CN114263201A - Finished product self-flowing dewatering deep well pipe and construction method thereof - Google Patents
Finished product self-flowing dewatering deep well pipe and construction method thereof Download PDFInfo
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- CN114263201A CN114263201A CN202111588375.0A CN202111588375A CN114263201A CN 114263201 A CN114263201 A CN 114263201A CN 202111588375 A CN202111588375 A CN 202111588375A CN 114263201 A CN114263201 A CN 114263201A
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- 238000010276 construction Methods 0.000 title claims abstract description 40
- 238000001556 precipitation Methods 0.000 claims abstract description 71
- 239000004575 stone Substances 0.000 claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 87
- 239000000047 product Substances 0.000 claims description 32
- 238000012806 monitoring device Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 15
- 238000012216 screening Methods 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 11
- 239000002351 wastewater Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000004065 wastewater treatment Methods 0.000 claims description 6
- 239000012466 permeate Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 10
- 239000002002 slurry Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000011835 investigation Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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Abstract
The invention relates to the technical field of foundation pit dewatering construction, in particular to a finished self-flowing dewatering deep well pipe and a construction method thereof. The water-filtering type water-saving device comprises a submersible pump, a water-permeable lining and water-filtering fine stones, wherein the water-filtering fine stones are wrapped on the outer side of the water-permeable lining, and the submersible pump is installed at the bottom of the water-permeable lining. The construction method comprises geological exploration and pipeline investigation; installing auxiliary equipment; measuring the setting-out well-digging operation; hoisting and fixing the well pipe; precipitation operation and precipitation monitoring; and (4) dismantling the well pipe and cleaning. The invention has simple manufacture, is not influenced by the field, can be prefabricated in factories or manufactured on site, has simple and convenient construction, saves the construction period, can be recycled, is hoisted out from a precipitation well by a crane or a tower crane after the precipitation operation is finished, and can be recycled to other positions after residual slurry in PVC pipes and filter materials is cleaned.
Description
Technical Field
The invention relates to the technical field of foundation pit dewatering construction, in particular to a finished self-flowing dewatering deep well pipe and a construction method thereof.
Background
In the construction process of deep foundation pit engineering, in order to eliminate the damage of underground confined water to the bottom of a foundation pit and the influence on the construction process, the foundation pit is excavated to the front and the back, a site drilling self-flowing deep well is adopted, water is pumped in advance for 7-10 days by matching with a submersible pump, and the water level of the underground confined water is reduced to be below the excavation surface of the foundation pit.
The traditional self-flowing deep well construction process flow is as follows: drilling by a drilling machine; sinking a perforated PVC well pipe externally wrapped with a filter screen; backfilling graded sandstone around the well pipe as a filter material; sinking a submersible pump in the well pipe; the submersible pump pumps out water in the well pipe.
Traditional deep well work progress that flows automatically, owing to rely on the workman on-the-spot well drilling pipe laying, the unable reuse often of material that uses moreover, consequently appears in order to save the cost of filter material, often reduces the drilling diameter of former design in order to reduce the quantity of gradation grit, leads to flowing automatically that the deep well space is not enough, and the effect in the secret confined water infiltration well is poor.
According to the traditional construction sequence of the flowing deep well, a well pipe is firstly put down, then a filter material is backfilled, and the well pipe is extruded by the filter material and even directly attached to a soil wall due to the difficulty in controlling the backfilling uniformity and the impact of the filter material on the well pipe, so that slurry which is not filtered directly flows into the well pipe, and the flowing deep well is scrapped due to the fact that the slurry in the well pipe is silted up in time.
Disclosure of Invention
The invention provides a finished product artesian precipitation deep well pipe and a construction method thereof, aiming at standardizing a well pipe used for artesian deep wells to reduce construction cost and avoid the installation deflection of the well pipe caused by rough operation of construction.
The invention provides a finished product self-flowing precipitation deep well pipe and a construction method thereof, and adopts the following technical scheme:
the utility model provides a finished product gravity flow precipitation deep well pipe, includes the immersible pump, permeates water inside lining and the fine stone of drainage, it forms fixed whole with the fine stone of drainage to permeate water inside lining, the fixed parcel of the fine stone of drainage is in the inside lining outside of permeating water, the immersible pump is installed in the inside lining bottom of permeating water, it is provided with fine screen water strainer to permeate water between inside lining and the fine stone of drainage, the fine stone of drainage parcel has coarse screen water strainer, the coarse screen water strainer outside is close to the inside lining top of permeating water and is provided with hoist and mount frame.
By adopting the technical scheme, the water-filtering fine stones are wrapped by the coarse-screening water-filtering net and form an integral finished well pipe with the water-permeable lining, the cost can be reduced through recycling, and due to the finished product manufacturing, the standard can be formed to prevent the material consumption caused by work stealing during site construction, and the water-filtering fine stones manufactured by the finished product are laid uniformly and effectively to avoid the phenomena of deflection and non-uniformity caused by site installation.
Preferably, the inside turbidity monitoring devices and the water level monitoring devices that are provided with of inside lining that permeates water, turbidity monitoring devices and water level monitoring devices communication connection have monitoring devices.
Through adopting above-mentioned technical scheme, turbidity monitoring devices monitors the muddy degree of water, prevents that the water from too muddy and leading to the immersible pump to damage, and water level monitoring devices monitors the water level and changes for judge precipitation operation time, prevent simultaneously that the water level from crossing low excessively and leading to the immersible pump to expose on the surface of water and damage.
Preferably, the fine-screening water filter screen comprises a fine-mesh wire mesh layer and a three-layer plastic wire mesh layer.
Through adopting above-mentioned technical scheme, the pore wire netting of fine screen water strainer mainly used fixes the plastics silk screen, and three-layer plastics silk screen effectively filters aquatic impurity and pollutes water in the well.
Preferably, the drainage fines are mixed with a water permeable binder.
By adopting the technical scheme, the shape of the water-filtering fine stone mixed permeable adhesive is fixed or made into different shapes according to the requirements, and the uniformity of different components is ensured.
Preferably, the water-permeable lining is a PVC plastic pipe with water filtering holes, and the surface of the water-permeable lining is wavy.
Through adopting above-mentioned technical scheme, the PVC plastic tubing of wave shape enlarges the area of permeating water, improves the efficiency of precipitation operation.
A construction method of a finished product self-flowing precipitation deep well comprises the following construction steps:
the method comprises the following steps: surveying the underground geological condition of a construction site and checking underground pipelines;
step two: auxiliary facility preparation including electric power facilities, transportation facilities, control facilities, and wastewater treatment facilities including wastewater transportation facilities, wastewater storage facilities, wastewater treatment facilities, and wastewater discharge facilities;
step three: the method comprises the following steps of (1) determining a well drilling position through on-site measurement and setting out, performing deep well drilling operation, and arranging a support net on a deep well wall after the deep well drilling operation is completed;
step four: transporting the finished artesian precipitation deep well pipe to the site and hoisting the finished artesian precipitation deep well pipe into the drilled deep well, fixing the top of the finished artesian precipitation deep well pipe by using a fixing table after the finished artesian precipitation deep well pipe is placed in the deep well, and hoisting a submersible pump into the bottom of the finished artesian precipitation deep well pipe;
step five: switching on a power supply device and a water pipe to start precipitation operation, and continuously monitoring the turbidity and the water level change of the water body in the finished product self-flowing precipitation deep well pipe during precipitation;
step six: and after the precipitation is finished, the submersible pump is disassembled from the fixing table, and the finished product is lifted out of the self-flowing precipitation deep well pipe and cleaned.
Through adopting above-mentioned technical scheme, reduced traditional filler process, simplified the work progress and improved construction quality, avoided the buried pipe deviation that construction operation improper leads to, utilized finished product flowing precipitation deep well pipe to simplify the flowing precipitation deep well pipe installation process certainly, including the installation of some equipment in the well pipe, the support net prevents that the deep well from collapsing and destroying finished product flowing precipitation deep well pipe certainly.
Preferably, the underground geological conditions of the exploration construction site comprise underground water level, soil condition and water quality condition, and urban drainage system discharge, sewage treatment discharge or direct utilization discharge is selected according to the water quality condition.
By adopting the technical scheme, the water installation water quality condition pumped out in the precipitation operation is comprehensively utilized and properly treated, and the requirement on environmental protection is met.
Preferably, the finished artesian precipitation deep well pipe is used for measuring the well depth of the drilled deep well before being placed in the deep well, and the bedding stone is paved at the bottom of the deep well according to the length of the finished artesian precipitation deep well pipe.
By adopting the technical scheme, the finished artesian precipitation deep well pipe is of a fixed length, so that bedding stones need to be laid at the bottom after the deep well is drilled, and part of the top of the finished artesian precipitation deep well pipe can be reserved for fixing treatment.
Preferably, the finished product self-flowing precipitation deep well pipe is installed and fixed and then is subjected to well washing treatment, and clear water is filled into the finished product self-flowing precipitation deep well pipe and the well is washed by a pressure fan during the well washing treatment.
By adopting the technical scheme, the well washing operation needs to clean the well pipe until the sand is cleaned, and the normal operation of subsequent water pumping and monitoring is ensured.
Preferably, after the finished product is subjected to self-flowing precipitation deep well pipe well washing treatment, the top well mouth is capped by a capping cap.
By adopting the technical scheme, the water pollution in the well caused by external dust can be effectively prevented after capping treatment, and meanwhile, the construction hidden danger is reduced.
In summary, the invention has the following beneficial technical effects:
1. the fine water filtering stones are wrapped by the coarse-screening water filtering net and form an integral finished well pipe with the water permeable lining, the cost can be reduced through recycling, and due to the fact that finished products are manufactured, the standard can be formed, the work stealing and material reduction of site construction can be prevented, and the fine water filtering stones manufactured by the finished products are laid uniformly and effectively, and the phenomena of deflection and unevenness caused by site installation are avoided.
2. The traditional packing process is reduced, the construction process is simplified, the construction quality is improved, the deviation of buried pipes caused by improper construction operation is avoided, the finished product flowing precipitation deep well pipe is utilized to simplify the installation process of the flowing precipitation deep well pipe, and the support net prevents the deep well from collapsing and destroying the finished product flowing precipitation deep well pipe.
3. The invention has simple manufacture, is not influenced by the field, can be prefabricated in factories or manufactured on site, has simple and convenient construction, saves the construction period, can be recycled, is hoisted out from a precipitation well by a crane or a tower crane after the precipitation operation is finished, and can be recycled to other positions after residual slurry in PVC pipes and filter materials is cleaned.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of the mounting structure of the present invention;
description of reference numerals:
1. the water-permeable inner liner comprises a water-permeable inner liner, 2, a fine-screening water filter screen, 3, fine water-filtering stones, 4, a coarse-screening water filter screen, 40, a hoisting frame, 5, a submersible pump, 50, a monitoring device, 51, a water pipe, 6, a turbidity monitoring device, 7, a water level monitoring device, 8, a power supply device, 9, a fixed table, 10, a capping cover, 11, a supporting net, 12 and a bottom stone.
Detailed Description
The present invention is described in further detail below with reference to figures 1-3.
Example 1:
the embodiment of the invention discloses a finished product self-flowing precipitation deep well pipe, which is shown in figures 1 and 2 and comprises a submersible pump 5, a water-permeable lining 1 and water-filtering fine stones 3, wherein the water-permeable lining 1 and the water-filtering fine stones 3 form a fixed whole, the water-filtering fine stones 3 are fixedly wrapped on the outer side of the water-permeable lining 1, the submersible pump 5 is installed at the bottom of the water-permeable lining 1, a fine-screening water filter screen 2 is arranged between the water-permeable lining 1 and the water-filtering fine stones 3, a coarse-screening water filter screen 4 is wrapped on the water-filtering fine stones 3, and a hoisting frame 40 is arranged on the outer side of the coarse-screening water filter screen 4 and close to the top of the water-permeable lining 1.
A construction method of a finished product self-flowing precipitation deep well comprises the following construction steps:
the method comprises the following steps: surveying the underground geological condition of a construction site and checking underground pipelines;
step two: auxiliary facility preparation including electric power facilities, transportation facilities, control facilities, and wastewater treatment facilities including wastewater transportation facilities, wastewater storage facilities, wastewater treatment facilities, and wastewater discharge facilities;
step three: the method comprises the following steps of (1) determining a well drilling position through on-site measurement and setting out, performing deep well drilling operation, and arranging a support net on a deep well wall after the deep well drilling operation is completed;
step four: transporting the finished artesian precipitation deep well pipe to the site and hoisting the finished artesian precipitation deep well pipe into the drilled deep well, fixing the top of the finished artesian precipitation deep well pipe by using a fixing table 9 after the finished artesian precipitation deep well pipe is placed in the deep well, and hoisting a submersible pump 5 into the bottom of the finished artesian precipitation deep well pipe;
step five: switching on a power supply device 8 and a water pipe 51 to start precipitation operation, and continuously monitoring the turbidity and water level change of the water body in the finished product self-flowing precipitation deep well pipe during precipitation;
step six: and after the precipitation is finished, the submersible pump 5 is disassembled from the fixed table, and the finished product is lifted out of the self-flowing precipitation deep well pipe and cleaned.
Example 2:
on the basis of example 1, the following are added:
referring to fig. 1-3, a turbidity monitoring device 6 and a water level monitoring device 7 are arranged inside the water permeable liner 1, and the turbidity monitoring device 6 and the water level monitoring device 7 are in communication connection with a monitoring device 50.
The fine-screening water filter screen 2 comprises a layer of fine-hole iron wire mesh and a layer of three-layer plastic wire mesh.
The water-filtering fine stone 3 is mixed with a water-permeable adhesive.
The water-permeable lining 1 is a PVC plastic pipe with water filtering holes, and the surface of the water-permeable lining 1 is wavy.
The underground geological conditions of the exploration construction site comprise underground water level, soil condition and water quality condition, and urban drainage system discharge, sewage treatment discharge or direct utilization discharge are selected according to the water quality condition.
The finished artesian precipitation deep well pipe is used for measuring the well depth of the drilled deep well before being put into the deep well, and the bedding stone 12 is paved at the bottom of the deep well according to the length of the finished artesian precipitation deep well pipe.
And carrying out well washing treatment after the finished product self-flowing precipitation deep well pipe is installed and fixed, and pouring clear water into the finished product self-flowing precipitation deep well pipe and washing the well by using a pressure fan during the well washing treatment.
And after the finished product self-flowing precipitation deep well pipe well washing treatment, the top well mouth is capped by a capping cap 10.
Example 3
On the basis of the embodiment 2, the following steps are added:
the permeable lining is a PVC plastic pipe with the diameter of 300mm, and a deep well with the diameter of 600mm is drilled by adopting a mud wall protection drilling method when the deep well is drilled.
The coarse-screening water filter screen 4 is a 7-mesh iron wire screen, the fine-screening water filter screen 2 is 7-mesh iron wire screen in one layer, and the three-layer plastic wire screen is 60-mesh.
The water level monitoring device 7 is a hydraulic water level monitor and is arranged at the bottom of a flowing precipitation deep well pipe.
The power supply device 8 includes a leakage protection system.
The weather forecast is checked before precipitation operation, a period of time with good weather is selected as far as possible in the construction period, and heat preservation or temperature increase treatment is adopted when the temperature is low in winter.
A water pressure monitoring device is installed on the water pipe 51 to monitor the pumping pressure.
The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a finished product is from flowing precipitation deep well pipe, includes immersible pump (5), its characterized in that: the water-permeable water-saving pump is characterized by further comprising a water-permeable lining (1) and water-filtering fine stones (3), wherein the water-permeable lining (1) and the water-filtering fine stones (3) form a fixed whole, the water-filtering fine stones (3) are fixedly wrapped on the outer side of the water-permeable lining (1), and the submersible pump (5) is installed at the bottom of the water-permeable lining (1);
a fine-screening water filtering net (2) is arranged between the water permeable lining (1) and the water filtering fine stone (3), and the water filtering fine stone (3) is wrapped with a coarse-screening water filtering net (4);
and a hoisting frame (40) is arranged on the outer side of the coarse-screening water filter screen (4) and close to the top of the water-permeable lining (1).
2. The finished free-flow dewatering deep well pipe according to claim 1, wherein: the inner liner (1) that permeates water is inside to be provided with turbidity monitoring devices (6) and water level monitoring devices (7), turbidity monitoring devices (6) and water level monitoring devices (7) communication connection have monitoring device (50).
3. The finished free-flow dewatering deep well pipe according to claim 1, wherein: the fine-screening water filtering net (2) comprises a layer of fine-hole iron wire net and three layers of plastic wire nets.
4. The finished free-flow dewatering deep well pipe according to claim 1, wherein: the water-filtering fine stone (3) is mixed with a water-permeable adhesive.
5. The finished free-flow dewatering deep well pipe according to claim 1, wherein: the water-permeable lining (1) is a PVC plastic pipe with water filtering holes, and the surface of the water-permeable lining (1) is wavy.
6. A finished product self-flowing dewatering deep well construction method is characterized in that: the method comprises the following construction steps:
the method comprises the following steps: surveying the underground geological condition of a construction site and checking underground pipelines;
step two: auxiliary facility preparation including electric power facilities, transportation facilities, control facilities, and wastewater treatment facilities including wastewater transportation facilities, wastewater storage facilities, wastewater treatment facilities, and wastewater discharge facilities;
step three: the method comprises the following steps of (1) determining a well drilling position through on-site measurement and setting out, performing deep well drilling operation, and arranging a support net on a deep well wall after the deep well drilling operation is completed;
step four: the finished artesian precipitation deep well pipe is transported to the site and is hoisted into the drilled deep well, after the finished artesian precipitation deep well pipe is placed, the top of the finished artesian precipitation deep well pipe is fixed by a fixing table (9), and a submersible pump (5) is hoisted into the bottom of the finished artesian precipitation deep well pipe;
step five: switching on a power supply device (8) and a water pipe (51) to start precipitation operation, and continuously monitoring the turbidity and the water level change of the water body in the finished product self-flowing precipitation deep well pipe during precipitation;
step six: and after precipitation is finished, the submersible pump (5) is disassembled from the fixed table, and the finished product is lifted out of the self-flowing precipitation deep well pipe and cleaned.
7. The method for constructing the finished self-flowing dewatering deep well according to claim 6, characterized in that: the underground geological conditions of the exploration construction site comprise underground water level, soil condition and water quality condition, and urban drainage system discharge, sewage treatment discharge or direct utilization discharge are selected according to the water quality condition.
8. The method for constructing the finished self-flowing dewatering deep well according to claim 6, characterized in that: the finished artesian precipitation deep well pipe is used for measuring the well depth of the drilled deep well before being put into the deep well, and the bedding stone (12) is paved at the bottom of the deep well according to the length of the finished artesian precipitation deep well pipe.
9. The method for constructing the finished self-flowing dewatering deep well according to claim 6, characterized in that: and carrying out well washing treatment after the finished product self-flowing precipitation deep well pipe is installed and fixed, and pouring clear water into the finished product self-flowing precipitation deep well pipe and washing the well by using a pressure fan during the well washing treatment.
10. The method for constructing the finished self-flowing precipitation deep well according to claim 9, wherein the method comprises the following steps: and after the finished product self-flowing precipitation deep well pipe well washing treatment, the top well mouth is capped through a capping cap (10).
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| CN202111588375.0A CN114263201A (en) | 2021-12-23 | 2021-12-23 | Finished product self-flowing dewatering deep well pipe and construction method thereof |
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| CN202111588375.0A CN114263201A (en) | 2021-12-23 | 2021-12-23 | Finished product self-flowing dewatering deep well pipe and construction method thereof |
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Citations (6)
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|---|---|---|---|---|
| JP2014234681A (en) * | 2013-06-04 | 2014-12-15 | 株式会社大林組 | Ground-water level lowering system |
| CN206706792U (en) * | 2017-04-28 | 2017-12-05 | 高创建设股份有限公司 | Deep foundation pit precipitation well construction |
| CN207277352U (en) * | 2017-10-13 | 2018-04-27 | 中建安装工程有限公司 | Slidingtype assembles pipe well drainage arrangement |
| CN111173017A (en) * | 2020-03-19 | 2020-05-19 | 中国二十二冶集团有限公司 | Water stopping device and water stopping method for concrete pouring at bottom of reverse operation well of cyclone well |
| CN212772427U (en) * | 2020-07-24 | 2021-03-23 | 开建环境建设集团有限公司 | Building construction foundation ditch drainage device |
| CN112554215A (en) * | 2020-12-11 | 2021-03-26 | 浙江省建工集团有限责任公司 | Double-sleeve artesian deep well precipitation construction method and structure for muddy silty clay with silty soil geology |
-
2021
- 2021-12-23 CN CN202111588375.0A patent/CN114263201A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014234681A (en) * | 2013-06-04 | 2014-12-15 | 株式会社大林組 | Ground-water level lowering system |
| CN206706792U (en) * | 2017-04-28 | 2017-12-05 | 高创建设股份有限公司 | Deep foundation pit precipitation well construction |
| CN207277352U (en) * | 2017-10-13 | 2018-04-27 | 中建安装工程有限公司 | Slidingtype assembles pipe well drainage arrangement |
| CN111173017A (en) * | 2020-03-19 | 2020-05-19 | 中国二十二冶集团有限公司 | Water stopping device and water stopping method for concrete pouring at bottom of reverse operation well of cyclone well |
| CN212772427U (en) * | 2020-07-24 | 2021-03-23 | 开建环境建设集团有限公司 | Building construction foundation ditch drainage device |
| CN112554215A (en) * | 2020-12-11 | 2021-03-26 | 浙江省建工集团有限责任公司 | Double-sleeve artesian deep well precipitation construction method and structure for muddy silty clay with silty soil geology |
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Application publication date: 20220401 |