Dewatering pipe for foundation pit well point dewatering

Abstract

The downcast pipe comprises downcast pipes which are distributed on the side face of a foundation pit and communicated with underground water, the top ends of the downcast pipes are located above the foundation face of the foundation pit, and filtering assemblies are movably arranged in the downcast pipes. The filter assembly is connected with a fixing pipe used for inserting the filter assembly into the downcast pipe or taking the filter assembly out of the downcast pipe, the upper end of the fixing pipe is open, the lower end of the fixing pipe is closed, and a plurality of water passing holes located above the filter assembly are formed in the side wall of the fixing pipe. The open end of the fixing pipe is sleeved with a hose communicated with the water pump. The filtering assembly can be pulled out of the downcast pipe to be cleaned, the filtering assembly is prevented from being blocked, it is guaranteed that a water path between underground water and the downcast pipe is in a closed state, and the foundation pit well point dewatering effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit dewatering technology, specifically to a dewatering pipe used for foundation pit wellpoint dewatering. Background Technology

[0002] Wellpoint dewatering is a crucial step in ensuring the safety of foundation pit excavation and preventing collapse accidents during the excavation process. Current wellpoint dewatering methods involve inserting dewatering pipes into the groundwater layer below the surface, then pumping water through pipelines to a sump or other storage location. To prevent impurities in the groundwater from clogging the pumps, a filter section is typically installed at the lower end of the dewatering pipe. For example, Chinese patent CN211713996U describes a lightweight wellpoint dewatering system for foundation pits, which includes a filter section at the lower end of the dewatering pipe located within the groundwater layer. However, after prolonged filtration, the filter section is prone to clogging. Since it is underground, it cannot be promptly removed and cleaned, leading to poor dewatering efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide a dewatering pipe for wellpoint dewatering of foundation pits, which can pull out the filter component from the dewatering pipe for cleaning, avoid the filter component being blocked, ensure that the water passage between the groundwater and the dewatering pipe is in a passable state, and ensure that the wellpoint dewatering of foundation pits does not carry away the mud and sand in the soil, thus preventing the foundation pit from collapsing.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following solution:

[0005] A dewatering pipe for wellpoint dewatering of foundation pits includes dewatering pipes distributed on the side of the foundation pit and connected to groundwater. The top of the dewatering pipe is located above the foundation surface of the foundation pit. A filter assembly is movably installed inside the dewatering pipe. A fixing pipe for inserting or removing the filter assembly from the dewatering pipe is connected to the filter assembly. The fixing pipe is open at the top and closed at the bottom. Several water passage holes are provided on the side wall of the fixing pipe above the filter assembly. A connector that can be detachably connected to the dewatering pipe is provided on the upper part of the fixing pipe. A flexible hose connected to a water pump is sleeved on the open end of the fixing pipe.

[0006] In this scheme, dewatering pipes are generally distributed on the side of the foundation pit and connected to the groundwater, allowing direct pumping from areas with higher groundwater levels. The top of the dewatering pipe is located above the foundation surface of the pit for easy installation and maintenance. The dewatering pipe is equipped with a movable filter assembly to prevent impurities in the groundwater from entering the dewatering pipe, thereby protecting the water pump from damage. The filter assembly is connected to a fixing pipe for inserting or removing the filter assembly from the dewatering pipe. The upper part of the fixing pipe is equipped with a connector that can be detachably connected to the dewatering pipe, which facilitates quick replacement or cleaning of the filter assembly when needed, avoids clogging of the filter assembly, ensures that the water passage between the groundwater and the dewatering pipe is unobstructed, and guarantees the dewatering effect of the foundation pit wellpoint. During installation, the filter assembly is first installed inside the dewatering pipe through a fixed pipe and connectors. Then, a flexible hose is connected to the open end of the fixed pipe, and the flexible hose is connected to a water pump. Under the action of the water pump, the groundwater passes through the filter assembly and enters the fixed pipe through the water passage hole on the side wall of the fixed pipe. Finally, it is transported to the flexible hose through the open end and then pumped to the designated location by the water pump. During the dewatering process, the filter assembly is checked regularly for blockage and cleaned or replaced as needed to ensure that the filter assembly is not blocked and to ensure the normal operation of the foundation pit dewatering.

[0007] Optionally, the filter assembly is a multi-layer filter assembly, which includes a first filter plate and a second filter plate. The first filter plate is located below the second filter plate. Both the first filter plate and the second filter plate have a plurality of filter holes. The diameter of the filter holes on the first filter plate is larger than that on the second filter plate. The middle of both the first filter plate and the second filter plate is connected to a fixed pipe.

[0008] Optionally, the first filter plate and the second filter plate are circumferentially connected by a fixing ring, the size of which is adapted to the inner diameter of the downpipe.

[0009] Optionally, a sealing ring is embedded in the circumferential sidewall of the retaining ring.

[0010] Optionally, the filter assembly is located near the lower end of the rainwater pipe.

[0011] Optionally, the connector includes a mounting plate and a fixing sleeve. The mounting plate has an external thread on its circumferential sidewall. The size of the mounting plate is adapted to the inner diameter of the rainwater pipe. The inner wall of the upper end of the rainwater pipe has an internal thread adapted to the external thread. The mounting plate is threadedly connected to the rainwater pipe. The upper end of the fixing pipe passes through the mounting plate and is fixedly connected to the mounting plate. The fixing sleeve is fitted on the fixing pipe and connected to the mounting plate and the fixing pipe. Rotating the fixing sleeve causes the mounting plate to be detachably connected to the rainwater pipe.

[0012] Optionally, the upper end of the fixing pipe extends above the top of the downpipe, and the cross-section of the fixing pipe is polygonal.

[0013] Optionally, a clamp is provided at the connection between the hose and the downpipe.

[0014] The beneficial effects of this utility model are:

[0015] In this invention, the filter assembly can be inserted into or pulled out of the dewatering pipe through a fixing pipe. This allows the filter assembly to be removed for cleaning after long-term use, preventing clogging and ensuring the filtration effect of the filter assembly and maintaining the unobstructed water flow between the groundwater and the inlet pipe, thereby ensuring the normal operation of the foundation pit dewatering. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention during operation;

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 3 This is a top view of the assembly structure of the connector and the downpipe;

[0019] Figure 4 This is a structural diagram of the first filter plate.

[0020] Reference numerals: 1-Filter assembly, 101-First filter plate, 102-Second filter plate, 103-Filter hole, 2-Downflow pipe, 3-Fixing pipe, 4-Connector, 401-Mounting plate, 402-Fixing sleeve, 5-Clamp, 6-Hose, 7-Fixing ring, 8-Sealing ring, 9-Water passage hole. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0022] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example

[0025] A dewatering pipe for wellpoint dewatering of foundation pits includes dewatering pipes 2 distributed on the side of the foundation pit and connected to groundwater. The top of the dewatering pipe 2 is located above the foundation surface of the foundation pit. A filter assembly 1 is movably installed inside the dewatering pipe 2. A fixing pipe 3 is connected to the filter assembly 1 for inserting or removing the filter assembly 1 into the dewatering pipe 2. The fixing pipe 3 is open at the top and closed at the bottom. Several water passage holes 9 are provided on the side wall of the fixing pipe 3 above the filter assembly. A connector 4 is provided on the upper part of the fixing pipe 3 and detachably connected to the dewatering pipe 2. A flexible hose 6 connected to a water pump is sleeved on the open end of the fixing pipe 2.

[0026] In this embodiment, as Figure 1 As shown, the dewatering pipes 2 are generally distributed on the side of the foundation pit and connected to the groundwater, so that water can be pumped directly from areas with higher groundwater levels. The top of the dewatering pipes 2 is located above the foundation surface of the foundation pit, which facilitates installation and maintenance. The dewatering pipes 2 are equipped with a filter assembly 1 to prevent impurities in the groundwater (such as mud, sand, gravel, etc.) from entering the dewatering pipes 2, thereby protecting the water pump from damage. The filter assembly 1 is connected to a fixing pipe 3 for inserting or removing the filter assembly 1 into the dewatering pipes 2. The fixing pipe 3 is equipped with a connector 4 that can be detachably connected to the dewatering pipes 2. This facilitates quick replacement or cleaning of the filter assembly 1 when needed, avoids clogging of the filter assembly 1, ensures that the water passage between the groundwater and the dewatering pipes 2 is unobstructed, and guarantees the dewatering effect of the foundation pit wellpoint. During installation, the filter assembly 1 is first installed inside the dewatering pipe 2 through the fixed pipe 3 and the connector 4. The fixed pipe 3 is hollow inside. Then, a hose 6 is connected to the open end of the fixed pipe 3. The hose 6 is connected to a water pump. Under the action of the water pump, the groundwater passes through the filter assembly 1 and enters the fixed pipe 3 through the water passage hole 9 on the side wall of the fixed pipe 3. Finally, it is transported to the hose 6 through the open end and then pumped to the designated location by the water pump. During the dewatering process, the filter assembly 1 is checked regularly for blockage and cleaned or replaced as needed to ensure that the filter assembly 1 is not blocked and to ensure the normal operation of the foundation pit dewatering.

[0027] Furthermore, the filter assembly 1 is a multi-layer filter assembly 1, which includes a first filter plate 101 and a second filter plate 102. The first filter plate 101 is located below the second filter plate 102. Both the first filter plate 101 and the second filter plate 102 are provided with a plurality of filter holes 103. The diameter of the filter holes 103 on the first filter plate 101 is larger than the diameter of the filter holes 103 on the second filter plate 102. The middle parts of the first filter plate 101 and the second filter plate 102 are connected to the fixed tube 3.

[0028] Specifically, the first filter plate 101 is located at the bottom of the multi-layer filter assembly 1, but inside the downwater pipe 2, and is in direct contact with groundwater, such as... Figure 4 As shown, the first filter plate 101 has several filter holes 103 with relatively large diameters, mainly used for the initial filtration of larger impurities such as silt and gravel. The second filter plate 102 is located above the first filter plate 101, serving as a second layer of filtration. There is a certain gap between the first filter plate 101 and the second filter plate 102. The second filter plate 102 also has several filter holes 103, but their diameters are smaller than those on the first filter plate 101. In this way, the second filter plate 102 can further filter out smaller impurities such as fine sand and tiny particles, thereby ensuring that the water entering the rainwater pipe 2 is purer. The filter holes 103 on the first filter plate 101 and the second filter plate 102 have different diameters. This design enables graded filtration, that is, coarse filtration followed by fine filtration, gradually improving the filtration effect. The middle portions of both the first filter plate 101 and the second filter plate 102 are connected to the fixing pipe 3. The fixing pipe 3 can be welded to the filter plate to ensure a strong and stable connection. A stronger connection makes it easier to insert or remove the filter assembly 1 into the downcomer pipe 2. The lower end of the fixing pipe 3 passes through the second filter plate 102 and is then fixedly connected to the first filter plate 101. In this way, the fixing pipe 3 can drive the second filter plate 102 and the first filter plate 101 to move synchronously. The water passage hole 9 is located above the second filter plate 102.

[0029] Furthermore, the first filter plate 101 and the second filter plate 102 are circumferentially connected with a fixing ring 7, the size of which is adapted to the inner diameter of the downpipe 2.

[0030] Specifically, the fixing ring 7 fits tightly against the inner wall of the downcomer pipe 2, providing additional support for the first filter plate 101 and the second filter plate 102, preventing them from shifting or deforming under the impact of water flow. The fixing ring 7 is adapted to the inner diameter of the downcomer pipe 2, ensuring close contact between the filter assembly 1 and the downcomer pipe 2, reducing the possibility of water leakage from the gap between the filter assembly 1 and the downcomer pipe 2, thereby improving the filtration effect of the entire system.

[0031] Furthermore, a sealing ring 8 is embedded in the circumferential sidewall of the fixing ring 7.

[0032] Specifically, the sealing ring 8 fits tightly against the inner wall of the downpipe 2, effectively preventing water from leaking through the tiny gaps between the filter assembly 1 and the downpipe 2. This design further improves the sealing between the filter assembly 1 and the downpipe 2, minimizing the entry of impurities from the groundwater into the water pump. The downpipe 2 can be made of stainless steel to prevent internal rusting, which would affect the installation of the filter assembly 1.

[0033] Furthermore, the filter assembly 1 is positioned near the lower end of the rainwater pipe 2.

[0034] Specifically, placing the filter assembly 1 at the lower end of the downpipe 2 ensures that groundwater passes through the filter assembly 1 before entering the downpipe 2. Since the lower end of the downpipe 2 is usually in direct contact with the groundwater, this design maximizes the effective filtration area of ​​the downpipe 2, improving filtration efficiency. Impurities in the groundwater usually settle downwards with the water flow. Placing the filter assembly 1 at the lower end of the downpipe 2 makes it easier to filter out these impurities, thereby reducing the accumulation of impurities inside the downpipe 2 and preventing blockage at the lower end of the downpipe 2.

[0035] Furthermore, the connector 4 includes a mounting plate 401 and a fixing sleeve 402. The mounting plate 401 has an external thread on its circumferential side wall. The size of the mounting plate 401 is adapted to the inner diameter of the downpipe 2. The inner wall of the upper end of the downpipe 2 has an internal thread adapted to the external thread. The mounting plate 401 is threadedly connected to the downpipe 2. The upper end of the fixing pipe 3 passes through the mounting plate 401 and is fixedly connected to the mounting plate 401. The fixing sleeve 402 is sleeved on the fixing pipe 3 and connected to the mounting plate 401 and the fixing pipe 3. Rotating the fixing sleeve 402 causes the mounting plate 401 to be detachably connected to the downpipe 2.

[0036] Specifically, such as Figure 3As shown, the mounting plate 401 is an annular component with external threads on its circumferential sidewall. Its size is adapted to the inner diameter of the downpipe 2. The external thread of the mounting plate 401 matches the internal thread on the upper inner wall of the downpipe 2, so that the mounting plate 401 can be threadedly connected to the downpipe 2 by rotation. When the mounting plate 401 is connected to the downpipe 2, a sealing ring can be sandwiched between the two to ensure that all groundwater can enter the fixed pipe 3 from the water passage hole 9 and be extracted. The thread on the inner wall of the downpipe 2 only needs to be set at the upper part. The fixing sleeve 402 is fitted onto the fixing pipe 3. The bottom surface of the fixing sleeve 402 is connected to the top surface of the mounting plate 401, and the fixing sleeve 402 is also connected to the side wall of the fixing pipe 3. This allows the mounting plate 401 and the fixing pipe 3 to rotate together when the fixing sleeve 402 is rotated. The fixing pipe 3 is a key component for connecting the filter assembly 1. It passes through the downcomer pipe 2 and is connected to the filter assembly 1. By rotating the fixing sleeve 402, the mounting plate 401 can be rotated, thereby realizing the threaded connection or disassembly between the mounting plate 401 and the downcomer pipe 2. Similarly, by rotating the fixing sleeve 402 in the opposite direction, the threaded disassembly between the mounting plate 401 and the downcomer pipe 2 can be easily realized, thereby facilitating the removal of the filter assembly 1 from the downcomer pipe 2 for cleaning or replacement, or allowing for direct backwashing.

[0037] The specific installation method of filter assembly 1 is as follows: The worker first inserts two filter plates into the downwater pipe 2 through the upper opening. Then, a downward vertical force is applied to the fixing pipe 3, causing the two filter plates to move downwards until the mounting plate 401 contacts the internal thread of the downwater pipe 2. Next, the upper end of the fixing pipe 3 is tightened with a wrench, causing the mounting plate 401 to rotate and connect with the threaded connection of the fixing pipe 2. When the upper end of the fixing pipe 3 is approximately 10cm above the downwater pipe 2, the rotation of the fixing sleeve 402 is stopped. At this point, the two filter plates are exactly positioned at the lower end of the downwater pipe 2. Of course, this requires selecting an appropriate length beforehand based on the length of the downwater pipe 2. When the distance between the upper end of the fixed pipe 3 and the upper end of the downdraft pipe 2 is about 10cm, the filter assembly 1 is basically located at the lower end of the downdraft pipe 2. After the two filter plates are installed in place, the hose 6 is then fitted onto the opening at the top of the fixed pipe 3 and locked with the clamp 5. The other end of the hose 6 is connected to the water pump. At this time, the pit dewatering operation can be carried out. When the filter plates need to be cleaned later, the hose 6 is removed from the fixed pipe 3, and then the fixing sleeve 402 is rotated in the opposite direction with a wrench until the mounting plate 401 is separated from the downdraft pipe 2. Then the filter assembly 1 can be pulled out by directly holding the fixed pipe 3, which is convenient for subsequent cleaning operations.

[0038] Furthermore, the upper end of the fixing pipe 3 extends above the top of the downcomer pipe 2, and the cross-section of the fixing sleeve 402 is polygonal. The fixing pipe 3 needs to extend a certain distance above the top of the downcomer pipe 2, and the cross-section of the fixing sleeve 402 is polygonal. The polygon can be a square, a regular pentagon, or a regular hexagon. In this embodiment, the cross-section of the fixing sleeve 402 adopts a regular pentagonal structure, which makes it easier to tighten and loosen the fixing sleeve 402 with a wrench, making the installation and removal of the filter assembly 1 easier.

[0039] Furthermore, a clamp 5 is provided at the connection between the hose 6 and the downpipe 2. The clamp 5 is a commonly available water pipe clamp 5, which can be purchased directly from the market. The clamp 5 locks the hose 6 to the opening at the top of the fixed pipe 3 to prevent it from falling off.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A dewatering pipe for dewatering of a foundation pit well, comprising dewatering pipes (2) distributed on the side of the foundation pit and in communication with groundwater, the top end of the dewatering pipes (2) being located above the foundation surface of the foundation pit, characterized in that, The filter assembly (1) is arranged in the downspout (2).

2. The dewatering pipe for dewatering of a foundation pit well according to claim 1, characterized in that, The filter assembly (1) is a multilayer filter assembly (1), which comprises a first filter plate (101) and a second filter plate (102), the first filter plate (101) is arranged below the second filter plate (102), a plurality of filter holes (103) are arranged on the first filter plate (101) and the second filter plate (102), the filter holes (103) on the first filter plate (101) have a larger diameter than the filter holes (103) on the second filter plate (102), and the first filter plate (101) and the second filter plate (102) are connected to the fixed tube (3) at the middle portions.

3. The dewatering pipe for dewatering of a foundation pit well according to claim 2, characterized in that, The first filter plate (101) and the second filter plate (102) are circumferentially connected to a fixing ring (7), and the size of the fixing ring (7) is matched with the inner diameter of the downspout (2).

4. The dewatering pipe for dewatering of a foundation pit well according to claim 3, characterized in that, The circumferential sidewall of the fixing ring (7) is embedded with a sealing ring (8).

5. The dewatering pipe for dewatering of a foundation pit well according to claim 2, characterized in that, The filter assembly (1) is arranged at a position adjacent to the lower end of the downspout (2).

6. The dewatering pipe for dewatering of a foundation pit well according to claim 1, characterized in that, The connecting piece (4) comprises a mounting plate (401) and a fixing sleeve (402), the circumferential sidewall of the mounting plate (401) is provided with external threads, the size of the mounting plate (401) is matched with the inner diameter of the downspout (2), the inner wall of the upper end of the downspout (2) is provided with internal threads matched with the external threads, the mounting plate (401) is threadedly connected to the downspout (2), the upper end of the fixed tube (3) penetrates through the mounting plate (401) and is fixedly connected to the mounting plate (401), the fixing sleeve (402) is sleeved on the fixed tube (3) and is connected to the mounting plate (401) and the fixed tube (3), and rotating the fixing sleeve (402) drives the mounting plate (401) to be detachably connected to the downspout (2).

7. The dewatering pipe for dewatering of a foundation pit well according to claim 6, characterized in that, The upper end of the fixed tube (3) is higher than the top end of the downspout (2), and the cross section of the fixing sleeve (402) is polygonal.

8. The dewatering pipe for dewatering of a foundation pit well according to claim 1, characterized in that, The hose (6) is provided with a clamp (5) at the connection position with the downspout (2).

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