CN102383437B - Well point positioned pumping tubular well and well point positioned pumping method - Google Patents
Well point positioned pumping tubular well and well point positioned pumping method Download PDFInfo
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- CN102383437B CN102383437B CN201110224948.1A CN201110224948A CN102383437B CN 102383437 B CN102383437 B CN 102383437B CN 201110224948 A CN201110224948 A CN 201110224948A CN 102383437 B CN102383437 B CN 102383437B
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Abstract
The invention is applied to the field of drain of tubular wells and provides a well point positioned pumping tubular well and a well point positioned pumping method. The pumping tubular well comprises a sand-free tube well section and a water storage tube well section, wherein the sand-free tube well section is positioned above a certain position of a first water-resisting layer below the precipitation depth of a foundation pit and is used for collecting a water source in a water-containing layer within the precipitation depth of the foundation pit; and the water storage tube well section is positioned below the certain position of the first water-resisting layer below the precipitation depth of the foundation pit, is connected with the sand-free tube well section and is used for storing the water source in the water-containing layer within the precipitation depth of the foundation pit. According to the well point positioned pumping tubular well and the well point positioned pumping method disclosed by the invention, by adopting a precipitation tubular well consisting of the sand-free tube well section and the water storage tube well section, the water source in the water-containing layer within the precipitation depth of the foundation pit is effectively collected, the effect that more water and the precipitated water are pumped without polluting an underground water source in an independent water-containing source below the precipitation depth of the foundation pit is realized, and the difficult problem that the water cannot be dredged under the condition that water cannot be dredged is solved. In addition, by adopting an automatic pumping method with a positioned water level, the total pumping time is greatly shortened and the cost of foundation pit engineering is greatly reduced.
Description
Technical field
The invention belongs to pipe well draining field, particularly relate to a kind of well point positioning water pumping tube well and draw water method in location, well point.
Background technology
No matter being Tall Building Foundation or underground building, when being positioned at below groundwater table, generally all needing dewatering, to ensure facility and the safety of construction.Foundation pit dewatering, by pump drainage mode, reduces the water level of underground water within the scope of foundation ditch, within a certain period of time to ensure the construction environment of excavation of foundation pit, simultaneously for base plate of foundation pit and the stable of side slope provide powerful guarantee.From groundwater control mode, foundation ditch groundwater control method has two large classes: water-stop method and precipitation method.Water-stop method, namely by effective means, forms water-stop curtain, is terminated in by underground water outside foundation ditch, curtain as vertical in antiseepage, diaphragm wall etc. around foundation ditch; Precipitation method reduces, underground water within the scope of foundation ditch as gutter drainage method, well-point dewatering method etc.At present, what be widely adopted in base pit engineering is precipitation method.Precipitation method has vertical well point method, from seepage well method, radial method, and combined method.
In these conventional vertical well-points dewatering, often can run into a kind of phenomenon, namely in peupendicular hole, water one takes out i.e. nothing, and one stops and has, and still has water during excavation.People are called " dredge and do not do " phenomenon this phenomenon.Theoretically, " dredge and do not do " in situation about being present in as shown in Figure 1, namely, no matter how vertical pumping well point is arranged, how large intensity of drawing water is, always there is a certain amount of underground water in bottom interface place, aquifer, causes part location in foundation ditch to be under theoretical phreatic line, and the groundwater table also namely within the scope of foundation ditch all cannot be down to 0.5m under foundation ditch.
" dredge and do not do " phenomenon to make still to there is underground water in aquifer, during excavation of foundation pit, residual water flows in foundation ditch along foundation pit side-wall, and make the foundation ditch scope of operation muddy, workman's constructional difficulties, affects construction speed; Sidewall infiltration also can make slope retaining lose efficacy.Cheat outer water and carry fine particle to seepage flow in foundation ditch, soil particle moves along with current, just creates quicksand phenomenon.When the soil particle size differences in soil layer is comparatively large, when lacking certain particle diameter, fine grained will move in coarse granule gap with current, form continuous print passage, i.e. a Piping phenomenon.Quicksand, Piping phenomenon make soil layer be emptied, and cause Earth cave, the engineering accident such as even cause foundation ditch slippage, cave in, and cause the loss of manpower and materials.
When there is multiple underground reservoir in project site, due to the objective reality of cone of depression, the pipe well buried depth of well-points dewatering must be far longer than the degree of depth of foundation ditch, elongated filter pipe length is very large, namely pipe well inlet segment is very long, to cause in foundation pit dewatering process the water in not only pump drainage foundation pit dewatering depth bounds, and extract the water resource of the independent aquifer of below the foundation pit dewatering degree of depth (can be multiple).But the underground water in independent aquifer below the foundation pit dewatering degree of depth (can be multiple) exists hardly on base pit engineering impact.Meanwhile, because the existence of pipe well makes the underground water in the multilayer independence aquifer in pipe well depth bounds through.As everyone knows, in aquifer, top, underground water communicates with air, large by the effect of human activity, how contaminated, and more up in aquifer underground water contaminated relatively heavier.Top contaminated underground water will enter into aquifer, bottom along pipe well under its Action of Gravity Field, and the bottom very pure underground water of script is also polluted to some extent.Therefore, the way of current foundation pit dewatering had both caused the waste of resource, turn increased engineering cost, more seriously polluted the groundwater resources of bottom high-quality.
Summary of the invention
The object of the present invention is to provide a kind of well point positioning water pumping tube well, be intended to solve (1) foundation ditch peupendicular hole point dewatering and " dredge and do not do " problem, namely, in conventional vertical well-points dewatering, in peupendicular hole, water one takes out i.e. nothing, one stops and has, water is still had during excavation, make the foundation ditch scope of operation muddy, workman's constructional difficulties, affect construction speed, foundation pit side-wall infiltration also can make slope retaining lose efficacy, produce quicksand phenomenon, in soil, fine grained moves in coarse granule gap with current, soil layer is emptied, cause Earth cave, even cause foundation ditch slippage, cave in, cause the problem that manpower and materials are lost.(2) protection problem of water resource in independent aquifer below the foundation pit dewatering degree of depth.
The object of the present invention is to provide a kind of well point positioning water pumping tube well, this pipe well comprises without sandpipe well section, water storage pipe well section:
Be positioned at more than the first water barrier position of below the foundation pit dewatering degree of depth, for gather water source in the aquifer in foundation pit dewatering depth bounds without sandpipe well section;
Below the first water barrier position being positioned at below the described foundation pit dewatering degree of depth, be connected without sandpipe well section with described, for storing the water storage pipe well section at water source in the aquifer in described foundation pit dewatering depth bounds.
Another object of the present invention is to provide a kind of well point to locate pumping method, the method comprises:
Location, a kind of well point pumping method, the method comprises:
By the comprehensive transmission coefficient of soil layer between underground water level to water storage pipe well section top, aquifer thickness and drawdown determination well spacing;
First water barrier position below the foundation pit dewatering degree of depth up adopts without sandpipe well section;
First water barrier position below the foundation pit dewatering degree of depth down adopts water storage pipe well section;
Pumping equipment is utilized to determine the water source of water level extraction water storage pipe well section storage.
The present invention is by adopting without sandpipe well section, the precipitation pipe well of water storage pipe well section composition, effectively gather the water source in aquifer in foundation pit dewatering depth bounds, pumping equipment is utilized to determine the water source of water level extraction water storage pipe well section storage, solve water one in peupendicular hole and take out i.e. nothing, one stops and has, water is still had during excavation, make the foundation ditch scope of operation muddy, workman's constructional difficulties, affect construction speed, foundation pit side-wall infiltration makes slope retaining lose efficacy, produce quicksand phenomenon, in soil, fine grained moves in coarse granule gap with current, soil layer is emptied, cause Earth cave, even cause foundation ditch slippage, cave in, manpower and materials are caused to lose problem.Solve simultaneously and seldom draw water, take out the difficult problem that precipitation does not pollute " dredge and do not do " under underground water source in the independent aquifer of below the foundation pit dewatering degree of depth and " dredge and do not do " condition.Adopt and determine water level automatic pumping method, will make to draw water shortens dramatically total time, greatly reduces base pit engineering cost.Today that, water environment day by day deficient in current water resource and water resource come into one's own day by day, there is obvious social benefit and economic benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation that prior art provides " dredge and do not do " aquifer;
Fig. 2 is the cross-sectional view of well point positioning water pumping tube well provided by the invention;
Fig. 3 is the flow chart of location, well point provided by the invention pumping method.
In figure: 1, without sandpipe well section; 2, water storage pipe well section; 3, aquifer, top; 4, aquifer, bottom; 5, foundation ditch; 6, water barrier.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 2 shows the structural representation of the well point positioning water pumping tube well that the embodiment of the present invention provides.For convenience of explanation, illustrate only the part relevant to the embodiment of the present invention.
This pipe well comprises:
Be positioned at more than certain position of the first water barrier 6 of below foundation ditch, for gather water source in the aquifer, top 3 within the scope of foundation ditch 5 precipitation depth without sandpipe well section 1;
Below certain position being positioned at the first water barrier 6 of below foundation ditch, be connected with without sandpipe well section 1, for storing the water storage pipe well section 2 at water source in aquifer, top 3.
In embodiments of the present invention, water storage pipe well section 2 is without sandpipe well section or steel tube well section or real wall cement pipe well section, when selecting without sandpipe, must be coated with grout layer outside it.
In addition, in embodiments of the present invention, prefabricated double-wall pipe can also be adopted, maybe can claim combination wall pipe (the real wall of thin cement mortar outer and without sandpipe internal layer two kinds of standpipes combined).Double-wall pipe is exactly double-layer circular ring on section, outer waterproof, very thin, and internal layer is relatively very thick, can be permeable, but whole this combined double-layer wall pipe is waterproof.What the outside described in patent of the present invention scribbled grout layer in fact also belongs to this double wall pipe structure without sandpipe, and just its outer grout layer is thinner, and outer wall preparation method is different.When hydraulic pressure is very large, adopt the meeting of this prefabricated double-wall pipe better.
In embodiments of the present invention, sealing material layer is filled with outside water storage pipe well section 2.
In embodiments of the present invention, the tube coupling junction of water storage pipe well section is provided with sealing collar pad.The determination of first water barrier position below the foundation pit dewatering degree of depth need consider the impact of its lower aquifer hydraulic pressure, should guarantee that this aquifer water is not prominent and gush by entering in water storage pipe well section without sandpipe well section.
In embodiments of the present invention, below the foundation pit dewatering degree of depth, the confirmed standard of first water barrier position is:
According to the size of aquifer hydraulic pressure, this position is guaranteed that aquifer water is prominent and is gushed by entering in water storage pipe well section without sandpipe well section.
Fig. 3 shows the realization flow of location, the well point pumping method that the embodiment of the present invention provides.
Location, a kind of well point pumping method, the method comprises:
In step S301, by the comprehensive transmission coefficient of the soil layer (or aquifer) between underground water level to water storage pipe well section top, aquifer thickness and drawdown determination well spacing;
In step s 302, certain position of the first water barrier 6 below the foundation pit dewatering degree of depth up adopts without sandpipe well section 1;
In step S303, certain position of the first water barrier 6 below the foundation pit dewatering degree of depth down adopts water storage pipe well section 2;
In step s 304, pumping equipment is utilized to determine the water source of water level extraction water storage pipe well section 2 storage.
In embodiments of the present invention, water storage pipe well section 2 for outside be coated with grout layer without sandpipe well section.
In embodiments of the present invention, sealing material layer is adopted to fill outside water storage pipe well section 2.
In embodiments of the present invention, the first water barrier position below the foundation pit dewatering degree of depth is gushed (by without sandpipe well section) principle entered in water storage pipe well section determine by being guaranteed this aquifer water seepage flow being not prominent;
In embodiments of the present invention, water storage pipe well section is formed by connecting by more piece standpipe, and tube coupling junction is provided with sealing collar pad;
In embodiments of the present invention, the outside without sandpipe well section 1 adopts graded sand to fill.
In embodiments of the present invention, the implementation method utilizing pumping equipment to determine the water source that water level extraction water storage pipe well section 2 stores is:
The duty of Simple automatic control device auto-controlled water-pumping pump can be adopted, realize suction pump and determine the water source that water level extracts the storage of water storage pipe well section 2.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
Location, well point pumping method, namely the comprehensive transmission coefficient of the soil layer (or aquifer) between underground water level to water storage pipe well section top, aquifer thickness and drawdown determination well spacing is pressed, certain position of first water barrier 6 below the foundation pit dewatering degree of depth up adopts without sandpipe well section 1 (also known as gravel filter pipe), down then adopt water storage pipe well section 2, be combined into precipitation pipe well.Adopt graded sand to fill without outside sandpipe well section 1, underground water is by graded sand, enter in pipe well without sandpipe.Water storage pipe well section 2 can adopt outside smear grout layer without sandpipe well section, sealing material is adopted to fill outside it, prevent the water in aquifer, bottom 4 to enter in precipitation pipe well, this section of pipe well in fact just becomes water storage storehouse, to store in aquifer, top 3 and the water penetrated in precipitation pipe well.The number of the Design of length Main Basis water yield of this section of water storage pipe well section 2 and the pumpage of pumping equipment, can ensure there is certain storage place downcomer space in waterproof well casing section for benchmark after once drawing water.
Because under " dredging and do not do " condition, later stage discharge is limited, one takes out i.e. nothing, does not take out and has, mainly a termination of pumping, caused by the water backflow in pump line.If the water of backflow occupies the space storing water pipe section substantially, then the underground water outside pipe well cannot enter in pipe well again, and the groundwater table of foundation ditch just cannot decline further, therefore cannot underground water in white-out foundation pit dewatering depth bounds.If water storage pipe well section 2 sections is too short, deduction termination of pumping water reflux behind the space that occupies, and seldom, then want stop and start pumping frequency numerous, not only take electricity but also consume pumping equipment, dewatering effect is poor in remaining space (being called the usefull space); If water storage pipe well section 2 sections is long, the usefull space becomes large, and the stop and start pump time interval is also large, favourable to drawing water, but deepens will bring pipe well cost to increase because of precipitation pipe well, and deep hole pore-forming is difficult, and the increase of expense.So, the length of appropriate design water storage pipe well section 2 sections.
The embodiment of the present invention is by adopting without sandpipe well section 1, the precipitation pipe well of water storage pipe well section 2 composition, effectively gather water source in the aquifer, top 3 at foundation ditch 5 place, pumping equipment (suction pump) is utilized to determine the water source of water level extraction water storage pipe well section 2 storage, solve water one in peupendicular hole and take out i.e. nothing, one stops and has, water is still had during excavation, make foundation ditch 5 scope of operation muddy, workman's constructional difficulties, affect construction speed, the infiltration of foundation ditch 5 sidewall makes slope retaining lose efficacy, produce quicksand phenomenon, in soil, fine grained moves in coarse granule gap with current, soil layer is emptied, cause Earth cave, cause foundation ditch 5 slippage, cave in, manpower and materials are caused to lose problem.Only extract the influential underground water of base pit engineering simultaneously, substantially reduce total time of drawing water, reduce engineering cost, and due to underground water in independent aquifer below underground water in aquifer, top and foundation ditch isolated, aquifer, contaminated top underground water can not pollute bottom groundwater quality.Today that this is day by day deficient in current water resource, water environment and water resource come into one's own day by day, there is obvious social benefit and economic benefit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a well point positioning water pumping tube well, is characterized in that, this pipe well comprises without sandpipe well section, water storage pipe well section:
Be positioned at more than the first water barrier position of below the foundation pit dewatering degree of depth, for gather water source in the aquifer in foundation pit dewatering depth bounds without sandpipe well section;
Below the first water barrier position being positioned at below the described foundation pit dewatering degree of depth, be connected without sandpipe well section with described, for storing the water storage pipe well section at water source in the aquifer in described foundation pit dewatering depth bounds;
It is tectal without sandpipe well section or steel tube well section or real wall cement pipe well section or adopt the real wall of thin cement mortar outer and without sandpipe internal layer two kinds of standpipes combined that described water storage pipe well section is that outside is coated with cement paste;
The outside of described water storage pipe well section is filled with sealing material layer;
The tube coupling junction of described water storage pipe well section is provided with sealing collar pad;
The confirmed standard of first water barrier position below the described foundation pit dewatering degree of depth is:
According to the size of aquifer hydraulic pressure, this position is guaranteed that aquifer water is prominent and is gushed by entering in water storage pipe well section without sandpipe well section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110224948.1A CN102383437B (en) | 2011-08-08 | 2011-08-08 | Well point positioned pumping tubular well and well point positioned pumping method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110224948.1A CN102383437B (en) | 2011-08-08 | 2011-08-08 | Well point positioned pumping tubular well and well point positioned pumping method |
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| Publication Number | Publication Date |
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| CN102383437A CN102383437A (en) | 2012-03-21 |
| CN102383437B true CN102383437B (en) | 2015-05-20 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005418A (en) * | 2014-06-17 | 2014-08-27 | 中铁城建集团第二工程有限公司 | Method for rapidly treating underground piping |
| CN105804104B (en) * | 2015-03-13 | 2017-08-15 | 河北建设集团卓诚路桥工程有限公司 | A kind of construction method of well-points dewatering |
| CN105735330B (en) * | 2015-03-13 | 2017-11-14 | 苏建林 | A kind of construction method of well-points dewatering |
| CN104831742B (en) * | 2015-04-15 | 2016-08-24 | 中国建筑第八工程局有限公司 | The Method on Dewatering of Foundation Pit that adjacent two layers low pressure water layer is not cut off by water barrier |
| CN105780793B (en) * | 2016-04-06 | 2017-07-04 | 中建交通建设集团有限公司 | A kind of high artesian stratum Foundation Pit Pouring emergency processing method |
| CN110847200B (en) * | 2019-11-14 | 2024-02-06 | 河南理工大学 | Dewatering and draining structure and dewatering and draining method for horizontal sand well of annular foundation pit |
| CN111719573A (en) * | 2020-06-23 | 2020-09-29 | 上海长凯岩土工程有限公司 | Foundation ditch emergency precipitation gas monitoring integral installation structure in huge thick rich water aquifer |
| CN114876411B (en) * | 2022-05-06 | 2023-10-24 | 陕西省水工环地质调查中心 | Anti-floating decompression layout mechanism and layout method for underground engineering curtain radiation well |
Family Cites Families (5)
| 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 |
| JP3567411B2 (en) * | 1997-03-19 | 2004-09-22 | 清水建設株式会社 | Pumping equipment |
| 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 |
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| CN102383437A (en) | 2012-03-21 |
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