Method for monitoring sudden inrush of confined water in super-large and super-deep foundation pit excavation

Abstract

A method for monitoring the sudden surge of pressurized water in the excavation of a super-large and super-deep foundation pit, the method comprising the following steps: step 1, drilling a hole inside the foundation pit; step 2, fixing and laying out a device; step 3, fixing a drainage pipe; step 4, measuring the pressurized water; step 5, disposing of drainage; step 6, measuring the deformation value of the uplift of the bottom of the foundation pit. The present invention can not only realize intelligent monitoring of pressurized water and accurately reach the stratum containing pressurized water, but also realize the measurement of the uplift value of the deep foundation pit, and has the advantages of simple operation, low cost, intelligence, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation pit engineering monitoring, and relates to a method for monitoring pressurized water inrush in super-large and super-deep foundation pit excavation, and is suitable for monitoring pressurized water inrush in foundation pit excavation strata. Background Art

[0002] Coastal areas have abundant groundwater, complex foundation soil layers, and weak permeable layers. During the excavation of ultra-large and ultra-deep foundation pits, there will be pressurized water in the soil layers. The presence of pressurized water can cause uplift and instability at the bottom of the foundation pit, which is one of the major risk sources for deep foundation pit projects.

[0003] At present, in order to ensure the safety during the excavation of deep foundation pits, the first solution is to insert a water-stop curtain into the aquiclude below the confined water aquifer to isolate the confined water; the second solution is to dig a dewatering well before construction, and gradually reduce the head height of the confined water as the foundation pit is further excavated to ensure the safety of the deep foundation pit excavation process. However, if the excavation depth of the foundation pit is large and the confined water aquifer is complex, the deep foundation pit excavation still causes confined water to surge. Therefore, it is of great significance to deploy a confined water intelligent monitoring device before the deep foundation pit excavation. When a confined water surge occurs in a deep foundation pit, the self-weight pressure of the overlying soil layer cannot withstand the head pressure of the confined water, which will cause groundwater to surge into the deep foundation pit. In addition, it will increase the difficulty and construction process of the construction, and at the same time, it will extend the construction period and increase the construction cost. Existing devices for preventing sudden surges of pressurized water have the following two problems: first, the pressure change of pressurized water cannot be determined by the device and can only be solved by precipitation; second, the sudden surge caused by pressurized water will cause the bottom of the foundation pit to bulge, and there is currently no equipment to measure the change in the bottom bulge value. Summary of the invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention provides a device and method for monitoring the sudden surge of pressurized water in the excavation of super-large and super-deep foundation pits, which can not only realize the intelligent monitoring of pressurized water and accurately reach the stratum containing pressurized water, but also realize the measurement of the uplift value of the bottom of the deep foundation pit. It has the advantages of simple operation, low cost and intelligence.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A method for monitoring confined water inrush during super-large and super-deep foundation pit excavation, the method comprising the following steps:

[0007] Step 1: Drill holes inside the foundation pit

[0008] Use a drilling rig to drill multiple holes inside the foundation pit, set up a retaining wall, insert a PVC pipe of equal diameter to the bottom of the drill hole and the pressure water layer, and fill the outer end of the PVC pipe with clay to prevent the PVC pipe from tilting. Multiple holes can be drilled according to the size of the foundation pit;

[0009] Step 2: Fixing and arranging the device

[0010] The lower end of the center position of the fixed bracket is connected to the upper end of the sleeve by a chain. The sleeve is provided with an intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits, and multiple sets of rollers are provided at the lower left and right ends of the fixed bracket, so that the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits can be moved arbitrarily. Then, the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits is placed in a preset PVC pipe to the bottom of the drilled hole. According to the number of holes drilled, multiple intelligent devices can be arranged;

[0011] Step 3: Fix the drain pipe

[0012] A top cover is provided at the lower end of the sleeve, which is in the shape of a cylindrical hole and is arranged at the left and right ends of the drain pipe. The middle hole is used to insert the drain pipe. The diameter of the hole can be determined according to the diameter of the drain pipe. The lower end of the top cover is connected to the box shell by welding to fix the lower end position of the drain pipe to prevent the drain pipe from falling off when discharging pressurized water.

[0013] Step 4: Measurement of pressurized water

[0014] When the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits is lowered to the PVC pipe through the chain, the operations of other parts can be carried out. A pipeline ball valve is provided in the middle part of the bottom end of the device, and fixers are provided at both ends of the pipeline ball valve. An eight-shaped groove is provided at the lower end. The pressurized water flows into the channel through the groove. A filter is provided in the channel. In order to prevent impurities from flowing into the device, when the pressurized water flows into the channel, when the pressure reaches a certain value, it will push the ball in the pipeline ball valve to move, so that the pressurized water passes through the channel. A water pressure sensor is provided at the upper end of the pipeline ball valve, and its value is measured by the water pressure sensor. When the pressurized water flows into the pressurized water chamber through the channel, three small ball valves are provided in the upper part of the pressurized water chamber, and three pressure sensors are provided on the side of the small ball valve. , used to check the accuracy of its pressurized water value. When the pressurized water flows into the pressurized water chamber through three small ball valves, when the pressure of the pressurized water is large enough, four slider ball valves are arranged around the bottom end of the device at 90 degrees, and the pressurized water flows into the pressurized water chamber from the slider ball valve. When the head pressure of the pressurized water in the pressurized water chamber is large enough, it will slide upward through the slide plate on the rolling circle. A slide plate ball valve is provided at the right end of the slide plate, so that the pressurized water flows into the water storage chamber through the hose. A channel pressure sensor is provided at the right end of the hose to monitor the total pressure value of the pressurized water. When the slide plate slides upward to the top, the contact of the touch pressure sensor will touch the end face of the slide plate, and the touch pressure sensor is connected to the pressure gauge on the ground surface. The operator can see the pressure value of the pressurized water through the pressure gauge.

[0015] Step 5: Drainage treatment

[0016] When the pressurized water flows into the water storage chamber, it is pumped out by the water pump at the upper end thereof. The lower end of the water pump is fixed by a pad, wherein the pad is welded to the upper end of the water storage chamber. The water pump is connected to the power controller through a multi-core conductive wire, so that the pressurized water is discharged through the drain pipe and finally reaches the sedimentation tank. The pressurized water in the sedimentation tank can be treated according to the situation.

[0017] Step 6: Measure the deformation value of the bottom of the foundation pit

[0018] Four strain gauges are arranged around the casing of the intelligent device for monitoring pressurized water inrush in super-large and super-deep foundation pits. A telescopic rod end cover is provided at the upper end. A gear is provided in the telescopic rod end cover to connect with the drill rod motor. The lower end of the telescopic rod end cover is connected with the telescopic rod. The strain gauge is connected with the multi-core conductive wire through the drill rod motor and can reach the designated measuring position. The lower end of the telescopic rod is connected with a spring to measure the small deformation of the strain gauge. A displacement sensor is provided around it and is connected with the display screen through the multi-core conductive wire. The operator observes the deformation value through the display screen.

[0019] The beneficial effects of the present invention are mainly manifested in:

[0020] (1) Accurate positioning. A multi-stage pressure sensor is used, and the pressure sensor is connected to the ball valve through a multi-core conductive wire to test the pressure change of the pressurized water. The lower end of the telescopic rod is welded to the spring, and the lower end of the spring is bonded to the strain gauge, so that the bottom end of the strain gauge is in contact with the soil inside the foundation pit. The drill rod motor can be used to adjust the telescopic rod in real time to ensure that the measurement position can be accurately reached.

[0021] (2) Low cost. Compared with commonly used monitoring equipment, this device does not need to be deployed in multiple locations, and the device is small in size. A small number of devices can be deployed to complete the monitoring of deep foundation pit pressurized water inrush, which is economical and affordable.

[0022] (3) Simple, safe and convenient operation. Operators can operate the device after receiving training from relevant technical personnel and reading the device operation method. In addition, there is no need for personnel to observe the changes in the pressurized water in the PVC pipe, eliminating the unsafe factor of pressurized water surge. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the front view of a device used to monitor sudden surges of pressurized water in super-large and super-deep foundation pit excavations.

[0024] Figure 2 yes Figure 1 Left view of .

[0025] Figure 3 It is the plan layout of the foundation pit.

[0026] Figure 4 yes Figure 1 AA cross-section diagram.

[0027] Figure 5 yes Figure 1 A cross-sectional view of the BB.

[0028] Figure 6 yes Figure 1 Cross-sectional view of CC.

[0029] Figure 7 yes Figure 1 Cross-sectional view of DD.

[0030] Figure 8 yes Figure 1 A cross-sectional view of EE. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] Reference Figures 1 to 8, a method for monitoring the sudden surge of pressurized water in the excavation of super-large and super-deep foundation pits. A deep foundation pit project uses a precipitation well for dewatering. The diameter of the well is Φ400mm and the observation wells are 155 wells inside the foundation pit and 8 wells outside the foundation pit, with a depth of 17 meters. Since the soil layer of the project is complex and it is located in the city center, and the precipitation wells are shallow, a large number of precipitation wells need to be arranged to ensure the safety during the excavation of the deep foundation pit. In addition, there are disadvantages such as inaccurate positioning, long construction period, and high cost. An intelligent device for monitoring the sudden surge of pressurized water in the excavation of super-large and super-deep foundation pits can be used to achieve rapid positioning, real-time intelligent monitoring, and rapid drainage requirements; the method comprises the following steps:

[0033] Step 1: Drill holes inside the foundation pit

[0034] As this project is an extra-large and extra-deep foundation pit, an intelligent device for monitoring the sudden surge of pressurized water during the excavation of an extra-large and extra-deep foundation pit is invented. First, a drilling rig is used to drill multiple holes inside the foundation pit, and a retaining wall is laid. A PVC pipe 3 of the same diameter is inserted into the bottom of the drill hole, and the outer end of the PVC pipe 3 is filled with clay to prevent the PVC pipe 3 from tilting. Multiple holes can be drilled according to the size of the foundation pit.

[0035] Step 2: Fixing and arranging the device

[0036] The lower end of the center position of the fixed bracket 31 is connected to the upper end of the sleeve 27 by a chain. The sleeve 27 is sleeved with an intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits, and multiple sets of rollers are provided at the lower left and right ends of the fixed bracket 31, so that the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits can be moved arbitrarily. Then, the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits is placed in the preset PVC pipe 3 to the bottom of the drilled hole. According to the number of holes drilled, multiple intelligent devices can be deployed.

[0037] Step 3: Fix the drain pipe

[0038] A top cover 4 is provided at the lower end of the sleeve 27, which is in the shape of a cylindrical hole and is arranged at the left and right ends of the drain pipe 28. The middle hole is used to insert the drain pipe 28. The diameter of the hole can be determined according to the diameter of the drain pipe. The lower end of the top cover 4 is welded to the box shell to fix the lower end position of the drain pipe 28 to prevent the drain pipe 28 from falling off when discharging pressurized water.

[0039] Step 4: Measurement of pressurized water

[0040] When the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits is lowered to the bottom of the PVC pipe 3 through the chain, the operation of other parts can be carried out. A pipeline ball valve 12 is provided in the middle part of the bottom end of the device, and a fixer 13 is provided at both ends of the pipeline ball valve 12. An eight-shaped groove is provided at its lower end, and the pressurized water flows into the channel through the groove. A filter is provided in the channel. In order to prevent impurities from flowing into the device, when the pressurized water flows into the channel, when the pressure reaches a certain value, it will push the ball in the pipeline ball valve 12 to move, so that the pressurized water passes through the channel. A water pressure sensor 14 is provided at the upper end of the pipeline ball valve 13, and its value is measured by the water pressure sensor 14. When the pressurized water flows into the pressurized water chamber 10 through the channel, three small ball valves 11 are provided in the upper part of the pressurized water chamber 10, and three pressure sensors are provided on the side of the small ball valve 11 to check the accuracy of its pressurized water value. The small ball valve 11 flows into the pressurized water chamber 10. When the pressure of the pressurized water is large enough, four slider ball valves 15 are arranged around the bottom end of the device at 90 degrees. The pressurized water flows into the pressurized water chamber 10 from the slider ball valve 15. When the head pressure of the pressurized water in the pressurized water chamber is large enough, it will slide upward through the slider 18 on the rolling ring 17. A slider ball valve 16 is provided at the right end of the slider 18, so that the pressurized water flows into the water storage chamber 25 through the hose 20. A channel pressure sensor 19 is provided at the right end of the hose 20 for monitoring the total pressure value of the pressurized water. When the slider 18 slides upward to the top, the contact of the touch pressure sensor 21 will touch the end face of the slider 18, and the pressure gauge 29 on the ground surface is connected through the touch pressure sensor 21 (the pressure gauge 29 and the touch pressure sensor 21 are connected by a multi-core conductive line). The operator sees the pressure value of the pressurized water through the pressure gauge 29.

[0041] Step 5: Drainage treatment

[0042] When the pressurized water flows into the water storage chamber 25, it is pumped out by the water pump 8 at the upper end thereof. The lower end of the water pump 8 is fixed by a pad 9, wherein the pad 9 is welded to the upper end of the water storage chamber 25. The water pump 8 is connected to the power controller 2 through a multi-core conductive line, so that the pressurized water is discharged through the drain pipe 28 and finally reaches the sedimentation tank 30. The pressurized water in the sedimentation tank 30 can be processed according to the situation.

[0043] Step 6: Measure the deformation value of the bottom of the foundation pit

[0044] Four deformation meters 22 are arranged around the casing of the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits. A telescopic rod end cover 6 is provided at the upper end. A gear is provided in the telescopic rod end cover 6 to be connected to the drill rod motor 5 (provided at both ends of the top cover 4). The lower end of the telescopic rod end cover 6 is connected to the telescopic rod 7. The deformation meter 22 is connected to the multi-core conductive wire through the drill rod motor 5 to reach the specified measuring position. The lower end of the telescopic rod 7 is connected to the spring 23 for measuring the small deformation of the deformation meter 22. A displacement sensor 24 is provided around it and is connected to the display screen 1 through the multi-core conductive wire. The operator observes the size of the deformation value through the display screen 1.

[0045] The device for implementing the method for monitoring the sudden surge of pressurized water in the excavation of super-large and super-deep foundation pits of this embodiment comprises a display screen 1, a power controller 2, a PVC pipe 3, a top cover 4, a drill rod motor 5, a telescopic rod end cover 6, a telescopic rod 7, a water pump 8, a pad 9, a pressurized water chamber 10, a small ball valve 11, a pipeline ball valve 12, a fixer 13, a water pressure sensor 14, a slider ball valve 15, a skateboard ball valve 16, a rolling ring 17, a skateboard 18, a channel pressure sensor 19, a hose 20, a touch pressure sensor 21, a strain gauge 22, a spring 23, a displacement sensor 24, a water storage chamber 25, a box shell 26, a sleeve 27, a drain pipe 28, a pressure gauge 29, a sedimentation tank 30, a fixing bracket 31 and a protective wall 32;

[0046] The display screen 1 is located at the upper end of the power controller 2, and its right end is connected to the power controller 2 through a multi-core conductive wire. The change of the pit bottom uplift value can be seen through the display screen 2;

[0047] The power controller 2 is rectangular in shape, and has a plurality of buttons on its end surface for controlling the power on and off of the drill rod motor 5, the water pump 8, the small ball valve 11, the pipeline ball valve 12, the water pressure sensor 14, the slider ball valve 15, the slide ball valve 16, the channel pressure sensor 19, the touch pressure sensor 21, the strain gauge 22, and the displacement sensor 24;

[0048] The PVC pipe 3 is located inside the foundation pit and is made of plastic. The device is inserted into the PVC pipe 3 to monitor the change value of the pressurized water and the change value of the pit bottom heave.

[0049] The top cover 4 is located below the sleeve 27, and its lower end is connected to the box shell 26 by welding, and is used to fix the lower end of the drain pipe 28;

[0050] The drill rod motor 5 is located at the outer end of the top cover 4. A total of four drill rod motors are provided. One end of the drill rod motor is welded to the top cover 4 and the lower end is welded to the box shell 26 for extending and retracting the telescopic rod 7.

[0051] The telescopic rod end cover 6 is located at the upper end of the telescopic rod 7 and plays a role in waterproofing and dustproofing;

[0052] The telescopic rod 7 is located below the telescopic rod end cover 6, and its lower end is hingedly connected to the spring 23. It is arranged around the box shell 26, and a total of four are provided for measuring the extension and contraction of the strain gauge 22;

[0053] The water pump 8 is located inside the box shell 26, with its left end connected to the drain pipe 28 and its lower end welded to the pad 9 for pumping out pressurized water;

[0054] A backing plate 9 is located below the water pump 8 and is used to fix the water pump 8;

[0055] The pressurized water chamber 10 is located below the slide plate 18 and is used to store pressurized water, which reaches the water storage chamber 25 through the hose 20;

[0056] The small ball valve 11 is located at the lower end of the pressure water chamber 9. There are three small ball valves, which are respectively arranged at the two ends and the middle position of the pressure water chamber. Its function is to see the change of pressure value under small pressure through the opening size of the small ball valve 11;

[0057] The pipeline ball valve 12 is located at the center of the eight-shaped groove at the bottom of the device, and its two ends are welded to the fixture 13, which is used to see the change of pressure value under low pressure by opening the pipeline ball valve 12;

[0058] The fixer 13 is used to fix the pipeline ball valve 12 to prevent the pipeline ball valve 12 from moving up and down;

[0059] The water pressure sensor 14 is located at the upper end of the pipeline ball valve 12 and is sleeved with the pipeline to monitor the pressure value of the pressurized water in the pipeline;

[0060] The slider ball valve 15 is located around the pressure water chamber 10, and is provided with four slider ball valves, which are used to see the change of the pressure value under the maximum pressure condition by opening the size of the slider ball valve 15;

[0061] The slide ball valve 16 is located at the right end of the slide 18, and its lower end is connected to the pressurized water chamber 10, and is used to monitor the pressure change value of the pressurized water in the pressurized water chamber;

[0062] The rolling ring 17 is located at the outer end of the slide plate 18, and the slide plate 18 moves up and down through the balls in the rolling ring 17;

[0063] The slide plate 18 is driven to move by the change of the pressurized water in the pressurized water chamber 10, thereby contacting the touch pressure sensor 21 at the upper end;

[0064] The channel pressure sensor 19 is located at the upper end of the slide plate 18, with its left end connected to the hose 20 and its lower end welded to the slide plate 18, and is used to monitor the pressure change value of the pressurized water in the hose 20;

[0065] The hose 20 is located between the slide plate 18 and the water storage chamber 25, so that the pressurized water in the pressurized water chamber 10 flows into the water storage chamber 25 through the hose 20;

[0066] The touch pressure sensor 21 is located at the upper left end of the rolling circle 17. Its function is to move the slide plate 18 upward to touch the upper end of the touch pressure sensor 21. The right end of the touch pressure sensor 21 is connected to the pressure gauge 29 through a multi-core conductive line. The operator can see the pressure change value of the pressurized water through the pressure gauge 29 on the ground.

[0067] The strain gauge 22 is located at the lower end of the spring 23 and is connected to the spring 23 by welding, and is used to measure the change of the uplift value of the pit bottom;

[0068] A spring 23, used to measure the expansion and contraction of the strain gauge 22;

[0069] The displacement sensor 24 is located between the telescopic rod 7 and the strain gauge 22, so that the strain gauge 22 reaches the bottom of the pit;

[0070] The water storage chamber 25 is connected to the hose 20 at the lower end and the drain pipe 28 at the upper end, and is used to store pressurized water;

[0071] The box shell 26 is located at the upper part of the device and plays a protective role to prevent the internal components of the device from being damaged when lowered into the foundation pit;

[0072] The sleeve 27 is welded to the box shell 26, so that the device is lowered into the foundation pit through the sleeve 27;

[0073] The drain pipe 28 has its lower end connected to the water storage chamber 25 and its right end connected to the sedimentation tank 30, and its function is to discharge the pressurized water through the drain pipe 28;

[0074] Pressure gauge 29, the operator can see the pressure value of the pressurized water through the changes of pressure gauge 29;

[0075] The left side of the sedimentation tank 30 is connected to the drainage pipe 28, which is used for the pressurized water to be discharged into the sedimentation tank 30 and then to be pumped out after settling for a period of time in order not to pollute the surrounding environment.

[0076] The contents described in the embodiments of this specification are merely enumerations of implementation forms of the inventive concept and are for illustrative purposes only. The protection scope of the present invention should not be considered to be limited to the specific forms described in this embodiment, and the protection scope of the present invention also extends to equivalent technical means that can be thought of by ordinary technicians in this field based on the inventive concept.

Claims

1. A method for monitoring the sudden inrush of pressurized water during the excavation of a super-large and super-deep foundation pit, characterized in that: The method comprises the following steps: Step 1: Drill holes inside the foundation pit Use a drilling rig to drill multiple holes inside the foundation pit, set up a retaining wall, and insert a PVC pipe of the same diameter into the bottom of the drill hole to enter the pressure water layer. Fill the outer end of the PVC pipe with clay to prevent the PVC pipe from tilting. Multiple holes can be drilled according to the size of the foundation pit; Step 2: Fixing and arranging the device The lower end of the center position of the fixed bracket is connected to the upper end of the sleeve by a chain. The sleeve is provided with an intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits, and multiple sets of rollers are provided at the lower left and right ends of the fixed bracket, so that the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits can be moved arbitrarily. Then, the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits is placed in a preset PVC pipe to the bottom of the drilled hole. According to the number of holes drilled, multiple intelligent devices can be arranged; Step 3: Fix the drain pipe A top cover is provided at the lower end of the sleeve, which is in the shape of a cylindrical hole and is arranged at the left and right ends of the drain pipe. The middle hole is used to insert the drain pipe. The diameter of the hole can be determined according to the diameter of the drain pipe. The lower end of the top cover is connected to the box shell by welding to fix the lower end position of the drain pipe to prevent the drain pipe from falling off when discharging pressurized water. Step 4: Measurement of pressurized water When the intelligent device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pits is lowered to the bottom of the PVC pipe through the chain, the operations of other parts can be carried out. A pipeline ball valve is provided in the middle part of the bottom end of the device, and fixers are provided at both ends of the pipeline ball valve. An eight-shaped groove is provided at the lower end. Pressurized water flows into the channel through the groove. A filter is provided in the channel. In order to prevent impurities from flowing into the device, when pressurized water flows into the channel, when the pressure reaches a certain value, it will push the ball in the pipeline ball valve to move, so that pressurized water passes through the channel. A water pressure sensor is provided at the upper end of the pipeline ball valve, and its value is measured by the water pressure sensor. When pressurized water flows into the pressurized water chamber through the channel, three small ball valves are provided in the upper part of the pressurized water chamber, and three pressure sensors are provided on the side of the small ball valve. The device is used to check the accuracy of its pressurized water value. When the pressurized water flows into the pressurized water chamber through three small ball valves, when the pressure of the pressurized water is large enough, four slider ball valves are arranged around the bottom of the device at 90 degrees, and the pressurized water flows into the pressurized water chamber from the slider ball valve. When the head pressure of the pressurized water in the pressurized water chamber is large enough, it will slide upward through the slide plate on the rolling circle. A slide plate ball valve is provided at the right end of the slide plate, so that the pressurized water flows into the water storage chamber through a hose. A channel pressure sensor is provided at the right end of the hose to monitor the total pressure value of the pressurized water. When the slide plate slides upward to the top, the contact of the touch pressure sensor will touch the end face of the slide plate, and the operator can see the pressure value of the pressurized water through the pressure gauge connected to the ground surface through the touch pressure sensor. Step 5: Drainage treatment When the pressurized water flows into the water storage chamber, it is pumped out by the water pump at the upper end thereof. The lower end of the water pump is fixed by a pad, wherein the pad is welded to the upper end of the water storage chamber. The water pump is connected to the power controller through a multi-core conductive wire, so that the pressurized water is discharged through the drain pipe and finally reaches the sedimentation tank. The pressurized water in the sedimentation tank can be treated according to the situation. Step 6: Measure the deformation value of the bottom of the foundation pit Four strain gauges are arranged around the casing of the intelligent device for monitoring pressurized water inrush in super-large and super-deep foundation pits. A telescopic rod end cover is provided at the upper end. A gear is provided in the telescopic rod end cover to connect with the drill rod motor. The lower end of the telescopic rod end cover is connected with the telescopic rod. The strain gauge is connected with the multi-core conductive wire through the drill rod motor and can reach the designated measuring position. The lower end of the telescopic rod is connected with a spring to measure the small deformation of the strain gauge. A displacement sensor is provided around it and is connected with the display screen through the multi-core conductive wire. The operator observes the deformation value through the display screen.

2. The method for monitoring the sudden inrush of pressurized water during the excavation of a super-large and super-deep foundation pit according to claim 1, characterized in that: The device for monitoring the sudden surge of pressurized water in super-large and super-deep foundation pit excavation for implementing the method comprises a display screen, a power controller, a PVC pipe, a top cover, a drill rod motor, a telescopic rod end cover, a telescopic rod, a water pump, a pad, a pressurized water chamber, a small ball valve, a pipeline ball valve, a fixture, a water pressure sensor, a slider ball valve, a skateboard ball valve, a rolling ring, a skateboard, a channel pressure sensor, a hose, a touch pressure sensor, a strain gauge, a spring, a displacement sensor, a water storage chamber, a box shell, a sleeve, a drain pipe, a pressure gauge, a sedimentation tank, a fixed bracket and a retaining wall; The PVC pipe is located inside the foundation pit, and the device is inserted into the PVC pipe through a fixed bracket and a sleeve to monitor the change value of pressurized water; the top cover is located below the sleeve, and its lower end is welded to the box shell to fix the lower end of the drainage pipe; the drill rod motor is located at the outer end of the top cover, one end of which is welded to the top cover, and the lower end is welded to the box shell for the extension and retraction of the telescopic rod; the telescopic rod end cover is located at the upper end of the telescopic rod, and the lower end of the telescopic rod is hingedly connected to the spring and is arranged around the box shell; the water pump is located inside the box shell, the left side of which is connected to the drainage pipe, and the lower end is welded to the pad for pumping out pressurized water; the pressurized water chamber is located below the slide plate and reaches the water storage chamber through a hose; The small ball valve is located at the lower end of the pressurized water chamber, and is provided with three small ball valves, which are respectively arranged at the two ends and the middle position of the pressurized water chamber, and are used to observe the change of pressure value under small pressure conditions by the size of the opening of the small ball valve; the pipeline ball valve is located at the center of the eight-shaped groove at the bottom of the device, and its two ends are welded to the fixer, and are used to observe the change of pressure value under small pressure conditions by the size of the opening of the pipeline ball valve; the water pressure sensor is located at the upper end of the pipeline ball valve, and is connected to the pipeline by a sleeve connection, and is used to monitor the pressure value of the pressurized water in the pipeline; the slider ball valve is located around the pressurized water chamber, and is used to observe the change of pressure value under large pressure conditions by the size of the opening of the slider ball valve; the skateboard ball valve is located at the right end of the skateboard, and its lower end is connected to the pressurized water chamber, and is used to monitor the pressure change value of the pressurized water in the pressurized water chamber; the rolling ring is located at the outer end of the skateboard, and is connected to the pressurized water chamber by rolling The ball in the circle makes the slide plate move up and down; the slide plate is pushed to move by the change of the pressurized water in the pressurized water chamber, thereby contacting the touch pressure sensor at the upper end; the channel pressure sensor is located at the upper end of the slide plate, its left side is connected to the hose, and the lower end is welded to the slide plate, and is used to monitor the change value of the pressurized water pressure in the hose; the hose is located in the middle position between the slide plate and the water storage chamber, so that the pressurized water in the pressurized water chamber flows into the water storage chamber through the hose; the touch pressure sensor is located at the upper left end of the rolling circle, and is used to touch the upper touch pressure sensor by moving the slide plate upward, and the right end of the touch pressure sensor is connected to the pressure gauge through a multi-core conductive wire; the strain gauge is located at the lower end of the spring, and is welded to the spring, and is used to measure the bulge value of the pit bottom; the displacement sensor is located in the middle part of the telescopic rod and the strain gauge, so that the strain gauge reaches the position of the pit bottom; The box shell is located at the upper part of the device, and the sleeve is welded to the box shell so that the device can be lowered into the foundation pit through the sleeve; the lower end of the drainage pipe is connected to the water storage chamber, and the right end is connected to the sedimentation tank so that the pressurized water can be discharged through the drainage pipe; the left side of the sedimentation tank is connected to the drainage pipe.

3. The method for monitoring the sudden inrush of pressurized water during the excavation of a super-large and super-deep foundation pit according to claim 2, characterized in that: The device also includes a display screen and a power controller. The display screen is located at the upper end of the power controller, and its right end is connected to the power controller through a multi-core conductive line. The pit bottom uplift value can be seen through the display screen; the power controller is rectangular in shape, and a plurality of buttons are provided on its end face for power control of a drill rod motor, a water pump, a small ball valve, a pipeline ball valve, a water pressure sensor, a slider ball valve, a skateboard ball valve, a channel pressure sensor, a touch pressure sensor, a strain gauge, and a displacement sensor.

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