CN106958240B - Air cushion type layered vacuum pipe well and soft foundation drainage method using same - Google Patents
Air cushion type layered vacuum pipe well and soft foundation drainage method using same Download PDFInfo
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- CN106958240B CN106958240B CN201710243934.1A CN201710243934A CN106958240B CN 106958240 B CN106958240 B CN 106958240B CN 201710243934 A CN201710243934 A CN 201710243934A CN 106958240 B CN106958240 B CN 106958240B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention relates to an air cushion type layered vacuum pipe well which comprises a pipe well, wherein an air cushion type vacuum pipe well layered dewatering device is arranged in the middle of the pipe well and comprises an inner ring cover plate and air cushion rings made of rubber, four sliding ways which are arranged in a crisscross manner are arranged on the inner ring cover plate, each sliding way is provided with a sliding plate, a vacuum pump connecting pipe hole is upwards connected with a vacuum generating pipe, a vacuum gauge pipe is upwards connected with a cable wire and a hanging pump rope hole, a drainage pipe hole is downwards connected with a drainage connecting pipe, the drainage pipe hole is upwards connected with a drainage pipe, drain pipes are downwards arranged at two sides of the inner ring cover plate, and the air cushion rings are arranged below the inner ring cover plate. The air cushion type layered vacuum pipe well and the soft foundation dewatering and draining method using the same can carry out different dewatering construction on different soil textures, and can achieve the dual functions of pipe well dewatering and vacuum dewatering.
Description
Technical Field
The invention relates to an air cushion type layered vacuum pipe well and a soft foundation drainage method using the same. The method is used for quickly reducing the groundwater level of the soft soil foundation, can reduce the construction cost, reduce the labor intensity and improve the construction efficiency. Belongs to the technical field of foundation treatment.
Background
At present, large-area soft soil foundation reinforcement treatment and foundation pit excavation in the construction industry all relate to reducing the groundwater level so as to meet the requirement of reducing the water content of soil. The method for lowering the underground water level of the soil body is generally realized by adopting a well-point dewatering method and a pipe-well dewatering method, in the two processes, the pipe-well dewatering can reach below 20m due to the depth of the pipe-well dewatering inserted into the soil body, and can reach below 10m by means of the principle of hydraulic weight release, thereby creating conditions for deep dewatering of the soft soil foundation, and therefore, the pipe-well dewatering method is widely applied to reinforcing treatment of the soft soil foundation.
However, in the construction process, the permeability coefficient is higher than the requirement on the pipe well dewatering, namely, the pipe well dewatering is generally suitable for soil layers with the permeability coefficient of 20-200 m/d, and the pipe well dewatering is inapplicable to muddy soil with smaller permeability coefficient. According to the difficulty, in order to fully exert the advantages and advantages of the pipe well dewatering, vacuum pipe well dewatering is generated, namely, the pipe well mouth is closed, and a vacuum pump is connected to the pipe well mouth to perform vacuum dewatering. However, in the depth range to be reinforced, the soil properties are different, and the soil permeability coefficients are different. When the vacuum pipe well is subjected to vacuum dewatering, most of vacuum negative pressure is dissipated in a soil layer with good soil property, and the vacuum pressure of the vacuum pipe well is basically not measured when the vacuum pressure of the vacuum pipe well is actually measured. The main reason is that most or all of the vacuum pressure is lost in the soil layer with better permeability coefficient, and the vacuum negative pressure is not obtained by the mucky soil in the sludge layer requiring the vacuum negative pressure. Or no vacuum at all. Therefore, the effect of vacuum tube well precipitation on the silt layer is not ideal.
Disclosure of Invention
The invention aims to overcome the defects and provide the air cushion type layered vacuum pipe well which can carry out different dewatering construction on different soil properties and can achieve the double functions of pipe well dewatering and vacuum dewatering and the soft foundation dewatering and drainage method using the same.
The purpose of the invention is realized in the following way:
the utility model provides an air cushion type layering vacuum pipe well, it includes the pipe well, the middle part of pipe well is provided with air cushion type vacuum pipe well layering precipitation unit, and air cushion type vacuum pipe well layering precipitation unit includes inner circle apron and rubber material's air cushion circle, be provided with four slides that the cross was arranged on the inner circle apron, all be provided with a slide on every slide, set up vacuum pump connect tube hole, vacuum meter connect tube hole, cable conductor and hanging pump rope hole and drainage tube hole on the inner circle apron, wherein vacuum pump connect tube upward connection vacuum gauge tube, cable conductor and hanging pump rope hole upward connection cable conductor and hanging pump rope pipe, drainage tube hole downward connection drainage connecting tube, drainage tube upward connection drain pipe is provided with down in inner circle apron both sides, the air cushion circle sets up in the inner circle apron below, the air cushion circle external diameter is slightly greater than the internal diameter of pipe well.
The soft foundation drainage method using the air cushion type layered vacuum tube well comprises the following steps:
step one, assembling an air cushion type layered vacuum tube well
Step two, pipe well construction:
3.1, constructing a pipe drilling well according to a common construction standard;
3.2, putting the submersible pump into the well after the well is drilled according to the standard requirement, performing test operation, and entering the next step under the condition that the well is normal in operation;
step three, layered vacuum precipitation
Determining layering positions: determining the soil layer position with poor permeability coefficient according to the geological survey data or according to the construction experience of the well construction process, putting an air cushion ring into the well, and inflating the air cushion ring after the air cushion ring reaches the determined position in the pipe well to ensure that the air cushion ring is clamped at the required position;
and (5) putting an inner ring cover plate: after all the pipelines are firmly connected, the inner ring cover plate is put into the air gasket and covered on the air gasket, when the inner ring cover plate is covered on the air gasket, the sliding block on the inner ring cover plate is opened, the sliding block is blocked and opened outside and clamped on the wall of the pipe well, and after the inner ring cover plate is installed, the inner ring cover plate is connected with the vacuum pump to vacuumize.
And (3) group well construction: when large-area precipitation construction is performed, a plurality of tube wells are necessary to form group well construction, at this time, according to design requirements, under the condition that the precipitation of the tube wells is completed, soil conditions with different layer thicknesses in the precipitation range of different tube wells are subjected to layered vacuumizing by adopting air cushion type layered vacuum tube wells, under the condition, the number of vacuum pumps used is determined according to the power of the vacuum pumps, and each vacuum pump is connected with each air cushion type layered vacuum tube well through a main pipe.
For air cushion type layered vacuum pipe well multilayer precipitation: in the actual construction process, if multiple layers of soil layers with permeability coefficients smaller than 20m/d are encountered, multiple layers of air cushion seals are determined to be arranged according to the permeability coefficients for vacuum precipitation, the method is set from bottom to top, corresponding pipelines are connected to the positions where the air cushion layers are required according to the steps 3.1 and 3.2, vacuumizing is carried out after the air cushion seals are arranged, and vacuum precipitation is carried out on the soil layers with small permeability coefficients at different depths.
Compared with the prior art, the invention has the beneficial effects that:
1. simple implementation and wide application range
Utilize traditional downcomer well to the relatively poor soil horizon of osmotic coefficient, through setting up the air cushion layering in the tube well, form a dual-purpose function of pipe, both utilize gravity precipitation and utilize the vacuum to draw water, make the precipitation area through different precipitation modes, reach soil body moisture content even, satisfy weak soil drainage needs that drop. The vacuum negative pressure generation range of the air cushion layering can be set arbitrarily according to different layers of soil, so that the application range of pipe well dewatering is enlarged, and the dewatering effect of different layers and different soil is ensured.
2. Short construction time, high speed and low cost
Compared with the traditional pipe well, the pipe well dewatering method enlarges the applicability of pipe well dewatering to soil, the traditional pipe well dewatering is suitable for soil with the permeability coefficient of 20-200 m/d, and is ineffective for soil with the permeability coefficient of less than 20m/d, particularly mucky soil, mainly because the pipe well dewatering is released by gravity. By adopting the air cushion type layered pipe well, the soil with the permeability coefficient smaller than 20m/d is subjected to vacuum precipitation, and vacuum negative pressure is concentrated on the soil with the permeability coefficient smaller than 20m/d through layering, so that the effect of pipe well precipitation is obvious, and the gravity water release and precipitation speed is higher.
Compared with a vacuum pipe well, the invention has the advantages that as the vacuum pipe well is generally used for the soil with the permeability coefficient smaller than 20m/d, the soil is different in the required deep-falling range, and when the local permeability coefficient is larger, a large amount of vacuum negative pressure can leak, so that the vacuum pipe well has no vacuum situation, and the existing vacuum pipe well has no effect. The invention adopts gravity water release (i.e. pipe well dewatering) to the soil with permeability coefficient more than 20m/d and adopts layering isolation to the soil with permeability coefficient less than 20m/d to carry out vacuum negative pressure dewatering. Therefore, the vacuum tube well dewatering is only used for the soil layer with small permeability coefficient, the dewatering time is shortened, and the dewatering quality is improved.
3. Environmental protection and no pollution, and civilization of construction site
The air cushion type layered pipe well dewatering device is designed to be a reusable device, and can be inflated when in use, and can be recovered after being deflated when not in use, thereby creating conditions for civilized construction.
4. Deep precipitation, high efficiency
The layered dewatering device for the air cushion type vacuum tube well can be adjusted randomly according to the soil penetration depth of the tube well, is not limited, particularly in large-area dewatering construction, can set different soil layers where group wells are located according to different wells, and can perform different setting on different soil penetration depths of each well, particularly perform reinforcing treatment on interlayer soil, and the dewatering effect is more obvious. The vacuum negative pressure can be displayed through a vacuum gauge arranged on the layered cover plate, so that supervision and management of the construction process are facilitated. Therefore, the method not only can be used for civil engineering, but also can be used for reinforcement treatment of roads, sites, underground pipelines and the like.
The air cushion type layered vacuum pipe well and the construction method thereof have simple steps, achieve dual purposes of one well by adopting different precipitation methods for different soil layers, not only can meet the precipitation effect of different soil layers, but also can carry out multi-layer vacuum precipitation on complex strata. Therefore, the method is suitable for construction of dewatering and drainage of different soil, solves the problem that the dewatering of the existing pipe well and the dewatering of the vacuum pipe well cannot exceed the obstacle, and lays a foundation for lowering the groundwater level and lowering the water content of soil.
Drawings
FIG. 1 is a schematic diagram of the structure of an air cushion type layered vacuum tube well according to the present invention.
Fig. 2 is a schematic view of an inner ring cover plate.
Fig. 3 is a schematic view of a gas gasket.
Wherein:
the vacuum generating pipe 1, the vacuum gauge pipe 2, the cable and hanging pump rope pipe 3, the drain pipe 4, the pipe well 5, the inner ring cover plate 6, the vacuum pump connecting pipe hole 6.1, the cable and hanging pump rope hole 6.2, the drain pipe hole 6.3, the slideway 6.4, the sliding plate 6.5, the air cushion ring 7, the air charging door 7.1, the drain pipe 8, the drain connecting pipe 9 and the submersible pump 10.
Detailed Description
Referring to fig. 1-3, the air cushion type layered vacuum tube well comprises a tube well 5, wherein an air cushion type vacuum tube well layered dewatering device is arranged in the middle of the tube well 5, the air cushion type vacuum tube well layered dewatering device comprises an inner ring cover plate 6 and an air cushion ring 7 made of rubber, four sliding ways 6.4 which are arranged in a crisscross manner are arranged on the inner ring cover plate 6, a sliding plate 6.5 is arranged on each sliding way 6.4, and when the air cushion type layered vacuum tube well is used, the sliding plate is only required to be opened by a person through the sliding way and is propped against the inner ring of the tube well, and the main function of the air cushion type layered vacuum tube well is to support the wall of the inner ring cover plate.
The inner ring cover plate 6 is provided with a vacuum pump connecting pipe hole 6.1, a vacuum meter connecting pipe hole (no reference sign in the figure), a cable wire and hanging pump rope hole 6.2 and a drainage pipe hole 6.3, wherein the vacuum pump connecting pipe hole 6.1 is upwards connected with the vacuum generating pipe 1, the vacuum meter connecting pipe hole is upwards connected with the vacuum meter pipe 2, the cable wire and hanging pump rope hole 6.2 is upwards connected with the cable wire and hanging pump rope pipe 3, and the drainage pipe hole 6.3 is downwards connected with the drainage connecting pipe 9; the submerged pump 10 is positioned at the bottom of the pipe well 5, the drain pipe hole 6.3 is upwards connected with the drain pipe 4, and drain pipes 8 are downwards arranged at two sides of the inner ring cover plate 6, so that the submerged pump mainly has the effect that when the air cushion type vacuum pipe well layered dewatering device is arranged at the middle part, the underground water in the pipe well is converged in the upper soil body and flows into the lower pipe well through the pipeline, the length of the drain pipe 8 is determined according to the position of the submerged pump, and the submerged pump is submerged without being influenced by vacuumizing (namely, a water sealing mode is adopted).
The inner ring cover plate 6 is connected with the vacuum generating pipe 1, the vacuum gauge pipe 2, the cable and the hanging pump rope pipe 3 and the drain pipe 4; the pipe materials with the same pipe diameter can be uniformly manufactured, so that the construction is unnecessary to be recognized and mutually used.
The air cushion ring 7 is made of rubber. The shape is like the swim ring used daily, the air cushion ring 7 is arranged below the inner ring cover plate 6, the outer diameter of the air cushion ring 7 is slightly larger than the inner diameter of the pipe well 5, and when the pipe well is vacuumized, the inner ring cover plate 6 is tightly combined with the air cushion ring 7 to prevent air leakage. And can be clamped on the wall of the pipe well 5 by using the air gasket 7. The inner diameter of the air washer 7 may be determined according to the inner ring cover plate 6 and may be generally 150mm. The air cushion ring is provided with the air inflation valve 7.1, and the air cushion ring has the functions of layering the pipe well, so that the length of the air inflation valve 7.1 is determined according to the depth of the air cushion ring entering the pipe well, and a sealing layer is formed between the air cushion ring and the inner ring cover plate after the air cushion ring is inflated.
The soft foundation drainage method using the air cushion type layered vacuum tube well comprises the following steps:
step one, assembling an air cushion type layered vacuum tube well
Step two, pipe well construction:
2.1, constructing a pipe drilling well according to a common construction standard;
2.2, putting the submersible pump into the well after the well is drilled according to the standard requirement, performing test operation, and entering the next step under the condition that the well is normal in operation;
step three, layered vacuum precipitation
3.1, determining layering positions: determining the soil layer position with poor permeability coefficient according to the geological survey data or according to the construction experience in the well construction process, putting an air cushion ring into the well, and inflating the air cushion ring after the air cushion ring reaches the determined position in the pipe well to ensure that the air cushion ring is clamped at the required position; then the submerged pump and the submerged pump cable line at the lower part of the pipe well penetrate through the air gasket and are connected with the corresponding cable line and the suspended pump rope pipe 3 on the inner ring cover plate, the inner ring cover plate is connected with the vacuum generating pipe 1, and the pipelines connected with the inner ring cover plate are fastened by iron wires so as to prevent reworking caused by falling of the pipelines.
3.2, putting an inner ring cover plate: after all the pipelines are firmly connected, the inner ring cover plate is put into the air gasket and covered on the air gasket, and as the air gasket is provided with the inner ring and the outer ring, after the inner ring cover plate is covered on the air gasket, the sliding block on the inner ring cover plate is opened, the outer baffle is opened and clamped on the wall of the pipe well, and the vacuum pump can be connected after the inner ring cover plate is installed, and vacuum pumping is performed.
3.3, group well construction: when large-area precipitation construction is performed, a plurality of tube wells are necessary to form group well construction, at this time, under the condition of completing precipitation of the tube wells according to design requirements, soil conditions with different layer thicknesses in precipitation ranges of different tube wells can be subjected to layered vacuumizing by adopting air cushion type layered vacuum tube wells, under the condition, the number of vacuum pumps used is determined according to the power of the vacuum pumps, and each vacuum pump is connected with each air cushion type layered vacuum tube well through a main pipe. In the vacuumizing process, the readings of the vacuum meters of all the wells are paid attention to, so that the vacuum negative pressure is ensured to meet the drainage requirement.
3.4, multilayer precipitation of the air cushion type layered vacuum tube well: in the actual construction process, if multiple layers of soil layers with permeability coefficients smaller than 20m/d are encountered, multiple layers of air cushion seals can be determined to be arranged according to the permeability coefficients for vacuum precipitation, the method can be set from bottom to top, corresponding pipelines are connected to the positions of the needed air cushion layers according to the steps 3.1 and 3.2, vacuumizing is carried out after the air cushion seals are arranged, and vacuum precipitation is carried out on the soil layers with small permeability coefficients at different depths.
Claims (4)
1. The utility model provides an air cushion type layering vacuum tube well, it includes tube well (5), its characterized in that: the middle part of the pipe well (5) is provided with an air cushion type vacuum pipe well layered dewatering device, the air cushion type vacuum pipe well layered dewatering device comprises an inner ring cover plate (6) and an air cushion ring (7) made of rubber, the inner ring cover plate (6) is provided with a vacuum pump connecting pipe hole (6.1), a vacuum meter connecting pipe hole, a cable line, a hanging pump rope hole (6.2) and a drainage pipe hole (6.3), the vacuum pump connecting pipe hole (6.1) is upwards connected with a vacuum generating pipe (1), the vacuum meter connecting pipe hole is upwards connected with a vacuum meter pipe (2), the cable line and the hanging pump rope hole (6.2) are upwards connected with the cable line and the hanging pump rope pipe (3), the drainage pipe hole (6.3) is downwards connected with a drainage pipe (9), two sides of the inner ring cover plate (6) are downwards provided with drainage pipes (8), the air cushion ring (7) is arranged below the inner ring cover plate (6), and the outer diameter of the air cushion ring (7) is slightly larger than the inner diameter of the pipe well (5); four sliding ways (6.4) which are arranged in a crisscross manner are arranged on the inner ring cover plate (6), and each sliding way (6.4) is provided with a sliding plate (6.5);
the air cushion ring is provided with the air inflation valve (7.1), and the air cushion ring has the functions of layering the pipe well, so that the length of the air inflation valve (7.1) is determined according to the depth of the air cushion ring entering the pipe well, and the air cushion ring and the inner ring cover plate form a sealing layer after being inflated.
2. An air cushion type layered vacuum pipe well according to claim 1, characterized in that the soft foundation drainage method using the air cushion type layered vacuum pipe well comprises the following steps:
step one, assembling an air cushion type layered vacuum tube well
Step two, pipe well construction:
2.1, constructing a pipe drilling well according to a common construction standard;
2.2, putting the submersible pump into the well after the well is drilled according to the standard requirement, performing test operation, and entering the next step under the condition that the well is normal in operation;
step three, layered vacuum precipitation
3.1, determining layering positions: determining the soil layer position with poor permeability coefficient according to the geological survey data or according to the construction experience of the well construction process, putting an air cushion ring into the well, and inflating the air cushion ring after the air cushion ring reaches the determined position in the pipe well to ensure that the air cushion ring is clamped at the required position;
3.2, putting an inner ring cover plate: after all the pipelines are firmly connected, the inner ring cover plate is put into the air gasket and covered on the air gasket, when the inner ring cover plate is covered on the air gasket, the sliding block on the inner ring cover plate is opened, the sliding block is blocked and opened outside and clamped on the wall of the pipe well, and after the inner ring cover plate is installed, the inner ring cover plate is connected with the vacuum pump to vacuumize.
3. An air cushion type layered vacuum pipe well according to claim 2, wherein the soft foundation drainage method using the air cushion type layered vacuum pipe well further comprises the steps of:
and (3) group well construction: when large-area precipitation construction is performed, a plurality of tube wells are necessary to form group well construction, at this time, according to design requirements, under the condition that the precipitation of the tube wells is completed, soil conditions with different layer thicknesses in the precipitation range of different tube wells are subjected to layered vacuumizing by adopting air cushion type layered vacuum tube wells, under the condition, the number of vacuum pumps used is determined according to the power of the vacuum pumps, and each vacuum pump is connected with each air cushion type layered vacuum tube well through a main pipe.
4. An air cushion type layered vacuum pipe well according to claim 2, wherein the soft foundation drainage method using the air cushion type layered vacuum pipe well further comprises the steps of: for air cushion type layered vacuum pipe well multilayer precipitation: in the actual construction process, if multiple layers of soil layers with permeability coefficients smaller than 20m/d are encountered, multiple layers of air cushion seals are determined to be arranged according to the permeability coefficients for vacuum precipitation, the method is set from bottom to top, corresponding pipelines are connected to the positions where the air cushion layers are required according to the steps 3.1 and 3.2, vacuumizing is carried out after the air cushion seals are arranged, and vacuum precipitation is carried out on the soil layers with small permeability coefficients at different depths.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109428309B (en) * | 2017-09-05 | 2021-08-13 | 中国二十冶集团有限公司 | Temporary power utilization system for foundation pit and construction method thereof |
| CN108222042A (en) * | 2018-01-09 | 2018-06-29 | 北京地矿工程建设有限责任公司 | A kind of novel evacuated well sealing device and its installation method |
| CN113550292A (en) * | 2020-04-23 | 2021-10-26 | 江苏中田地基工程有限公司 | Foundation drainage method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3776831B2 (en) * | 2001-08-27 | 2006-05-17 | 和彦 坂本 | Groundwater level lowering device |
| CN100480475C (en) * | 2007-06-04 | 2009-04-22 | 上海地矿工程勘察有限公司 | Controllable one-well lamina precipitation construction method |
| CN100516380C (en) * | 2007-06-07 | 2009-07-22 | 上海交通大学 | Method for lowering water by combining phreatic water in footing groove with artesian aquifer - well stratifications |
| CN201785761U (en) * | 2010-09-10 | 2011-04-06 | 叶吉 | Water-gas separation integrated tube well |
| CN104452734B (en) * | 2014-11-12 | 2017-02-15 | 叶吉 | Rapid soft foundation separation preloading method |
| CN105064383B (en) * | 2015-08-27 | 2017-04-26 | 冯克俊 | Pipe-inserting negative pressure air jet deep-well dewatering device |
| CN205636765U (en) * | 2016-05-04 | 2016-10-12 | 上海岩土工程勘察设计研究院有限公司 | Inflatable is from inhaling precipitation well |
| CN205636766U (en) * | 2016-05-04 | 2016-10-12 | 上海岩土工程勘察设计研究院有限公司 | Nested pumping device of pneumatic type |
| CN207003415U (en) * | 2017-04-14 | 2018-02-13 | 沈艳忱 | Air-cushion type batch vacuum pipe well |
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