A thick bottom plate dewatering well well packoff
Patent Information
- Application Number
- CN202521869189.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-01
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-01
AI Technical Summary
[0004]本实用新型的目的是为了解决现有技术中存在的灌入的混凝土无养护时间也缺乏有效保护措施，导致混凝土受地下水上涌及泵管拔出后留下的间隙的影响越发明显，更易导致混凝土不密实且强度不足的问题，而提出的一种厚底板降水井封井装置
1、本实用新型中，通过浇筑第一遍微膨胀防水混凝土时用抽水泵控制地下水水位，确保第一层混凝土密实，第一层混凝土凝固后与预埋钢套管形成整体，保障第二遍混凝土的密实，规避了传统工艺中混凝土无养护时间也无防护措施的弊端，减少了地下水对混凝土的冲洗及稀释，保障封板下混凝土的密实度、强度，相较于回填式封井工艺，也延长了工艺间歇，有利于观察施工质量情况，保障后续施工质量。
Smart Images
Figure CN224741610U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dewatering well sealing construction technology, and in particular to a thick-bottom plate dewatering well sealing device. Background Technology
[0002] Backfilling well sealing relies on pumps to control the groundwater level while coarse sand and gravel are filled into the bottom to slow the upwelling of groundwater. Concrete (or dry-mixed cement and gravel) is then poured in to further prevent upwelling, ensuring proper welding of the upper sealing plate. This method relies on multiple sealing plates to prevent leakage, prioritizing the welding quality of the upper sealing plates while neglecting the final quality of the concrete beneath. During construction, factors such as the upwelling speed of groundwater, worker operating space, coordination, and gaps left after pump pipe removal often result in insufficient thickness and poor compaction of the poured concrete.
[0003] In the construction of dewatering well sealing, especially when the design requires a deep concrete pouring depth, the groundwater pressure is also high. Due to the limitations of the past backfilling sealing process, the poured concrete has no curing time and lacks effective protection measures. As a result, the concrete is more significantly affected by the upwelling of groundwater and the gaps left after the pump pipe is pulled out. This makes it more likely that the concrete will not be dense and has insufficient strength. The weak area formed under the sealing slab has a more prominent impact on the sealing effect. For example, in the construction of dewatering well sealing in the basement floor slab, the thicker the floor slab, the more likely the local strength of the floor slab will be reduced when backfilling is used. Utility Model Content
[0004] The purpose of this invention is to solve the problem in the existing technology that the poured concrete has no curing time and lacks effective protection measures, which makes the concrete more susceptible to the effects of groundwater upwelling and the gaps left after the pump pipe is pulled out, making it more likely to cause the concrete to be loose and lack strength. Therefore, a sealing device for a thick-bottomed dewatering well is proposed.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sealing device for a thick-bottomed dewatering well, comprising a circular steel sealing plate, a steel pipe fixedly connected to the bottom surface of the circular steel sealing plate, a flexible pad fixedly connected to the edge of the bottom surface of the circular steel sealing plate, a straight threaded steel bar fixedly connected to the bottom surface of the circular steel sealing plate, the straight threaded steel bar being disposed on the outside of the steel pipe, a steel baffle fixedly connected to the top surface of the circular steel sealing plate, a steel plate movably connected to the inner wall of the steel baffle, a soft rubber pad fixedly connected to the bottom surface of the steel plate, an elastic steel sheet fixedly connected between one side of the steel plate and the inner wall of the steel baffle, a bolt with a hole at the tail end penetrating the top surface of the steel plate, and a steel wire rope connected to the bottom end of the bolt with a hole at the tail end.
[0006] Preferably, the bottom surface of the circular steel sealing plate is provided with a movable hole, and the top of the steel wire rope passes through the movable hole and is connected to the bottom end of the bolt with a hole at the tail.
[0007] Preferably, the outer wall of the tail end of the bolt with a hole is provided with a connecting hole, and a wire rope lock is fixedly connected to the upper outer wall of the wire rope. One end of the wire rope passes through the connecting hole and is fixedly connected to the wire rope lock.
[0008] Preferably, the wire rope is fitted with a tapered baffle.
[0009] Preferably, the conical baffle is positioned below the steel pipe, and the top of the wire rope is positioned inside the steel pipe.
[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, the groundwater level is controlled by a water pump when pouring the first layer of micro-expansion waterproof concrete to ensure the compactness of the first layer of concrete. After the first layer of concrete solidifies, it forms an integral whole with the pre-embedded steel sleeve, ensuring the compactness of the second layer of concrete. This avoids the drawbacks of traditional processes where concrete has no curing time or protective measures, reduces the flushing and dilution of concrete by groundwater, and ensures the compactness and strength of the concrete under the sealing plate. Compared with the backfilling well sealing process, it also extends the process interval, which is conducive to observing the construction quality and ensuring the quality of subsequent construction.
[0011] 2. In this utility model, a temporary bottom seal is formed by the front sealing device to ensure that the concrete can be poured to the bottom of the pre-embedded steel sleeve, avoiding the problem of insufficient concrete thickness in the traditional backfilling method; in conjunction with the conical baffle, the amount of concrete entering the steel pipe is reduced, and the design grade of micro-expansion waterproof concrete is used for secondary pouring to achieve the first curing and solidification, and the second waterless vibration, allowing the concrete to have sufficient time to harden, solving the problem of insufficient strength caused by non-dense concrete and lack of curing in the traditional process, and improving the density and strength compliance rate of the concrete under the sealing plate. Attached Figure Description
[0012] Figure 1 This utility model provides a three-dimensional structural schematic diagram of a sealing device for a thick-bottomed dewatering well; Figure 2 This utility model provides a cross-sectional view of the internal structure of a sealing device for a thick-bottomed dewatering well.
[0013] Legend: 1. Circular steel sealing plate; 2. Steel pipe; 3. Straight threaded steel bar; 4. Steel baffle; 5. Elastic steel sheet; 6. Steel plate; 7. Soft rubber pad; 8. Bolt with hole at the end; 9. Steel wire rope lock; 10. Steel wire rope; 11. Conical baffle; 12. Flexible pad. Detailed Implementation
[0014] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0015] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.
[0016] like Figure 1 and Figure 2 As shown, this utility model provides a sealing device for a thick-bottomed dewatering well, including a circular steel sealing plate 1. A steel pipe 2 is fixedly connected to the bottom surface of the circular steel sealing plate 1. A flexible pad 12 is fixedly connected to the bottom edge of the circular steel sealing plate 1. A straight threaded steel bar 3 is fixedly connected to the bottom surface of the circular steel sealing plate 1 and is located on the outside of the steel pipe 2. A steel baffle 4 is fixedly connected to the top surface of the circular steel sealing plate 1. A steel plate 6 is movably connected to the inner wall of the steel baffle 4. A soft rubber pad 7 is fixedly connected to the bottom surface of the steel plate 6. An elastic steel sheet 5 is fixedly connected between one side of the steel plate 6 and the inner wall of the steel baffle 4. The top surface of the steel plate 6 penetrates through... A bolt 8 with a hole at the tail is connected, and a steel wire rope 10 is connected to the bottom end of the bolt 8 with a hole at the tail. A movable hole is opened through the bottom surface of the circular steel sealing plate 1. The top of the steel wire rope 10 passes through the movable hole and is connected to the bottom end of the bolt 8 with a hole at the tail. A connecting hole is opened through the outer wall of the tail end of the bolt 8 with a hole at the tail. A steel wire rope lock 9 is fixedly connected to the upper outer wall of the steel wire rope 10. One end of the steel wire rope 10 passes through the inside of the connecting hole and is fixedly connected to the steel wire rope lock 9. A conical baffle 11 is fitted on the outside of the steel wire rope 10. The conical baffle 11 is located below the steel pipe 2, and the top of the steel wire rope 10 is located inside the steel pipe 2.
[0017] The specific setup and function of this embodiment are described in detail below. The front sealing device is composed of a circular steel sealing plate 1, a steel pipe 2, a straight threaded steel bar 3, and a flexible pad 12. This device separates the inner and outer spaces of the pre-embedded steel sleeve, provides bottom support for concrete pouring, and prevents groundwater from directly impacting the concrete to be poured. The steel pipe 2 is a seamless steel pipe, vertically welded to the bottom surface of the circular steel sealing plate 1. It is hollow inside, allowing the pump pipe to pass through and the steel wire rope 10 to pass through. The pipe diameter matches the outer diameter of the pump pipe, serving as a channel for the pump pipe to be inserted into the dewatering well to control the groundwater level. At the same time, it provides guidance for the steel wire rope 10, ensuring that it can accurately act on the steel plate 6 when tightened. The straight threaded steel bar 3 fixes the entire front sealing device. The welding force and the concrete bond force resist the pressure of the groundwater below, preventing the displacement of the front sealing device and the poured concrete, and preventing the expansion of the seepage path. The flexible pad 12 is set to fit tightly against the inner wall of the pre-embedded steel sleeve and the circular steel sealing plate 1, sealing the gap between the two and preventing grout leakage during the first concrete pour, thus ensuring the amount of concrete poured. A water-blocking device is composed of a steel baffle 4, an elastic steel sheet 5, a steel plate 6, a soft rubber pad 7, a bolt with a hole at the end 8, a wire rope lock 9, and a wire rope 10. The steel baffle 4 provides a sliding guide for the steel plate 6, ensuring that the steel plate 6 smoothly returns to its original position along the groove after the pump pipe is pulled out. At the same time, it limits the displacement range of the steel plate 6, ensuring the integrity of the water-blocking structure. When the pump pipe is inserted, it pushes open the steel plate 6, causing the elastic steel sheet 5 to compress and store energy. After the pump pipe is pulled out, it releases the elastic potential energy, causing the steel plate 6 and the soft rubber pad 7 to automatically return to their original positions, providing power for sealing the two holes of the steel pipe. The steel plate 6 is connected to the soft rubber pad 7, transmitting the restoring force of the elastic steel sheet 5 and the tightening force of the wire rope 10, ensuring that the soft rubber pad 7 is accurately aligned with the two holes of the steel pipe. To prevent the soft rubber pad 7 from failing due to excessive deformation under water pressure, the soft rubber pad 7 allows the steel plate 6 to undergo elastic deformation under the combined pressure of the steel wire rope 10 and the groundwater pressure after it is reset, completely blocking the lower end of the steel pipe 2 and forming a seal to prevent groundwater from surging up along the steel pipe 2. The steel wire rope 10 is locked after manual tightening, further compacting the fit between the soft rubber pad 7 and the steel pipe 2 and enhancing the sealing effect. Before the concrete sets, the tension is maintained to prevent the soft rubber pad 7 from rebounding. The conical baffle 11 is installed to block the lower end of the steel pipe 2 during the first pour of concrete, reducing the amount of concrete entering the interior of the steel pipe 2 and preventing the steel pipe 2 from becoming blocked, thus affecting the pump pipe extraction and the movement of the steel wire rope 10.
[0018] How to use and how to work this device: 1. Preliminary preparations and equipment pre-installation: Clean the impurities on the inner wall of the pre-embedded steel sleeve and check the water-blocking device: ensure that the elastic steel sheet 5 has normal elasticity and can drive the steel plate 6 to return smoothly, that the soft rubber pad 7 is undamaged, and that the steel wire rope 10 is firmly connected to the steel wire rope lock 9; fix the flexible pad 12 to the bottom edge of the circular steel sealing plate 1 to complete the assembly of the front sealing device. Insert the conical baffle 11 into the wire rope 10, then pass the wire rope 10 through the steel pipe 2 and the movable hole of the circular steel sealing plate 1 in sequence, connect it to the bolt with hole at the tail end, and fix it in the preliminary way through the wire rope lock 9, thus completing the integration of the water blocking device and the front sealing device.
[0019] 2. Equipment installation and water level control: Use the pump pipe to pry open the steel plate 6 and the soft rubber pad 7. Apply a thin layer of lubricating oil to the surface of the steel plate 6 to reduce drag. Insert the pump pipe into the dewatering well until it is close to the bottom. Start the water pump, remove the original submersible pump of the dewatering well, and control the water level to be no less than half a meter below the pre-embedded steel casing. Fill the lower part of the casing with sand and gravel up to the bottom of the casing. During this process, gradually raise the pump pipe to 1m below the bottom of the casing. The bottom half meter of sand and gravel can be mixed with cement and yellow sand to reduce seepage. Adjust the front sealing device to the specified elevation, and weld the top of the straight threaded steel bar 3 to the bottom of the sleeve; use a long wooden stick to adjust the flexible pad 12 so that it fits tightly against the inner wall of the sleeve and the circular steel sealing plate 1 to seal the gap.
[0020] 3. First concrete pouring and setting: Lower the conical baffle 11 to the lower end of the steel pipe 2 to cover the steel pipe 2; pour the designed grade of micro-expansion waterproof concrete between the sleeve and the front sealing device, up to 5-10cm below the upper end of the steel pipe 2, and vibrate to compact it; let it stand for curing until the concrete is completely solidified. At this time, the concrete, the sleeve, the circular steel sealing plate 1, and the straight threaded steel bar 3 form an integral whole, initially resisting water pressure.
[0021] 4. Pump pipe removal and water-blocking seal: Quickly pull out the pump pipe, which pulls out the conical baffle 11 along with it; the elastic steel sheet 5 releases potential energy, causing the steel plate 6 and soft rubber pad 7 to reset along the steel baffle 4, and the soft rubber pad 7 is initially aligned with the two holes of the steel pipe; manually tighten the steel wire rope 10, press down the steel plate 6 through the bolt with holes at the end 8, and squeeze the soft rubber pad 7 with the groundwater pressure to completely block the two holes of the steel pipe; observe for 10-15 minutes, and lock the steel wire rope lock 9 after confirming that there is no leakage.
[0022] 5. Second concrete pouring and sealing plate welding: Pour the second layer of micro-expansion concrete of the design grade to 6cm below the bottom slab elevation, filling the steel pipe 2 completely and compacting it. After the concrete has set, cut the steel wire rope 10. Weld the first sealing plate to the top of the casing, and weld the second sealing plate as needed. Pour concrete between the two sealing plates to complete the well sealing.
[0023] 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 other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.
Claims
1. A thick slab dewatering well well packoff device, characterized by: The device includes a circular steel sealing plate (1), a steel pipe (2) fixedly connected to the bottom surface of the circular steel sealing plate (1), a flexible pad (12) fixedly connected to the bottom edge of the circular steel sealing plate (1), a straight threaded steel bar (3) fixedly connected to the bottom surface of the circular steel sealing plate (1), the straight threaded steel bar (3) being arranged on the outside of the steel pipe (2), a steel baffle (4) fixedly connected to the top surface of the circular steel sealing plate (1), a steel plate (6) movably connected to the inner wall of the steel baffle (4), a soft rubber pad (7) fixedly connected to the bottom surface of the steel plate (6), an elastic steel sheet (5) fixedly connected between one side of the steel plate (6) and the inner wall of the steel baffle (4), a bolt with a hole at the tail end (8) penetratingly connected to the top surface of the steel plate (6), and a steel wire rope (10) connected to the bottom end of the bolt with a hole at the tail end (8).
2. A thick slab dewatering well well packoff device according to claim 1, wherein: The bottom surface of the circular steel sealing plate (1) is provided with a movable hole, and the top of the steel wire rope (10) passes through the movable hole and is connected to the bottom end of the bolt with a hole at the tail.
3. A thick slab dewatering well packoff as defined in claim 2 wherein: The tail end of the bolt with a hole (8) has a connecting hole through the outer wall of the tail end. The upper outer wall of the wire rope (10) is fixedly connected to a wire rope buckle (9). One end of the wire rope (10) passes through the connecting hole and is fixedly connected to the wire rope buckle (9).
4. A thick slab dewatering well packoff as defined in claim 1 wherein: The wire rope (10) is fitted with a conical baffle (11).
5. A thick slab dewatering well packoff as defined in claim 4 wherein: The conical baffle (11) is located below the steel pipe (2), and the top of the wire rope (10) is located inside the steel pipe (2).