A structural floor lowering water well plugging device

Abstract

This utility model provides a sealing device for a dewatering well in a structural base plate, comprising a pre-embedded sleeve, a sealing plate, a first water-stop ring, and an operating rod. A pre-drilled hole is provided on the inner bottom plate of the pre-embedded sleeve. The sealing plate is fixed inside the pre-embedded sleeve by a limiting mechanism to seal the pre-drilled hole. The first water-stop ring is sandwiched between the inner bottom plate of the pre-embedded sleeve and the sealing plate around the pre-drilled hole. The operating rod is detachably mounted on the sealing plate to move the sealing plate to the limiting mechanism. Compared with existing technologies where welding quality is difficult to control, this utility model, through the synergistic effect of the above structures, can effectively seal the dewatering well, preventing seepage and leakage in the later stages of sealing, thus improving project quality. Furthermore, this sealing device has low environmental requirements and can be used even when the groundwater level is high or when there is confined water in the strata.

Description

Technical Field

[0001] This utility model relates to the field of dewatering well sealing construction technology, and in particular to a dewatering well sealing device for a structural base plate. Background Technology

[0002] During the construction of the main structure of a building (especially high-rise buildings), it is often necessary to dewater the groundwater. When the basement area is large and the water level is high, it is often necessary to install dewatering wells under the basement structure slab due to the need for dewatering and anti-buoyancy during the construction of the main structure. After the concrete of the structure slab is poured, these dewatering wells still need to be operated for a certain period of time before they can be sealed.

[0003] Traditional sealing methods involve raising the dewatering wells under the foundation slab using steel casings and embedding steel plates in the finished surface of the foundation slab. After dewatering stops, the sealing steel plates are welded to the embedded steel plates to achieve the sealing purpose. However, this construction method can only be carried out in a water-free state and is not suitable when the groundwater level is high or when there is pressurized water in the strata. Furthermore, due to the inability to guarantee the welding quality, water seepage often occurs at the dewatering wells later on. For buildings, this can range from affecting the aesthetic quality to, in severe cases, affecting the building's functionality and durability. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing device for a bottom slab drainage well, which solves the shortcomings in the above-mentioned background technology.

[0005] The technical solution of this utility model is: a sealing device for a bottom slab drainage well, comprising:

[0006] An embedded sleeve is provided, wherein a reserved hole is provided on the inner bottom plate of the embedded sleeve;

[0007] A sealing plate, which is fixed inside the pre-embedded sleeve by a limiting mechanism, is used to seal the reserved hole;

[0008] The first water-stop ring is sandwiched between the inner bottom plate of the pre-embedded sleeve and the sealing plate on the outer periphery of the reserved hole;

[0009] An operating lever, detachably mounted on the sealing plate, is used to move the sealing plate to the limiting assembly.

[0010] Preferably, the limiting mechanism is distributed in several groups around the sealing plate, including a support part, a first movable rod, and a stiffening assembly. The support part is fixedly mounted on the inner bottom plate of the pre-embedded sleeve. The first movable rod is located between the stiffening assembly and the sealing plate and is connected to the support part through a rotating shaft. The first movable rod and the sealing plate are respectively provided with a first arc-shaped convex surface and a first arc-shaped groove on their opposing sides. The axis of the first arc-shaped convex surface is parallel to the rotating shaft. The stiffening assembly can press the first arc-shaped convex surface against the first arc-shaped groove.

[0011] Preferably, the stiffening assembly includes a limiting part, a second movable rod, and a return spring. The limiting part is fixedly mounted on the inner bottom plate of the pre-embedded sleeve. The return spring is located between the first movable rod and the second movable rod and is connected to the support rod through the rotating shaft. The second movable rod and the limiting block are respectively provided with a second arc-shaped convex surface and a second arc-shaped groove on their opposing sides. The axis of the second arc-shaped convex surface is parallel to the rotating shaft, and it can rotate around the rotating shaft in the second arc-shaped groove.

[0012] Preferably, the second arc-shaped groove is recessed from the bottom to the top of the pre-embedded sleeve, and the limiting part is provided with a horizontal support surface located at the bottom end of the second arc-shaped groove, and the second movable rod is located above the horizontal support surface.

[0013] Preferably, the stiffening assembly includes a U-shaped seat, the sealed end of which is connected to the rotating shaft; a portion of the second movable rod and the return spring are slidably disposed inside the U-shaped seat.

[0014] Preferably, the inner bottom plate of the pre-embedded sleeve is provided with a guide rod, the guide rod extends in the same direction as the pre-embedded sleeve, and the sealing plate is provided with a guide hole corresponding to the position of the guide rod.

[0015] Preferably, the top of the sealing plate is provided with an internally threaded sleeve, and the end of the operating rod is provided with an externally threaded sleeve that is compatible with it.

[0016] Preferably, at least two sets of second water-stop rings are fitted around the outer periphery of the pre-embedded sleeve, wherein the first water-stop ring is a rubber water-stop ring and the second water-stop ring is a rigid water-stop ring.

[0017] The beneficial effects of this utility model are as follows: This sealing device can achieve the following when the foundation slab of the pre-embedded sleeve and the foundation slab of the structure are poured: the foundation slab of the pre-embedded sleeve and the foundation slab of the structure cover most of the opening of the dewatering well. Then, the sealing plate, the first water-stop ring and the concrete poured in the pre-embedded sleeve are used to seal the reserved hole to prevent groundwater from seeping into the pre-embedded sleeve. At the same time, the second water-stop ring is used to cut off the water that may exist between the outer wall of the pre-embedded sleeve and the gap of the foundation slab of the structure, preventing groundwater from seeping into the top of the foundation slab of the structure. Compared with the prior art where the welding quality is difficult to control, this utility model can effectively seal the dewatering well through the synergistic effect of the above-mentioned structures, prevent water seepage and leakage in the later stage of sealing, and improve the quality of the project. Moreover, the use of this sealing device has low requirements for environmental conditions. It can also be used when the groundwater level is high or when there is pressurized water in the stratum. It is only necessary to remove the water in the pre-embedded sleeve before pouring concrete. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a top view of the pre-embedded sleeve in an embodiment of this utility model;

[0020] Figure 3 This is a side sectional view of the pre-embedded sleeve in an embodiment of this utility model;

[0021] Figure 4 This is a structural diagram of the sealing plate and operating lever in an embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram showing the connection between the sealing plate and the pre-embedded sleeve in an embodiment of this utility model.

[0023] In the picture:

[0024] 1. Embedded sleeve; 1.1. Reserved hole;

[0025] 2. Sealing plate; 2.1. First arc-shaped groove; 2.2. Guide hole;

[0026] 3. Control lever;

[0027] 4. First water-stop ring;

[0028] 5. Second water-stop ring;

[0029] 6. Limiting mechanism; 6.1. Support part; 6.2. First movable rod; 6.21. First arc-shaped convex surface; 6.3. Rotating shaft; 6.4. Limiting part; 6.41. Second arc-shaped groove; 6.42. Horizontal support surface; 6.5. Second movable rod; 6.51. Second arc-shaped convex surface; 6.6. Return spring; 6.7. U-shaped seat;

[0030] 7. Curved circular torus;

[0031] 8. Guide rod;

[0032] 9. Internal threaded sleeve;

[0033] 10. Dewatering wells;

[0034] 11. Structural base plate. Detailed Implementation

[0035] The technical solutions of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0036] In the description of the embodiments of this utility model, it should be understood that the terms "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that unless otherwise expressly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model through specific circumstances.

[0037] Reference Appendix Figure 1-5 This utility model provides a sealing device for a dewatering well in a structural base plate, comprising: a pre-embedded sleeve 1, a sealing plate 2, an operating rod 3, a first water-stop ring 4, and a limiting mechanism 6. The pre-embedded sleeve 1 has an inner base plate with a reserved hole 1.1 for removing equipment such as a water pump from the dewatering well 10. The limiting mechanism 6 and the sealing plate 2 are located inside the pre-embedded sleeve 1. The sealing plate 2 is used to seal the reserved hole 1.1 after the water pump or other equipment is removed, and the limiting mechanism 6 is used to fix the sealing plate 2. The pre-embedded sleeve 1 is used to effectively seal the reserved hole 1.1; the operating rod 3 is detachably connected to the sealing plate 2, so that when a person holds the top of it, the sealing plate 2 located at the bottom of it can be gradually moved down from the top of the pre-embedded sleeve to the limiting mechanism 6; the first water-stop ring 4 is located on the inner bottom plate of the pre-embedded sleeve 1. When the sealing plate 2 is fixed in the pre-embedded sleeve 1 by the limiting mechanism 6, the first water-stop ring 4 is clamped on the outer periphery of the reserved hole 1.1 by the inner bottom plate of the pre-embedded sleeve 1 and the sealing plate 2.

[0038] During construction, the pre-embedded sleeve 1 is embedded in the structural base slab 11, and the bottom end of the pre-embedded sleeve 1 extends into the dewatering well 10. That is, the outer diameter of the pre-embedded sleeve 1 should be smaller than the inner diameter of the dewatering well 10. When it is necessary to seal the dewatering well, the sealing plate 2 and the operating rod 3 are connected and fastened. The operating rod 3 is used to transport the sealing plate 2 downward to the limiting mechanism 6 in the pre-embedded sleeve 1, so that the limiting mechanism 6 fixes the sealing plate 2 and seals the reserved hole 1.1. Then, the operating rod 3 is separated from the sealing plate 2, leaving the sealing plate 2 in the pre-embedded sleeve 1. Concrete is then poured into the pre-embedded sleeve 1. Before the construction site is built, the part of the pre-embedded sleeve 1 that is higher than the finished surface of the structural base slab 11 is cut off, thus completing the sealing operation of the dewatering well 10.

[0039] The above-mentioned operation of sealing the reserved hole 1.1 with the sealing plate 2 has no requirements on the environment inside the embedded sleeve 1. That is, it can be operated whether there is water or not in the embedded sleeve 1. If there is water in the embedded sleeve 1, the water in the embedded sleeve 1 can be pumped out after the sealing plate 2 seals the reserved hole 1.1. The water in the dewatering well 10 will not continue to enter the embedded sleeve 1 due to the obstruction of the first water-stopping ring 4. Furthermore, concrete will be poured into the embedded sleeve 1 afterward to ensure the sealing effect of the dewatering well 10.

[0040] To prevent water seepage at the connection between the outer wall of the pre-embedded sleeve 1 and the structural base plate 11, this embodiment also provides at least two sets of second water-stop rings 5 ​​on the outer wall of the pre-embedded sleeve 1. In this embodiment, the first water-stop ring 4 is a rubber water-stop ring. In practice, the first water-stop ring 4 can be connected to the sealing plate 2 by adhesive. The first water-stop ring 4 is sealed tightly by the opposing pressure of the inner base plate of the pre-embedded sleeve 1 and the sealing plate 2, so as to ensure that groundwater cannot seep into other parts of the pre-embedded sleeve 1. The second water-stop ring 5 is a rigid water-stop ring, which is used to cut off the seepage of water in the gap between the outer wall of the pre-embedded sleeve 1 and the structural base plate 11.

[0041] In this embodiment, the limiting mechanism 6 is distributed in several groups around the sealing plate 2, including a support part 6.1, a first movable rod 6.2, and a stiffening assembly. The support part 6.1 is fixedly mounted on the inner bottom plate of the pre-embedded sleeve 1. The first movable rod 6.2 is located between the stiffening assembly and the sealing plate 2 and is connected to the support part 6.1 through a rotating shaft 6.3. The first movable rod 6.2 and the sealing plate 2 are respectively provided with a first arc-shaped convex surface 6.21 and a first arc-shaped groove 2.1 on their opposite sides. The axis of the first arc-shaped convex surface 6.21 is parallel to the rotating shaft 6.3. The stiffening assembly can press the first arc-shaped convex surface 6.21 against the first arc-shaped groove 2.1.

[0042] The first arc-shaped groove 2.1 can be directly formed on the side edge of the sealing plate 2, or as shown in the attached figure. Figure 4As shown, a curved ring 7 is constructed above the sealing plate 2. The outer surface of the curved ring 7 is a first arc-shaped groove 2.1. The first arc-shaped groove 2.1 is recessed from the outer surface of the curved ring 7 to the inner surface. When the curved ring 7 moves from top to bottom with the sealing plate 2, the outermost edge of the first arc-shaped groove 2.1 presses down on the first arc-shaped convex surface 6.21, causing the first movable rod 6.2 to rotate around the rotation axis 6.3. This reduces the lateral distance between the first arc-shaped convex surface 6.21 and the rotation axis 6.3. When the lateral distance between the first arc-shaped convex surface 6.21 and the rotation axis 6.3 is equal to the lateral distance between the outer edge of the first arc-shaped groove 2.1 and the rotation axis 6.3 (see attached diagram). Figure 5 As the curved ring 7 descends slightly with the sealing plate 2, the first arc-shaped convex surface 6.21 will enter the first arc-shaped groove 2.1. Under the action of the stiffening component, it cannot separate from the first arc-shaped groove 2.1, thus fixing the sealing plate 2 and preventing the rubber waterstop ring from moving upward under the elastic action.

[0043] To ensure the proper installation and fixation of the sealing plate 2, the length of the first movable rod 6.2, the height of the support 6.1, the curvature of the first arc-shaped groove 2.1, the height of the first water-stop ring 4, and the thickness of the sealing plate 2 should be comprehensively considered and designed. This design ensures that when the first movable rod 6.2 rotates downwards until the lateral distance between the first arc-shaped convex surface 6.21 and the rotating shaft 6.3 is equal to the lateral distance between the outer edge of the first arc-shaped groove 2.1 (or the outermost edge of the sealing plate 2) and the rotating shaft 6.3), the first movable rod 6.2 still does not contact the inner bottom plate of the pre-embedded sleeve. More preferably, during the design, after the sealing plate 2 is installed, the axis of the first movable rod 6.2 can be made horizontal, and the top surface of the curved ring 7 can be flush with the top surface of the first movable rod 6.2.

[0044] As described above, the stiffening assembly can apply force to the first movable rod 6.2, causing the first arc-shaped convex surface 6.21 to abut against the first arc-shaped groove 2.1. However, considering that the first movable rod 6.2 needs to have the freedom to rotate downwards, some feasible technical solutions configure the stiffening assembly to include a limiting part 6.4, a second movable rod 6.5, and a return spring 6.6. The limiting part 6.4 is fixedly mounted on the inner bottom plate of the pre-embedded sleeve 1; the return spring 6.6 is located between the first movable rod 6.2 and the second movable rod 6.5, and is connected to the support rod through the rotating shaft 6.3; the second movable rod 6.5 and the limiting part 6.4 are respectively provided with a second arc-shaped convex surface 6.51 and a second arc-shaped groove 6.41 on their opposing sides. The axis of the second arc-shaped convex surface 6.51 is parallel to the rotating shaft 6.3, and it can rotate around the rotating shaft 6.3 in the second arc-shaped groove 6.41.

[0045] In practice, the sealing plate 2 presses down on the first arc-shaped convex surface 6.21, causing the first movable rod 6.2 to rotate. This, in turn, drives the return spring 6.6 and the second movable rod 6.5 to rotate. During the rotation of the second movable rod 6.5, the lateral distance between the second arc-shaped convex surface 6.51 and the rotation axis decreases due to the limiting effect of the second arc-shaped groove 6.41, causing the return spring 6.6 to be compressed. Once the first arc-shaped convex surface 6.21 enters the first arc-shaped groove 2.1, no further force is required on the sealing plate 2 and the operating rod 3. Due to the reduced compressive force on the first arc-shaped convex surface 6.21, under the action of the return spring 6.6, the second movable rod 6.5, the return spring 6.6, and the first movable rod 6.2 rotate in opposite directions. The return spring 6.6 then applies a compressive force to the first arc-shaped convex surface 6.21 through the first movable rod 6.2, ensuring stable contact between it and the first arc-shaped groove 2.1, thus achieving stable installation of the sealing plate 2.

[0046] Due to the structural characteristics of the return spring 6.6, it is prone to bending when rotating with the first movable rod 6.2. Therefore, the clamping assembly in this embodiment is provided with a U-shaped seat 6.7. The sealed end of the U-shaped seat 6.7 is connected to the rotating shaft 6.3. Part of the second movable rod 6.5 and the return spring 6.6 are slidably disposed inside the U-shaped seat 6.7. The inner wall of the U-shaped seat 6.7 limits the return spring 6.6 and the second movable rod 6.5, so that when the first movable rod 6.2 rotates, it directly drives the U-shaped seat 6.7 to rotate, while the return spring 6.6 extends and retracts inside the U-shaped seat 6.7, and one end of the second movable rod 6.5 slides inside the U-shaped seat 6.7.

[0047] In some preferred implementations, the first movable rod 6.2 and the second movable rod 6.5 are coaxial, and the U-shaped seat 6.7 is integrally formed with the first movable rod 6.2.

[0048] In some preferred embodiments, the second arc-shaped groove 6.41 is recessed from the bottom to the top of the pre-embedded sleeve 1. The limiting part 6.4 is provided with a horizontal support surface 6.42 located at the bottom end of the second arc-shaped groove 6.41, and the second movable rod 6.5 is located above the horizontal support surface 6.42. When the return spring 6.6 drives the second movable rod 6.5 and the first movable rod 6.2 to reset, the horizontal support surface 6.42 can restrict the second movable rod 6.5 from continuing to rotate downward, that is, ultimately making the first movable rod 6.2 and the second movable rod 6.5 in a horizontal state.

[0049] To facilitate the rapid installation of the sealing plate 2, this embodiment also provides several guide rods 8 on the inner bottom plate of the pre-embedded sleeve 1. The guide rods 8 extend in the same direction as the pre-embedded sleeve 1, and the sealing plate 2 is provided with guide holes 2.2 corresponding to the positions of the guide rods 8. During the process of pushing the sealing plate 2 downward using the operating rod 3, the guide rods 8 are inserted into the guide holes 2.2 to achieve rapid positioning of the sealing plate 2 and guide the continued downward movement of the sealing plate 2, so as to ensure that the first arc-shaped convex surface 6.21 and the first arc-shaped groove 2.1 are effectively and accurately connected.

[0050] To facilitate the quick installation and removal of the operating lever 3, this embodiment features an internally threaded sleeve 9 at the top of the sealing plate 2 and an externally threaded sleeve at the end of the operating lever 3. Installing the sealing plate 2 within the pre-embedded sleeve involves applying force vertically, while installing and removing the operating lever 3 involves applying force by rotating it around a vertical axis. These two processes do not interfere with each other, ensuring effective connection between the sealing plate 2 and the operating lever 3 during installation. Furthermore, it ensures that the operating lever 3 will not pull the sealing plate 2 upwards during removal, preventing disturbance to the connection between the sealing plate 2 and the limiting mechanism 6.

[0051] When using the above-mentioned device for construction, the bottom end of the pre-embedded sleeve 1 should be inserted into the dewatering well 10 to a certain depth; the top end of the pre-embedded sleeve 1 should be higher than the finished surface of the structural base slab 11 to prevent concrete from falling into the pre-embedded sleeve 1 when the structural base slab 11 is poured; the diameter of the reserved hole 1.1 should meet the size of the water pump so that it can be easily removed.

[0052] When using the above-mentioned device for construction:

[0053] The pre-embedded sleeve 1 is pre-embedded into the structural base plate 11, and the bottom end of the pre-embedded sleeve 1 extends into the dewatering well 10;

[0054] Once the conditions for stopping precipitation are met, stop precipitation and remove the water pump from the precipitation well 10. Connect and secure the sealing plate 2 and the operating rod 3. Use the operating rod 3 to transport the sealing plate 2 downward to the guide rod 8 in the pre-embedded sleeve 1, so that the guide rod 8 is inserted into the guide hole 2.2 to achieve the positioning and guidance of the sealing plate 2.

[0055] Continue to use the operating lever 3 to convey the sealing plate 2 downward to the limiting mechanism 6, so that the limiting mechanism 6 fixes the sealing plate 2, thereby sealing the reserved hole 1.1;

[0056] Rotate the operating lever 3 to separate the operating lever 3 from the sealing plate 2, so that the sealing plate 2 remains in the pre-embedded sleeve 1, and then pour concrete into the pre-embedded sleeve 1.

[0057] Before construction begins, the portion of the pre-embedded sleeve 1 that extends above the finished surface of the structural base slab 11 is cut off, thus completing the sealing operation of the dewatering well 10.

[0058] If groundwater flows into the embedded sleeve 1 from the reserved hole 1.1 during the installation of the sealing plate 2, the water in the embedded sleeve 1 can be pumped out using an external water pump after the sealing plate 2 is installed, and then the operating rod 3 can be removed and concrete poured.

[0059] Compared with the prior art, the present invention has at least the following beneficial effects: The sealing device can achieve the following when the base plate of the pre-embedded sleeve 1 and the base plate of the structure 11 are poured: the base plate of the pre-embedded sleeve 1 and the base plate of the structure 11 cover most of the opening of the dewatering well 10. Then, the sealing plate 2, the first water-stop ring 4 and the concrete poured in the pre-embedded sleeve 1 are used to seal the reserved hole 1.1 to prevent groundwater from seeping into the pre-embedded sleeve 1. At the same time, the second water-stop ring 5 is used to cut off the water that may exist between the outer wall of the pre-embedded sleeve 1 and the gap of the base plate of the structure 11 to prevent groundwater from seeping into the top of the base plate of the structure 11. Compared with the prior art where the welding quality is difficult to control, the present invention can effectively seal the dewatering well 10 through the synergistic effect of the above structures, prevent water seepage and leakage in the later stage of sealing, and improve the quality of the project. Moreover, the use of the sealing device has low requirements for environmental conditions. It can also be used when the groundwater level is high or when there is pressurized water in the stratum. It is only necessary to remove the water in the pre-embedded sleeve 2 before pouring concrete.

[0060] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for sealing downwells in a structural base plate, characterized in that, include: An embedded sleeve is provided, wherein a reserved hole is provided on the inner bottom plate of the embedded sleeve; A sealing plate, which is fixed inside the pre-embedded sleeve by a limiting mechanism, is used to seal the reserved hole; The first water-stop ring is sandwiched between the inner bottom plate of the pre-embedded sleeve and the sealing plate on the outer periphery of the reserved hole; An operating lever, detachably mounted on the sealing plate, is used to move the sealing plate to the limiting assembly.

2. The structural base plate downwell sealing device according to claim 1, characterized in that, The limiting mechanism is distributed in several groups around the sealing plate, including a support part, a first movable rod, and a stiffening assembly. The support part is fixedly mounted on the inner bottom plate of the pre-embedded sleeve. The first movable rod is located between the stiffening assembly and the sealing plate and is connected to the support part through a rotating shaft. The first movable rod and the sealing plate are respectively provided with a first arc-shaped convex surface and a first arc-shaped groove on their opposing sides. The axis of the first arc-shaped convex surface is parallel to the rotating shaft. The stiffening assembly can press the first arc-shaped convex surface against the first arc-shaped groove.

3. The structural base plate downwell sealing device according to claim 2, characterized in that, The stiffening assembly includes a limiting part, a second movable rod, and a return spring. The limiting part is fixedly mounted on the inner bottom plate of the pre-embedded sleeve. The return spring is located between the first movable rod and the second movable rod and is connected to the support rod through the rotating shaft. The second movable rod and the limiting block are respectively provided with a second arc-shaped convex surface and a second arc-shaped groove on their opposing sides. The axis of the second arc-shaped convex surface is parallel to the rotating shaft, and it can rotate around the rotating shaft in the second arc-shaped groove.

4. The structural base plate downwell sealing device according to claim 3, characterized in that, The second arc-shaped groove is recessed from the bottom to the top of the pre-embedded sleeve, and the limiting part is provided with a horizontal support surface located at the bottom end of the second arc-shaped groove, and the second movable rod is located above the horizontal support surface.

5. The structural base plate downwell sealing device according to claim 3 or 4, characterized in that, The stiffening assembly includes a U-shaped seat, the sealed end of which is connected to the rotating shaft; a portion of the second movable rod and the return spring are slidably disposed inside the U-shaped seat.

6. The structural base plate downwell sealing device according to claim 5, characterized in that, The inner bottom plate of the pre-embedded sleeve is provided with a guide rod, which extends in the same direction as the pre-embedded sleeve, and the sealing plate is provided with a guide hole corresponding to the position of the guide rod.

7. The structural base plate downwell sealing device according to claim 6, characterized in that, The top of the sealing plate is provided with an internally threaded sleeve, and the end of the operating rod is provided with an externally threaded sleeve that is compatible with it.

8. The structural base plate downwell sealing device according to any one of claims 1-4 and 5-6, characterized in that, At least two sets of second water-stop rings are fitted around the outer periphery of the pre-embedded sleeve. The first water-stop ring is a rubber water-stop ring, and the second water-stop ring is a rigid water-stop ring.

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