Segmented water filtration and precipitation well structure

Abstract

A sectional filter water dewatering well structure relates to the technical field of foundation pit dewatering, including the well pipe of water -tightness which is vertically arranged in the dewatering well, the lower end of the well pipe is equipped with the filter water pipe, the filter water pipe is divided into three pipe sections from top to bottom, the upper pipe section is the tapered filter pipe which is narrow at the top and wide at the bottom, the middle pipe section is the wire-wound filter pipe, the lower pipe section is the inverted tapered filter pipe which is wide at the top and narrow at the bottom, the lower end of the filter water pipe is equipped with the bottom pipe, the bottom pipe is the solid pipe which is closed at the lower end and the pipe wall is water -tight, a plurality of water inlet holes are arranged on the outer pipe wall of the upper pipe section and the lower pipe section of the filter water pipe at intervals, the annular space between the well pipe and the filter water pipe and the dewatering well is filled with the pipe outer filter material layer which is used for filtering the particulate matter in the underground water, and the upper portion of the pipe outer filter material layer is filled with the water stop layer, the sectional filter water dewatering well structure is suitable for the construction of deep foundation pit.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit dewatering technology, and in particular to a segmented filter dewatering well structure. Background Technology

[0002] Well dewatering technology is a conventional method for controlling confined water. In existing suspended curtain dewatering systems, the length of the filter pipe in the dewatering well is closely related to environmental deformation control. Most existing dewatering well filter pipes use a uniform cross-section structure (such as circular hole filter pipes or wire-wound filter pipes). These types of filter pipes suffer from problems such as small inlet area, high flow resistance, and uneven water pressure distribution. In practice, increasing the water output of the dewatering well requires increasing the length of the filter pipe, which can lead to environmental risks such as ground subsidence and piping. Although shorter filter pipes are more conducive to reducing disturbance to the surrounding strata, they cannot meet the water output requirements of a single well. Existing technologies typically use grouting or concrete injection to strengthen the well wall sealing, but these methods are costly, and their sealing tends to weaken further with changes in excavation depth. Therefore, under the condition of limited total filter pipe length, how to increase the water output of a single well and control the risk of well wall seepage becomes the core issue in engineering design. Utility Model Content

[0003] In view of the defects existing in the prior art, the technical problem to be solved by this utility model is to provide a segmented water filtration and dewatering well structure that can achieve high water output with a shorter filter tube and reduce the probability of water overflow.

[0004] To solve the above-mentioned technical problems, this utility model provides a segmented filter dewatering well structure, including a watertight well pipe vertically placed inside the dewatering well, wherein a filter pipe is provided at the lower end of the well pipe, wherein: The filter pipe is divided into three sections from top to bottom. The upper section is a frustum-shaped filter pipe that is narrow at the top and wide at the bottom. The middle section is a wire-wound filter pipe. The lower section is an inverted frustum-shaped filter pipe that is wide at the top and narrow at the bottom. The lower end of the filter pipe is provided with a bottom pipe, which is a solid pipe with a closed bottom and impermeable walls. Multiple water inlet holes are spaced apart on the outer wall of both the upper and lower sections of the filter pipe. The annular space between the well pipe and the filter pipe and the dewatering well is filled with an external filter material layer for filtering particulate matter in the groundwater, and a water-stopping layer is filled on top of the external filter material layer.

[0005] Furthermore, the diameter of the water inlet hole is 5~15mm, and the spacing between the water inlet holes is 15~45mm.

[0006] Furthermore, the outer wall of the wound filter tube is wound with winding wire, which is stainless steel wire or nylon wire, with a wire diameter of 0.8~2mm and a winding spacing of 0.5~1.5mm.

[0007] The segmented dewatering well structure provided by this utility model adopts a filter pipe structure with conical filter pipe sections. When the filter pipe operates in the dewatering well, it can reduce the lateral seepage pressure on the well wall and effectively balance the water pressure above and below the well wall, thereby reducing the probability of water seepage and piping. At the same time, the conical filter pipe section also shortens the water flow seepage path, increases the water collection area, reduces the resistance during water flow seepage, and can increase the water output. Thus, the water output requirements can be met even with a shorter filter pipe, and the disturbance to the surrounding strata is reduced. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the segmented filtration and dewatering well structure according to an embodiment of the present invention. Detailed Implementation

[0009] The embodiments of this utility model are described in further detail below with reference to the accompanying drawings. However, these embodiments are not intended to limit this utility model. Any similar structures or variations thereof that adopt this utility model should be included in the protection scope of this utility model. The commas in this utility model all indicate the relationship between and.

[0010] like Figure 1 As shown in the figure, the segmented filter dewatering well structure provided by this utility model embodiment includes a watertight well pipe 5 vertically placed inside the dewatering well, and a filter pipe is provided at the lower end of the well pipe 5. The filter pipe is divided into three sections from top to bottom. The upper section 1 is a frustum-shaped filter pipe that is narrow at the top and wide at the bottom. The middle section 2 is a wire-wound filter pipe. The lower section 3 is an inverted frustum-shaped filter pipe that is wide at the top and narrow at the bottom. The lower end of the filter pipe is provided with a bottom pipe 4, which is a solid pipe with a closed bottom and impermeable walls. Multiple water inlet holes are spaced apart on the outer pipe walls of both the upper pipe section 1 and the lower pipe section 3 of the filter pipe. The annular space between the well pipe 5 and the filter pipe and the dewatering well is filled with an external filter material layer 6 for filtering particulate matter in the groundwater, and a water-stopping layer 7 is filled on top of the external filter material layer 6.

[0011] In this embodiment of the utility model, the diameter of the water inlet hole is 5~15mm, the spacing between the water inlet holes is 15~45mm, and the outer wall of the wire-wound filter tube is wound with winding wire, which is stainless steel wire or nylon wire, the wire diameter is 0.8~2mm, and the winding spacing is 0.5~1.5mm.

[0012] In this embodiment of the utility model, when dewatering is carried out in a dewatering well, the well pipe 5 and the filter pipe are first lowered into the dewatering well. Then, in the annular space between the well pipe 5 and the filter pipe and the dewatering well, the outer filter material layer 6 is first backfilled, and then the water-stopping layer 7 is backfilled. The outer filter material layer 6 is set at the confined aquifer 9, and the water-stopping layer 7 is set at the water-proof layer 8. When pumping water into the well pipe 5, the pressurized water in the middle of the confined aquifer 9 directly enters the middle section 2 of the filter pipe for dewatering. The pressurized water in the lower part of the confined aquifer 9 can enter the lower section 3 of the filter pipe vertically upwards, shortening the seepage path and dispersing the pressure of the lower pressurized water. The interface water between the aquitard 8 and the aquifer 9 can enter the upper section 1 of the filter pipe vertically downwards, shortening the seepage path and balancing the water pressure below the aquitard 8, thus preventing lateral seepage damage to the well wall. Furthermore, the frustum-shaped upper section 1 and lower section 3 increase the water collection area, reducing the resistance during water flow seepage. With the coordinated action of the upper section 1, middle section 2, and lower section 3, dewatering can be carried out under relatively balanced water pressure, effectively preventing water overflow accidents, limiting the length of the filter pipe, achieving the water output requirements with a shorter filter pipe, improving water output efficiency, and reducing disturbance to the surrounding strata.

[0013] Impurities carried by the water entering the filter pipe settle to the bottom of the bottom pipe 4 due to their own gravity, which can prevent siltation and blockage in the well.

Claims

1. A segmented filtration and dewatering well structure, comprising a watertight well pipe vertically installed inside the dewatering well, wherein a filter pipe is provided at the lower end of the well pipe, characterized in that: The filter pipe is divided into three sections from top to bottom. The upper section is a frustum-shaped filter pipe that is narrow at the top and wide at the bottom. The middle section is a wire-wound filter pipe. The lower section is an inverted frustum-shaped filter pipe that is wide at the top and narrow at the bottom. The lower end of the filter pipe is provided with a bottom pipe, which is a solid pipe with a closed bottom and impermeable walls. Multiple water inlet holes are spaced apart on the outer wall of both the upper and lower sections of the filter pipe. The annular space between the well pipe and the filter pipe and the dewatering well is filled with an external filter material layer for filtering particulate matter in the groundwater, and a water-stopping layer is filled on top of the external filter material layer.

2. The segmented filtration and dewatering well structure according to claim 1, characterized in that: The diameter of the water inlet hole is 5~15mm, and the spacing between the water inlet holes is 15~45mm.

3. The segmented filtration and dewatering well structure according to claim 1, characterized in that: The outer wall of the wound filter tube is wound with winding wire, which is stainless steel wire or nylon wire, with a wire diameter of 0.8~2mm and a winding spacing of 0.5~1.5mm.

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