CN115637641A - Bridge self-cleaning type drainage device for municipal bridge engineering - Google Patents
Bridge self-cleaning type drainage device for municipal bridge engineering Download PDFInfo
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- CN115637641A CN115637641A CN202211299427.7A CN202211299427A CN115637641A CN 115637641 A CN115637641 A CN 115637641A CN 202211299427 A CN202211299427 A CN 202211299427A CN 115637641 A CN115637641 A CN 115637641A
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- fixedly connected
- water storage
- transfer line
- storage pipe
- bridge
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/108—Rainwater harvesting
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Abstract
The invention discloses a bridge self-cleaning type drainage device for municipal bridge engineering, and relates to the technical field of municipal drainage.
Description
Technical Field
The invention relates to the technical field of municipal drainage, in particular to a bridge self-cleaning drainage device for municipal bridge engineering.
Background
Municipal bridge is important traffic building facility, guarantee to span the building in special areas such as river course, the municipal administration drops into great, it is higher to the requirement of its security, in order to improve the safe current of bridge and the quality maintenance of bridge self, need discharge the accumulational rainwater of bridge floor, traditional drainage structures is direct to have seted up the wash port in the bridge floor both sides and carries out the drainage, this kind of mode causes the wash port to block up easily, lead to the drainage effect not good, need carry out certain improvement drainage effect.
"a bridge drainage device for municipal bridge engineering" as providing according to chinese patent grant publication No. CN 213476610U, adopt the installation of pouring of predetermineeing of encapsulation box, make things convenient for drainage device's installation, the cooperation is detained the use of box, realize the impurity filtering of high accuracy, ensure that the pipeline is not blockked up, the fault rate is reduced, the movable mounting who detains the box simultaneously, make things convenient for the maintenance in later stage, reduce the maintenance cost, however, it has only improved the jam condition of drain pipe, keep off the sewage and avoid carrying out the drain pipe outside the drain pipe, need artifically clear up the filth that is detained in the box after using a period, still great to manpower consumption, and drainage effect can be more and more poor in certain time, drainage effect is still not good enough.
Disclosure of Invention
The invention aims to provide a bridge self-cleaning type drainage device for municipal bridge engineering, which solves the technical problems that after the bridge self-cleaning type drainage device is used for a period of time, dirt in a retention box needs to be cleaned manually, the labor consumption is still large, the drainage effect is poorer and poorer within a certain period of time, and the drainage effect is not good enough.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a bridge is from clearance formula drainage device for municipal bridge engineering, is including filtering the baffle, filter the side lower extreme fixedly connected with funnel of baffle, the lower extreme fixedly connected with connecting pipe of funnel, the below of connecting pipe is provided with the water storage pipe, the side both ends of water storage pipe all are connected with back shaft one through the bearing rotation, filter the lower extreme fixedly connected with curb plate of baffle, front side the one end fixedly connected with bracing piece of water storage pipe is kept away from to back shaft one, the rear side the front side of the one end fixedly connected with curb plate of water storage pipe is kept away from to back shaft one, the lower extreme fixedly connected with bottom plate of bracing piece, upper surface one side of the lower extreme fixedly connected with bottom plate of curb plate, one side top that the connecting pipe was kept away from to the water storage pipe is provided with transmission, the surface sliding connection who filters the baffle has the brush-cleaning rod.
Preferably, transmission includes push pedal, transfer line one and transfer line two, one side fixedly connected with dead lever of connecting pipe is kept away from to the upper end of retaining pipe, the upper end of dead lever runs through to rotate and is connected with the equal fixedly connected with gyro wheel in pivot and pivot both ends, the spout has all been seted up to the lower surface both sides of push pedal, the spout inner wall of connecting the push pedal is rotated to the upper end of gyro wheel, one side of transfer line one and transfer line two all sets up to the T type, the tooth's socket has all been seted up to the opposite side of transfer line one and transfer line two, the leading flank fixedly connected with stopper one of curb plate, the front end of sliding connection stopper one is run through on the surface of transfer line one, the upper end fixedly connected with extension rod of curb plate, the upper end fixedly connected with stopper two of extension rod, the lower extreme of sliding connection stopper two is run through on the surface of transfer line two.
Preferably, the upper surface of the side plate is fixedly connected with a support frame, the upper end of the inner side surface of the support frame is rotatably connected with a second support shaft through a bearing, the surface of the second support shaft penetrates through the first gear and the second gear, the side end of the second gear is meshed with the tooth space surface of the first transmission rod, and the upper end of the first gear is meshed with the tooth space surface of the second transmission rod.
Preferably, the side surface of the second transmission rod is fixedly connected with the upper end of the side surface of the brushing rod.
Preferably, the side face of the push plate is fixedly connected with a T-shaped sliding rod, a T-shaped sliding groove is formed in the front side face of the side plate, and one end, far away from the push plate, of the T-shaped sliding rod is connected with the inner wall of the T-shaped sliding groove in a sliding mode.
Preferably, fixedly connected with apron one of front side upper end of curb plate, the last fixed surface of apron one is connected with the protective housing, the surface of transfer line one runs through the surface of sliding connection apron one, the one end that stopper two was kept away from to transfer line two runs through the side of sliding connection protective housing, gear one and gear two are located the inside of protective housing, the side upper end fixedly connected with apron two of filtration baffle, the apron is two in the funnel top.
Preferably, the upper surface of bottom plate fixedly connected with cushion, the upper end of the one end downside laminating cushion of connecting pipe is kept away from to the retaining pipe.
Compared with the prior art, the bridge self-cleaning type drainage device for the municipal bridge engineering provided by the invention has the following beneficial effects:
the invention provides a bridge self-cleaning type drainage device for municipal bridge engineering, which is characterized in that a water storage pipe and a transmission device are arranged, when accumulated water in the water storage pipe reaches a certain amount, the whole gravity center of the water storage pipe changes to deflect the water storage pipe, a transmission rod II is driven to transversely move through the transmission device, so that a cleaning rod is pushed to clean the surface of a filtering partition plate, dirt and blocked foreign matters are cleaned, the automatic cleaning function is realized, the drainage effect of the device is always kept in a higher state without manpower, the technical problems that after the device is used for a period of time, the dirt in a retention box needs to be manually cleaned, the manpower consumption is still large, the drainage effect is increasingly poor within a certain period of time, and the drainage effect is not good enough are solved.
The invention provides a self-cleaning type bridge drainage device for municipal bridge engineering, which is characterized in that a water storage pipe and a cushion are arranged, when all water accumulated in the water storage pipe is poured out, the integral gravity center of the water storage pipe deviates to one side of a roller, so that the water storage pipe rotates to the initial state again, one end of the water storage pipe below the roller deflects downwards until contacting with the upper surface of the cushion, the cushion plays a role in buffering, the lower end of the water storage pipe is prevented from being collided, the operation faults of the device are reduced, the roller is reduced in height when the water storage pipe deflects, so that a push plate loses support, a transmission device also recovers to the initial state, when accumulated water in the water storage pipe can deflect, two brushing rods can brush the surface of a filtering partition plate again, the circulation is realized, the state is not required to be adjusted manually, the full-automatic function is realized, and the efficiency is higher.
The invention provides a bridge self-cleaning drainage device for municipal bridge engineering, which is characterized in that a water storage pipe is arranged, when more water is accumulated on the surface of a bridge, the deflection frequency of the water storage pipe is higher, a cleaning rod cleans the surface of a filtering partition more frequently, the cleaning effect on the filtering partition is further improved, and the blockage is avoided.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the connection of the inner structure of the protective case of the present invention;
FIG. 3 is a disassembled view of the lower structure of the present invention;
FIG. 4 is a schematic view of the structure of the water storage pipe of the present invention disassembled;
FIG. 5 is an enlarged view of a portion of FIG. 3 according to the present invention.
In the figure: 1. the filter separator plate, 2, the funnel, 3, the connecting pipe, 4, the water storage pipe, 5, back shaft one, 6, the bracing piece, 7, the bottom plate, 8, the curb plate, 9, the scrubbing pole, 10, the cushion, 11, the dead lever, 12, the gyro wheel, 13, the push pedal, 14, transfer line one, 15, stopper one, 16, T type spout, 17, T type slide bar, 18, the extension rod, 19, stopper two, 20, transfer line two, 21, the support frame, 22, back shaft two, 23, gear one, 24, gear two, 25, apron one, 26, apron two, 27, the protective housing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-5, the present invention provides a technical solution, which comprises a filtering partition plate 1, a funnel 2 is fixedly connected to a lower end of a side surface of the filtering partition plate 1, a connecting pipe 3 is fixedly connected to a lower end of the funnel 2, a water storage pipe 4 is arranged below the connecting pipe 3, a first supporting shaft 5 is rotatably connected to both ends of a side surface of the water storage pipe 4 through a bearing, a side plate 8 is fixedly connected to a lower end of the filtering partition plate 1, a supporting rod 6 is fixedly connected to one end of the first supporting shaft 5 far from the water storage pipe 4, one end of the first supporting shaft 5 far from the water storage pipe 4 is fixedly connected to a front side surface of the side plate 8, a bottom plate 7 is fixedly connected to a lower end of the side plate 8, a transmission device is arranged above one side of the water storage pipe 4 far from the connecting pipe 3, a cleaning rod 9 is slidably connected to a surface of the filtering partition plate 1, the transmission device comprises a push plate 13, a first transmission rod 14 and a second transmission rod 20, a second transmission rod 14 is fixedly connected to one side surface of the upper end of the connecting groove 14, a second side surface of the transmission rod 14 is rotatably connected to a limiting block, and a second side plate 14 is connected to a supporting frame 14, the upper end of the inner side face of the support frame 21 is rotatably connected with a second support shaft 22 through a bearing, the surface of the second support shaft 22 is fixedly connected with a first gear 23 and a second gear 24 in a penetrating mode, the side end of the second gear 24 is meshed with the tooth socket face of the first transmission rod 14, and the upper end of the first gear 23 is meshed with the tooth socket face of the second transmission rod 20;
the side face of the second transmission rod 20 is fixedly connected with the upper end of the side face of the brushing rod 9, the side face of the push plate 13 is fixedly connected with a T-shaped slide rod 17, the front side face of the side plate 8 is provided with a T-shaped slide groove 16, one end, far away from the push plate 13, of the T-shaped slide rod 17 is slidably connected with the inner wall of the T-shaped slide groove 16, the upper end of the front side face of the side plate 8 is fixedly connected with a first cover plate 25, the upper surface of the first cover plate 25 is fixedly connected with a protective shell 27, the surface of the first transmission rod 14 penetrates through the surface of the first sliding connection cover plate 25, one end, far away from the second limiting block 19, of the second transmission rod 20 penetrates through the side face of the sliding connection protective shell 27, the first gear 23 and the second gear 24 are located inside the protective shell 27, the upper end of the side face of the filtering partition plate 1 is fixedly connected with a second cover plate 26, and the second cover plate 26 is located above the funnel 2.
In this embodiment: the device is buried above sewers at two sides of a bridge road, so that a cover plate I25 is flush with the road surface, a water storage pipe 4 is positioned below the road surface and is shielded by the cover plate I25, a cover plate II 26 is flush with road shoulders at two sides of the bridge, a funnel 2 is shielded below, the bridge road surface accumulated water flows into the funnel 2 through a gap of a filtering partition plate 1 and then flows into an upper opening of the water storage pipe 4 through a connecting pipe 3 and is accumulated, dirt is shielded by the filtering partition plate 1 and stays at the outer side of the filtering partition plate 1, when the accumulated water in the water storage pipe 4 reaches a certain amount, the water storage pipe 4 can rapidly deflect due to the change of the whole gravity center, one end of the upper opening of the water storage pipe 4 deflects downwards, the accumulated water is poured into the sewer below, when the water storage pipe 4 deflects, a roller 12 deflects upwards and slides along a sliding chute at the bottom surface of a push plate 13, thereby the push plate 13 is pushed upwards without limiting the rotation of the water storage pipe 4, the push plate 13 pushes the first transmission rod 14 to move upwards, the push plate 13 is limited by the T-shaped sliding rod 17 and the T-shaped sliding groove 16, the first transmission rod 14 is limited by the first limiting block 15, so that the push plate 13 and the first transmission rod 14 both vertically move upwards, the second transmission rod 24 is driven to rotate by the tooth space surface of the first transmission rod 14, then the second gear 24 drives the first gear 23 to rotate and drive the second transmission rod 20 to slide, the second transmission rod 20 is limited by the second limiting block 19 and can only move transversely, two cleaning rods 9 are fixed on the side surface of the second transmission rod 20, one cleaning rod 9 is positioned at the most lateral end of the filtering partition plate 1 in the initial state, the other cleaning rod 9 is positioned in the middle of the filtering partition plate 1 in the initial state, when the second transmission rod 20 moves transversely, the two cleaning rods 9 are driven to slide along the surface of the filtering partition plate 1, and dirt and foreign matters remained on the surface of the filtering partition plate 1 are cleaned, when the water storage pipe 4 deflects to the extreme position, two brush-cleaning rods 9 can be brushed to cover all areas on the surface of the filtering partition plate 1, the existence of brushing dead angles is avoided, the filtering partition plate 1 is automatically brushed by utilizing water flow gravity, manual cleaning is not needed, the drainage effect of the device is kept in a higher state all the time, the problem that dirt in a retention box needs to be manually cleaned after the device is used for a period of time is solved, the manpower consumption is still higher, the drainage effect is worse and worse in a certain period of time, the drainage effect is not good enough is solved, the protective shell 27 plays a role in protection, and the internal structure is prevented from being exposed to the external environment and being damaged.
Example two:
referring to fig. 1-3, on the basis of the first embodiment, the present invention provides a technical solution: the upper surface of the bottom plate 7 is fixedly connected with a cushion 10, and the water storage pipe 4 is far away from the upper end of the cushion 10 attached to the lower side of one end of the connecting pipe 3.
In this embodiment: when the accumulated water in the water storage pipe 4 is poured out completely, the whole gravity center of the water storage pipe 4 deviates to one side of the roller 12, the water storage pipe 4 rotates to the initial state again, one end, located below the roller 12, of the water storage pipe 4 deflects downwards until contacting with the upper surface of the cushion 10, the cushion 10 plays a buffering role, the lower end of the water storage pipe 4 is prevented from being collided, operation faults of the device are reduced, the height of the roller 12 is reduced when the water storage pipe 4 deflects, the push plate 13 loses support of the push plate 13, the push plate 13 and the first transmission rod 14 slide downwards vertically, the second transmission rod 20 retracts into the protective shell 27, the two brushing rods 9 return to the initial positions, when the accumulated water in the water storage pipe 4 can deflect, the two brushing rods 9 can brush the surface of the filtering partition plate 1 again, circulation is achieved, when the accumulated water on the road surface of the bridge is more, the deflection frequency of the water storage pipe 4 is higher, the brushing rods 9 brush the surface of the filtering partition plate 1 more frequently, the effect of the filtering partition plate 1 is further improved, and blockage is avoided.
The working principle is as follows: the bridge pavement accumulated water flows into the funnel 2 through the gap of the filtering baffle plate 1, then flows into the upper opening of the water storage pipe 4 through the connecting pipe 3 and is accumulated, dirt is shielded by the filtering baffle plate 1 and stays at the outer side of the filtering baffle plate 1, when the accumulated water in the water storage pipe 4 reaches a certain amount, the water storage pipe 4 can quickly deflect due to the change of the whole gravity center, one end of the upper opening of the water storage pipe 4 deflects downwards, the accumulated water is poured into a sewer below, when the water storage pipe 4 deflects, the roller 12 deflects upwards and slides along the chute at the bottom surface of the push plate 13, so that the push plate 13 is pushed upwards without limiting the rotation of the water storage pipe 4, the push plate 13 pushes the transmission rod I14 to move upwards, the push plate 13 and the transmission rod I14 both move upwards vertically, so that the gear II 24 rotates by utilizing the tooth space surface of the transmission rod I14, then the gear II 24 drives the gear I23 to rotate and drive the transmission rod II 20 to slide, the transmission rod II 20 is limited by the limiting block II 19 and can only transversely move, two brushing cleaning rods 9 are fixed on the side surface of the transmission rod II 20, one brushing cleaning rod 9 is positioned at the most lateral end of the filtering partition plate 1 in the initial state, the other brushing cleaning rod 9 is positioned in the middle of the filtering partition plate 1 in the initial state, when the transmission rod II 20 transversely moves, the two brushing cleaning rods 9 are driven to slide along the surface of the filtering partition plate 1 to clean dirt and foreign matters remained on the surface of the filtering partition plate 1, when all water accumulated in the water storage pipe 4 is poured out, the integral gravity center of the water storage pipe 4 deviates to one side of the roller 12, so that the water storage pipe 4 rotates to the initial state again, one end of the water storage pipe 4 positioned below the roller 12 downwards deflects until the end contacts the upper surface of the cushion 10, the cushion 10 plays a buffering role, and the lower end of the water storage pipe 4 is prevented from being collided, reduce the device operation trouble, the high decline of gyro wheel 12 makes push pedal 13 lose the support when water storage pipe 4 deflects, and push pedal 13 and the vertical gliding of transfer line one 14, inside transfer line two 20 withdrawed protective housing 27, two brush-cleaning rod 9 got back to initial position, and when ponding reached and can deflect in water storage pipe 4, two brush-cleaning rod 9 can be cleaned again and filtered 1 surfaces of baffle to this circulation realizes self-cleaning function.
Claims (7)
1. The utility model provides a bridge is from clearance formula drainage device for municipal bridge engineering, includes filtering baffle (1), its characterized in that: the utility model discloses a filter baffle, including filter baffle (1), funnel (2), the lower extreme fixedly connected with connecting pipe (3) of funnel (2), the below of connecting pipe (3) is provided with water storage pipe (4), the side both ends of water storage pipe (4) all are connected with back shaft (5) through the bearing rotation, filter baffle (1) the lower extreme fixedly connected with curb plate (8), the front side the one end fixedly connected with bracing piece (6) of water storage pipe (4), rear side are kept away from in back shaft (5) the leading flank of the one end fixedly connected with curb plate (8) of water storage pipe (4), the lower extreme fixedly connected with bottom plate (7) of bracing piece (6), upper surface one side of lower extreme fixedly connected with bottom plate (7) of curb plate (8), one side top that connecting pipe (3) were kept away from in water storage pipe (4) is provided with transmission, the sliding surface of filtering baffle (1) is connected with brush cleaning rod (9).
2. The bridge self-cleaning drainage device for municipal bridge engineering according to claim 1, characterized in that: the utility model discloses a water storage pipe, including push pedal (13), transfer line (14) and transfer line two (20), one side fixedly connected with dead lever (11) of connecting pipe (3) are kept away from to the upper end of water storage pipe (4), the upper end of dead lever (11) is run through to rotate and is connected with pivot and the equal fixedly connected with gyro wheel in pivot both ends (12), the spout has all been seted up to the lower surface both sides of push pedal (13), the spout inner wall of connecting push pedal (13) is rotated to the upper end of gyro wheel (12), one side of transfer line (14) and transfer line two (20) all sets up to the T type, the tooth's socket has all been seted up to the opposite side of transfer line (14) and transfer line two (20), the leading flank fixedly connected with stopper one (15) of curb plate (8), the front end of sliding connection stopper one (15) is run through to the surface of transfer line (14), the upper end fixedly connected with extension rod (18) of curb plate (8), the upper end fixedly connected with stopper two (19) of extension rod (18), the lower extreme of stopper two (19) are run through to the surface of sliding connection stopper two (20).
3. The bridge self-cleaning drainage device for municipal bridge engineering according to claim 1, characterized in that: the upper surface fixedly connected with support frame (21) of curb plate (8), the medial surface upper end of support frame (21) is connected with back shaft two (22) through the bearing rotation, the surface of back shaft two (22) runs through fixedly connected with gear one (23) and gear two (24), the tooth space face of the side meshing transfer line one (14) of gear two (24), the tooth space face of the upper end meshing transfer line two (20) of gear one (23).
4. The bridge self-cleaning drainage device for municipal bridge engineering according to claim 2, wherein: the side surface of the second transmission rod (20) is fixedly connected with the upper end of the side surface of the brushing rod (9).
5. The bridge self-cleaning drainage device for municipal bridge engineering according to claim 2, wherein: the side fixedly connected with T type slide bar (17) of push pedal (13), T type spout (16) have been seted up to the leading flank of curb plate (8), the inner wall of one end sliding connection T type spout (16) that push pedal (13) were kept away from in T type slide bar (17).
6. The bridge self-cleaning drainage device for municipal bridge engineering according to claim 3, wherein: the utility model discloses a funnel filter baffle, including curb plate (8), the leading flank upper end fixedly connected with apron one (25) of curb plate (8), the last fixed surface of apron one (25) is connected with protective housing (27), the surface of transfer line one (14) runs through the surface of sliding connection apron one (25), the one end that stopper two (19) were kept away from in transfer line two (20) runs through the side of sliding connection protective housing (27), gear one (23) and gear two (24) are located the inside of protective housing (27), the side upper end fixedly connected with apron two (26) of filtering baffle (1), apron two (26) are located funnel (2) top.
7. The bridge self-cleaning drainage device for municipal bridge engineering according to claim 1, wherein: the upper surface of bottom plate (7) fixed connection has cushion (10), the upper end of the one end downside laminating cushion (10) of connecting pipe (3) is kept away from in retaining pipe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211299427.7A CN115637641A (en) | 2022-10-21 | 2022-10-21 | Bridge self-cleaning type drainage device for municipal bridge engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211299427.7A CN115637641A (en) | 2022-10-21 | 2022-10-21 | Bridge self-cleaning type drainage device for municipal bridge engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115637641A true CN115637641A (en) | 2023-01-24 |
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ID=84944635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211299427.7A Withdrawn CN115637641A (en) | 2022-10-21 | 2022-10-21 | Bridge self-cleaning type drainage device for municipal bridge engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115637641A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117248446A (en) * | 2023-10-24 | 2023-12-19 | 恒基建设集团有限公司 | A bridge self-cleaning drainage device used in municipal bridge projects |
| CN118308958A (en) * | 2024-06-11 | 2024-07-09 | 河南恒高建筑工程有限公司 | Bridge self-cleaning drainage equipment for municipal bridge engineering |
-
2022
- 2022-10-21 CN CN202211299427.7A patent/CN115637641A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117248446A (en) * | 2023-10-24 | 2023-12-19 | 恒基建设集团有限公司 | A bridge self-cleaning drainage device used in municipal bridge projects |
| CN118308958A (en) * | 2024-06-11 | 2024-07-09 | 河南恒高建筑工程有限公司 | Bridge self-cleaning drainage equipment for municipal bridge engineering |
| CN118308958B (en) * | 2024-06-11 | 2024-09-06 | 河南恒高建筑工程有限公司 | Bridge self-cleaning drainage equipment for municipal bridge engineering |
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Application publication date: 20230124 |