CN113338317B - Precipitation well pipe and air pressure circulating type precipitation system - Google Patents
Precipitation well pipe and air pressure circulating type precipitation system Download PDFInfo
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- CN113338317B CN113338317B CN202110568045.9A CN202110568045A CN113338317B CN 113338317 B CN113338317 B CN 113338317B CN 202110568045 A CN202110568045 A CN 202110568045A CN 113338317 B CN113338317 B CN 113338317B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
Abstract
The invention discloses a precipitation well pipe and an air pressure circulating type precipitation system, and relates to the technical field of foundation pit precipitation. The method aims at solving the problems of long dewatering period and poor soil body dewatering effect caused by poor soil layer permeability, high water content, large soil layer thickness and the like in a soft soil area. The precipitation well casing includes well casing main part and sets up in the baffle of its inner chamber along its axial, and the bottom of well casing main part is sealed, radially is equipped with a plurality of through-holes on the pipe wall of well casing main part, and the baffle will well casing main part inner chamber is separated for vacuum zone and compressed air district, and vacuum zone separates the setting with compressed air interval. The air pressure circulating type precipitation system comprises a precipitation well pipe, a vacuumizing device, an air compressing device, a first water pumping device and a second water pumping device, wherein a vacuum area of the precipitation well pipe is respectively communicated with the vacuumizing device and the first water pumping device, and an air pressure area of the precipitation well pipe is respectively communicated with the air compressing device and the second water pumping device.
Description
Technical Field
The invention relates to the technical field of foundation pit dewatering, in particular to a dewatering well pipe and an air pressure circulating type dewatering system.
Background
At present, the existing foundation pit dewatering method generally adopts a well point dewatering mode or a vacuum dewatering mode, the dewatering mode can dewater the water in the foundation soil, promote the soil body to be solidified, improve the foundation strength, and simultaneously can reduce the lateral displacement and settlement of the soil body of the soil slope.
Disclosure of Invention
The method aims at the problems of long dewatering period and poor soil body dewatering effect caused by poor soil layer permeability, high water content, large soil layer thickness and the like in a soft soil area. The invention aims to provide a precipitation well pipe and an air pressure circulating type precipitation system.
The technical scheme adopted by the invention for solving the technical problems is as follows: a precipitation well pipe, characterized in that: it includes well casing main part and sets up in the baffle of its inner chamber along its axial, the bottom of well casing main part is sealed, radially be equipped with a plurality of through-holes on the pipe wall of well casing main part, the baffle will well casing main part inner chamber is separated for vacuum area and compressed air district, just the vacuum area with compressed air district interval sets up.
According to the dewatering well pipe, the inner cavity of the well pipe main body is axially provided with the partition plate, the partition plate divides the inner cavity of the dewatering well pipe into two functional areas which are arranged at intervals, after the dewatering well pipe is installed, the air compressing device is used for forming certain high pressure in the air compressing area, gas is pressed into a soil layer, so that the permeability of a soil body is improved, the flow of water in the soil layer is accelerated, meanwhile, the vacuumizing device is used for forming certain vacuum degree in the vacuum area, water in the soil layer is promoted to flow into the dewatering well pipe through the through holes, the gas is pressed into different functional areas of the single-well structure dewatering well pipe and vacuumized respectively, the permeability characteristic of a low-water-permeability deep soil layer in a soft soil area is effectively improved, the quick dewatering and dewatering of the low-permeability deep soil layer are realized, the uniformity of the soil body around the dewatering well pipe is realized through the conversion of the vacuum area and the air compressing area, and the uneven settlement of the ground is avoided.
Preferably, the cross section of the partition board is in a straight shape or a cross shape, the partition board is fixedly connected to the inner wall of the well pipe main body, and the width of the partition board is matched with the inner diameter of the well pipe main body.
Preferably, the precipitation well pipe is formed by connecting a plurality of well pipe sections end to end, and socket joints are arranged between every two adjacent well pipe sections.
Preferably, the through hole position of the well pipe main body corresponds to the position of the soil water-bearing area.
Preferably, the well casing further comprises a sealing cover plate arranged on the top of the well casing body, and a plurality of mounting holes are formed in the sealing cover plate.
In addition, the invention also provides an air pressure circulating type precipitation system which comprises a precipitation well pipe, a vacuumizing device, an air compression device, a first water pumping device and a second water pumping device, wherein a vacuum area of the precipitation well pipe is respectively communicated with the vacuumizing device and the first water pumping device, and an air compression area of the precipitation well pipe is respectively communicated with the air compression device and the second water pumping device.
The invention relates to an air pressure circulating type precipitation system, wherein a vacuum pumping device enables a vacuum area of a precipitation well pipe to have a certain vacuum degree, a soil body aquifer and an inner cavity of a well pipe main body to have a certain air pressure difference, underground water is enabled to flow into the precipitation well pipe, an air compressing device enables an air compressing area of the precipitation well pipe to have a certain air pressure value, high-pressure air is pressed into a soil body, the effects of expanding soil body pores and improving a soil body hydraulic channel are achieved, the permeability of the soil body is improved, the low-permeability deep soil layer is enabled to be drained quickly, precipitation is enabled to be drained, the vacuum area and the air compressing area are respectively pumped by two water pumping devices, the water pumping quantity of the two water pumping devices is balanced, and the uniform precipitation of the soil body around the precipitation well pipe is enabled to be achieved through the circulating conversion of the vacuum area and the air compressing area, and the uneven settlement of the ground is avoided.
Drawings
FIG. 1 is a schematic view of a precipitation well pipe according to the invention;
FIG. 2 is a cross-sectional view E-E of FIG. 1;
fig. 3 is a schematic view of the pneumatic circulating precipitation system of the present invention.
The numbers in the figures are as follows:
a pneumatic circulating precipitation system 100; a precipitation well pipe 10; a well tubular body 11; a through hole 11-1; a separator 12; a vacuum zone 14; a gas compression zone 15; a sealing cover plate 16; a vacuum-pumping device 30; a compressor unit 20; a first pumping device 41; and a second water pumping device 42.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Example 1
The precipitation well pipe 10 of the present invention is described with reference to fig. 1 and 2, and comprises a well pipe body 11 and a baffle plate 12 arranged in an inner cavity of the well pipe body along an axial direction of the well pipe body, wherein a bottom end of the well pipe body 11 is sealed, a plurality of through holes 11-1 are radially arranged on a pipe wall of the well pipe body 11, the inner cavity of the well pipe body 11 is averagely divided into four regions by the baffle plate 12, namely a region a, a region B, a region C and a region D, wherein the region a and the region D are vacuum regions 14, the region B and the region C are compressed air regions 15, and the vacuum regions 14 and the compressed air regions 15 are arranged at intervals.
According to the precipitation well pipe 10, the inner cavity of the well pipe main body 11 is axially provided with the partition plate 12, the partition plate 12 divides the inner cavity of the precipitation well pipe 10 into two functional areas which are arranged at intervals, namely a vacuum area 14 and an air compression area 15, after the precipitation well pipe 10 is installed, a certain high pressure is formed in the air compression area 15 by the air compression device 20, air is pressed into a soil layer, so that the permeability of a soil body is improved, the flow of water in the soil layer is accelerated, meanwhile, a certain vacuum degree is formed in the vacuum area 14 by the vacuum pumping device 30, water in the soil layer is promoted to flow into the precipitation well pipe 10 from the through hole 11-1, air is respectively pressed into different functional areas of the precipitation well pipe 10 with a single well structure and vacuum pumping is carried out, the permeability characteristic of a low-permeability deep soil layer in a soft soil area is effectively improved, the rapid dewatering precipitation of the low-permeability deep soil layer is realized, and the uniform precipitation of the soil body around the precipitation well pipe 10 is realized through the conversion of the vacuum area 14 and the air compression area 15, so that the uneven settlement of the ground is avoided.
As shown in figure 1, the cross section of the baffle plate 12 is in a straight line shape or a cross shape, the baffle plate 12 is fixedly connected to the inner wall of the well pipe main body 11, the width of the baffle plate 12 is matched with the inner diameter of the well pipe main body 11, the inner cavity of the well pipe main body 11 is divided into two areas by the straight baffle plate 12, and the inner cavity of the well pipe main body 11 is divided into four areas by the cross baffle plate 12.
As shown in fig. 2, the precipitation well pipe 10 is formed by connecting a plurality of well pipe sections end to end, and two adjacent well pipe sections are in socket joint connection, that is, the connection parts of the well pipe main bodies 11 and the partition plates 12 of the two adjacent well pipe sections are in socket joint connection, so that good sealing performance of the precipitation well pipe 10 is ensured.
As shown in FIG. 3, the position of the through hole 11-1 of the well tubular body 11 corresponds to the position of the water-containing region of the soil body, and the through hole 11-1 has both water and air permeable functions.
With continued reference to fig. 3, the downcast well pipe 10 of the present invention further includes a sealing cover plate 16 disposed on the top of the well pipe body 11, and the sealing cover plate 16 is provided with mounting holes for passing the vacuum pumping device 30, the air compressing device 20, the first pumping device 41 and the second pumping device 42, and the sealing cover plate 16 seals the downcast well pipe 10 to improve the efficiency of precipitation.
Example 2
The pneumatic circulating precipitation system 100 of the present invention is described with reference to fig. 1 to 3, and comprises the precipitation well pipe 10, the vacuum pumping device 30, the air compressing device 20, the first pumping device 41, and the second pumping device 42 as described in embodiment 1, wherein the vacuum region 14 of the precipitation well pipe 10 is respectively communicated with the vacuum pumping device 30 and the first pumping device 41, and the air compressing region 15 of the precipitation well pipe 10 is respectively communicated with the air compressing device 20 and the second pumping device 42. The vacuum pumping device 30 enables a vacuum area 14 of the precipitation well pipe 10 to have a certain vacuum degree, a soil aquifer and an inner cavity of the well pipe main body 11 to have a certain air pressure difference, underground water is enabled to flow into the precipitation well pipe 10, the air compressing device 20 enables an air compressing area 15 of the precipitation well pipe 10 to have a certain air pressure value, after high-pressure air is pressed into the soil, the effects of expanding soil pores and improving a soil hydraulic channel are achieved, the permeability of the soil is improved, rapid draining and precipitation of low-permeability deep soil layers are achieved, the two water pumping devices respectively pump water to the vacuum area 14 and the air compressing area 15, water pumping amounts of the two water pumping devices are balanced, and circulating conversion of the vacuum area 14 and the air compressing area 15 is achieved, uniform precipitation of the soil around the precipitation well pipe 10 is achieved, and uneven ground settlement is avoided.
The following describes a monitoring method for a pneumatic circulating precipitation system according to the present invention with reference to fig. 1 to 3, and comprises the following steps:
s1: determining a precipitation scheme according to the size of a foundation pit plane, support arrangement, precipitation depth and the like, reasonably arranging an air pressure circulating type precipitation system 100 according to the precipitation scheme, wherein the air pressure circulating type precipitation system 100 comprises a precipitation well pipe 10, a vacuumizing device 30, an air compressing device 20, a first pumping device 41 and a second pumping device 42, processing and installing the precipitation well pipe 10 according to the precipitation depth and the position of a water-bearing stratum, installing the vacuumizing device 30 and the first pumping device 41 in a vacuum area 14 of the precipitation well pipe 10, installing the air compressing device 20 and the second pumping device 42 in an air compressing area 15 of the precipitation well pipe 10, establishing a foundation pit water-reducing standard model, and calculating the maximum vacuum degree U (U) of the vacuumizing device 30 through the foundation pit water-reducing standard model max Amount of water QU corresponding to time max And maximum pressure P of compressor 20 max Time-corresponding water pumping quantity QP max According to the field water pumping testObtaining the water yield Q of the single well, establishing a relation curve of the water yield Q of the single well and the water level descending depth, and taking the water yield Q of the single well as the monitoring standard of the rainfall;
s2: in the foundation pit precipitation construction process, the actual water pumping amount of the vacuum area 14 and the air compression area 15 is adjusted in real time according to the water pumping amount change value delta Q, so that the actual water pumping amount of the vacuum area 14 and the actual water pumping amount of the air compression area 15 are kept consistent, the water pumping amount change value delta Q = Q- (Q1 + Q2), wherein Q is the water output of a single well, Q1 is the actual water pumping amount of the first water pumping device 41, and Q2 is the actual water pumping amount of the second water pumping device 42.
In summary, a symmetric pumping and compressing mode is adopted, a large-suction vacuum pumping device 30 is used for pumping vacuum in a vacuum area 14 of a precipitation well pipe 10 to form a certain vacuum degree in the vacuum area 14, water in a soil aquifer is promoted to flow into the precipitation well pipe 10, a compressing device 20 is used for compressing air in a compression area 15 of the precipitation well pipe 10 to form a certain pressure in the precipitation well pipe 10, high-pressure gas enters the aquifer through a through hole 11-1 in the pipe wall of the precipitation well pipe 10 to improve the regional permeability of the aquifer, water in the soil aquifer is promoted to flow into the precipitation well pipe 10, and the permeability of the soil is changed by controlling the air pressure value and the vacuum degree of different functional regions in the precipitation well pipe 10, so that balanced precipitation of different functional regions in the soil aquifer is realized; in addition, the uniform precipitation of the soil body around the precipitation well pipe 10 is realized through the cyclic conversion of the vacuum area 14 and the air compression area 15 in the precipitation process, and the uneven settlement of the ground caused by the precipitation is avoided.
The step S1 further includes, before the precipitation construction, installing the sealing cover plate 16 on the top of the precipitation well pipe 10 to seal the precipitation well pipe 10.
In step S2, if Δ Q =0,
when Q1 is greater than Q2, the reaction is carried out,
the water yield DeltaQ is adjusted in the vacuum zone 14 m ＝QU max ÷(QU max +QP max ) X (Q1-Q2) ÷ 2, followed by a maximum degree of vacuum U with an evacuating device max And the corresponding water pumping quantity QU at the maximum vacuum degree max On the basis of the linear change, the vacuum degree in the vacuum area 14 is proportionally adjusted to be smaller until the adjusted and reduced water yield of the vacuum area 14 reaches delta Q m (ii) a Alternatively, the increased water amount DeltaQ is adjusted in the air compression area 15 n ＝QP max ÷(QU max +QP max ) X (Q1-Q2) ÷ 2, followed by a maximum pressure value P of the compressor max And the corresponding water pumping amount QP at the maximum air pressure max On the basis, the air pressure in the pressurized air area 15 is proportionally adjusted according to linear change until the adjusted and increased water yield of the pressurized air area 15 reaches delta Q n ；
When Q1 is less than Q2,
adjusting the increased water yield DeltaQ in the vacuum zone 14 m ＝QU max ÷(QU max +QP max ) X (Q2-Q1) ÷ 2, followed by a maximum degree of vacuum U with an evacuating device max And the corresponding water pumping quantity QU at the maximum vacuum degree max On the basis, the vacuum degree of the vacuum area 14 is adjusted to be larger according to the linear change and equal ratio until the adjusted and increased water yield of the vacuum area 14 reaches delta Q m (ii) a Alternatively, the water output quantity DeltaQ is regulated and reduced in the air compression area 15 n ＝QP max ÷(QU max +QP max ) X (Q2-Q1) ÷ 2, and then, the maximum air pressure value P of the air compressor max And the water pumping amount QP corresponding to the maximum air pressure max On the basis, the air pressure in the air compression area 15 is adjusted to be smaller according to linear change equal ratio until the adjustment water output of the air compression area 15 reaches delta Q n 。
In step S2, if Δ Q > 0,
when Q1 is greater than Q2, the reaction is carried out,
adjusting the water yield DeltaQ in the vacuum zone 14 m ＝QU max ÷(QU max +QP max ) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractor max And the corresponding water pumping quantity QU at the maximum vacuum degree max On the basis of the standard, the vacuum degree of the vacuum area 14 is adjusted to be smaller according to linear change in an equal ratio until the water quantity of the vacuum area 14 is adjusted to reach delta Q m (ii) a Alternatively, the increased water amount DeltaQ is adjusted in the air compression area 15 n ＝QP max ÷(QU max +QP max ) xDeltaQ 2, and then using the maximum pressure value P of air compressor max And the corresponding water pumping amount QP at the maximum air pressure max Based on the standard, the air pressure in the pressurized air area 15 is proportionally adjusted according to linear change until the adjusted and increased water quantity of the pressurized air area 15 reaches delta Q n ；
When Q1 is less than Q2,
adjusting the water yield DeltaQ in the vacuum zone 14 m ＝QU max ÷(QU max +QP max ) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractor max And the corresponding water pumping quantity QU at the maximum vacuum degree max On the basis of the standard, the vacuum degree of the vacuum area 14 is adjusted to be larger according to linear change and equal ratio until the adjusted and increased water quantity of the vacuum area 14 reaches delta Q m (ii) a Or the water yield delta Q is adjusted and reduced in the air compression area 15 n ＝QP max ÷(QU max +QP max ) xDeltaQ 2, and then using the maximum pressure value P of air compressor max And the corresponding water pumping amount QP at the maximum air pressure max On the basis, the air pressure in the air compression area 15 is proportionally adjusted according to linear change until the adjusted water yield of the air compression area 15 reaches delta Q n 。
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (5)
1. The utility model provides a circulating precipitation system of atmospheric pressure which characterized in that: the well casing comprises a well casing body and a partition plate axially arranged in an inner cavity of the well casing body, the bottom end of the well casing body is sealed, a plurality of through holes are radially formed in the pipe wall of the well casing body, the inner cavity of the well casing body is divided into a vacuum area and an air compression area by the partition plate, the vacuum area and the air compression area are arranged at intervals, the vacuum area of the well casing body is respectively communicated with the vacuum pumping device and the first pumping device, and the air compression area of the well casing body is respectively communicated with the air compression device and the second pumping device;
establishing a foundation pit dewatering standard model, and calculating the maximum vacuum degree U of the vacuum extractor through the foundation pit dewatering standard model max Amount of water QU corresponding to time max And maximum pressure P of the compressor max Time-corresponding water pumping quantity QP max Obtaining the water yield Q of a single well according to a field water pumping test,establishing a relation curve of single-well water yield Q and water level descending depth, and adjusting actual water pumping quantities of a vacuum area and a compressed air area in real time according to a water pumping quantity change value in a foundation pit dewatering construction process to enable the actual water pumping quantities of the vacuum area and the compressed air area to be consistent, wherein a water pumping quantity change value delta Q = Q- (Q1 + Q2), Q is the single-well water yield, Q1 is the actual water pumping quantity of a first water pumping device, and Q2 is the actual water pumping quantity of a second water pumping device;
if Δ Q =0, then,
when Q1 is greater than Q2, the reaction is carried out,
adjusting the water yield delta Q in the vacuum area m ＝QU max ÷（QU max + QP max ) X (Q1-Q2) ÷ 2, followed by a maximum vacuum U with vacuum extractor max And the corresponding water pumping quantity QU at the maximum vacuum degree max Based on the standard, the vacuum degree in the vacuum area is adjusted according to linear change in equal proportion until the adjusted water yield of the vacuum area reaches delta Q m (ii) a Or regulating and increasing the water yield delta Q in the air compression area n ＝QP max ÷（QU max + QP max ) X (Q1-Q2) ÷ 2, followed by a maximum pressure value P of the compressor max And the water pumping amount QP corresponding to the maximum air pressure max As a reference, the air pressure in the pressurized air region is adjusted according to linear change in equal proportion until the adjusted and increased water yield of the pressurized air region reaches delta Q n ；
When Q1 is less than Q2,
adjusting the water yield Delta Q in the vacuum zone m ＝QU max ÷（QU max + QP max ) X (Q2-Q1) ÷ 2, followed by a maximum degree of vacuum U with an evacuating device max And the corresponding water pumping quantity QU at the maximum vacuum degree max As a reference, the vacuum degree of the vacuum area is adjusted to be larger according to linear change in equal proportion until the adjusted and increased water yield of the vacuum area reaches delta Q m (ii) a Alternatively, the water output quantity delta Q is regulated in the compressed air region n ＝QP max ÷（QU max + QP max ) X (Q2-Q1) ÷ 2, followed by a compressor maximum pressure value P max And the corresponding water pumping amount QP at the maximum air pressure max On the basis, the air pressure in the air compression zone is adjusted to be smaller according to linear change equal ratio until the water output of the air compression zone is adjusted to be reduced to reach delta Q n 。
2. The air pressure circulating precipitation system of claim 1, wherein: the cross section of the partition board is in a straight shape or a cross shape, the partition board is fixedly connected to the inner wall of the well pipe main body, and the width of the partition board is matched with the inner diameter of the well pipe main body.
3. The air pressure circulating precipitation system of claim 1, wherein: the precipitation well pipe is formed by connecting a plurality of well pipe sections end to end, and socket joint connection is formed between every two adjacent well pipe sections.
4. The air pressure circulating precipitation system of claim 1, wherein: the through hole position of the well pipe main body corresponds to the position of the soil water-bearing area.
5. The air pressure circulating precipitation system of claim 1, wherein: the well casing is characterized by further comprising a sealing cover plate arranged at the top of the well casing main body, and a plurality of mounting holes are formed in the sealing cover plate.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57184118A (en) * | 1981-05-06 | 1982-11-12 | Kentaro Tsuji | Compressed air type deep well device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100823163B1 (en) * | 2006-07-24 | 2008-04-18 | (주)지구환경전문가그룹 | Succion drain apparatus |
| JP5512422B2 (en) * | 2010-07-02 | 2014-06-04 | 五洋建設株式会社 | Decompression unit and vacuum consolidation ground improvement method |
| CN205444215U (en) * | 2015-12-28 | 2016-08-10 | 上海广联环境岩土工程股份有限公司 | Gas drive foundation pit dewatering system |
| CN106049518B (en) * | 2016-07-08 | 2017-11-07 | 廊坊市仁达岩土工程有限公司 | A kind of improved vacuum precipitation system and its control method |
| CN107313421B (en) * | 2017-08-11 | 2019-12-03 | 建基建设集团有限公司 | A kind of rapidly solidified device of barged-in fill and construction method |
| CN210827419U (en) * | 2019-10-09 | 2020-06-23 | 北京铮实环保工程有限公司 | Multi-channel well pipe for air pumping-dewatering of refuse landfill and pretreatment system thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57184118A (en) * | 1981-05-06 | 1982-11-12 | Kentaro Tsuji | Compressed air type deep well device |
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