CN105401587A - Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system - Google Patents
Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system Download PDFInfo
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- CN105401587A CN105401587A CN201511003373.5A CN201511003373A CN105401587A CN 105401587 A CN105401587 A CN 105401587A CN 201511003373 A CN201511003373 A CN 201511003373A CN 105401587 A CN105401587 A CN 105401587A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 24
- 239000002131 composite material Substances 0.000 title abstract 3
- 239000002689 soil Substances 0.000 claims abstract description 36
- 238000001556 precipitation Methods 0.000 claims description 32
- 239000013049 sediment Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 238000009412 basement excavation Methods 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 11
- 239000002352 surface water Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007774 longterm Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- -1 rainwater Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and a water descending method of the water descending system, relates to the technical field of civil construction, and aims to solve the technical problems that the water descending effects need to be improved and the water descending period needs to be shortened. The system comprises one or more deep-layer vacuum tube well units and a plurality of shallow-layer water descending tube well units, wherein the distribution density of the deep-layer vacuum tube well units is smaller than the distribution density of the shallow-layer water descending tube well units; the deep-layer vacuum tube well units are used for unwatering deep soil layers of the foundation pits for a long term, and the shallow-layer water descending tube well units and the deep-layer vacuum tube well units are used for jointly implementing quick unwatering on shallow soil layers of the foundation pits. The system and the method provided by the invention are suitable for water descending tasks for composite stratums of the large-scale foundation pits.
Description
Technical field
The present invention relates to civil engineering technology, particularly relate to a kind of depth well foundation pit dewatering system of Large Foundation Pit compound stratum and the technology of precipitation method thereof.
Background technology
Along with the exploitation of urban underground space, large deep foundation pit construction also gets more and more, the control of construction period to underground water is more and more important, for the soil layer within the scope of excavation, for reducing water content of soil, improving soil shear strength and base pit stability, be convenient to construction in soil excavation and foundation ditch, the general drainage pipe well that adopts carries out precipitation.
At present for drainage precipitation, general area of pressing adopts evenly laying drainage pipe well, and the degree of depth is unified by 5 ~ 6m consideration under excavation face, namely the difference of soil layer on section within the scope of excavation is not considered, the difference in each layer soil excavation construction cycle is not considered yet, consider from convenient construction and economy, current general common drainage well spacing is not enough and then spacing is relatively excessive to the drainage of deep soil layer for the drainage density of superficial part soil layer, there is dewatering effect difference and the long defect of cycle in precipitation.The disposal also not considering the difference, particularly partial lined meeting stratum laid by simultaneously current drainage well.For Large Foundation Pit because foundation ditch area is large, between flush period, the outer row that enters to blend of surface water is a more serious construction problem, as dealt with improperly, the drainage dewatering effect in early stage may be offset by the bright draining problem of infiltrating completely, because of construction period and economic dispatch problem, such Large Foundation Pit rarely has corresponding measure.
Summary of the invention
For the defect existed in above-mentioned prior art, it is good that technical problem to be solved by this invention is to provide a kind of dewatering effect, and the depth well foundation pit dewatering system of the Large Foundation Pit compound stratum of excavation of foundation pit operating mode of combining closely and precipitation method thereof.
In order to solve the problems of the technologies described above, the depth well foundation pit dewatering system of a kind of Large Foundation Pit compound stratum provided by the present invention, relate to civil engineering foundation pit, it is characterized in that: this system comprises at least one deep vacuum pipe well unit, and to multiple shallow-layer precipitation pipe well unit, the quantity of described shallow-layer precipitation pipe well unit is more than the quantity of deep vacuum pipe well unit, and the layout density of each deep vacuum pipe well unit is less than the layout density of each shallow-layer precipitation pipe well unit;
Described deep vacuum pipe well unit comprises deep layer downcast well pipe, chimney filter, sediment tube, filter, described deep layer downcast well pipe, chimney filter, sediment tube is all perpendicular to be put in the soil layer of foundation ditch, and chimney filter is positioned at below excavation of foundation pit face, the upper end mouth of pipe of chimney filter docks with the lower end mouth of pipe of deep layer downcast well pipe, the lower end mouth of pipe of chimney filter docks with the upper end mouth of pipe of sediment tube, described filter envelopes chimney filter, the tube wall of sediment tube and the bottom tube wall of deep layer downcast well pipe, deep layer downcast well pipe, chimney filter, the outer tube wall of sediment tube is coated with the first filter material layer, and the backfill face capping of this first filter material layer has clay sealing layer, deep layer submersible pump is provided with in chimney filter, content gauge, the upper end mouth of pipe of deep layer downcast well pipe is closed by a well lid, well lid offers aspirating hole,
Described shallow-layer precipitation pipe well unit comprises shallow-layer downcast well pipe, described shallow-layer downcast well pipe erects to be put in the soil layer of foundation ditch, and the bottom of shallow-layer downcast well pipe is higher than the bottom of deep layer downcast well pipe, the upper end mouth of pipe of shallow-layer downcast well pipe is above the ground level, shallow-layer downcast well pipe is directly entered to prevent surface water, shallow-layer submersible pump is provided with in shallow-layer downcast well pipe, the lower tubular section of shallow-layer downcast well pipe offers radial through filter opening, the outer tube wall of shallow-layer downcast well pipe is coated with the second filter material layer, and the backfill face of this second filter material layer is lower than ground.
The deep soil layer of each deep vacuum pipe well unit to foundation ditch that utilize provided by the present invention carries out drainage at a slow speed, and utilizes each shallow-layer precipitation pipe well unit and deep vacuum pipe well unit to the quick drainage of superficial part soil layer common implementing of foundation ditch.
Further, after the superficial part soil layer drainage of foundation ditch completes, each shallow-layer precipitation pipe well unit is extracted from the soil body.
The depth well foundation pit dewatering system of Large Foundation Pit compound stratum provided by the invention and precipitation method thereof; by the cooperate precipitation of densely covered shallow-layer precipitation pipe well unit with the deep vacuum pipe well unit of thin cloth; make superficial part soil layer energy drainage fast; deep soil layer then drainage at a slow speed; both ensure that dewatering effect; to combine closely again excavation of foundation pit operating mode; decrease pipe well protection quantity; solve excavation of foundation pit cycle and foundation pit dewatering correspondence problem over time and space, and the drainage efficiency of large foundation ditch superficial part soil layer.
Accompanying drawing explanation
Fig. 1 is the structural representation of the depth well foundation pit dewatering system of the Large Foundation Pit compound stratum of the embodiment of the present invention.
Detailed description of the invention
Illustrate below in conjunction with accompanying drawing and embodiments of the invention are described in further detail; but the present embodiment is not limited to the present invention; every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in, the pause mark in the present invention all represent and relation.
As shown in Figure 1, the depth well foundation pit dewatering system of a kind of Large Foundation Pit compound stratum that the embodiment of the present invention provides, relate to civil engineering foundation pit, it is characterized in that: this system comprises at least one deep vacuum pipe well unit, and to multiple shallow-layer precipitation pipe well unit, the quantity of described shallow-layer precipitation pipe well unit is more than the quantity of deep vacuum pipe well unit, and the layout density of each deep vacuum pipe well unit is less than the layout density of each shallow-layer precipitation pipe well unit;
Described deep vacuum pipe well unit comprises deep layer downcast well pipe 11, chimney filter 12, sediment tube 13, filter 14, described deep layer downcast well pipe 11, chimney filter 12, sediment tube 13 is all perpendicular to be put in the soil layer of foundation ditch, and chimney filter 12 is positioned at below excavation of foundation pit face, the upper end mouth of pipe of chimney filter 12 docks with the lower end mouth of pipe of deep layer downcast well pipe 11, the lower end mouth of pipe of chimney filter 12 docks with the upper end mouth of pipe of sediment tube 13, described filter 14 envelopes chimney filter 12, the tube wall of sediment tube 13 and the bottom tube wall of deep layer downcast well pipe 11, the soil body of foundation ditch and deep layer downcast well pipe 11, chimney filter 12, an annular space is formed between the outer tube wall of sediment tube 13, in this annular space, backfill filtrate forms the first filter material layer 17, and the backfill face capping of this first filter material layer 17 has clay sealing layer 16, deep layer submersible pump 15 is provided with in chimney filter 12, content gauge 18, the upper end mouth of pipe of deep layer downcast well pipe 11 is closed by a well lid, well lid offers aspirating hole,
Described shallow-layer precipitation pipe well unit comprises shallow-layer downcast well pipe 21, described shallow-layer downcast well pipe 21 is perpendicular to be put in the soil layer of foundation ditch, and the bottom of shallow-layer downcast well pipe 21 is higher than the bottom of deep layer downcast well pipe 11, the upper end mouth of pipe of shallow-layer downcast well pipe 21 is above the ground level, shallow-layer downcast well pipe 21 is directly entered to prevent surface water, shallow-layer submersible pump 22 is provided with in shallow-layer downcast well pipe 21, the lower tubular section of shallow-layer downcast well pipe 21 offers radial through filter opening 211, an annular space is formed between the soil body of foundation ditch and the outer tube wall of shallow-layer downcast well pipe 21, in this annular space, backfill filtrate forms the second filter material layer 23, and the backfill face of this second filter material layer 23 is lower than ground, to converge the surface water such as rainwater, surface water is made to enter in shallow-layer downcast well pipe 21 after the second filter material layer 23 filters, guarantee the water quality of the outer draining of pumping.
The precipitation method of the depth well foundation pit dewatering system of the Large Foundation Pit compound stratum that the embodiment of the present invention provides, it is characterized in that: utilize the deep soil layer of each deep vacuum pipe well unit to foundation ditch to carry out drainage at a slow speed, and utilize each shallow-layer precipitation pipe well unit and each deep vacuum pipe well unit to the quick drainage of superficial part soil layer common implementing of foundation ditch; And after the superficial part soil layer drainage of foundation ditch completes, each shallow-layer precipitation pipe well unit is extracted, so that subsequent construction from the soil body.
When the deep soil layer of shallow-layer precipitation pipe well unit to foundation ditch carries out drainage, extracted out the water body collected in shallow-layer downcast well pipe 21 by shallow-layer submersible pump 22, the water body collected in shallow-layer downcast well pipe 21 comprise water in foundation ditch shallow stratum and period of raining collect into bright draining, in shallow-layer submersible pump 22 pump process, the gravity water in foundation ditch shallow stratum can constantly flow into shallow-layer dewatering well pipe well under gravity;
When the deep soil layer of deep vacuum pipe well unit to foundation ditch carries out drainage, utilize the gas in vacuum pump extraction deep layer downcast well pipe 11, the water in deep layer downcast well pipe 11 extracted out by upper deep layer submersible pump 15, deep layer downcast well pipe 11 periphery is made to form precipitation funnel, gravity water in soil layer constantly flows into deep layer downcast well pipe 11 under gravity and negative pressure of vacuum effect, because chimney filter 12 is positioned at below excavation of foundation pit face, the lasting maintenance of the vacuum in deep layer downcast well pipe 11 can be guaranteed, first filter material layer 17, clay sealing layer 16 and filter 14 can guarantee that all there is water guide function in the aquifer at deep layer downcast well pipe 11 pairs of different depth places, content gauge 18 can guarantee that deep layer submersible pump 15 can use always under water level, guarantee the application life of deep layer submersible pump 15, also can control the water level in deep layer downcast well pipe 11 simultaneously.
Claims (3)
1. the depth well foundation pit dewatering system of a Large Foundation Pit compound stratum, relate to civil engineering foundation pit, it is characterized in that: this system comprises at least one deep vacuum pipe well unit, and to multiple shallow-layer precipitation pipe well unit, the quantity of described shallow-layer precipitation pipe well unit is more than the quantity of deep vacuum pipe well unit, and the layout density of each deep vacuum pipe well unit is less than the layout density of each shallow-layer precipitation pipe well unit;
Described deep vacuum pipe well unit comprises deep layer downcast well pipe, chimney filter, sediment tube, filter, described deep layer downcast well pipe, chimney filter, sediment tube is all perpendicular to be put in the soil layer of foundation ditch, and chimney filter is positioned at below excavation of foundation pit face, the upper end mouth of pipe of chimney filter docks with the lower end mouth of pipe of deep layer downcast well pipe, the lower end mouth of pipe of chimney filter docks with the upper end mouth of pipe of sediment tube, described filter envelopes chimney filter, the tube wall of sediment tube and the bottom tube wall of deep layer downcast well pipe, deep layer downcast well pipe, chimney filter, the outer tube wall of sediment tube is coated with the first filter material layer, and the backfill face capping of this first filter material layer has clay sealing layer, deep layer submersible pump is provided with in chimney filter, content gauge, the upper end mouth of pipe of deep layer downcast well pipe is closed by a well lid, well lid offers aspirating hole,
Described shallow-layer precipitation pipe well unit comprises shallow-layer downcast well pipe, described shallow-layer downcast well pipe erects to be put in the soil layer of foundation ditch, and the bottom of shallow-layer downcast well pipe is higher than the bottom of deep layer downcast well pipe, the upper end mouth of pipe of shallow-layer downcast well pipe is above the ground level, shallow-layer downcast well pipe is directly entered to prevent surface water, shallow-layer submersible pump is provided with in shallow-layer downcast well pipe, the lower tubular section of shallow-layer downcast well pipe offers radial through filter opening, the outer tube wall of shallow-layer downcast well pipe is coated with the second filter material layer, and the backfill face of this second filter material layer is lower than ground.
2. the precipitation method of the depth well foundation pit dewatering system of Large Foundation Pit compound stratum according to claim 1, it is characterized in that: utilize the deep soil layer of each deep vacuum pipe well unit to foundation ditch to carry out drainage at a slow speed, and utilize each shallow-layer precipitation pipe well unit and deep vacuum pipe well unit to the quick drainage of superficial part soil layer common implementing of foundation ditch.
3. the precipitation method of the depth well foundation pit dewatering system of Large Foundation Pit compound stratum according to claim 2, is characterized in that: after the superficial part soil layer drainage of foundation ditch completes, and is extracted by each shallow-layer precipitation pipe well unit from the soil body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003373.5A CN105401587A (en) | 2015-12-29 | 2015-12-29 | Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003373.5A CN105401587A (en) | 2015-12-29 | 2015-12-29 | Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system |
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| CN105401587A true CN105401587A (en) | 2016-03-16 |
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| CN201511003373.5A Pending CN105401587A (en) | 2015-12-29 | 2015-12-29 | Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105696610A (en) * | 2016-04-11 | 2016-06-22 | 上海智富建设工程有限公司 | U type structure for dry and wet well point dewatering and unwatering and construction method of structure |
| CN108612112A (en) * | 2018-05-30 | 2018-10-02 | 中国二十冶集团有限公司 | One kind adjoining base pit dewatering recycling method |
| CN110080248A (en) * | 2019-06-03 | 2019-08-02 | 河南城建学院 | Nearly depth of water foundation pit supporting construction |
| CN110629776A (en) * | 2019-09-23 | 2019-12-31 | 中铁开发投资集团有限公司 | Foundation pit dewatering well with backwashing function and backwashing method thereof |
| CN111287205A (en) * | 2020-03-20 | 2020-06-16 | 福建工程学院 | Deep multi-stage dynamic foundation pit dewatering system and dewatering method thereof |
| CN112900462A (en) * | 2021-01-22 | 2021-06-04 | 南通市规划设计院有限公司 | Pipeline foundation trench shallow layer precipitation structure and construction method |
| CN117188501A (en) * | 2023-09-14 | 2023-12-08 | 上海长凯岩土工程有限公司 | A device for draining and dewatering residual water at the formation interface |
| CN117344770A (en) * | 2023-08-31 | 2024-01-05 | 中国葛洲坝集团第一工程有限公司 | Emergency treatment methods for large deep foundation pit surges |
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| CN205444216U (en) * | 2015-12-29 | 2016-08-10 | 上海广联环境岩土工程股份有限公司 | Depth well foundation pit dewatering system on compound stratum of large -scale foundation ditch |
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| JP2002121743A (en) * | 2000-10-12 | 2002-04-26 | Nisshin Kenko Kk | Ground water lowering method and ground water lowering device used for the method |
| JP2005090015A (en) * | 2003-09-16 | 2005-04-07 | Ohbayashi Corp | Ground excavating method |
| CN103088805A (en) * | 2013-02-08 | 2013-05-08 | 中国建筑第八工程局有限公司 | Artesian aquifer water level composite monitoring well and construction method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105696610A (en) * | 2016-04-11 | 2016-06-22 | 上海智富建设工程有限公司 | U type structure for dry and wet well point dewatering and unwatering and construction method of structure |
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| CN108612112A (en) * | 2018-05-30 | 2018-10-02 | 中国二十冶集团有限公司 | One kind adjoining base pit dewatering recycling method |
| CN110080248A (en) * | 2019-06-03 | 2019-08-02 | 河南城建学院 | Nearly depth of water foundation pit supporting construction |
| CN110629776A (en) * | 2019-09-23 | 2019-12-31 | 中铁开发投资集团有限公司 | Foundation pit dewatering well with backwashing function and backwashing method thereof |
| CN110629776B (en) * | 2019-09-23 | 2021-04-20 | 中铁开发投资集团有限公司 | Foundation pit dewatering well with backwashing function and backwashing method thereof |
| CN111287205A (en) * | 2020-03-20 | 2020-06-16 | 福建工程学院 | Deep multi-stage dynamic foundation pit dewatering system and dewatering method thereof |
| CN112900462A (en) * | 2021-01-22 | 2021-06-04 | 南通市规划设计院有限公司 | Pipeline foundation trench shallow layer precipitation structure and construction method |
| CN112900462B (en) * | 2021-01-22 | 2022-03-11 | 南通市规划设计院有限公司 | Pipeline foundation trench shallow layer precipitation structure and construction method |
| CN117344770A (en) * | 2023-08-31 | 2024-01-05 | 中国葛洲坝集团第一工程有限公司 | Emergency treatment methods for large deep foundation pit surges |
| CN117188501A (en) * | 2023-09-14 | 2023-12-08 | 上海长凯岩土工程有限公司 | A device for draining and dewatering residual water at the formation interface |
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Effective date of registration: 20160803 Address after: 200444 Shanghai city Baoshan District Jinqiu road 2399 Lane 198, building 1 B zone Applicant after: SHANGHAI GUANGLIAN ENVIRONMENTAL & GEOTECHNICAL ENGINEERING CO., LTD. Applicant after: Shanghai Construction Engineering No.4 Construction Group Co., Ltd. Applicant after: SHANGHAI ZHUYUAN ENGINEERING MANAGEMENT CO., LTD. Address before: 200444 Shanghai city Baoshan District Jinqiu road 2399 Lane 198, building 1 B zone Applicant before: SHANGHAI GUANGLIAN ENVIRONMENTAL & GEOTECHNICAL ENGINEERING CO., LTD. |
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