A dewatering device for sand foundation pit

Abstract

The present invention discloses a dewatering device for a foundation pit on a sandy soil foundation, comprising a water pump located at the top edge of the foundation pit, a water pipe connected to the water pump and located in the foundation pit, a fixing mechanism for stabilizing the surface of the foundation pit, and a fixing mechanism for supporting the water pump and fixing the water pipe. The fixing mechanism is provided with a water level linkage mechanism for linking the water level of the foundation pit with the working state of the water pump. The setting of the fixing mechanism of the present invention ensures the stability of the foundation pit, the setting of the supporting mechanism facilitates the fixing of the water pump and the water pipe, and the setting of the water level linkage mechanism facilitates the monitoring of the water level in the foundation pit and the control of the working state of the water pump at the same time, so as to avoid safety accidents such as excessive settlement of the surrounding area caused by excessive groundwater extraction.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a dewatering device for a foundation pit of a sandy soil foundation. Background Art

[0002] In recent years, with the continuous development and utilization of underground space, a large number of super-large deep foundation pit projects have emerged. In order to protect the safety of nearby buildings, roads and municipal pipe networks around the foundation pit, the requirements for deep foundation pit construction technology are getting higher and higher, especially when excavating foundation pits in strata with high groundwater levels and strong permeability. The safety, convenience and economy of foundation pit dewatering construction are highly valued by engineering and technical personnel. In the existing technology, water pipes are set at the bottom of the foundation pit for drainage, but the water pipes are not firmly fixed and are easily displaced during the construction process, resulting in unstable position. The ground settlement corresponds to the groundwater level drop. The curved surface distribution of the groundwater level drop will inevitably cause uneven settlement of neighboring buildings. Therefore, the existing foundation pit dewatering needs to be inspected on-site and calculated carefully, and special personnel need to be arranged to check the pumping situation of the water pump in turn during the whole process of pumping. The existing foundation pit dewatering device does not have a foundation pit water level monitoring device, and workers need to check the foundation pit water level specifically. If the workers are negligent for a while, it may cause excessive groundwater extraction, causing safety accidents such as excessive settlement of the surrounding area.

[0003] Therefore, a dewatering device for a foundation pit on a sandy soil foundation is provided, which is convenient for fixing a water pipe and links the foundation pit water level with the working state of a water pump. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a dewatering device for a foundation pit on a sandy soil foundation, which is convenient for fixing a water pipe and links the foundation pit water level with the working state of a water pump.

[0005] The object of the present invention is achieved in that:

[0006] A dewatering device for a foundation pit on a sandy soil foundation comprises a water pump located at the top edge of the foundation pit, a water pipe connected to the water pump and located in the foundation pit, a fixing mechanism for stabilizing the surface of the foundation pit, and a fixing mechanism for supporting the water pump and fixing the water pipe. The fixing mechanism is provided with a water level linkage mechanism for linking the water level of the foundation pit with the working state of the water pump. The water level linkage mechanism comprises a shell fixed to the fixing mechanism, a accommodating chamber located in the shell, a buoy movably connected to the side wall of the accommodating chamber through a sliding mechanism, a connecting mechanism fixedly connected to the top of the buoy, a second limit plate located above the buoy, a first limit plate located above the second limit plate, an induction switch fixedly connected to the first limit plate and the connecting mechanism, and an extrusion switch fixedly connected to the second limit plate and the connecting mechanism. The induction switch is connected in parallel with the extrusion switch, the induction switch is connected in series with the water pump and a power supply, and the extrusion switch is connected in series with the water pump and the power supply.

[0007] The lower part of the shell is provided with a plurality of water inlet holes, and the connecting mechanism comprises a connecting rod fixedly connected to the top of the buoy and passing through the second limiting plate, and a connecting plate fixedly connected to the top of the connecting rod, and the connecting rod passes through the second limiting plate and moves in the vertical direction.

[0008] The extrusion switch includes an isolation plate fixedly connected to the lower surface of the connecting plate, a conductive mechanism fixedly connected to the lower surface of the second limiting plate, the conductive mechanism includes a fixing seat fixedly connected to the lower surface of the second limiting plate, a mounting cavity located in the fixing seat, a first terminal fixedly connected to the bottom of the mounting cavity, a second terminal, a first fixing plate fixedly connected to the top of the first terminal, and a second fixing plate fixedly connected to the top of the second terminal, a first wedge-shaped tip is provided at the left end of the first fixing plate, a spring is provided at the right end of the second fixing plate, a second wedge-shaped tip is provided at the right end of the spring, the position of the first wedge-shaped tip corresponds to the position of the second wedge-shaped tip, a third wedge-shaped tip is provided at the bottom of the isolation plate, the third wedge-shaped tip is located between the first wedge-shaped tip and the second wedge-shaped tip, the isolation plate passes through the fixing seat and moves in the mounting cavity, and the first terminal and the second terminal are connected in series with a power supply and a water pump through wires.

[0009] The right end of the second fixing plate is provided with a receiving groove opening to the right, a spring is fixedly connected in the receiving groove, and the left end of the elastic plate is fixedly connected in the receiving groove through the spring.

[0010] The sliding mechanism includes a slider fixedly connected to the outer surface of the float, and a slide groove located on the surface of the accommodating cavity and cooperating with the slider. The length direction of the slide groove is the vertical direction, and the float moves in the vertical direction through the cooperation of the slider and the slide groove.

[0011] The supporting mechanism includes a plurality of supporting piles fixedly connected to the surface of the foundation pit and in a vertical direction, a supporting column connected to two adjacent supporting piles and in a horizontal direction, and a supporting plate fixedly connected to the top of the supporting piles and located outside the foundation pit, and a water pump fixedly connected to the upper surface of the supporting plate.

[0012] The fixing mechanism comprises a steel cage fixedly connected to the support column, and the water pipe and the shell are both fixedly connected to the steel cage.

[0013] A cover body is provided on the top of the accommodating cavity, and the cover body is threadedly connected to the outer surface of the shell.

[0014] The first limiting plate is fixedly connected to the side wall of the accommodating cavity through a placement mechanism. Several placement mechanisms are arranged at equal intervals in the vertical direction. The placement mechanism includes a first placement groove located on the left side of the accommodating cavity and opening to the right, a second placement groove located on the right side of the accommodating cavity and opening to the left, and springs located in the first placement groove and the second placement groove.

[0015] Positive and beneficial effects: The setting of the fixing mechanism of the present invention ensures the stability of the foundation pit, the setting of the supporting mechanism facilitates the fixation of the water pump and the water pipe, and the setting of the water level linkage mechanism facilitates the monitoring of the water level in the foundation pit and controls the working state of the water pump at the same time, avoiding safety accidents such as excessive settlement of the surrounding area caused by excessive groundwater extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the water level linkage mechanism of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the squeeze switch of the present invention;

[0019] Figure 4 A circuit diagram of the induction switch, squeeze switch and water pump of the present invention;

[0020] The figure shows: foundation pit 1, supporting piles 2, supporting columns 3, steel cage 4, supporting plate 5, water pump 6, water pipe 7, water level linkage mechanism 8, shell 9, accommodating chamber 10, buoy 11, connecting rod 12, connecting plate 13, second limit plate 14, first touch 15, induction plate 16, first limit plate 17, isolation plate 18, conductive mechanism 19, water inlet hole 20, first placement groove 21, second placement groove 22, spring 23, cover 24, slider 25, slide groove 26, fixing seat 27, installation chamber 28, first terminal 29, second terminal 30, first fixing plate 31, second fixing plate 32, spring 33, first wedge-shaped tip 34, second wedge-shaped simple 35, third wedge-shaped tip 36. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Example 1

[0023] like Figure 1As shown, a dewatering device for a foundation pit of sandy soil includes a water pump 6 located at the top edge of a foundation pit 1, a water pipe 7 connected to the water pump 6 and located in the foundation pit, and also includes a fixing mechanism for stabilizing the surface of the foundation pit 1, a fixing mechanism for supporting the water pump 6 and fixing the water pipe 7, and the fixing mechanism is provided with a water level linkage mechanism 8 for linking the water level of the foundation pit 1 and the working state of the water pump 6, and the supporting mechanism includes a plurality of supporting piles 2 fixedly connected to the surface of the foundation pit 1 and in a vertical direction, a supporting column 3 connected to two adjacent supporting piles 2 and in a horizontal direction, and a supporting plate 5 fixedly connected to the top of the supporting pile 2 and located outside the foundation pit 1, and the water pump 6 is fixedly connected to the upper surface of the supporting plate 5. The fixing mechanism includes a steel bar 4 fixedly connected to the supporting column 3, and the water pipe 7 can be fixedly connected to the steel cage 4 by a clamp, and the plurality of supporting piles 2 and supporting columns 3 are convenient for fixing the surface of the foundation pit 1, providing a guarantee for the dewatering work, and the setting of the steel cage 4 fixes the water pipe 7 to the steel cage 4 to prevent the water pipe 7 from shaking and being damaged.

[0024] like Figure 2As shown, the water level linkage mechanism 8 includes a shell fixed to the steel cage 4, a accommodating chamber 10 located in the shell 9, a buoy 11 movably connected to the side wall of the accommodating chamber 10 through a sliding mechanism, a connecting mechanism fixedly connected to the top of the buoy 11, a second limit plate 14 located above the buoy 11, a first limit plate 17 located above the second limit plate 14, an inductive switch fixedly connected to the first limit plate 17 and the connecting mechanism, an extrusion switch fixedly connected to the second limit plate 14 and the connecting mechanism, the inductive switch 15 is connected in parallel with the extrusion switch, the inductive switch 15 is connected in series with the water pump 6 and the power supply, and the extrusion switch is connected in series with the water pump 6 and the power supply to avoid damage to the inductive switch and failure to drain water. The top of the connecting mechanism is provided with a sensing sheet 16 that cooperates with the sensing switch. The sensing distance of the sensing switch 15 is the distance between the first limit plate 17 and the second limit plate 14. When the sensing switch 15 or the extrusion switch is closed, the water pump 6 starts to work. When the water level in the foundation pit 1 makes the top of the connecting mechanism reach the position between the first limit plate 17 and the second limit plate 15, the sensing switch 15 is closed, and the water pump 6 starts to pump water. When the water level in the foundation pit makes the top of the connecting mechanism reach the position of the second limit plate 14, the sensing switch 15 is disconnected, and the water pump 6 stops working. The buoy 11 adopts a sealed cylindrical plastic tank, which increases the contact area with water and makes the buoyancy of the buoy 11 greater. A plurality of water inlet holes 20 are provided at the lower portion of the shell 9 to facilitate the water in the foundation pit 1 to enter the accommodating chamber 10 while preventing sand and gravel from entering the accommodating chamber 10. The connecting mechanism includes a connecting rod 12 fixedly connected to the top of the buoy 11 and passing through the second limit plate 14, and a connecting plate 13 fixedly connected to the top of the connecting rod 12. The connecting rod 12 passes through the second limit plate 14 and moves in the vertical direction. The bottom of the connecting rod 12 is adhered to the top of the buoy 11 by adhesive, and the top of the connecting rod 12 is adhered and fixed to the lower surface of the connecting plate 13 by adhesive. When the water level in the foundation pit 1 rises, the buoy 11 rises, and the buoy 11 drives the connecting rod 12 and the connecting plate 13 to rise, and the induction switch 15 is turned on.

[0025] like Figure 3 and Figure 4As shown, the squeeze switch includes an isolating sheet 18 fixedly connected to the lower surface of the connecting plate 13, and a conductive mechanism 19 fixedly connected to the lower surface of the second limiting plate 14. The isolating sheet 18 is made of non-conductive material, and the top of the isolating sheet 18 is fixed to the lower surface of the connecting plate 13 by adhesive. The conductive mechanism 19 includes a fixing seat 27 fixedly connected to the lower surface of the second limiting plate 14, a mounting cavity 28 located in the fixing seat 27, a first terminal 29 fixedly connected to the bottom of the mounting cavity 28, a second terminal 30, a first fixing sheet 31 fixedly connected to the top of the first terminal 29, and a fixing sheet 32 ​​fixedly connected to the top of the second terminal 30. The first fixing plate 31 is fixedly connected to the second fixing plate 32, the left end of the first fixing plate 31 is provided with a first wedge-shaped tip 34, the right end of the second fixing plate 32 is provided with a spring 33, the right end of the spring 33 is provided with a second wedge-shaped tip 35, the position of the first wedge-shaped tip 34 corresponds to the position of the second wedge-shaped tip 35, the bottom of the isolation plate 18 is provided with a third wedge-shaped tip 36, the third wedge-shaped tip 36 is located just above the connection between the first wedge-shaped tip 34 and the second wedge-shaped tip 35, the bottom of the isolation plate 18 passes through the fixing seat 27 and moves in the installation cavity 28, the first terminal 29 and the second terminal 30 are connected in series with the power supply and the water pump 6 through wires. The right end of the second fixing plate 32 is provided with a receiving groove opening to the right, a spring is fixed in the receiving groove, the left end of the spring 33 is fixedly connected in the receiving groove through the spring, the first wedge-shaped tip 34 and the second wedge-shaped tip 35 are in contact, and the first terminal 29 and the second terminal 30 are connected.

[0026] The sliding mechanism includes a slider 25 fixedly connected to the outer surface of the float 11, and a slide groove 26 located on the surface of the accommodating cavity 10 and cooperating with the slider 25. The length direction of the slide groove 26 is the vertical direction. The float 11 moves in the vertical direction through the cooperation of the slider 25 and the slide groove 26, which facilitates the vertical movement of the float 11, thereby turning on or off the induction switch and the extrusion switch.

[0027] When the water level in the foundation pit rises, the buoy 11 moves upward, and the buoy 11 drives the connecting rod 12 and the connecting plate 13 to move upward together, then the induction switch 15 is conductive, and the water pump 6 starts to work. If the induction switch 15 is damaged and cannot work, when the water in the foundation pit 1 continues to rise, the isolation plate 18 moves upward until the connecting plate 13 contacts the lower surface of the first limit plate 17. At this time, the third wedge-shaped tip 36 leaves the first wedge-shaped tip 34 and the second wedge-shaped tip 35, and the first wedge-shaped tip 34 and the second wedge-shaped tip 35 are connected, that is, the first terminal 29 and the second terminal 30 are connected, then the water pump 6 starts to work, the water level in the foundation pit 1 drops, and the buoy 11 drives the connecting rod 12 and the connecting plate 13 to move downward, then the third wedge-shaped tip 36 moves downward, separating the first wedge-shaped tip 34 and the second wedge-shaped tip 35, and the water pump 6 stops working.

[0028] Example 2

[0029] like Figure 1 As shown, a dewatering device for a foundation pit of sandy soil includes a water pump 6 located at the top edge of a foundation pit 1, a water pipe 7 connected to the water pump 6 and located in the foundation pit, and also includes a fixing mechanism for stabilizing the surface of the foundation pit 1, a fixing mechanism for supporting the water pump 6 and fixing the water pipe 7, and the fixing mechanism is provided with a water level linkage mechanism 8 for linking the water level of the foundation pit 1 and the working state of the water pump 6, and the supporting mechanism includes a plurality of supporting piles 2 fixedly connected to the surface of the foundation pit 1 and in a vertical direction, a supporting column 3 connected to two adjacent supporting piles 2 and in a horizontal direction, and a supporting plate 5 fixedly connected to the top of the supporting pile 2 and located outside the foundation pit 1, and the water pump 6 is fixedly connected to the upper surface of the supporting plate 5. The fixing mechanism includes a steel bar 4 fixedly connected to the supporting column 3, and the water pipe 7 can be fixedly connected to the steel cage 4 by a clamp, and the plurality of supporting piles 2 and supporting columns 3 are convenient for fixing the surface of the foundation pit 1, providing a guarantee for the dewatering work, and the setting of the steel cage 4 fixes the water pipe 7 to the steel cage 4 to prevent the water pipe 7 from shaking and being damaged.

[0030] like Figure 2As shown, the water level linkage mechanism 8 includes a shell fixed to the steel cage 4, a accommodating chamber 10 located in the shell 9, a buoy 11 movably connected to the side wall of the accommodating chamber 10 through a sliding mechanism, a connecting mechanism fixedly connected to the top of the buoy 11, a second limit plate 14 located above the buoy 11, a first limit plate 17 located above the second limit plate 14, an inductive switch fixedly connected to the first limit plate 17 and the connecting mechanism, an extrusion switch fixedly connected to the second limit plate 14 and the connecting mechanism, the inductive switch 15 is connected in parallel with the extrusion switch, the inductive switch 15 is connected in series with the water pump 6 and the power supply, and the extrusion switch is connected in series with the water pump 6 and the power supply to avoid damage to the inductive switch and failure to drain water. The top of the connecting mechanism is provided with a sensing sheet 16 that cooperates with the sensing switch. The sensing distance of the sensing switch 15 is the distance between the first limit plate 17 and the second limit plate 14. When the sensing switch 15 or the extrusion switch is closed, the water pump 6 starts to work. When the water level in the foundation pit 1 makes the top of the connecting mechanism reach the position between the first limit plate 17 and the second limit plate 15, the sensing switch 15 is closed, and the water pump 6 starts to pump water. When the water level in the foundation pit makes the top of the connecting mechanism reach the position of the second limit plate 14, the sensing switch 15 is disconnected, and the water pump 6 stops working. The buoy 11 adopts a sealed cylindrical plastic tank, which increases the contact area with water and makes the buoyancy of the buoy 11 greater. A plurality of water inlet holes 20 are provided at the lower portion of the shell 9 to facilitate the water in the foundation pit 1 to enter the accommodating chamber 10 while preventing sand and gravel from entering the accommodating chamber 10. The connecting mechanism includes a connecting rod 12 fixedly connected to the top of the buoy 11 and passing through the second limit plate 14, and a connecting plate 13 fixedly connected to the top of the connecting rod 12. The connecting rod 12 passes through the second limit plate 14 and moves in the vertical direction. The bottom of the connecting rod 12 is adhered to the top of the buoy 11 by adhesive, and the top of the connecting rod 12 is adhered and fixed to the lower surface of the connecting plate 13 by adhesive. When the water level in the foundation pit 1 rises, the buoy 11 rises, and the buoy 11 drives the connecting rod 12 and the connecting plate 13 to rise, and the induction switch 15 is turned on.

[0031] like Figure 3 and Figure 4As shown, the squeeze switch includes an isolating sheet 18 fixedly connected to the lower surface of the connecting plate 13, and a conductive mechanism 19 fixedly connected to the lower surface of the second limiting plate 14. The isolating sheet 18 is made of non-conductive material, and the top of the isolating sheet 18 is fixed to the lower surface of the connecting plate 13 by adhesive. The conductive mechanism 19 includes a fixing seat 27 fixedly connected to the lower surface of the second limiting plate 14, a mounting cavity 28 located in the fixing seat 27, a first terminal 29 fixedly connected to the bottom of the mounting cavity 28, a second terminal 30, a first fixing sheet 31 fixedly connected to the top of the first terminal 29, and a fixing sheet 32 ​​fixedly connected to the top of the second terminal 30. The first fixing plate 31 is fixedly connected to the second fixing plate 32, the left end of the first fixing plate 31 is provided with a first wedge-shaped tip 34, the right end of the second fixing plate 32 is provided with a spring 33, the right end of the spring 33 is provided with a second wedge-shaped tip 35, the position of the first wedge-shaped tip 34 corresponds to the position of the second wedge-shaped tip 35, the bottom of the isolation plate 18 is provided with a third wedge-shaped tip 36, the third wedge-shaped tip 36 is located just above the connection between the first wedge-shaped tip 34 and the second wedge-shaped tip 35, the bottom of the isolation plate 18 passes through the fixing seat 27 and moves in the installation cavity 28, the first terminal 29 and the second terminal 30 are connected in series with the power supply and the water pump 6 through wires. The right end of the second fixing plate 32 is provided with a receiving groove opening to the right, a spring is fixed in the receiving groove, the left end of the spring 33 is fixedly connected in the receiving groove through the spring, the first wedge-shaped tip 34 and the second wedge-shaped tip 35 are in contact, and the first terminal 29 and the second terminal 30 are connected.

[0032] The sliding mechanism includes a slider 25 fixedly connected to the outer surface of the float 11, and a slide groove 26 located on the surface of the accommodating cavity 10 and cooperating with the slider 25. The length direction of the slide groove 26 is the vertical direction. The float 11 moves in the vertical direction through the cooperation of the slider 25 and the slide groove 26, which facilitates the vertical movement of the float 11, thereby turning on or off the induction switch and the extrusion switch.

[0033] like Figure 2 As shown, a cover 24 is provided on the top of the accommodating chamber 10, and the cover 24 is threadedly connected to the outer surface of the shell 9 to prevent water from entering from the top of the accommodating chamber 10. The first limit plate 17 is fixedly connected to the side wall of the accommodating chamber 10 through a placement mechanism, and a plurality of placement mechanisms are arranged at equal intervals in the vertical direction. The placement mechanism includes a first placement groove 21 located on the left side of the accommodating chamber 10 and opening to the right, a second placement groove 22 located on the right side of the accommodating chamber 10 and opening to the left, and a spring 23 located in the first placement groove 21 and the second placement groove 22. The placement mechanism can be set to different maximum water level values ​​and adjusted as needed. The setting of the spring facilitates the first limit plate 17 to be firmly clamped with the first placement groove 21 and the second placement groove 22, and is easy to disassemble.

[0034] When the water level in the foundation pit rises, the buoy 11 moves upward, and the buoy 11 drives the connecting rod 12 and the connecting plate 13 to move upward together, then the induction switch 15 is conductive, and the water pump 6 starts to work. If the induction switch 15 is damaged and cannot work, when the water in the foundation pit 1 continues to rise, the isolation plate 18 moves upward until the connecting plate 13 contacts the lower surface of the first limit plate 17. At this time, the third wedge-shaped tip 36 leaves the first wedge-shaped tip 34 and the second wedge-shaped tip 35, and the first wedge-shaped tip 34 and the second wedge-shaped tip 35 are connected, that is, the first terminal 29 and the second terminal 30 are connected, then the water pump 6 starts to work, the water level in the foundation pit 1 drops, and the buoy 11 drives the connecting rod 12 and the connecting plate 13 to move downward, then the third wedge-shaped tip 36 moves downward, separating the first wedge-shaped tip 34 and the second wedge-shaped tip 35, and the water pump 6 stops working.

[0035] The setting of the fixing mechanism of the present invention ensures the stability of the foundation pit, the setting of the supporting mechanism facilitates the fixing of the water pump and the water pipe, and the setting of the water level linkage mechanism facilitates the monitoring of the water level in the foundation pit and the control of the working state of the water pump to avoid safety accidents such as excessive settlement of the surrounding area caused by excessive groundwater extraction.

Claims

1. A dewatering device for a foundation pit in a sandy soil foundation, comprising a water pump located at the top edge of the foundation pit, and a water pipe connected to the water pump and located in the foundation pit, characterized in that: It also includes a supporting mechanism for stabilizing the surface of the foundation pit, a fixing mechanism for supporting a water pump and fixing a water pipe, the fixing mechanism is provided with a water level linkage mechanism for linking the water level of the foundation pit with the working state of the water pump, the water level linkage mechanism includes a shell fixed to the fixing mechanism, a containing cavity located in the shell, a buoy movably connected to the side wall of the containing cavity through a sliding mechanism, a connecting mechanism fixedly connected to the top of the buoy, a second limiting plate located above the buoy, a first limiting plate located above the second limiting plate, an inductive switch fixedly connected to the first limiting plate and the connecting mechanism, and an extrusion switch fixedly connected to the second limiting plate and the connecting mechanism, the inductive switch is connected in parallel with the extrusion switch, the inductive switch is connected in series with the water pump and the power supply, and the extrusion switch is connected in series with the water pump and the power supply; The lower part of the shell is provided with a plurality of water inlet holes, and the connecting mechanism comprises a connecting rod fixedly connected to the top of the buoy and passing through the second limit plate, and a connecting plate fixedly connected to the top of the connecting rod, and the connecting rod passes through the second limit plate and moves in the vertical direction; The squeeze switch includes an isolating sheet fixedly connected to the lower surface of the connecting plate, a conductive mechanism fixedly connected to the lower surface of the second limiting plate, the conductive mechanism includes a fixing seat fixedly connected to the lower surface of the second limiting plate, a mounting cavity located in the fixing seat, a first terminal fixedly connected to the bottom of the mounting cavity, a second terminal, a first fixing sheet fixedly connected to the top of the first terminal, and a second fixing sheet fixedly connected to the top of the second terminal, a first wedge-shaped tip is provided at the left end of the first fixing sheet, a spring sheet is provided at the right end of the second fixing sheet, a second wedge-shaped tip is provided at the right end of the spring sheet, the position of the first wedge-shaped tip corresponds to the position of the second wedge-shaped tip, a third wedge-shaped tip is provided at the bottom of the isolating sheet, the third wedge-shaped tip is located between the first wedge-shaped tip and the second wedge-shaped tip, the isolating sheet passes through the fixing seat and moves in the mounting cavity, and the first terminal and the second terminal are connected in series with a power supply and a water pump through a wire; The sliding mechanism includes a slider fixedly connected to the outer surface of the float, a slide groove located on the surface of the accommodating cavity and cooperating with the slider, the length direction of the slide groove is the vertical direction, and the float moves in the vertical direction through the cooperation of the slider and the slide groove; the supporting mechanism includes a plurality of supporting piles fixedly connected to the surface of the foundation pit and in the vertical direction, a supporting column connected to two adjacent supporting piles and in the horizontal direction, and a supporting plate fixedly connected to the top of the supporting pile and located outside the foundation pit, and the water pump is fixedly connected to the upper surface of the support plate.

2. The dewatering device for a sand foundation pit according to claim 1, characterized in that: The right end of the second fixing plate is provided with a receiving groove opening to the right, a spring is fixedly connected in the receiving groove, and the left end of the elastic plate is fixedly connected in the receiving groove through the spring.

3. The dewatering device for a sand foundation pit according to claim 1, characterized in that: The fixing mechanism comprises a steel cage fixedly connected to the support column, and the water pipe and the shell are both fixedly connected to the steel cage.

4. The dewatering device for a sand foundation pit according to claim 1, characterized in that: A cover body is provided on the top of the accommodating cavity, and the cover body is threadedly connected to the outer surface of the shell.

5. The dewatering device for a sand foundation pit according to claim 1, characterized in that: The first limiting plate is fixedly connected to the side wall of the accommodating cavity through a placement mechanism. Several placement mechanisms are arranged at equal intervals in the vertical direction. The placement mechanism includes a first placement groove located on the left side of the accommodating cavity and opening to the right, a second placement groove located on the right side of the accommodating cavity and opening to the left, and springs located in the first placement groove and the second placement groove.

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