A plugging device based on a well point dewatering system

Abstract

A kind of plugging device based on well point dewatering system, including well pipe, lower filter tube, partition plate, plugging plate and micro-expansion concrete layer;Lower filter tube is arranged in the soil body below bottom plate, and clay is filled in lower filter tube;Well pipe is arranged in bottom plate, and lower end of well pipe is sleeved on lower filter tube;Lower hanging plate is arranged on the inner wall of well pipe, and lower hanging plate is supported on the top end of lower filter tube;Water stop plate is arranged on the outer wall of well pipe;Partition plate is arranged on the top of lower hanging plate in well pipe, and partition plate is connected with lower hanging plate;Exhaust hole is formed in the middle of plate face of partition plate;Micro-expansion concrete layer is filled in well pipe, and located on the top of partition plate, and the top surface of micro-expansion concrete layer is spaced apart from the top surface of well pipe;Plugging plate is plugged in well pipe on the top of micro-expansion concrete layer;Micro-expansion fine stone concrete layer is filled on the top of plugging plate.The utility model solves the technical problems of complicated process and material waste in the process of bottom plate penetrating and well plugging in the construction of traditional dewatering well.

Description

Technical Field

[0001] This utility model belongs to the field of building foundation and foundation engineering, and specifically relates to a sealing device based on a wellpoint dewatering system. Background Technology

[0002] Wellpoint dewatering systems are a technology used in engineering to control groundwater levels and are an important means of groundwater level control. Under normal dewatering well construction conditions, traditional dewatering well construction is still highly practical in conventional geological conditions and general foundation pit projects. However, in complex strata, deep foundation pits, and projects with high environmental protection requirements, traditional dewatering well construction has problems such as cumbersome construction procedures and may lead to insufficient groundwater level drawdown, resulting in instability of the support structure, uplift of the basement floor, or excessive dewatering. Therefore, it is necessary to optimize the system by combining it with modern technology to improve efficiency, reduce costs, and minimize environmental impact. Utility Model Content

[0003] The purpose of this invention is to provide a sealing device based on a wellpoint dewatering system, which aims to solve the technical problems of complicated procedures and material waste in the traditional dewatering well construction process of sealing the well through the bottom plate.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A sealing device based on a wellpoint dewatering system includes a well pipe and a lower filter pipe. The lower filter pipe is installed in the soil below a base plate and filled with clay. The well pipe is installed in the base plate, and its lower end is sleeved on the lower filter pipe. The sealing device also includes a partition plate, a sealing plate, and a micro-expansion concrete layer. Lower hanging plates are spaced circumferentially on the lower part of the inner wall of the well pipe, supporting the top of the lower filter pipe. Water-stop plates are spaced vertically on the outer wall of the well pipe, located inside the base plate. The partition plate is located on top of the lower hanging plates inside the well pipe and is connected to them. A vent hole is provided in the center of the partition plate. The micro-expansion concrete layer fills the well pipe, is located on top of the partition plate, and a gap is left between the top surface of the micro-expansion concrete layer and the top surface of the well pipe. The sealing plate seals the well pipe above the micro-expansion concrete layer. A micro-expansion fine aggregate concrete layer is filled on top of the sealing plate.

[0006] Preferably, a pad layer is provided at the bottom of the base plate; the lower hanging plate is provided on the inner wall of the well pipe at the position corresponding to the pad layer.

[0007] Preferably, the lower hanging plate has an inverted L-shaped cross-section, and the vertical section of the lower hanging plate is welded to the inner wall of the well pipe; the bottom of the partition plate is provided with upper hanging plates at intervals, and the upper hanging plates and the lower hanging plates are arranged at equal intervals; the upper hanging plate has an L-shaped cross-section, and the upper hanging plate and the lower hanging plate are connected together.

[0008] Preferably, the well pipe includes a main pipe section and a transition section; the diameter of the main pipe section is larger than the diameter of the lower filter pipe; the transition section is located at the bottom of the main pipe section and is a variable cross-section pipe section; the upper cross-sectional diameter of the transition section is adapted to the diameter of the main pipe section, and the lower cross-sectional inner diameter of the transition section is adapted to the outer diameter of the lower filter pipe; the transition section is sleeved on the lower filter pipe and welded to the lower filter pipe.

[0009] Preferably, the outer diameter of the waterstop plate is 400mm~450mm, the inner diameter of the waterstop plate is adapted to the outer diameter of the main pipe section, and the thickness of the waterstop plate is not less than 3mm.

[0010] Preferably, a limit plate is provided on one side of the upper hanging plate, and an operating handle is provided on the top surface of the partition plate.

[0011] Compared with the prior art, the present invention has the following features and beneficial effects.

[0012] 1. In the construction of the wellpoint dewatering system, this utility model only needs to optimize the upper solid pipe device in the traditional dewatering well to further enhance the effect of the combination technology of intercepting curtain and dewatering well on groundwater level control, reduce the range of dewatering impact, reduce the risk of settlement, and reduce the impact on the surrounding environment; at the same time, the sealing device can simplify the construction of subsequent dewatering well sealing process, save time and costs, reduce the amount of micro-expansion concrete used, and save construction costs.

[0013] 2. This utility model uses this device to replace the filter pipe at the top of the dewatering well. When filling the filter material, high-quality clay can be directly used to fill below the hanging plate, reducing the amount of micro-expansion concrete used and saving construction costs. At the same time, through the setting of the composite structure of the partition plate and the hanging plate, compared with the traditional clay filling, the filling boundary between micro-expansion concrete and clay is clearly defined by the partition plate, simplifying the construction process, shortening the construction period, and saving time costs.

[0014] 3. When using this device for installation, only the lower filter pipe needs to be centered. The lower mounting plate will then overlap the lower filter pipe, reducing verticality deviation. Furthermore, the overlap between the lower mounting plate and the lower filter pipe will not damage the filter pipe or the well casing itself. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the sealing device based on the wellpoint dewatering system of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the well pipe sleeved on the upper end of the lower filter pipe in this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the partition plate with an upper hanging plate at the bottom.

[0019] Figure 4 This is a schematic diagram of the connection structure between the upper and lower hanging plates in this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the upper hanging plate with a limiting plate on one side in this utility model.

[0021] Attached reference numerals: 1-Well pipe, 1.1-Main pipe section, 1.2-Transition section, 2-Waterstop plate, 3-Upper hanging plate, 4-Lower hanging plate, 5-Soil, 6-Bottom plate, 7-Separation plate, 8-Sealing plate, 9-Micro-expansion fine stone concrete layer, 10-Micro-expansion concrete layer, 11-Clay, 12-Vent hole, 13-Limiting plate, 14-Lower filter pipe, 16-Bedding layer, 17-Operating handle. Detailed Implementation

[0022] like Figure 1-5 As shown, this sealing device based on a wellpoint dewatering system includes a well pipe 1 and a lower filter pipe 14; the lower filter pipe 14 is disposed in the soil 5 below the base plate 6, and is filled with clay 11; the well pipe 1 is disposed in the base plate 6, and the lower end of the well pipe 1 is sleeved on the lower filter pipe 14; the sealing device is characterized by further including a partition plate 7, a sealing plate 8, and a micro-expansion concrete layer 10; the lower part of the inner wall of the well pipe 1 is provided with a lower hanging plate 4 at intervals along the circumference, and the lower hanging plate 4 is supported on the top of the lower filter pipe 14; the well... Waterstop plates 2 are vertically spaced on the outer wall of pipe 1, located inside the bottom plate 6; the partition plate 7 is set on top of the lower hanging plate 4 inside the well pipe 1, and the partition plate 7 is connected to the lower hanging plate 4; an exhaust hole 12 is opened in the middle of the partition plate 7; the micro-expansion concrete layer 10 is filled inside the well pipe 1, located on top of the partition plate 7, and a gap is left between the top surface of the micro-expansion concrete layer 10 and the top surface of the well pipe 1; the sealing plate 8 is sealed inside the well pipe 1 at the top of the micro-expansion concrete layer 10; a micro-expansion fine stone concrete layer 9 is filled on top of the sealing plate 8.

[0023] In this embodiment, a pad 16 is provided at the bottom of the base plate 6; the lower hanging plate 4 is provided on the inner wall of the well pipe 1 at the position corresponding to the pad 16.

[0024] In this embodiment, the lower hanging plate 4 has an inverted L-shaped cross-section, and the vertical plate section of the lower hanging plate 4 is welded to the inner wall of the well pipe 1; the bottom of the partition plate 7 is provided with an upper hanging plate 3 at intervals, and the upper hanging plate 3 and the lower hanging plate 4 are arranged at equal intervals; the upper hanging plate 3 has an L-shaped cross-section, and the upper hanging plate 3 and the lower hanging plate 4 are hooked together.

[0025] In this embodiment, the well pipe 1 includes a main pipe section 1.1 and a transition section 1.2; the diameter of the main pipe section 1.1 is larger than the diameter of the lower filter pipe 14; the transition section 1.2 is located at the bottom of the main pipe section 1.1, and the transition section 1.2 is a variable cross-section pipe section; the upper cross-sectional diameter of the transition section 1.2 is adapted to the diameter of the main pipe section 1.1, and the lower cross-sectional inner diameter of the transition section 1.2 is adapted to the outer diameter of the lower filter pipe 14; the transition section 1.2 is sleeved on the lower filter pipe 14 and welded to the lower filter pipe 14.

[0026] In this embodiment, the outer diameter of the waterstop plate 2 is 400mm~450mm, the inner diameter of the waterstop plate 2 is adapted to the outer diameter of the main pipe section 1.1, and the thickness of the waterstop plate 2 is not less than 3mm.

[0027] In this embodiment, there are three lower hanging plates 4, which are arranged at equal intervals on the inner wall of the well pipe 1. There are three upper hanging plates 3, and the distance between the three upper hanging plates 3 is adapted to the distance between the three lower hanging plates 4. The upper hanging plates 3 and the lower hanging plates 4 are connected by a torsion partition plate 7.

[0028] In this embodiment, a limit plate 13 is provided on one side of the upper hanging plate 3; when the partition plate 7 rotates to its position, it prevents the partition plate 7 from rotating further, ensuring the accurate effective position of the upper hanging plate 3 and the lower hanging plate 4. An operating handle 17 is provided on the top surface of the partition plate 7 to facilitate rotation of the partition plate 7, allowing the upper hanging plate 3 and the lower hanging plate 4 to be engaged. In this embodiment, the main pipe section 1.1 is made of steel pipe with an outer diameter of 273mm and a wall thickness of 4mm; the lower filter pipe 14 is made of steel pipe with an outer diameter of 219mm and a wall thickness of 4mm; the upper outer diameter of the transition section 1.2 is 273mm and the wall thickness is 4mm, while the lower inner diameter is 219mm.

[0029] Meanwhile, the inner diameter of the partition plate 7 is adapted to the outer diameter of the main pipe section. The partition plate 7 is a circular structure with a thickness of 10mm, and an exhaust hole 12 with a diameter of 200mm is set at the center of the circle.

[0030] In this embodiment, the micro-expansion concrete uses conventional concrete graded aggregates, including coarse aggregate (gravel), with a maximum particle size typically ranging from 20mm, 25mm, 31.5mm, or even 40mm (as permitted by engineering requirements and specifications). Its composition includes cement, water, sand, gravel, an expansion agent (and possible admixtures such as water-reducing agents).

[0031] Micro-expansion fine aggregate concrete: This type of concrete does not contain coarse aggregate (pebbles) of ordinary size, or its particle size is strictly limited to a very small range (usually the maximum particle size ≤15mm, commonly 5-10mm). Its composition includes cement, water, fine aggregate (or pebbles), sand, an expansion agent (and possibly admixtures). Essentially, it replaces the larger stones in ordinary concrete with very small "fine stones".

[0032] Specific embodiments of this utility model: The project is located in a coastal backfill area. The top elevation of the deep foundation pit is considered based on the design elevation of the outdoor ground level after site leveling, and the bottom elevation of the foundation pit is considered to be up to the bottom elevation of the cushion layer 16. The sealing device is directly positioned at the top of the filter pipe 14 below the dewatering well. The bottom elevation of the sealing device is 0.2m lower than the bottom surface of the cushion layer 16. In this project, 1.4m is taken as the overall height of the sealing device.

[0033] First, determine the well point location, ensuring uniform well point spacing (25m×25m), borehole diameter ≥1200mm, and borehole depth exceeding the bottom elevation of the foundation pit by 6m. After completing the installation of the lower filter pipe 14, align the center of this well pipe 1 with the center of the lower filter pipe 14. Manual assistance can be provided for lowering and positioning. This well pipe 1 serves as a replacement for the traditional upper solid pipe and is tightly connected to the lower filter pipe 14, with a verticality deviation ≤1%. In actual positioning, the two layers of waterstop plates 2 are symmetrically arranged. The distance between the bottom surface of the lower waterstop plate and the bottom surface of the base plate, and the distance between the top surface of the upper waterstop plate and the top surface of the base plate are both controlled within 0.1m. The specific structure is a ring-shaped steel plate. The partition plate 7 is fixed at the bottom elevation of the cushion layer 16. The waterstop plate 2 and the lower hanging plate 4 are pre-welded to the well pipe 1 using manual arc welding. The welding quality is level three welding. The center of the lower filter pipe 14 is consistent with the center of the well pipe 1 to avoid bias pressure. After the well pipe 1 is installed, the formal filter material filling can be carried out. The partition plate 7 and the sealing plate 8 to be installed are used as layers. From bottom to top, high-quality clay, micro-expansion concrete, and micro-expansion fine stone concrete are filled in one layer. After the well is sealed and the water pump parameters are adjusted to meet the requirements, the construction of the next dewatering well point can be carried out.

[0034] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments may also exist. The purpose of the above embodiments is to illustrate the present utility model, rather than to limit the protection scope of the present utility model. All applications derived from simple variations of the present utility model fall within the protection scope of the present utility model.

Claims

1. A sealing device based on a wellpoint dewatering system, comprising a well pipe (1) and a lower filter pipe (14); the lower filter pipe (14) is disposed in the soil (5) below a base plate (6), and is filled with clay (11); the well pipe (1) is disposed in the base plate (6), and the lower end of the well pipe (1) is sleeved on the lower filter pipe (14); characterized in that: The sealing device also includes a partition plate (7), a sealing plate (8), and a micro-expansion concrete layer (10); a lower hanging plate (4) is provided at intervals along the circumference on the lower part of the inner wall of the well pipe (1), and the lower hanging plate (4) is supported on the top of the lower filter pipe (14); a water-stop plate (2) is provided at intervals along the vertical direction on the outer wall of the well pipe (1), located inside the bottom plate (6); the partition plate (7) is located on the top of the lower hanging plate (4) inside the well pipe (1), and the partition plate (7) is connected to the bottom plate (4) of the well pipe (1). The lower hanging plate (4) is connected; an exhaust hole (12) is provided in the middle of the partition plate (7); the micro-expansion concrete layer (10) is filled in the well pipe (1) and located at the top of the partition plate (7), and there is a gap between the top surface of the micro-expansion concrete layer (10) and the top surface of the well pipe (1); the sealing plate (8) is sealed in the well pipe (1) at the top of the micro-expansion concrete layer (10); the top of the sealing plate (8) is filled with a micro-expansion fine stone concrete layer (9).

2. The sealing device based on a wellpoint dewatering system according to claim 1, characterized in that: The bottom of the base plate (6) is provided with a pad (16); the lower hanging plate (4) is provided on the inner wall of the well pipe (1) at the position corresponding to the pad (16).

3. The sealing device based on a wellpoint dewatering system according to claim 1, characterized in that: The lower hanging plate (4) has an inverted L-shaped cross section, and the vertical plate section of the lower hanging plate (4) is welded to the inner wall of the well pipe (1); the bottom of the partition plate (7) is provided with an upper hanging plate (3) at intervals, and the upper hanging plate (3) and the lower hanging plate (4) are arranged at equal intervals; the upper hanging plate (3) has an L-shaped cross section, and the upper hanging plate (3) and the lower hanging plate (4) are hooked together.

4. The plugging device based on a wellpoint dewatering system according to claim 1, characterized in that: The well pipe (1) includes a main pipe section (1.1) and a transition section (1.2); the diameter of the main pipe section (1.1) is larger than the diameter of the lower filter pipe (14); the transition section (1.2) is located at the bottom of the main pipe section (1.1) and is a variable cross-section pipe section; the upper cross-section diameter of the transition section (1.2) is adapted to the diameter of the main pipe section (1.1), and the lower cross-section inner diameter of the transition section (1.2) is adapted to the outer diameter of the lower filter pipe (14); the transition section (1.2) is sleeved on the lower filter pipe (14) and welded to the lower filter pipe (14).

5. The plugging device based on a wellpoint dewatering system according to claim 1, characterized in that: The outer diameter of the waterstop plate (2) is 400mm~450mm, the inner diameter of the waterstop plate (2) is adapted to the outer diameter of the main pipe section (1.1), and the thickness of the waterstop plate (2) is not less than 3mm.

6. The plugging device based on a wellpoint dewatering system according to claim 3, characterized in that: A limit plate (13) is provided on one side of the upper hanging plate (3); an operating handle (17) is provided on the top surface of the partition plate (7).

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