CN114526950A - Underground water layering stagnant water sampling device - Google Patents
Underground water layering stagnant water sampling device Download PDFInfo
- Publication number
- CN114526950A CN114526950A CN202210174341.5A CN202210174341A CN114526950A CN 114526950 A CN114526950 A CN 114526950A CN 202210174341 A CN202210174341 A CN 202210174341A CN 114526950 A CN114526950 A CN 114526950A
- Authority
- CN
- China
- Prior art keywords
- water
- pipe
- outer diameter
- waterproof
- water stop
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an underground water layering water stopping sampling device which comprises a perforated pipe, a water stopping pipe, a pressure pipe and a water resisting pipe, wherein the surface of the perforated pipe is provided with air holes, and the water stopping pipe is provided with a water preventing rib, a water absorbing expansion material and a permeable membrane. Put into downthehole simultaneously through threaded connection with several floral tubes, connect the stagnant water pipe at the floral tube top when many floral tubes total length and marine barrier are unanimous or are close to the hole bottom distance, connect the pressure pipe at stagnant water pipe top, connect several marine barriers at the pressure pipe top until the device reachs the hole bottom. The whole water stopping device is rotated, the stress of the device enables the pressure pipe and the top thread of the water stopping pipe to be fully closed, the pressure pipe extrudes the top structure of the water stopping pipe, and the waterproof rib outside the water stopping pipe is opened in an umbrella shape. Groundwater makes its inflation through the one-way osmotic membrane contact swelling material that absorbs water, until with the complete shutoff in water barrier position, cuts off upper and lower aquifer passageway, and accessible device inside volume groundwater level or water sampling.
Description
Technical Field
The invention relates to the technical field of underground water monitoring, in particular to an underground water layering water stopping sampling device.
Background
Due to the fact that geological activities for a long time and the complex stratum structures and causes, the water permeability of each stratum is different, the stratum is divided into a water-bearing layer and a relative water-resisting layer according to the water permeability, and the condition of the water-bearing layer and the water-resisting layer can appear in partial areas.
Underground water monitoring usually requires drilling or water level observation and sampling detection of underground wells to obtain water level and water quality information of different depths and different aquifers. To different aquifers, for preventing each layer from forming hydraulic channel, influence monitoring and analysis effect, all need arrange a plurality of monitoring drilling usually, get the groundwater of different levels respectively and block up the water of other aquifers through the grout to every drilling, this kind of working method area is big, and the engineering time is long, the fund input is big, has caused a large amount of wastes.
Meanwhile, in order to improve the construction efficiency, the aperture of the existing drilling hole is generally changed according to the lithology of the stratum and is gradually reduced from top to bottom; and special geological phenomena such as bedrock falling, karst area karst cave and the like easily occur in the weathered rock area. The traditional water stopping device has larger size, generally just fits the size of the aperture, can not be changed according to actual conditions, and can not reach a specified position due to the influence of aperture change or rock fragments in the installation process under special working conditions.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides the underground water layering and water stopping sampling device which is simple to operate, low in cost, capable of improving the efficiency and capable of reducing repeated drilling work.
In order to solve the technical problems, the invention adopts the technical scheme that: a layered water-stop sampling device for underground water comprises a plurality of perforated pipes, a water-stop pipe, a pressure pipe and a plurality of marine risers, which are provided with drift diameters and are connected in a threaded manner in sequence from bottom to top;
the bottom of the perforated pipe is provided with external threads, the top of the perforated pipe is provided with internal threads, and the outer wall of the perforated pipe is provided with a plurality of holes;
the middle upper part of the outer side of the water stop pipe is a small outer diameter, the lower part of the outer side of the water stop pipe is a large outer diameter which is the same as the outer diameter of the floral tube, the upper part of the small outer diameter and the lower part of the large outer diameter are both provided with external threads, a circle of rolling shaft is arranged along the outer edge of a step formed at the joint of the small outer diameter and the large outer diameter, the rolling shaft is hinged with a plurality of waterproof ribs which are vertically arranged in sequence to form a water stop pipe small outer diameter outer wall interlayer, the outer wall of the small outer diameter interlayer is the same as the outer diameter of the floral tube, the peripheral edge of the inner side of each waterproof rib is hermetically fixed with a permeable membrane, a water absorption expansion material is filled between the permeable membrane and the waterproof ribs, the permeable membrane is folded and is opened along with the expansion of the water absorption expansion material, the plurality of waterproof ribs can be opened in a fan shape by taking the rolling shaft as the center, a water stop rubber ring is sleeved in the middle part of the external threads of the small outer side of the small outer diameter upper part of the water stop rubber ring, the waterproof ribs are wax-sealed, when the waterproof ribs are closed, the top is sealed by a water-sealing rubber ring;
the bottom and the top of the pressure pipe are both provided with internal threads;
the bottom of the riser is provided with external threads, and the top of the riser is provided with internal threads.
The top of the waterproof rib is provided with an inner chamfer, the periphery of the inner side of the waterproof rib is provided with a groove, and the permeable membrane is embedded and fixed in the groove.
The outer wall of the bottom surface of the pressure pipe is provided with an outer chamfer matched with the inner chamfer on the waterproof rib, so that the pressure pipe extrudes the waterproof rib to be opened in an umbrella shape when rotating downwards.
The permeable membrane is a unidirectional permeable membrane.
The invention has the beneficial effects that: the device is suitable for covering layers, weathered rocks and rock stratums of karst areas, prevents hydraulic connection among different aquifers, prevents underground water from being connected in series, achieves the effect of permanent plugging, and can measure and sample the water levels of a plurality of aquifers.
Drawings
Fig. 1 is a schematic structural view of a groundwater laminar water stop sampling device of the present invention.
Fig. 2 is a schematic structural view of a water stop pipe of the groundwater layered water stop sampling device of the invention.
Fig. 3 is a cross-sectional view of a waterproof rib of the groundwater table water stop sampling device of the present invention.
Fig. 4 is a schematic view of the opening and expansion of the waterproof rib of the groundwater stratification water stop sampling device of the invention.
FIG. 5 is a schematic diagram of the operation of the groundwater stratification water stop sampling device of the present invention.
Detailed Description
The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-4, the groundwater layering and water stopping sampling device of the invention comprises a plurality of perforated pipes 1, a water stopping pipe 2, a pressure pipe 3 and a plurality of marine riser pipes 4 which are provided with drift diameters and are connected in a threaded manner in sequence from bottom to top; the bottom of the perforated pipe 1 is provided with external threads, the top of the perforated pipe is provided with internal threads, and the outer wall of the perforated pipe is provided with a plurality of holes 5; the middle upper part of the outer side of the water stop pipe 2 is a small outer diameter, the lower part of the outer side of the water stop pipe 2 is a large outer diameter which is the same as the outer diameter of the floral pipe 1, the upper part of the small outer diameter and the lower part of the large outer diameter are both provided with external threads, a circle of rolling shaft is arranged along the outer edge of a step formed at the joint of the small outer diameter and the large outer diameter, a plurality of waterproof ribs 6 are sequentially and vertically arranged on the rolling shaft to form a small outer diameter outer wall interlayer of the water stop pipe 2, the outer wall of the small outer diameter interlayer is the same as the outer diameter of the floral pipe 1, a permeable membrane 7 is fixed at the peripheral edge of the inner side of each waterproof rib 6 in a sealing way, a water absorbing expansion material 8 is filled between the permeable membrane 7 and the waterproof rib 6, the permeable membrane 7 is folded and is opened along with the expansion of the water absorbing expansion material 8, the plurality of waterproof ribs 6 can be opened in a fan shape by taking the rolling shaft as the center, a water stop rubber ring 9 is sleeved in the middle part of the external threads of the upper part of the small outer diameter, when the waterproof ribs 6 are closed, the top is positioned below the water stop rubber ring 9, and the outer sides and the bottom of the plurality of the waterproof ribs 6 are sealed, the top is sealed by a water-sealing rubber ring 9; the bottom and the top of the pressure pipe 3 are both provided with internal threads; the riser 4 has an external thread at the bottom and an internal thread at the top.
Preferably, the top of waterproof rib 6 has interior chamfer, has the recess around the waterproof rib 6 inboard, and osmotic membrane 7 embedding is fixed in the recess, 3 bottom surface outer walls of manometer pipe have with the outer chamfer of interior chamfer assorted on the waterproof rib 6, extrude waterproof rib 6 and become the umbelliform and open when making manometer pipe 3 rotate downwards.
Preferably, the permeable membrane 7 is a unidirectional permeable membrane.
Specifically, the sampling tube of the floral tube 1 is provided with a hole 5, so that the groundwater can enter conveniently and the air pressure can be reduced. The bottom of the waterproof rib 6 can be connected to the water stop pipe 2 through threads; the top, bottom and outer side surfaces of the waterproof rib 6 are adhered to each other or wax-sealed in an unopened state to have a sealing effect. The water stop pipe 2 can be pressed by the pressure pipe 3 to open the water stop rib 6. The water-absorbing expansion material 8 has a large water-absorbing and water-retaining rate. The permeable membrane 7 can realize a one-way water permeable function. The permeable membrane 7 is folded and embedded into the edge of the waterproof rib 6, the outer edge of the permeable membrane 7 is fixed, and the surface can be opened along with the expansion of the water-absorbing expansion material 8. The expansion range of the waterproof ribs 6 is not fixed, and the waterproof ribs can reach the hole wall under the action of gravity after being expanded.
As shown in figure 5, the distribution positions and the distances from aquifers to the hole bottom are known in the previous exploration work, a plurality of floral tubes 1 are simultaneously placed into a hole through threaded connection, a water stop pipe 2 is connected to the top of the floral tube 1 when the total length of the floral tubes 1 is consistent with or close to the distance from the water barrier to the hole bottom, a pressure pipe 3 is connected to the top of the water stop pipe 2, and a water barrier pipe 4 is connected to the top of the pressure pipe 3 until the device reaches the hole bottom. Rotatory whole sealing device, the device atress makes pressure pipe 3 and 2 top threads of stagnant water pipe fully closed, and pressure pipe 3 forms the extrusion to 2 top structures of stagnant water pipe, makes stagnant water rubber ring 9 break, and 6 surface adhesions of waterproof rib, bottom and stagnant water pipe 2 pass through the roller bearing articulated, are the umbelliform behind the atress and open. After the waterproof rib 6 is opened, the permeable membrane 7 is contacted with the external environment, the underground water is contacted with the water absorption expansion material 8 through the permeable membrane 7 to expand the permeable membrane until the waterproof layer is completely blocked, and the hydraulic connection between the upper water and the lower water is cut off. Groundwater enters the device through the air hole 5 in the perforated pipe 1, and after the plugging device is stabilized, the groundwater level or a water sample can be measured from the inside of the device through the rubber pipe.
Similarly, the same operations may be repeated for the second or more aquifers and the water barrier.
The action principle of the water-absorbing expansion material is as follows:
the sodium polyacrylate is a high molecular material and has a chemical formula of (C)3H3NaO2) And n, the solid state is white or light yellow block or powder, and the liquid state is colorless or light yellow viscous liquid. Is prepared from acrylic acid and its esters through aqueous solution polymerizing.
Its function isThe mechanism is as follows: the sodium polyacrylate is a slightly crosslinked polymer space network, and polymer chains of the sodium polyacrylate are mutually wound and crosslinked into a net structure. When the polymer encounters water, many of its surrounding dissociative groups (-COONa)+) Immediately dissociate into positively charged low molecular ions (Na)+) And negatively charged polymer ions. Low molecular ion (Na)+) The sodium polyacrylate moves by contacting with water and leaves the macromolecular ion chains, and the macromolecular network beams are gradually stretched (or swelled) from a mutual winding state due to mutual repulsion among the macromolecular ions with negative charges, so that osmotic pressure is generated inside and outside the network structure, and water molecules are diffused to the network structure in an osmotic mode to form sol, so that the sodium polyacrylate has strong water absorption. Meanwhile, the crosslinking network structure and the hydrogen bond action of the resin limit the infinite expansion of the gel.
When acrylic acid is used as a monomer, kaolin is used as a raw material, N, N' -methylene bisacrylamide is used as a cross-linking agent, ammonium persulfate and sodium bisulfite are used as initiators, the maximum water absorption rate of the sodium polyacrylate/kaolin composite super absorbent resin prepared by an aqueous solution polymerization method can reach over 900 times, and the water retention rate of the resin after 7 hours is more than 69% at the normal pressure of 40 ℃. Many sodium polyacrylate manufacturers are available, such as Zhengzhou Wanruda chemical products, Inc., Foshan Baiyao Australia Biotech, Inc., and Henan Wanshan New Material science and technology Inc.
By utilizing such properties of the water-swellable material, the water-containing layer can be stopped.
The permeable membrane adopts a one-way permeable membrane, the water flow direction is from outside to inside, and the action principle is as follows: the water permeable membrane is a composite fiber membrane consisting of two layers of structures, one layer is a hydrophilic material, and the other layer is a hydrophobic material, so that the effect of unidirectional liquid transmission can be achieved. When the nano-scale fiber membrane composed of hydrophilic polymers such as polyvinyl alcohol and polyacrylate is used as a hydrophilic layer and polyurethane, polystyrene, polycaprolactone and the like are used as hydrophobic layers, the nano-scale fiber membrane has excellent one-way water permeability.
The permeable membrane can be folded and installed in the water stop pipe to meet the requirement of larger expansion rate.
The principle of layered water stop: the object of the invention is to perform multiple aquifer monitoring and sampling through one borehole in areas where groundwater conditions are more complex. To achieve the aim, different aquifers need to be plugged and isolated, and hydraulic connection is avoided. And according to the exploration result, the positions or the depths of the drilling aquifer and the water-resisting layer are obtained, and plugging is carried out on the water-resisting layer so as to cut off the channel between different aquifers and lose hydraulic connection. Therefore, when monitoring or sampling is performed by the sampling devices, the sample obtained by each sampling device only represents the content of the current aquifer where the floral tube is located.
The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and to implement the present invention accordingly, but not to limit the scope of the present invention by only the embodiments, i.e. all equivalent changes or modifications made within the spirit of the present invention disclosed in the present invention still fall within the scope of the present invention.
Claims (4)
1. The underground water layering water stopping sampling device is characterized by comprising a plurality of perforated pipes (1), a water stopping pipe (2), a pressure pipe (3) and a plurality of marine riser pipes (4) which are provided with drift diameters and are connected in a threaded manner in sequence from bottom to top;
the bottom of the perforated pipe (1) is provided with external threads, the top of the perforated pipe is provided with internal threads, and the outer wall of the perforated pipe is provided with a plurality of holes (5);
the middle upper part of the outer side of the water stop pipe (2) is a small outer diameter, the lower part of the outer side of the water stop pipe is a large outer diameter which is the same as the outer diameter of the floral tube (1), the upper part of the small outer diameter and the lower part of the large outer diameter are both provided with external threads, a circle of rolling shaft is arranged along the outer edge of a step formed at the joint of the small outer diameter and the large outer diameter, a plurality of waterproof ribs (6) are hinged on the rolling shaft and vertically arranged in sequence to form a small outer diameter outer wall interlayer of the water stop pipe (2), the outer wall of the small outer diameter interlayer is the same as the outer diameter of the floral tube (1), a permeable membrane (7) is fixed at the peripheral edge of the inner side of each waterproof rib (6) in a sealing way, a water absorption expansion material (8) is filled between the permeable membrane (7) and the waterproof ribs (6), the permeable membrane (7) is folded and is opened along with the expansion of the water absorption expansion material (8), the plurality of the waterproof ribs (6) can be opened in a fan shape by taking the rolling shaft as the center, the external threads of the middle part of the upper part of the small outer diameter are sleeved with a water stop rubber ring (9), when the waterproof ribs (6) are closed, the top parts of the waterproof ribs are positioned below the water stop rubber ring (9), the outer sides and the bottom parts of the waterproof ribs (6) are sealed by wax, and water is stopped at the top parts of the waterproof ribs through the water stop rubber ring (9);
the bottom and the top of the pressure pipe (3) are both provided with internal threads;
the bottom of the riser (4) is provided with an external thread, and the top of the riser is provided with an internal thread.
2. The groundwater stratification water stop sampling device according to claim 1, wherein the top of the waterproof rib (6) is provided with an inner chamfer, the periphery of the inner side of the waterproof rib (6) is provided with a groove, and the permeable membrane (7) is embedded and fixed in the groove.
3. The groundwater stratification water stop sampling device according to claim 2, wherein the outer wall of the bottom surface of the pressure pipe (3) is provided with an outer chamfer matched with an inner chamfer on the waterproof rib (6), so that the pressure pipe (3) presses the waterproof rib (6) to be opened like an umbrella when rotating downwards.
4. The groundwater stratification water stop sampling device according to claim 1, the permeable membrane (7) being a unidirectional permeable membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210174341.5A CN114526950A (en) | 2022-02-24 | 2022-02-24 | Underground water layering stagnant water sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210174341.5A CN114526950A (en) | 2022-02-24 | 2022-02-24 | Underground water layering stagnant water sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114526950A true CN114526950A (en) | 2022-05-24 |
Family
ID=81625301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210174341.5A Pending CN114526950A (en) | 2022-02-24 | 2022-02-24 | Underground water layering stagnant water sampling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114526950A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6454001B1 (en) * | 2000-05-12 | 2002-09-24 | Halliburton Energy Services, Inc. | Method and apparatus for plugging wells |
| US20060124304A1 (en) * | 2003-12-11 | 2006-06-15 | Andreas Bloess | Method of creating a zonal isolation in an underground wellbore |
| DE102011085540B3 (en) * | 2011-11-01 | 2013-04-11 | Untergrundspeicher- Und Geotechnologie-Systeme Gmbh | Device for closing and opening borehole of well, has expansible anchor that is deformed in active state so that axial length of expansion anchor is shortened and radial diameter is widened |
| CN106769206A (en) * | 2017-01-17 | 2017-05-31 | 上格环境科技（上海）有限公司 | A kind of modularization underground water individual well multilayer identifies sampling system |
| CN109854202A (en) * | 2019-04-18 | 2019-06-07 | 河北冀水规划设计有限公司 | A kind of two-tube squash type layering water-stop |
| CN110847847A (en) * | 2019-11-13 | 2020-02-28 | 中国地质调查局武汉地质调查中心(中南地质科技创新中心) | Mechanical trigger type packer capable of repeatedly setting and unsetting |
| KR20210158625A (en) * | 2020-06-24 | 2021-12-31 | 한국원자력연구원 | Non-shrinkable packer device |
-
2022
- 2022-02-24 CN CN202210174341.5A patent/CN114526950A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6454001B1 (en) * | 2000-05-12 | 2002-09-24 | Halliburton Energy Services, Inc. | Method and apparatus for plugging wells |
| US20060124304A1 (en) * | 2003-12-11 | 2006-06-15 | Andreas Bloess | Method of creating a zonal isolation in an underground wellbore |
| DE102011085540B3 (en) * | 2011-11-01 | 2013-04-11 | Untergrundspeicher- Und Geotechnologie-Systeme Gmbh | Device for closing and opening borehole of well, has expansible anchor that is deformed in active state so that axial length of expansion anchor is shortened and radial diameter is widened |
| CN106769206A (en) * | 2017-01-17 | 2017-05-31 | 上格环境科技（上海）有限公司 | A kind of modularization underground water individual well multilayer identifies sampling system |
| CN109854202A (en) * | 2019-04-18 | 2019-06-07 | 河北冀水规划设计有限公司 | A kind of two-tube squash type layering water-stop |
| CN110847847A (en) * | 2019-11-13 | 2020-02-28 | 中国地质调查局武汉地质调查中心(中南地质科技创新中心) | Mechanical trigger type packer capable of repeatedly setting and unsetting |
| KR20210158625A (en) * | 2020-06-24 | 2021-12-31 | 한국원자력연구원 | Non-shrinkable packer device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES2762760B1 (en) | SEALING AND PACKAGING ELEMENT WITH A NON-INFLATABLE LAYER | |
| CN206223783U (en) | A kind of new sloping surface runoff field | |
| CN206627405U (en) | The double embolism original position injection pressure water penetration detectors of expansion type | |
| CN111912385B (en) | Long-acting supervision system for settlement of house | |
| CN107420100B (en) | Layered water pumping device and layered water pumping system | |
| CN114526950A (en) | Underground water layering stagnant water sampling device | |
| CN104318843B (en) | Artesian well water injection test device | |
| CN210037326U (en) | Underground water single-well multilayer identification sampling system | |
| CN214066629U (en) | Multilayer groundwater undisturbed monitoring device | |
| CN108982325A (en) | The antifouling barrier materials chemistry compatibility test device and method in underground | |
| CN110241801A (en) | Soil vacuum monitoring method and device under a kind of vacuum preloading sealing film | |
| CN202099807U (en) | Polyethylene small-caliber precipitation well point device | |
| CN111980044B (en) | Dewatering well structure for separating adjacent aquifers and method for backfilling outside well wall | |
| CN110439550B (en) | Tilting soil sampling system | |
| CN211230365U (en) | Time-sharing self-expansion bag type packer | |
| CN203376179U (en) | Underground water sampler | |
| CN108693218B (en) | Intelligent aggregate capable of sensing water content information inside hydraulic building | |
| CN215485948U (en) | Elastic water stopper | |
| CN110130419A (en) | A kind of cement mixing pile detection of construction quality device and method | |
| CN203096708U (en) | Preboring pressure meter, self-boring pressure meter and self-boring pressure equipment | |
| CN1115024A (en) | In-situ test instrument for soft rock expansion | |
| CN213779697U (en) | Confining pressure gradual change type rock-soil compression experimental equipment | |
| CN213985309U (en) | Measuring device for hydraulic engineering management | |
| CN219491053U (en) | Device for automatically keeping weight of soil covered on underground relic structure | |
| CN114548835B (en) | Urban water resource bearing capacity assessment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |