A device and process for deep and shallow well combined precipitation

Abstract

The application relates to a deep-shallow well combined precipitation equipment and a precipitation process, and relates to the field of water pumping equipment. The deep-shallow well combined precipitation equipment comprises a water pumping pump, a filter cylinder and a scraping device. The water pumping pump is connected with the filter cylinder through a water pumping pipe. The scraping strip of the scraping device rotates around the filter cylinder to clean the outer wall of the filter cylinder. The scraping device is also provided with a driving assembly, a blocking piece and other structures. The application also comprises a corresponding precipitation process. The shallow well is used to pump up the underground water, and the deep well penetrates the water-resisting layer. The separation valve is closed in the early stage to prevent pumping up the confined water. After the foundation pit is excavated to the predetermined depth, the separation valve is opened to pump up the confined water. The application can ensure that the water can be pumped up even if the sand content is too large.

Description

Technical Field

[0001] This application relates to the field of pumping equipment, and in particular to a combination of deep and shallow well dewatering equipment and dewatering process. Background Technology

[0002] In the fields of building construction and underground engineering, dewatering plays a crucial role. With the acceleration of urbanization and the continuous advancement of infrastructure construction, various large-scale buildings and underground projects are springing up like mushrooms after rain. Effective dewatering can lower the groundwater level, creating a dry and stable environment for construction, ensuring the smooth progress of the project and the safety of the structure.

[0003] In existing dewatering operations, the most common dewatering equipment is the single-well dewatering system. Single-well dewatering systems typically extract groundwater directly using a single pump and pipe.

[0004] Existing single-well dewatering equipment relies on simple filter structures for filtration when dealing with geology with normal sand content, using natural water flow to prevent filter clogging. However, when encountering geology with excessive sand content, existing pumping equipment struggles to effectively extract groundwater, especially under conditions of high sand content, where these problems become more pronounced. Therefore, providing equipment capable of pumping water even under conditions of high sand content is an urgent problem to be solved. Summary of the Invention

[0005] To ensure that water can still be pumped even when the sand content is too high, this application provides a combination of deep and shallow well dewatering equipment and dewatering scheme.

[0006] In the first aspect, this application provides a device for combined deep and shallow well dewatering, which adopts the following technical solution: A combined deep and shallow well dewatering device includes a water pump, a filter cylinder, and a scraper. The water pump is connected to a water pumping pipe at its pumping port, and the end of the water pumping pipe away from the pumping port is the pumping end. The water pumping pipe is fixed to the filter cylinder, and the water pumping end of the water pumping pipe extends into the filter cylinder; the filter cylinder wall is provided with multiple filter holes; the length direction of the filter cylinder is parallel to the first direction. The scraping device includes: A scraper strip with scraping edges parallel to a first direction and in contact with the outer wall of the filter cylinder, the scraper strip being rotatably connected to the filter cylinder around its circumference.

[0007] By adopting the above technical solution, the water pump draws water from the filter cylinder through the pumping pipe, and the filter holes of the filter cylinder can filter the water. The scraper bar rotates around the circumference of the filter cylinder, and its scraping edges can continuously scrape off the mud, sand and other impurities attached to the outer wall of the filter cylinder, keeping the filter holes unobstructed. This ensures that water can smoothly enter the filter cylinder and be pumped away, effectively preventing the filter cylinder from clogging, ensuring that the equipment can stably carry out dewatering operations, and ensuring that water can still be pumped even when the sand content is too high.

[0008] Optionally, the scraping device assembly further includes a drive assembly, the drive assembly comprising: A connecting seat fixedly connected to the outer periphery of the filter cylinder; An external toothed ring is coaxially disposed around the outer periphery of the filter cylinder. The external teeth are rotatably connected to the connecting seat around their own axis. The axis of the external toothed ring coincides with the axis of the filter cylinder. The scraper is fixedly connected to the external toothed ring. The gear connected to the connecting seat is rotated, and the gear meshes with the external gear ring; In addition, a motor is connected between the connecting seat and the gear, the motor being used to drive the gear to rotate along the connecting seat.

[0009] By adopting the above technical solution, the motor drives the gear to rotate, and the gear meshes with the external gear ring to drive the external gear ring to rotate, thereby causing the scraper to rotate around the filter cylinder in a circumferential direction, so as to achieve the purpose of automatically scraping off impurities on the outer wall of the filter cylinder, improving cleaning efficiency and ensuring the filtration effect of the filter cylinder.

[0010] Optionally, the scraping device further includes a sealing element, the sealing element comprising: An outer sealing ring is fixedly connected to the connecting seat, and the gear and the outer gear ring are located in the inner ring of the outer sealing ring; one end of the outer sealing ring is end A, and the other end is end B, and end A of the outer sealing ring is sealed by the connecting seat; And, an end sealing ring, the end sealing ring being fixedly connected to end B of the outer sealing ring and used to seal end B of the outer sealing ring; the end sealing ring having a through-hole clearance groove for the scraper strip to pass through and rotate with the outer toothed ring; One end of the scraper is located inside the outer sealing ring, and the other end passes through the clearance ring groove and extends to the outside of the outer sealing ring.

[0011] By adopting the above technical solution, the outer sealing ring is fixedly connected to the connecting seat, and the gear and the outer gear ring are located inside it. The end sealing ring is fixedly connected to the B end of the outer sealing ring. The two work together to protect the gear and the outer gear ring, reduce the entry of impurities such as mud and sand into the meshing part of the gear and the outer gear ring, and ensure that the drive component can operate normally. The scraper strip extends to the outside of the outer sealing ring after passing through the clearance ring groove of the end sealing ring. This does not affect the rotation of the scraper strip to scrape off impurities on the outer wall of the filter cylinder, and can also prevent mud and sand from entering the outer sealing ring from the clearance ring groove to a certain extent, thus affecting the normal operation of the gear and the outer gear ring.

[0012] Optionally, a rotating ring is coaxially rotatably connected to the avoidance ring groove, and the rotating ring has a through hole along the first direction for the scraper strip to pass through.

[0013] By adopting the above technical solution, the rotating ring can make the scraper bar rotate stably in the clearance ring groove, avoid the scraper bar from shaking, and at the same time reduce the entry of impurities such as mud and sand into the outer sealing ring from the clearance ring groove.

[0014] Optionally, the outer peripheral wall of the rotating ring fits into the inner peripheral wall of the clearance ring groove; the end sealing ring has an annular groove on the inner peripheral wall of the rotating ring groove, and a bearing is adapted in the annular groove, with the inner ring of the bearing coaxially fixedly sleeved on the outer peripheral wall of the rotating ring.

[0015] By adopting the above technical solution, the outer peripheral wall of the rotating ring fits into the inner peripheral wall of the clearance ring groove, which can reduce the entry of impurities such as mud and sand into the outer sealing ring from the clearance ring groove; the end sealing ring has an annular groove in the inner peripheral wall of the rotating ring groove and is equipped with a suitable bearing, and the inner ring of the bearing is coaxially fixedly sleeved on the outer peripheral wall of the rotating ring, which can ensure the smooth rotation of the rotating ring.

[0016] Optionally, a brush is fixedly connected to the side wall of the scraper strip, and the brush contacts the outer peripheral wall of the filter cylinder.

[0017] By adopting the above technical solution, the brush fixedly connected to the side wall of the scraper bar contacts the outer peripheral wall of the filter cylinder, which can further clean the impurities on the outer peripheral wall of the filter cylinder and improve the cleaning effect.

[0018] Optionally, the scraper is fixedly connected to a plurality of material-pulling rods, and the material-pulling rods form an angle with the scraper.

[0019] By adopting the above technical solution, the material-pushing rod can push aside the surrounding mud, sand and other impurities as it rotates with the scraper, preventing impurities from accumulating around the filter cylinder.

[0020] Optionally, a plurality of insert rods are fixedly connected to the bottom of the filter cartridge, and the insert rods are parallel to the first direction.

[0021] By adopting the above technical solution, multiple rods parallel to the first direction are fixed at the bottom of the filter cartridge, which can be easily inserted into the ground to fix the position of the filter cartridge.

[0022] Optionally, the end of the insertion rod away from the filter cylinder is pointed.

[0023] By adopting the above technical solution, the end of the insertion rod away from the filter cylinder is pointed, which makes it easy to insert the filter cylinder into the ground.

[0024] Secondly, this application provides a dewatering process that combines deep and shallow wells with the aforementioned dewatering equipment, employing the following technical solution: A precipitation process includes the following steps: S1: Set up at least one shallow well, the bottom of which is located above the impermeable layer at the interface between the unconfined water and the pressurized water, for the purpose of extracting unconfined water; S2: At least one deep well is provided, the deep well penetrating the impermeable layer and extending to the confined aquifer, and the deep well is provided with a separation valve at the location of the impermeable layer to prevent the extraction of the confined water; In the early stage of foundation pit excavation, the shallow well is activated for underwater pumping, and the separation valve of the deep well is kept closed to prevent the confined water from being pumped out. When the foundation pit is excavated to the predetermined depth, the separation valve is opened to allow the deep well to pump out the confined water. During pumping, the combined deep and shallow well dewatering equipment is used.

[0025] By adopting the above technical solution, dewatering equipment can be used to carry out combined deep and shallow well dewatering. In the early stage, shallow wells are used to extract unconfined water to avoid extracting confined water. After the foundation pit is excavated to the predetermined depth, the separation valve is opened to allow deep wells to extract confined water, so as to achieve targeted extraction of different groundwater at different stages.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The filter cartridge, when used with a water pump, can extract filtered water. When the scraper bar rotates, the scraper edge can scrape off mud and sand impurities from the outer wall of the filter cartridge, keeping the filter holes unobstructed and facilitating water extraction in geological formations with excessive sand content. When the scraper bar rotates, it can push aside surrounding mud, sand and other impurities, preventing impurities from accumulating around the filter cylinder; This application utilizes dewatering equipment to conduct combined deep and shallow well dewatering. In the early stage, shallow wells are used to extract unconfined groundwater, avoiding the extraction of confined groundwater. After the foundation pit is excavated to the predetermined depth, the separation valve is opened to allow the deep wells to extract confined groundwater, thus achieving targeted extraction of different groundwater at different stages and reducing the waste of water resources. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the precipitation equipment in the embodiments of this application; Figure 2 This is a schematic diagram of the scraping device in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the driving component in the embodiments of this application; Figure 4 yes Figure 2 Enlarged view of section A.

[0028] Explanation of reference numerals in the attached drawings: 1. Water pump; 11. Pumping pipe; 2. Filter cylinder; 21. Filter hole; 22. Insert rod; 3. Scraper device; 31. Scraper strip; 311. Scraper edge; 312. Brush; 313. Push rod; 32. Drive assembly; 321. Connecting seat; 322. External gear ring; 323. Gear; 324. Motor; 33. Sealing component; 331. External sealing ring; 3311. End A; 3312. End B; 332. End sealing ring; 3321. Avoidance ring groove; 3322. Annular groove; 334. Rotating ring; 3341. Perforation; 335. Bearing. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail. For ease of description, this application introduces directional terms such as first direction, second direction, and third direction to form a three-dimensional reference direction. The directional terms used, such as "first direction, second direction, and third direction," can be specifically referred to in the figure, where X represents the first direction, Y represents the second direction, Z represents the third direction, and the first direction, second direction, and third direction are perpendicular to each other.

[0030] This application discloses a device for combined deep and shallow well dewatering. (Refer to...) Figure 1 and Figure 2 The equipment for combined deep and shallow well dewatering includes a water pump 1, a filter cylinder 2, and a scraper 3. The water pump 1 is the power source for pumping water for the entire equipment. The filter cylinder 2 has multiple filter holes 21 on its cylinder wall. The filter cylinder 2 is a cylindrical cylinder, and the length direction of the filter cylinder 2 is parallel to a first direction, which can be understood as the vertical direction when the equipment is installed. Multiple insertion rods 22 are fixedly connected to the bottom of the filter cylinder 2. The insertion rods 22 are parallel to the first direction, and the end of the insertion rod 22 away from the filter cylinder 2 is pointed, which makes it easy to insert the filter cylinder 2 into the ground and fix the position of the filter cylinder 2. The water pump 1 is usually a centrifugal pump; the water pump 1 has a water pumping pipe 11 connected to its water pumping port, and the end of the water pumping pipe 11 away from the water pumping port is the water pumping end; the water pumping pipe 11 is generally made of metal pipe, such as steel pipe, which has good strength and corrosion resistance; one end of the water pumping pipe 11 is sealed to the water pumping port of the water pump 1, for example, by using a rubber sealing ring, and the other end of the water pumping end extends into the filter cylinder 2 and is welded and fixed to the filter cylinder 2 so as to draw the filtered water in the filter cylinder 2.

[0031] Reference Figure 2 and Figure 3 The scraping device 3 includes a scraping strip 31 with scraping edges 311. The scraping strip 31 in the scraping device 3 is usually made of metal, such as aluminum alloy, which is lightweight and has high strength. The scraping edges 311 are parallel to the first direction and fit against the outer wall of the filter cylinder 2. The scraping strip 31 rotates around the circumference of the filter cylinder 2 and is connected to the filter cylinder 2. When the scraping strip 31 rotates around the circumference of the filter cylinder 2, the scraping edges 311 can scrape off the impurities on the outer wall of the filter cylinder 2. The scraping strip 31 can also be made of other materials such as plastic strip, as long as it can achieve the scraping function. In some embodiments of this application, a brush 312 is fixedly connected to the side wall of the scraping strip 31. The brush 312 is generally made of nylon, which is soft and wear-resistant. The brush 312 contacts the outer peripheral wall of the filter cylinder 2. When the scraping strip 31 rotates, the brush 312 can further clean the impurities on the outer peripheral wall of the filter cylinder 2, improving the cleaning effect.

[0032] Reference Figure 2 and Figure 3 The scraper bar 31 is fixedly connected to multiple material-pushing rods 313. These rods are typically made of metal, such as iron. The multiple material-pushing rods 313 are spaced apart along the length of the scraper bar 31. An angle is formed between the material-pushing rods 313 and the scraper bar 31, which can be any angle between 30° and 60°. As the scraper bar 31 rotates, the material-pushing rods 313 can push aside surrounding mud, sand, and other impurities, preventing impurities from accumulating around the filter cylinder 2.

[0033] Reference Figure 2 and Figure 3 In some embodiments of this application, in order to drive the scraper strip 31 to rotate, the scraper device 3 assembly further includes a drive assembly 32. The drive assembly 32 includes a connecting seat 321, an external gear ring 322, a gear 323, and a motor 324. The connecting seat 321 is generally made of metal, such as carbon steel, and is fixedly connected to the outer periphery of the filter cylinder 2 by welding or other means. The external gear ring 322 is coaxially sleeved on the outer periphery of the filter cylinder 2, and the external gear ring 322 is rotatably connected to the connecting seat 321 around its own axis. The axis of the external gear ring 322 coincides with the axis of the filter cylinder 2. The scraper strip 31 is fixedly connected to the external gear ring 322 by welding or bolting, so that when the external gear ring 322 rotates, it can drive the scraper strip 31 to rotate. Gear 323 is rotatably connected to connecting seat 321 and meshes with external gear ring 322. Motor 324 is connected between connecting seat 321 and gear 323. Motor 324 is used to drive gear 323 to rotate along connecting seat 321. Specifically, the housing of motor 324 is fixedly connected to connecting seat 321, and the output shaft is coaxially fixedly connected to gear 323. When motor 324 starts, motor 324 drives gear 323 to rotate. Gear 323 meshes with external gear ring 322, drives external gear ring 322 to rotate, and then drives scraper strip 31 to rotate around filter cylinder 2.

[0034] Reference Figure 2 and Figure 4 To reduce the amount of mud and sand entering between the gear 323 and the external gear ring 322, in some embodiments of this application, the scraping device 3 further includes a sealing member 33, which includes an outer sealing ring 331 and an end sealing ring 332. One end of the outer sealing ring 331 is end A 3311, and the other end is end B 3312. End A 3311 of the outer sealing ring 331 is fixedly connected to the connecting seat 321 by welding, and the portion between the outer peripheral wall of the filter cylinder 2 and end A 3311 of the outer sealing ring 331 is sealed by the connecting seat 321. The gear 323 and the external gear ring 322 are both located within the inner ring of the outer sealing ring 331. The end sealing ring 332 is fixedly connected to the B end 3312 of the outer sealing ring 331, and the portion between the outer peripheral wall of the filter cylinder 2 and the B end 3312 of the outer sealing ring 331 is sealed by the end sealing ring 332; the end sealing ring 332 has a through-hole relief ring groove 3321 for the scraper strip 31 to pass through and rotate with the external gear 323; one end of the scraper strip 31 is located inside the outer sealing ring 331, and the other end extends to the outside of the outer sealing ring 331 after passing through the relief ring groove 3321; the outer sealing ring 331 and the end sealing ring 332 can reduce the entry of impurities such as mud and sand into the meshing part of the gear 323 and the external gear ring 322, ensuring the normal operation of the drive assembly 32; in order to further reduce the entry of impurities such as mud and sand into the gear 323 and the external gear ring 322, the filter cylinder 2 does not have a filter hole 21 in the portion between the connecting seat 321 and the end sealing ring 332, so as to prevent mud and sand from entering the inner ring of the outer sealing ring 331.

[0035] Reference Figure 2 and Figure 4 In order to reduce the entry of impurities such as mud and sand into the outer sealing ring 331 from the clearance ring groove 3321, in some embodiments of this application, a rotating ring 334 is adapted to be rotatably connected to the clearance ring groove 3321 on the coaxial side. The rotating ring 334 has a through hole 3341 through which the scraper 31 is adapted to pass. The scraper 31 is restricted by the hole wall of the through hole 3341 and cannot shake. The rotating ring 334 is generally made of plastic material, such as polytetrafluoroethylene. Polytetrafluoroethylene has self-lubricating properties and can reduce friction during rotation. The outer peripheral wall of the rotating ring 334 fits against the inner peripheral wall of the clearance ring groove 3321. The end sealing ring 332 has an annular groove 3322 on the inner peripheral wall of the groove of the rotating ring 334. A bearing 335 is fitted in the annular groove 3322. The inner ring of the bearing 335 is coaxially fixedly sleeved on the outer peripheral wall of the rotating ring 334. The bearing 335 can be a deep groove ball bearing 335, which can ensure the smooth rotation of the rotating ring 334.

[0036] The implementation principle of a combined deep and shallow well dewatering device in this application embodiment is as follows: the combined deep and shallow well dewatering device provides pumping power through a water pump 1, filters the water through a filter cylinder 2, and a scraper device 3 prevents the filter cylinder 2 from clogging. Specifically, the drive component 32 drives the scraper strip 31 to rotate. When the scraper strip 31 rotates, the scraper edge 311 can scrape off the mud, sand and other impurities attached to the outer wall of the filter cylinder 2, keeping the filter hole 21 unobstructed, so that water can smoothly enter the filter cylinder 2 and be drawn away.

[0037] This application also discloses a precipitation process that uses the aforementioned precipitation equipment to perform combined precipitation on deep and shallow wells, including the following steps: S1: Set up at least one shallow well, with the bottom of the well located above the impermeable layer at the interface between unconfined and confined water, for the purpose of extracting unconfined water. When setting up the shallow well, appropriate drilling equipment, such as a rotary drilling rig, must be used, and the appropriate drill bit must be selected according to the geological conditions to ensure that the depth and diameter of the shallow well meet the requirements. During the drilling process, attention should be paid to controlling the drilling speed and the use of drilling mud to prevent wellbore collapse.

[0038] S2: At least one deep well shall be installed, penetrating the impermeable layer and extending to the confined aquifer. A separation valve shall be installed at the impermeable layer location to prevent the extraction of confined water. Specialized drilling equipment must be used when installing the deep well, and the verticality and sealing of the well must be ensured. The separation valve can be electric or manual, selected according to the specific circumstances. In the early stage of foundation pit excavation, shallow wells are activated for submersible pumping, while the separator valve of the deep well is kept closed to prevent the extraction of confined water. At this time, the shallow well pump 1 starts working to extract the submersible water and lower the groundwater level. When the foundation pit is excavated to the predetermined depth, the separator valve is opened to allow the deep well to extract confined water. During pumping, the combined deep and shallow well dewatering equipment is used. This can more effectively lower the groundwater level and create favorable conditions for foundation pit construction.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for deep and shallow well combined precipitation, characterized in that, It includes a water pump (1), a filter cartridge (2), and a scraper (3); The water pump (1) is connected to a water pump pipe (11) at its water inlet, and the end of the water pump pipe (11) away from the water inlet of the water pump (1) is the water pumping end. The water pumping pipe (11) is fixed to the filter cylinder (2), and the water pumping end of the water pumping pipe (11) extends into the filter cylinder (2); the filter cylinder (2) has a plurality of filter holes (21) on its cylinder wall; the length direction of the filter cylinder (2) is parallel to the first direction. The scraping device (3) includes: A scraper strip (31) with scraping edge (311) parallel to a first direction and the scraping edge (311) is attached to the outer wall of the filter cylinder (2). The scraper strip (31) is circumferentially connected to the filter cylinder (2).

2. The equipment for combined deep and shallow well dewatering according to claim 1, characterized in that, The scraping device (3) assembly further includes a drive assembly (32), which includes: A connecting seat (321) is fixedly connected to the outer periphery of the filter cylinder (2); An external toothed ring (322) is coaxially disposed on the outer periphery of the filter cylinder (2). The external toothed ring (322) is rotatably connected to the connecting seat (321) around its own axis. The axis of the external toothed ring (322) coincides with the axis of the filter cylinder (2). The scraper strip (31) is fixedly connected to the external toothed ring (322). The gear (323) rotatably connects to the connecting seat (321), and the gear (323) meshes with the external gear ring (322); And a motor (324) connected between the connecting seat (321) and the gear (323), the motor (324) being used to drive the gear (323) to rotate along the connecting seat (321).

3. The equipment for combined deep and shallow well dewatering according to claim 2, characterized in that, The scraping device (3) further includes a sealing member (33), the sealing member (33) comprising: An outer sealing ring (331) is fixedly connected to the connecting seat (321), and the gear (323) and the external gear ring (322) are located in the inner ring of the outer sealing ring (331); one end of the outer sealing ring (331) is end A (3311), and the other end is end B (3312), and end A (3311) of the outer sealing ring (331) is sealed by the connecting seat (321); And, an end sealing ring (332), the end sealing ring (332) is fixedly connected to the B end (3312) of the outer sealing ring (331) and is used to seal the B end (3312) of the outer sealing ring (331); the end sealing ring (332) has a through-hole opening with a clearance ring groove (3321) for the scraper strip (31) to pass through and rotate with the outer toothed ring (322); One end of the scraper (31) is located inside the outer sealing ring (331), and the other end passes through the clearance ring groove (3321) and extends to the outside of the outer sealing ring (331).

4. The equipment for combined deep and shallow well dewatering according to claim 3, characterized in that, A rotating ring (334) is coaxially rotatably connected to the avoidance ring groove (3321), and the rotating ring (334) has a through hole (3341) through which the scraper strip (31) fits and passes along the first direction.

5. The equipment for combined deep and shallow well dewatering according to claim 4, characterized in that, The outer peripheral wall of the rotating ring (334) fits against the inner peripheral wall of the clearance ring groove (3321); the end sealing ring (332) has an annular groove (3322) on the inner peripheral wall of the groove of the rotating ring (334), and a bearing (335) is adapted in the annular groove (3322), and the inner ring of the bearing (335) is coaxially fixedly sleeved on the outer peripheral wall of the rotating ring (334).

6. A combined deep and shallow well dewatering device according to any one of claims 1-5, characterized in that, A brush (312) is fixedly connected to the side wall of the scraper (31), and the brush (312) is in contact with the outer peripheral wall of the filter cylinder (2).

7. The equipment for combined deep and shallow well dewatering according to claim 6, characterized in that, The scraper (31) is fixedly connected to a plurality of push rods (313), and the push rods (313) and the scraper (31) form an angle.

8. The equipment for combined deep and shallow well dewatering according to claim 7, characterized in that, The bottom of the filter cylinder (2) is fixedly connected with a plurality of insert rods (22), which are parallel to the first direction.

9. The equipment for combined deep and shallow well dewatering according to claim 8, characterized in that, The end of the insertion rod (22) away from the filter cylinder (2) is pointed.

10. A precipitation process for combined precipitation of deep and shallow wells using the precipitation equipment described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Set up at least one shallow well, the bottom of which is located above the impermeable layer at the interface between the unconfined water and the pressurized water, for the purpose of extracting unconfined water; S2: At least one deep well is provided, the deep well penetrating the impermeable layer and extending to the confined aquifer, and the deep well is provided with a separation valve at the location of the impermeable layer to prevent the extraction of the confined water; In the early stage of foundation pit excavation, the shallow well is activated for underwater pumping, and the separation valve of the deep well is kept closed to prevent the confined water from being pumped out. When the foundation pit is excavated to the predetermined depth, the separation valve is opened to allow the deep well to pump out the confined water. During pumping, the combined deep and shallow well dewatering equipment is used.

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