe (51) and the first hose (27), and the cement slurry is prepared according to the specification requirements and the mixing ratio and stored in the storage tank (26). At the same time, the mud liquid in the storage tank (26) is vibrated when the built-in pipe (61) rotates, so that the cement slurry in the storage tank (26) passes through the second hose (28) and enters the inside of the material channel (62) opened in the built-in pipe (61), and the cement slurry is separated by the fan blade partition (63); S4: water is transported to the inside of the third hose (29) through an external water pump, enters the inside of the external straight pipe (4) through the third hose (29), is discharged through the opening (34), and water is transported to the inside of the first hose (27), the straight water pipe (51) and the metal wear-resistant head (52) through the water pump. Through the above arrangement, through the structural design of the workbench assembly (1), the dovetail shape of the guide rail plate (16) is slidably connected with the dovetail shape of the guide rail groove (14), which can ensure the stable movement of the drill bit assembly (6) during the drilling process. At the same time, the spacing design between the base (11) and the machine plate (21) facilitates the installation and operation of the equipment, thereby improving the flexibility and stability of the construction.

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