CN113027487A - Rich water tunnel tubular prestressing force concreties cementer - Google Patents
Rich water tunnel tubular prestressing force concreties cementer Download PDFInfo
- Publication number
- CN113027487A CN113027487A CN202110326695.2A CN202110326695A CN113027487A CN 113027487 A CN113027487 A CN 113027487A CN 202110326695 A CN202110326695 A CN 202110326695A CN 113027487 A CN113027487 A CN 113027487A
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- Prior art keywords
- tubular
- grouting device
- consolidation grouting
- water
- pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000007596 consolidation process Methods 0.000 claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 239000004567 concrete Substances 0.000 claims abstract description 28
- 238000009412 basement excavation Methods 0.000 claims abstract description 19
- 239000011440 grout Substances 0.000 claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 12
- 239000007921 spray Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 27
- 238000005507 spraying Methods 0.000 abstract description 16
- 239000011435 rock Substances 0.000 description 18
- 238000005553 drilling Methods 0.000 description 14
- 239000004568 cement Substances 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a water-rich tunnel tubular prestress consolidation grouting device, which is characterized in that: the device comprises a tubular prestress consolidation grouting device, an annular drainage blind ditch pipe, a longitudinal drainage blind ditch pipe, a reinforcing mesh, nano-spray concrete and a drainage hole; the tubular prestressed consolidation grouting device is firmly bound with the tubular prestressed consolidation grouting device through a reinforcing mesh, the annular blind drainage ditch pipe is arranged in the annular direction of the tunnel excavation, and the longitudinal blind drainage ditch pipe is connected with the annular blind drainage ditch pipe; the tubular prestress consolidation grouting device is composed of a steel tube, a sleeve, a wedge, a taper-shaped front end, a pipe head thread, a grout stopping ring and a steel base plate, wherein the front end is machined into the taper shape, and a nut is screwed on the rear end of the pipe head thread. The invention solves the problem that the conventional construction of the anchor rod and the concrete spraying of the water-rich tunnel cannot be normally carried out, accelerates the construction progress and reduces the investment of subsequent water seepage treatment.
Description
Technical Field
The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a water-rich tunnel tubular prestress consolidation grouting device.
Background
In the construction of hydraulic and hydroelectric engineering, various functional or structural natural excavation supporting formed tunnels exist, for example, a traffic tunnel, a main transformer transportation tunnel, a main plant, a main transformer tunnel and the like in hydraulic and hydroelectric engineering are entered into, lining construction is not carried out after excavation anchor spraying supporting of the tunnels is finished generally, and an anti-seepage effect is achieved by concrete spraying supporting. Often in the stock and spout concrete construction because surrounding rock infiltration and spout concrete self structure not closely knit, there is great hole between the concrete structure granule, and the fillability in hole is poor, the connectivity is good, infiltration leaks along rock drilling under external surrounding rock pressure-bearing pressure, the surrounding rock crack permeates the excavation shaping surface, and permeate to the shotcrete surface along spouting the concrete hole, it can't go on to lead to the unable slip casting installation of the conventional stock of tunnel and spout ordinary concrete, and the face infiltration scheduling problem still appears after spouting the concrete, it is great and the outward appearance image is relatively poor to cause traffic safety hidden danger, probably there is the safe operation that influences hydroelectric engineering unit and equipment, and the manual work and the material that follow-up processing infiltration input are more, cause certain wasting of resources, and increased secondary construction cost. Therefore, how to overcome the defects of the prior art is a problem to be solved urgently in the technical field of hydraulic and hydroelectric engineering at present.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a tubular prestressed consolidation grouting device for a water-rich tunnel, which solves the problem that conventional construction of anchor rods and concrete spraying of the water-rich tunnel cannot be normally carried out, accelerates the construction progress, and reduces the investment of subsequent water seepage treatment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the method comprises the following steps of (1) arranging on a water-rich tunnel excavation surface: the device comprises a tubular prestress consolidation grouting device, an annular drainage blind ditch pipe, a longitudinal drainage blind ditch pipe, a reinforcing mesh, nano-spray concrete and a drainage hole; the tubular prestressed consolidation grouting device is firmly bound with the tubular prestressed consolidation grouting device through a reinforcing mesh, the annular blind drainage ditch pipe is arranged in the annular direction of the tunnel excavation, and the longitudinal blind drainage ditch pipe is connected with the annular blind drainage ditch pipe; the tubular prestress consolidation grouting device is formed by adding a sleeve and a wedge into a steel pipe, machining the front end into a cone, turning a wire at the rear end of a pipe head, adding a grout stopping ring and a steel base plate, and screwing a screw cap.
Furthermore, the tubular prestressed consolidation grouting device is arranged on a tunnel top arch and a side wall, the row spacing is 1.5m multiplied by 1.5m, and the arrangement is in a quincunx shape.
Furthermore, the diameter of the steel pipe of the tubular prestressed consolidation grouting device is phi 42 seamless steel pipe, the length is 6000mm, phi 16mm holes are drilled in the steel pipe, the hole spacing is 500mm, and the steel pipe is spirally arranged.
Furthermore, the end of the steel pipe of the tubular prestressed consolidation grouting device is threaded by 110mm, and 4 symmetrical wedges are welded at a position 360mm away from the end of the steel pipe.
Furthermore, an expansion steel sleeve is sleeved outside a wedge of the tubular prestress consolidation grouting device.
Furthermore, a square backing plate with holes is arranged outside the steel pipe threading section of the tubular prestress consolidation grouting device.
Furthermore, the inner side of the tubular prestress consolidation grouting device is provided with a grout stopping ring, and a backing plate is arranged below the grout stopping ring.
Furthermore, the blind ditch pipe for the inward drainage is connected with the blind ditch pipe for the longitudinal drainage through a four-way joint.
The method is applied to water seepage treatment construction of the rich tunnel, and when the hole forming construction of the anchor rod of the excavation surface of the rich tunnel is carried out, the tubular prestress consolidation grouting device is arranged in the hole, consolidation grouting is carried out along the tubular prestress device for seepage prevention, surface seepage and point seepage of the rich tunnel are blocked to a great extent, the traffic safety of the tunnel is ensured, the unit operates safely, and the appearance quality is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the device of the invention improves the prior water-rich tunnel seepage failure to carry out conventional anchor rod grouting installation and surface concrete spraying construction into a tubular prestressed consolidation grouting device which can directly plug the water-rich tunnel seepage and serve as a strengthening anchor rod and can normally carry out concrete spraying construction, thereby overcoming the problems of difficult construction, low efficiency, large labor intensity of personnel, time and labor consumption, difficult concrete spraying, water seepage after concrete spraying and the like, reducing the personnel and equipment investment and accelerating the construction speed by the invention, increasing the probability of concrete spraying bonding on the tunnel excavation surface, increasing the thickness of single-layer concrete spraying, blocking the rock surface seepage as much as possible, improving the concrete spraying speed and the concrete surface seepage phenomenon, reducing the rebound rate of concrete spraying, reducing the risk of secondary expense caused by the seepage problem, saving the construction cost, compared with the existing concrete spraying construction efficiency, the construction efficiency is improved by 40 percent, the rebound rate is reduced by 40 percent, and better economic and social benefits are generated.
2. The invention belongs to the category of basic changes in the technical field of hydraulic and hydroelectric engineering, greatly promotes the progress of the water-rich tunnel water seepage treatment in the aspects of process and efficiency in the hydraulic and hydroelectric engineering, and has no relevant report in domestic and foreign water-rich tunnel water seepage treatment construction documents.
3. The invention reduces the investment of personnel and equipment, reduces the labor intensity of constructors and equipment, carries out timely water seepage and sealing water plugging treatment on the anchoring of the water-rich tunnel and the concrete spraying construction, reduces the rebound rate of the concrete spraying of the water-rich tunnel, improves the efficiency, accelerates the construction progress and has higher application value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic sectional view of the installation of the water-rich tunnel tubular prestressed consolidation grouting device of the present invention.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is an enlarged view of a portion B in fig. 1.
Fig. 4 is a schematic structural diagram of the tubular prestressed consolidation grouting device of the present invention.
FIG. 5 is a schematic side view of C-C of FIG. 4.
Fig. 6 is a schematic view of the working state of fig. 4.
Wherein, 1, excavating a water-rich tunnel; 12. a tunnel axis; 2. a circular drainage blind ditch pipe; 3. a longitudinal drainage blind ditch pipe; 31. a PVC pipe cross; a reinforcing mesh; 5. nano-spraying concrete; 6. a drain hole; 7. crown and side walls; 71. a steel pipe; 72. drilling; 73. a wedge iron; 74. expanding the steel sleeve; 75. turning a silk section; 76. a grout stopping ring; 77. a steel backing plate; 78. a nut; 79. drilling a steel base plate; 8. a PVC slurry delivery pipeline; 9. grouting cement; 10. cement slurry; 11. rock drilling.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available by purchase.
As shown in fig. 1 to 6, a water-rich tunnel tubular prestressed consolidation grouting device mainly comprises a water-rich tunnel excavation structural surface 1, a rock drilling hole 11, a tubular prestressed consolidation grouting device 7, an annular drainage blind ditch pipe 2, a longitudinal drainage blind ditch pipe 3, a reinforcing mesh 4, nano-sprayed concrete 5 and a drainage hole 6; the tubular prestressed consolidation grouting device 7 is arranged on the tunnel excavation surface 1 and is installed in the rock drilling hole 11, and the reinforcing mesh 4 is bound and fixed with the rock drilling hole; the circumferential drainage blind ditch pipe 2 is arranged in the circumferential direction of the tunnel excavation, and the longitudinal drainage blind ditch pipe 3 is connected with the circumferential drainage blind ditch pipe 2 through a PVC pipe four-way joint 31; the inner surface of the water-rich tunnel excavation face is sprayed with nano concrete 5, a drain hole 6 is formed in the lower portion of the water-rich tunnel excavation face, the tubular prestress consolidation grouting device 7 is formed by processing a seamless steel pipe 71, an expansion steel sleeve 74 and a reverse wedge 73 into a conical shape at the front end, processing a pipe head wire section 75, a grout stopping ring 76 and a steel backing plate 77 at the rear end, screwing a nut 78, and fixing the steel expansion sleeve with the wall of a rock drilling hole in a friction mode after the steel expansion sleeve expands under the action of the wedge.
The reinforcing mesh 4 is arranged outside the blind drainage ditch pipes 2 and 3 and a nut 78 of the tubular prestressed consolidation grouting device 7, cement slurry 10 is used for consolidating and grouting surrounding rocks on the inner side of the excavation surface of the water-rich tunnel through the tubular prestressed consolidation grouting device 7 to block water, inorganic nano concrete 5 is sprayed to cover the blind drainage ditch pipes 2 and 3 and the reinforcing mesh 4, the drain hole 6 is arranged on the excavation surface 1 of the water-rich tunnel, and the orifice section is provided with the blind drainage pipe for connection to prevent fine particles from flowing to the blind drainage ditch pipes.
The tubular prestressed consolidation grouting device can be manufactured into a corresponding diameter according to the diameter of a drilling hole of a surrounding rock on site; preferably, the steel pipe of the tubular prestressed consolidation grouting device is a phi 42 seamless galvanized steel pipe, the length of the steel pipe is 6000mm, phi 16 holes are formed in the pipe wall, the hole spacing is 500mm, and the steel pipe is spirally arranged. The front end of the steel pipe of the tubular prestress consolidation grouting device is conical, the rear end of the steel pipe is provided with a long thread with the length of 110mm, 4 symmetrical wedges are welded at the position 360mm away from the end of the steel pipe, and an expansion steel sleeve 74 which is 5mm larger than the outer wall of the steel pipe 71 is sleeved outside the wedges. A grout stopping ring, a steel backing plate and a screw cap are sequentially sleeved on the threading section, the diameter of the grout stopping ring is 66mm when being larger than the diameter of a rock drilling hole by 56mm and 10mm, the steel backing plate is a 150mm multiplied by 150cm square hole 79 with the thickness of 10mm, the middle of the square hole is provided with 43mm, and the screw cap is matched with threading.
The tubular prestress consolidation grouting device is arranged on a tunnel top arch and a side wall, the row spacing is 1.5m multiplied by 1.5m, and the arrangement is in a quincunx shape.
Before the tunnel is used, the tunnel is excavated and formed, if a water-rich phenomenon is discovered, rock drilling is carried out on the excavation surface of the water-rich tunnel by using a three-arm rock drilling trolley, the row spacing between the drilled holes is 1.5m multiplied by 1.5m, the holes are arranged in a quincunx manner, a drain hole is arranged at the lower part of a side wall, and finally, the seepage water of the water-rich tunnel is centralized and led into the drain holes and then drained to the drain ditches at the two sides of the tunnel. Manually matching with a machine to install a tubular prestress consolidation grouting device, directly inserting the device into the bottom of a rock drilling hole to reserve a 50mm thread section, screwing a screw cap by a torque helper, setting the torque at 50KN, inserting a wedge into an expansion steel sleeve, tightly fitting the wall of the rock drilling hole, tightly pressing a grout stop ring and a steel backing plate to ensure that a gap between a tubular anchor rod and the wall of the rock hole is blocked and no grout is leaked, installing a PVC grout delivery pipe on the exposed thread section, connecting the grout delivery pipe to a cement grouting machine, and stirring the grout in a high-speed stirrer by using a ratio of 2:1, 1:1, 0.8:1, 0.6:1 and 0.5: 1, carrying out consolidation grouting on 1-five-ratio pure water slurry, carrying out gradual thickening according to a grouting standard by a variable-pulp principle, carrying out grouting pressure of 0.5-1 MPa, switching to the most thickened stage, screening grout for 30min, carrying out construction sequence from a vault to a side wall from a high position to a low position by a tubular prestress consolidation grouting device, after the construction is finished for a section, starting to install annular and longitudinal drainage blind ditches, carrying out interval of 6m multiplied by 6m, then carrying out construction for hanging a reinforcing mesh, then carrying out injection construction of inorganic nano concrete, finding out water seepage points after the construction, and then randomly implementing the tubular prestress consolidation grouting device until no water seepage occurs. The invention is not only suitable for the water seepage treatment construction of the water-rich tunnel, but also suitable for the water seepage treatment construction of the local scattered water seepage part of the excavation surface of other underground caverns.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a rich water tunnel tubular prestressing force concreties cementer which characterized in that: the method comprises the following steps of (1) arranging on a water-rich tunnel excavation surface: the device comprises a tubular prestress consolidation grouting device, an annular drainage blind ditch pipe, a longitudinal drainage blind ditch pipe, a reinforcing mesh, nano-spray concrete and a drainage hole; the tubular prestressed consolidation grouting device is firmly bound with the tubular prestressed consolidation grouting device through a reinforcing mesh, the annular blind drainage ditch pipe is arranged in the annular direction of the tunnel excavation, and the longitudinal blind drainage ditch pipe is connected with the annular blind drainage ditch pipe; the tubular prestress consolidation grouting device is formed by adding a sleeve and a wedge into a steel pipe, machining the front end into a cone, turning a wire at the rear end of a pipe head, adding a grout stopping ring and a steel base plate, and screwing a screw cap.
2. The water-rich tunnel tubular prestressed consolidation grouting device of claim 1, characterized in that: the tubular prestressed consolidation grouting device is arranged on a tunnel top arch and side walls, the row spacing is 1.5m multiplied by 1.5m, and the arrangement is in a quincunx shape.
3. The water-rich tunnel tubular prestressed consolidation grouting device of claim 1, characterized in that: the diameter of the steel pipe of the tubular prestressed consolidation grouting device is phi 42 seamless steel pipe, the length is 6000mm, phi 16mm holes are drilled in the steel pipe, the hole spacing is 500mm, and the steel pipe is spirally arranged.
4. The water-rich tunnel tubular prestressed consolidation grouting device of claim 1, characterized in that: the end of the steel pipe of the tubular prestress consolidation grouting device is threaded by 110mm, and 4 symmetrical wedges are welded at the position of 360mm of the end of the threaded steel pipe.
5. The water-rich tunnel tubular prestressed consolidation grouting device of claim 1, characterized in that: and an expansion steel sleeve is sleeved outside the wedge iron of the tubular prestress consolidation grouting device.
6. The water-rich tunnel tubular prestressed consolidation grouting device of claim 1, characterized in that: and a square base plate with holes is arranged outside the steel pipe threading section of the tubular prestress consolidation grouting device.
7. The water-rich tunnel tubular prestressed consolidation grouting device of claim 1, characterized in that: the inner side of the tubular prestress consolidation grouting device is provided with a grout stopping ring, and a backing plate is arranged below the grout stopping ring.
8. The water-rich tunnel tubular prestressed consolidation grouting device of claim 1, characterized in that: the annular drainage blind ditch pipe is connected with the longitudinal drainage blind ditch pipe through a four-way joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110326695.2A CN113027487A (en) | 2021-03-26 | 2021-03-26 | Rich water tunnel tubular prestressing force concreties cementer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110326695.2A CN113027487A (en) | 2021-03-26 | 2021-03-26 | Rich water tunnel tubular prestressing force concreties cementer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113027487A true CN113027487A (en) | 2021-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110326695.2A Pending CN113027487A (en) | 2021-03-26 | 2021-03-26 | Rich water tunnel tubular prestressing force concreties cementer |
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| CN (1) | CN113027487A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114576468A (en) * | 2022-01-25 | 2022-06-03 | 华能澜沧江水电股份有限公司 | Diversion type penstock protection device |
-
2021
- 2021-03-26 CN CN202110326695.2A patent/CN113027487A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114576468A (en) * | 2022-01-25 | 2022-06-03 | 华能澜沧江水电股份有限公司 | Diversion type penstock protection device |
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