Pumping drainage system for deep foundation pit dewatering

Abstract

The invention discloses a pump drainage system, particularly discloses a pump drainage system for deep foundation pit dewatering, and belongs to the technical field of design and manufacturing of deep foundation pit engineering dewatering and drainage process equipment. According to the pumping drainage system for deep foundation pit dewatering, the water drainage amount can be adjusted according to water level changes, and it is avoided that pumping equipment is repeatedly turned on and turned off within a short time. The pumping drainage system comprises a deep foundation pit, a water collecting pit is formed in the bottom of the deep foundation pit, the pumping drainage system further comprises a water suction pump, water conveying pipes, a water level detecting and adjusting mechanism and a control system, and the water conveying pipes are connected to the inlet end and the outlet end of the water suction pump correspondingly. The tail end of the inlet end water conveying pipe is arranged in the sump through a water level detecting and adjusting mechanism, and the tail end of the outlet end water conveying pipe is located outside the deep foundation pit. In the deep foundation pit dewatering process, the input power of the water suction pump is adjusted and determined through the control system according to water level information obtained by the water level detecting and adjusting mechanism.

Description

Technical Field

[0001] The invention relates to a pumping and drainage system, in particular to a pumping and drainage system for dewatering a deep foundation pit, and belongs to the technical field of design and manufacturing of dewatering process equipment for deep foundation pit engineering. Background Art

[0002] At present, in the field of foundation pit dewatering construction, dewatering is mainly carried out by the cooperation of manual labor and pumping equipment, among which manual inspection and monitoring are particularly important. In addition, the dewatering of foundation pits is basically carried out over a long period of time, and personnel cannot be in working condition for as long as machines. In addition, the amount of water at the bottom of the foundation pit and the change of water level cannot be monitored and adjusted in time by personnel at all times, which can easily lead to damage to the pumping equipment and fail to ensure that the water level at the bottom of the foundation pit is in a safe position for construction, bringing quality and safety hazards to the construction of foundation pits and slopes, and easily causing damage to personnel and equipment. The technical solution disclosed in the "Suspended Pumping Device" uses the buoyancy of water to place the pumping equipment on the water surface and can be dragged at will, but it cannot solve the problem of the equipment touching the bottom caused by water level changes. At the same time, when the water level is lower than the minimum requirement of the pumping equipment, it is easy to cause the equipment to idle and be damaged. Personnel are still required to check and control at any time, which cannot liberate labor and has low intelligence. The technical solution disclosed in the "Water Level Elevation Automatic Pumping Equipment" solves the idling problem of the pumping equipment by monitoring the water level, but it directly switches the pumping equipment on and off based on the water level, ignoring the adverse effects between the water level changes and the power of the pumping equipment. When the water level is reached for only a moment, the pumping equipment is switched on and off due to the short-term drop in the water level, which will cause the pumping equipment to be in a repeated state of opening and closing. The corresponding equipment is in a state of starting and closing at any time, which can easily cause damage to the equipment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a pumping and drainage system for deep foundation pit dewatering that can adjust the drainage volume according to water level changes and avoid repeated switching of pumping equipment in a short period of time.

[0004] The technical solution adopted to solve the above technical problems is: a pumping and drainage system for deep foundation pit dewatering, including a deep foundation pit, at the bottom of which a sump is arranged, the pumping and drainage system also includes a water pump, a water pipe, a water level detection and adjustment mechanism and a control system, the inlet and outlet ends of the water pump are respectively connected with water pipes, the end of the inlet water pipe is arranged in the sump through the water level detection and adjustment mechanism, and the end of the outlet water pipe is located outside the deep foundation pit; during the deep foundation pit dewatering process, the input power of the water pump is adjusted and determined by the control system according to the water level information obtained by the water level detection and adjustment mechanism.

[0005] Furthermore, the water pipe is a steel pipe or a non-metallic environmentally friendly refractory pipe. When the water pipe is a steel pipe, a rotating joint pipe connected by a rotating bearing is connected in series on at least the water pipe at the inlet end, and the rotating joint pipe is arranged between the input end of the water pump and the water pipe.

[0006] A preferred embodiment of the above scheme is that the control system at least includes a control button and a computer mainboard containing an editable module, and the control button, the control end of the water pump and the signal output end of the water level detection and adjustment mechanism are all connected to the computer mainboard.

[0007] Furthermore, the water level detection and adjustment mechanism includes a suspended support structure, a water level detection component and a gear adjustment control component. The end of the water supply pipe at the inlet end is arranged in a sump below the water surface through the suspended support structure. The gear adjustment control component is arranged on the suspended support structure. The water level detection component is plugged into the gear adjustment control component. The water level detection component can move vertically back and forth through its lower end in cooperation with the bottom of the sump and the water level. Information on changes in the water level in the sump is transmitted to the control system through the water level detection component in cooperation with the gear adjustment control component.

[0008] A preferred embodiment of the above scheme is that the suspension support structure is composed of a rubber air cushion, the end of the inlet water pipe is arranged at the geometric center of the rubber air cushion, and the end of the inlet water pipe is also covered with an isolation grille.

[0009] Furthermore, the gear adjustment control component includes a mounting frame, a power switch and at least three groups of contactors, the power switch is arranged on the top of the mounting frame, and the groups of contactors are arranged on the mounting frame at intervals in the vertical direction; the water level detection component penetrates into the mounting frame vertically from the lower end, and the water level detection component passes through each group of contactors one by one with the cooperation of the bottom of the sump and is connected with the power switch when there is no water in the sump; the input power of the water pump is adjusted by the water level detection component passing through each group of contactors one by one with the cooperation of the control system, and is turned off when the water level detection component is connected with the power switch.

[0010] A preferred embodiment of the above scheme is that the gear adjustment control component further includes a signal transmission line, and the power switch and each group of contactors are respectively connected to the control system via the signal transmission line.

[0011] Furthermore, the water level detection assembly is composed of a telescopic adjustment probe, the mounting frame is composed of a non-metallic casing, the power switch is arranged on the inner side of the top of the non-metallic casing, each group of contactors is arranged vertically coaxially in the non-metallic casing, a sealing ring is provided at the lower end of the non-metallic casing, the telescopic adjustment probe passes through the sealing ring and extends into the non-metallic casing and passes through each group of contactors one by one with the cooperation of the bottom of the sump.

[0012] The preferred embodiment of the above scheme is that an installation foundation is provided on the bottom surface of the deep foundation pit outside the sump, and a sedimentation tank is provided on the foundation outside the deep foundation pit. The water pump is arranged on the bottom surface of the deep foundation pit outside the sump through the installation foundation, and the end of the outlet water pipe is connected to the sedimentation tank.

[0013] Furthermore, the rubber air cushion is in the shape of a single circular ring, a double circular ring, a hollow cross or a hollow star, and an air pump is also arranged on the rubber air cushion, and a control end of the air pump is connected to the control system.

[0014] The beneficial effects of the present invention are as follows: the technical solution provided by the present application is based on an existing qualified deep foundation pit for excavation, and is combined with the structural feature of a sump being arranged at the bottom of the deep foundation pit. The pumping and drainage system of the present application is formed by adding a water pump, a water pipe, a water level detection and adjustment mechanism and a control system, and then the water pipe is arranged to the inlet and outlet ends of the water pump respectively, and the end of the water pipe at the inlet end is arranged in the sump through the water level detection and adjustment mechanism, and the end of the water pipe at the outlet end is placed outside the deep foundation pit; finally, during the precipitation process of the deep foundation pit, the input power of the water pump is adjusted and determined by the control system according to the water level information obtained by the water level detection and adjustment mechanism, so as to achieve the control of the pumping and drainage volume according to the water collection volume in the sump, which not only eliminates the need for manual water level and water volume determination and then opening and closing the water pump in the prior art, but also can minimize the occurrence of repeated switching of the pumping equipment in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a pumping and drainage system for deep foundation pit dewatering according to the present invention;

[0016] Figure 2 The present invention is a schematic structural diagram of the assembly of a water level detection component and a gear control and adjustment component involved in a pumping and drainage system for deep foundation pit dewatering.

[0017] Marked in the figure are: deep foundation pit 1, sump 2, water pump 3, water pipe 4, swivel joint pipe 5, control button 6, computer motherboard 7, suspended support structure 8, isolation fence 9, mounting frame 10, power switch 11, contactor 12, signal transmission line 13, water level detection component 14, installation foundation 15, sedimentation tank 16. DETAILED DESCRIPTION

[0018] like Figure 1 , Figure 2The present invention provides a pumping and drainage system for deep foundation pit dewatering that can adjust the drainage volume according to the change of water level and avoid the repeated opening and closing of the pumping equipment in a short period of time. The pumping and drainage system includes a deep foundation pit 1, at the bottom of which is a sump 2. The pumping and drainage system also includes a pumping pump 3, a water pipe 4, a water level detection and adjustment mechanism, and a control system. The inlet and outlet ends of the pumping pump 3 are respectively connected to the water pipe 4. The end of the inlet water pipe is arranged in the sump 2 through the water level detection and adjustment mechanism, and the end of the outlet water pipe is located outside the deep foundation pit 1. During the dewatering process of the deep foundation pit, the input power of the pumping pump 3 is adjusted and determined by the control system according to the water level information obtained by the water level detection and adjustment mechanism. The technical solution provided by the present application is based on an existing qualified deep foundation pit excavated, and is combined with the structural feature of a sump at the bottom of the deep foundation pit. The pumping and drainage system of the present application is formed by adding a water pump, a water pipe, a water level detection and adjustment mechanism and a control system, and then the water pipe is arranged to the inlet and outlet ends of the water pump respectively, and the end of the inlet water pipe is arranged in the sump through the water level detection and adjustment mechanism, and the end of the outlet water pipe is placed outside the deep foundation pit; finally, during the precipitation of the deep foundation pit, the input power of the water pump is adjusted and determined by the control system according to the water level information obtained by the water level detection and adjustment mechanism, so as to achieve the control of the pumping and drainage volume according to the water collection volume in the sump, which not only eliminates the need for manual water level and water volume determination and then opening and closing the water pump in the prior art, but also can minimize the repeated switching of the pumping equipment in a short period of time. In combination with the prior art, the water pipe 4 of the present application can be a steel pipe or a non-metallic environmentally friendly refractory pipe. When the water pipe is a steel pipe, a rotary joint pipe 5 connected by a rotary bearing is connected in series on at least the water pipe at the inlet end, and the rotary joint pipe 5 is arranged between the input end of the water pump and the water pipe; the control system of the present application includes at least a control button 6 and a computer motherboard 7 containing an editable module, and the control button 6, the control end of the water pump 3 and the signal output end of the water level detection and adjustment mechanism are all connected to the computer motherboard 7.

[0019] Accordingly, as the main component improved in the present application, in order to control the work of the water pump according to the water level and water volume to the maximum extent, and to improve the automation rate as much as possible, and at the same time to simplify the structure of each component improved in the present application as much as possible, so as to facilitate manufacturing, use and subsequent reuse, the water level detection and adjustment mechanism of the present application includes a suspension support structure 8, a water level detection component 14 and a gear adjustment control component, the end of the water pipe at the inlet end is arranged in the sump 2 below the water surface through the suspension support structure 8, the gear adjustment control component is arranged on the suspension support structure 8, the water level detection component 14 is plugged into the gear adjustment control component, and the water level detection component 14 can move back and forth vertically through its lower end in cooperation with the bottom of the sump and the water level; the information of the water level change in the sump 2 is transmitted to the control system through the water level detection component 14 in cooperation with the gear adjustment control component. At this time, the suspension support structure 8 described in the present application is composed of a rubber air cushion, the end of the water pipe at the inlet end is arranged at the geometric center of the rubber air cushion, and the end of the water pipe at the inlet end is also covered with a barrier 9. The gear adjustment control component includes a mounting frame 10, a power switch 11 and at least three groups of contactors 12. The power switch 11 is arranged on the top of the mounting frame 10, and each group of contactors 12 is arranged on the mounting frame 10 at intervals from each other vertically; the water level detection component 14 penetrates into the mounting frame 10 vertically from the lower end, and the water level detection component 14 passes through each group of contactors 12 one by one with the cooperation of the bottom of the sump and is connected with the power switch 11 when there is no water in the sump 2; the input power of the water pump 3 is adjusted by the water level detection component 14 passing through each group of contactors 12 one by one with the cooperation of the control system, and is turned off when the water level detection component 14 is connected with the power switch 11. The water level detection assembly 14 is composed of a telescopic adjustment probe, the mounting frame 10 is composed of a non-metallic sleeve, the power switch 11 is arranged on the inner side of the top of the non-metallic sleeve, and each group of contactors 12 is arranged vertically coaxially in the non-metallic sleeve. A sealing ring is provided at the lower end of the non-metallic sleeve. The telescopic adjustment probe passes through the sealing ring and extends into the non-metallic sleeve and passes through each group of contactors 12 one by one with the cooperation of the bottom of the sump.

[0020] A more specific structure is that the gear adjustment control component also includes a signal transmission line 13, and the power switch 11 and each group of contactors 12 are respectively connected to the control system through the signal transmission line 13. An installation foundation 15 is also provided on the bottom surface of the deep foundation pit outside the sump, and a sedimentation tank 16 is also provided on the foundation outside the deep foundation pit. The water pump 3 is arranged on the bottom surface of the deep foundation pit outside the sump through the installation foundation 15, and the end of the outlet water pipe is connected to the sedimentation tank 16. In order to improve stability, the rubber air cushion of the present application is a single circular ring, a double circular ring, a hollow cross or a hollow star, and an air pump is also provided on the rubber air cushion, and the control end of the air pump is connected to the control system.

[0021] The pumping and drainage system provided in this application solves the problems in the current foundation pit dewatering construction technology field, such as low degree of automation, high rate of manual participation, low work efficiency, high auxiliary construction cost, serious waste of raw materials and insufficient safety. In view of the fact that the current foundation pit dewatering construction field mostly adopts the processing method of manual cooperation with pumping equipment, the inspection and maintenance of pumping equipment requires people with professional skills, and a large number of novice operators on site, the uneven quality of personnel, resulting in frequent equipment damage, the instability of foundation pit dewatering leads to the instability of the inside and slope of the foundation pit, which in turn affects the safety of construction personnel in the foundation pit, and the water level of foundation pit dewatering does not meet the requirements, resulting in unqualified construction quality, resulting in a large amount of waste of materials and equipment, low construction efficiency and other problems. The technical solution of this application reduces the participation of manual labor, liberates the labor force, and adopts full automation to reduce the adverse effects caused by insufficient professional ability of manual labor. While using the buoyancy of water, it effectively solves the occurrence of bottoming, idling, and blockage of pumping equipment. By using the telescopic adjustment probe, the power of the pumping equipment can be dynamically adjusted to improve the construction efficiency while ensuring the normal operation of the equipment, and it is energy-saving and environmentally friendly. In the long run, the invention of the device and its construction method is in line with the long-term development goals of science and technology and automation in the national construction industry, and can also enhance the technical strength and competitiveness of enterprises in this construction field.

[0022] The technical solution of the present application is further described below through specific embodiments:

[0023] Structure composition:

[0024] The device system is mainly composed of 16 components.

[0025] 1. Sump: After the bottom of the foundation pit is excavated, a sump is built to collect groundwater and place rubber air cushions and related equipment for pumping pipes;

[0026] 2. Gear adjuster: This device is composed of telescopic contactor, power switch and telescopic adjustment probe. Main function: When the water level in the sump is insufficient, the rubber air cushion cannot fully support the pumping pipe and the front equipment by buoyancy. The position of the telescopic adjustment probe is lower than the water inlet of the pipe. The probe first touches the bottom of the sump. The probe is retractable. When the water level is sufficient and the buoyancy is sufficient, the probe does not touch the bottom. When the water level is insufficient and the buoyancy is insufficient, the probe extends into the gear regulator according to the gradual drop of the water level. The regulator is divided into 3 sections of telescopic contactors. The power output of this stage can be started and stopped through each section of the contactor. In theory, telescopic contactors can be added as needed to control different power output powers, so as to achieve a relatively stable stage by changing the output power, underground output and groundwater level, so as not to affect the pumping efficiency and equipment damage due to the different water output at different points in the foundation pit and different geological conditions and the different water level changes. Finally, when the probe is in the ultimate extreme position of the power switch, this state is a safety limiter to prevent the rubber air cushion from being damaged and causing the pipeline and equipment to directly touch the bottom. At the same time, it is a safety limit for the protection equipment when the foundation pit water level is insufficient and the probe touches the bottom.

[0027] 3. Isolation fence: One or more isolation fences can be set according to the actual needs of the site. Its function is to isolate the equipment from being blocked and damaged by large stones, wood chips and other debris in the water;

[0028] 4. Rubber air cushion: The rubber air cushion is thickened to prevent damage from general sharp objects. It can be connected and disassembled with the pipeline and used repeatedly. The size of the air cushion is matched with the size of the pipeline. The air cushion can be replaced and matched according to the selected pipeline size, length and equipment;

[0029] 5. Pipeline: The pipe material can be steel pipe or other durable materials, and environmental protection is preferred. The length of the pipe can be changed according to the needs of the site, but the air cushion is used in combination with it. The pipe is reusable and detachable, and is used to connect the water pump and the foundation pit;

[0030] 6. Control circuit, used for connecting the gear regulator and the control main board, and controlling the power output of the pumping equipment through data transmission;

[0031] 7. Rotary joint: This device is located at the top of the sump and is arranged in parallel with the pumping equipment. It uses a bearing connection to connect two pipes side by side. It can be extended into the foundation pit pipe by fixing the side pipe of the pumping equipment and can move freely up and down. It is also a key device for adjusting the height of the pipe up and down through the buoyancy of the air cushion.

[0032] 8. Water pumps, pumping equipment, the key to the output of pumping power, can be selected according to the height, depth and pumping efficiency of the foundation pit;

[0033] 9. Control mainboard and switch. This device is located above the water pump and consists of a computer mainboard and related control buttons. The mainboard control program adjusts the output power of the water pump through data transmission of the gear regulator. At the same time, the device can also be manually operated to prevent the safety control of the water pump in the event of a short circuit or program failure.

[0034] 10. The foundation is made of concrete, and steel plates and bolts can be embedded in advance to ensure the stability and safety of related equipment;

[0035] 11. The limit support is connected to the water pump and other related equipment through the foundation pre-steel plate and bolts to limit the adverse effects of equipment deviation, displacement, shaking, etc.

[0036] 12. Sedimentation tank: the outlet of the pipeline is located in the sedimentation tank. The sedimentation tank is divided into three levels of sedimentation to ensure that the water pumped out of the foundation pit meets the environmental discharge standards. The tank is regularly desilted;

[0037] 13. Telescopic contactor. This device is located inside the gear adjuster and is composed of a spring device. There is a small gap between the contactors when they are not working. When the probe is inserted into the gap, the contactor shrinks to the surroundings and tightly contacts the probe. The contact is divided into several sections. When entering a section, the gear is automatically adjusted to that section, and the previous section stops automatically. It is mainly used for the control of power gear. The more the probe is inserted, the smaller the gear is, and the power output becomes smaller accordingly. When the buoyancy and water level are sufficient, the probe automatically drops and the output power is maximum.

[0038] 14. Power switch: This device is a protective limit switch. When the probe touches the bottom due to air cushion damage or insufficient water level, it prevents the equipment from being blocked and damaged and directly shuts down the power;

[0039] 15. Telescopic adjustment probe. This device is in the shape of a rod and made of steel. It is located at the bottom edge of the pipeline, 30 cm below the pipeline mouth. It can be extended up and down. When the water level and buoyancy are insufficient, it is used to support the pipeline and related equipment. The device is inserted into the gear regulator. The power output can be adjusted by the insertion length. The output power can be adjusted by contacting with the telescopic contactors at each level. When the buoyancy is sufficient, it is always in the first level with the maximum output power. As the length of the probe inserted into the gear regulator increases, the output power decreases. Finally, when it completely touches the bottom, the probe is inserted into the bottom, the power switch is turned off, and all equipment is shut down to ensure the safety of personnel and equipment.

[0040] 16. Rotating bearing: This device is located in the middle of the rotating joint, ensuring that the two pipes can rotate up and down smoothly.

[0041] Operation or use instructions:

[0042] 1. Before using this device and construction method, build a sump and sedimentation tank in advance according to the construction drawings, geological survey data and precipitation requirements. The surrounding area of ​​the sump needs to be hardened, and the location of the pumping equipment should be compacted and the foundation poured in advance. The pumping equipment, pipelines, air cushions, etc. of this device should be customized according to the depth of the foundation pit, the amount of groundwater, etc.

[0043] 2. Transport the device to the site and check whether the foundation and embedded bolts are correct. First, install the water pump and use the limit support to connect it tightly to the foundation to prevent offset and displacement caused by shaking. Install the control main board and switch, and then install the pipeline. Inflate the rubber air cushion to the specified air pressure, install the isolation fence at the water inlet of the pumping pipeline, and install the gear adjuster at the pipeline mouth. The telescopic adjustment probe extends 30 cm out of the pipeline mouth and connects the pipeline through the swivel joint with the cooperation of the swivel bearing; connect the control line to the control main board. After all the equipment is assembled, debug and check the equipment.

[0044] 3. When the device is in normal working state, the rubber air cushion is located on the water surface, the telescopic adjustment probe is located at the lowest end of the gear regulator, and at the same time it is in the first stage of the telescopic contactor, and its output power is the largest; when the underground water output is insufficient or the water level cannot meet the buoyancy requirements, the telescopic adjustment probe is located at the bottom of the pipeline and will gradually extend into the gear regulator. The longer the extension length and the more the telescopic contactor contacts, the smaller the output power. When the underground output is balanced with the output power at this stage, the device will be in this stage for a long time; when the underground water suddenly becomes serious and the air cushion is damaged, the telescopic adjustment probe directly touches the bottom and extends into the deepest part of the gear regulator, which will turn off the power switch and provide safety protection for the device.

[0045] 4. The pipelines and related equipment of this device can be disassembled, convenient for transportation and reused

[0046] To sum up, the device and its construction method fill the problem of lack of intelligent machinery in the field of foundation pit dewatering construction technology, strengthen the application of new construction technologies in this field, improve construction efficiency, reduce the problem of insufficient pumping efficiency caused by rapid changes in groundwater volume and water level, reduce equipment loss rate, and play a positive role in the innovation and improvement of foundation pit dewatering construction technology.

[0047] 2. The device and its construction method adopt intelligent control, which reduces the waste of manpower, reduces the safety risks of personnel, and reduces the rate of quality and safety accidents caused by human factors, saves the construction period, reduces the waste of raw materials, reduces construction costs, and has higher economic benefits.

[0048] 3. The device and its construction method are easy to assemble and transport, can be reused, avoid waste of materials, save energy and protect the environment, adopt new technologies and new processes, serve the society, and take the safety of construction workers as the consideration point. If it can be vigorously promoted to other construction fields or other regions, it will not only bring huge economic benefits to the enterprise, but also bring good social benefits to the enterprise.

[0049] Embodiment 1

[0050] The implementation method is detailed in the accompanying drawings and technical solutions.

[0051] As shown in the figure, the device is mainly divided into 16 parts.

[0052] The first step is to customize the supporting equipment of this device according to the construction drawings, geological survey reports, precipitation requirements, construction plans and other relevant information, such as the depth of the foundation pit, the size of the sump, the power of the pumping equipment, etc.

[0053] The second step is to carry out corresponding measures such as foundation treatment, plane planning, sump construction, slope support, etc. on site according to the equipment.

[0054] The third step is to use a truck crane to install and debug the device that has been transported to the site, especially to conduct corresponding tests for the following two situations: 1. When the water level drops suddenly, whether the telescopic probe of the device turns off the power switch; 2. When the groundwater output suddenly increases or decreases, whether the gear regulator operates normally.

[0055] The fourth step is that one set of the device can only correspond to a shorter precipitation range. If a larger precipitation range is required, the number of corresponding equipment sets can be increased. At the same time, the device is easy to disassemble and can be reused. After the implementation is completed, maintenance is required to facilitate subsequent storage and use.

Claims

1. A pumping and drainage system for dewatering a deep foundation pit, comprising a deep foundation pit (1), a sump (2) being arranged at the bottom of the deep foundation pit (1), and characterized in that: The pumping and drainage system further comprises a water pump (3), a water pipe (4), a water level detection and adjustment mechanism and a control system. The water pipe (4) is respectively connected to the inlet and outlet of the water pump (3). The end of the water pipe at the inlet is arranged in the sump (2) through the water level detection and adjustment mechanism, and the end of the water pipe at the outlet is located outside the deep foundation pit (1). During the dewatering process of the deep foundation pit, the input power of the water pump (3) is adjusted and determined by the control system according to the water level information obtained by the water level detection and adjustment mechanism.

2. The pumping and drainage system for deep foundation pit dewatering according to claim 1, characterized in that: The water pipe (4) is a steel pipe or a non-metallic environmentally friendly refractory pipe. When the water pipe is a steel pipe, at least a rotary joint pipe (5) connected via a rotary bearing is serially connected to the water pipe at the inlet end. The rotary joint pipe (5) is arranged between the input end of the water pump and the water pipe.

3. The pumping and drainage system for deep foundation pit dewatering according to claim 2 is characterized in that: The control system comprises at least a control button (6) and a computer mainboard (7) containing an editable module, and the control button (6), the control end of the water pump (3) and the signal output end of the water level detection and adjustment mechanism are all connected to the computer mainboard (7).

4. The pumping and drainage system for deep foundation pit dewatering according to claim 1, 2 or 3, characterized in that: The water level detection and adjustment mechanism comprises a suspension support structure (8), a water level detection component (14) and a gear adjustment control component. The end of the water delivery pipe at the inlet end is arranged in a sump (2) below the water surface through the suspension support structure (8). The gear adjustment control component is arranged on the suspension support structure (8). The water level detection component (14) is plugged into the gear adjustment control component. The water level detection component (14) can move vertically back and forth through its lower end in cooperation with the bottom of the sump and the water level. Information on the change of the water level in the sump (2) is transmitted to the control system through the water level detection component (14) in cooperation with the gear adjustment control component.

5. The pumping and drainage system for deep foundation pit dewatering according to claim 4, characterized in that: The suspension support structure (8) is composed of a rubber air cushion, the end of the water pipe at the inlet end is arranged at the geometric center of the rubber air cushion, and the end of the water pipe at the inlet end is also covered with an isolation fence (9).

6. The pumping and drainage system for deep foundation pit dewatering according to claim 5, characterized in that: The gear adjustment control component comprises a mounting frame (10), a power switch (11) and at least three groups of contactors (12), wherein the power switch (11) is arranged at the top of the mounting frame (10), and each group of contactors (12) is arranged on the mounting frame (10) at intervals in the vertical direction; a water level detection component (14) vertically penetrates into the mounting frame (10) from the lower end, and the water level detection component (14) passes through each group of contactors (12) one by one with the cooperation of the bottom of the sump, and is connected with the power switch (11) when there is no water in the sump (2); the input power of the water pump (3) is adjusted by the water level detection component (14) passing through each group of contactors (12) one by one with the cooperation of the control system, and is turned off when the water level detection component (14) is connected with the power switch (11).

7. The pumping and drainage system for deep foundation pit dewatering according to claim 6, characterized in that: The gear adjustment control component also includes a signal transmission line (13), and the power switch (11) and each group of contactors (12) are respectively connected to the control system through the signal transmission line (13).

8. The pumping and drainage system for deep foundation pit dewatering according to claim 7, characterized in that: The water level detection assembly (14) is composed of a telescopic adjustment probe, the mounting frame (10) is composed of a non-metallic sleeve, the power switch (11) is arranged on the inner side of the top of the non-metallic sleeve, each group of contactors (12) is arranged vertically coaxially in the non-metallic sleeve, a sealing ring is provided at the lower end of the non-metallic sleeve, the telescopic adjustment probe passes through the sealing ring and extends into the non-metallic sleeve and passes through each group of contactors (12) one by one with the cooperation of the bottom of the sump.

9. The pumping and drainage system for deep foundation pit dewatering according to claim 8, characterized in that: An installation foundation (15) is also provided on the bottom surface of the deep foundation pit outside the sump, and a sedimentation tank (16) is also provided on the foundation outside the deep foundation pit. The water pump (3) is arranged on the bottom surface of the deep foundation pit outside the sump through the installation foundation (15), and the end of the outlet water delivery pipe is connected to the sedimentation tank (16).

10. The construction method of the pumping and drainage system for deep foundation pit dewatering according to claim 9, characterized in that: The rubber air cushion is in the shape of a single circular ring, a double circular ring, a hollow cross or a hollow star. An air pump is also arranged on the rubber air cushion, and a control end of the air pump is connected to a control system.

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