Anti-clogging foundation pit dewatering system and method

Abstract

This invention discloses an anti-clogging foundation pit dewatering system, comprising an outlet pipe, a dewatering pipe, and a filter assembly. The dewatering pipe is inserted into the foundation pit, and its top end is connected to a pumping mechanism via the outlet pipe. The filter assembly is disposed within the dewatering pipe and includes an upper ring, a lower ring, and a mesh. The lower ring is fixedly connected to the inner wall of the dewatering pipe. The upper ring is movably disposed within the dewatering pipe and has an elastic restoring element between it and the pipe. The mesh is connected between the upper and lower rings, and its mesh size gradually decreases from bottom to top, allowing the upper part of the mesh to become clogged before the lower part. A telescopic drive is provided within the outlet pipe, and its driving end is connected to the upper ring, driving the upper ring to move up and down to pull the mesh along the axial direction of the dewatering pipe. An anti-clogging foundation pit dewatering method is also disclosed. This anti-clogging foundation pit dewatering system and method achieve timely unblocking, solve the clogging problem, and prevent the dewatering function from failing.

Description

Technical Field

[0001] This invention relates to the field of foundation pit dewatering technology, specifically to a foundation pit dewatering system and method for preventing clogging. Background Technology

[0002] During the excavation of foundation pits, lightweight wellpoint dewatering methods are often used to keep the bottom of the pit dry. Traditional wellpoint pipes have a complex lower filter pipe structure, usually consisting of a perforated steel pipe, multiple layers of internal filter screen, and an external protective frame, and are connected to the upper well pipe by pipe clamps.

[0003] Chinese patent application No. 202410384915.0 discloses a foundation pit dewatering support device and construction method, which includes a dewatering well, a filter pipe, a water delivery pipe, pumping equipment, a cleaning cylinder, and a support cylinder. The filter pipe is located inside the dewatering well, and its outer circumferential wall has several filter holes. The top of the filter pipe is connected to the water delivery pipe, which extends out of the dewatering well and is connected to the pumping equipment. The dewatering well is filled with a first coarse sand layer and a clay layer. The cleaning cylinder is connected above the filter pipe by a telescopic rod. The inner diameter of the cleaning cylinder is the same as the outer diameter of the filter pipe, and a tie rod is provided on the cleaning cylinder. The support cylinder is sleeved on the outside of the cleaning cylinder. The top of the support cylinder has a tie sleeve that extends out of the dewatering well and is fixed to the dewatering well. The tie sleeve is connected to the inside of the support cylinder, and the tie rod extends out from the tie sleeve. This application... The system employs a multi-layered filtration system, consisting of a first coarse sand layer, a second coarse sand layer, a mesh bag, and a filter pipe, to reduce the silt content in the pumped water and protect the pumping equipment. However, this foundation pit dewatering support device and construction method have the following shortcomings: the fixed mesh bag is prone to clogging, causing the dewatering function to fail. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an anti-blockage foundation pit dewatering system and method that can achieve timely dredging, solve blockage problems, and avoid the failure of the dewatering function.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A dewatering system for preventing clogging in foundation pits includes an outlet pipe, a dewatering pipe, and a filter assembly. The dewatering pipe is inserted into the foundation pit, and a pumping mechanism is connected to the top of the dewatering pipe via the outlet pipe. The filter assembly is disposed in the dewatering pipe and includes an upper ring body, a lower ring body, and a mesh body with adjustable mesh size. The lower ring body is fixedly connected to the inner wall of the dewatering pipe. The upper ring body is movably disposed within the dewatering pipe and has an elastic recovery component between it and the dewatering pipe. The mesh body is connected between the upper and lower ring bodies, and the mesh size of the mesh body gradually decreases from bottom to top, so that the upper part of the mesh body can be clogged before the lower part. A telescopic drive component is provided in the outlet pipe, and the driving end of the telescopic drive component is connected to the upper ring body to drive the upper ring body to move up and down to pull the mesh body to move axially along the dewatering pipe.

[0006] As a further improvement to the above technical solution: The rainwater pipe is equipped with a conduit located above the upper ring body. The upper ring body is equipped with a connecting shaft that is slidably connected to the conduit. The elastic recovery element is located between the upper ring body and the conduit.

[0007] The conduit is coaxial with the downpipe, and the outer diameter of the conduit is smaller than the inner diameter of the downpipe. The elastic recovery element is a spring sleeved on the connecting shaft.

[0008] The outer wall of the conduit is fixed to the inner wall of the downpipe by a fixing rod, and the telescopic drive is provided on the conduit.

[0009] The top of the connecting shaft is provided with a piston head, which is slidably sleeved with the conduit.

[0010] The upper surface of the upper ring body is provided with multiple connecting rods arranged at center intervals, and the top end of the connecting rods is connected to the connecting shaft.

[0011] The mesh is formed by polyurethane weaving.

[0012] The telescopic drive component is a telescopic air cylinder, a telescopic hydraulic cylinder, or a telescopic electric cylinder.

[0013] The anti-clogging foundation pit dewatering system also includes a control module. A pressure sensor is provided above and / or below the filter assembly on the dewatering pipe. The control module is signal-connected to both the pressure sensor and the telescopic drive component, and is used to determine the clogging status of the filter assembly based on the pressure signal from the pressure sensor in order to drive the telescopic drive component to extend and retract.

[0014] A method for preventing clogging in foundation pits, using the aforementioned anti-clogging foundation pit dewatering system, includes the following steps: S1. The pumping mechanism starts pumping water; S2. When the upper part of the net is blocked, under the action of the water pressure below, the upper part of the net overcomes the elastic force of the elastic recovery element and moves the lower part upward to expand the mesh size of each part of the net, so as to clear the blockage in the upper part of the net; after the net is cleared, the upper ring moves downward under the elastic force of the elastic recovery element, so that the net returns to its initial length. S3. The control module receives the pressure signal from the pressure sensor in real time and determines the clogging status of the filter assembly based on the pressure signal. When the pressure detected by the pressure sensor exceeds the set pressure and set time, the control module determines that the filter assembly is clogged and starts the telescopic drive to drive the mesh to reciprocate and extend, thereby accelerating the unclogging of the mesh through the squeezing and stretching action. When the pressure detected by the pressure sensor returns to below the set pressure, the control module determines that the filter assembly is not clogged and shuts off the telescopic drive, allowing the drive end of the telescopic drive to extend and retract freely.

[0015] Compared with the prior art, the advantages of the present invention are as follows: The anti-clogging foundation pit dewatering system of this invention, on the one hand, features a retractable and adjustable filter screen assembly with adjustable mesh size. When clogged, the assembly automatically extends to enlarge the mesh, clearing blockages and achieving an automatic unblocking effect, effectively solving the clogging problem. On the other hand, it can cooperate with a pressure sensor and control module to accelerate the unblocking process by reciprocating the mesh's extension and retraction, ensuring that the mesh does not become clogged for extended periods. In summary, through the coordinated action of automatic water pressure unblocking and the extension / retraction drive, timely unblocking is achieved, resolving clogging issues and preventing the dewatering function from failing.

[0016] The anti-clogging pit dewatering method of the present invention, on the one hand, utilizes a retractable and adjustable filter screen assembly to enlarge the mesh size and automatically extend when clogged, thereby clearing the blockage and achieving an automatic unblocking effect, effectively solving the clogging problem. On the other hand, it can cooperate with a pressure sensor and control module to accelerate the unblocking of the mesh through reciprocating extension and retraction, ensuring that the mesh does not become clogged for extended periods. In summary, by combining automatic water pressure unblocking with the control of the extension and retraction drive, timely unblocking is achieved, solving the clogging problem and preventing the dewatering function from failing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the anti-clogging foundation pit dewatering system of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the filter screen assembly of the anti-clogging foundation pit dewatering system of the present invention.

[0019] Figure 3 This is a schematic diagram of the filter screen assembly of the anti-clogging foundation pit dewatering system of the present invention at its initial length.

[0020] Figure 4This is a schematic diagram of the filter screen assembly of the anti-clogging foundation pit dewatering system of the present invention in the state of clogging and elongation.

[0021] The labels in the diagram represent: 1. Outlet pipe; 2. Downflow pipe; 21. Conduit; 22. Outer wall via fixing rod; 3. Filter screen assembly; 31. Upper ring body; 311. Connecting shaft; 312. Piston head; 313. Connecting rod; 32. Lower ring body; 33. Mesh body; 4. Foundation pit; 5. Pumping mechanism; 6. Elastic recovery component; 7. Telescopic drive component. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this invention 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 invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Example 1: Figures 1 to 4This invention illustrates an embodiment of the anti-clogging foundation pit dewatering system. The system includes an outlet pipe 1, a dewatering pipe 2, and a filter assembly 3. The dewatering pipe 2 is inserted into the foundation pit 4. The top end of the dewatering pipe 2 is connected to a pumping mechanism 5 via the outlet pipe 1. The filter assembly 3 is disposed within the dewatering pipe 2 and includes an upper ring 31, a lower ring 32, and a retractable mesh 33 with adjustable mesh size. The lower ring 32 is fixed to the inner wall of the dewatering pipe 2. The upper ring body 31 is movably installed inside the downpipe 2 and an elastic recovery member 6 is provided between it and the downpipe 2. The net body 33 is connected between the upper ring body 31 and the lower ring body 32. The mesh size of the net body 33 gradually decreases from bottom to top, so that the upper part of the net body 33 can be blocked before the lower part. The outlet pipe 1 is provided with a telescopic drive member 7. The drive end of the telescopic drive member 7 is connected to the upper ring body 31 and is used to drive the upper ring body 31 to move up and down to pull the net body 33 to move along the axial direction of the downpipe 2.

[0027] In use, a pressure sensor is installed above and / or below the filter assembly 3 on the downpipe 2. The control module is connected to both the pressure sensor and the telescopic drive component 7. The specific process is as follows: the pumping mechanism 5 starts pumping; when the upper part of the net body 33 is blocked, under the action of the lower water pressure, the upper part of the net body 33 overcomes the elastic force of the elastic recovery component 6, causing the lower part to extend upwards. Figure 4 As shown, the mesh size of each part of the mesh body 33 is enlarged to clear the blockage in the upper part of the mesh body 33; after the mesh body 33 is cleared, the upper ring body 31 moves downward under the elastic force of the elastic recovery member 6, so that the mesh body 33 returns to its initial length, as shown. Figure 3 As shown; the control module receives the pressure signal from the pressure sensor in real time and determines the blockage status of the filter assembly 3 based on the pressure signal. When the pressure detected by the pressure sensor exceeds the set pressure and set time, the control module determines that the filter assembly 3 is blocked and starts the telescopic drive 7 to drive the mesh 33 to reciprocate telescopic movement, thereby accelerating the unblocking of the mesh 33 through the squeezing and stretching action. When the pressure detected by the pressure sensor returns to below the set pressure, the control module determines that the filter assembly 3 is not blocked and closes the telescopic drive 7, allowing the drive end of the telescopic drive 7 to extend and retract freely.

[0028] This anti-clogging foundation pit dewatering system, on the one hand, utilizes an adjustable filter screen assembly 3 with retractable mesh size. When clogged, it automatically extends to enlarge the mesh size of the screen 33, thus clearing the blockage and achieving an automatic unblocking effect, effectively solving the clogging problem. On the other hand, it can work in conjunction with a pressure sensor and control module to accelerate the reciprocating extension and retraction of the screen 33, ensuring that the screen 33 does not become clogged for extended periods. In short, through the automatic water pressure unblocking and the coordinated unblocking control of the extension and retraction drive 7, timely unblocking is achieved, resolving the clogging problem and preventing the dewatering function from failing.

[0029] Furthermore, in this embodiment, the downwater pipe 2 is provided with a conduit 21, which is located above the upper ring body 31. The upper ring body 31 is provided with a connecting shaft 311, which is slidably sleeved with the conduit 21. An elastic recovery member 6 is provided between the upper ring body 31 and the conduit 21. The upper ring body 31 moves up and down along the axial direction of the conduit 21 with the connecting shaft 311, pulling the mesh body 33 upward to achieve the effect of enlarging the mesh opening. Preferably, the downwater pipe 2 is arranged vertically, the conduit 21 is coaxially arranged with the downwater pipe 2, and the upper ring body 31 is slidably adapted to the inner wall of the downwater pipe 2.

[0030] Furthermore, such as Figure 2 As shown, in this embodiment, the filter assembly 3 has multiple layers from bottom to top, with the mesh size of the lower layer being larger than that of the upper layer. Preferably, the mesh body 33 is formed by polyurethane weaving.

[0031] Furthermore, in this embodiment, the conduit 21 is coaxial with the downcomer 2, and the outer diameter of the conduit 21 is smaller than the inner diameter of the downcomer 2. The elastic recovery member 6 is a spring sleeved on the connecting shaft 311. Preferably, the bottom of the connecting shaft 311 is provided with an outer protruding ring, and the spring abuts against the outer protruding ring and the conduit 21.

[0032] Furthermore, in this embodiment, the outer wall of the conduit 21 is fixed to the inner wall of the downpipe 2 by a fixing rod 22, and the telescopic drive 7 is disposed on the conduit 21. Preferably, the telescopic drive 7 is a telescopic cylinder, a telescopic hydraulic cylinder, or a telescopic electric cylinder.

[0033] Furthermore, in this embodiment, a piston head 312 is provided at the top of the connecting shaft 311, and the piston head 312 is slidably sleeved with the conduit 21.

[0034] Furthermore, in this embodiment, the upper surface of the upper ring body 31 is provided with a plurality of connecting rods 313 arranged at intervals along the center line, and the top end of the connecting rods 313 is connected to the connecting shaft 311.

[0035] Furthermore, in this embodiment, the anti-clogging foundation pit dewatering system also includes a control module. A pressure sensor is provided above and / or below the filter assembly 3 on the dewatering pipe 2. The control module is signal-connected to both the pressure sensor and the telescopic drive 7, and is used to determine the clogging status of the filter assembly 3 based on the pressure signal from the pressure sensor to drive the telescopic drive 7 to extend and retract. The control module receives the pressure signal from the pressure sensor in real time and determines the clogging status of the filter assembly 3 based on the pressure signal. When the pressure detected by the pressure sensor exceeds the set pressure and set time, the control module determines that the filter assembly 3 is clogged and activates the telescopic drive 7 to drive the mesh 33 to reciprocate and extend, accelerating the unclogging of the mesh 33 through compression and stretching. When the pressure detected by the pressure sensor returns to below the set pressure, the control module determines that the filter assembly 3 is not clogged and closes the telescopic drive 7, allowing the drive end of the telescopic drive 7 to extend and retract freely. Example 2: A method for preventing clogging in foundation pits, using the anti-clogging foundation pit dewatering system of Example 1, includes the following steps: S1, Pumping mechanism 5 starts pumping; S2. When the upper part of the net body 33 is blocked, under the action of the lower water pressure, the upper part of the net body 33 overcomes the elastic force of the elastic recovery member 6 and moves upward to expand the mesh size of each part of the net body 33, so that the blockage in the upper part of the net body 33 is cleared; after the net body 33 is cleared, the upper ring 31 moves downward under the elastic force of the elastic recovery member 6, so that the net body 33 returns to its initial length. S3. The control module receives the pressure signal from the pressure sensor in real time and determines the blockage status of the filter assembly 3 based on the pressure signal. When the pressure detected by the pressure sensor exceeds the set pressure for a set time, the control module determines that the filter assembly 3 is blocked and starts the telescopic drive 7 to drive the mesh 33 to reciprocate and extend, thereby accelerating the unblocking of the mesh 33 through the squeezing and stretching action. When the pressure detected by the pressure sensor returns to below the set pressure, the control module determines that the filter assembly 3 is not blocked and closes the telescopic drive 7, allowing the drive end of the telescopic drive 7 to extend and retract freely.

[0036] This anti-clogging pit dewatering method has two main aspects. First, the filter screen assembly 3 has an adjustable mesh size, which automatically extends to enlarge the mesh size of the screen body 33 when clogged, thus clearing the blockage and achieving an automatic unblocking effect. Second, it can work with a pressure sensor and control module to make the screen body 33 reciprocate to accelerate the unblocking process and ensure that the screen body 33 does not become clogged for a long time. In short, through the automatic unblocking by water pressure and the control of the extension and retraction drive component 7, timely unblocking is achieved, the blockage problem is solved, and the dewatering function is prevented from failing.

[0037] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A dewatering system for preventing clogging in foundation pits, characterized in that: The system includes an outlet pipe (1), a downwater pipe (2), and a filter assembly (3). The downwater pipe (2) is inserted into the foundation pit (4). The top of the downwater pipe (2) is connected to a pumping mechanism (5) through the outlet pipe (1). The filter assembly (3) is located in the downwater pipe (2) and includes an upper ring body (31), a lower ring body (32), and a retractable mesh body (33) with adjustable mesh size. The lower ring body (32) is fixedly connected to the inner wall of the downwater pipe (2), and the upper ring body (31) is movably positioned in the downwater pipe. An elastic recovery element (6) is provided inside the pipe (2) and between it and the rainwater pipe (2). The net body (33) is connected between the upper ring body (31) and the lower ring body (32). The mesh size of the net body (33) gradually decreases from bottom to top, so that the upper part of the net body (33) can be blocked before the lower part. A telescopic drive element (7) is provided inside the water outlet pipe (1). The drive end of the telescopic drive element (7) is connected to the upper ring body (31) and is used to drive the upper ring body (31) to move up and down to pull the net body (33) to move along the axial direction of the rainwater pipe (2).

2. The anti-clogging foundation pit dewatering system according to claim 1, characterized in that: The rainwater pipe (2) is provided with a conduit (21), which is located above the upper ring body (31). The upper ring body (31) is provided with a connecting shaft (311), which is slidably connected to the conduit (21). The elastic recovery member (6) is located between the upper ring body (31) and the conduit (21).

3. The anti-clogging foundation pit dewatering system according to claim 2, characterized in that: The conduit (21) is coaxial with the rainwater pipe (2), and the outer diameter of the conduit (21) is smaller than the inner diameter of the rainwater pipe (2). The elastic recovery member (6) is a spring sleeved on the connecting shaft (311).

4. The anti-clogging foundation pit dewatering system according to claim 3, characterized in that: The outer wall of the conduit (21) is fixed to the inner wall of the downpipe (2) by a fixing rod (22), and the telescopic drive (7) is provided on the conduit (21).

5. The anti-clogging foundation pit dewatering system according to claim 3, characterized in that: The top of the connecting shaft (311) is provided with a piston head (312), which is slidably sleeved with the conduit (21).

6. The anti-clogging foundation pit dewatering system according to claim 1, characterized in that: The upper surface of the upper ring (31) is provided with a plurality of connecting rods (313) arranged at center intervals, and the top end of the connecting rods (313) is connected to the connecting shaft (311).

7. The anti-clogging foundation pit dewatering system according to claim 1, characterized in that: The mesh (33) is formed by polyurethane weaving.

8. The anti-clogging foundation pit dewatering system according to claim 1, characterized in that: The telescopic drive component (7) is a telescopic cylinder, a telescopic hydraulic cylinder, or a telescopic electric cylinder.

9. The anti-clogging foundation pit dewatering system according to any one of claims 1 to 8, characterized in that: The anti-clogging pit dewatering system also includes a control module. The dewatering pipe (2) is provided with a pressure sensor above and / or below the filter assembly (3). The control module is signal connected to both the pressure sensor and the telescopic drive (7) and is used to determine the clogging status of the filter assembly (3) based on the pressure signal from the pressure sensor in order to drive the telescopic drive (7) to telescopically move.

10. A method for preventing clogging in foundation pits through dewatering, characterized in that, The dewatering system for the foundation pit, as described in claim 9, includes the following steps: S1, The pumping mechanism (5) starts pumping; S2. When the upper part of the net (33) is blocked, under the action of the water pressure below, the upper part of the net (33) overcomes the elastic force of the elastic recovery member (6) and moves upward to expand the mesh size of each part of the net (33) so that the blockage in the upper part of the net (33) is cleared. After the net (33) is cleared, the upper ring (31) moves downward under the elastic force of the elastic recovery member (6) so that the net (33) returns to its initial length. S3. The control module receives the pressure signal from the pressure sensor in real time and judges the blockage of the filter assembly (3) based on the pressure signal from the pressure sensor. When the pressure detected by the pressure sensor exceeds the set pressure and set time, the control module drives the filter assembly (3) to be blocked and starts the telescopic drive (7) to drive the mesh (33) to reciprocate and extend. The mesh (33) is cleared faster by squeezing and stretching. When the pressure detected by the pressure sensor returns to below the set pressure, the control module drives the filter assembly (3) to be unblocked and closes the telescopic drive (7) so that the drive end of the telescopic drive (7) can extend and retract freely.

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