CN212001207U - Foundation ditch stagnant water precipitation's structure - Google Patents
Foundation ditch stagnant water precipitation's structure Download PDFInfo
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- CN212001207U CN212001207U CN202020111791.6U CN202020111791U CN212001207U CN 212001207 U CN212001207 U CN 212001207U CN 202020111791 U CN202020111791 U CN 202020111791U CN 212001207 U CN212001207 U CN 212001207U
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Abstract
The utility model provides a structure for water stop and precipitation of a foundation pit, which is used for water reduction and drainage of the foundation pit, and applicable strata comprise a diving aquifer, a first water barrier, a confined aquifer and a second water barrier; the structure comprises a falling bottom type waterproof curtain and a confined water precipitation well; a bottom-falling type waterproof curtain with the periphery closed is arranged in the foundation pit, and the bottom end of the bottom-falling type waterproof curtain penetrates through the diving aquifer, the first water-resisting layer and the confined aquifer and enters the second water-resisting layer; a plurality of pressure-bearing precipitation wells are arranged in the area surrounded by the falling-bottom type waterproof curtain; the confined water precipitation well is from last to being real pipe, filter tube and sedimentation tube down in proper order, the immersible pump is located the interior confined water that is used for taking out in the foundation ditch of filter tube. The utility model has the advantages that: the method realizes precipitation according to requirements, reduces the adverse effect of the foundation pit precipitation on surrounding buildings, reduces the risk of infiltration damage such as sudden surge and soil flow, and achieves the purposes of saving construction period, saving construction cost and ensuring the safety of foundation pit construction.
Description
Technical Field
The utility model relates to a foundation ditch stagnant water precipitation technical field especially relates to a structure of foundation ditch stagnant water precipitation.
Background
With the rapid development of economic technology in China, the construction of basic facilities such as various large commercial complexes, high-rise residences, comprehensive pipe galleries and the like emerges like bamboo shoots in the spring after rain, the development of underground spaces is developed and utilized before, and the foundation pit supporting engineering is used as an important underground structure, so that the difficulties and the challenges are increased. The groundwater is used as a key factor influencing the stability of the foundation pit, how to reduce the groundwater level quickly and safely, guarantee is provided for the stability of foundation pit excavation and supporting structures, and the groundwater is a problem which is a key concern of engineers. One of the main existence forms of confined water as groundwater, security to the engineering, economic nature etc. have important influence, foundation ditch excavation precipitation can produce adverse effect to the surrounding environment, adopt traditional suspension type waterproof curtain to combine the method of single precipitation well, hardly accomplish quick effective precipitation and guarantee the safety of peripheral building (structure) simultaneously again, in case the precipitation scheme is unreasonable, lead to precipitation can't reach the design requirement, will cause huge influence to the safety and the stability of engineering, consequently, it has important meaning to provide a foundation ditch stagnant water precipitation structure.
Disclosure of Invention
In order to solve the problems, the utility model provides a structure for water stop and precipitation of a foundation pit, which is used for water reduction and drainage of the foundation pit, and applicable strata comprise a diving aquifer, a first water-resisting layer, a bearing aquifer and a second water-resisting layer; the diving aquifer is a soil layer containing diving, the confined aquifer is a soil layer containing confined water, and the first waterproof layer and the second waterproof layer are impervious soil layers; the diving aquifer is positioned above a first water-resisting layer, the first water-resisting layer is positioned above the confined aquifer, and the confined aquifer is positioned above the second water-resisting layer; the bottom of the foundation pit is positioned in the first waterproof layer or the pressure-bearing water-containing layer; the structure includes: a bottom-falling type waterproof curtain and a confined water precipitation well;
a bottom-falling type waterproof curtain with the periphery closed is arranged in the foundation pit, and the bottom end of the bottom-falling type waterproof curtain penetrates through the diving aquifer, the first water-resisting layer and the confined aquifer and enters the second water-resisting layer;
a plurality of pressure-bearing precipitation wells are arranged in the area surrounded by the falling-bottom type waterproof curtain; the confined water precipitation well is from last to being real pipe, filter tube and sedimentation tube down in proper order, the immersible pump is located the filter tube for take out the confined water in the foundation ditch.
Further, the bottom-falling waterproof curtain is a cement-soil mixing wall with equal thickness, an underground continuous wall or a bored cast-in-place pile.
Further, the pressure-bearing precipitation well comprises a pipe well adopting a pipe well point precipitation method, a pipe well adopting a jet well point precipitation method and a pipe well adopting a vacuum well point precipitation method.
Further, the pump capacity of the submersible pump is 50-80 m 3/h.
Further, the filter pipe is located in the confined aquifer.
Furthermore, a water meter and a water stop valve are arranged above the pressure-bearing precipitation well, and the water meter is used for monitoring the amount of pressure-bearing water discharged from the pressure-bearing precipitation well; the water stop valve is used for preventing high-pressure water from reversely flowing back into the submersible pump to damage the submersible pump; the water meter and the water stop valve are connected with the submersible pump through a water pipe.
The utility model provides a beneficial effect that technical scheme brought is:
1. for foundation pit water stop and precipitation with a small amount of water in a submerged aquifer and rich in confined water, the confined water precipitation well is arranged, so that the level of the confined water in the foundation pit is effectively reduced, the risk of osmotic damage such as gushing and soil flowing is reduced, the construction period is shortened, and the safety of foundation pit construction is guaranteed.
2. The closed bottom-falling type waterproof curtain is arranged around the foundation pit, so that hydraulic connection inside and outside the foundation pit is effectively isolated, the underground water level outside the foundation pit is guaranteed not to change due to precipitation in the foundation pit, and the purpose of protecting buildings (structures) around the foundation pit is further achieved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic plan view of a structure for stopping water and lowering water in a foundation pit according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of the foundation pit bottom on the water-resisting layer in the embodiment of the present invention;
FIG. 3 is a schematic sectional view of an embodiment of the present invention, in which the bottom of a foundation pit is located in a confined aquifer;
FIG. 4 is a schematic sectional view of a confined water precipitation well according to an embodiment of the present invention;
fig. 5 is a schematic diagram of relevant parameters in anti-surge stability calculation according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An embodiment of the utility model provides a structure of foundation ditch stagnant water dewatering for the foundation ditch dewatering water, be applicable to the higher and foundation ditch periphery of pressure-bearing water level and have the foundation ditch dewatering stagnant water that needs key protection building (structure).
Referring to fig. 1 to 5, fig. 1 is a schematic plan view of a structure of water-stopping and water-lowering for a foundation pit in an embodiment of the present invention, fig. 2 is a schematic sectional view of a foundation pit bottom located on a water-resisting layer in an embodiment of the present invention, fig. 3 is a schematic sectional view of a foundation pit bottom located on a confined water-bearing layer in an embodiment of the present invention, fig. 4 is a schematic sectional view of a confined water-lowering well in an embodiment of the present invention, and fig. 5 is a schematic sectional view of a relevant parameter in an embodiment of the present invention in which a; the underground water generally comprises upper layer stagnant water, diving, pressure bearing water and bedrock fracture water; the applicable stratum comprises a diving aquifer 5, a first water-resisting layer 6, a confined aquifer 7 and a second water-resisting layer 8; the diving water-bearing layer 5 is a soil layer containing diving, the bearing water-bearing layer 7 is a soil layer containing bearing water, and the first water-bearing layer 6 and the second water-bearing layer 8 are impervious soil layers; the diving aquifer 5 is positioned above the first water barrier 6, the first water barrier 6 is positioned above the confined aquifer 7, and the confined aquifer 7 is positioned above the second water barrier 8. The bottom of the foundation pit is positioned in the first waterproof layer 6 or the confined aquifer 7.
The confined water level 3 and the diving water level 4 are respectively monitored by a confined water level meter and a diving water level meter. The bottom of the foundation pit is positioned in either the first waterproof layer 7 or the confined aquifer 8.
The structure specifically includes: a bottom-falling type waterproof curtain 2 and a confined water precipitation well 1;
a bottom-falling type waterproof curtain 2 with the periphery closed is arranged in the foundation pit, and the bottom end of the bottom-falling type waterproof curtain 2 penetrates through the diving aquifer 5, the first water-resisting layer 6 and the confined aquifer 7 and enters the second water-resisting layer 8;
a plurality of pressure-bearing precipitation wells 1 are arranged in the area surrounded by the falling bottom type waterproof curtain 2; the confined water precipitation well 1 is from last to being real pipe 9, filter tube 10 and sedimentation tube 11 down in proper order, immersible pump 12 is located filter tube 10 for take out the confined water in the foundation ditch. The pump capacity of the submersible pump 12 is 50-80 m3H is used as the reference value. The filter pipe 10 is located in the confined aquifer 7.
The falling-bottom type waterproof curtain 2 comprises a cement-soil mixing wall with equal thickness, an underground continuous wall and a bored secant pile which are obtained by adopting a TRD construction method and a CSM construction method, and the falling-bottom type waterproof curtain 3 can be obtained by optionally selecting one of the cement-soil mixing wall, the underground continuous wall and the bored secant pile for construction.
The pressure-bearing precipitation well 1 comprises a pipe well adopting a pipe well point precipitation method, a pipe well adopting a jet well point precipitation method and a pipe well adopting a vacuum well point precipitation method.
A water meter 14 and a water stop valve 13 are arranged above the pressure-bearing precipitation well 1, and the water meter 14 is used for monitoring the amount of pressure-bearing water discharged from the pressure-bearing precipitation well; the water stop valve 13 is used for preventing high-pressure water from reversely flowing back into the submersible pump 12 to damage the submersible pump 12; the water meter 14 and the water stop valve 13 are connected with the submersible pump 12 through a water pipe.
As shown in fig. 1, a row of bottom-type waterproof curtains 2 with the periphery closed are constructed along the periphery of an underground space, and a certain number of confined water precipitation wells 1 are arranged in the bottom-type waterproof curtains 2. The number of the confined water precipitation wells 1 is comprehensively determined according to the area of a foundation pit, the water quantity of the confined aquifer 7 and the observation condition of the confined water level 3, and the confined water precipitation wells 1 are opened according to the requirement.
As shown in fig. 2, a horizontal line passing through the confined water precipitation tube well 1 indicates a foundation pit bottom 15, the foundation pit bottom 15 is located in the first water-resisting layer 6, and when the calculation of the anti-surge stability of the thickness of the remaining impermeable soil layer between the foundation pit bottom 15 and the top end of the partition 6 of the confined water-resisting layer 7 does not meet the requirement, the confined water is subjected to precipitation.
As shown in fig. 3, the horizontal line passing through the confined water precipitation tubular well 1 indicates a foundation pit bottom 15, and the foundation pit bottom 15 is located in the confined aquifer 7 to precipitate confined water.
As shown in fig. 5, the use conditions of the confined water precipitation well are as follows: the anti-surge stability of the first water-resisting layer 6 is not satisfactory or the bottom 15 of the foundation pit directly penetrates through the first water-resisting layer 6 and enters the confined aquifer 7.
For the area with rich water, when the calculation of the anti-surge stability of the thickness of the residual impervious layer between the bottom 15 of the foundation pit and the top end of the confined aquifer 7 does not meet the requirement, namely the calculation meets the formula (1), the confined water needs to be subjected to precipitation.
In the formula KhAnti-inrush safety factor, K in this examplehTaking 1.2;
gamma-average gravity (kN/m) of residual soil layer between the top end of the confined aquifer 8 and the bottom 15 of the foundation pit3)；
hwThe thickness (m) of the residual soil layer between the top end of the confined aquifer 8 and the bottom 15 of the foundation pit;
γwthe water gravity (kN/m) between the top end of the confined aquifer 8 and the bottom 15 of the foundation pit3)；
D-the height (m) of the confined water head from the top end of the confined aquifer 8 to the confined water level 4.
The utility model has the advantages that:
1. for foundation pit water stop and precipitation with a small amount of water in a submerged aquifer and rich in confined water, the confined water precipitation well is arranged, so that the level of the confined water in the foundation pit is effectively reduced, the risk of osmotic damage such as gushing and soil flowing is reduced, the construction period is shortened, and the safety of foundation pit construction is guaranteed.
2. The closed bottom-falling type waterproof curtain is arranged around the foundation pit, so that hydraulic connection inside and outside the foundation pit is effectively isolated, the underground water level outside the foundation pit is guaranteed not to change due to precipitation in the foundation pit, and the purpose of protecting buildings (structures) around the foundation pit is further achieved.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A structure for stopping water and lowering water in a foundation pit is used for lowering and draining water in the foundation pit, and applicable strata comprise a diving aquifer, a first water-resisting layer, a confined aquifer and a second water-resisting layer; the diving aquifer is a soil layer containing diving, the confined aquifer is a soil layer containing confined water, and the first waterproof layer and the second waterproof layer are impervious soil layers; the diving aquifer is positioned above a first water-resisting layer, the first water-resisting layer is positioned above the confined aquifer, and the confined aquifer is positioned above the second water-resisting layer; the bottom of the foundation pit is positioned in the first waterproof layer or the pressure-bearing water-containing layer; the method is characterized in that: the structure includes: a bottom-falling type waterproof curtain and a confined water precipitation well;
a bottom-falling type waterproof curtain with the periphery closed is arranged in the foundation pit, and the bottom end of the bottom-falling type waterproof curtain penetrates through the diving aquifer, the first water-resisting layer and the confined aquifer and enters the second water-resisting layer;
a plurality of pressure-bearing precipitation wells are arranged in the area surrounded by the falling-bottom type waterproof curtain; the confined water precipitation well is from last to being real pipe, filter tube and sedimentation tube down in proper order, install the immersible pump in the filter tube for take out the confined water in the foundation ditch.
2. The structure of foundation ditch stagnant water precipitation of claim 1 characterized in that: the bottom-falling waterproof curtain is a cement-soil mixing wall with equal thickness, an underground continuous wall or a bored cast-in-place pile.
3. The structure of foundation ditch stagnant water precipitation of claim 1 characterized in that: the pressure-bearing precipitation well comprises a pipe well adopting a pipe well point precipitation method for precipitation, a jet well point precipitation method for precipitation and a vacuum well point precipitation method for precipitation.
4. The structure of foundation ditch stagnant water precipitation of claim 1 characterized in that: the pump capacity of the submersible pump is 50-80 m3/h。
5. The structure of foundation ditch stagnant water precipitation of claim 1 characterized in that: the filter pipe is positioned in the confined aquifer.
6. The structure of foundation ditch stagnant water precipitation of claim 1 characterized in that: a water meter and a water stop valve are arranged above the pressure-bearing precipitation well, and the water meter is used for monitoring the amount of pressure-bearing water discharged from the pressure-bearing precipitation well; the water stop valve is used for preventing high-pressure water from reversely flowing back into the submersible pump to damage the submersible pump; the water meter and the water stop valve are connected with the submersible pump through a water pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020111791.6U CN212001207U (en) | 2020-01-17 | 2020-01-17 | Foundation ditch stagnant water precipitation's structure |
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| CN202020111791.6U CN212001207U (en) | 2020-01-17 | 2020-01-17 | Foundation ditch stagnant water precipitation's structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186961A (en) * | 2021-04-29 | 2021-07-30 | 中国一冶集团有限公司 | Foundation pit drainage method capable of reducing influence on surrounding buildings |
| CN113235612A (en) * | 2021-05-17 | 2021-08-10 | 中铁二十四局集团有限公司 | Deep foundation pit supporting construction method for soft soil foundation high-pressure-bearing water environment adjacent to high-speed rail |
| CN113463672A (en) * | 2021-08-09 | 2021-10-01 | 中国建筑第四工程局有限公司 | Precipitation structure for aquifer and water-resisting layer slowly-inclined interbed and construction method |
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2020
- 2020-01-17 CN CN202020111791.6U patent/CN212001207U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186961A (en) * | 2021-04-29 | 2021-07-30 | 中国一冶集团有限公司 | Foundation pit drainage method capable of reducing influence on surrounding buildings |
| CN113235612A (en) * | 2021-05-17 | 2021-08-10 | 中铁二十四局集团有限公司 | Deep foundation pit supporting construction method for soft soil foundation high-pressure-bearing water environment adjacent to high-speed rail |
| CN113463672A (en) * | 2021-08-09 | 2021-10-01 | 中国建筑第四工程局有限公司 | Precipitation structure for aquifer and water-resisting layer slowly-inclined interbed and construction method |
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