A deep foundation pit construction dewatering anti-backflow device

Abstract

The utility model discloses a kind of deep foundation pit construction dewatering anti-inversion devices, it is related to building engineering technical field, including water suction pipe, the inside fixed mounting of water suction pipe is equipped with mounting ring, the inner wall fixed mounting of mounting ring is equipped with mounting piece, abutment on the mounting piece is the plug block compatible with mounting piece, in the utility model, when normal dewatering, submersible pump starts to produce upward water flow force, impact plug block overcomes reset spring elasticity, along mounting piece inclined concave surface moves upward, forms passageway, groundwater is drained through dewatering well pipe, submersible pump enters water suction pipe and discharges.When submersible pump stops or appears inversion risk, reset spring pushes plug block to move down, and is closely abutted with mounting piece, combined with plug block self weight and counterweight block effect enhances sealing, blocks water body inversion passageway.Guide telescopic link ensures that plug block moves vertically and stably, protective sleeve protects guide telescopic link and reset spring from impurities effect.Through multiple sealing guarantee, effectively avoid the security risk caused by inversion of foundation pit.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, specifically to a device for preventing backflow during dewatering in deep foundation pit construction. Background Technology

[0002] Deep foundation pits refer to foundation pits in construction projects that are excavated to a certain depth and scale for underground structure construction (such as basements, underground garages, bridge foundations, etc.). In the industry, foundation pits with an excavation depth exceeding 5 meters (including 5 meters), or those with complex geological conditions and sensitive surrounding environments (such as adjacent buildings or underground pipelines) even if they do not exceed 5 meters, are generally defined as deep foundation pits. Their core characteristics are large excavation depth, complex soil stress variations, and susceptibility to factors such as groundwater and soil stability during construction. They require specialized support, dewatering, and other safety measures, making them a critical aspect of underground engineering construction.

[0003] During deep foundation pit construction, to ensure construction safety and a dry working environment, groundwater in and around the pit needs to be pumped out using dewatering equipment to lower the groundwater level. However, some current dewatering devices only have a single drainage function and lack reliable backflow prevention structures. When submersible pumps stop due to maintenance, power outages, or when an abnormal rise in the external groundwater level creates a pressure difference, external water can easily flow back into the foundation pit through the pumping pipes and dewatering wells. This backflow phenomenon leads to increased water accumulation in the foundation pit, increasing the soil's moisture content and reducing its strength. This not only destroys the results of previous dewatering but may also cause safety problems such as slope instability and foundation heave, affecting construction progress. It also increases equipment wear and tear and construction costs, making it difficult to meet the stable backflow prevention requirements for dewatering in deep foundation pit construction. Utility Model Content

[0004] The purpose of this invention is to provide a device for preventing backflow during dewatering in deep foundation pit construction, in order to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides a deep foundation pit construction dewatering and backflow prevention device, including a pumping pipe, an installation ring fixedly installed inside the pumping pipe, an installation component fixedly installed on the inner wall of the installation ring, a plug that fits the installation component abutting against the installation component, the installation component is an annular disc structure, the whole is a bowl-shaped ring that fits the plug, a through hole is provided in the center for water flow, and its inner side has an inclined concave surface that fits the inclined surface of the outer side of the plug. The installation component abuts against the conical outer wall of the plug to achieve a shape fit and ensure smooth flow of water. Two connecting rods are fixedly installed on the top of the plug, and a guide telescopic rod and a return spring are fixedly installed between the installation ring and the connecting rods. The return spring is sleeved on the outside of the guide telescopic rod.

[0006] Furthermore, a protective sleeve is installed between the mounting ring and the connecting rod, and the protective sleeve is fitted over the guide telescopic rod and the return spring.

[0007] Furthermore, the outer wall of the protective sleeve is corrugated, and the material of the protective sleeve is rubber.

[0008] Furthermore, a circular counterweight is installed on the block, and the outer wall of the block and the inner wall of the mounting component are both integrally formed with a rubber layer.

[0009] Furthermore, the vertical cross-section of the connecting rod is set as an isosceles triangle, and the two connecting rods are arranged in a cross shape.

[0010] Furthermore, a dewatering well pipe is connected to the bottom of the pumping pipe, and a submersible pump is installed at the connection between the pumping pipe and the dewatering well pipe. The submersible pump is installed on the outer wall of the dewatering well pipe, and a ring is fixedly installed on the outer wall of both the pumping pipe and the outer wall of the dewatering well pipe. A hexagonal bolt is threaded to the top of the ring.

[0011] Furthermore, a filter cover is installed on the outside of the dewatering well pipe, and the filter cover is equipped with a stainless steel filter screen, a non-woven fabric filter layer, and a fine sand filter layer from the outside to the inside.

[0012] Furthermore, a fixing ring is fixedly installed on the top of the water filter cover, and multiple fixing bolts are threaded onto the outer circumference of the fixing ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this utility model, during normal precipitation, the submersible pump starts, generating upward water flow force that impacts the plug block, overcoming the spring force of the return spring. The plug block moves upward along the inclined concave surface of the mounting component, forming a channel. Groundwater then flows through the precipitation well pipe and the submersible pump into the pumping pipe for discharge. When the submersible pump stops or there is a risk of backflow, the return spring pushes the plug block downward, making it tightly contact with the mounting component. The combination of the plug block's own weight and the counterweight enhances the seal, blocking the backflow channel. The guide telescopic rod ensures the plug block moves vertically and smoothly, and the protective sleeve protects the guide telescopic rod and return spring from impurities. Through multiple sealing measures, safety hazards caused by backflow in the foundation pit are effectively avoided.

[0015] 2. In this utility model, the outer wall of the protective sleeve is corrugated and made of rubber. The elasticity of the rubber allows it to adapt to the extension and retraction of the guide telescopic rod and the return spring. The corrugated design further enhances its flexibility in stretching and compression. At the same time, the rubber material has good sealing and wear resistance, which can effectively prevent mud and water from entering, protect the internal components, extend the service life of the protective sleeve itself, the guide telescopic rod, and the return spring, and ensure the stable operation of the device. Attached Figure Description

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

[0017] Figure 2 This is a schematic diagram of the connection structure between the guide telescopic rod and the return spring in this utility model;

[0018] Figure 3 for Figure 1 Enlarged view of the structure at point A in the middle;

[0019] Figure 4 for Figure 1 Enlarged view of the structure at point B.

[0020] In the diagram: 1. Pumping pipe; 2. Dewatering well pipe; 3. Mounting ring; 4. Mounting component; 5. Plug; 6. Connecting rod; 7. Guide telescopic rod; 8. Return spring; 9. Protective sleeve; 10. Counterweight; 11. Fixing ring; 12. Fixing bolt; 13. Stainless steel filter screen; 14. Non-woven filter layer; 15. Fine sand filter layer; 16. Circular ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4 This utility model provides a technical solution:

[0023] See Figures 1-4 As shown, a deep foundation pit construction dewatering and backflow prevention device includes a pumping pipe 1, an installation ring 3 fixedly installed inside the pumping pipe 1, an installation component 4 fixedly installed on the inner wall of the installation ring 3, and a plug 5 adapted to the installation component 4 abutting against the installation component 4. The installation component 4 is an annular disc structure, and the whole is a bowl-shaped ring that fits with the plug 5. A through hole is provided in the center for water to flow through. Its inner side has an inclined concave surface adapted to the inclined surface of the outer side of the plug 5. The installation component 4 abuts against the conical outer wall of the plug 5 to achieve a matching fit in shape, while ensuring smooth flow of water up and down. Two connecting rods 6 are fixedly installed on the top of the plug 5. A guide telescopic rod 7 and a return spring 8 are fixedly installed between the installation ring 3 and the connecting rods 6. The return spring 8 is sleeved on the outside of the guide telescopic rod 7.

[0024] During normal rainfall, the submersible pump starts, generating upward water flow. The water flow impacts the block 5, causing it to overcome the elastic force of the return spring 8 and move upward along the inclined concave surface of the mounting part 4. At this time, a channel is formed between the block 5 and the mounting part 4, and groundwater enters the pumping pipe 1 through the rainwater well pipe 2 and the submersible pump, and is then smoothly discharged through this channel.

[0025] When the submersible pump stops or there is a risk of backflow, the return spring 8 returns to its original deformation, pushing the plug 5 downward so that it comes into tight contact with the inclined concave surface of the mounting piece 4. At the same time, the weight of the plug 5 itself and the counterweight 10 further enhance the sealing effect, thereby blocking the channel for external water to flow back into the foundation pit.

[0026] The guide telescopic rod 7 guides the movement of the plug block 5, ensuring that it moves smoothly in a vertical direction and preventing it from shifting and affecting the sealing effect. The protective sleeve 9 protects the guide telescopic rod 7 and the return spring 8, preventing impurities such as mud and sand from entering and avoiding component failure due to blockage. Through the matching structure between the plug block 5 and the mounting part 4, the elastic return of the return spring 8, and the gravity assistance of the counterweight 10, multiple sealing guarantees are formed, effectively blocking reverse water flow and preventing safety hazards such as slope instability and foundation heave caused by backflow in the foundation pit.

[0027] See Figure 2-3 A protective sleeve 9 is installed between the mounting ring 3 and the connecting rod 6. The protective sleeve 9 is fitted over the outside of the guide telescopic rod 7 and the return spring 8.

[0028] The protective sleeve 9 is fitted over the guide telescopic rod 7 and the return spring 8 to prevent mud, sand and debris from entering them, thus preventing the guide telescopic rod 7 from being stuck due to impurities and unable to extend or retract normally. At the same time, it protects the return spring 8 from external corrosion, extends its service life, and ensures that the components between the mounting ring 3 and the connecting rod 6 can operate stably, thereby ensuring the normal opening and closing of the block 5 and maintaining the reliability of the device's anti-backflow and rainwater functions.

[0029] See Figure 3 The outer wall of the protective sleeve 9 is corrugated, and the material of the protective sleeve 9 is rubber.

[0030] The outer wall of the protective sleeve 9 is corrugated and made of rubber. The elasticity of the rubber allows it to adapt to the extension and retraction of the guide telescopic rod 7 and the return spring 8. The corrugated design further enhances its flexibility in stretching and compression. At the same time, the rubber material has good sealing and wear resistance, which can effectively prevent mud and water from entering, protect internal components, extend the service life of the protective sleeve 9 itself, the guide telescopic rod 7, and the return spring 8, and ensure the stable operation of the device.

[0031] See Figure 2A round counterweight 10 is installed on the block 5. The outer wall of the block 5 and the inner wall of the mounting part 4 are both integrally formed with a rubber layer.

[0032] The counterweight 10 increases the weight of the plug block 5, and under the action of the return spring 8, makes the plug block 5 fit more tightly with the mounting part 4, thus improving the sealing effect of preventing backflow. The rubber layer on the outer wall of the plug block 5 and the inner wall of the mounting part 4 can enhance the sealing when they are in contact. At the same time, the wear resistance of the rubber can reduce the frictional wear between the components, extend the service life of the plug block 5 and the mounting part 4, and ensure that the device can perform its anti-backflow function stably for a long time.

[0033] See Figure 2 The vertical section of the connecting rod 6 is set as an isosceles triangle, and the two connecting rods 6 are arranged in a cross shape.

[0034] The vertical section of the connecting rod 6 is an isosceles triangle and is arranged in a cross shape. This structure can enhance its own structural strength and is not easily deformed under the impact of water flow and the action of the return spring 8. At the same time, the cross-shaped layout can make the block block 5 more evenly stressed, ensuring that the block block 5 remains stable during movement and avoiding displacement due to uneven stress. This ensures the sealing effect of the block block 5 and the mounting part 4 and maintains the reliability of the device's anti-backflow function.

[0035] See Figure 1 The bottom of the pumping pipe 1 is connected to the dewatering well pipe 2. A submersible pump is installed at the connection between the pumping pipe 1 and the dewatering well pipe 2. The submersible pump is installed on the outer wall of the dewatering well pipe 2. Both the outer wall of the pumping pipe 1 and the outer wall of the dewatering well pipe 2 are fixedly installed with a ring 16. The top of the ring 16 is threaded with a hexagonal bolt.

[0036] The pumping pipe 1 and the dewatering well pipe 2 are connected by a ring 16 and hexagonal bolts, which facilitates easy installation and disassembly and makes it convenient for later maintenance or replacement of the submersible pump. The submersible pump is installed on the outer wall of the dewatering well pipe 2, which can more efficiently extract groundwater from the dewatering well pipe 2 and transport it to the pumping pipe 1. The combination of the ring 16 and the hexagonal bolts can enhance the stability of the connection between the pumping pipe 1 and the dewatering well pipe 2, reduce the impact of water flow impact and vibration generated by equipment operation on the connection, avoid loosening or leakage at the connection, and ensure the stable operation of the dewatering and backflow prevention functions.

[0037] See Figure 4 The exterior of the dewatering well pipe 2 is equipped with a filter cover, which is fitted with a stainless steel filter screen 13, a non-woven fabric filter layer 14, and a fine sand filter layer 15 from the outside to the inside.

[0038] The stainless steel filter screen 13, non-woven fabric filter layer 14, and fine sand filter layer 15 of the water filter cover form a multi-layer filtration system from the outside to the inside. This system can sequentially intercept large particles, fine sand, and tiny silt particles in the groundwater, reducing impurities entering the dewatering well pipe 2 and the pumping pipe 1. It also prevents components such as the submersible pump, block 5, and mounting parts 4 from being affected by blockage or wear, while ensuring smooth water flow, maintaining dewatering efficiency, and extending the overall service life of the device.

[0039] See Figure 4 A fixing ring 11 is fixedly installed on the top of the filter cover, and multiple fixing bolts 12 are threadedly connected to the outer circumference of the fixing ring 11.

[0040] The combination of the fixing ring 11 and multiple fixing bolts 12 can securely install the filter cover on the outside of the dewatering well pipe 2, preventing the filter cover from shifting or falling off during water flow impact or construction. At the same time, it facilitates the disassembly, cleaning or replacement of the stainless steel filter screen 13, non-woven filter layer 14 and fine sand filter layer 15 in the later stage, ensuring the filtration effect of the filter cover and the dewatering efficiency of the device.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A device for preventing backflow during dewatering in deep foundation pit construction, comprising a pumping pipe (1), characterized in that: An installation ring (3) is fixedly installed inside the water pipe (1). An installation component (4) is fixedly installed on the inner wall of the installation ring (3). A block (5) that is compatible with the installation component (4) abuts against the installation component (4). The installation component (4) is a ring-shaped disc structure. The whole is a bowl-shaped ring that fits the block (5). A through hole is provided in the center for water to flow through. The inner side has an inclined concave surface that is compatible with the outer inclined surface of the block (5). The installation component (4) abuts against the conical outer wall of the block (5) to achieve a matching fit in shape and ensure smooth flow of water up and down. Two connecting rods (6) are fixedly installed on the top of the block (5). A guide telescopic rod (7) and a return spring (8) are fixedly installed between the installation ring (3) and the connecting rods (6). The return spring (8) is sleeved on the outside of the guide telescopic rod (7).

2. The deep foundation pit construction dewatering and backflow prevention device as described in claim 1, characterized in that: A protective sleeve (9) is installed between the mounting ring (3) and the connecting rod (6), and the protective sleeve (9) is fitted over the outside of the guide telescopic rod (7) and the return spring (8).

3. The deep foundation pit construction dewatering and backflow prevention device as described in claim 2, characterized in that: The outer wall of the protective sleeve (9) is corrugated, and the material of the protective sleeve (9) is rubber.

4. The deep foundation pit construction dewatering and backflow prevention device as described in claim 3, characterized in that: A circular counterweight (10) is installed on the block (5), and the outer wall of the block (5) and the inner wall of the mounting component (4) are both integrally formed with a rubber layer.

5. A deep foundation pit construction dewatering and backflow prevention device as described in claim 4, characterized in that: The vertical section of the connecting rod (6) is set as an isosceles triangle, and the two connecting rods (6) are arranged in a cross shape.

6. The deep foundation pit construction dewatering and backflow prevention device as described in claim 5, characterized in that: The bottom of the pumping pipe (1) is connected to a dewatering well pipe (2). A submersible pump is installed at the connection between the pumping pipe (1) and the dewatering well pipe (2). The submersible pump is installed on the outer wall of the dewatering well pipe (2). A ring (16) is fixedly installed on the outer wall of both the pumping pipe (1) and the outer wall of the dewatering well pipe (2). A hexagonal bolt is threaded onto the top of the ring (16).

7. A deep foundation pit construction dewatering and backflow prevention device as described in claim 6, characterized in that: The outside of the rainwater well pipe (2) is equipped with a filter cover, and the filter cover is equipped with a stainless steel filter screen (13), a non-woven fabric filter layer (14), and a fine sand filter layer (15) from the outside to the inside.

8. The deep foundation pit construction dewatering and backflow prevention device as described in claim 7, characterized in that: A fixing ring (11) is fixedly installed on the top of the filter cover, and multiple fixing bolts (12) are threadedly connected to the outer circumference of the fixing ring (11).

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