CN205152969U - A precipitation tubular well structure for foundation ditch precipitation - Google Patents
A precipitation tubular well structure for foundation ditch precipitation Download PDFInfo
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- CN205152969U CN205152969U CN201520925393.7U CN201520925393U CN205152969U CN 205152969 U CN205152969 U CN 205152969U CN 201520925393 U CN201520925393 U CN 201520925393U CN 205152969 U CN205152969 U CN 205152969U
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- well
- precipitation
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- pipe
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Abstract
The utility model belongs to the technical field of foundation ditch precipitation construction technology and specifically relates to relate to well point dewatering technical field, specifically disclose a precipitation tubular well structure for foundation ditch precipitation, its characterized in that: the downcomer well location is in the foundation ditch, and the precipitation tubular well includes well casing that lies in the vertical precipitation well and the well seat of laminating with the well casing, and the well casing is no sand cement pipe, and the well seat is concrete well seat, and the well seat is the bottom in the precipitation well, and the well casing lies in well seat top, and the well casing is the multisection, along precipitation well connection in proper order, the well casing is interior, well seat top is equipped with silt matter clay layer, boulder bed in proper order. The utility model discloses simple structure, can the effective control in the tubular well sand output, especially control valve shaft bottom portion shake out, prevent the tubular well bottom sand output be too big to lead to the fact the influence to tubular well precipitation.
Description
Technical field
The utility model relates to foundation pit dewatering technical field of construction, especially relates to well-points dewatering technical field.
Background technology
At thick-layer sand and powder land floor, when the excavation of foundation pit degree of depth is positioned at below groundwater table absolute altitude, foundation pit dewatering must be carried out.General precipitation method is hole peripheral hardware well, encloses to fall control groundwater table as adopted light well point method formation of drawing water.But take the method that well-points dewatering is set in proposed building periphery to be difficult to ensure to be reduced to by the water level at most deep location (elevator shaft and the sump) place in basement 500mm under its foundation pad absolute altitude due to the reason of geological condition and groundwater seepage coefficient.
In prior art foundation ditch, to control pipe well difficulty of shaking out at thick-layer sand and powder land floor large for tube well dewatering, and in well water, sand content exceeds standard, easily chimney filter in blocking pipe well, causes water pump in pipe well to damage, impacts drainage works.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of precipitation pipe well for foundation pit dewatering and constructs, structure is simple, can effectively control sand production rate in pipe well, especially control valve bottom is shaked out, and prevents that sand production rate bottom pipe well is excessive to be impacted tube well dewatering.
For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of precipitation pipe well for foundation pit dewatering constructs, downcomer well location is in foundation ditch, described precipitation pipe well comprises the well casing being positioned at vertical pumping well and the well seat of fitting with described well casing, and described well casing is sand-free concrete tube, and described well seat is concrete well seat, described well seat is positioned at dewatering well inner bottom part, described well casing is positioned at above well seat, and described well casing is more piece, is linked in sequence successively along dewatering well; In described well casing, above well seat, be provided with silt matter argillic horizon, boulder bed successively.
Further, described well seat upper surface is taper, and described silt matter argillic horizon soffit and well seat upper surface are fitted, and described silt matter argillic horizon upper surface is plane.
Preferably, described well casing is positioned at below earth's surface 0 ~ 2m part for real pipe, and below 2m is filter pipe, and described filter pipe porosity is greater than 30%.
Further, the coated non-woven fabrics of described well casing outer wall, fills out between described non-woven fabrics and the precipitation borehole wall and is provided with filter material layer, and in described filter material layer, the particle diameter of filtrate is greater than described filter pipe aperture.
The beneficial effect adopting technique scheme to produce is: the utility model can effectively control sand production rate in pipe well, especially silt matter argillic horizon, boulder bed is provided with above concrete well seat successively, good water permeability and sandwich construction can effective control valve bottom sand production rates, prevent that sand production rate bottom pipe well is excessive to be impacted tube well dewatering, there is structure advantage that is simple, that easily implement.Concrete well seat can protect silt matter argillic horizon, the boulder bed of top, avoids silt matter argillic horizon, boulder bed to cause by strong water impact destruction and shakes out.
Accompanying drawing explanation
Fig. 1 is the planing surface structural representation of the utility model embodiment;
Fig. 2 is the structural representation of well seat in Fig. 1.
Wherein, 1, filter material layer; 2, well casing; 3, boulder bed; 4, silt matter argillic horizon; 5, well seat.
Detailed description of the invention
In order to clearly the utility model can be described, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
A kind of precipitation pipe well for foundation pit dewatering constructs, see Fig. 1, downcomer well location is in foundation ditch, precipitation pipe well comprises the well casing 2 being positioned at vertical pumping well and the well seat 5 of fitting with well casing 2, and well casing 2 is sand-free concrete tube, and well seat 5 is concrete well seat 5, well seat 5 is positioned at dewatering well inner bottom part, well casing 2 is positioned at above well seat 5, and well casing 2 is more piece, is linked in sequence successively along dewatering well; In well casing 2, above well seat 5, be provided with silt matter argillic horizon 4, boulder bed 3 successively.
To the further improvement of the technical program, well seat 5 upper surface is taper, sees Fig. 2, and silt matter argillic horizon 4 soffit and well seat 5 upper surface are fitted, and silt matter argillic horizon 4 upper surface is plane.
To the further improvement of the technical program, well casing 2 is positioned at below earth's surface 0 ~ 2m part for real pipe, and below 2m is filter pipe, and filter pipe porosity is greater than 30%.
To the further improvement of the technical program, the coated non-woven fabrics of well casing 2 outer wall, fill out between non-woven fabrics and the precipitation borehole wall and be provided with filter material layer 1, in filter material layer 1, the particle diameter of filtrate is greater than filter pipe aperture.
Adopt light well point method to carry out dewatering construction to proposed building basement elevator shaft, sump, its precipitation pipe well structure adopts the utility model to construct for the precipitation pipe well of foundation pit dewatering.
1, pit earthwork excavation
Carry out pit earthwork excavation, dig to the above 500mm of basement substrate absolute altitude.
2, location, well point
Conscientiously check and be not less than 3000mm with the position relationship of CFG stake (CFG) apart from stake limit, prevent string hole and cement paste from entering in dewatering well; According to construction drawing, release position, well point with total powerstation.
3, tube well construction
1) dig mud sump, dig a 5000*5000*1500mm mud sump on side, each well location hole.Lay Polypropylence Sheet in mud sump, prevent mud from destroying foundation ditch original soil layer, each mud sump is transported outward with special mud car after pipe well has been beaten.
2) driller insertion pore-forming
Select GZ-1000 type rig, adopt mud off formula pore-forming (mixing expansive soil), during pore-forming, ensure that hole wall is vertical.Dewatering well aperture is ф 600, well depth 20m.
3) well casing 2 is laid
According to Design Requirement Drawing, sand-free concrete tube is adopted to do well casing 2, when laying concrete well seat 5, well casing 2, well seat 5 upper surface is taper, descend most joint well casing 2 and well seat 5 to fit, well casing 2 will vertically, section by section sink to, and pipe top is than natural ground height 500mm simultaneously.0 ~ 2m below dewatering well earth's surface is real pipe, and 2 ~ 10.5m is filter pipe (porosity is greater than 30%).
4) filtrate is inserted
After well casing enters for 2 times, between well casing 2 and hole wall, the aperture that should be greater than filter screen through washing 2 ~ 3 times mineral granule particle diameter of filter medium is inserted in layering in time.
5) silt matter clay and cobble is inserted
In order to prevent, shaft bottom sand production rate is excessive inserts each 200mm height silt matter clay and cobble drainage layer, sand production rate at the bottom of control well after completing filtrate in well, and silt matter argillic horizon 4 soffit and well seat 5 upper surface are fitted, and silt matter argillic horizon 4 upper surface is plane.
6) well-flushing
In lower completion tubular 2, fill in filtrate, seal in latter 8 hours, clean well with foul water pump, unimpeded to guarantee the permeation pathway of water.
Application the utility model can effectively control sand production rate in pipe well, and especially control valve bottom is shaked out, and prevents that sand production rate bottom pipe well is excessive to be impacted tube well dewatering, has structure advantage that is simple, that easily implement.
Claims (4)
1. the precipitation pipe well for foundation pit dewatering constructs, it is characterized in that: downcomer well location is in foundation ditch, described precipitation pipe well comprises the well casing (2) being positioned at vertical pumping well and the well seat (5) of fitting with described well casing (2), described well casing (2) is sand-free concrete tube, described well seat (5) is concrete well seat (5), described well seat (5) is positioned at dewatering well inner bottom part, described well casing (2) is positioned at well seat (5) top, described well casing (2) is more piece, is linked in sequence successively along dewatering well; In described well casing (2), above well seat (5), be provided with silt matter argillic horizon (4), boulder bed (3) successively.
2. a kind of precipitation pipe well for foundation pit dewatering according to claim 1 constructs, it is characterized in that, described well seat (5) upper surface is taper, and described silt matter argillic horizon (4) soffit and well seat (5) upper surface are fitted, and described silt matter argillic horizon (4) upper surface is plane.
3. a kind of precipitation pipe well for foundation pit dewatering according to claim 1 constructs, and it is characterized in that, described well casing (2) is positioned at below earth's surface 0 ~ 2m part for real pipe, and below 2m is filter pipe, and described filter pipe porosity is greater than 30%.
4. a kind of precipitation pipe well for foundation pit dewatering according to claim 3 constructs, it is characterized in that, the coated non-woven fabrics of described well casing (2) outer wall, fill out between described non-woven fabrics and the precipitation borehole wall and be provided with filter material layer (1), the particle diameter of described filter material layer (1) interior filtrate is greater than described filter pipe aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520925393.7U CN205152969U (en) | 2015-11-19 | 2015-11-19 | A precipitation tubular well structure for foundation ditch precipitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520925393.7U CN205152969U (en) | 2015-11-19 | 2015-11-19 | A precipitation tubular well structure for foundation ditch precipitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205152969U true CN205152969U (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520925393.7U Expired - Fee Related CN205152969U (en) | 2015-11-19 | 2015-11-19 | A precipitation tubular well structure for foundation ditch precipitation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836249A (en) * | 2016-12-23 | 2017-06-13 | 浙江省送变电工程公司 | Small deep-well precipitation method in power network overhead transmission line foundation construction |
| CN108867651A (en) * | 2018-07-26 | 2018-11-23 | 江苏兴厦建设工程集团有限公司 | A kind of pervious concrete well casing mounting device for base pit dewatering |
| CN111456054A (en) * | 2020-04-14 | 2020-07-28 | 山东大学 | Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method |
| CN113605427A (en) * | 2021-07-30 | 2021-11-05 | 中国十七冶集团有限公司 | Precipitation construction method for foundation pit with superfine sandy soil near lake |
| CN108867651B (en) * | 2018-07-26 | 2024-07-05 | 常州工程职业技术学院 | Water permeable concrete well pipe installation device for foundation pit dewatering |
-
2015
- 2015-11-19 CN CN201520925393.7U patent/CN205152969U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836249A (en) * | 2016-12-23 | 2017-06-13 | 浙江省送变电工程公司 | Small deep-well precipitation method in power network overhead transmission line foundation construction |
| CN108867651A (en) * | 2018-07-26 | 2018-11-23 | 江苏兴厦建设工程集团有限公司 | A kind of pervious concrete well casing mounting device for base pit dewatering |
| CN108867651B (en) * | 2018-07-26 | 2024-07-05 | 常州工程职业技术学院 | Water permeable concrete well pipe installation device for foundation pit dewatering |
| CN111456054A (en) * | 2020-04-14 | 2020-07-28 | 山东大学 | Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method |
| CN111456054B (en) * | 2020-04-14 | 2021-04-30 | 山东大学 | Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method |
| CN113605427A (en) * | 2021-07-30 | 2021-11-05 | 中国十七冶集团有限公司 | Precipitation construction method for foundation pit with superfine sandy soil near lake |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20161119 |