CN211498899U - Foundation pit dewatering arrangement structure - Google Patents
Foundation pit dewatering arrangement structure Download PDFInfo
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- CN211498899U CN211498899U CN201922159088.2U CN201922159088U CN211498899U CN 211498899 U CN211498899 U CN 211498899U CN 201922159088 U CN201922159088 U CN 201922159088U CN 211498899 U CN211498899 U CN 211498899U
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- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000001556 precipitation Methods 0.000 claims abstract description 22
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 32
- 238000000034 method Methods 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 7
- 230000008569 process Effects 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
- 238000009412 basement excavation Methods 0.000 description 9
- 239000004746 geotextile Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000003247 decreasing 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
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model relates to a foundation ditch precipitation technical field especially relates to a foundation ditch precipitation arrangement structure, its characterized in that: including interval arrangement's drainage well and gas injection well in the foundation ditch place, the drainage well is used for right the foundation ditch place is extracted hydrophobic, the gas injection well be used for to inject high-pressure gas in the foundation ditch place, wherein the drainage well is close to in one at least the gas injection well. The utility model 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 utility model relates to a foundation ditch precipitation technical field especially relates to a foundation ditch precipitation arrangement structure.
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 utility model aims at providing a foundation ditch precipitation arrangement structure according to the not enough of above-mentioned prior art, do drainage well and gas injection well simultaneously through the well structure that the structure is the same, carry out the joint drainage precipitation to the foundation ditch, the solution is solved and is dredged the drainage when vacuum limited great, is difficult to provide and maintain higher precipitation pressure differential, increases neighbouring soil body pore water pressure through the gas injection well, increases the pressure differential of drainage well and soil body, accelerates the drainage of soil normal water, promotes the efficiency of drenching.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
a foundation pit dewatering arrangement structure is characterized in that: including interval arrangement's drainage well and gas injection well in the foundation ditch place, the drainage well is used for right the foundation ditch place is extracted hydrophobic, the gas injection well be used for to inject high-pressure gas in the foundation ditch place, wherein the drainage well is close to in one at least the gas injection well.
The drainage well and the gas injection well have the same well structure, the well structure comprises a well pipe section, a sealing section, a filtering section and a settling pipe section, wherein 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 structure comprises a plurality of filtering sections and sealing sections which are respectively arranged between every two filtering sections.
The well pipe section is made of metal pipes or plastic materials 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 adopts a metal pipe or a plastic pipe.
And a water outlet system and a gas injection system are respectively arranged in the foundation pit field, and the water outlet system and the gas injection system can be respectively connected with the well structure.
The utility model 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 construction; 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. The event the utility model discloses showing and promoting the effect of driping dewatering, having stronger enforceability and reliability simultaneously.
Drawings
FIG. 1 is a schematic diagram of a well structure according to the present invention;
FIG. 2 is a different plan view of the well of the present invention;
FIG. 3 is a schematic structural view of a sealing section according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a filtration section according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a second step of the embodiment of the present invention;
FIG. 6 is a schematic diagram of the third step of the embodiment of the present invention;
fig. 7 is a diagram illustrating a fourth step of the embodiment 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 accompanying 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): the embodiment of the utility model provides an in foundation ditch precipitation arrangement structure, this embodiment main part mainly jointly realize by hydrophobic well 1 and gas injection well 2, wherein hydrophobic well 1 is the same with gas injection well 2's well-forming mode, and well structure between them is the same promptly. 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 figure 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 (9)
1. A foundation pit dewatering arrangement structure is characterized in that: including interval arrangement's drainage well and gas injection well in the foundation ditch place, the drainage well is used for right the foundation ditch place is extracted hydrophobic, the gas injection well be used for to inject high-pressure gas in the foundation ditch place, wherein the drainage well is close to in one at least the gas injection well.
2. A pit precipitation arrangement according to claim 1, wherein: the drainage well and the gas injection well have the same well structure, the well structure comprises a well pipe section, a sealing section, a filtering section and a settling pipe section, wherein 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.
3. A pit precipitation arrangement according to claim 2, wherein: the well structure comprises a plurality of filtering sections and sealing sections which are respectively arranged between every two filtering sections.
4. A pit precipitation arrangement according to claim 2, wherein: the well pipe section is made of metal pipes or plastic materials and is connected with the well structure through welding or mechanical connection.
5. A pit precipitation arrangement according to claim 2, wherein: 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.
6. A foundation pit precipitation arrangement according to claim 5, wherein: 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.
7. A pit precipitation arrangement according to claim 2, wherein: 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.
8. A pit precipitation arrangement according to claim 2, wherein: the settling pipe section adopts a metal pipe or a plastic pipe.
9. A pit precipitation arrangement according to claim 2, wherein: and a water outlet system and a gas injection system are respectively arranged in the foundation pit field, and 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 |
|---|---|---|---|
| CN201922159088.2U CN211498899U (en) | 2019-12-05 | 2019-12-05 | Foundation pit dewatering arrangement structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922159088.2U CN211498899U (en) | 2019-12-05 | 2019-12-05 | Foundation pit dewatering arrangement structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211498899U true CN211498899U (en) | 2020-09-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922159088.2U Active CN211498899U (en) | 2019-12-05 | 2019-12-05 | Foundation pit dewatering arrangement structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211498899U (en) |
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2019
- 2019-12-05 CN CN201922159088.2U patent/CN211498899U/en active Active
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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. |