Plugging structure of dewatering well

Abstract

The utility model discloses a dewatering well plugging structure which is arranged at an upper port of a water well steel pipe and comprises a first galvanized steel pipe, micro-expansion concrete, an internal thread ball valve, a hemispherical steel plate and a second galvanized steel pipe. The hemispherical steel plate is welded to the upper end of the inner wall of the water well steel pipe, the second galvanized steel pipe penetrates through the hemispherical steel plate, the lower end of the second galvanized steel pipe extends to the bottom of the water well steel pipe, and the upper end of the second galvanized steel pipe is connected with the first galvanized steel pipe through the internal thread ball valve. The micro-expansive concrete is poured between the upper end face of the hemispherical steel plate and the inner wall of the water well steel pipe. The dewatering well plugging structure aims to overcome the defects in the prior art, so that the investment of materials is reduced, and the construction quality and the construction efficiency are improved.

Description

Technical Field

[0001] This utility model relates to a sealing structure for dewatering wells. Background Technology

[0002] Traditional well sealing involves filling the well casing with crushed rock, then grouting, and finally pouring concrete. The basic operational sequence and related technical requirements are as follows:

[0003] After the foundation pit is excavated to the design elevation, a waterstop plate with an outer diameter of φ600mm is welded to the outside of the well pipe, 50cm above the excavation surface at the bottom of the pit. Before sealing the well after the dewatering operation is completed, pre-mix approximately 1.00m³ of cement slurry with a water-cement ratio of 0.4-0.5. Fill the well pipe with crushed stone chips, with the backfill height of the chips approximately 4.00m-5.00m below the bottom slab of the foundation pit. Lower the grouting pipe into the well pipe, with the bottom end of the grouting pipe about 1.00m above the backfill height of the crushed stone chips. Install a pressure plate inside the well pipe, connected to the grouting pipe and inserted into the well by the grouting pipe. The placement depth of the pressure plate should be the same as the top of the crushed stone backfill. Before formal grouting, the wellhead is supported with steel bars to fix the grouting pipe. Grouting then begins. During grouting, the cement slurry is required to seep through the gaps in the filter pipe at the bottom, sealing the gaps. Generally, all the pre-mixed cement slurry should be injected. After grouting is complete and the cement slurry has reached its initial setting time, residual water above the pressure plate in the wellhead is pumped out, and the water level or elevation changes in the wellhead are monitored. Generally, if the water level in the wellhead does not rise significantly after 2-4 hours of observation, the grouting effect is good. Once the grouting effect is determined, concrete is poured into the wellhead, with the concrete pouring height slightly lower than the concrete surface of the foundation pit bottom slab by about 10cm. After concrete pouring is completed, the water level changes in the wellhead are monitored. Once the initial setting of the concrete in the wellhead meets the requirements and the actual sealing effect is confirmed, all exposed wellhead sections can be cut off. After the wellhead is cut off, the pipe opening is sealed with an iron plate, with the pipe opening approximately 10cm below the concrete surface of the base. After the pipe opening is welded and sealed, the hole is filled with cement mortar and smoothed out, and the well sealing work is completed.

[0004] The traditional well-sealing structure described above requires filling with mineral deposits and grouting, making the operation complex. If the water level rises rapidly, 3 to 5 wells need to be left in place for continued operation, increasing dewatering costs. Therefore, a dewatering well sealing structure is proposed to address these issues. Utility Model Content

[0005] The purpose of this utility model is to overcome the existing defects and provide a dewatering well sealing structure that reduces material input and improves construction quality and efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dewatering well sealing structure, installed at the upper end of a water well steel pipe, comprising a first galvanized steel pipe, micro-expansion concrete, an internally threaded ball valve, a hemispherical steel plate, and a second galvanized steel pipe;

[0007] The hemispherical steel plate is welded to the upper end of the inner wall of the water well steel pipe. The second galvanized steel pipe passes through the hemispherical steel plate, with its lower end extending to the bottom of the water well steel pipe and its upper end connected to the first galvanized steel pipe through the internal thread ball valve. The micro-expansion concrete is poured between the upper surface of the hemispherical steel plate and the inner wall of the water well steel pipe.

[0008] Preferably, the outer wall of the water well steel pipe is poured with reinforced concrete for the raft slab up to the finished surface of the raft slab; a cushion concrete layer is provided between the reinforced concrete for the raft slab and the excavation bottom surface.

[0009] Preferably, a steel plate water-stop ring is connected to the outer wall of the water well steel pipe, and the steel plate water-stop ring is located inside the reinforced concrete of the raft slab.

[0010] Preferably, the lower end of the second galvanized steel pipe is wrapped with a filter screen.

[0011] Preferably, the upper end of the first galvanized steel pipe is flush with the finished surface of the raft slab.

[0012] Preferably, the outer wall of the second galvanized steel pipe is welded to the hemispherical steel plate.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This dewatering well sealing structure involves welding a second galvanized steel pipe to a hemispherical steel plate, then connecting the first and second galvanized steel pipes with an internally threaded ball valve, and finally welding the above device to the dewatering well for sealing. This achieves self-drainage of the water pressure inside the dewatering well. When sealing is required, simply closing the internally threaded ball valve is sufficient. Compared with traditional well sealing methods, this invention reduces the need for materials such as cement and sand / gravel mixtures during implementation, improving construction quality and efficiency. The dewatering well sealing procedure is simpler and easier to operate. Compared with traditional well sealing methods, it saves materials and costs. The hemispherical steel plate experiences more uniform stress, reducing stress at the connection with the well pipe. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the dewatering well sealing structure of this utility model;

[0016] Figure 2This is a detailed drawing of the well sealing structure of this utility model;

[0017] Figure 3 This is a detailed diagram of the connection of the hemispherical steel plate of this utility model.

[0018] In the diagram: 1. Subbase concrete; 2. Raft foundation reinforced concrete; 3. Steel plate waterstop ring; 4. First galvanized steel pipe; 5. Micro-expansion concrete; 6. Internally threaded ball valve; 7. Hemispherical steel plate; 8. Second galvanized steel pipe; 9. Filter screen; 10. Well steel pipe. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-3 The dewatering well sealing structure, located at the upper end of the well steel pipe 10, includes a first galvanized steel pipe 4, micro-expansion concrete 5, an internally threaded ball valve 6, a hemispherical steel plate 7, and a second galvanized steel pipe 8. The hemispherical steel plate 7 is welded to the upper end of the inner wall of the well steel pipe 10, and the second galvanized steel pipe 8 penetrates the hemispherical steel plate 7, with its outer wall welded to the hemispherical steel plate 7. The lower end extends to the bottom of the well steel pipe 10, and the upper end is connected to the first galvanized steel pipe 4 via the internally threaded ball valve 6. The upper end of the first galvanized steel pipe 4 is flush with the finished surface of the raft slab. Micro-expansion concrete 5 is poured between the upper surface of the hemispherical steel plate 7 and the inner wall of the well steel pipe 10.

[0021] Specifically, the outer wall of the water well steel pipe 10 is poured with raft slab reinforced concrete 2 to the finished surface of the raft slab; a cushion concrete layer 1 is set between the raft slab reinforced concrete 2 and the excavation bottom surface. A steel plate waterstop ring 3 is connected to the outer wall of the water well steel pipe 10, and the steel plate waterstop ring 3 is located inside the raft slab reinforced concrete 2.

[0022] Specifically, the lower end of the second galvanized steel pipe 8 is wrapped with a filter screen 9.

[0023] Specifically, during construction, the following materials are prepared: a 2500mm long DN25 second galvanized steel pipe 8, a 200mm long DN25 first galvanized steel pipe 4; a 6mm thick hemispherical steel plate 7 with a radius of 250mm; and a DN25 internally threaded ball valve 6. The 2500mm long DN25 second galvanized steel pipe 8 is welded to the hemispherical steel plate 7, with full welding on both the top and bottom sides. A 100-mesh filter screen 9 is wrapped around the bottom 30cm of the second galvanized steel pipe 8. The water level is lowered to the lowest point, and the pump is quickly pumped in. Rust removal and cleaning of the well pipe from 40cm to 25cm below the raft surface is completed. The hemispherical steel plate 7 is fully welded to the well steel pipe 10. The 2500mm long DN25 second galvanized steel pipe 8 is connected to the 200mm long DN25 first galvanized steel pipe 4 using the internally threaded ball valve 6. Close the internal threaded ball valve 6, cut off the protruding part of the galvanized steel pipe, and pour micro-expansion concrete 5, which is one grade higher than the raft foundation concrete, up to the finished surface of the raft foundation. At this point, the dewatering well is sealed.

[0024] After the well is sealed, the ball valve can be opened to automatically drain water through the internal vacuum pressure. This allows the well point dewatering to be stopped in advance. Once the basement raft slab is poured, the water can be drained to the collection well by connecting a hose, thus removing the dewatering water in advance and saving dewatering costs.

[0025] Before sealing the well, close the internal threaded ball valve 6. Before pouring concrete, the dewatering well can be continuously observed for 3 to 5 days. If deformation or leakage is found in the hemispherical steel plate 7, it can be repaired in time, and the repair cost will be greatly reduced. After the repair, continue to observe for a period of time. If no deformation or leakage is found, it indicates that the well is well sealed and micro-expansion concrete can be poured directly to seal it.

[0026] This dewatering well sealing structure involves welding a second galvanized steel pipe 8 to a hemispherical steel plate 7, then connecting the first galvanized steel pipe 4 to the second galvanized steel pipe 8 using an internally threaded ball valve 6. The entire assembly is then welded to the dewatering well for sealing, allowing for self-discharge of water pressure within the well. Sealing is achieved simply by closing the internally threaded ball valve. Compared to traditional well sealing methods, this invention reduces the need for materials such as cement and aggregate mixtures, improving construction quality and efficiency. The dewatering well sealing procedure is simpler and easier to operate. It also saves on materials and costs compared to traditional methods. Furthermore, the hemispherical steel plate distributes stress more evenly, reducing stress at the connection point with the well pipe.

[0027] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A precipitation well plugging structure provided at an upper port of a water well steel pipe (10), characterized by, It comprises a first galvanized steel pipe (4), micro-expansion concrete (5), an internally threaded ball valve (6), a semispherical steel plate (7) and a second galvanized steel pipe (8). The semispherical steel plate (7) is welded on the inner wall of the upper end of the water well steel pipe (10), the second galvanized steel pipe (8) penetrates the semispherical steel plate (7) and extends to the bottom of the water well steel pipe (10) at the lower end and is connected to the first galvanized steel pipe (4) through the internally threaded ball valve (6) at the upper end; the micro-expansion concrete (5) is poured between the upper end surface of the semispherical steel plate (7) and the inner wall of the water well steel pipe (10).

2. The precipitation well plugging structure according to claim 1, characterized in that, The outer wall of the water well steel pipe (10) is poured with raft reinforced concrete (2) to the raft completion surface; a cushion concrete (1) is arranged between the raft reinforced concrete (2) and the excavation bottom surface.

3. The precipitation well plugging structure according to claim 2, characterized in that, The outer wall of the water well steel pipe (10) is connected with a steel plate water stop ring (3) which is located in the raft reinforced concrete (2).

4. The precipitation well plugging structure according to claim 1, characterized in that, The lower end of the second galvanized steel pipe (8) is wrapped with a filter screen (9).

5. The precipitation well plugging structure according to claim 1, characterized in that, The upper end of the first galvanized steel pipe (4) is flush with the raft completion surface.

6. The precipitation well plugging structure of claim 1, wherein, The outer wall of the second galvanized steel pipe (8) is welded with the semispherical steel plate (7).

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