CN109944263B - Double-vacuum dewatering system and method - Google Patents
Double-vacuum dewatering system and method Download PDFInfo
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- CN109944263B CN109944263B CN201910222817.6A CN201910222817A CN109944263B CN 109944263 B CN109944263 B CN 109944263B CN 201910222817 A CN201910222817 A CN 201910222817A CN 109944263 B CN109944263 B CN 109944263B
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Abstract
The invention relates to a double-vacuum dewatering and dewatering system and a method, wherein the dewatering system comprises a pumping well, a plurality of radial vacuum pre-pressurized wells distributed in a dewatering area around the pumping well and a first sealing film covering a soil body of the dewatering area; the radial vacuum preloading well comprises a preloading well pipe, a plurality of round holes distributed on the preloading well pipe, second sealing films coated on the side surface and the bottom of the preloading well pipe, and filter materials and filling fine stones which are respectively filled outside and below the side surface of the preloading well pipe; the filter material is connected with a vacuum pump. Compared with the prior art, the invention can accelerate the removal of water in soil when the construction requirements are difficult to be met by adopting a vacuum dewatering well which adopts a well pipe to reduce water or independently adopts the vacuum pumping in the well in a diving area, avoids the condition of cutoff in the water pumping process, reduces the underground water level to be below the construction requirements, makes up the defects of the existing method, and can provide a new water reducing method thought for the fields of engineering geology, geotechnical engineering and foundation pit engineering.
Description
Technical Field
The invention belongs to the technical field of geological engineering, geotechnical engineering and foundation pit engineering, and relates to a double-vacuum dewatering and dewatering system and a method, in particular to a double-vacuum dewatering and dewatering system and a method for utilizing radial vacuum preloading in a hole and vacuum pumping in the hole.
Background
In the construction environment with higher underground water level, well point dewatering is an important technical measure in the construction of earthwork, foundation and foundation engineering, can drain water in foundation soil, promote soil consolidation, improve foundation strength, simultaneously can reduce soil slope soil lateral displacement and settlement, stabilize side slope, eliminate sand running, reduce uplift of foundation soil, avoid the influence of underground water in the construction of foundation and foundation engineering below natural underground water, provide drier construction conditions, reduce earthwork amount, shorten construction period, improve engineering quality and ensure construction safety. However, in a diving area (the soil is mostly silt or soft clay), the permeability coefficient of the soil is very small, the effect of lowering the underground water level by using well point precipitation is not ideal, and the research on how to improve the precipitation efficiency and the like in a soft clay area is urgently needed at present.
Disclosure of Invention
The present invention aims to overcome the above-mentioned drawbacks of the prior art and to provide a dual vacuum dewatering system and method.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a double-vacuum dewatering and dewatering system which comprises a pumping well, a plurality of radial vacuum pre-pressing wells distributed in a dewatering area around the pumping well and a first sealing film covering a soil body of the dewatering area; the radial vacuum preloading well comprises a preloading well pipe, a plurality of round holes distributed on the preloading well pipe, second sealing films coated on the side surface and the bottom of the preloading well pipe, and filter materials and filling fine stones which are respectively filled outside and below the side surface of the preloading well pipe; the filter material is connected with a vacuum pump.
Preferably, the plurality of radial vacuum pre-pressurized wells are distributed in a quincunx shape in the dewatering area around the pumping well.
Preferably, the pre-pressing well pipe is a PVC pipe, and the round holes are distributed on the pre-pressing well pipe in a quincunx shape.
Preferably, the vacuum pump is connected with the filter material through a vacuum pump pipe, the vacuum pump pipe is inserted into the filter material, and the contact position of the vacuum pump pipe and the filter material is separated through a filter screen. The filter material is prevented from being sucked in the vacuum pumping process.
Preferably, the first sealing film comprises a multi-layer sealing film body and non-woven geotextiles positioned on the upper surface and the lower surface of the multi-layer sealing film body. The number of layers of the multilayer sealing film body in the first sealing film is preferably 2 to 3.
Preferably, the second sealing membrane is tightly attached to the prepressing well pipe, the sealing membrane body and the non-woven geotextile by sequentially arranging a plurality of layers of sealing membrane bodies from inside to outside and sleeving the sealing membrane bodies to protect the sealing membrane bodies. Guarantee no air between second seal membrane and the PVC pipe, when the evacuation like this, the outside air just can see through the round hole and extrude the second seal membrane better to extrude the soil body, transmit radial pressure. Preferably, 2-3 layers of sealing film bodies are arranged in the second sealing film.
Preferably, the sealing film body is made of a special geomembrane made of polyvinyl chloride and having good sealing performance, good toughness, strong penetration resistance and strong ageing resistance.
Preferably, the diameter of the prepressing well pipe is 200mm, the diameter of the well hole is 300mm, the filter material is filled between the well pipe and the wall of the well hole, the height of the fine stone is 200mm, the diameter of the circular hole is 10mm, and the distance between the circular holes is 200 mm.
Preferably, the opening of the pre-pressing well pipe is exposed out of the ground, and a second sealing membrane is tied on the pre-pressing well pipe by a rubber hoop at the part of the pre-pressing well pipe exposed out of the ground. To ensure the tightness. Preferably, the ground exposure length of the pre-pressed well pipe is 200mm, and the buried depth of the bottom of the well pipe is designed according to the precipitation requirement and the related precipitation engineering technical specification.
Preferably, the pumping well is a vacuum dredging well for pumping water in the well in vacuum. The ground exposure length of the well pipe is further preferably 200mm, and the buried depth of the bottom of the well pipe is designed according to the precipitation requirement and the related precipitation engineering technical specification.
The invention also provides a dewatering method adopting the double-vacuum dewatering system, which comprises the following steps:
s1: a plurality of radial vacuum pre-kill wells are distributed in a dewatering area around the pumping well;
s2: covering a first sealing film on the soil body of the precipitation area;
s3: when the pumping well pumps water, the vacuum pump is used for vacuumizing until precipitation is finished, so that a soil body between the radial vacuum pre-pressing well and the pumping well is in a vacuum state, the second sealing film bears a load equal to the pressure difference between the inside and the outside of the sealing film, radial super-pore pressure is applied to the soil body, moisture in the soil is removed in an accelerated mode, and the phenomenon of cutoff in the pumping process is avoided.
Preferably, the first sealing membrane is also subjected to a load equal to the pressure difference between the inside and the outside of the membrane. The first sealing membrane and the second sealing membrane respectively vertically and radially extrude a soil body, and the soil generates super pore pressure to promote the discharge of pore water.
Compared with the prior art, the invention can accelerate the removal of water in soil when the construction requirements are difficult to be met in a diving area (soil quality is mostly silt or soft clay), a vacuum dewatering well adopting well pipes for dewatering or independently adopting vacuum pumping in the well, avoids the condition of flow breaking in the water pumping process, reduces the underground water level to be below the construction requirements, makes up the defects of the existing method, and can provide a new dewatering method thought for the fields of engineering geology, geotechnical engineering and foundation pit engineering.
Drawings
FIG. 1 is a schematic view of a radial vacuum pre-kill well of the present invention;
fig. 2 is a schematic plan layout view of a pumping well and a radial sugarcane grower pre-kill well in the invention.
In the figure, 1 is a pre-pressing well pipe, 2 is a round hole, 3 is a filter material, 4 is a filling fine stone, 5 is a sealing film body, 6 is a non-woven geotextile, 7 is a rubber hoop, 8 is a vacuum pump, 9 is a filter screen, 10 is a pumping well, and 11 is a radial vacuum pre-pressing well.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A double-vacuum dewatering and dewatering system is shown in figures 1-2 and comprises a pumping well 10, a plurality of radial vacuum pre-pressing wells 11 distributed in a dewatering area around the pumping well 10 and a first sealing film covering a soil body of the dewatering area; the radial vacuum pre-pressurized well 11 comprises a pre-pressurized well pipe 1, a plurality of round holes 2 distributed on the pre-pressurized well pipe 1, second sealing films coated on the side surface and the bottom of the pre-pressurized well pipe 1, and filter materials 3 and fine filling stones 4 respectively filled outside and below the side surface of the pre-pressurized well pipe 1; the filter material 3 is connected with a vacuum pump 8.
In this embodiment, six radial vacuum pre-kill wells 11 are distributed in the dewatering area around the pumping well 10, and the six radial vacuum pre-kill wells 11 are distributed in the dewatering area around the pumping well 10 in a quincunx shape.
In the embodiment, the pumping well 10 adopts a vacuum dredging well which adopts the vacuum pumping in the well which is started to be used in engineering. The length of the ground exposure of the well pipe is 200mm, and the buried depth of the bottom of the well pipe is designed according to the precipitation requirement and the related precipitation engineering technical specification.
In this embodiment, the first sealing membrane includes a multi-layer sealing membrane body 5 and non-woven geotextiles 6 on both upper and lower surfaces of the multi-layer sealing membrane body. The number of layers of the multilayer sealing film body in the first sealing film is preferably 2 to 3.
As shown in fig. 1, the pre-pressed well casing 1 of the radial vacuum pre-pressed well 11 is a PVC pipe, the diameter is 200mm, the diameter of the well hole is 300mm, the filter material 3 is filled between the well casing and the wall of the well hole, the round holes 2 are distributed on the pre-pressed well casing 1 in a quincunx shape, the diameter of the round holes is 10mm, the distance between the round holes is 200mm, the vacuum pump 8 is connected with the filter material 3 through the vacuum pump pipe, the vacuum pump pipe is inserted in the filter material 3, and the contact part of the vacuum pump pipe and the filter material is separated by the. The height of the filling fine stone 4 is 200 mm. The length of the ground exposure of the well pipe is 200mm, and the buried depth of the bottom of the well pipe is designed according to the precipitation requirement and the related precipitation engineering technical specification. The second sealing membrane is tightly attached to the prepressing well pipe 1, the sealing membrane body 5 and the non-woven geotextile 6, wherein the sealing membrane body 5 is sequentially arranged from inside to outside, and the non-woven geotextile 6 is sleeved outside the sealing membrane body 5 and used for protecting the sealing membrane body 5. In this embodiment, it is preferable that 2 to 3 layers of the sealing film main body are provided in the second sealing film. The opening of the pre-pressed well pipe 1 is exposed to the ground, and a second sealing film is tied on the pre-pressed well pipe 1 by a rubber hoop 7 at the part of the pre-pressed well pipe 1 exposed to the ground.
The dewatering method adopting the double-vacuum dewatering system comprises the following steps:
s1: six radial vacuum pre-kill wells 11 are distributed in a dewatering area (around the pumping well 1);
s2: covering a first sealing film on the soil body of the precipitation area;
s3: when the pumping well 10 pumps water, the vacuum pump 8 is used for vacuumizing until precipitation is completed, soil between the radial vacuum pre-pressing well 11 and the pumping well 10 is in a vacuum state, the second sealing film bears a load equal to the pressure difference between the inside and the outside of the sealing film, radial super-pore pressure is applied to the soil, the formed super-pore pressure promotes the hydraulic gradient between the pre-pressing hole and the vacuum pipe well, the flow of underground water is accelerated, then the water is pumped out from the vacuum dredging well, the moisture in the soil is removed in an accelerated mode, and the phenomenon that water is cut off in the pumping process is avoided.
In this embodiment, the first sealing membrane is also subjected to a load equal to the pressure differential between the inside and outside of the membrane. The first sealing membrane and the second sealing membrane respectively vertically and radially extrude a soil body, and the soil generates super pore pressure to promote the discharge of pore water.
The radial vacuum pre-kill well 11 is arranged by adopting the following method: the method comprises the steps of filling filter materials 3 outside a PVC pipe of a radial vacuum pre-pressurized well 11, arranging fine filling stones 4 at the lower part of the PVC pipe, sleeving 2-3 layers of sealing film bodies 5 outside the PVC pipe, sleeving non-woven geotextile 6 outside the sealing film bodies 5 to protect the sealing film bodies 5 (the sealing film bodies 5, the non-woven geotextile 6 and the PVC pipe are required to be tightly attached and have no air bubbles), and finally fastening the sealing film bodies 5 and the non-woven geotextile 6 on the PVC pipe by rubber band hoops 7 at the part of the well pipe exposed out of the ground to ensure the tightness of the sealing film bodies and connecting a vacuum pump between the filling filter materials.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. A double-vacuum dewatering system is characterized in that,
the device comprises a pumping well (10), a plurality of radial vacuum pre-pressurized wells (11) distributed in a dewatering area around the pumping well (10) and a first sealing film covering the soil body of the dewatering area;
the radial vacuum pre-kill well (11) comprises a pre-compaction well pipe (1), a plurality of round holes (2) distributed on the pre-compaction well pipe (1), second sealing films coated on the side surface and the bottom of the pre-compaction well pipe (1), and filter materials (3) and fine stones (4) which are respectively filled outside and below the side surface of the pre-compaction well pipe (1); the filter material (3) is connected with a vacuum pump (8).
2. A double vacuum dewatering and precipitation system according to claim 1, characterized in that a plurality of radial vacuum pre-kill wells (11) are distributed in a quincunx around the dewatering area of the pumping well (10).
3. The double-vacuum dewatering and dewatering system according to claim 1, wherein the pre-pressing well pipe (1) is a PVC pipe, and the circular holes (2) are distributed on the pre-pressing well pipe (1) in a quincunx shape.
4. A double vacuum dewatering and precipitation system according to claim 1, wherein the first sealing membrane comprises a multi-layer sealing membrane body (5) and non-woven geotextiles (6) on both upper and lower surfaces of the multi-layer sealing membrane body.
5. The double-vacuum dewatering and dewatering system according to claim 1, wherein the second sealing membrane is formed by a plurality of layers of sealing membrane bodies (5) which are sequentially arranged from inside to outside and non-woven geotextiles (6) which are sleeved on the sealing membrane bodies (5) and are used for protecting the sealing membrane bodies (5), and the pre-pressing well pipe (1), the sealing membrane bodies (5) and the non-woven geotextiles (6) are tightly attached to each other.
6. A double vacuum dewatering and precipitation system according to claim 1 or 5, characterized in that the mouth of the pre-pressing well pipe (1) is exposed to the ground, and a second sealing membrane is tied on the pre-pressing well pipe (1) by a rubber hoop (7) at the part of the pre-pressing well pipe (1) exposed to the ground.
7. A dual vacuum dewatering system according to claim 1, wherein the pumping well (10) is a vacuum dewatering well in which the well is pumped by vacuum.
8. A precipitation method adopting the double-vacuum dewatering and precipitation system as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
s1: a plurality of radial vacuum pre-killing wells (11) are distributed in a water descending area around the pumping well (10);
s2: covering a first sealing film on the soil body of the precipitation area;
s3: when the pumping well (10) pumps water, the vacuum pump (8) is used for vacuumizing until precipitation is finished, soil between the radial vacuum pre-pressing well (11) and the pumping well (10) is in a vacuum state, the second sealing film bears a load equal to the pressure difference between the inside and the outside of the sealing film, and radial super-pore pressure is applied to the soil for accelerating the removal of water in the soil and avoiding the occurrence of flow break in the pumping process.
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| JP3009968B2 (en) * | 1992-04-27 | 2000-02-14 | 前田建設工業株式会社 | Backfill method of the back of the existing building |
| CN1228494A (en) * | 1998-03-06 | 1999-09-15 | 张凌 | Vacuum deep well reinforcing method for large thickness soft soil foundation |
| KR100729567B1 (en) * | 2006-07-26 | 2007-06-18 | 주식회사 대한아이엠 | Method of construction for promoting drain by vacuum and pressure, and drain pipe there of |
| JP6066276B2 (en) * | 2012-06-08 | 2017-01-25 | 株式会社大林組 | Method and system for preventing liquefaction |
| CN104947701B (en) * | 2015-07-07 | 2017-04-26 | 冯克俊 | Ground pit rainfall combination deep well device |
| CN105839655B (en) * | 2016-05-12 | 2017-12-26 | 同济大学 | The cleaning base pit dewatering system that a kind of base pit dewatering couples with contaminated site regulation |
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