CN203066092U - Pumping and recharging dual-purpose well casing - Google Patents
Pumping and recharging dual-purpose well casing Download PDFInfo
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- CN203066092U CN203066092U CN 201220698161 CN201220698161U CN203066092U CN 203066092 U CN203066092 U CN 203066092U CN 201220698161 CN201220698161 CN 201220698161 CN 201220698161 U CN201220698161 U CN 201220698161U CN 203066092 U CN203066092 U CN 203066092U
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Abstract
The utility model discloses a pumping and recharging dual-purpose well casing. The water pumping and recharging dual-purpose well casing comprises a pumping well and a recharging well which are arranged on the same position of a wellhole. A watering pipe of the recharging well is fixed in the well casing of a dewatering well. The upper end of the watering pipe of the recharging well is level with the upper end of the well casing of the dewatering well. On the basis of the features of a seepage field in the process that foundation pit dewatering is carried out in a deep aquifer, the dewatering well casing is vertically lengthened to a water supply position of the aquifer, and a well casing recharging and filtering section is arranged at the water supply position. A recharging channel is arranged in the dewatering well to recharge water which is pumped out and then is subjected to sediment and clarification to the recharging and filtering section. Consequently, the supplementary amount of the aquifer from the outside of a foundation pit to the inside of the foundation pit is reduced, and land subsidence is also reduced. The pumping and recharging dual-purpose well casing integrates the dewatering technology and the recharging technology, enables one well to have two purposes through improvement of the well casing, has the pumping and recharging functions, has the advantages of being simple and convenient to construct, low in manufacturing cost, efficient in recharging and good in subsidence control effects, and has great popularization and application value.
Description
Technical field
The utility model relates to a kind of precipitation device, relate in particular to a kind of Land-Subsidence Control device that in a well casing, draws water simultaneously and recharge, be applicable to the situation of in the stratum of deep aquifer or the distribution of aquifer stratification, carrying out precipitation and needing control surface settlement, can be mainly used in the base pit engineering field, other is as construction of tunnel field, foundation treatment engineering field etc.
Background technology
Along with construction work develops to " building height height, basic embedding dark " both direction, the underground engineering construction degree of depth such as base pit engineering increase day by day, often relate to underground deep aquifer or multi-layered aquifer, foundation pit dewatering project can extract a large amount of underground water deeply, greatly, cause engineering problems such as surface settlement, groundwater resources waste, so need take rational engineering measure to avoid bad engineering consequence to take place, draw water simultaneously in a kind of well casing of the present utility model and the subsidence control method that recharges namely is a kind of like this engineering measure.
When in deep aquifer, carrying out foundation pit dewatering, in order to reduce foundation ditch water yield and control surface settlement, often water-stop curtain is deepened, construction technology can make that water-stop curtain is the darkest to reach about 55m at present, then becomes the suspension type water-stop curtain when water-stop curtain can not block the aquifer.Precipitation in the suspension type water-stop curtain, the feature of seepage field is the top, current direction aquifer at bottom, aquifer or middle part, be at the bottom of the foundation ditch in the well casing precipitation from from bottom to top water supply supply in the aquifer, the aquifer obtains the outer aquifer water supply supply of foundation ditch again in the foundation ditch or near the foundation ditch, forms from outside to inside, seepage field percolation path from bottom to top.If can be in the bottom, aquifer or the middle part recharge well is set so that water recharging to be provided, can reduce the supply of the outer aquifer of foundation ditch in the foundation ditch, just can reach and reduce the purpose of cheating the sedimentation of outer ground.
Tube well dewatering is a kind of dewatering construction technology of maturation, and the precipitation well casing comprises sealing section, drainage section and precipitating phase three parts.Earlier put well bore by rig at well location during construction, wellhole is descended well casing after getting into desired depth, fills out filtrate, clay ball in the space between well casing and hole wall, can descend pump to draw water after the well-flushing.When filling out filtrate, clay ball, filtrate is filled out drainage section and precipitating phase position, clay ball is filled out the sealing fragment position.The construction technology that pipe well recharges is almost completely identical with tube well dewatering, and difference is that precipitation well drainage section act as the aquifer and seeps water in well, and recharge well drainage section act as the interior recharge water of well and seeps water to the aquifer.
In order to guarantee the recharge water quality in case recharge silting, the water that needs to extract out from the aquifer remakes the usefulness of recharging after the precipitation clarification in sedimentation basin.
Summary of the invention
The utility model provides a kind of and draws water and recharge dual-purpose well casing for solving the technical problem that exists in the known technology, and this well casing can reduce the aquifer by increment in the export-oriented foundation ditch of foundation ditch, reduces surface settlement, the protection groundwater resources.
The utility model for the technical scheme that solves the technical problem that exists in the known technology and take is: a kind ofly draw water and recharge dual-purpose well casing, comprise the pumped well and the recharge well that are arranged on the same wellhole position, the irrigation pipe of described recharge well is fixed in the well casing of precipitation well, and the irrigation pipe of described recharge well upper end is concordant with the well casing upper end of described precipitation well.
The diameter of the well casing of described recharge well is less than the diameter of the well casing of described precipitation well, and the irrigation pipe diameter of described recharge well is identical with the well casing diameter of recharge well, and the irrigation pipe of described recharge well and the well casing of described recharge well are affixed mutually.
The diameter of the well casing of described recharge well is identical with the diameter of the well casing of described precipitation well, and the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the drainage section upper end of described recharge well.
The diameter of the well casing of described recharge well is identical with the diameter of the well casing of described precipitation well, and the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the sealing section upper end of described recharge well.
Advantage and the good effect that the utlity model has are: based on the seepage field characteristics of foundation pit dewatering in the deep aquifer, the precipitation well casing is vertically extended to the water supply supply position in aquifer, in this position well casing is set and recharges the drainage section, in the precipitation well, arrange and recharge the water that passage goes extraction and after the precipitation clarification, recharge to recharging the drainage section, reduce the aquifer by increment in the export-oriented foundation ditch of foundation ditch, reduce surface settlement.The utility model is with precipitation and recharge two kinds of technology and integrate, and transforms well casing, makes a well dual-purpose, has simultaneously to draw water and recharge function, have easy construction, cheap, recharge efficient, the good advantage of control effect of settling, have application value.
Description of drawings
Fig. 1 is the vertical view of first kind of structure of the utility model;
Fig. 2 is the lateral view of first kind of structure of the utility model;
Fig. 3 is the sectional drawing of Fig. 1;
Fig. 4 is the vertical view of second kind of structure of the utility model;
Fig. 5 is the lateral view of second kind of structure of the utility model;
Fig. 6 is the sectional drawing of Fig. 4;
Fig. 7 is the vertical view of the third structure of the utility model;
Fig. 8 is the lateral view of the third structure of the utility model;
Fig. 9 is the sectional drawing of Fig. 7;
The schematic diagram that Figure 10 uses for the utility model.
Among the figure: 1, the sealing section of pumped well, 2, the drainage section of pumped well, 3, the precipitating phase of pumped well, 4, the sealing section of recharge well, 5, the drainage section of recharge well, 6, the precipitating phase of recharge well, 7, well casing, 8, irrigation pipe, 9, iron plate is supported in welding, and 10, foundation ditch, 11, water-stop curtain, 12, aquifer, 13, draw water and recharge dual-purpose well casing.
The specific embodiment
For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1～Figure 10, a kind ofly draw water and recharge dual-purpose well casing, comprise the pumped well and the recharge well that are arranged on the same wellhole position, the irrigation pipe 8 of described recharge well is fixed in the well casing of precipitation well, and irrigation pipe 8 upper ends of described recharge well are concordant with the well casing of described precipitation well upper end.
The above-mentioned job practices of drawing water and recharging dual-purpose well casing may further comprise the steps:
One) according to the degree of depth of foundation ditch 10, the degree of depth of water-stop curtain 11 and the distribution situation in aquifer 12, analyzes the position of the drainage section 6 of the position determine the drainage section 2 of pumped well on same wellhole position and recharge well;
Two) sealing section 1, drainage section 2 and the precipitating phase 3 of pumped well determined in design, and sealing section 4, drainage section 5 and the precipitating phase 6 of recharge well determined in design;
Three) according to the well casing structure, determine wellhole bore diameter and the degree of depth;
Four) adopt drill drilling hole depth location at the bottom of the well casing pipe;
Five) finish the construction of recharge well and precipitation well in same wellhole position, formation is drawn water and is recharged dual-purpose well casing 13, the irrigation pipe 8 of recharge well supports iron plate 9 by welding and is fixed in the well casing 7 of precipitation well, and irrigation pipe 8 upper ends of recharge well are concordant with well casing 7 upper ends of precipitation well.
See also Fig. 1～Fig. 3, Fig. 1～Fig. 3 shows above-mentioned first kind of structure of drawing water and recharging dual-purpose well casing, the diameter of the well casing of described recharge well is less than the diameter of the well casing of described precipitation well, the diameter of the irrigation pipe 8 of described recharge well is identical with the well casing diameter of recharge well, and the irrigation pipe 8 of described recharge well is affixed mutually with the well casing of described recharge well.
See also Fig. 4～Fig. 6, Fig. 4～Fig. 6 shows above-mentioned second kind of structure of drawing water and recharging dual-purpose well casing, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described precipitation well, the diameter of the irrigation pipe 8 of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe 8 of described recharge well extends to the drainage section upper end of described recharge well.
See also Fig. 7～Fig. 9, Fig. 7～Fig. 9 shows above-mentioned the third structure of drawing water and recharging dual-purpose well casing, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described precipitation well, the diameter of the irrigation pipe 8 of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe 8 of described recharge well extends to the sealing section upper end of described recharge well.
The concrete operation of Cheng Jing is:
(a) place well casing in prefabricated shaft bottom, slowly transfer, when the mouth of pipe and well head differ 200mm, connect the joint well casing.Hang well casing and want vertical, and remain on the wellhole center, flow in the well for preventing rainwater silt particle or foreign matter, the well casing 200mm that is not less than above ground level, and add a cover temporary protection.Well casing drainage section adopts the iron pipe of sand concrete free chimney filter or band filter opening, and the non-filter pipe of well casing adopts the sand concrete free chimney filter or not with the iron pipe of filter opening.
(b) insert filtrate and clay ball after well casing is lowered to immediately.Filtrate is inserted drainage section and precipitating phase position, and clay ball is inserted the sealing fragment position.Filtrate and clay ball are evenly inserted around wellhole, should keep continuously mud being extruded wellhole.When filling out filtrate and clay ball, insert height with filling out with surveying filtrate and clay ball, when the amount of inserting and theoretical amount of calculation are inconsistent, in time search reason and mend and fill out or change and fill out.
(c) should carry out well-flushing immediately after filling out filtrate and clay ball, in order to avoid overlong time, retaining wall mud skin is aging gradually, is difficult to destroy influence infiltration and irrigation effect.During flushing, adopt pump examination down to take out well-flushing, take out repeatedly with submersible pump and wash, clean until the water sand removal.
After this, draw water, the current that draw water are placed in the external sedimentation basin.After treating the interior clarification of water of sedimentation basin, clear water is extracted the pipe that recharges that pours in the well casing with water pump.
The utility model is at the seepage field characteristics of foundation pit dewatering in the deep aquifer; in the precipitation location arrangements drainage section of drawing water; the drainage section is recharged in setting in the moisturizing position; precipitation is finished with recharging in a well casing; easy construction, cheap, recharge efficiently, play the purpose of control surface settlement and protection of groundwater resource.
Basic principle of the present utility model is: precipitation in the suspension type water-stop curtain, the feature of seepage field is the top, current direction aquifer at bottom, aquifer or middle part, be at the bottom of the foundation ditch in the well casing precipitation from from bottom to top water supply supply in the aquifer, the aquifer obtains the outer aquifer water supply supply of foundation ditch again in the foundation ditch or near the foundation ditch, forms from outside to inside, seepage field percolation path from bottom to top.Based on such seepage field characteristics, the precipitation well casing is vertically extended to the water supply supply position in aquifer, in this position well casing is set and recharges the drainage section, namely in the precipitation location arrangements drainage section of drawing water, arrange in the moisturizing position and to recharge the drainage section.In the precipitation well, arrange and recharge the water that passage goes extraction and after the precipitation clarification, recharge to recharging the drainage section, with precipitation with recharge in a well casing and finish, reduce the aquifer by increment in the export-oriented foundation ditch of foundation ditch, reduce surface settlement.
The utility model is based on the seepage field feature of foundation pit dewatering; integrate existing ripe precipitation well technology and recharge well technology; recharge passage by setting in the precipitation well and make the unification of two wells; not only can reduce surface settlement but also can protect groundwater resources, simultaneously this technology have easy construction, cheap, recharge advantage efficiently.
Application example 1 of the present utility model:
See also Figure 10, the rectangular long 160m of certain subway station pit engineering, wide 22.1m takes cut and cover tunneling, and supporting and protection structure is diaphragm wall and interior support, and foundation ditch digs dark 25.63m.Diaphragm wall double as water-stop curtain, wall thickness 1m, the dark 45m of wall.Artesian aquifer top board buried depth is 30m, and moisture bed thickness reaches 21m.Foundation pit dewatering well drainage section enters artesian aquifer, and water-stop curtain does not block artesian aquifer, adopts conventional precipitation method can cause artesian aquifer to draw water in a large number and is difficult to control with surface settlement.Adopt the utility model method that surface settlement is effectively controlled.
According to computational analysis, determine the well casing long 35m of part that draws water, be that sealing section, 134m are precipitating phase for the drainage section of drawing water, 34～35m from the downward 01m of the mouth of pipe wherein; The long 20m of part that determines to pour water, from the downward 3543m of the mouth of pipe be sealing section, 4354m for recharge the drainage section, 5455m is precipitating phase.Draw water well casing diameter and irrigation pipe diameter all is 273mm, and length is 55m.The tube channel of pouring water diameter is 100mm, and length is 35m, and the tube channel of pouring water weldering is attached on the well tubular wall.The well casing bore diameter is 600mm.Boring is 55m deeply.
The interior layout altogether of foundation ditch is drawn water and is recharged totally 20 mouthfuls of dual-purpose well casings, and foundation ditch arranges 4 sedimentation basins outward, and per 5 mouthfuls of wells share a sedimentation basin.Place a suction pump in each well casing, the water of extraction enters sedimentation basin, and the water in the sedimentation basin after the clarification is smoked the tube channel of pouring water that is circulated in the well casing by water pump again, and then recharges into the aquifer.
Through field monitoring, about 3/4 foundation ditch water yield recharges into underground reservoir, precipitation 6 months, and Land-Subsidence Control has reached the engineering Expected Results in 15mm.
Application example 2 of the present utility model:
About 10,000 m of certain mansion base pit engineering excavation area
2, the about 14.2m of cutting depth, foundation pit supporting project adopt twice temporary steel reinforced concrete horizontal supporting system; Water-stop curtain is 650,900 3 cement mixing piles of single Φ, the long 23m of stake; Take cut and cover tunneling.Cover artesian aquifer under the foundation ditch, its layer top buried depth is about 30.5m, and about the thickness 33m of aquifer, the artesian water depth to water is about 1.50～1.90m, does not satisfy the anti-prominent stable checking computations of gushing, and needs to arrange pressure reduction well in the engineering.Adopt conventional precipitation method can cause artesian aquifer to draw water in a large number and surface settlement is difficult to control, adopting the utility model method that pressure reduction well is made becomes step-down and recharges dual-purpose well casing, and step-down and recharge simultaneously and carry out is effectively controlled surface settlement.
According to computational analysis, determine that step-down recharges the dual-purpose well casing long 38m of part that draws water, be that sealing section, 3137m are precipitating phase for the drainage section of drawing water, 3738m from the downward 031m of the mouth of pipe wherein; Determine that step-down recharges the dual-purpose well casing long 16m of part that pours water, from the downward 3843m of the mouth of pipe be sealing section, 4353m for recharge the drainage section, 5354m is precipitating phase.Draw water well casing diameter and irrigation pipe diameter all is 273mm, and length is 54m.The tube channel of pouring water diameter is 100mm, and length is 43m, and the tube channel of pouring water weldering is attached on the well tubular wall.The well casing bore diameter is 600mm.Boring is 54m deeply.
The step-down well casing is only drawn water and recharges dual-purpose well casing as of the present utility model in the foundation ditch, arrange altogether and draw water and recharge totally 28 mouthfuls of dual-purpose well casings that foundation ditch arranges 7 sedimentation basins outward, per 4 mouthfuls of wells share a sedimentation basin.Place a suction pump in each well casing, the water of extraction enters sedimentation basin, and the water in the sedimentation basin after the clarification is smoked the tube channel of pouring water that is circulated in the well casing by water pump again, and then recharges into artesian aquifer.
Through field monitoring, about 1/2 step-down pump-out is recharged into underground reservoir, step-down 3 months, and Land-Subsidence Control has reached the engineering Expected Results in 20mm.
Although by reference to the accompanying drawings preferred embodiment of the present utility model is described above; but the utility model is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away under the scope situation that the utility model aim and claim protect, can also make a lot of forms, these all belong within the protection domain of the present utility model.
Claims (4)
1. one kind is drawn water and recharges dual-purpose well casing, it is characterized in that, comprise the pumped well and the recharge well that are arranged on the same wellhole position, the irrigation pipe of described recharge well is fixed in the well casing of precipitation well, and the irrigation pipe of described recharge well upper end is concordant with the well casing upper end of described precipitation well.
2. according to claim 1ly draw water and recharge dual-purpose well casing, it is characterized in that, the diameter of the well casing of described recharge well is less than the diameter of the well casing of described precipitation well, the irrigation pipe diameter of described recharge well is identical with the well casing diameter of recharge well, and the irrigation pipe of described recharge well and the well casing of described recharge well are affixed mutually.
3. according to claim 1ly draw water and recharge dual-purpose well casing, it is characterized in that, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described precipitation well, the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the drainage section upper end of described recharge well.
4. according to claim 1ly draw water and recharge dual-purpose well casing, it is characterized in that, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described precipitation well, the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the sealing section upper end of described recharge well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220698161 CN203066092U (en) | 2012-12-15 | 2012-12-15 | Pumping and recharging dual-purpose well casing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220698161 CN203066092U (en) | 2012-12-15 | 2012-12-15 | Pumping and recharging dual-purpose well casing |
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| CN203066092U true CN203066092U (en) | 2013-07-17 |
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| CN 201220698161 Expired - Fee Related CN203066092U (en) | 2012-12-15 | 2012-12-15 | Pumping and recharging dual-purpose well casing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235422A (en) * | 2014-09-12 | 2014-12-24 | 山东省水利科学研究院 | Underground same-water-pipe water pumping and recharge dual-purpose valve |
| CN115305901A (en) * | 2022-08-16 | 2022-11-08 | 中交第四公路工程局有限公司 | Directional recharge and emergency pumping well |
-
2012
- 2012-12-15 CN CN 201220698161 patent/CN203066092U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235422A (en) * | 2014-09-12 | 2014-12-24 | 山东省水利科学研究院 | Underground same-water-pipe water pumping and recharge dual-purpose valve |
| CN115305901A (en) * | 2022-08-16 | 2022-11-08 | 中交第四公路工程局有限公司 | Directional recharge and emergency pumping well |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20141215 |
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| EXPY | Termination of patent right or utility model |