CN205999897U - A kind of seepage proof curtain using dewatering well borders on the river foundation ditch - Google Patents
A kind of seepage proof curtain using dewatering well borders on the river foundation ditch Download PDFInfo
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- CN205999897U CN205999897U CN201620775326.6U CN201620775326U CN205999897U CN 205999897 U CN205999897 U CN 205999897U CN 201620775326 U CN201620775326 U CN 201620775326U CN 205999897 U CN205999897 U CN 205999897U
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- foundation ditch
- river
- well
- dewatering well
- proof curtain
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Abstract
The utility model is related to a kind of seepage proof curtain using dewatering well and borders on the river foundation ditch, belongs to design of foundation pit construction field.Bordered on the river foundation ditch using the seepage proof curtain of dewatering well, infiltration hindered using waterproof of man positioned at the foundation ditch for bordering on the river, it is characterised in that：Border on the river using some precipitation pipe wells are arranged between foundation ditch, on the inside of the waterproof of man in foundation ditch, be provided with some precipitation pipe wells.Seepage proof curtain using dewatering well described in the utility model borders on the river foundation ditch and design of foundation pit method; can occur defect infiltration coefficient quickly to start when becoming big in cut-pff wall to reduce outside level of ground water; reduce dewatering well precipitation pressure on the inside of cut-pff wall, it is ensured that foundation ditch is in dry work state.
Description
Technical field
The utility model is related to a kind of seepage proof curtain using dewatering well and borders on the river foundation ditch and method for designing, belongs to design of foundation pit
Construction field.
Background technology
It is required to arrange dewatering well in closing seepage proof curtain and curtain in the deep foundation pit under strong permeability soil condition,
With lowering of watertable, level of ground water is made all the time below excavation face or works construction surface.River or length near the foundation ditch
River position will rise very high at flood season or storm tide, then can increase head to the foundation ditch seepage proof curtain for closing at short notice
Difference, under the water difference effect that increases suddenly, then curtain can produce seepage.When running into such case in the past, pour water in foundation ditch, with
Reduce head difference inside and outside curtain, it is to avoid curtain produces seepage.But foundation ditch is soaked by water, foundation ditch bottom can be disturbed, and can also make knot
Structure thing or construction equipment are impaired because of water logging.In addition, extracting the water filled in foundation ditch also can spin out the duration.
Seepage proof curtain can effectively, successfully will ensure that foundation ditch dry work with reference to the method for dewatering well, it is likely that going out
Existing problems with：1st, cut-pff wall itself mass defect；2nd, impervious wall construction runs into underground obstacle；3rd, when dewatering well draws water, prevent
Ooze the water pressure that wall both sides are subject to and non-equilibrium state occur, be i.e. the water pressure in outside will be greater than the water pressure of inner side, cut-pff wall has
May pressurized damaged appearance weakness section.
Utility model content
The utility model not enough borders on the river foundation ditch there is provided a kind of seepage proof curtain using dewatering well and foundation ditch sets according to above-mentioned
Meter method.
The utility model is adopted the following technical scheme that：
A kind of seepage proof curtain using dewatering well described in the utility model borders on the river foundation ditch, positioned at the foundation ditch for bordering on the river using cutting
Water curtain hinders infiltration, borders on the river using some precipitation pipe wells are arranged between foundation ditch, is provided with the inside of the waterproof of man in foundation ditch
Some precipitation pipe wells.
Seepage proof curtain using dewatering well described in the utility model borders on the river foundation ditch, and described precipitation pipe well is filtered by filtrate
Net, pipe well constitute；Filtrate is provided with the outside of described pipe well；Filter screen is provided between pipe well and filtrate；Pipe well bottom is provided with end socket.
The seepage proof curtain using dewatering well described in the utility model one borders on the river the method for designing of foundation ditch, and step is as follows：
1), border on the river foundation ditch according to construction requirement Preliminary design；
2), step 1 is completed in design) after the foundation ditch that borders on the river, designing precipitation pipe in foundation ditch and between bordering on the river；
3), according to equation below calculation procedure 2) in downcomer adopt specification
4), according to equation below calculation procedure 2) in downcomer adopt traffic profile
5), according to above-mentioned steps 3) and step 4) downcomer specification, simulation calculate homogeneous aquifer partially penetrating well base
Hole water yield；
6), precipitation pipe well quantity of meeting an urgent need is determined according to Pit Discharge；
7), phreatic aquifer Seepage of Foundation Pit stability is checked, completes to calculate.
Seepage proof curtain using dewatering well described in the utility model borders on the river the method for designing of foundation ditch, step 5) in by such as
Lower formula
Calculate Pit Discharge.
Seepage proof curtain using dewatering well described in the utility model borders on the river the method for designing of foundation ditch, step 7) in by such as
Lower formula
Checking computations water-bearing layer Seepage of Foundation Pit stability.
Beneficial effect
Seepage proof curtain using dewatering well described in the utility model borders on the river foundation ditch and design of foundation pit method, can be in antiseepage
Quickly start the reduction of outside level of ground water when wall occurs defect infiltration coefficient to become big, reduce dewatering well precipitation pressure on the inside of cut-pff wall
Power, it is ensured that foundation ditch is in dry work state.
Description of the drawings
Fig. 1 is arrangement and method for construction figure in prior art；
Fig. 2 is arrangement and method for construction figure of the present utility model；
Fig. 3 is downcast well pipe structural representation of the present utility model；
Fig. 4 is Fig. 3 downcast well pipe overlooking the structure diagram；
Fig. 5 is homogeneous aquifer diving partially penetrating well Pit Discharge simulation schematic diagram；
Fig. 6 is stream soil checking computations simulation drawing of the present utility model；
Fig. 7 is the disconnected figure of dewatering well arrangement of meeting an urgent need outside the utility model flour sand soil property deep foundation pit curtain；
Fig. 8 is fast rainfall well process chart after the utility model cut-pff wall.
Specific embodiment
Purpose and technical scheme for making the utility model embodiment is clearer, implements below in conjunction with the utility model
The accompanying drawing of example, the technical scheme to the utility model embodiment are clearly and completely described.Obviously, described embodiment
It is a part of embodiment of the present utility model, rather than whole embodiments.Based on described embodiment of the present utility model,
The every other embodiment obtained on the premise of without the need for creative work by those of ordinary skill in the art, belongs to this practicality
Novel protected scope：
As shown in the figure：A kind of seepage proof curtain using dewatering well borders on the river foundation ditch, adopts waterproof of man 6 positioned at the foundation ditch for bordering on the river
Hinder infiltration, it is characterised in that：Border on the river using some precipitation pipe wells 5 of setting between foundation ditch, in the waterproof of man 6 in foundation ditch
Side is provided with some precipitation pipe wells 5.Precipitation pipe well is made up of filtrate 1, filter screen 2, pipe well 3；Described 3 outside of pipe well is provided with filtrate
1；Filter screen 2 is provided between pipe well 3 and filtrate 1；3 bottom of pipe well is provided with end socket 4.
Precipitation pipe well is designed
In formula：q0----individual well capacity of outlet water (m3/d)；
rs-- filter radius (m)；
L-- filter water inlet portion length (m)；
K----- AQUIFER HYDRAULIC (m/d)；
The indoor infiltration coefficient that k---- AQUIFER HYDRAULIC is provided using the report of project geological mapping, works as conditions permit,
Can also scene carry out bailing test, according to pumping test data calculate soil layer infiltration coefficient.
The design discharge of dewatering well individual well can be as follows by foundation ditch total water-flowing amount such as formula：
According to《Building foundation pit supporting technical regulation》Described in (JGJ 120-2012)；
In formula：Q---- individual well design discharge；
Q---- base pit dewatering total yield (m3/ d), calculate by corresponding conditionses formula in foundation ditch annex E.
N---- dewatering well quantity.
The Pit Discharge of homogeneous aquifer partially penetrating well is calculated
Height of water level (m) after H---- precipitation in foundation ditch；
The length (m) of l---- filter water inlet portion.
r0----foundation ditch equivalent redius (m)；Can pressCalculate；
Determine precipitation pipe well quantity of meeting an urgent need
According to water level, infiltration coefficient, single inlet pipe well yield and foundation ditch total yield in the outer close river course of cut-pff wall, meter
Calculate the pipe well quantity for needing to arrange.Test well is set on the spot if necessary, and by the diving that places in advance Rainfall Estimation well
Pump power places immersible pump.After bailing test, optimize pipe well of meeting an urgent need and pipe well is set apart from seepage proof curtain distance, well depth, spacing
And implement, after the parameters such as pump power of diving under water, dewatering well of meeting an urgent need.
Emergent precipitation pipe well daily need is safeguarded, needs to draw water at intervals, to prevent pipe well to silt up.Prearranging should
Plunge water pipe manhole person on duty, runs into the situation that water level rises suddenly after tornado etc. causes curtain, stands after project management department leader is asked for instructions
Emergent dewatering well is opened, reduces level of ground water after seepage proof curtain, till safety level is met.
Phreatic aquifer Seepage of Foundation Pit Stability Checking
This foundation ditch is silt, sand water-bearing layer, arranges suspended cutoff, the bottom of suspension type waterproof of man be located at sand or
In silt water-bearing layer, the stream soil stabilization of seepage action of ground water is according to evidence《Building foundation pit supporting technical regulation》(JGJ120-
2012) C.0.2 annex formula calculates, referring to lower Fig. 5.
In formula：Kf----stream soil stabilization safety coefficient；Safe class is one, two, three supporting construction, KfRespectively not
Should be less than 1.6,1.6,1.4.
ld--- insertion depth (m) of-waterproof of man below the bottom of hole；
D1--- the soil thickness (m) of-phreatic surface top surface to foundation ditch bottom surface；
R ' --- the buoyant weight degree (kN/m of-soil3)；
Head difference (m) inside and outside Δ h---- foundation ditch；
rw--- the severe (kN/m of-water3)；
Foundation ditch 100 × 35m of size suitable for reading, foundation ditch depth 6m, have a river course at 32.5m, have water throughout the year, affected by sudden and violent water
Eagre is very fast, and entail dangers to, in hole seepage proof curtain safety, is that this sets the emergent downcomer of a row in advance between river course and foundation ditch
Well.Tubes welding concentrates season to start after emergent dewatering well reduces curtain in time as shown in Figure 7 and Figure 8, in flood season or rainfall
Lower water level, has ensured safety and the duration of the whose foundation pit.
The above, only the utility model preferably specific embodiment, but protection domain of the present utility model is not
This is confined to, any those familiar with the art can be readily occurred in the technical scope that the utility model is disclosed
Change or replacement, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is defined by scope of the claims.
Claims (2)
1. a kind of seepage proof curtain using dewatering well borders on the river foundation ditch, adopts waterproof of man positioned at the foundation ditch for bordering on the river（6）Hinder infiltration,
It is characterized in that：Border on the river using some precipitation pipe wells of setting between foundation ditch（5）, waterproof of man in foundation ditch（6）Inner side sets
There are some precipitation pipe wells.
2. the seepage proof curtain using dewatering well according to claim 1 borders on the river foundation ditch, it is characterised in that：Described downcomer
Well（5）By filtrate（1）, filter screen（2）, pipe well（3）, end socket（4）Composition；Described pipe well（3）Outside is provided with filtrate（1）；Pipe well
（3）With filtrate（1）Between be provided with filter screen（2）；Pipe well（3）Bottom is provided with end socket（4）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620775326.6U CN205999897U (en) | 2016-07-22 | 2016-07-22 | A kind of seepage proof curtain using dewatering well borders on the river foundation ditch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620775326.6U CN205999897U (en) | 2016-07-22 | 2016-07-22 | A kind of seepage proof curtain using dewatering well borders on the river foundation ditch |
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| Publication Number | Publication Date |
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| CN205999897U true CN205999897U (en) | 2017-03-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106436717A (en) * | 2016-07-22 | 2017-02-22 | 江苏科兴项目管理有限公司 | Impervious curtain river-near foundation pit adopting dewatering wells and design method |
| CN109113076A (en) * | 2018-10-12 | 2019-01-01 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of sinking tunnel Support of Foundation Pit Excavation near a river and drop water-stopping method and its structure |
| CN109972643A (en) * | 2019-05-06 | 2019-07-05 | 中国人民解放军空军工程大学 | A kind of region of FuShui base pit engineering Trinity joint precipitation system |
| CN113605428A (en) * | 2021-07-30 | 2021-11-05 | 中煤长江基础建设有限公司 | Method for rapidly treating soft construction surface of pile foundation in sandy soil area |
-
2016
- 2016-07-22 CN CN201620775326.6U patent/CN205999897U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106436717A (en) * | 2016-07-22 | 2017-02-22 | 江苏科兴项目管理有限公司 | Impervious curtain river-near foundation pit adopting dewatering wells and design method |
| CN109113076A (en) * | 2018-10-12 | 2019-01-01 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of sinking tunnel Support of Foundation Pit Excavation near a river and drop water-stopping method and its structure |
| CN109972643A (en) * | 2019-05-06 | 2019-07-05 | 中国人民解放军空军工程大学 | A kind of region of FuShui base pit engineering Trinity joint precipitation system |
| CN113605428A (en) * | 2021-07-30 | 2021-11-05 | 中煤长江基础建设有限公司 | Method for rapidly treating soft construction surface of pile foundation in sandy soil area |
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