Combined vacuum well point dewatering mechanism

Abstract

The utility model discloses a combined vacuum well-point dewatering mechanism, which is characterized in that an annular rapid drainage auger is arranged on the outer side of the lower part of a well casing, a well wall is arranged on the outer side of the rapid drainage auger, a clay plugging layer is arranged on the upper part of the outer side of the well wall, and a filter material layer is arranged on the lower part of the outer side of the well wall; the height of the rapid drainage auger corresponds to that of the bottom water seepage layer; the height of the filter material layer is from the bottom permeable layer to the soft soil layer; the well casing is connected with a water inlet of the reciprocating vacuum unit through a pipeline, an elbow and a flange; a water outlet pipe of the reciprocating vacuum unit is connected with the drainage ditch. The utility model has the advantages that the arrangement of the rapid drainage auger not only supports the well wall to a certain extent, but also adopts the rapid drainage auger for secondary filtration, so that the density of holes of the well wall can be larger, the radial pressure borne by the well wall during drainage is reduced, and the deformation of the well wall is reduced; and the quick discharge dragon can be hooked out by a long iron hook for replacement, that is, shutdown loss caused by blockage can be well avoided, and the quick discharge dragon is simple to maintain.

Description

Technical Field

[0001] This utility model relates to the field of building technology, specifically a lightweight wellpoint dewatering mechanism. Background Technology

[0002] Lightweight wellpoint dewatering systems are a construction method for dewatering foundation pits. Wellpoint pipes are installed at regular intervals around the perimeter of the foundation pit. A filter pipe is installed at the bottom of each wellpoint pipe and inserted into the permeable layer. A flexible hose connects to a main collection pipe, which is a Φ150 steel pipe with Φ40 suction inlets spaced at the same intervals as the wellpoint pipes. A vacuum pump then extracts water from the collection pipes, thereby lowering the groundwater level around the foundation pit and ensuring the base remains dry. However, existing technology has the following drawbacks: Because the well walls are made of a thin mesh metal material, they are subjected to high radial pressure during pumping, causing the well walls to move closer to the pipe, damaging the well structure and leading to blockages. Repairs are difficult, often requiring the well walls to be removed from the well for replacement. The outer side of the well walls typically has a clay sealing layer and a filter layer; removing the well wall causes these layers to collapse, damaging the internal structure of the well. This not only reduces construction speed but also results in waste. Utility Model Content

[0003] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0004] A combined vacuum wellpoint dewatering mechanism includes an annular rapid drainage duct installed on the lower outer side of the well pipe, a well wall installed on the outer side of the rapid drainage duct, a clay sealing layer installed on the upper part of the outer side of the well wall, and a filter material layer installed on the lower part of the outer side of the well wall; the height of the rapid drainage duct corresponds to the bottom seepage layer; the height of the filter material layer extends from the bottom seepage layer to the soft soil layer.

[0005] The well pipe is connected to the inlet of the reciprocating vacuum unit via pipes, elbows, and flanges; the outlet pipe of the reciprocating vacuum unit is connected to the drainage ditch.

[0006] A geomembrane plug is installed at the bottom of the well pipe.

[0007] The quick-release duct is made of synthetic fibers, plastic wires, and synthetic rubber wound together.

[0008] The height of the speed-draining duct is at least 3 meters.

[0009] Reciprocating vacuum units have exhaust ports.

[0010] The height of the clay sealing layer is 1-1.5 meters.

[0011] The advantages of this invention are: the use of a reciprocating vacuum unit instead of a submersible pump avoids excessive water pressure on the well wall during pumping; the quick-release duct not only provides some support to the well wall, but also, due to the use of the quick-release duct for secondary filtration, the pore density of the well wall can be greater, reducing the radial pressure on the well wall during drainage and reducing deformation of the well wall; and the quick-release duct can be hooked out and replaced with a long iron hook, meaning that the well wall does not need to be pulled out, which can effectively avoid downtime losses caused by blockage, and maintenance is simple. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the cross-section of the quick-drainage duct and the well casing. Detailed Implementation

[0014] The present invention will now be described with reference to the accompanying drawings. As shown in the drawings, multiple lightweight well points are set around the foundation pit. Each lightweight well point has a well foundation 6 at its lower part, a well pipe 1 is set on the well foundation, a geomembrane plug 12 is set at the lower end of the well pipe 1, an annular quick-drainage duct 2 is set on the lower outer side of the well pipe 1, a well wall 3 is set on the outer side of the quick-drainage duct, a clay sealing layer 4 is set on the upper part of the outer side of the well wall, and a filter material layer 5 is set on the lower part of the outer side of the well wall. The filter material is medium and fine sand. The height of the quick-drainage duct 2 corresponds to the bottom seepage layer. The height of the filter material layer extends from the bottom seepage layer to the soft soil layer.

[0015] The well pipe 1 is connected to the inlet of the reciprocating vacuum unit 7 via pipe 8, main pipe connecting steel pipe 81, elbow 82 and flange 83; the outlet pipe 73 of the reciprocating vacuum unit is connected to the drainage ditch 9. The reciprocating vacuum unit is equipped with a liquid level controller 71 and control equipment 72.

[0016] The aforementioned quick-release coil 2 is made of synthetic fibers, plastic threads, and synthetic rubber wound together. These three materials are in the form of threads, which are formed into a whole through winding.

[0017] The height of the speed-draining duct is at least 3 meters.

[0018] The reciprocating vacuum unit has an exhaust port 74.

[0019] The height of the clay sealing layer is 1-1.5 meters.

Claims

1. A combined vacuum wellpoint dewatering mechanism, characterized in that: An annular quick-drainage duct is installed on the lower outer side of the well casing. A well wall is installed on the outer side of the quick-drainage duct. A clay sealing layer is installed on the upper part of the outer side of the well wall, and a filter material layer is installed on the lower part of the outer side of the well wall. The height of the quick-drainage duct corresponds to the bottom seepage layer. The height of the filter material layer extends from the bottom seepage layer to the soft soil layer. The well pipe is connected to the inlet of the reciprocating vacuum unit via pipes, elbows, and flanges; the outlet pipe of the reciprocating vacuum unit is connected to the drainage ditch.

2. The combined vacuum wellpoint dewatering mechanism according to claim 1, characterized in that: A geomembrane plug is installed at the bottom of the well pipe.

3. The combined vacuum wellpoint dewatering mechanism according to claim 1, characterized in that: The quick-release duct is made of synthetic fibers, plastic wires, and synthetic rubber wound together.

4. The combined vacuum wellpoint dewatering mechanism according to claim 1, characterized in that: The height of the speed-draining duct is at least 3 meters.

5. The combined vacuum wellpoint dewatering mechanism according to claim 1, characterized in that: Reciprocating vacuum units have exhaust ports.

6. The combined vacuum wellpoint dewatering mechanism according to claim 1, characterized in that: The height of the clay sealing layer is 1-1.5 meters.

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