Deep foundation pit dewatering device and deep foundation pit dewatering method

Abstract

The invention relates to the technical field of foundation pit dewatering, and discloses a deep foundation pit dewatering device and a deep foundation pit dewatering method.The deep foundation pit dewatering device comprises a well pipe, a water pumping pipe and a central control device, the water pumping pipe is used for being inserted into the well pipe, and the central control device communicates with the water pumping pipe; the well pipe comprises main pipes and filtering devices, the main pipes and the filtering devices are alternately arranged in the axial direction of the well pipe, and the main pipes are detachably connected with the filtering devices; the well pipe further comprises a sealing plug which is used for sealing the main pipe when the filtering device is detached from the main pipe. During rainfall operation, each filtering device can filter silt carried in accumulated water in a layered manner, and underground water is filtered in a multi-layer filtering manner, so that the situation that the silt blocks a main pipe is reduced; after excavation of a first-layer foundation pit is completed, the main pipe and the filtering device which are exposed outside the foundation pit can be detached, and excavation operation of a next-layer foundation pit is not affected; segmented dewatering can be conducted on the foundation pit through the water pumping pipe, the water level can be detected after dewatering of each segment, and construction safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit dewatering, and in particular to a deep foundation pit dewatering device and a deep foundation pit dewatering method. Background Art

[0002] Foundation pit dewatering and groundwater monitoring are important technical measures to ensure the safety and smooth progress of the project during foundation pit excavation. As the excavation depth of foundation pits becomes deeper and the area becomes larger, the underground situation becomes more and more complicated, especially in water-rich areas. In order to ensure construction safety and quality and improve working conditions, dewatering must be carried out before excavation. In conventional methods, the water pump pumps the water in the soil into the reservoir without further processing the sediment in the water, which can easily cause problems such as blockage of the pumping pipe.

[0003] The patent with authorization announcement number CN214614149U discloses a treatment structure for dewatering a deep foundation pit on a soft soil foundation, including: a foundation pit, a pumping assembly, a well pipe and a filter assembly. The inner wall of the foundation pit is provided with a well pipe, and the filter assembly is fixedly installed on the inner wall of the well pipe. A pumping assembly is provided outside the foundation pit, and the pumping assembly extends to the interior of the filter assembly. The filter assembly also includes a circular ring frame, and the bottom of the circular ring frame is fixedly connected to a shaping frame. The outer wall of the shaping frame is covered with permeable concrete, and the top of the shaping frame is connected to a detachable fine sand filter.

[0004] The above-mentioned foundation pit dewatering structure uses a pumping assembly and a well pipe to connect and extract the accumulated water in the foundation pit, and uses a filter assembly on the inner wall of the bottom of the well pipe to filter out the sediment outside the foundation pit to prevent the sediment from clogging the well pipe during the pumping process. However, the excavation process of the foundation pit is carried out in sections. After excavating a certain depth of the foundation pit and extracting the corresponding accumulated water, the excavation continues. During the excavation process, the well pipe is always inserted in the foundation pit. The deeper the foundation pit is excavated, the higher the exposed well pipe is. The exposed well pipe affects the excavation progress of the lower foundation pit to a certain extent. Summary of the invention

[0005] The purpose of the present invention is to provide a deep foundation pit dewatering device to solve the problem in the prior art that the exposed well pipe affects the excavation progress of the lower foundation pit during foundation pit excavation; the present invention also provides a deep foundation pit dewatering method using the deep foundation pit dewatering device.

[0006] In order to achieve the above-mentioned object, the present invention provides a deep foundation pit dewatering device, comprising a well pipe, a pumping pipe and a central control device, wherein the pumping pipe is used to be inserted into the well pipe, and the central control device is connected to the pumping pipe to control the pumping operation;

[0007] The well pipe comprises a main pipe and a filtering device, the main pipe and the filtering device are alternately arranged along the axial direction of the well pipe, and the main pipe and the filtering device are detachably connected;

[0008] The well pipe further comprises a sealing plug for sealing the main pipe when the filtering device is removed from the main pipe.

[0009] Preferably, the filtering device comprises a filter screen, the filter screen forms a tubular structure with a through hole in the center, and connecting structures are formed at both axial ends of the filter screen, and the connecting structure is detachably connected to the main pipe.

[0010] Preferably, the connection structure is a threaded pipe with threads on the outer wall, threaded holes are respectively provided at two axial ends of the main pipe, and the filter device is threadedly assembled with the main pipe.

[0011] Preferably, one side of the sealing plug has an external thread, and the sealing plug is assembled with the main pipe thread.

[0012] Preferably, the water pumping pipe comprises a pipe body and a bottom filter, one end of the pipe body is connected to the central control device and the other end is inserted into the well pipe, and the bottom filter is assembled on the end of the pipe body inserted into the well pipe.

[0013] Preferably, the central control device includes a processing box, a water pump, a water pipe and a water pumping valve. The water pipe is installed in the processing box, and the water pipe connects the water pump and the water pumping pipe. The water pumping valve is installed on the water pipe. The water pump and the water pumping valve are both control-connected to the processing box, and the processing box is used to control the working status of the water pump and the water pumping valve.

[0014] Preferably, the central control device further comprises a detection connector and a water level light belt, and the detection connector and the water level display light belt are both control-connected to the processing box;

[0015] The deep foundation pit dewatering device also includes a water level detection device, which includes a wire loading tube, a sounding wire and a signal wire. The wire loading tube is inserted into the well pipe, and the sounding wire is assembled in the wire loading tube. One end of the signal wire is connected to the sounding wire and the other end is connected to the detection connector. The processing box is used to receive the water level signal detected by the sounding wire and control the water level light strip to display water level information.

[0016] Preferably, the sensing wire is bonded to the inner wall of the wire tube, there are at least two sensing wires, and the distance between the bottom end of each sensing wire and the bottom end of the wire tube is different.

[0017] The present invention also provides a deep foundation pit dewatering method, using the deep foundation pit dewatering device described in any of the above technical solutions, comprising the following steps:

[0018] S1, customize the total length of the well pipe according to the excavation depth of the foundation pit, assemble the main pipe and the filter device into the well pipe, drill a hole on the ground and put the assembled well pipe into it;

[0019] S2, inserting the pumping pipe into the well pipe, and starting the central control device to control the pumping pipe to pump water from the well pipe;

[0020] S3, take out the pumping pipe from the well pipe, connect the water level detection device to the detection connector of the central control device, use the water level detection device to detect the water level in the well pipe, if the water level meets the standard, proceed to step S4, otherwise repeat steps S2 and S3 until the water level meets the standard;

[0021] S4, turn out the well pipe at the top, install the sealing plug, and excavate the first foundation pit;

[0022] S5, remove the well pipe and the sealing plug exposed outside the foundation pit, and repeat steps S2 to S5 until the foundation pit excavation is completed.

[0023] Preferably, in step S3, the water level detection device transmits the water level signal to the central control device, and the central control device controls the display of different water level light strips according to the water level signal, and determines whether the water level meets the standard according to the water level light strips.

[0024] Compared with the prior art, the deep foundation pit dewatering device and deep foundation pit dewatering method according to the embodiment of the present invention have the following beneficial effects: the well pipe is composed of a main pipe and a filtering device. When performing dewatering operations, the filtering devices arranged alternately with the main pipe axial direction can filter out the silt carried from the accumulated water in layers, and filter the groundwater in a multi-layer filtering manner, thereby improving the filtering effect and reducing the situation where the main pipe is blocked by silt; at the same time, since the main pipe and the filtering device are detachably connected, when one layer of foundation pit is excavated, the main pipe and the filtering device exposed outside the foundation pit can be removed, which does not affect the excavation operation of the next layer of foundation pit, thereby improving the excavation efficiency of the foundation pit; in addition, since the filtering device and the main pipe are detachable, it is convenient to clean out the silt in the filtering device to prevent silt accumulation; at the same time, the foundation pit can be dewatered in sections through the pumping pipe, and the water level can be detected after each section of dewatering to ensure construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the deep foundation pit dewatering device of the present invention;

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure of the central control device of the deep foundation pit dewatering device;

[0027] Figure 3 yes Figure 2 A bottom view of the central control device;

[0028] Figure 4 yes Figure 1 A schematic diagram of the structure of the well pipe of the deep foundation pit dewatering device;

[0029] Figure 5 yes Figure 4 Schematic diagram of the explosion of the well pipe;

[0030] Figure 6 yes Figure 4 A top view of a filtering device for a well pipe;

[0031] Figure 7 It is a schematic diagram of the assembly of the water level detection device, the well pipe and the central control device of the deep foundation pit dewatering device of the present invention;

[0032] Figure 8 yes Figure 7 A top view of

[0033] Fig. 9 yes Figure 7 A schematic diagram of the structure of the wire pipe of the water level detection device;

[0034] Fig.10 yes Fig. 9 A schematic diagram of the internal structure of the wire tube;

[0035] Fig.11 It is a schematic flow diagram of the deep foundation pit dewatering method of the present invention.

[0036] In the figure, 1, well pipe, 11, main pipe, 12, filtering device, 121, filter screen, 122, threaded pipe, 13, sealing plug, 131, external thread, 2, pumping pipe, 21, pipe body, 22, bottom filter screen, 3, central control device, 31, processing box, 32, pumping pump, 33, water pipe, 34, pumping valve, 35, detection connector, 36, water level light strip, 4, water level detection device, 41, wiring pipe, 42, probe wire, 43, signal line, 44, detection hole. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] A preferred embodiment of a deep foundation pit dewatering device of the present invention is as follows: Figures 1 to 10 As shown, the deep foundation pit dewatering device includes a well pipe 1, a pumping pipe 2 and a central control device 3. The well pipe 1 is used to be inserted into a vertical hole drilled during dewatering to protect the vertical hole and connect the underground water for extraction; one end of the pumping pipe 2 is connected to the central control device 3, and the other end of the pumping pipe 2 is used to be inserted into the well pipe 1. The central control device 3 is the control center of the deep foundation pit dewatering device, and is used to control the pumping pipe 2 to extract the accumulated water from the well pipe 1.

[0039] The well pipe 1 includes a main pipe 11, a filter device 12 and a sealing plug 13. The main pipe 11 and the filter device 12 are alternately arranged along the axial direction of the well pipe 1, and the main pipe 11 and the filter device 12 are detachably connected. The main pipe 11 is the main structure of the well pipe 1. After the filter device 12 and the main pipe 11 are alternately arranged, each filter device 12 forms a multi-layer filtration for groundwater to reduce the sediment entering the well pipe 1. According to the excavation plan, the length of each main pipe 11 and the water wave of the filter device 12 can be customized. Since the main pipe 11 and the filter device 12 are detachable, after completing the precipitation operation of one layer of the foundation pit, the main pipe 11 and the filter device 12 can be disassembled to proceed to the next operation.

[0040] The sealing plug 13 is detachably connected to the main pipe 11. When the filter device 12 is removed from the main pipe 11, the sealing plug 13 can be assembled on the top of the main pipe 11 to seal the pipe opening of the well pipe 1 for the next operation. When water needs to be pumped, the sealing plug 13 can be removed from the main pipe 11, and the pumping pipe 2 can be inserted into the well pipe 1 from the pipe opening to perform the dewatering operation.

[0041] The well pipe 1 of the deep foundation pit dewatering device is composed of a main pipe 11 and a filtering device 12. When performing dewatering operations, the filtering devices 12 arranged axially alternately with the main pipe 11 can filter out the silt carried from the accumulated water in layers, and filter the groundwater in a multi-layer filtering manner, thereby improving the filtering effect and reducing the situation where the silt blocks the main pipe 11. At the same time, since the main pipe 11 and the filtering device 12 are detachably connected, when one layer of foundation pit is excavated, the main pipe 11 and the filtering device 12 exposed outside the foundation pit can be removed, which does not affect the excavation of the next layer of foundation pit, thereby improving the excavation efficiency of the foundation pit. In addition, since the filtering device 12 and the main pipe 11 are detachable, it is convenient to clean up the silt in the filtering device 12 to prevent silt accumulation. At the same time, the foundation pit can be dewatered in sections through the pumping pipe 2, and the water level can be detected after each section of dewatering to ensure construction safety.

[0042] Preferably, the filter device 12 includes a filter screen 121 , which is a tubular structure with a through hole in the center. Both axial ends of the filter screen 121 are formed with connecting structures, which are detachably connected to the main pipe 11 .

[0043] The filter device 12 is formed by a filter screen 121, which is surrounded by a tubular structure with a through hole in the center, simplifying the structure of the filter device 12. After the filter screen 121 is surrounded by a tubular structure, the filter screen 121 is wrapped in multiple layers to improve the filtering effect. A connection structure is directly provided at both axial ends of the filter screen 121, omitting the structure of adding a pipeline in the center of the filter screen 121, and the filtering effect is good.

[0044] Preferably, the connection structure is a threaded pipe 122 with threads on the outer wall, threaded holes are respectively provided at two axial ends of the main pipe 11 , and the filter device 12 is threadedly assembled with the main pipe 11 .

[0045] The connection structure adopts a threaded pipe 122, and the main pipe 11 and the filter device 12 are threadedly assembled. The threaded connection structure is convenient for disassembly and can also increase the sealing between the filter device 12 and the main pipe 11. In other embodiments, the connection structure can also be a flange.

[0046] Preferably, one side of the sealing plug 13 has an external thread 131 , and the sealing plug 13 is threadably assembled with the main pipe 11 .

[0047] The sealing plug 13 is threadedly assembled with the main pipe 11 through the external thread 131. The threaded hole on the main pipe 11 is a common structure for the sealing plug 13 and the connection structure. There is no need to set up an additional assembly structure with the sealing plug 13, which is convenient for processing.

[0048] Preferably, the water pumping pipe 2 includes a pipe body 21 and a bottom filter 22 , one end of the pipe body 21 is connected to the central control device 3 and the other end is inserted into the well pipe 1 , and the bottom filter 22 is assembled on the end of the pipe body 21 inserted into the well pipe 1 .

[0049] One end of the pipe body 21 of the water pumping pipe 2 inserted into the well pipe 1 is equipped with a bottom filter 22. When the water level drops during the pumping process, it is filtered by the bottom filter 22, which can further prevent mud and sand from entering the water pumping pipe 2 and causing blockage.

[0050] Preferably, the central control device 3 includes a processing box 31, a water pump 32, a water pipe 33 and a water pumping valve 34. The water pipe 33 is installed in the processing box 31, and the water pipe 33 connects the water pump 32 and the water pumping pipe 2. The water pumping valve 34 is installed on the water pipe 33. The water pump 32 and the water pumping valve 34 are both control-connected to the processing box 31. The processing box 31 is used to control the working status of the water pump 32 and the water pumping valve 34.

[0051] The central control device 3 is the core structure of precipitation and monitoring. The processing box 31 is the control center of the central control device 3, which can receive and process water level information and control the operation of the pumping pump 32 and the pumping valve 34. The pumping pump 32 is connected to the pumping pipe 2 through the water pipe 33. The pumping pump 32 provides power for the pumping operation. The water pipe 33 is equipped with a pumping valve 34. The processing box 31 adjusts the pumping valve 34 to open or close, and can control the start and stop of the water pipe 33. In this embodiment, the processing box 31 is equipped with multiple water pipes 33, and each water pipe 33 is equipped with a pumping valve 34. The processing box 31 controls each water pipe 33 separately by adjusting the state of different pumping valves 34.

[0052] Preferably, the central control device 3 also includes a detection connector 35 and a water level light strip 36, and the detection connector 35 and the water level display light strip are all controlled and connected to the processing box 31; the deep foundation pit dewatering device also includes a water level detection device 4, the water level detection device 4 includes a wiring tube 41, a sounding wire 42 and a signal line 43, the wiring tube 41 is inserted into the well pipe 1, the sounding wire 42 is assembled in the wiring tube 41, one end of the signal line 43 is connected to the sounding wire 42, and the other end is connected to the detection connector 35, and the processing box 31 is used to receive the water level signal detected by the sounding wire 42 and control the water level light strip 36 to display the water level information.

[0053] The water level detection device 4 is used to detect the water level in the well pipe 1 after the pumping pipe 2 pumps water. The wiring tube 41 is made of waterproof and anti-corrosion material. The probe wire 42 is assembled in the wiring tube 41. The wiring tube 41 protects the probe wire 42 and extends the service life of the water level detection device 4. The signal line 43 is used to transmit the water level information detected by the probe wire 42 to the processing box 31 via the detection connector 35, so that the processing box 31 can judge and display the water level information.

[0054] In this embodiment, each detection connector 35 corresponds to two water level light strips 36. According to different water level information, the processing box 31 controls different water level light strips 36 to display, so that personnel can judge whether the water level reaches the set water level.

[0055] In this embodiment, the end of the probe wire 42 is connected to a conventional water level gauge probe, and the wiring tube 41 has a detection hole 44 at the position of the water level gauge probe, and the detection hole 44 runs through the wiring tube 41 for the water level gauge probe to obtain water level information. The length of the probe wire 42 and the position of the detection hole 44 on the wiring tube 41 can be designed according to the monitoring height required by the project.

[0056] Preferably, the sensing wires 42 are bonded to the inner wall of the wire tube 41 , there are at least two sensing wires 42 , and the distances between the bottom ends of the sensing wires 42 and the bottom end of the wire tube 41 are different.

[0057] The feeler wire 42 is bonded to the inner wall of the wire tube 41, and the feeler wire 42 is fixed to the wire tube 41 to prevent the feeler wire 42 from shaking in the wire tube 41 and affecting the position of the water level gauge probe at the bottom thereof, thereby ensuring accurate water level detection. There are at least two feeler wires 42, and the distance between the bottom end of the feeler wire 42 and the bottom end of the wire tube 41 is different, so that the height of the water level gauge probe on each feeler wire 42 is different. Different feeler wires 42 can detect water levels at different heights. Through the water level information detected by different feeler wires 42, the processing box 31 can determine between which two water level gauge probes at the bottom of the feeler wires 42 the water level is, thereby obtaining specific water level information and improving the accuracy of the water level detection result.

[0058] The present invention also provides a preferred embodiment of a deep foundation pit dewatering method, using a deep foundation pit dewatering device according to any of the above technical solutions, such as Fig.11 As shown, the following steps are included:

[0059] S1, customize the total length of the well pipe 1 according to the excavation depth of the foundation pit, assemble the main pipe 11 and the filtering device 12 into the well pipe 1, drill a hole on the ground and put the assembled well pipe 1 into it.

[0060] S2, insert the water pumping pipe 2 into the well pipe 1, and start the central control device 3 to control the water pumping pipe 2 to pump water from the well pipe 1.

[0061] S3, take out the pumping pipe 2 from the well pipe 1, connect the water level detection device 4 to the detection connector 35 of the central control device 3, use the water level detection device 4 to detect the water level in the well pipe 1, if the water level meets the standard, proceed to step S4, otherwise repeat steps S2 and S3 until the water level meets the standard.

[0062] S4, the well pipe 1 at the top is rotated out, the sealing plug 13 is installed, and the first layer of foundation pit is excavated.

[0063] S5, remove the well pipe 1 and the sealing plug 13 exposed outside the foundation pit, and repeat steps S2 to S5 until the excavation of the foundation pit is completed.

[0064] In step S1, after the well pipe 1 is placed, clay is used to seal the area around the well pipe 1. When performing the dewatering operation, the deep foundation pit dewatering method repeats steps S2 and S3, and the excavation of the foundation pit layer to be excavated is performed only after the accumulated water within the depth range of the foundation pit to be excavated reaches the standard. The water level detection device 4 can monitor the depth of the accumulated water in the well pipe 1 in real time, so that the construction personnel can accurately grasp the height of the groundwater level during the dewatering process to ensure the safety of the operation.

[0065] After one layer of foundation pit excavation is completed, steps S2 to S5 are repeated. After each layer of foundation pit excavation, the well pipe 1 exposed outside the foundation pit can be removed without affecting the excavation process of the next layer of foundation pit, thereby improving the excavation efficiency of the foundation pit. At the same time, the foundation pit can be dewatered in sections through the pumping pipe 2, and the water level can be detected after each section of dewatering to ensure construction safety.

[0066] Preferably, in step S3 , the water level detection device 4 transmits the water level signal to the central control device 3 , and the central control device 3 controls the display of different water level light strips 36 according to the water level signal, and determines whether the water level reaches the standard according to the water level light strips 36 .

[0067] Each detection connector 35 corresponds to a plurality of water level light strips 36. The processing box 31 controls different water level light strips 36 to display whether the water level meets the standard. The construction personnel can accurately obtain the water level information through the displayed water level light strips 36. In other embodiments, the water level light strips 36 can also display different colors for the construction personnel to judge whether the water level meets the standard.

[0068] In summary, the embodiments of the present invention provide a deep foundation pit dewatering device and a deep foundation pit dewatering method, wherein the well pipe is composed of a main pipe and a filtering device. When performing dewatering operations, the filtering devices arranged alternately with the main pipe axially can filter out the silt carried from the accumulated water in layers, and filter the groundwater in a multi-layer filtering manner, thereby improving the filtering effect and reducing the situation where the main pipe is blocked by silt. At the same time, since the main pipe and the filtering device are detachably connected, when one layer of foundation pit is excavated, the main pipe and the filtering device exposed outside the foundation pit can be removed, which does not affect the excavation operation of the next layer of foundation pit, thereby improving the excavation efficiency of the foundation pit. In addition, since the filtering device and the main pipe are detachable, it is convenient to clean up the silt in the filtering device to prevent silt accumulation. At the same time, the foundation pit can be dewatered in sections through the pumping pipe, and the water level can be detected after each section of dewatering to ensure construction safety.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A deep foundation pit dewatering device, characterized in that: It comprises a well pipe (1), a water pumping pipe (2) and a central control device (3), wherein the water pumping pipe (2) is used to be inserted into the well pipe (1), and the central control device (3) is connected to the water pumping pipe (2) to control the water pumping operation; The well pipe (1) comprises a main pipe (11) and a filtering device (12), wherein the main pipe (11) and the filtering device (12) are alternately arranged along the axial direction of the well pipe (1), and the main pipe (11) and the filtering device (12) are detachably connected; The well pipe (1) further comprises a sealing plug (13), wherein the sealing plug (13) is used to seal the main pipe (11) when the filtering device (12) is removed from the main pipe (11).

2. The deep foundation pit dewatering device according to claim 1, characterized in that: The filtering device (12) comprises a filtering screen (121), the filtering screen (121) forming a tubular structure with a through hole at the center, and connecting structures formed at both axial ends of the filtering screen (121), the connecting structures being detachably connected to the main pipe (11).

3. The deep foundation pit dewatering device according to claim 2, characterized in that: The connection structure is a threaded pipe (122) with a threaded outer wall, threaded holes are respectively provided at two axial ends of the main pipe (11), and the filter device (12) is threadedly assembled with the main pipe (11).

4. The deep foundation pit dewatering device according to claim 3, characterized in that: One side of the sealing plug (13) has an external thread (131), and the sealing plug (13) is threadably assembled with the main pipe (11).

5. The deep foundation pit dewatering device according to any one of claims 1 to 4, characterized in that: The water pumping pipe (2) comprises a pipe body (21) and a bottom filter (22); one end of the pipe body (21) is connected to the central control device (3) and the other end is inserted into the well pipe (1); the bottom filter (22) is assembled on the end of the pipe body (21) inserted into the well pipe (1).

6. The deep foundation pit dewatering device according to any one of claims 1 to 4, characterized in that: The central control device (3) comprises a processing box (31), a water pump (32), a water pipe (33) and a water pumping valve (34); the water pipe (33) is installed in the processing box (31), and the water pipe (33) connects the water pump (32) and the water pumping pipe (2); the water pumping valve (34) is installed on the water pipe (33); the water pump (32) and the water pumping valve (34) are both controllably connected to the processing box (31); the processing box (31) is used to control the working states of the water pump (32) and the water pumping valve (34).

7. The deep foundation pit dewatering device according to claim 6, characterized in that: The central control device (3) further comprises a detection connector (35) and a water level display light strip (36), and the detection connector (35) and the water level display light strip are both controllably connected to the processing box (31); The deep foundation pit dewatering device also includes a water level detection device (4), which includes a wire tube (41), a feeler wire (42) and a signal wire (43). The wire tube (41) is inserted into the well pipe (1), the feeler wire (42) is installed in the wire tube (41), one end of the signal wire (43) is connected to the feeler wire (42), and the other end is connected to the detection connector (35). The processing box (31) is used to receive the water level signal detected by the feeler wire (42) and control the water level light strip (36) to display water level information.

8. The deep foundation pit dewatering device according to claim 7, characterized in that: The sensing wire (42) is bonded to the inner wall of the wire tube (41), there are at least two sensing wires (42), and the distance between the bottom end of each sensing wire (42) and the bottom end of the wire tube (41) is different.

9. A deep foundation pit dewatering method, characterized in that: Using the deep foundation pit dewatering device according to any one of claims 1 to 8, The following steps are involved: S1, customizing the total length of the well pipe (1) according to the excavation depth of the foundation pit, assembling the main pipe (11) and the filtering device (12) into the well pipe (1), drilling a hole on the ground and placing the assembled well pipe (1); S2, inserting the pumping pipe (2) into the well pipe (1), and starting the central control device (3) to control the pumping pipe (2) to pump water from the well pipe (1); S3, taking out the water pumping pipe (2) from the well pipe (1), connecting the water level detection device (4) to the detection connector (35) of the central control device (3), and using the water level detection device (4) to detect the water level in the well pipe (1). If the water level meets the standard, proceed to step S4, otherwise, repeat steps S2 and S3 until the water level meets the standard; S4, the well pipe (1) at the top is rotated out, the sealing plug (13) is installed, and the first foundation pit is excavated; S5, remove the well pipe (1) and the sealing plug (13) exposed outside the foundation pit, and repeat steps S2 to S5 until the foundation pit excavation is completed.

10. The deep foundation pit dewatering method according to claim 9, characterized in that: In step S3, the water level detection device (4) transmits the water level signal to the central control device (3), and the central control device (3) controls the display of different water level light strips (36) according to the water level signal, and determines whether the water level meets the standard according to the water level light strips (36).

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