CN109611053B - Pressure-stopping water plug for hydrogeological exploration and use method - Google Patents
Pressure-stopping water plug for hydrogeological exploration and use method Download PDFInfo
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- CN109611053B CN109611053B CN201910080180.1A CN201910080180A CN109611053B CN 109611053 B CN109611053 B CN 109611053B CN 201910080180 A CN201910080180 A CN 201910080180A CN 109611053 B CN109611053 B CN 109611053B
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- pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 6
- 230000006837 decompression Effects 0.000 claims description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 230000003139 buffering effect Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 2
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002627 tracheal intubation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sewage (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a pressure-stopping water plug for hydrogeological exploration and a use method thereof.
Description
Technical Field
The invention belongs to the technical field of hydrogeological exploration, and particularly relates to a pressure-stopping water plug for hydrogeological exploration.
Background
In hydrogeological exploration activities, in order to eliminate the influence of surface water on underground water or in order to eliminate the influence among various layers of underground water when multi-layer underground water appears, water stopping and water isolating work is required to be carried out on a designated position according to technical requirements after hole forming.
The Chinese patent publication No. CN205100933U is named as a pressurized water stopping plug for hydrogeological exploration, which comprises a central tube and trays arranged at two ends of the outer side of the central tube, wherein an expansion rubber ring is arranged between the two trays. However, the existing pressure-stopping water plug also has the problems that the water pressure can not be relieved when the pressure-stopping water plug is just inserted, mud residues in water can enter a pipeline, and the water plug is inconvenient to fix.
Therefore, it is necessary to design a pressure-stopping water plug for hydrogeological exploration.
Disclosure of Invention
The invention aims to provide a pressure-stopping water plug for hydrogeological exploration and a use method thereof, so as to solve the problems that the existing pressure-stopping water plug can not relieve water pressure when being just inserted, mud residues in water can enter a pipeline and the water plug is inconvenient to fix.
The invention is realized in the following way:
the utility model provides a hydrogeological exploration is with stopping pressurized water stopper, includes the straight tube, is convenient for fixed mounting head structure, buffering water pressure intubate structure, prevents mud residue filter seat structure, tray, inflation rubber circle, semicircle ring, U type seat, fixing bolt, violently pipe, handle, screw rod, clamp splice, handspike and skid resistant course, the fixed mounting head structure of being convenient for connect in the outer wall upside of straight tube; the buffer water pressure cannula structure is connected to the inside of the straight pipe; the mud residue prevention filter seat structure is connected to the lower side of the outer wall of the straight pipe; the buffer water pressure insertion pipe structure is connected to the inner side of the clamping block; the inside of the tray is respectively connected with the upper side and the lower side of the outer wall of the straight pipe in a threaded manner; the inner sides of the trays are respectively glued on the upper side and the lower side of the expansion rubber ring; the expansion rubber ring is sleeved at the middle position of the outer wall of the straight pipe; the inner side of the semicircular ring is sleeved on the upper side of the outer wall of the straight pipe; the left side and the right side of the semicircular ring are respectively fixed on the inner side of the U-shaped seat through fixing bolts; the inner sides of the transverse pipes respectively penetrate through the lower parts of the left side and the right side of the straight pipes; the joint of the transverse pipe and the straight pipe is in threaded connection; the middle positions of the inner sides of the handles are respectively connected with the outer sides of the screw rods through bolts; the inner sides of the screws respectively penetrate through the inner parts of the transverse pipes; the middle positions of the outer sides of the clamping blocks are respectively connected with the inner sides of the screw rods through bolts; the lower part of the inner side of the hand lever is respectively connected with the upper ends of the left side and the right side of the straight pipe through bolts; the anti-slip layer is glued on the upper part of the outer wall of the hand lever; the joint of the screw rod and the transverse pipe is in threaded connection; the structure of the convenient-to-fix mounting head comprises a circular threaded through hole, a mounting plate, a threaded hole, a handle, an external threaded rod and a conical head, wherein the circular threaded through hole is formed in the middle position inside the mounting plate; the threaded holes are respectively formed in the left side and the right side of the inside of the mounting plate; the middle position of the lower part of the grip is connected with the upper part of the external threaded rod through a bolt; the upper part of the conical head is in threaded connection with the lower part of the external threaded rod; the lower part of the external threaded rod penetrates through the inside of the threaded hole.
Preferably, the anti-slip layer is a plastic layer.
Preferably, the upper side of the outer wall of the straight pipe is in threaded connection with the inside of the circular threaded through hole.
Preferably, the buffering water pressure intubation structure comprises a rotating handle, a plug head, a hoop, a pressure reducing pipe, a circular through hole and a funnel-shaped head, wherein the middle position of the lower part of the rotating handle is connected with the upper part of the plug head through a bolt; the lower part of the plug is connected with the upper side of the interior of the decompression pipe in a threaded manner; the joint of the plug and the decompression pipe is fixed through a hoop; the circular through holes are respectively formed in the upper parts of the left side and the right side of the decompression tube from top to bottom in sequence; the upper part of the funnel-shaped head is connected with the lower part of the decompression tube in a threaded manner.
Preferably, the decompression tube is inserted into the straight tube, and the lower part of the decompression tube is clamped and fixed by the clamping blocks.
Preferably, the pressure reducing pipe is a stainless steel pipe.
Preferably, the mud residue preventing filter seat structure comprises a connecting plate, a circular opening, a spring, a buffer block, a mud guard and a filter screen, wherein the circular opening is formed in the middle position inside the connecting plate; the upper parts of the springs are respectively connected with the left side and the right side of the lower part of the connecting plate through bolts; the upper part of the buffer block is connected with the lower part of the spring through a bolt; the left side and the right side of the upper part of the mud guard are respectively connected with the lower part of the buffer block through bolts; the filter screen inlay in the inside intermediate position of fender.
Preferably, the lower side of the outer wall of the straight pipe is in threaded connection with the inside of the circular opening.
Preferably, the mud guard is made of stainless steel plate.
Preferably, the filter screen specifically adopts a stainless steel screen.
Preferably, the buffer block is a rubber block.
Preferably, the upper part of the straight pipe penetrates through the inside of the circular threaded through hole.
Preferably, the lower part of the decompression pipe penetrates through the lower side of the inside of the straight pipe.
Compared with the prior art, the invention has the following outstanding substantive features and remarkable progress:
in the invention, the arrangement of the rotating handle, the plug head, the anchor ear, the pressure reducing pipe, the circular through hole and the funnel-shaped head is beneficial to avoiding excessive water pressure when the water plug is inserted. The setting of connecting plate, circular trompil, spring, buffer block, fender and filter screen is favorable to preventing that mud sediment from getting into the relief pressure pipe. The arrangement of the circular threaded through hole, the mounting plate, the threaded hole, the handle, the external threaded rod and the conical head is beneficial to fixing the water plug. The setting of the hand lever is favorable to lifting the water plug to move. The arrangement of the transverse tube, the handle, the screw and the clamping blocks is beneficial to fixing and detaching the decompression tube. The semicircular ring, the U-shaped seat, the fixing bolt and the transverse tube are arranged, so that the compression and expansion rubber ring is facilitated. The anti-slip layer is beneficial to preventing hand slip. In addition, the arrangement of the tray and the expansion rubber ring is favorable for water stop.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the present invention which facilitates securing of the mounting head structure.
Fig. 3 is a schematic structural view of the buffering hydraulic cannula structure of the present invention.
Fig. 4 is a schematic structural view of the sludge-proof filter base structure of the present invention.
Reference numerals illustrate: 1-a straight pipe; 2-facilitating the fixing of the mounting head structure; 21-a circular threaded through hole; 22-mounting plates; 23-a threaded hole; 24-grip; 25-an external threaded rod; 26-conical head; 3-buffering a hydraulic cannula structure; 31-rotating handle; 32-plugs; 33-anchor ear; 34-a pressure reducing tube; 35-circular through holes; 36-a funnel-shaped head; 4-a mud residue prevention filter seat structure; 41-connecting plates; 42-circular openings; 43-spring; 44-buffer blocks; 45-mud guard; 46-a filter screen; 5-a tray; 6-expanding a rubber ring; 7-semicircle ring; 8-U-shaped seats; 9-fixing bolts; 10-horizontal tube; 11-a handle; 12-screw; 13-clamping blocks; 14-a hand lever; 15-an anti-slip layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention relates to a pressure-stopping water plug for hydrogeological exploration, which comprises a straight pipe 1, a convenient fixed mounting head structure 2, a buffer water pressure insertion pipe structure 3, a sludge-preventing filter seat structure 4, a tray 5, an expansion rubber ring 6, a semicircular ring 7, a U-shaped seat 8, a fixing bolt 9, a transverse pipe 10, a handle 11, a screw rod 12, a clamping block 13, a hand rod 14 and an anti-slip layer 15, wherein the convenient fixed mounting head structure 2 is connected to the upper side of the outer wall of the straight pipe 1; the buffer water pressure cannula structure 3 is connected to the inside of the straight pipe 1; the mud residue prevention filter seat structure 4 is connected to the lower side of the outer wall of the straight pipe 1; the buffer water pressure cannula structure 3 is connected to the inner side of the clamping block 13; the inside of the tray 5 is respectively connected with the upper side and the lower side of the outer wall of the straight pipe 1 in a threaded manner; the inner side of the tray 5 is respectively glued on the upper side and the lower side of the expansion rubber ring 6; the expansion rubber ring 6 is sleeved at the middle position of the outer wall of the straight pipe 1; the inner side of the semicircular ring 7 is sleeved on the upper side of the outer wall of the straight pipe 1; the left side and the right side of the semicircular ring 7 are respectively fixed on the inner side of the U-shaped seat 8 through fixing bolts 9; the inner sides of the transverse pipes 10 respectively penetrate through the lower parts of the left side and the right side of the straight pipe 1; the joint of the transverse pipe 10 and the straight pipe 1 is in threaded connection.
The middle positions of the inner sides of the handles 11 are respectively connected with the outer sides of the screw rods 12 through bolts; the inner sides of the screw rods 12 respectively penetrate through the inner parts of the transverse pipes 10; the middle positions of the outer sides of the clamping blocks 13 are respectively connected with the inner sides of the screw rods 12 through bolts; the lower part of the inner side of the hand lever 14 is respectively connected with the upper ends of the left side and the right side of the straight pipe 1 by bolts; the anti-slip layer 15 is glued on the upper part of the outer wall of the hand lever 14; the joint of the screw rod 12 and the transverse pipe 10 is in threaded connection; the structure 2 for conveniently fixing the mounting head comprises a circular threaded through hole 21, a mounting plate 22, a threaded hole 23, a grip 24, an external threaded rod 25 and a conical head 26, wherein the circular threaded through hole 21 is formed in the middle position inside the mounting plate 22; threaded holes 23 are respectively formed in the left and right sides of the interior of the mounting plate 22; the middle position of the lower part of the handle 24 is connected with the upper part of the external threaded rod 25 through a bolt; the upper part of the conical head 26 is connected with the lower part of the external threaded rod 25 in a threaded way; the lower portion of the male screw rod 25 penetrates the inside of the screw hole 23.
In the above embodiment, the anti-slip layer 15 is specifically a plastic layer. The upper side of the outer wall of the straight pipe 1 is screwed inside the circular screw through hole 21. The buffer water pressure intubation structure 3 comprises a rotating handle 31, a plug head 32, a hoop 33, a pressure reducing pipe 34, a circular through hole 35 and a funnel-shaped head 36, wherein the middle position of the lower part of the rotating handle 31 is connected with the upper part of the plug head 32 through bolts; the lower part of the plug 32 is connected with the upper side of the interior of the decompression tube 34 in a threaded manner; the joint of the plug head 32 and the decompression tube 34 is fixed by a hoop 33; the circular through holes 35 are respectively formed at the upper parts of the left side and the right side of the decompression tube 34 from top to bottom in sequence; the upper portion of the funnel-shaped head 36 is screwed to the lower portion of the pressure reducing tube 34.
In addition, the decompression tube 34 is inserted into the straight tube 1, and the lower part of the decompression tube 34 is clamped and fixed by the clamping blocks 13. The pressure reducing pipe 34 is specifically a stainless steel pipe. The mud residue prevention filter seat structure 4 comprises a connecting plate 41, a circular opening 42, a spring 43, a buffer block 44, a mud guard 45 and a filter screen 46, wherein the circular opening 42 is formed in the middle position inside the connecting plate 41; the upper part of the spring 43 is respectively connected with the left side and the right side of the lower part of the connecting plate 41 by bolts; the upper part of the buffer block 44 is connected with the lower part of the spring 43 through bolts; the left and right sides of the upper part of the mud guard 45 are respectively connected with the lower part of the buffer block 44 by bolts; the filter screen 46 is inlaid in the middle position inside the mud guard 45. The lower side of the outer wall of the straight pipe 1 is in threaded connection with the inside of the circular opening 42. The mud guard 45 is specifically made of stainless steel. The filter screen 46 is specifically a stainless steel screen. The buffer block 44 is a rubber block. The upper portion of the straight pipe 1 penetrates the inside of the circular threaded through hole 21. The lower portion of the pressure reducing pipe 34 penetrates the inside lower side of the straight pipe 1.
The invention is implemented as follows:
in the invention, by inserting the mud guard 45 and the straight pipe 1 into the drill hole, water flow can enter the decompression pipe 34 through the funnel-shaped head 36 and then flow into the straight pipe 1 through the circular through hole 35, so that the buffering force on water pressure is increased in the process, and the water plug can be easily inserted into the drill hole; the semicircular ring 7 is opened by loosening the fixing bolts 9, and the expansion rubber ring 6 expands after meeting water, so that water is stopped; the filter screen 46 can prevent mud and slag in water from entering the interior of the pressure reducing pipe 34; the grip 24 is held by hand, the male screw rod 25 is rotated, and the conical head 26 is inserted into the ground, thereby fixing the water plug.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. The pressure-stopping water plug for hydrogeological exploration is characterized by comprising a straight pipe (1), a convenient fixed mounting head structure (2), a buffering water pressure insertion pipe structure (3), a mud residue-preventing filtering seat structure (4), a tray (5), an expansion rubber ring (6), a semicircular ring (7), a U-shaped seat (8), a fixing bolt (9), a transverse pipe (10), a handle (11), a screw (12), a clamping block (13), a hand lever (14) and an anti-skid layer (15), wherein the convenient fixed mounting head structure (2) is connected to the upper side of the outer wall of the straight pipe (1); the buffer water pressure cannula structure (3) is connected to the inside of the straight pipe (1); the mud residue prevention filter seat structure (4) is connected to the lower side of the outer wall of the straight pipe (1); the buffer water pressure insertion pipe structure (3) is connected to the inner side of the clamping block (13); the trays (5) are respectively connected to the outer walls of the upper side and the lower side of the straight pipe (1) in a threaded manner; the inner sides of the trays (5) are respectively glued on the upper side and the lower side of the expansion rubber ring (6); the expansion rubber ring (6) is sleeved at the middle position of the outer wall of the straight pipe (1); the inner side of the semicircular ring (7) is sleeved on the upper side of the outer wall of the straight pipe (1); the left side and the right side of the semicircular ring (7) are respectively fixed on the inner side of the U-shaped seat (8) through fixing bolts (9); the transverse pipe (10) penetrates through the lower parts of the left side and the right side of the straight pipe (1) respectively, and the joint of the transverse pipe (10) and the straight pipe (1) is in threaded connection; the middle position of the inner side of the handle (11) is respectively connected with the outer side of the screw rod (12) through bolts; the inner sides of the screw rods (12) respectively penetrate through the inner parts of the transverse pipes (10); the middle positions of the outer sides of the clamping blocks (13) are respectively connected with the inner sides of the screw rods (12) through bolts; the lower part of the inner side of the hand lever (14) is respectively connected with the upper ends of the left side and the right side of the straight pipe (1) through bolts; the anti-slip layer (15) is glued on the upper part of the outer wall of the hand lever (14); the joint of the screw rod (12) and the transverse pipe (10) is in threaded connection; the convenient-to-fix mounting head structure (2) comprises a circular threaded through hole (21), a mounting plate (22), a threaded hole (23), a grip (24), an external threaded rod (25) and a conical head (26), wherein the circular threaded through hole (21) is formed in the middle position inside the mounting plate (22); the threaded holes (23) are respectively formed in the left side and the right side of the inside of the mounting plate (22); the middle position of the lower part of the handle (24) is connected with the upper part of the external threaded rod (25) through a bolt; the upper part of the conical head (26) is in threaded connection with the lower part of the external threaded rod (25); the lower part of the external threaded rod (25) penetrates through the inside of the threaded hole (23).
2. The pressure-stopping water plug for hydrogeological exploration according to claim 1, wherein the anti-slip layer (15) is specifically a plastic layer.
3. The pressurized water stopper for hydrogeological exploration according to claim 1, wherein the upper side of the outer wall of said straight tube (1) is screwed inside a circular threaded through hole (21).
4. The pressure-stopping water plug for hydrogeological exploration according to claim 1, wherein the buffer water pressure insertion pipe structure (3) comprises a rotating handle (31), a plug head (32), a hoop (33), a decompression pipe (34), a circular through hole (35) and a funnel-shaped head (36), and the middle position of the lower part of the rotating handle (31) is connected with the upper part of the plug head (32) through a bolt; the lower part of the plug head (32) is connected with the upper side of the interior of the decompression tube (34) in a threaded manner; the joint of the plug head (32) and the pressure reducing pipe (34) is fixed through a hoop (33); the circular through holes (35) are respectively formed at the upper parts of the left side and the right side of the decompression tube (34) from top to bottom in sequence; the upper part of the funnel-shaped head (36) is connected with the lower part of the decompression tube (34) in a threaded manner.
5. The pressure-stopping water plug for hydrogeological exploration according to claim 4, wherein the pressure-reducing pipe (34) is inserted into the straight pipe (1), and the lower part of the pressure-reducing pipe (34) is clamped and fixed by the clamping blocks (13).
6. The hydrogeological water stopper according to claim 4, wherein said pressure reducing tube (34) is embodied as a stainless steel tube.
7. The pressurized water stopper for hydrogeological exploration according to claim 1, wherein said sludge-proof filter seat structure (4) comprises a connecting plate (41), a circular opening (42), a spring (43), a buffer block (44), a mud guard (45) and a filter screen (46), said circular opening (42) being provided at an inner intermediate position of the connecting plate (41); the upper parts of the springs (43) are respectively connected with the left side and the right side of the lower part of the connecting plate (41) through bolts; the upper part of the buffer block (44) is connected with the lower part of the spring (43) through bolts; the left side and the right side of the upper part of the mud guard (45) are respectively connected with the lower part of the buffer block (44) through bolts; the filter screen (46) is embedded in the middle position inside the mud guard (45).
8. The pressure-stopping water plug for hydrogeological exploration according to claim 7, wherein the lower side of the outer wall of the straight pipe (1) is in threaded connection with the inside of the circular opening (42).
9. The hydrogeological water stopper according to claim 7, wherein said mud guard (45) is made of stainless steel.
10. A method of using a pressurized water stopper for hydrogeological exploration according to any of the claims 1-9, characterized in that by inserting the mud guard (45) and the straight pipe (1) inside the borehole, the water flow will enter the decompression pipe (34) through the funnel-shaped head (36) and then flow into the straight pipe (1) through the circular through hole (35); the semicircular ring (7) is opened by loosening the fixing bolts (9), and the expansion rubber ring (6) expands after meeting water, so that water is stopped; the mud residue in the water is prevented from entering the pressure reducing pipe (34) through the filtration of the filter screen (46); the grip (24) is held by hand, the male screw rod (25) is rotated, and the conical head (26) is inserted into the ground, thereby fixing the water plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910080180.1A CN109611053B (en) | 2019-01-28 | 2019-01-28 | Pressure-stopping water plug for hydrogeological exploration and use method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910080180.1A CN109611053B (en) | 2019-01-28 | 2019-01-28 | Pressure-stopping water plug for hydrogeological exploration and use method |
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| CN109611053A CN109611053A (en) | 2019-04-12 |
| CN109611053B true CN109611053B (en) | 2023-07-25 |
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| CN110331969B (en) * | 2019-06-14 | 2021-04-20 | 弗润联科(北京)石油科技有限公司 | Cross-isolation type oil testing and repeated fracturing tool system |
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| JP4827109B1 (en) * | 2011-03-09 | 2011-11-30 | 強化土株式会社 | Injection pipe device and ground injection method |
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| CN202416441U (en) * | 2012-02-15 | 2012-09-05 | 范立民 | Pipe shoe water stop device for water pumping test of water-bearing interval in hydrogeological exploration |
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Effective date of registration: 20240311 Address after: 550081 Xingshan Lake District, Guiyang, Guizhou Province, No. 16 Patentee after: CHINA HYDROPOWER CONSULTING GROUP GUIYANG SURVEY AND DESIGN INSTITUTE OF GEOTECHNICAL ENGINEERING Co.,Ltd. Country or region after: China Patentee after: POWERCHINA GUIYANG ENGINEERING CORPORATION LIMITED Address before: 550081 Xingshan Lake District, Guiyang, Guizhou Province, No. 16 Patentee before: POWERCHINA GUIYANG ENGINEERING CORPORATION LIMITED Country or region before: China |