CN106894429B - Base pit engineering soft soil foundation is layered dewatering construction structure and construction method - Google Patents
Base pit engineering soft soil foundation is layered dewatering construction structure and construction method Download PDFInfo
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- CN106894429B CN106894429B CN201710246596.7A CN201710246596A CN106894429B CN 106894429 B CN106894429 B CN 106894429B CN 201710246596 A CN201710246596 A CN 201710246596A CN 106894429 B CN106894429 B CN 106894429B
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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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of base pit engineering soft soil foundation layering dewatering construction structure and construction method, comprising: the first well casing, the second well casing, water barrier, immersible pump, deep well pump, precipitation general pipeline and switch valve；Immersible pump, deep well pump pass through switch valve respectively and are connected with precipitation general pipeline；First well casing is arranged as the first depth, and the second well casing is arranged as the second depth greater than the first depth；Second well casing is set as the first caliber, and the first well casing is set greater than the second caliber of the first caliber；Second well casing is set in first well casing, is arranged concentrically with the first well casing；Space between first well casing and the second well casing forms annular channel, and water barrier is set in circular passage；Water barrier lower space is filled by back-up sand；Immersible pump is set in the annular channel between the first well casing and the second well casing；Deep well pump is set in the second well casing.
Description
Technical field
The present invention designs the constructing structure and construction method of a kind of architectural engineering underground foundation.
Background technique
With the high speed development of economic construction of China, in order to more fully utilize soil, on the one hand, high-rise, Super High is built
It builds and is continuously increased, on the other hand, people are also increasingly utilized the underground space, build large-scale municipal works such as underground and stop
Parking lot, large underground station, underground substation, market place builet below the ground, underground civil defence fortification etc..Either High-Rise Building Deep Foundation is applied
The utilization of work or the underground space requires to carry out large-scale underground excavation, promotes base pit engineering fast-developing.
During Foundation Pit Construction, base pit dewatering technology plays very important effect, base to the guarantee of construction quality
Cheating precipitation is often a key factor for determining deep-foundation pit engineering success or failure.Base pit dewatering method is exactly that level of ground water is passed through well point
Method reduced.Wherein, it handles base pit dewatering underground water in the construction process to be very important, if do not carried out
Base pit dewatering, it is possible to the landslide occurred due to quicksand phenomenon occur and the progress of construction is destroyed and influenced in address, while is internal
Biggish displacement occurs for soil mass of foundation pit, will affect the safety of close to buildings.
When specifically designing base pit dewatering, water-bearing layer is carried out generally according to geologic prospect result to be divided into two
Part: first layer shallow aquifer is phreatic aquifer, and stratum is mainly made of flour sand and silt, needs in base pit dewatering
Carry out drainage: the second layer is the artesian aquifer of higher depth, is fed mainly from the leakage of Atmospheric precipitation and domestic water, foundation pit
Foundation Pit Pouring is formed when being excavated to certain depth to need to carry out Dewatering by pressure reduction using for artesian aquifer.
In the prior art, phreatic aquifer is typically employed in for the precipitation of foundation pit and drainage is respectively set in artesian aquifer
The mode of well and pressure reduction well carries out drainage to phreatic aquifer using drainage well before excavation of foundation pit, in excavation of foundation pit to pressure-bearing
Behind water-bearing layer, artesian aquifer is depressurized until foundation pit intensity is eligible by pressure reduction well.But this method so that
Pipe well quantity is more in base pit engineering, and construction cost is big, and constructing operation process is elongated, and makes troubles to construction.
In order to solve the above-mentioned technical problem, a kind of improved foundation pit drop is proposed in 200710041603 patent of invention
Water constructing structure, drainage well and pressure reduction well are integrated, and controllable antipriming is arranged in well casing, aqueous dive under water
Controllable antipriming is closed when layer drainage, is drained using immersible pump；When excavation arrives artesian aquifer, controllable sealing is opened
Device takes out immersible pump, and deep well pump is placed in bottom, carries out Dewatering by pressure reduction.In this way, well spacing quantity can be reduced, drop
Low operating expenses saves construction cost.But need to be arranged in pipe well in the invention controllable antipriming avoid diving under water it is aqueous
Layer, which draws water, is drawn into the water of artesian aquifer, and setting is complicated, needs to carry out controllable sealing dress during drainage and decompression
The switching of state is set, is opened and closed and inconvenient, and need to carry out the replacement of immersible pump and deep well pump.
Summary of the invention
The present invention provides a kind of improved soft soil foundation layering dewatering construction structure and construction method, can be realized by
Drainage well and pressure reduction well merge, while not needing that controllable antipriming is arranged, and also do not need to carry out replacing for immersible pump and deep well pump
It changes.
As one aspect of the present invention, a kind of soft soil foundation layering dewatering construction structure is provided, comprising: the first well
Pipe, the second well casing, water barrier, immersible pump, deep well pump, precipitation general pipeline and switch valve；The immersible pump, deep well pump pass through respectively
Switch valve is connected with the precipitation general pipeline；First well casing is arranged as the first depth, and second well casing is arranged as being greater than the
Second depth of one depth；Second well casing is set as the first caliber, and first well casing is set greater than the first caliber
Second caliber；Second well casing is set in first well casing, is arranged concentrically with first well casing；First well casing
And the second space between well casing forms annular channel, the water barrier is set in the circular passage；Under the water barrier
Side space is filled by back-up sand；The immersible pump is set in the annular channel between first well casing and the second well casing；It is described
Deep well pump is set in second well casing.
Preferably, the soft soil foundation layering dewatering construction structure is constructed for base pit dewatering.
Preferably, first depth corresponds to ground phreatic aquifer depth；Second depth is held corresponding to ground
Press aqueous layer depth.
Preferably, the depth of the water barrier is set between phreatic aquifer and the ground artesian aquifer.
Preferably, second well casing includes first part and second part, the first part be lower than it is described every
Permeable through-hole is arranged in the part of water layer, tube wall；The second part is the part higher than the water barrier, and tube wall is set as
Sealing state.
Preferably, permeable through-hole is arranged in the tube wall of first well casing.
Preferably, the cross-sectional area of first well casing is 2~3 times of the second well casing cross-sectional area.
Preferably, the certain bits on the first chassis of its outer wall, first chassis are arranged in second well casing bottom
It installs around the second chassis of its outer wall；The caliber phase of the outer diameter on first chassis and the second chassis and first well casing
Together.
As another aspect of the present invention, the dewatering construction side of above-mentioned soft soil foundation layering dewatering construction structure is provided
Method includes the following steps: that (1) setting soft soil foundation is layered dewatering construction structure；(2) it before excavation of foundation pit, opens immersible pump and passes through
First well casing carries out drainage precipitation for phreatic aquifer；(3) excavation of foundation pit, the depth that excavation of foundation pit is depressured to needs are carried out
Afterwards, precipitation, controlling groundwater level are carried out for artesian aquifer by the second well casing interval according to the progress of excavation；(4) foundation pit is opened
Digging finishes and structural strength reaches requirement, terminates dewatering construction.
Detailed description of the invention
Fig. 1 is the schematic diagram of the soft soil foundation layering dewatering construction structure of the embodiment of the present invention.
Fig. 2 is the schematic diagram of the soft soil foundation layering dewatering construction structure of the preferred embodiment of the present invention.
It is that the soft soil foundation of strength is layered the schematic diagram of dewatering construction structure that Fig. 3, which is presently preferred,.
Specific embodiment
In order to illustrate more clearly of technical solution of the present invention, embodiment will be used simply to be situated between the present invention below
Continue, it should be apparent that, be described below in be only one embodiment of the present of invention, for those of ordinary skill in the art come
It says, without any creative labor, other technical solutions can also be obtained according to these embodiments, also belonged to
Disclosure of the invention range.
The soft soil foundation of the embodiment of the present invention is layered dewatering construction structure, referring to Fig. 1, comprising: the first well casing 10, the second well
Pipe 20, water barrier 30, immersible pump 40, deep well pump 50, precipitation general pipeline 60 and switch valve 70,80.First well casing 10 is used for foundation pit
Drainage aqueous in phreatic aquifer before constructing is circular pipe, and permeable through-hole is arranged in tube wall, and depth is in phreatic aquifer
With the middle layer position of artesian aquifer.Filtrate is filled outside first well casing 10, filtrate can be back-up sand.
Second well casing 20 is depressured for artesian aquifer, and bottom is set in artesian aquifer.Second well casing 20
It for round pipe road, is set in the first well casing 10, is arranged concentrically with the first well casing 10, the cross-sectional area of the first well casing 10 is second
2~3 times of 20 cross-sectional area of well casing, to be formed between the first well casing 10 and the second well casing 20 for phreatic aquifer drainage
Precipitation channel 11.The top of second well casing 20 is consistent with the first well casing 10, and the depth of the second well casing 20 is greater than the first well casing 10
Depth is set in artesian aquifer.Water barrier 23 is arranged in the bottom of second well casing 20, and such as clay can be used in water barrier 23
Impervious barrier.
Water barrier 30, the depth setting of water barrier 30 are set outside 20 outer ring of bottom and the second well casing of the first well casing 10
Between phreatic aquifer and artesian aquifer.Water barrier 30 can be set to such as clay lenses.
Second well casing 20 includes first part 21 and second part 22, and first part 21 is the portion lower than water barrier 30
Point, permeable through-hole is arranged in tube wall, for introducing the water of artesian aquifer；Second part 22 is the part higher than water barrier 30,
Its tube wall is set as sealing state.The precipitation channel 24 of artesian aquifer is formed in second well casing 20.
Immersible pump 40 is set in the cyclic annular precipitation channel 11 between the first well casing 10 and the second well casing 20, for for base
Aqueous carry out drainage in the phreatic aquifer in hole.Immersible pump 40 is communicated by switch valve 70 with precipitation general pipeline 60.Deep well pump 50
It is set in the precipitation channel 24 in the second well casing 20, for carrying out precipitation to artesian aquifer.Deep well pump 50 passes through switch valve
80 communicate with precipitation general pipeline 60.
The present invention is the soft soil foundation layering dewatering construction structure of embodiment, filter material layer can be arranged in precipitation channel,
To be filtered before immersible pump 40 or deep well pump 50 for precipitation.
The construction method of the soft soil foundation layering dewatering construction structure of the embodiment of the present invention, includes the following steps: (1) unwrapping wire
Positioning；(2) it is laid with precipitation general pipeline；(3) giant water is washed into the first depth and the first caliber, wherein the first caliber is the first well
10 caliber of pipe, the first depth are 20 caliber of the second well casing；(4) it is laid with water barrier 23；(5) the second well casing 20 is centrally located,
Layering inserts coarse sand to the middle layer position of phreatic aquifer and artesian aquifer outside second well casing 20；(6) in the second well casing 20
Outer middle layer position is laid with water barrier 30；(7) the first well casing 10 is centrally located on water barrier 30, it is preferred that can every
Certain thickness fixing layer is inserted on water layer 30, and the first well casing 10 is fixed on fixing layer；(8) it is layered outside the first well casing 10
Insert coarse sand until close at the top of the first well casing 10, it is preferred that sealing section can be set at the top of the first well casing 10；(9)
Deep well pump 50 is set in two well casings 20；(10) it is arranged in the annular precipitation channel between the first well casing 10 and the second well casing 20 latent
Water pump 40；(11) the first well casing 10 and the second well casing 20 are connected with bent union respectively；(12) respectively by switch valve 70 and 80 with
Precipitation general pipeline connection.
Soft soil foundation is layered the dewatering construction method of dewatering construction structure, includes the following steps: (1) setting soft soil foundation point
Layer dewatering construction structure；(2) before excavation of foundation pit, immersible pump 40 is opened by the first well casing 10, drainage is carried out for phreatic aquifer
Property precipitation；(3) excavation of foundation pit is carried out, excavation of foundation pit is opened deep well pump 50 and led to according to the progress of excavation to after needing the depth that is depressured
It crosses 20 interval of the second well casing and precipitation, controlling groundwater level is carried out for artesian aquifer；(4) excavation of foundation pit finishes and structure is strong
Degree reaches requirement, terminates dewatering construction.
The place respectively for diving under water with artesian water is realized in the setting of above-described embodiment through the invention in same pipe well
Reason, while not needing that controllable antipriming is arranged, diving and artesian water do not influence mutually in Precipitation Process, also do not need to carry out
The replacement of immersible pump and deep well pump.
One preferred embodiment of invention, may refer to Fig. 2, be arranged the around its outer wall in 20 bottom of the second well casing
One chassis 25, specific position is arranged around the second chassis 26 of its outer wall on the first chassis 25；First chassis 25 and the second bottom
Disk 26 can be connected through a screw thread fixed with the second pipe well 20.The outer diameter and the first well casing 10 on the first chassis 25 and the second chassis 26
Caliber it is identical.Setting in this way can fix the second well casing 20, it is avoided to go out when phreatic aquifer carries out precipitation
Existing positional shift influences base pit dewatering.
A further preferred embodiment of the invention, referring to Fig. 3, water barrier 30 includes left side 31 and right side
32, immersible pump 40 is set on left side 31, and the height of water barrier 30 left side 31 and right side 32 is arranged, makes right side 32
Height is higher than the height of left side 31, to make the water energy in precipitation channel 24 enough substantially arrive at the position of immersible pump 40, further
Promote the draining of immersible pump 40.
Above according to specifically exemplary embodiments describe the present invention.Those skilled in the art is come
It says and is carrying out replacement appropriate without departing from the scope of the invention or modifying will be apparent.Exemplary embodiment is only
It is illustrative, rather than limits the scope of the present invention, the scope of the present invention is defined by the appended.
All references mentioned in the present invention all incorporated by reference in this application, are individually recited just as each document
As with reference to such.In addition, it should also be understood that, protection scope of the present invention is not after having read above disclosure of the invention
It is limited only to above-described embodiment, those skilled in the art can make various modifications or changes to the present invention, is not departing from the present invention
Under the premise of principle, these equivalent forms also fall within the scope of the appended claims of the present application.
Claims (4)
1. a kind of soft soil foundation is layered dewatering construction structure, comprising: the first well casing, the second well casing, water barrier, immersible pump, deep-well
Pump, precipitation general pipeline and switch valve；The immersible pump, deep well pump pass through switch valve respectively and are connected with the precipitation general pipeline；It is special
Sign is: first well casing is arranged as the first depth, and second well casing is arranged as the second depth greater than the first depth；Institute
The first well casing is stated for carrying out drainage precipitation for phreatic aquifer；Second well casing is used to carry out artesian aquifer
Precipitation；First depth corresponds to ground phreatic aquifer depth；It is deep that second depth corresponds to ground artesian aquifer
Degree；Second well casing is set as the first caliber, and first well casing is set greater than the second caliber of the first caliber；Described
Two well casings are set in first well casing, are arranged concentrically with first well casing；Between first well casing and the second well casing
Space form annular channel, the water barrier is set in the annular channel；The depth of the water barrier is set to diving
Middle layer between water-bearing layer and the ground artesian aquifer；The water barrier lower space is filled by back-up sand；The diving
Pump is set in the annular channel between first well casing and the second well casing；The deep well pump is set to second well casing
It is interior.
2. soft soil foundation according to claim 1 is layered dewatering construction structure, it is characterised in that: it is used for base pit dewatering and applies
Work.
3. soft soil foundation according to claim 2 is layered dewatering construction structure, it is characterised in that: the cross of first well casing
Sectional area is 2~3 times of the second well casing cross-sectional area.
4. a kind of dewatering construction method of soft soil foundation layering dewatering construction structure according to claim 1, including it is as follows
Step: (1) soft soil foundation be set and is layered dewatering construction structure；(2) before excavation of foundation pit, open immersible pump by the first well casing for
Phreatic aquifer carries out drainage precipitation；(3) excavation of foundation pit is carried out, after excavation of foundation pit to the depth that is depressured of needs, according to excavation
Progress carries out precipitation, controlling groundwater level for artesian aquifer by the second well casing interval；(4) excavation of foundation pit is finished and is tied
Structure intensity reaches requirement, terminates dewatering construction.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710246596.7A CN106894429B (en) | 2017-04-16 | 2017-04-16 | Base pit engineering soft soil foundation is layered dewatering construction structure and construction method |
| CN201810943574.0A CN108824465B (en) | 2017-04-16 | 2017-04-16 | Foundation pit engineering dewatering construction structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710246596.7A CN106894429B (en) | 2017-04-16 | 2017-04-16 | Base pit engineering soft soil foundation is layered dewatering construction structure and construction method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810943574.0A Division CN108824465B (en) | 2017-04-16 | 2017-04-16 | Foundation pit engineering dewatering construction structure and construction method |
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| Publication Number | Publication Date |
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| CN106894429A CN106894429A (en) | 2017-06-27 |
| CN106894429B true CN106894429B (en) | 2019-03-01 |
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| CN201710246596.7A Active CN106894429B (en) | 2017-04-16 | 2017-04-16 | Base pit engineering soft soil foundation is layered dewatering construction structure and construction method |
| CN201810943574.0A Active CN108824465B (en) | 2017-04-16 | 2017-04-16 | Foundation pit engineering dewatering construction structure and construction method |
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| CN113957917B (en) * | 2021-11-11 | 2023-03-31 | 同济大学 | Taiji type internal partition wall one-hole multi-channel mixing well |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3338909B2 (en) * | 1994-01-19 | 2002-10-28 | 清水建設株式会社 | Layered pumping well |
| 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 |
| CN101363228A (en) * | 2008-05-23 | 2009-02-11 | 上海广联建设发展有限公司 | Tube well for simultaneously dewatering and decompressing and technology thereof |
| CN102518141B (en) * | 2011-12-19 | 2013-12-25 | 同济大学 | Deep foundation pit dewatering and decompressing combination well controlled in subsection manner |
| CN203768924U (en) * | 2014-02-19 | 2014-08-13 | 中亿丰建设集团股份有限公司 | Tubular well used for simultaneously draining and decompressing precipitation |
| CN203729314U (en) * | 2014-02-28 | 2014-07-23 | 华南理工大学 | Anti-floating relief well |
| CN205444219U (en) * | 2015-12-29 | 2016-08-10 | 上海广联环境岩土工程股份有限公司 | Precipitation tubular well that decompression was held concurrently to foundation ditch dry out |
| CN206090597U (en) * | 2016-09-28 | 2017-04-12 | 上海广联环境岩土工程股份有限公司 | Haplopore multitube tubular well |
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2017
- 2017-04-16 CN CN201710246596.7A patent/CN106894429B/en active Active
- 2017-04-16 CN CN201810943574.0A patent/CN108824465B/en active Active
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| Publication number | Publication date |
|---|---|
| CN108824465B (en) | 2020-12-08 |
| CN106894429A (en) | 2017-06-27 |
| CN108824465A (en) | 2018-11-16 |
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Effective date of registration: 20190118 Address after: Room 1, 2, 3, 4, 5, 6, 7, 8, Unit 26, Building A, No. 140 Hanyang Avenue, Hanyang District, Wuhan City, Hubei Province Applicant after: Wuhan Bohong Construction Co., Ltd. Address before: No. 79, Gao Zhuang Qiao Road, Xingtai, Hebei Province Applicant before: Han Shaopeng |
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