CN220433711U - Vacuum dewatering well structure - Google Patents

Abstract

A vacuum dewatering well structure relates to the technical field of foundation pit dewatering, and comprises a well pipe, a vacuum pump and a water suction pump, wherein a pipe orifice at the upper end of the well pipe is closed by a well cover; the lower extreme of well pipe is equipped with compound filter tube, and compound filter tube's lower extreme is equipped with the bottom tube, and the bottom tube is wide in the upper end and narrow and the lower extreme confined inverted cone body, and compound filter tube includes interior real pipe, interior filter tube and the outer filter tube of establishing in proper order from interior to outside, and the lower extreme mouth of pipe of interior filter tube interfaces with the upper end mouth of pipe of bottom tube, and the suction pump locates the lumen lower part of interior real pipe, and the upper end mouth of pipe of interior real pipe interfaces with the lower extreme mouth of pipe of well pipe, be equipped with the inner chamber negative pressure pipe in the lumen of well pipe, the inner chamber negative pressure pipe is through the extraction opening that an inner chamber gate valve received the vacuum pump, the well intracavity is equipped with the aqueous vapor, and the aqueous vapor is connected to the extraction opening of vacuum pump through an intermediate chamber gate valve to the aqueous vapor communicating pipe, has seted up the return water interface on the aqueous vapor communicating pipe, is equipped with the return gate valve on the return water interface.

Description

Vacuum dewatering well structure

Technical Field

The utility model relates to the technical field of foundation pit dewatering, in particular to a technology of a vacuum dewatering well structure.

Background

In order to provide a dry and safe construction environment for deep foundation pit engineering, it is necessary to reduce the groundwater level of an excavated soil layer and an aquifer which may cause the sudden gushing of bearing water of a foundation pit bottom plate by adopting a precipitation method. In the deep foundation pit engineering in soft soil areas, the water level or the water content in the aquifer is generally reduced by adopting a pipe well due to the deep excavation depth.

In the pipe well dewatering engineering, for the soil layer with poor permeability, the water yield of the pipe well is generally increased by adopting a vacuum adding mode, and the dewatering effect is improved. When the existing vacuum dewatering well pumps water by adding vacuum, soil layers around the dewatering well are continuously discharged along with groundwater, permeability can be drastically reduced, and dewatering efficiency is affected; in the process of foundation pit excavation, the vacuum degree in the dewatering well can gradually drop, and the vacuum degree is unstable.

Disclosure of Invention

Aiming at the defects in the prior art, the technical problem to be solved by the utility model is to provide a vacuum precipitation well structure which can improve soil permeability and precipitation efficiency and can keep the vacuum degree in the well stable.

In order to solve the technical problems, the vacuum dewatering well structure provided by the utility model comprises a well pipe, a vacuum pump and a water suction pump, wherein a pipe orifice at the upper end of the well pipe is closed by a well cover, and is characterized in that;

the lower end of the well pipe is provided with a composite filter pipe, the lower end of the composite filter pipe is provided with a bottom pipe, the bottom pipe is an inverted frustum-shaped pipe body with a wide upper part and a narrow lower part, the lower end of the bottom pipe is sealed, the pipe wall of the composite filter pipe is watertight, the composite filter pipe comprises an inner solid pipe, an inner filter pipe and an outer filter pipe which are sleeved in sequence from inside to outside, the inner solid pipe is a pipe body with a watertight pipe wall, the inner filter pipe and the outer filter pipe are pipe bodies with a watertight pipe wall, the lower end pipe orifice of the inner filter pipe is in butt joint with the upper end pipe orifice of the bottom pipe, a water pump is arranged at the lower part of the pipe cavity of the inner solid pipe, a water outlet of the water pump is connected with a water drain pipe, the water drain pipe extends upwards out of a well pipe mouth, the upper end pipe orifice of the inner solid pipe is in butt joint with the lower end pipe orifice of the well pipe, an annular space between the inner solid pipe and the inner filter pipe forms a middle cavity of the composite filter pipe, an annular space between the inner solid pipe and the inner filter pipe forms an outer cavity of the composite filter pipe, filter material layer used for filtering particles in underground water is filled in the outer cavity, the inner cavity of the inner cavity is communicated with the inner cavity of the middle cavity of the composite filter pipe, and the upper cavity and the middle cavity is communicated with the sealed cavity;

an inner cavity negative pressure pipe is arranged in the pipe cavity of the well pipe, the inner cavity negative pressure pipe is connected to an extraction opening of the vacuum pump through an inner cavity gate valve, a water-gas communicating pipe is arranged in the middle cavity, the water-gas communicating pipe is connected to the extraction opening of the vacuum pump through a middle cavity gate valve, a water return interface is arranged on the water-gas communicating pipe, and a water return gate valve is arranged on the water return interface;

the periphery of the well pipe and the composite filter pipe is filled with an outer filter material layer for filtering particulates in underground water, and a water stop layer is filled above the outer filter material layer.

According to the vacuum dewatering well structure, as the composite filter tube is formed by sequentially sleeving the inner solid tube, the inner filter tube and the outer filter tube to form the inner cavity, the middle cavity and the filter material layer, the middle cavity and the inner cavity of the filter tube are respectively vacuumized, so that the dewatering efficiency can be accelerated, and the filter material layer is arranged between the outer filter tube and the inner filter tube, so that the attenuation of the permeability of a soil layer can be slowed down, water is injected into the middle cavity to wash the filter material layer, and the permeability of the soil layer can be improved; as the middle cavity and the inner cavity are separated by water when the vacuum pump is used for pumping water, the stability of the vacuum degree in the well can be maintained.

Drawings

FIG. 1 is a schematic diagram of a vacuum dewatering well structure according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a composite filter tube of a vacuum dewatering well structure according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of the wellhead portion of a vacuum dewatering well structure according to an embodiment of the present utility model;

FIG. 4 is a water level burial depth map of a vacuum dewatering well structure according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model is provided in detail, but the embodiments are not limited to the embodiments, and all the similar structures and similar variations using the present utility model should be included in the protection scope of the present utility model, and the reference numerals in the present utility model indicate the relationships.

As shown in fig. 1 and 4, the vacuum dewatering well structure provided by the embodiment of the utility model comprises a well pipe 23, a vacuum pump (not shown) and a water suction pump 31, wherein the upper pipe orifice of the well pipe 23 is closed by a well cover 5;

the lower end of the well pipe is provided with a composite filter pipe 1, the lower end of the composite filter pipe 1 is provided with a bottom pipe 14, the bottom pipe 14 is an inverted frustum-shaped pipe body with a wide upper part and a narrow lower part, the lower end of the bottom pipe 14 is sealed, the pipe wall of the bottom pipe 14 is impermeable, the composite filter pipe 1 comprises an inner solid pipe 121, an inner filter pipe 122 and an outer filter pipe 131 which are sleeved in sequence from inside to outside, the inner solid pipe 121 is a pipe body with a watertight pipe wall, the inner filter pipe 122 and the outer filter pipe 131 are pipe bodies with a watertight pipe wall, the lower end pipe orifice of the inner filter pipe 122 is in butt joint with the upper end pipe orifice of the bottom pipe 14, a water suction pump 31 is arranged at the lower part of a pipe cavity of the inner solid pipe 121, a water discharge pipe 32 is connected to a water outlet of the water discharge pipe 32, the water discharge pipe 32 extends upwards out of a wellhead of the well pipe, the upper end pipe orifice of the inner solid pipe 121 is in butt joint with the lower end pipe orifice of the well pipe 23, the pipe cavity of the inner solid pipe 121 forms an inner cavity 11 of the composite filter pipe, an annular space between the inner solid pipe 121 and the inner filter pipe 122 forms a middle cavity 12 of the composite filter pipe, an annular space between the inner filter pipe 131 and the inner filter pipe 122 forms an annular space 13 of the composite filter cavity 13, the inner cavity 13 between the inner filter pipe 13 and the inner cavity 13 of the inner filter pipe 13 is used for filling the inner cavity 13 and the inner cavity 13 of the inner cavity 13 and the filter material, and the inner cavity 13 is communicated with the inner cavity 13, and the inner cavity 13 is filled with the filter material 13;

an inner cavity negative pressure pipe 43 is arranged in the pipe cavity of the well pipe 23, the inner cavity negative pressure pipe 43 is connected to an extraction opening of the vacuum pump through an inner cavity gate valve 42, a water-gas communicating pipe 15 is arranged in the middle cavity 12, the water-gas communicating pipe 15 is connected to the extraction opening of the vacuum pump through a middle cavity gate valve 44, a water return interface 41 is arranged on the water-gas communicating pipe 15, and a water return gate valve 45 is arranged on the water return interface 41;

the outer circumferences of the well pipe 23 and the composite filter pipe 1 are filled with an outer pipe filter material layer 21 for filtering particulates in underground water, and a water stop layer 22 is filled above the outer pipe filter material layer 21.

The application method of the embodiment of the utility model is as follows:

when the precipitation operation is carried out, the water suction pump 31 is opened, the inner cavity gate valve 42 is opened, the vacuum pump (not shown in the figure) pumps air from the inner cavity 11 through the inner cavity negative pressure pipe 43, so that the inner cavity 11 forms negative pressure, under the action of the negative pressure, underground water enters the middle cavity 12 of the composite filter pipe 1 through the outer filter material layer 21 and the inner filter material layer, then enters the inner cavity 11 from the middle cavity 12 downwards through the lower end pipe orifice of the inner solid pipe 121, and water in the inner cavity 11 is discharged out of the well through the water suction pump 31; when the water outlet of the drain pipe 32 is cut off, the middle cavity gate valve 44 is opened, and air is pumped from the middle cavity 12 through the water-air communicating pipe 15, so that the middle cavity 12 forms negative pressure, and the backflow of underground water is accelerated.

As shown in fig. 4, during vacuum pumping, the relationship between the water level burial depth in each cavity of the composite filter tube and the water level burial depth outside the composite filter tube is as follows: the inner cavity water level embedded depth H1> the middle cavity water level embedded depth H2> the inner filter material layer water level embedded depth H3> the outer filter material layer water level embedded depth H4, and a good hydraulic gradient is formed; because the water level embedded depth in the inner cavity 11 is larger than the water level embedded depth in the middle cavity 12, the inner cavity 11 and the middle cavity 12 are separated by water during vacuum pumping, so that the vacuum degree of the inner cavity 11 is relatively stable.

When the water quantity discharged out of the well is obviously reduced, the inner cavity gate valve 42 and the middle cavity gate valve 44 of the water suction pump 31 are closed to stop pumping water, and the water-gas communicating pipe 15 is connected to a flushing water source, so that flushing water is filled into the middle cavity 12 through the water return gate valve 45 to flush a filter material layer, the soil permeability is improved, the water yield is increased when water is pumped again, and the precipitation efficiency is improved.

Claims (1)

1. The vacuum dewatering well structure comprises a well pipe, a vacuum pump and a water suction pump, wherein a pipe orifice at the upper end of the well pipe is closed by a well cover, and the vacuum dewatering well structure is characterized in that;

the lower end of the well pipe is provided with a composite filter pipe, the lower end of the composite filter pipe is provided with a bottom pipe, the bottom pipe is an inverted frustum-shaped pipe body with a wide upper part and a narrow lower part, the lower end of the bottom pipe is sealed, the pipe wall of the composite filter pipe is watertight, the composite filter pipe comprises an inner solid pipe, an inner filter pipe and an outer filter pipe which are sleeved in sequence from inside to outside, the inner solid pipe is a pipe body with a watertight pipe wall, the inner filter pipe and the outer filter pipe are pipe bodies with a watertight pipe wall, the lower end pipe orifice of the inner filter pipe is in butt joint with the upper end pipe orifice of the bottom pipe, a water pump is arranged at the lower part of the pipe cavity of the inner solid pipe, a water outlet of the water pump is connected with a water drain pipe, the water drain pipe extends upwards out of a well pipe mouth, the upper end pipe orifice of the inner solid pipe is in butt joint with the lower end pipe orifice of the well pipe, an annular space between the inner solid pipe and the inner filter pipe forms a middle cavity of the composite filter pipe, an annular space between the inner solid pipe and the inner filter pipe forms an outer cavity of the composite filter pipe, filter material layer used for filtering particles in underground water is filled in the outer cavity, the inner cavity of the inner cavity is communicated with the inner cavity of the middle cavity of the composite filter pipe, and the upper cavity and the middle cavity is communicated with the sealed cavity;

an inner cavity negative pressure pipe is arranged in the pipe cavity of the well pipe, the inner cavity negative pressure pipe is connected to an extraction opening of the vacuum pump through an inner cavity gate valve, a water-gas communicating pipe is arranged in the middle cavity, the water-gas communicating pipe is connected to the extraction opening of the vacuum pump through a middle cavity gate valve, a water return interface is arranged on the water-gas communicating pipe, and a water return gate valve is arranged on the water return interface;

the periphery of the well pipe and the composite filter pipe is filled with an outer filter material layer for filtering particulates in underground water, and a water stop layer is filled above the outer filter material layer.