Novel precipitation well sealing device

Abstract

The utility model provides a novel dewatering well sealing device which is structurally characterized in that a primary sealing structure is arranged, a steel pipe is downwards inserted into a dewatering well pipe, a water stop valve is arranged at a pipe opening in the top end, a distance is reserved between the water stop valve and the top end of a dewatering well in the well depth direction, and a first backfilling layer and a second backfilling layer are sequentially backfilled in the dewatering well from the elevation of the bottom end of a bottom plate structure; a secondary plugging structure is arranged, a steel door cover is tightly arranged on a second-section water stop flange at the top end of the dewatering well in a matched and surrounding mode, a circle of annular rubber sealing plate is clamped between the steel door cover and the second-section water stop flange to form sealing, the steel door cover and the second-section water stop flange are fastened through bolts, and a reserved hole is densely filled with waterproof mortar to form a waterproof mortar filling layer; a waterproof structure composed of a waterproof coating layer and a waterproof roll is arranged. The dewatering well plugging device can tightly plug the dewatering well, is good in water leakage prevention effect, and provides reliable guarantee for smooth follow-up construction of the structure.

Description

Technical Field

[0001] The utility model relates to a novel well sealing device for a precipitation well. Background Art

[0002] With the continuous rise of subway and other projects, the poor foundations faced by foundation pit projects have become increasingly complex. During the construction of foundation pits, dewatering wells play an important role in pumping out groundwater and ensuring the safety and stability of foundation pits. The general design scheme for plugging ordinary dewatering wells is to use a high-power water pump to dewater during plugging. After the water is dewatered to the bottom of the pipe, the water pump is removed in time, and then concrete is poured to fill the well pipe, and a sealing steel plate is welded on top. The top is then filled with polymer cement mortar.

[0003] This solution is only effective for plugging precipitation wells with low precipitation and small water output. For soil layers with deep foundation pits, high water pressure, and good permeability, if this solution is adopted, groundwater will penetrate the filling concrete and cause the well plugging to fail. In addition, when the top height is limited, the solution is limited by space and it is not convenient to inject grout into the precipitation well pipe. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a new type of precipitation well sealing device, which provides an effective new solution for the sealing of precipitation wells, can achieve tight sealing of precipitation wells, has good anti-leakage effect, and provides reliable guarantee for the smooth progress of subsequent construction of the structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A new type of well sealing device for dewatering wells has the following structural features:

[0007] A primary plugging structure is provided, the primary plugging structure comprising a steel pipe, a water stop valve, a first backfill layer, and a second backfill layer. The steel pipe is completely built into the precipitation well along the well depth direction, the bottom pipe opening is downwardly inserted into the precipitation well pipe at a height position below the bottom plate structure, the top pipe opening is provided with a water stop valve, and a distance is left between the top of the precipitation well and the top of the precipitation well along the well depth direction. The precipitation well is backfilled with micro-expansive concrete from the bottom elevation of the bottom plate structure to the height position below the water stop valve to form the first backfill layer, and the micro-expansive concrete is backfilled from the top elevation of the first backfill layer to the top of the precipitation well to form the second backfill layer;

[0008] A secondary plugging structure is provided, which includes a second water-stop flange, a rubber sealing plate, a steel door cover, bolts, a steel mesh sheet, and a waterproof mortar filling layer. A ring of the second water-stop flange is provided at the top end of the dewatering well. The steel door cover is in the shape of a "C"-shaped plate with an opening facing downwards, and is tightly and fittingly arranged around the second water-stop flange. A ring of annular rubber sealing plate is clamped between them to form a seal, and is fastened to the second water-stop flange through bolts. The bottom plate structure is correspondingly provided with a hole for installing the secondary plugging structure. The steel mesh sheet is laid at the top end of the hole, and the hole is filled with waterproof mortar to form the waterproof mortar filling layer;

[0009] A waterproof structure is provided, which includes a waterproof coating layer and a waterproof coiled material. Taking the elevation of the bottom end of the first water-stop flange of the dewatering well as the boundary, below the boundary, a waterproof coating is applied to the outer well wall of the dewatering well located in the bottom plate structure and the bottom end of the bottom plate structure to form a waterproof coating layer, and a waterproof coiled material is laid outside the waterproof coating layer.

[0010] The structural features of the present utility model also lie in:

[0011] The steel pipe is centrally placed inside the dewatering well.

[0012] The top end of the steel pipe is above the first backfill layer.

[0013] The size of the hole is 80cm × 800cm × 25cm.

[0014] Compared with the prior art, the beneficial effects of the present utility model are reflected in:

[0015] 1. It has a wide range of applications;

[0016] Whether it is a dewatering well in a soil layer with small precipitation and low water output, or a dewatering well in a soil layer with a deep foundation pit, high water pressure, and good formation permeability, by using the new dewatering well sealing device of the present utility model, a good and effective plugging effect can be achieved, with excellent water leakage prevention effect, effectively avoiding the situation that the groundwater breaks through the filling concrete and causes the sealing of the well to fail, and ensuring the subsequent smooth construction of the structure; 2. The present utility model is easy to implement, has convenient construction, and is suitable for popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present utility model.

[0018] In the figure:

[0019] 1 dewatering well; 11 first water-stop flange; 12 second water-stop flange; 2 bottom plate structure;

[0020] 31 steel pipe; 32 water-stop valve; 33 first backfill layer; 34 second backfill layer;

[0021] 41 Rubber sealing plate; 42 Steel door cover; 43 Bolt; 44 Steel bar mesh; 45 Waterproof mortar filling layer;

[0022] 51 Waterproof coating layer; 52 Waterproof coiled material. Specific implementation mode

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figure 1 , the structure of the new type of well plugging device for dewatering wells in this embodiment is as follows:

[0025] A primary plugging structure is provided. The primary plugging structure includes a steel pipe 31, a water stop valve 32, a first backfill layer 33, and a second backfill layer 34. The steel pipe 31 is completely placed inside the dewatering well 1 along the well depth direction, and the bottom pipe orifice is inserted downward into the pipe of the dewatering well 1 at a height position below the bottom plate structure 2. A water stop valve 32 is provided at the top pipe orifice, and there is a spacing along the well depth direction between the top pipe orifice and the top of the dewatering well 1. In the dewatering well 1, micro-expansion concrete is backfilled from the bottom elevation of the bottom plate structure 2 to the height position below the water stop valve 32 to form the first backfill layer 33, and micro-expansion concrete is backfilled from the top elevation of the first backfill layer 33 to the top of the dewatering well 1 to form the second backfill layer 34;

[0026] A secondary plugging structure is provided, which includes a second-section water stop flange 12, a rubber sealing plate 41, a steel door cover 42, bolts 43, a steel bar mesh 44, and a waterproof mortar filling layer 45. A circle of second-section water stop flanges 12 is provided at the top of the dewatering well 1. The steel door cover 42 is in the shape of a "C" - shaped plate with an opening facing downward, and is tightly arranged around the second-section water stop flange 12 in a matching manner. A sealing is formed by sandwiching a circle of annular rubber sealing plate 41 between it and the second-section water stop flange 12, and it is fastened to the second-section water stop flange 12 through bolts 43. The bottom plate structure 2 is correspondingly provided with a hole for installing the secondary plugging structure. A steel bar mesh 44 is laid at the top of the hole, and the inside of the hole is filled and compacted with waterproof mortar to form a waterproof mortar filling layer 45;

[0027] A waterproof structure is provided, which includes a waterproof coating layer 51 and a waterproof coiled material 52. Taking the bottom elevation of the first-section water stop flange 11 of the dewatering well 1 as the boundary, below the boundary, on the outer well wall of the dewatering well 1 located inside the bottom plate structure 2 and the bottom of the bottom plate structure 2, a waterproof coating is applied to form a waterproof coating layer 51, and a waterproof coiled material 52 is laid outside the waterproof coating layer 51.

[0028] In the specific implementation, the corresponding structural settings also include:

[0029] The steel pipe 31 is centrally built into the precipitation well 1 .

[0030] The top end of the steel pipe 31 is located above the first backfill layer 33 .

[0031] The hole size is 80cm×800cm×25cm.

[0032] The following is a construction example of this device for reference:

[0033] Waterproofing: the outer wall of the precipitation well 1 in the area of ​​the bottom plate structure 2 is painted with waterproof paint to the height of the bottom end of the first section of the water stop flange 11, and the waterproof paint is painted at the bottom of the bottom plate structure 2. After the painting is completed, the waterproof membrane 52 is laid;

[0034] The drainage well 1 pipe is plugged in two steps:

[0035] For the first plugging, a steel pipe 31 with a water stop valve 32 at the top end is inserted into the precipitation well 1, and the micro-expansion concrete is backfilled to the height of the top end of the steel pipe 31. At this time, the water stop valve 32 is exposed, and the first backfill layer 33 is formed. When preparing for the second plugging, the water stop valve 32 is first closed, and the micro-expansion concrete is backfilled again to the top of the precipitation well 1 on the basis of the first backfill layer 33, so as to form the second backfill layer 34, and the first plugging is completed;

[0036] For the second plugging, a hole is reserved at the position of the precipitation well 1 when pouring the base plate structure 2 to facilitate the second plugging, and then a circle of annular rubber sealing plate 41 is laid on the second section water-stop flange 12, and the second section water-stop flange 12 is covered with the finished steel door cover 42. After the two are fastened with bolts 43, a layer of steel mesh 44 is laid on the top of the hole, and the hole is filled densely with waterproof mortar.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A novel device for sealing a precipitation well, characterized in that: A primary sealing structure is provided, and the primary sealing structure includes a steel pipe, a water stop valve, a first backfill layer, and a second backfill layer. The steel pipe is completely placed inside the precipitation well along the well depth direction, the bottom pipe orifice is inserted downward into the precipitation well pipe at a height position below the bottom plate structure, a water stop valve is provided at the top pipe orifice, and there is a spacing along the well depth direction between the top pipe orifice and the top of the precipitation well. In the precipitation well, micro-expansive concrete is backfilled from the bottom elevation of the bottom plate structure to the height position below the water stop valve to form the first backfill layer, and micro-expansive concrete is backfilled from the top elevation of the first backfill layer to the top of the precipitation well to form the second backfill layer; A secondary sealing structure is provided, including a second water stop flange, a rubber sealing plate, a steel door cover, bolts, a steel mesh sheet, and a waterproof mortar filling layer. A circle of the second water stop flange is provided at the top of the precipitation well. The steel door cover is in the shape of a "匚"-shaped plate with an opening facing downward, and is tightly arranged around the second water stop flange in a matching manner, and forms a seal with the second water stop flange by sandwiching a circular rubber sealing plate, and is fastened to the second water stop flange by bolts. The bottom plate structure is correspondingly provided with a hole for installing the secondary sealing structure, the steel mesh sheet is laid at the top of the hole, and the inside of the hole is filled and compacted with waterproof mortar to form the waterproof mortar filling layer; A waterproof structure is provided, including a waterproof coating layer and a waterproof coiled material. Taking the bottom elevation of the first water stop flange of the precipitation well as the boundary, below the boundary, a waterproof coating is applied to the outer well wall of the precipitation well located inside the bottom plate structure and the bottom of the bottom plate structure to form a waterproof coating layer, and a waterproof coiled material is laid outside the waterproof coating layer.

2. The novel well sealing device for dewatering wells according to claim 1 is characterized in that: The steel pipe is placed in the precipitation well in the center.

3. The novel dewatering well sealing device according to claim 1 is characterized in that: The top of the steel pipe is above the first backfill layer.

4. The novel well sealing device for dewatering wells according to claim 1 is characterized in that: The size of the hole is 80cm×800cm×25cm.

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