CN220565534U - Suspended ceiling structure of large-span grotto of underground factory building of hydraulic and hydroelectric engineering - Google Patents
Suspended ceiling structure of large-span grotto of underground factory building of hydraulic and hydroelectric engineering Download PDFInfo
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- CN220565534U CN220565534U CN202322255035.7U CN202322255035U CN220565534U CN 220565534 U CN220565534 U CN 220565534U CN 202322255035 U CN202322255035 U CN 202322255035U CN 220565534 U CN220565534 U CN 220565534U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 8
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- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 241000196324 Embryophyta Species 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Bridges Or Land Bridges (AREA)
Abstract
The utility model discloses a ceiling structure of a large-span cavity of an underground factory building of a hydraulic and hydroelectric engineering, which comprises two rock anchor beams with through length, a steel truss arched beam, a roof purline, a roof waterproof board, a plurality of steel suspenders, a main keel, a lower chord purline, a ceiling decorative board and a ceiling decorative board, wherein the two rock anchor beams are positioned on the two sides of the upstream and the downstream, the steel truss arched beam spans between the two rock anchor beams in the upstream and the downstream direction, the roof purline is installed on the upper flange of the steel truss arched beam, the roof waterproof board is fixed on the roof purline, the plurality of steel suspenders are fixed on the lower flange of the steel truss arched beam, the main keel is fixed below the steel suspenders, the main keel is welded and fixed with the lower chord purline, and the ceiling decorative board is fixed below the lower chord purline. The steel truss arched girder components are connected more safely and reliably, the steel truss arched girder and all the steel components can be processed and manufactured in factories and then transported to field assembly type construction and installation, and the steel truss arched girder has the advantages of high component processing precision, high construction speed, environmental protection, energy conservation and the like. The self-propelled steel structure platform avoids the cross operation of concrete pouring of a factory building and installation of electromechanical equipment, meets the normal operation requirement of a bridge crane, and ensures the construction time node of engineering.
Description
Technical Field
The utility model discloses a suspended ceiling structure of an underground plant of a hydraulic and hydroelectric engineering, in particular to a suspended ceiling structure for a large-span grotto of the underground plant of the hydraulic and hydroelectric engineering.
Background
The roof arch of the underground factory building is a concrete spray anchor support, and because the surrounding rock structure is not complete, the formed rugged spray layer is not smooth after the spray anchor support. Although the top arch is provided with system drain holes and drain pipes, certain moisture and water seepage also exist in the later stage, under the action of underground crevice water, the water seepage penetrates into the plant through the concrete spraying layer, and the normal operation of the unit can be influenced, so that the suspended ceiling needs to be used as a waterproof layer and can play a role in beautifying the plant. An air supply pipe, a smoke exhaust pipeline and an overhaul trestle are arranged in a space between the suspended ceiling of the underground factory building and the roof arch rock wall, and ventilation branch pipes and smoke exhaust branch pipes are arranged on the ventilation main pipeline and the smoke exhaust main pipeline at certain intervals and pass through the roof board to be communicated with the main pump room. Therefore, the motor layer suspended ceiling not only meets the requirements of safety and reliability, ventilation, illumination, maintenance and inspection, but also meets the requirements of water resistance, water drainage, corrosion resistance, fire resistance, attractive appearance and the like, and the use mutual interference with a bridge crane should be reduced as much as possible during the construction period.
In the current engineering practice, the method for waterproof and suspended ceiling of motor layer (or generator layer) roof arch of underground main workshop of water conservancy and hydropower engineering is generally carried out in the following modes of 1, steel concrete covered arched girder and steel concrete covered slab covered; 2. the color steel plate is supported on the steel net rack to prevent water; 3. the color steel waterproof board is arranged on the triangular steel roof truss, the decorative board is arranged on the triangular steel roof truss, and 4, the color steel waterproof board is added on the anchor rod suspension keel for the roof arch anchor spraying layer directly; 5. the upper surface of the steel arched girder is provided with a color steel waterproof board, and the lower surface is provided with a decorative board. The first method is that the steel-encased arched girder consists of skeleton angle steel, connecting ribs and steel-encased rolled thin steel plates, and no additional construction templates and construction bent frames are needed. And paving a profiled steel sheet at the bottom of the steel-encased floor slab, and paving reinforced concrete at the upper part of the steel-encased floor slab to form a combined stress structure. The construction period of the profiled steel sheet at the bottom of the steel-encased floor slab is used as a concrete template for pouring the floor slab, and the operation period is used as a suspended ceiling permanent decoration. However, because the span of the underground factory building is large, the pumping concrete pipeline is too long, and full-section concrete pouring is difficult to complete at one time. The method has high manufacturing cost, large material transportation quantity, difficult construction and long construction period. The second method is convenient to construct, but the same color steel plate is used for waterproofing and decoration, and although a funnel and a water conduit of dense hemp are locally arranged at each water seepage point under the top arch to guide water to a drainage ditch, the water seepage points of the top arch are more, the water seepage of the top arch can drop on a ventilation pipeline of an interlayer, even drop on a generator layer of a main plant through a steel plate joint, a wind port, a lamp socket and the like to influence production, the ventilation pipeline can be corroded over time, and even an air pipe needs to be replaced in a short period of time. In the third method, because the space between the upper chord and the lower chord of the triangular steel roof truss and the web members is smaller, the air pipes are difficult to apply during arrangement, and the transverse connection maintenance trestle among the exhaust pipes cannot be arranged. The fourth method is to directly hang the suspended ceiling beam, suspended ceiling purline and color steel waterproof board by using the hanging rod, and arrange devices such as ventilating duct in the space between suspended ceiling color steel waterproof board and suspended ceiling spraying layer, besides the disadvantage of the second method, the hanging rod is corroded by the water leakage of the suspended ceiling for a long time, and the hanging rod needs to be maintained frequently, if the maintenance is not in time, the potential safety hazard exists in the whole suspended ceiling structure, the fifth method has the best waterproof effect, and the devices such as ventilating duct are convenient to arrange, but the upper part of the steel hanging rod is connected with the steel arched beam by adopting hanging ring, and the lower part of the steel hanging rod is connected with the main keel by adopting hanging, so the integral stability is poor. The lower surface of the main keel is provided with a fixed decorative plate, the lower surface of the horizontal decorative layer purline is provided with a large installation height, and the operation space of the bridge crane is influenced. After the underground factory building bridge machine is installed and debugged, a steel platform for constructing a suspended ceiling is erected on the bridge machine, the bridge machine is required to be used for suspended ceiling construction, and cross operation is carried out on the bridge machine, concrete pouring of the factory building and electromechanical equipment, so that the construction period progress is affected.
Disclosure of Invention
The utility model aims to solve the technical problem of providing the suspended ceiling structure of the underground factory building of the hydraulic and hydroelectric engineering, which has the advantages of safe and reliable structure, good waterproof performance, convenient arrangement of ventilation equipment, light weight, convenient construction, short construction period and the like compared with the conventional cast-in-situ concrete slab beam structure. This furred ceiling structural style has saved the construction bent, has solved furred ceiling construction effectively and has used the mutual interference problem with the bridge machine, has not only satisfied the structural arrangement requirement, has still guaranteed the construction progress of underground factory building powerfully, and this large-span underground factory building furred ceiling structure has certain innovation, can supply the underground factory building furred ceiling structure of same type to consult, reference.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a furred ceiling structure of water conservancy and hydropower engineering underground factory building large-span grotto, including two reinforced concrete rock anchor beams of upper and lower both sides, be located the steel truss arched girder that spans the upper and lower direction between two rock anchor beams, the roof purlin is fixed to steel truss arched girder top flange, fixed roofing waterproof board in roofing purlin top, have certain distance between roofing waterproof board and the underground factory building roof arch, underground factory building roof arch infiltration is discharged to the low reaches side wall escape canal through roofing waterproof board, steel truss arched girder bottom flange welding many steel jib, steel jib below welding main joist, main joist and lower chord purlin welded fastening, the fixed furred ceiling decorative board of lower chord purlin below; and a plurality of blast pipes and smoke exhaust pipes are arranged in the space between the roof waterproof board and the suspended ceiling decorative board.
The two ends of the upper and lower stream of the steel truss arched girder are supported on a rock anchor girder, a steel plate embedded part and a steel anchor bolt are embedded in the rock anchor girder at the position opposite to the steel truss arched girder, and the rock anchor girder is connected with a rock wall through a prestressed anchor rod.
The panel form of furred ceiling decorative board is micropore abatvoix.
The roof purline is connected with the roof waterproof board by self-tapping screws, the self-tapping screws are provided with waterproof caps, the lower chord purline is connected with the ceiling decorative board by self-tapping screws according to the lap joint of the water flow direction.
Two overhaul trestle ways are longitudinally arranged along the factory building, and an overhaul trestle way connected in the upstream-downstream direction is arranged between the two trestle ways.
A suspended ceiling construction steel platform crossing the upstream and downstream directions is arranged below the two rock anchor beams and the suspended ceiling decorative plate, and the suspended ceiling construction steel platform adopts a self-propelled steel structure platform assembled by a steel structure; a plurality of buttress posts are arranged between a rock anchor beam and a rock wall crane beam, steel corbels are fixed on the buttress posts, sliding steel rails are longitudinally arranged on the steel corbels along a factory building, and a suspended ceiling construction steel platform is erected on the sliding steel rails on two sides.
The beneficial effects of the utility model are as follows: the suspended ceiling construction steel platform consists of a complete set of structure which is perfect and reliable, has strong bearing capacity and is rapid and convenient to install. From the condition that the suspended ceiling structure of the underground factory building has been implemented, the construction speed is higher, the functional requirement and the attractive requirement of the design are met, and the economic benefit is obvious. Because the steel truss arched girder is the main stress member of the suspended ceiling structure and is an independent bearing structure, each component is connected more safely and reliably, and all loads of the whole suspended ceiling are finally transferred to the steel truss arched girder, the advantages of the suspended ceiling structure can be better exerted. The suspended ceiling construction steel platform is staggered with the bridge machine in space, and in the stereo cross operation environment of civil engineering and unit installation, the steel separation frame platform and the bridge machine operate relatively independently and do not interfere with each other, so that the structural requirement is met, the problems that the installation and displacement of an aerial operation platform are effectively solved, a scaffold is inconvenient to build in the construction period or the scaffold is high in the factory building layer, and the construction progress is also powerfully ensured.
Drawings
FIG. 1 is a schematic diagram of a ceiling structure of a large-span cavern of an underground plant of the hydraulic and hydroelectric engineering.
Fig. 2A is an enlarged view of a in fig. 1.
FIG. 2B is a cross-sectional view 1-1 of FIG. 2A.
Fig. 3A is an enlarged view of B in fig. 1.
FIG. 3B is a section view 1-1 of FIG. 3A.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model; it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present utility model are within the protection scope of the present utility model.
In the description of the present utility model, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, 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 utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the suspended ceiling structure of the large-span cavity of the hydraulic and hydroelectric engineering underground factory building comprises two reinforced concrete rock anchor beams 1 on the upstream side and the downstream side, a steel truss arch beam 2 which spans the upstream direction and the downstream direction is arranged between the two rock anchor beams 1, a roof purline 5 is fixed on the upper flange of the steel truss arch beam 2, a roof waterproof plate 6 is fixed above the roof purline 5, a certain distance is reserved between the roof waterproof plate 6 and an underground factory building roof arch 12, water seeping from the underground factory building roof arch 12 is discharged to an upstream side wall drainage ditch 13 and a downstream side wall drainage ditch through the roof waterproof plate, a plurality of steel suspenders 3 are welded on the lower flange of the steel truss arch beam 2, a main keel 4 is welded on the lower side of the steel suspenders 3, the main keel 4 is welded and a lower chord purline 7, and a suspended ceiling decorative plate 8 is fixed below the lower chord purline 7; an overhaul trestle 9 is arranged above the main joist 4, and a plurality of blast pipes 10 and smoke exhaust pipes 11 are arranged in the space between the roof waterproof board 6 and the suspended ceiling decorative board 8.
The two ends of the upper and lower stream of the steel truss arched girder 2 are supported on the rock anchor girder 1, the position, which is opposite to the steel truss arched girder 2, in the rock anchor girder 1 is embedded with a steel plate embedded part and a steel anchor bolt, and the rock anchor girder 1 is connected with a rock wall through a prestressed anchor bolt. The steel truss arched girder 2 adopts H-shaped steel HN400X200X8X13, the main joist 4 adopts H-shaped steel HM194X150X6X9, and the materials are Q235B. The web and the flange of the H-shaped steel component adopt double-sided fillet welds.
The main joist 4 is welded and fixed with the lower chord purline 7, and the bottom elevation of the main joist 4 and the lower chord purline 7 is flush, so that the installation height is reduced, and the space requirement of normal operation of the factory bridge machine is ensured.
The roofing purline 5 and the lower chord purline 7 are made of C-shaped Q235 cold-formed thin-wall section steel.
The roof waterproof board 6 and the suspended ceiling decorative board 8 are both made of aluminum-zinc plated profiled steel sheets YX20-225-900, the combustion performance is A-level nonflammable materials, the thickness is 0.6mm, and the yield strength of the roof waterproof board 6 is 550MPa. The yield strength of the suspended ceiling decorative plate 8 is 300Mpa, and the panel is in the form of a micropore sound absorbing plate.
The construction steel platform 14 of the suspended ceiling has the largest structure characteristics of a whole groupThe assembled structure consists of a bed plate, a main beam, a secondary beam, a post-to-post support, a railing and the like 。 The suspended ceiling construction steel platform 14 adopts a self-propelled steel structure platform as a hoisting platform of a material.
A suspended ceiling construction steel platform 14 crossing the upstream and downstream directions is arranged below the two rock anchor beams 1 and the suspended ceiling decorative plate 8, and the suspended ceiling construction steel platform 14 adopts a self-propelled steel structure platform assembled by steel structures; a plurality of buttress posts 15 are arranged between the rock anchor beam 1 and the rock wall crane beam 18, steel corbels 16 are fixed on the buttress posts 15, sliding steel rails 17 are longitudinally arranged on the steel corbels 16 along a factory building, and suspended ceiling construction steel platforms 14 are erected on the sliding steel rails 17 on two sides.
The steel corbels 16 are 3 steel support plates to which the platform steel plates are welded. The suspended ceiling construction steel platform 14 adopts a working platform which is assembled by a steel structure and can self-walk along the steel rail 17. The two ends of the suspended ceiling construction steel platform 14 are respectively connected with an active trolley and a passive trolley, a motor and a speed reducer are arranged on the active trolley, the front end of the active trolley is connected with a rail cleaning plate, and the lower end of the rail cleaning plate stretches into the steel rail 17.
Specifically, as shown in fig. 2-3, in this embodiment, the steel truss arched girder 2 is welded to the purlin bracket 19, and the roofing purlin 5 is fixed to the purlin bracket 19 by bolts. The roof purline 5 is connected with the roof waterproof board 6 by self-tapping screws, the self-tapping screws are provided with waterproof caps, and the self-tapping screws are lapped according to the water flow direction. The lower chord purline 7 is connected with the suspended ceiling decorative plate 8 by self-tapping screws.
On the premise of meeting the basic function, the construction speed is higher from the implemented condition, the functional requirement and the attractive requirement of the design are met, and the economic benefit is obvious. Because the steel truss arched girder is the main stress member of the suspended ceiling structure and is an independent bearing structure, each component is connected more safely and reliably, and all loads of the whole suspended ceiling are finally transferred to the steel truss arched girder, the advantages of the suspended ceiling structure can be better exerted.
The suspended ceiling construction steel platform is staggered with the bridge machine in space, and in the stereo cross operation environment of civil engineering and unit installation, the steel separation frame platform and the bridge machine operate relatively independently and do not interfere with each other, so that the structural requirement is met, the problems that the installation and displacement of an aerial operation platform are effectively solved, a scaffold is inconvenient to build in the construction period or the scaffold is high in the factory building layer, and the construction progress is also powerfully ensured.
The above-described embodiments are only for illustrating the technical spirit and features of the present utility model, and it is intended to enable those skilled in the art to understand the content of the present utility model and to implement it accordingly, and the scope of the present utility model is not limited to the embodiments, i.e. equivalent changes or modifications to the spirit of the present utility model are still within the scope of the present utility model.
Claims (5)
1. The utility model provides a furred ceiling structure of water conservancy and hydropower engineering underground powerhouse large-span grotto, a serial communication port, including two reinforced concrete rock anchor beams (1) of upper and lower both sides, span steel truss arched girder (2) in upper and lower direction between two rock anchor beams (1), steel truss arched girder (2) top flange fixed roofing purlin (5), fixed roofing waterproof board (6) above roofing purlin (5), have certain distance between roofing waterproof board (6) and underground powerhouse roof arch (12), underground powerhouse roof arch (12) infiltration is discharged to upper and lower side wall escape canal (13) through roofing waterproof board, steel truss arched girder (2) lower flange welding many steel jib (3), steel jib (3) below welding main joist (4), main joist (4) and lower chord purlin (7) welded fastening, suspended ceiling decorative board (8) are fixed to below lower chord purlin (7); an overhaul trestle (9) is arranged above the main keel (4), and a plurality of blast pipes (10) and smoke exhaust pipes (11) are arranged in the space between the roof waterproof board (6) and the suspended ceiling decorative board (8); a suspended ceiling construction steel platform (14) crossing the upstream and downstream directions is arranged below the two rock anchor beams (1) and the suspended ceiling decorative plate (8), and the suspended ceiling construction steel platform (14) adopts a self-propelled steel structure platform assembled by a steel structure; a plurality of buttress posts (15) are arranged between a rock anchor beam (1) and a rock wall crane beam (18), steel corbels (16) are fixed on the buttress posts (15), sliding steel rails (17) are longitudinally arranged on the steel corbels (16) along a factory building, and suspended ceiling construction steel platforms (14) are erected on the sliding steel rails (17) on two sides.
2. The suspended ceiling structure of a large-span cavity of an underground powerhouse of a hydraulic and hydroelectric engineering according to claim 1, wherein the upstream end and the downstream end of the steel truss arched beam (2) are supported on a rock anchor beam (1), a steel plate embedded part and a steel anchor bolt are embedded in the position, opposite to the steel truss arched beam (2), in the rock anchor beam (1), and the rock anchor beam (1) is connected with a rock wall through a prestress anchor bolt.
3. Suspended ceiling structure of a large-span cavity of an underground powerhouse of a hydraulic and hydroelectric engineering according to claim 1, characterized in that the panel form of the suspended ceiling decorative plate (8) is a micropore sound absorbing plate.
4. The suspended ceiling structure of the large-span cavity of the underground powerhouse of the hydraulic and hydroelectric engineering according to claim 1, wherein the roof purline (5) and the roof waterproof board (6) are connected by self-tapping screws, the self-tapping screws are provided with waterproof caps, the lower chord purline (7) is connected with the suspended ceiling decorative board (8) by self-tapping screws according to the water flow direction.
5. The suspended ceiling structure of a large-span cavity of an underground plant of a hydraulic and hydroelectric engineering according to claim 1, wherein two overhauling trestle (9) are longitudinally arranged along the plant, and the overhauling trestle (9) connected in the upstream-downstream direction is arranged between the two trestle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322255035.7U CN220565534U (en) | 2023-08-22 | 2023-08-22 | Suspended ceiling structure of large-span grotto of underground factory building of hydraulic and hydroelectric engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322255035.7U CN220565534U (en) | 2023-08-22 | 2023-08-22 | Suspended ceiling structure of large-span grotto of underground factory building of hydraulic and hydroelectric engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220565534U true CN220565534U (en) | 2024-03-08 |
Family
ID=90090741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322255035.7U Active CN220565534U (en) | 2023-08-22 | 2023-08-22 | Suspended ceiling structure of large-span grotto of underground factory building of hydraulic and hydroelectric engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220565534U (en) |
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2023
- 2023-08-22 CN CN202322255035.7U patent/CN220565534U/en active Active
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