CN110878557A - Layered bidirectional drainage method and device for foundation pit dewatering - Google Patents
Layered bidirectional drainage method and device for foundation pit dewatering Download PDFInfo
- Publication number
- CN110878557A CN110878557A CN201911235126.6A CN201911235126A CN110878557A CN 110878557 A CN110878557 A CN 110878557A CN 201911235126 A CN201911235126 A CN 201911235126A CN 110878557 A CN110878557 A CN 110878557A
- Authority
- CN
- China
- Prior art keywords
- well
- foundation pit
- drainage
- section
- dewatering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 239000002689 soil Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 33
- 238000001556 precipitation Methods 0.000 claims description 15
- 238000009412 basement excavation Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 239000004746 geotextile Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- 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 relates to the technical field of foundation pit dewatering, in particular to a layered bidirectional dewatering method and a layered bidirectional dewatering device for foundation pit dewatering, which are characterized in that: arranging well structures at intervals in a foundation pit field, wherein the well structures are used as a drainage well and a gas injection well; the drainage well is used for draining the foundation pit field, and the gas injection well is used for injecting high-pressure gas into the foundation pit field. The invention has the advantages that: the dewatering efficiency is effectively improved; the construction difficulty caused by the difference of well forming modes is avoided, and the drainage well and the gas injection well are arranged at intervals to facilitate the exchange of the drainage well and the gas injection well in the drainage process; the effect of draining the thick soil can be obviously improved; the method greatly improves the local blocking phenomenon caused by long-term directional flow in the well, enhances the connectivity among soil body gaps, enlarges a drainage channel and increases the water yield in the drainage well.
Description
Technical Field
The invention relates to the technical field of foundation pit dewatering, in particular to a layered bidirectional dewatering method and a layered bidirectional dewatering device for foundation pit dewatering.
Background
With the continuous advance of urbanization, a plurality of complex underground structures are increasing. Excavation of a foundation pit is a primary procedure for large-scale underground structure construction. The soft soil area has the characteristics of high water content, high compressibility and the like, and necessary precipitation measures are required to be carried out in the process of excavation of the foundation pit so as to dredge soil in the area, enhance the strength of the soil and ensure the stability of excavation of the foundation pit. In general, engineers use drainage wells disposed in the pits to reduce the water content of the soil for unpressurized aquifers.
Practical engineering shows that the following disadvantages exist in the construction process of carrying out the drainage well in the soft soil layer: (1) the low permeability of the soft soil causes slow dewatering and draining rate of the dewatering well, and the construction period is influenced; (2) the water-permeable section is limited by the soil body property of the soil body and the clearance of the filter material, and the precipitation rate in the well is further slowed down due to the blockage of the water-permeable section along with the lapse of precipitation time; (3) the soil layer with large thickness mostly needs to be excavated in layers, and the prior art often leads to the vacuum failure of the dredging well after the upper soil layer is excavated, so that the further dredging of the deep soil body is difficult to realize.
Disclosure of Invention
The invention aims to provide a layered bidirectional dewatering method and a layered bidirectional dewatering device for foundation pit dewatering according to the defects of the prior art, wherein a well structure with the same structure is used as a dewatering well and a gas injection well, so that the foundation pit is subjected to combined dewatering and dewatering, the problem that the vacuum degree is limited greatly during dewatering and the higher dewatering pressure difference is difficult to provide and maintain is solved, the pore water pressure of the adjacent soil body is increased through the gas injection well, the pressure difference between the dewatering well and the soil body is increased, the dewatering of water in the soil is accelerated, and the dewatering efficiency is improved.
The purpose of the invention is realized by the following technical scheme:
a layered bidirectional dewatering method for foundation pit dewatering is characterized in that: arranging well structures at intervals in a foundation pit field, wherein the well structures are used as a drainage well and a gas injection well; the drainage well is used for draining the foundation pit field, and the gas injection well is used for injecting high-pressure gas into the foundation pit field.
When one well structure is used as a drainage well to drain the foundation pit field, the other well structure adjacent to the well structure is used as a gas injection well to inject high-pressure gas into the foundation pit field; after the operation is carried out for a period of time, the well structure serving as the drainage well is used as a gas injection well to inject high-pressure gas into the foundation pit field, the other well structure serving as the gas injection well is used as a drainage well to extract and drain the foundation pit field, and circulation is exchanged so as to realize bidirectional drainage.
The well structure comprises a plurality of filter sections and the sealing sections are respectively arranged between the filter sections; digging out soil between a first sealing section and a second sealing section from shallow to deep after drainage of a shallow soil layer in a foundation pit field is finished, cutting off a well structure above the second sealing section, continuously performing bidirectional drainage at the height position of the second sealing section, continuously digging out soil after drainage is finished, and sequentially implementing all soil excavation within the range of the well structure according to the sequence to realize layered bidirectional drainage.
A device for the layered bidirectional dewatering method for foundation pit dewatering is disclosed, which is characterized in that: the device comprises a well structure, wherein the well structure comprises a well pipe section, a sealing section, a filtering section and a settling pipe section, the settling pipe section is positioned at the bottom of the well structure, the top end of the settling pipe section is connected with the filtering section, the filtering section is connected with the sealing section, and the sealing section is connected with the well pipe section.
The well pipe section is made of metal or plastic material and is connected with other parts of the well structure through welding or mechanical connection.
The seal section comprises a non-porous well pipe section and a seal structure, wherein the seal structure is arranged on the periphery of the non-porous well pipe section.
The sealing structure is an inclusion arranged on the periphery of the non-porous well casing section, the inclusion is connected with a grouting pipe, and grouting is performed in the inclusion through the grouting pipe to form grouting body, so that the sealing structure is formed.
The filter section can be composed of a well pipe with a hole, a water-permeable material well pipe or a water-permeable filter pipe, and a water-permeable filter material is arranged on the periphery of the filter section.
The settling pipe section is made of metal or plastic pipe.
The device also comprises a water outlet system and a gas injection system, wherein the water outlet system and the gas injection system can be respectively connected with the well structure.
The invention has the advantages that: 1) the combination of the vacuum well and the filling gas well can effectively improve the dewatering efficiency; 2) the same structure of the drainage well and the gas injection well is adopted, so that the construction difficulty caused by the difference of well forming modes is avoided, and the drainage well and the gas injection well are arranged at intervals to facilitate the exchange of the drainage well and the gas injection well in the drainage process; 3) the layered excavation mode of dewatering, excavation and re-dewatering is adopted, so that the dewatering effect on thick soil can be obviously improved; 4) the circulation mutual energy conversion of the drainage well and the gas injection well greatly improves the local blocking phenomenon caused by long-term directional flow in the well, enhances the connectivity among soil body gaps, enlarges a drainage channel and increases the water yield in the drainage well. Therefore, the invention obviously improves the effect of dewatering and dewatering, and has stronger practicability and reliability.
Drawings
FIG. 1 is a schematic diagram of a well configuration of the present invention;
FIG. 2 is a different floor plan of the well of the present invention;
FIG. 3 is a schematic structural diagram of a seal segment according to an embodiment of the present invention;
FIG. 4 is a schematic view of a filter segment according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of step two according to the present invention;
FIG. 6 is a schematic view of step three according to the present invention;
FIG. 7 is a diagram illustrating a fourth step of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-7, the labels 1-8, 4.1-4.2, 5.1-5.2 are respectively expressed as: the device comprises a drainage well 1, a gas injection well 2, a well pipe section 3, a sealing section 4, a filtering section 5, a settling pipe section 6, a water outlet system 7, a gas injection system 8, a non-porous well pipe section 4.1, a grouting pipe 4.2, a geotextile bag 4.3, a grouting body 4.4, a round hole filter pipe 5.1 and a filter material 5.2.
Example (b): according to the layered bidirectional dewatering method for foundation pit dewatering, the main body of the embodiment is mainly realized by combining the dewatering well 1 and the gas injection well 2, wherein the dewatering well 1 and the gas injection well 2 are formed in the same mode, namely the well structures of the dewatering well 1 and the gas injection well 2 are the same. As shown in figure 1, the drainage well and the gas injection well 2 both comprise a well pipe section 3, a sealing section 4, a filtering section 5 and a settling pipe section 6.
The well pipe section 3 is made of metal pipe materials, and is connected with other parts of the well structure through welding or reliable mechanical connection, and the well pipe section mainly plays a role of a connecting piece.
As shown in fig. 3, the sealing section 4 includes a non-porous well pipe section 4.1, a grouting pipe 4.2, a geotextile bag 4.3 and a grouting body 4.4. Wherein, the geotextile bag 4.3 as an inclusion is fixed on the outer wall of the non-porous well pipe 4.1, and a grouting pipe 4.2 is led out from the upper part of the geotextile bag and is used for injecting grouting 4.4; grouting is performed into the geotextile bag 4.3 through the grouting pipe 4.2 to form a grouting body 4.4, so that a sealing structure is formed on the outer side of the non-porous well pipe section 4.1, the sealing structure can be tightly attached to the hole wall of the well structure, sealing is realized, and the hydrophobic effect is improved. The length and the number of the sealing sections 4 are determined according to the field soil layer and the layering condition, and the embodiment lists three sealing sections 4 shown in fig. 1 or fig. 2; in practical engineering, the number of the sealing sections 4 can be increased or decreased correspondingly according to practical situations.
As shown in fig. 4, the filter segment 5 is composed of a circular hole filter tube 5.1 and a filter material 5.2. The round hole filter tube 5.1 is uniformly perforated to form a permeable structure, and the outside is filled with filter materials 5.2. The length and number of the filter segments 5 are determined according to the field soil layer and the layering condition, the embodiment lists three filter segments 5, and in the actual engineering, the number of the sealing segments 4 can be correspondingly increased or decreased according to the actual condition.
As shown in fig. 1 or fig. 2, a settling leg 6 is located at the bottom of the overall well structure, using metal tubing, for settling impurities entering the well structure.
As shown in fig. 1 or fig. 2, a water outlet system 7 and a gas injection system 8 are also arranged in the foundation pit site. The water outlet system 7 can be connected with a well structure, vacuum pumping in the well is conducted through a vacuum pressure pump, meanwhile, a water outlet pipe is arranged in the well, and underground water in the well is collected and is sucked to the ground surface through a water outlet pipe to be discharged into a drainage pipeline. The gas injection system 8 can be connected to the well structure and can be formed by connecting a pneumatic pump to the external pipeline.
The specific implementation process of the layered bidirectional hydrophobic method in this embodiment is as follows:
1) forming a well to a specified depth by adopting a mechanical construction mode after leveling a foundation pit field; determining the interval distribution form of the drainage well 1 and the gas injection well 2 according to the field conditions, as shown in FIG. 2 (without being limited thereto); the implementation system is also manufactured and installed in the form of fig. 1.
When the drainage wells 1 and the gas injection wells 2 are arranged, the periphery of each drainage well 1 is adjacent to the gas injection well 2, meanwhile, the periphery of each gas injection well 2 is adjacent to the drainage well 1, and the specific distribution mode is arranged according to actual working conditions.
2) Grouting the geotextile bag 4.3 through the grouting pipe 4.2 to form a grouting body 4.4, and forming an effective sealing section 5 after the strength of the grouting body meets the requirement; the water outlet system 7 is used for vacuumizing and pumping water for the drainage well 1, the gas injection system 8 is used for injecting gas with pressure into the gas injection well 2 for one-way drainage, after the drainage is operated for a period of time, the pipeline arrangement is adjusted, the gas with pressure is injected into the drainage well 1, vacuumizing and pumping water is performed in the gas injection well 2 for drainage in the other direction, and the two-way drainage can be performed circularly according to the requirement, as shown in figure 5.
The problem that the vacuum degree is limited greatly during dewatering and dewatering is solved by utilizing the dewatering well 1 and the gas injection well 2 in a combined dewatering and dewatering mode, higher dewatering pressure difference is difficult to provide and maintain, the pore water pressure of the adjacent soil body is increased through the gas injection well 2, the pressure difference between the dewatering well 1 and the soil body is increased, the dewatering of water in the soil is accelerated, and the dewatering efficiency is improved;
meanwhile, as the well structures of the dewatering well 1 and the gas injection well 2 are consistent, when the dewatering efficiency is possibly reduced after long-time dewatering and precipitation, the method of injecting gas into the dewatering well 1 and vacuumizing the gas injection well 2 solves the problems of reduction of the porosity of soil around the dewatering well and reduction of the water permeability of a permeable section due to long-time water pumping.
3) And (3) excavating the first layer of soil, cutting off the well structure above the second sealing section by 4 after the excavation is finished, and continuously and repeatedly performing the bidirectional dewatering process to finish the dewatering of the lower soil layer, as shown in fig. 6.
4) And after the soil on the lower part is drained, excavating the soil on the second layer, cutting off the well structure above the third sealing section by 4 degrees after the excavation is finished, and continuing the bidirectional drainage process to drain the soil on the last layer, as shown in fig. 7. The layered excavation mode of precipitation, excavation and precipitation can be adopted to obviously improve the effect of draining the thick soil.
5) And after the final soil body is drained, digging out the residual soil body, and finishing the drainage operation of the foundation pit field.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims.
Claims (10)
1. A layered bidirectional dewatering method for foundation pit dewatering is characterized in that: arranging well structures at intervals in a foundation pit field, wherein the well structures are used as a drainage well and a gas injection well; the drainage well is used for draining the foundation pit field, and the gas injection well is used for injecting high-pressure gas into the foundation pit field.
2. The layered bidirectional dewatering method for foundation pit precipitation according to claim 1, characterized in that: when one well structure is used as a drainage well to drain the foundation pit field, the other well structure adjacent to the well structure is used as a gas injection well to inject high-pressure gas into the foundation pit field; after the operation is carried out for a period of time, the well structure serving as the drainage well is used as a gas injection well to inject high-pressure gas into the foundation pit field, the other well structure serving as the gas injection well is used as a drainage well to extract and drain the foundation pit field, and circulation is exchanged so as to realize bidirectional drainage.
3. The layered bidirectional dewatering method for foundation pit precipitation according to claim 1, characterized in that: the well structure comprises a plurality of filter sections and the sealing sections are respectively arranged between the filter sections; digging out soil between a first sealing section and a second sealing section from shallow to deep after drainage of a shallow soil layer in a foundation pit field is finished, cutting off a well structure above the second sealing section, continuously performing bidirectional drainage at the height position of the second sealing section, continuously digging out soil after drainage is finished, and sequentially implementing all soil excavation within the range of the well structure according to the sequence to realize layered bidirectional drainage.
4. A device for the layered bidirectional dewatering method for foundation pit precipitation according to claims 1-3, characterized in that: the device comprises a well structure, wherein the well structure comprises a well pipe section, a sealing section, a filtering section and a settling pipe section, the settling pipe section is positioned at the bottom of the well structure, the top end of the settling pipe section is connected with the filtering section, the filtering section is connected with the sealing section, and the sealing section is connected with the well pipe section.
5. The device for the layered bidirectional dewatering method for foundation pit precipitation according to claim 4, characterized in that: the well pipe section is made of metal or plastic material and is connected with other parts of the well structure through welding or mechanical connection.
6. The device for the layered bidirectional dewatering method for foundation pit precipitation according to claim 4, characterized in that: the seal section comprises a non-porous well pipe section and a seal structure, wherein the seal structure is arranged on the periphery of the non-porous well pipe section.
7. The device for the layered bidirectional dewatering method for foundation pit precipitation according to claim 6, characterized in that: the sealing structure is an inclusion arranged on the periphery of the non-porous well casing section, the inclusion is connected with a grouting pipe, and grouting is performed in the inclusion through the grouting pipe to form grouting body, so that the sealing structure is formed.
8. The device for the layered bidirectional dewatering method for foundation pit precipitation according to claim 4, characterized in that: the filter section can be composed of a well pipe with a hole, a water-permeable material well pipe or a water-permeable filter pipe, and a water-permeable filter material is arranged on the periphery of the filter section.
9. The device for the layered bidirectional dewatering method for foundation pit precipitation according to claim 4, characterized in that: the settling pipe section is made of metal or plastic pipe.
10. The device for the layered bidirectional dewatering method for foundation pit precipitation according to claim 4, characterized in that: the device also comprises a water outlet system and a gas injection system, wherein the water outlet system and the gas injection system can be respectively connected with the well structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911235126.6A CN110878557B (en) | 2019-12-05 | 2019-12-05 | Layered bidirectional drainage method for foundation pit dewatering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911235126.6A CN110878557B (en) | 2019-12-05 | 2019-12-05 | Layered bidirectional drainage method for foundation pit dewatering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110878557A true CN110878557A (en) | 2020-03-13 |
| CN110878557B CN110878557B (en) | 2022-08-02 |
Family
ID=69730745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911235126.6A Active CN110878557B (en) | 2019-12-05 | 2019-12-05 | Layered bidirectional drainage method for foundation pit dewatering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110878557B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809123A (en) * | 2022-04-02 | 2022-07-29 | 中能建路桥工程有限公司 | Multi-stage support foundation pit monitoring method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1147610A (en) * | 1965-04-07 | 1969-04-02 | Paul Willem Van Beveren | Improved method for vertically draining soil, and an arrangement for performing this method |
| CN105442624A (en) * | 2015-12-29 | 2016-03-30 | 上海广联环境岩土工程股份有限公司 | Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof |
| CN207211171U (en) * | 2017-08-03 | 2018-04-10 | 中国电建集团铁路建设有限公司 | A kind of detachable downcomer |
| CN208650077U (en) * | 2018-08-02 | 2019-03-26 | 南京达西岩土工程有限公司 | Silly stratum dewatering well vacuum-dewatering device |
| CN208900072U (en) * | 2018-10-23 | 2019-05-24 | 杨华富 | A kind of novel bag type paste hole packer |
-
2019
- 2019-12-05 CN CN201911235126.6A patent/CN110878557B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1147610A (en) * | 1965-04-07 | 1969-04-02 | Paul Willem Van Beveren | Improved method for vertically draining soil, and an arrangement for performing this method |
| CN105442624A (en) * | 2015-12-29 | 2016-03-30 | 上海广联环境岩土工程股份有限公司 | Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof |
| CN207211171U (en) * | 2017-08-03 | 2018-04-10 | 中国电建集团铁路建设有限公司 | A kind of detachable downcomer |
| CN208650077U (en) * | 2018-08-02 | 2019-03-26 | 南京达西岩土工程有限公司 | Silly stratum dewatering well vacuum-dewatering device |
| CN208900072U (en) * | 2018-10-23 | 2019-05-24 | 杨华富 | A kind of novel bag type paste hole packer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809123A (en) * | 2022-04-02 | 2022-07-29 | 中能建路桥工程有限公司 | Multi-stage support foundation pit monitoring method |
| CN114809123B (en) * | 2022-04-02 | 2024-05-24 | 中能建路桥工程有限公司 | Multistage support foundation pit monitoring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110878557B (en) | 2022-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113279421B (en) | Vacuum dewatering process for deep foundation pit | |
| CN109440775B (en) | Sinking type foundation pit dewatering and drainage system, construction method and use method | |
| CN109339079B (en) | Foundation pit water stopping system adjacent to river permeable stratum and construction process thereof | |
| CN110984200B (en) | Method for draining water of foundation pit of binary geological structure layer | |
| CN113931209A (en) | Large-area deep foundation pit weakly permeable stratum underground water level control method | |
| CN109723071B (en) | Construction method of double-layer steel drum drainage system built in basement floor post-cast strip | |
| CN110878557B (en) | Layered bidirectional drainage method for foundation pit dewatering | |
| CN111411639B (en) | Shallow foundation pit dewatering construction method for water-rich pebble layer | |
| CN111733839A (en) | Method for reinforcing receiving end of deep-buried shield water-rich sand layer next to excavation foundation pit | |
| WO2023173569A1 (en) | Method for treating underground water disaster of weak-permeability soil layer slope | |
| CN211498899U (en) | Foundation pit dewatering arrangement structure | |
| CN203475453U (en) | Deeply-buried type bearing platform curtain structure of bridge | |
| CN211898487U (en) | Diving drainage well structure | |
| CN113293785A (en) | Positive and negative pressure combined dewatering well structure with self-cleaning function and construction method | |
| CN108824465B (en) | Foundation pit engineering dewatering construction structure and construction method | |
| CN203213129U (en) | Controllable non-return drainer | |
| CN204098050U (en) | A kind of control artesian water precipitation system | |
| CN111287205A (en) | Deep multi-stage dynamic foundation pit dewatering system and dewatering method thereof | |
| CN112081125A (en) | Bottom sealing structure of foundation pit in submersible sandy gravel stratum and construction process | |
| CN111218949A (en) | Diving drainage well structure and drainage method | |
| CN111827326B (en) | Rapid water lowering device and method for multi-aquifer-multi-aquifer penetrating submerged well | |
| CN117266212B (en) | Precipitation method for foundation pit located in runoff-type interlayer water-containing stratum | |
| CN113217097B (en) | Deep open type comprehensive dewatering method and water pumping device for subsurface tunnel in water-rich composite stratum | |
| CN203834529U (en) | Pressure-relieving anti-floating device for building foundation construction in high-water-level district | |
| CN104060636A (en) | Depressurization and anti-floating method and device thereof for foundation construction in high water level region building |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 200093 No. 38 Shui Feng Road, Yangpu District, Shanghai. Patentee after: Shanghai Survey, Design and Research Institute (Group) Co.,Ltd. Address before: 200093 No. 38 Shui Feng Road, Yangpu District, Shanghai. Patentee before: SGIDI ENGINEERING CONSULTING (Group) Co.,Ltd. |