Device for dewatering ground of sand layer
By using a well structure composed of standard sections and water-passing sections in the sandy soil foundation, the problem of borehole collapse in the sandy soil layer was solved, enabling efficient dewatering construction and ensuring construction safety and cost control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA FIRST METALLURGICAL GROUP
- Filing Date
- 2023-04-26
- Publication Date
- 2026-07-07
AI Technical Summary
When dewatering foundation pits in sandy soil layers with high water content, the problem of hole collapse is likely to occur, resulting in low construction safety and efficiency.
The well structure consists of standard sections and water passage sections, including concentrically arranged steel cylinders, water passage holes, and filter gravel. Combined with screw and nut connectors and a switching mechanism, it forms a support structure to prevent borehole collapse and achieves effective filtration and extraction of groundwater through water passage pipes and filter gravel.
It effectively prevents the collapse of sandy soil layers, improves drilling efficiency, reduces costs, and ensures construction safety and efficiency.
Smart Images
Figure CN116517005B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of building construction technology, specifically relating to a dewatering device for sandy soil foundations. Background Technology
[0002] In some cases, construction sites must be selected in areas with complex geological conditions. Sandy soil layers with high water content are frequently encountered in current engineering construction. For well drilling for foundation pit dewatering, sandy soil layers with high water content often pose a great threat to the safety and progress of construction due to the tendency of the well to collapse. Summary of the Invention
[0003] This application provides a dewatering device for sandy soil foundations, which solves the problem of easy hole collapse when dewatering foundation pits in sandy soil layers with high water content.
[0004] This application provides a dewatering device for sandy soil foundations, comprising a well body, wherein the well body comprises, from top to bottom:
[0005] At least one standard section, the standard section comprising a second standard section steel cylinder and a first standard section steel cylinder arranged concentrically inside and outside, the second standard section steel cylinder and the first standard section steel cylinder being fixedly connected by a first connector;
[0006] The water passage section includes a first water passage section steel cylinder, a third water passage section steel cylinder, and a second water passage section steel cylinder arranged concentrically from the outside to the inside; the first water passage section steel cylinder has several water passage holes in its cylinder wall; the cavity between the first water passage section steel cylinder and the third water passage section steel cylinder is filled with filter gravel; a water passage pipe is arranged between the third water passage section steel cylinder and the second water passage section steel cylinder; the internal space of the second water passage section steel cylinder and the cavity where the filter gravel is located are connected through the water passage pipe.
[0007] The aforementioned dewatering device for sandy soil foundations uses a standard section and a water passage section to form the well body. A steel cylinder forms the support structure, and a water passage structure (composed of water passage holes, filter gravel, and water passage pipe) is configured in the water passage section. This ensures that groundwater can successfully enter the well body while preventing borehole collapse in sandy soil layers with high water content.
[0008] In one embodiment, when there are two or more standard sections, adjacent standard sections are connected by a third connector, which is a screw and nut connector. The screw and nut connector is also connected to a first connector on the adjacent standard section.
[0009] In one embodiment, the water passage further includes a fourth connector and a fifth connector; the fourth connector is located between the third water passage steel cylinder and the second water passage steel cylinder, and is used to fix the third water passage steel cylinder and the second water passage steel cylinder; the fifth connector is a fan-shaped steel plate connected to the upper ends of the first water passage steel cylinder and the third water passage steel cylinder; the first water passage steel cylinder and the third water passage steel cylinder are fixedly connected by multiple fifth connectors, the multiple fifth connectors are evenly arranged, and the gap between adjacent fifth connectors is used to fill the filter gravel.
[0010] In one embodiment, the standard section and the water passage section are connected by a third connector, which is a screw and nut connector. The screw and nut connector is simultaneously connected to a first connector on the adjacent standard section and a fourth connector on the water passage section.
[0011] In one embodiment, the lower end of the standard section is provided with a second connector, the upper part of the second connector is sleeved on the outside of the standard section, and the lower part of the second connector is configured to be able to be sleeved on the upper end of the water passage section or the upper end of the lower standard section.
[0012] In one embodiment, the lower end of the water-passing section is equipped with a soil-breaking section for breaking through the soil layer.
[0013] In one embodiment, the breaking section is a cylindrical steel shovel head.
[0014] In one embodiment, the well body further includes a grouting pipe and a grouting pipe head. The grouting pipe head is disposed on the breaking section with its opening facing the side. The upper end of the grouting pipe is located at the upper end of the well body, and the lower end of the grouting pipe is connected to the grouting pipe head. The pipe body of the grouting pipe is located between the second standard section steel cylinder and the first standard section steel cylinder of the standard section, and between the third water passage section steel cylinder and the second water passage section steel cylinder of the standard section.
[0015] In one embodiment, the well body further includes a switching mechanism, which comprises:
[0016] A rotating steel cylinder is located between the first and third water-passing sections of the steel cylinder, with its outer wall in contact with the inner wall of the first water-passing section. The rotating steel cylinder has several switching holes on its wall. The rotating steel cylinder is configured to rotate between an open and closed state. In the open state, the switching holes and the water-passing holes are wholly or partially overlapped. In the closed state, the switching holes and the water-passing holes are completely offset.
[0017] A gear ring, which is fixedly installed on the upper end of the inner wall of the rotating steel cylinder;
[0018] A gear, located between the first and second water-passing steel cylinders, meshes with the gear ring;
[0019] A drive rod, the lower end of which is connected to the gear, and the upper end of which extends out of the upper end of the well body, the drive rod being located between the second standard section steel cylinder and the first standard section steel cylinder.
[0020] In one embodiment, the water passage hole and / or the switch hole are provided with wire mesh or steel plate mesh.
[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0022] The accompanying drawings in this application are for illustrating preferred embodiments and to facilitate a clear understanding by those skilled in the art of various other advantages and benefits, and should not be construed as limiting the scope of this application. Furthermore, the same reference numerals are used to denote the same parts throughout the drawings.
[0023] Figure 1 This is a cross-sectional schematic diagram of a dewatering device for sandy soil foundations in one embodiment of this application.
[0024] Figure 2 This is a cross-sectional schematic diagram of the water passage in one embodiment of this application.
[0025] Figure 3 This is a cross-sectional schematic diagram of the breaking section in one embodiment of this application.
[0026] Figure 4 This is a top view of a water passageway in one embodiment of this application.
[0027] Figure 5 This is a top view of a standard section in one embodiment of this application.
[0028] Figure 6 for Figure 2 Schematic diagram of the cross section along the BB direction.
[0029] Figure 7 for Figure 2 Schematic diagram of the cross section in the CC direction.
[0030] Explanation of icon numbers:
[0031] Standard section 10, first standard section steel cylinder 11, second standard section steel cylinder 12, first connecting piece 13, second connecting piece 14, third connecting piece 15;
[0032] 20. Water passage section, 21. First water passage section steel cylinder, 22. Second water passage section steel cylinder, 23. Third water passage section steel cylinder, 24. Water passage pipe, 25. Water passage hole, 26. Fourth connector, 27. Fifth connector;
[0033] Breaking Ground Day 30;
[0034] Grouting pipe 40, grouting pipe head 41;
[0035] Switching mechanism 50, rotating steel cylinder 51, gear ring 52, gear 53, drive rod 54, switch hole 55;
[0036] Filtered gravel 60. Detailed Implementation
[0037] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0039] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly defined.
[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0041] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0043] Currently, most foundation pit dewatering construction employs a process of drilling holes first and then placing dewatering pipes. This approach is often unsuitable for sandy soil layers with high water content, as the high fluidity of sandy soil frequently leads to hole collapse (poor drilling results), resulting in improper placement of dewatering pipes. Furthermore, dealing with hole collapse requires multiple cleanings, potentially creating even greater risks of further collapse. Using a mud-wall-supported drilling process, on the other hand, requires the addition of mud pits and mud treatment equipment on-site, increasing costs.
[0044] See Figure 1-7As shown, this application provides a dewatering device for sandy soil foundations, including a well body. The well body includes at least one standard section 10 and one water-passing section 20, which are arranged vertically. The standard section 10 includes a first standard steel cylinder 11 and a second standard steel cylinder 12. The first standard steel cylinder 11 is fitted over the second standard steel cylinder 12 and is arranged concentrically. The first standard steel cylinder 11 and the second standard steel cylinder 12 are fixedly connected by a first connecting member 13. The water passage section 20 includes a first water passage section steel cylinder 21, a third water passage section steel cylinder 23, and a second water passage section steel cylinder 22 arranged concentrically. The second water passage section steel cylinder 22 is located inside the first water passage section steel cylinder 21, and the third water passage section steel cylinder 23 is located between the first water passage section steel cylinder 21 and the second water passage section steel cylinder 22. The cavity between the first water passage section steel cylinder 21 and the third water passage section steel cylinder 23 is filled with filter gravel 60. The wall of the first water passage section steel cylinder 21 is provided with several water passage holes 25. A water passage pipe 24 is arranged between the third water passage section steel cylinder 23 and the second water passage section steel cylinder 22. The internal space of the second water passage section steel cylinder 22 and the cavity where the filter gravel 60 is located are connected through the water passage pipe 24.
[0045] When using the aforementioned dewatering device for sandy soil foundations: First, the dewatering device for sandy soil foundations is modularly manufactured to the corresponding dimensions and specifications in the factory. Then, according to the design requirements, the height of each dewatering well is calculated to determine the number of standard sections 10 required for each well, and these sections are transported to the site. After on-site positioning, the water-passing section 20 is sunk first, followed by the standard sections 10. After each standard section 10 is sunk, the accumulated soil inside the device's cavity is excavated and cleaned using a corresponding rotary drilling rig. This process of sinking the standard sections 10 is repeated until the corresponding dewatering elevation is reached. After reaching the corresponding elevation, groundwater enters the filter gravel 60 through the water-passing hole 25 for filtration, and then enters the device through the water-passing pipe 24. A water pump is then used to pump the groundwater away, thus completing the dewatering operation. After dewatering is completed, the entire device is removed, dismantled in sections, and recycled for reuse. The aforementioned dewatering device for sandy soil foundations is modularly manufactured using standard section 10 and water-passing section 20. The well body is constructed with a double steel cylinder support structure, which not only protects the well wall during drilling but also allows for immediate use after drilling and reuse afterward, greatly ensuring well-drilling efficiency, reducing costs, and increasing construction safety. Therefore, this dewatering device for sandy soil foundations can prevent borehole collapse in sandy soil layers with high water content, effectively solving the problem of borehole collapse and improving drilling efficiency.
[0046] Specifically, the first connecting member 13 may be an annular steel plate, which is welded and fixed to the first standard section steel cylinder 11 and the second standard section steel cylinder 12.
[0047] It should be noted that the number of standard sections 10 is not fixed. The specific number required depends on the site conditions and is not limited here.
[0048] In some embodiments, the water passage section 20 further includes a fourth connector 26 and a fifth connector 27. The fourth connector 26 is used to fixably connect the third water passage section steel cylinder 23 and the second water passage section steel cylinder 22. The fifth connector 27 is a fan-shaped steel plate. The first water passage section steel cylinder 21 and the third water passage section steel cylinder 23 are fixedly connected by multiple fifth connectors 27. All fifth connectors 27 are evenly spaced and located at the upper ends of the first water passage section steel cylinder 21 and the third water passage section steel cylinder 23. The gap between adjacent fifth connectors 27 is used to fill filter gravel 60. The fourth connector 26 and the fifth connector 27 are used to connect the first water passage section steel cylinder 21, the second water passage section steel cylinder 22, and the third water passage section steel cylinder 23 into a whole, which facilitates transportation and installation.
[0049] Specifically, the fourth connecting member 26 can be an annular steel plate, which is welded and fixed to the third water passage section steel cylinder 23 and the second water passage section steel cylinder 22. The fifth connecting member 27 can be a fan-shaped steel plate, which is welded and fixed to the first water passage section steel cylinder 21 and the third water passage section steel cylinder 23.
[0050] In some embodiments, when more than two standard sections 10 are required, adjacent standard sections 10 are connected by a third connector 15, which is a screw and nut connector. The screw and nut connector is also connected to the first connector 13 on the adjacent standard section 10. In use, after the first standard section 10 is lowered, the second standard section 10 is lowered, and then the first connector 13 of the second standard section 10 is connected to the first connector 13 of the first standard section 10 using the screw and nut connector. This process is repeated until all standard sections 10 are lowered and connected. By using the screw and nut connector, a secure connection is ensured, while also facilitating disassembly and reusability, thus reducing costs.
[0051] It is understandable that the screw and nut connector mainly includes a screw and a nut. One end of the screw can be welded to a first connector 13, and the other end can be fixed by a nut after passing through a screw hole on another first connector 13 to form a tightened connection structure.
[0052] In some embodiments, the standard section 10 and the water passage section 20 are connected by a third connector 15, which is a screw and nut connector. The screw and nut connector is also connected to the first connector 13 on the adjacent standard section 10 and the fourth connector 26 on the water passage section 20. By using the screw and nut connector, a firm connection is ensured while also facilitating disassembly, allowing for reuse and reducing costs.
[0053] It is understandable that the screw and nut connector mainly includes a screw and a nut. One end of the screw can be welded to the first connector 13 (or the fourth connector 26), and the other end can be fixed by the nut after passing through the screw hole on the fourth connector 26 (or the first connector 13) to form a tightened connection structure.
[0054] In some embodiments, a second connector 14 is fixedly provided at the lower end of the standard section 10. The upper part of the second connector 14 is sleeved on the outside of the standard section 10. Specifically, the second connector 14 can be a ring. The lower part of the second connector 14 can be sleeved on the upper end of the water passage section 20 or the upper end of the lower standard section 10. By using the second connector 14, the concentricity between standard sections 10 and between standard sections 10 and water passage section 20 can be ensured, and the connection can also be strengthened.
[0055] In some embodiments, a soil-breaking section 30 is installed at the lower end of the water-passing section 20. Specifically, the soil-breaking section 30 can be a cylindrical steel shovel head used to break through the soil layer, facilitating the sinking and installation of the water-passing section 20.
[0056] In some embodiments, the well body further includes a grouting pipe 40 and a grouting pipe head 41. The grouting pipe head 41 is installed on the ground-breaking section 30, with its opening facing the side, and multiple grouting pipe heads 41 are evenly arranged circumferentially. The upper end of the grouting pipe 40 is located at the upper end of the well body (i.e., the upper end of the uppermost standard section 10), and the lower end of the grouting pipe 40 is connected to the grouting pipe head 41. During the sinking process of the water-passing section 20 and the entire device, a small amount of mud or high-pressure air is injected through the grouting pipe 40 and the grouting pipe head 41 to reduce drag, depending on the soil conditions at the site, to ensure smooth sinking.
[0057] Specifically, the grouting pipe 40 is located between the second standard section steel cylinder 12 and the first standard section steel cylinder 11 of the standard section 10, and between the third water-passing section steel cylinder 23 and the second water-passing section steel cylinder 22 of the standard section 10. This concealed design protects the grouting pipe 40.
[0058] In some embodiments, the well body further includes a switching mechanism 50, which includes a rotating steel cylinder 51 and a transmission mechanism. The transmission mechanism includes a gear ring 52, a gear 53, and a drive rod 54. The rotating steel cylinder 51 is located between the first water-passing section steel cylinder 21 and the third water-passing section steel cylinder 23, and is slightly shorter than the first water-passing section steel cylinder 21 and the third water-passing section steel cylinder 23. The outer wall of the rotating steel cylinder 51 is in contact with the inner wall of the first water-passing section steel cylinder 21. The rotating steel cylinder 51 has several switching holes 55. The gear ring 52 is fixedly installed on the upper end of the inner wall of the rotating steel cylinder 51. The gear 53 is located between the first water-passing section steel cylinder 21 and the second water-passing section steel cylinder 22, and the gear 53 meshes with the gear ring 52. The lower end of the drive rod 54 is fixedly connected to the gear 53, and the upper end of the drive rod 54 extends out of the upper end of the well body (i.e., the upper end of the uppermost standard section 10). The rotating steel cylinder 51 has an open and a closed state. In the open state, the switch hole 55 and the water passage hole 25 are fully or partially aligned. In the closed state, the switch hole 55 and the water passage hole 25 are completely offset. During the overall sinking of the water passage section 20 and the standard section 10, the rotating steel cylinder 51 remains in the closed state. After sinking to the corresponding elevation, the rotating drive rod 54 drives the gear 53 to rotate, which in turn drives the gear ring 52 to rotate, ultimately driving the rotating steel cylinder 51 to rotate until the switch hole 55 and the water passage hole 25 are fully or partially aligned, reaching the open state. At this time, groundwater can enter the filter gravel 60 through the switch hole 55 and the water passage hole 25. The switch mechanism 50 is designed to prevent water leakage during the sinking process, which would affect the sinking construction.
[0059] Specifically, the first connector 13 and the third connector 15 are provided with round holes, and the drive rod 54 passes through the round holes between the second standard section steel cylinder 12 and the first standard section steel cylinder 11. The concealed design protects the drive rod 54.
[0060] Specifically, the top of the drive rod 54 can be designed with a hexagonal structure similar to a nut, making it convenient to rotate the drive rod 54 using various tools, such as a wrench.
[0061] Furthermore, the water passage 25 and / or the switch hole 55 are provided with wire mesh or steel plate mesh. Preferably, both the water passage 25 and the switch hole 55 are provided with wire mesh or steel plate mesh for filtration, and this can prevent the leakage of the filtered water gravel 60.
[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A dewatering device for a sand layer foundation, characterized by: The well body includes, from top to bottom, the following components: At least one standard section (10), the standard section (10) includes a second standard section steel cylinder (12) and a first standard section steel cylinder (11) arranged concentrically inside and outside, and the second standard section steel cylinder (12) and the first standard section steel cylinder (11) are fixedly connected by a first connector (13); A water passage section (20) includes a first water passage section steel cylinder (21), a third water passage section steel cylinder (23), and a second water passage section steel cylinder (22) arranged concentrically from the outside to the inside. The first water passage section steel cylinder (21) has several water passage holes (25) on its wall. The cavity between the first water passage section steel cylinder (21) and the third water passage section steel cylinder (23) is filled with filter gravel (60). A water passage pipe (24) is arranged between the third water passage section steel cylinder (23) and the second water passage section steel cylinder (22). The internal space of the second water passage section steel cylinder (22) and the cavity where the filter gravel (60) is located are connected through the water passage pipe (24). The water passage section (20) further includes a fourth connector (26) and a fifth connector (27); the fourth connector (26) is located between the third water passage section steel cylinder (23) and the second water passage section steel cylinder (22) and is used to fix the third water passage section steel cylinder (23) and the second water passage section steel cylinder (22); the fifth connector (27) is a fan-shaped steel plate and is connected to the upper ends of the first water passage section steel cylinder (21) and the third water passage section steel cylinder (23); the first water passage section steel cylinder (21) and the third water passage section steel cylinder (23) are fixedly connected by multiple fifth connectors (27), the multiple fifth connectors (27) are evenly arranged, and the gap between adjacent fifth connectors (27) is used to fill the filter gravel (60); The lower end of the water passage section (20) is equipped with a soil breaking section (30) for breaking through the soil layer; The well body also includes a grouting pipe (40) and a grouting pipe head (41). The grouting pipe head (41) is disposed on the ground-breaking section (30) with its opening facing the side. The upper end of the grouting pipe (40) is located at the upper end of the well body, and the lower end of the grouting pipe (40) is connected to the grouting pipe head (41). The pipe body of the grouting pipe (40) is located between the second standard section steel cylinder (12) and the first standard section steel cylinder (11) of the standard section (10), and between the third water passage section steel cylinder (23) and the second water passage section steel cylinder (22) of the water passage section (20). The well body also includes a switching mechanism (50), which includes: A rotating steel cylinder (51) is located between the first water-passing section steel cylinder (21) and the third water-passing section steel cylinder (23). The outer wall of the rotating steel cylinder (51) is in contact with the inner wall of the first water-passing section steel cylinder (21). The rotating steel cylinder (51) has a plurality of switch holes (55) on its cylinder wall. The rotating steel cylinder (51) is configured to be able to rotate and switch between an open state and a closed state. In the open state, the switch holes (55) are fully or partially overlapped with the water-passing holes (25). In the closed state, the switch holes (55) are completely offset from the water-passing holes (25). A gear ring (52) is fixedly installed on the upper end of the inner wall of the rotating steel cylinder (51); Gear (53), the gear (53) is located between the first water passage steel cylinder (21) and the second water passage steel cylinder (22), and the gear (53) meshes with the gear ring (52); The drive rod (54) has its lower end connected to the gear (53) and its upper end extends out of the upper end of the well body. The drive rod (54) is located between the second standard section steel cylinder (12) and the first standard section steel cylinder (11).
2. The dewatering device for sandy soil foundations according to claim 1, characterized in that: When there are two or more standard sections (10), adjacent standard sections (10) are connected by a third connector (15), which is a screw and nut connector. The screw and nut connector is also connected to the first connector (13) on the adjacent standard section (10).
3. The dewatering device for sandy soil foundations according to claim 1, characterized in that: The standard section (10) and the water passage section (20) are connected by a third connector (15), which is a screw and nut connector. The screw and nut connector is simultaneously connected to the first connector (13) on the adjacent standard section (10) and the fourth connector (26) on the water passage section (20).
4. The dewatering device for sandy soil foundations according to claim 1, characterized in that: The lower end of the standard section (10) is provided with a second connector (14), the upper part of the second connector (14) is sleeved on the outside of the standard section (10), and the lower part of the second connector (14) is configured to be able to be sleeved on the upper end of the water passage section (20) or the upper end of the lower standard section (10).
5. The dewatering device for sandy soil foundations according to claim 1, characterized in that: The breaking section (30) is a cylindrical steel shovel head.
6. The dewatering device for sandy soil foundations according to claim 1, characterized in that: The water passage (25) and / or the switch hole (55) are provided with wire mesh or steel plate mesh.