A well sealing device for a pre-bored steel casing dewatering well
By combining pre-embedded steel casings and automatic water-blocking devices, concrete is poured in stages, solving the problem of insufficient concrete compaction in traditional backfilling methods, improving the quality and strength of well sealing, and adapting to the sealing needs of different depths.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 吴德生
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-21
AI Technical Summary
In traditional backfilling methods for sealing dewatering wells, the concrete thickness is insufficient and not dense enough, especially at deeper depths where the bottom of the sealing plate is weak, affecting the quality of the sealing.
The concrete is poured in stages using pre-embedded steel sleeves, conical cover plates, and automatic water-blocking devices. The conical cover plates prevent groundwater from surging up, and the automatic water-blocking devices reset and seal the lower end of the steel pipe to prevent the formation of pores and ensure the concrete is dense.
It improves the density and overall strength of concrete, eliminates the weak area at the bottom of the sealing plate, ensures stable well sealing quality, and adapts to the well sealing requirements of different depths.
Smart Images
Figure CN224531746U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of dewatering well sealing devices, specifically a dewatering well sealing device with a pre-embedded steel casing. Background Technology
[0002] Backfilling well sealing relies on pouring concrete (or dry-mixed cement and gravel) over coarse sand and gravel at the bottom, combined with pumping to prevent groundwater from rising and ensure proper welding of the upper sealing plate. The construction process is affected by the rate of groundwater rise, the available space for workers, the level of coordination, and the pump pipe that cannot be removed before the sealing plate is welded. This often results in insufficient thickness and loose compaction of the poured concrete. Furthermore, due to pipe diameter limitations, workers cannot enter deeper to seal the plate, inevitably leading to a weak bottom for the sealing plate.
[0003] In the construction of dewatering well sealing, when the design requires a deep concrete pouring depth, the traditional backfilling sealing process, which involves backfilling the bottom with coarse sand followed by direct pouring of concrete or dry-mixed cement and aggregate, and finally installing a multi-layered welded sealing plate on top, often only allows workers to reinforce the shallow sealing plate. Furthermore, the poured concrete lacks curing time and effective protection measures, making it susceptible to damage from groundwater runoff and gaps left after pump pipe removal. This results in loose concrete with insufficient strength, creating a weak zone below the sealing plate. In the construction of dewatering well sealing in basement slabs, the thicker the slab, the worse the effect of backfilling. Utility Model Content
[0004] To address the aforementioned technical problems, this utility model provides a sealing device for dewatering wells with pre-embedded steel casings. It can form a temporary bottom seal at a preset position of the dewatering well according to actual needs. Through the cooperation of steel pipes, conical cover plates, and automatically resetting water-blocking components, the pump pipe and concrete are separated, avoiding the gaps caused by removing the pump pipe. At the same time, it enables phased concrete pouring, ensuring the curing period and compaction of the concrete.
[0005] To achieve its technical objectives, this utility model adopts the following technical solution.
[0006] A sealing device for a dewatering well with a pre-embedded steel casing includes a steel casing, a conical cover plate, a front sealing device, and an automatic water-blocking device, wherein the steel casing is pre-embedded in the dewatering well.
[0007] The front sealing device includes a conical steel sealing plate and a steel pipe. The opening of the conical steel sealing plate faces downward and the steel pipe is connected to the center of the upper part of the conical steel sealing plate. The conical steel sealing plate is fixed to a preset position inside the steel sleeve by reinforcing bars.
[0008] The automatic water-blocking device includes a water-blocking component and an elastic steel sheet. The water-blocking component is located in the center of the conical steel sealing plate and is used to block the lower end of the steel pipe. One end of the water-blocking component and the elastic steel sheet are fixedly connected, and the other end of the elastic steel sheet is fixed to the lower wall of the conical steel sealing plate.
[0009] The conical cover plate opens downwards and movably covers the upper end of the steel pipe. A through hole adapted to the pump pipe is provided in the center of the conical cover plate. The inner diameter of the steel pipe is larger than the outer diameter of the pump pipe.
[0010] Preferably, the front sealing device further includes a flexible pad, which is adapted to the conical steel sealing plate and is attached to the upper wall of the conical steel sealing plate. The flexible pad has a through hole in the center for the steel pipe to pass through, and the edge of the flexible pad abuts against the inner wall of the steel sleeve. The flexible pad is used to prevent grout leakage when filling concrete.
[0011] Preferably, the steel pipe and the tapered steel sealing plate are designed as an integrated unit.
[0012] Preferably, the upper wall of the conical steel sealing plate is vertically fixedly connected to the reinforcing bar near the edge, and the upper end of the reinforcing bar is fixedly connected to the inner wall of the steel sleeve.
[0013] Preferably, the water-blocking component includes a conical soft rubber pad, which is narrower at the top and wider at the bottom, and the inclined sidewall of the conical soft rubber pad is integrally formed with a groove, and the conical soft rubber pad is adapted to the middle part of the conical steel sealing plate.
[0014] More preferably, the water-blocking component further includes a central steel plate, the top surface of which is fixedly connected to the bottom surface of the conical soft rubber pad, and one end of which is fixedly connected to the elastic steel sheet. Under the elastic force of the elastic steel sheet, the central steel plate and the conical soft rubber pad can fit against the middle of the conical steel sealing plate and block the lower end of the steel pipe.
[0015] More preferably, the automatic water-blocking device further includes a connecting bolt, and the center of the central steel plate and the conical soft rubber pad are both provided with threaded holes communicating with the steel pipe. The connecting bolt passes through the threaded hole from bottom to top, and the upper end of the connecting bolt is located inside the steel pipe.
[0016] More preferably, the automatic water-blocking device further includes a steel wire rope, one end of which is fixedly connected to the upper end of the connecting bolt, and the other end of which passes through the steel pipe.
[0017] More preferably, the upper ends of the wire rope and the connecting bolt are fixedly connected by a wire rope lock.
[0018] The beneficial effects of this utility model are as follows:
[0019] This invention employs a layered and phased approach to concrete pouring within the dewatering well, effectively solving the problems of insufficient concrete thickness and poor compaction inherent in traditional backfilling methods. During the first pour, a conical cover plate prevents concrete from entering the steel pipe, ensuring continuous pumping operations. After the concrete solidifies, the pump pipe is removed, and the automatic water-blocking device automatically resets and seals the lower end of the steel pipe, preventing groundwater from flowing up through the pipe and reducing the impact of groundwater on concrete solidification, thus ensuring stable and reliable well sealing quality. The second pour involves pouring concrete into the steel pipe and the well itself. By this time, the first pour has formed a stable foundation, and the presence of the steel pipe prevents the formation of pores in the concrete after the pump pipe is removed, as is common in traditional pouring methods. This significantly improves the density and overall strength of the concrete, eliminating weak areas below the sealing plate.
[0020] This invention overcomes the drawbacks of traditional backfilling methods that are limited by pipe diameter and bottom plate thickness. It eliminates the need for workers to enter deep areas for operation and can adapt to well sealing requirements at different depths by pre-embedded steel casing and pre-set conical steel sealing plates. Attached Figure Description
[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;
[0022] Figure 2 yes Figure 1 Longitudinal cross-section;
[0023] Figure 3 yes Figure 1 Inverted image;
[0024] Figure 4 This is a schematic diagram of the state during the pouring of the first layer of concrete in an embodiment of this utility model;
[0025] Figure 5 This is a schematic diagram showing the state of the well after the final welding of the sealing plate and completion of the well sealing operation in this embodiment of the utility model.
[0026] Figure label:
[0027] 1. Conical steel sealing plate; 2. Steel pipe; 3. Reinforcing bar; 4. Central steel plate; 5. Elastic steel sheet; 6. Connecting bolt; 7. Steel wire rope; 8. Conical soft rubber pad; 9. Flexible pad; 10. Steel wire rope lock; 11. Conical cover plate; 12. Steel sleeve; 13. Pump pipe; 14. Sand and gravel; 15. First layer of concrete; 16. Second layer of concrete; 17. Dewatering well; 18. Groove. Detailed Implementation
[0028] In the description of this utility model, it should be noted that the terms "upper / lower", "front / rear", "inner / outer", "top / bottom", 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 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.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within the components of a compatible model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, unless otherwise specified, all components used in this application are commercially available components, and the connection between different components can be achieved through conventional technical means.
[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0031] A sealing device for dewatering wells with pre-embedded steel casing, such as Figures 1-5 As shown, it includes a steel casing 12, a conical cover plate 11, a front sealing device and an automatic water blocking device, wherein the steel casing 12 is pre-embedded in the dewatering well 17;
[0032] The front sealing device includes a conical steel sealing plate 1 and a steel pipe 2. Specifically, the conical steel sealing plate 1 has an overall opening facing downwards, and the steel pipe 2 is connected to the center of the upper part of the conical steel sealing plate 1. The steel pipe 2 and the conical steel sealing plate 1 are designed as an integrated unit. The conical steel sealing plate 1 is fixed to a preset position inside the steel sleeve 12 by a steel bar 3.
[0033] The automatic water-blocking device includes a water-blocking component and an elastic steel sheet 5. The water-blocking component is located in the center of the conical steel sealing plate 1 and is used to block the lower end of the steel pipe 2. One end of the water-blocking component and the elastic steel sheet 5 are fixedly connected, and the other end of the elastic steel sheet 5 is fixed to the lower wall of the conical steel sealing plate 1.
[0034] The conical cover plate 11 has an opening facing downwards and is movable to cover the upper end of the steel pipe 2. The conical cover plate 11 has a through hole in the center that is compatible with the pump pipe 13 of the water pump.
[0035] Preferably, the inner diameter of the steel pipe 2 is larger than the outer diameter of the pump pipe 13, and the outer diameter of the lower end of the conical cover plate 11 is larger than the outer diameter of the steel pipe 2. This design ensures that the pump pipe 13 is not affected by the wire rope 7 when it is inserted into the steel pipe 2.
[0036] It should be noted that when the water-blocking component and the lower wall of the conical steel sealing plate 1 are attached to and block the lower end of the steel pipe 2, the elastic steel sheet 5 is in a compressed state. At the same time, the pump pipe 13 of the water pump passes through the conical cover plate 11 and the steel pipe 2 in sequence, and overcomes the elastic force of the elastic steel sheet 5 to push open the water-blocking component at the lower end of the steel pipe 2, and finally comes into contact with the groundwater below the device to carry out water pumping. The conical cover plate 11 can move along the pump pipe 13 to the upper end of the steel pipe 2 to achieve movable closing.
[0037] Preferably, the front sealing device further includes a flexible pad 9, which is adapted to the conical steel sealing plate 1 and is attached to the upper wall of the conical steel sealing plate 1. At the same time, the flexible pad 9 has a through hole in the center for the steel pipe 2 to pass through, and the edge of the flexible pad 9 abuts against the inner wall of the steel sleeve 12. The flexible pad 9 is used to prevent grout leakage when the first layer of concrete 15 is poured above the conical steel sealing plate 1 and around the steel pipe 2.
[0038] Preferably, a reinforcing bar 3 is vertically fixedly connected to the upper wall of the conical steel sealing plate 1 near its edge, and the upper end of the reinforcing bar 3 is fixedly connected to the inner wall of the steel sleeve 12; specifically, such as Figure 4 and Figure 5 As shown, one end of the reinforcing bar 3 is welded to the upper wall of the tapered steel sealing plate 1 near the edge, and the other end is welded to the inner wall of the steel sleeve 12.
[0039] As a preferred option, such as Figure 2 As shown, the water-blocking component includes a conical soft rubber pad 8 and a central steel plate 4. The conical soft rubber pad 8 is narrower at the top and wider at the bottom, and the inclined sidewall of the conical soft rubber pad 8 is integrally formed with a groove 18. The function of the groove 18 is to reduce the influence of small particles on the sealing effect. The conical soft rubber pad 8 and the conical steel sealing plate 1 are fitted together in the middle. The top surface of the central steel plate 4 and the bottom surface of the conical soft rubber pad 8 are fixedly connected. The central steel plate 4 and one end of the elastic steel sheet 5 are fixedly connected. Under the elastic force of the elastic steel sheet 5, the central steel plate 4 and the conical soft rubber pad 8 can fit into the middle of the conical steel sealing plate 1 and block the lower end of the steel pipe 2.
[0040] It should be noted that the conical soft rubber pad 8 has a certain degree of elasticity and flexibility, which can fit tightly against the lower wall of the conical steel sealing plate 1. Under a certain external force, it can deform and completely seal the lower end of the steel pipe 2. On the other hand, it can provide a reset buffer and increase the service life of the components. The function of the elastic steel sheet 5 is to push the conical soft rubber pad 8 and the central steel plate 4 to reset when the pump pipe 13 is pulled out after the pumping work is completed, thus initially sealing the lower end of the steel pipe 2.
[0041] As a better option, such as Figure 2As shown, the automatic water-blocking device also includes a connecting bolt 6 and a steel wire rope 7. The center of the central steel plate 4 and the conical soft rubber pad 8 are both provided with threaded holes that communicate with the steel pipe 2. The connecting bolt 6 passes through the threaded hole from bottom to top and the upper end of the connecting bolt 6 is located inside the steel pipe 2. One end of the steel wire rope 7 is fixedly connected to the upper end of the connecting bolt 6, and the other end passes through the steel pipe 2.
[0042] As a better option, such as Figure 2 As shown, the upper ends of the wire rope 7 and the connecting bolt 6 are fixedly connected by the wire rope lock 10.
[0043] It should be noted that the lower end nut of the connecting bolt 6 is attached to the central steel plate 4, while the lower end of the wire rope 7 is fixedly connected to the connecting bolt 6; after the conical soft rubber pad 8 and the central steel plate 4 are reset, the wire rope 7 is pulled upward to deform the conical soft rubber pad 8, which, together with the water pressure, fully seals the lower end of the steel pipe 2.
[0044] The operation method of this utility model is as follows:
[0045] a. When the well sealing begins, relevant plans, equipment, personnel and materials must be prepared, the inner wall of the steel casing 12 inside the dewatering well 17 must be cleaned, and the performance parameters of the pump used should meet the site requirements.
[0046] b. Check if the water-blocking device is unobstructed (mainly check if the force of the elastic steel plate 5 of the water-blocking device affects the insertion and removal of the pump pipe 13 and whether the conical soft rubber pad 8 can be accurately reset after the pump pipe 13 is removed). Insert the steel pipe 2 and conical cover plate 11 of the device into the pump pipe 13 in advance, and use the pump pipe 13 to push open the conical soft rubber pad 8. Only insert the pump pipe 13 into the dewatering well, insert it to near the bottom, and start the pumping operation. At this time, the conical steel sealing plate 1 has not yet been installed inside the steel casing 12. When the pumping pump is officially working, remove the original submersible pump in the dewatering well (the submersible pump is mainly used to extract a large amount of water in the well. When the water level drops to the preset position, the pumping pump is used to replace it for pumping operation). Among them, the pump pipe 13 located near the bottom of the steel casing 12 should be made of rigid and smooth pipe. Control the distance between the final water level after extraction and the bottom of the steel casing 12 to be greater than half a meter.
[0047] c. For example Figure 4 As shown, fix the position of pump pipe 13 so that the entire pump pipe 13 is positioned inside the steel casing 12 near the central axis; fill the steel casing 12 with sand and gravel 14, and gradually raise the pump pipe 13 to a position 1m below the lower pipe opening of the steel casing 12. When backfilling the sand and gravel layer half a meter below the steel casing 12, cement and yellow sand can be mixed in to reduce the water seepage rate. Then install the entire well sealing device to the designated elevation (not lower than the bottom of the steel casing 12 and at least 3cm away from the sand and gravel layer 14 to prevent obstruction of the automatic water blocking device's reset action), and weld the top of the reinforcing bar 3 to the inner wall of the dewatering well steel casing 12.
[0048] d. Lower the conical cover plate 11 along the pump pipe 13 and cover the upper end of the steel pipe 2 to reduce the amount of concrete poured into the steel pipe 2 when the first layer of concrete 15 is poured; pour the designed grade of micro-expansion waterproof concrete to the top of the conical steel cover plate 1 and around the steel pipe 2, and the final height of the concrete and the vertical distance between the top of the steel pipe 2 and the upper end of the steel pipe 2 is 5-10cm.
[0049] e. After the concrete has solidified, quickly pull out the pump pipe 13 and pull out the pump pipe 13 together with the conical cover plate 11. The elastic steel plate 5 drives the central steel plate 4 and the conical soft rubber pad 8 to reset together, initially sealing the steel pipe 2. Then tighten the steel wire rope 7, and with the water pressure squeezing the central steel plate 4, deform the conical soft rubber pad 8 to completely seal the lower end of the steel pipe 2.
[0050] f. Tighten the steel wire rope 7. After observing that there is no obvious leakage at the bottom, continue pouring the second layer of concrete 16 into the steel casing 12 to the preset height. During this process, the steel pipe 2 is also filled. After the second layer of concrete 16 has fully set, cut the steel wire rope 7, and then weld the first sealing plate, fully welding it in place. If necessary, another sealing plate can be welded below the first sealing plate, and then concrete is poured in between. The final state of the dewatering well is as follows. Figure 5 As shown.
[0051] Although the embodiments of this utility model have been described in the specification, these embodiments are merely illustrative and should not limit the scope of protection of this utility model. Various omissions, substitutions, and modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.
Claims
1. A sealing device for a dewatering well with a pre-embedded steel casing, characterized in that, It includes a steel casing, a conical cover plate, a front sealing device, and an automatic water-blocking device, wherein the steel casing is pre-embedded in the dewatering well; The front sealing device includes a conical steel sealing plate and a steel pipe. The opening of the conical steel sealing plate faces downward and the steel pipe is connected to the center of the upper part of the conical steel sealing plate. The conical steel sealing plate is fixed to a preset position inside the steel sleeve by reinforcing bars. The automatic water-blocking device includes a water-blocking component and an elastic steel sheet. The water-blocking component is located in the center of the conical steel sealing plate and is used to block the lower end of the steel pipe. One end of the water-blocking component and the elastic steel sheet are fixedly connected, and the other end of the elastic steel sheet is fixed to the lower wall of the conical steel sealing plate. The conical cover plate opens downwards and movably covers the upper end of the steel pipe. A through hole adapted to the pump pipe is provided in the center of the conical cover plate. The inner diameter of the steel pipe is larger than the outer diameter of the pump pipe.
2. The well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 1, characterized in that, The front sealing device also includes a flexible pad, which is adapted to the conical steel sealing plate and is attached to the upper wall of the conical steel sealing plate. The flexible pad has a through hole in the center for the steel pipe to pass through, and the edge of the flexible pad abuts against the inner wall of the steel sleeve. The flexible pad is used to prevent grout leakage when filling concrete.
3. The well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 1, characterized in that, The steel pipe and the tapered steel sealing plate are designed as an integrated unit.
4. The well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 1, characterized in that, The upper wall of the conical steel sealing plate is vertically fixedly connected to the reinforcing bar near the edge, and the upper end of the reinforcing bar is fixedly connected to the inner wall of the steel sleeve.
5. A well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 1, characterized in that, The water-blocking component includes a conical soft rubber pad, which is narrower at the top and wider at the bottom, and the inclined sidewall of the conical soft rubber pad is integrally formed with a groove. The conical soft rubber pad and the conical steel sealing plate are adapted to each other in the middle.
6. The well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 5, characterized in that, The water-blocking component also includes a central steel plate, the top surface of which is fixedly connected to the bottom surface of the conical soft rubber pad, and one end of which is fixedly connected to the elastic steel sheet. Under the elastic force of the elastic steel sheet, the central steel plate and the conical soft rubber pad can fit into the middle of the conical steel sealing plate and block the lower end of the steel pipe.
7. A well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 6, characterized in that, The automatic water-blocking device also includes a connecting bolt. The center of the central steel plate and the conical soft rubber pad are both provided with threaded holes that communicate with the steel pipe. The connecting bolt passes through the threaded hole from bottom to top, and the upper end of the connecting bolt is located inside the steel pipe.
8. A well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 7, characterized in that, The automatic water-blocking device also includes a steel wire rope, one end of which is fixedly connected to the upper end of the connecting bolt, and the other end of which passes through the steel pipe.
9. A well sealing device for a dewatering well with a pre-embedded steel casing as described in claim 8, characterized in that, The upper ends of the wire rope and the connecting bolt are fixedly connected by a wire rope lock.