CN111021290A - Primary and secondary formula central authorities anticollision barrier system that can open and close - Google Patents
Primary and secondary formula central authorities anticollision barrier system that can open and close Download PDFInfo
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- CN111021290A CN111021290A CN201911171109.0A CN201911171109A CN111021290A CN 111021290 A CN111021290 A CN 111021290A CN 201911171109 A CN201911171109 A CN 201911171109A CN 111021290 A CN111021290 A CN 111021290A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
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- 238000010276 construction Methods 0.000 abstract description 3
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- JHJNPOSPVGRIAN-SFHVURJKSA-N n-[3-[(1s)-1-[[6-(3,4-dimethoxyphenyl)pyrazin-2-yl]amino]ethyl]phenyl]-5-methylpyridine-3-carboxamide Chemical compound C1=C(OC)C(OC)=CC=C1C1=CN=CC(N[C@@H](C)C=2C=C(NC(=O)C=3C=C(C)C=NC=3)C=CC=2)=N1 JHJNPOSPVGRIAN-SFHVURJKSA-N 0.000 description 9
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- 238000009417 prefabrication Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/12—Continuous barriers extending along roads or between traffic lanes and having means for providing occasional passage, e.g. for emergency vehicles
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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
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention provides a primary-secondary type openable and closable central anti-collision fence system. The system is provided with a fixed parent central anti-collision fence system, a movable child anti-collision fence system and an embedded type traction system, the three systems are matched in a cooperative mode, a child steel anti-collision box body structure can be collected into the parent anti-collision system through the embedded type traction system in an emergency situation, and then a section of road central separation belt is reserved for the U-turn vehicle to run. The central anti-collision fence system adopts prefabricated assembly, has high assembly rate, short construction period, overhaulable operation period and no land waste, and has better economic benefit and landscape effect. The traffic demand of a turning lane can be quickly met when an emergency accident happens, the problem of turning around of vehicles in the engineering of highways and urban expressways can be effectively solved, a large amount of rescue time is saved, and the guarantee strength of property and life safety of people is enhanced.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a primary-secondary type openable and closable central anti-collision fence system.
Background
At present, a large number of fixed central anti-collision fences exist in urban expressways and expressways, when an emergency accident happens in the driving process of a vehicle, the driving direction can be converted only by driving to a next entrance, a large amount of rescue time is wasted in practice, the degree of guaranteeing property and life safety of people is not enough, manpower and time are wasted, and the traffic function conversion efficiency is low.
In order to solve the above-mentioned traffic switching problem and save the emergency treatment time that needs to be spent when taking place the emergency, a central anti-collision separation structure that has high automation degree, high efficiency and convenience, can solve the vehicle turning problem and compromise economic nature and aesthetic property is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a primary-secondary type openable central anti-collision fence system, and aims to solve the problems that the existing central anti-collision fence is fixed and cannot move, so that time and labor are wasted when a rescue vehicle is used for converting directions, and the conversion efficiency of traffic functions is low.
The invention is realized in such a way that a primary-secondary type openable central anti-collision fence system is arranged on a central road division strip, and a plurality of central anti-collision fence systems extend along the longitudinal direction of the central road division strip; each central anti-collision fence system comprises a fixed parent central anti-collision fence system (1), a movable child anti-collision fence system (2) and an embedded traction system (3); the fixed parent central anti-collision fence system (1) is arranged at intervals along the longitudinal direction of a road, the fixed parent central anti-collision fence system (1) is provided with a hollow anti-collision high-strength steel plate (1a), and the movable child anti-collision fence system (2) is provided with a movable child steel anti-collision box body structure (2 a); the embedded traction system (3) can pull the sub-body steel anti-collision box body structure (2a) to move in a reciprocating mode, so that the sub-body steel anti-collision box body structure can be embedded into the anti-collision high-strength steel plate (1a) to achieve an opening function; or the area between two adjacent anti-collision high-strength steel plates (1a) is closed to realize the closing function.
Furthermore, the central anti-collision fence system further comprises a concrete foundation (4) located below the driving road surface (7), flange plates (1a-1) extending out of the bottoms of the anti-collision high-strength steel plates (1a) towards the two outer sides respectively, and the flange plates are anchored in the concrete foundation (4) through anchor rods (5) and nuts (6).
Furthermore, the anti-collision high-strength steel plate (1a) is formed by prefabricating steel plates with the thickness of not less than 4.5mm in a factory, and the vertical clearance between the anti-collision high-strength steel plate and the daughter steel anti-collision box body structure (2a) is about 1cm, and the distance between the anchoring points of the flange plate (1a-1) at the bottom of the anti-collision high-strength steel plate and the concrete foundation (4) and the driving road surface (7) is not less than 10 cm.
Furthermore, the movable sub-body anti-collision fence system (2) further comprises a longitudinal stiffening plate (2b) positioned inside the sub-body steel anti-collision box body structure (2a), a pulley block (2c) positioned at the bottom of the sub-body steel anti-collision box body structure (2a) and a guide rail box (2d), and the guide rail box (2d) is embedded at the top of the concrete foundation (4); the guide rail box (2d) is internally provided with a concave guide rail groove (2d-1) matched with the pulley block (2c), and the concave guide rail groove (2d-1) is used as a longitudinal moving rail of the pulley block (2c) in a road central dividing strip.
Further, the embedded traction system (3) comprises a motor (3a), a transmission pulley (3b), a transmission belt (3c), a traction steel cable (3d), an equipment foundation pit (3e) and a water collecting pit (3 f); the traction steel cable (3d) vertically and horizontally penetrates through a steel cable hole reserved in the guide rail box (2d) along a road central separation belt, and two ends of the traction steel cable (3d) are respectively anchored at anchoring points (2a-1) reserved at the bottoms of two ends of the sub-body steel anti-collision box body structure (2a), so that the transmission pulley (3b) longitudinally rolls along the concave guide rail groove (2d-1) under the action of longitudinal traction force provided by the motor (3a), and the longitudinal moving function of the sub-body steel anti-collision box body structure (2a) is realized.
Furthermore, the central anti-collision fence system also comprises a controller, and the motor (3a) is controlled by the controller to realize that the transmission belt (3c) drives the transmission pulley (3b) to rotate; and the transmission pulley (3b) pulls the traction steel cable (3d) after rotating, so as to provide longitudinal traction for the pulley block (2 c).
Further, a steel beam groove (2d-2) is formed in the center of the top of the guide rail box (2d), and the steel beam groove (2d-2) is arranged along the longitudinal length of the guide rail box (2 d); the guide rail box (2d) is longitudinally provided with a longitudinal slope, and accumulated water is drained into the water collecting pit (3 f).
Furthermore, the central anti-collision fence system is in a closed state under a general condition, and two end positions of the sub-body steel anti-collision box body structure (2a) respectively extend into the two adjacent anti-collision high-strength steel plates (1 a); the automobile anti-collision box is in an open state under an emergency working condition, the sub-body steel anti-collision box body structure (2a) is completely embedded into the anti-collision high-strength steel plate (1a) through pulling, and a central separation zone with a certain width is reserved for vehicles to turn around and change lanes to run.
Further, when the box body structure is in a closed state, the end of the sub-body steel anti-collision box body structure (2a) extends into the anti-collision high-strength steel plate (1a) to be not less than 1 m; when the box body is in an open state, the sub-body steel anti-collision box body structure (2a) is completely embedded into the anti-collision high-strength steel plate (1a), and a central separation belt with the width of 8m is reserved.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a primary-secondary type openable and closable central anti-collision fence system in a central separation zone of an urban expressway or an expressway according to a certain distance according to traffic demands, which is provided with a fixed primary central anti-collision fence system, a movable secondary anti-collision fence system and an embedded traction system, wherein the three systems are cooperated, so that a secondary steel anti-collision box body structure can be collected into an anti-collision high-strength steel plate through the embedded traction system in an emergency, and a section of road central separation zone is further vacated for a turning vehicle to run.
The central anti-collision fence system is prefabricated and assembled, high in assembly rate, short in construction period, capable of being overhauled in operation period, free of land waste and good in economic benefit and landscape effect. The traffic demand of a turning lane can be quickly met when an emergency accident happens, the problem of turning around of vehicles in the engineering of highways and urban expressways can be effectively solved, a large amount of rescue time is saved, and the guarantee strength of property and life safety of people is enhanced.
Drawings
Fig. 1 is a schematic cross-sectional view of a primary-secondary openable central anti-collision fence system according to an embodiment of the present invention;
FIG. 2 is a schematic sectional elevation view of the center crash barrier apparatus shown in FIG. 1 in an open state;
FIG. 3 is a schematic sectional elevational view of the center crash barrier apparatus illustrated in FIG. 1 in a closed position;
fig. 4 is a schematic longitudinal elevation view of a pulley block at the bottom of the movable sub-body crash barrier system according to the embodiment of the present invention;
fig. 5 is a schematic plan view of the top of the rail groove according to the embodiment of the present invention.
In the figure: 1. the movable sub-body anti-collision fence system comprises a fixed parent body central anti-collision fence system body, 1a, an anti-collision high-strength steel plate, 1a-1, flange plates, 2, a movable sub-body anti-collision fence system body, 2a, a sub-body steel anti-collision box body structure, 2a-1, anchoring points, 2b, longitudinal stiffening plates, 2c, pulley blocks, 2d, a guide rail box, 2d-1, a concave guide rail groove, 2d-2, a steel bundle groove, 3, an embedded automatic traction system, 3a, a motor, 3b, transmission pulleys, 3c, a transmission belt, 3d, a traction steel cable, 3e, an equipment foundation pit, 3f, a water collecting pit, 4, a concrete foundation, 5, an anchor rod, 6, a nut, 7 and a traveling road surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, a primary-secondary type openable and closable central collision avoidance system according to an embodiment of the present invention is shown, the central collision avoidance system is disposed on a central road partition, and a plurality of central collision avoidance systems extend along a longitudinal direction of the central road partition.
Each central anti-collision fence system comprises a fixed parent central anti-collision fence system 1, a movable daughter anti-collision fence system 2, an embedded traction system 3, a concrete foundation 4 positioned below a driving road surface 7 and a controller.
Fixed matrix central authorities anticollision barrier system 1 sets up along the road longitudinal direction interval, and fixed matrix central authorities anticollision barrier system 1 has hollow crashproof steel sheet 1a that excels in, and the flange board 1a-1 that the crashproof steel sheet 1a bottom extends to two outside directions respectively that excels in, and the flange board passes through stock 5 and nut 6 anchor in concrete foundation 4. In this embodiment, the high-strength steel plate 1a is prefabricated in a factory from a steel plate with a thickness of not less than 4.5mm, and the vertical clearance between the steel plate and the sub-body steel crash box body structure 2a is about 1cm, and the distance between the anchoring points of the flange plate 1a-1 at the bottom and the concrete foundation 4 is not less than 10 cm.
The movable sub-body anti-collision fence system 2 is provided with a movable sub-body steel anti-collision box body structure 2a, a longitudinal stiffening plate 2b positioned inside the sub-body steel anti-collision box body structure 2a, and a pulley block 2c and a guide rail box 2d positioned at the bottom of the sub-body steel anti-collision box body structure 2 a. The guide rail box 2d is fixedly embedded at the top of the concrete foundation 4; wherein, a concave guide rail groove 2d-1 matched with the pulley block 2c is arranged in the guide rail box 2d, and the concave guide rail groove 2d-1 is used as a longitudinal moving track of the pulley block 2c in the road central dividing strip.
The embedded traction system 3 comprises a motor 3a, a transmission pulley 3b, a transmission belt 3c, a traction steel cable 3d, an equipment foundation pit 3e and a water collection pit 3 f. The traction steel cable 3d vertically and horizontally penetrates through a steel cable hole reserved in the guide rail box 2d along a road central separation belt, and two ends of the traction steel cable 3d are respectively anchored at anchoring points 2a-1 reserved at the bottoms of two ends of the sub-body steel anti-collision box body structure 2a, so that the transmission pulley 3b longitudinally rolls along the concave guide rail groove 2d-1 under the action of longitudinal traction force provided by the motor 3a, and the longitudinal movement function of the sub-body steel anti-collision box body structure 2a is realized.
The motor 3a drives the transmission pulley 3b to rotate by the transmission belt 3c under the control of the controller; the transmission pulley 3b pulls the traction steel cable 3d after rotating, and provides longitudinal traction for the pulley block 2 c.
The center of the top of the guide rail box 2d is provided with a steel bundle groove 2d-2, and the steel bundle groove 2d-2 is arranged along the longitudinal length of the guide rail box 2 d. The guide rail box 2d is longitudinally provided with a longitudinal slope, and accumulated water is drained into the sump 3 f.
When the motor 3a corotation, the embedded type traction system 3 can pull the sub-body steel anti-collision box body structure 2a to move in the positive direction, so that the sub-body steel anti-collision box body structure can be embedded into the anti-collision high-strength steel plate 1a to realize the opening function. When the motor 3a reverses, the embedded traction system 3 can pull the daughter steel anti-collision box body structure 2a to move reversely, and the area between two adjacent anti-collision high-strength steel plates 1a is sealed to realize the closing function.
Specifically, central anticollision barrier system is in the closed condition under general condition, and the both ends position of daughter steel anticollision box body structure 2a stretches into inside no less than 1m of two adjacent crashproof high-strength steel sheets 1a respectively. The automobile anti-collision box body structure is in an opening state under an emergency working condition, the sub-body steel anti-collision box body structure 2a is completely embedded into the anti-collision high-strength steel plate 1a through pulling, and a central separation belt with the width of 8m is reserved for the automobile to turn around and change lanes.
In conclusion, the central anti-collision fence system capable of being opened and closed in a primary-secondary mode is arranged at the central separation zone of the urban expressway or the expressway according to the traffic demand at a certain interval, the system is provided with the fixed type parent central anti-collision fence system, the movable secondary anti-collision fence system and the embedded type traction system, the three systems are matched in a cooperative mode, the secondary steel anti-collision box body structure can be collected into the anti-collision high-strength steel plate through the embedded type traction system in an emergency situation, and then a section of road central separation zone is reserved for the U-turn vehicle to run.
Therefore, the central anti-collision fence system of the embodiment has the advantages of prefabrication and assembly, high assembly rate, short construction period, overhaul in the operation period, no waste of land, and good economic benefit and landscape effect. The traffic demand of a turning lane can be quickly met when an emergency accident happens, the problem of turning around of vehicles in the engineering of highways and urban expressways can be effectively solved, a large amount of rescue time is saved, and the guarantee strength of property and life safety of people is enhanced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The primary and secondary type openable and closable central anti-collision fence system is arranged on a central road division strip, and a plurality of central anti-collision fence systems extend along the longitudinal direction of the central road division strip; the anti-collision fence system is characterized in that each central anti-collision fence system comprises a fixed parent central anti-collision fence system (1), a movable child anti-collision fence system (2) and an embedded traction system (3); the fixed parent central anti-collision fence system (1) is arranged at intervals along the longitudinal direction of a road, the fixed parent central anti-collision fence system (1) is provided with a hollow anti-collision high-strength steel plate (1a), and the movable child anti-collision fence system (2) is provided with a movable child steel anti-collision box body structure (2 a); the embedded traction system (3) can pull the sub-body steel anti-collision box body structure (2a) to move in a reciprocating mode, so that the sub-body steel anti-collision box body structure can be embedded into the anti-collision high-strength steel plate (1a) to achieve an opening function; or the area between two adjacent anti-collision high-strength steel plates (1a) is closed to realize the closing function.
2. The primary and secondary openable and closable central crash barrier system according to claim 1, further comprising a concrete foundation (4) located below the driving road (7), wherein the bottom of the high-strength crash-proof steel plate (1a) is provided with flange plates (1a-1) extending towards two outer sides, respectively, and the flange plates are anchored in the concrete foundation (4) through anchor rods (5) and nuts (6).
3. The child-mother type openable and closable central crash barrier system according to claim 2, wherein the crash high-strength steel plate (1a) is prefabricated in a factory from a steel plate having a thickness of not less than 4.5mm, and has a vertical clearance of about 1cm from the child steel crash box body structure (2 a); the distance between the anchoring points of the flange plate (1a-1) at the bottom and the concrete foundation (4) and the driving road surface (7) is not less than 10 cm.
4. The child-mother type openable and closable central crash barrier system according to claim 1, wherein the movable sub-body crash barrier system (2) further comprises a longitudinal stiffening plate (2b) located inside the sub-body steel crash barrier structure (2a), a pulley block (2c) located at the bottom of the sub-body steel crash barrier structure (2a) and a guide rail box (2d), the guide rail box (2d) being embedded in the top of the concrete foundation (4); the guide rail box (2d) is internally provided with a concave guide rail groove (2d-1) matched with the pulley block (2c), and the concave guide rail groove (2d-1) is used as a longitudinal moving rail of the pulley block (2c) in a road central dividing strip.
5. The child-mother type openable and closable central crash barrier system according to claim 4, wherein the embedded traction system (3) comprises a motor (3a), a transmission pulley (3b), a transmission belt (3c), a traction cable (3d), an equipment foundation pit (3e), and a sump pit (3 f); the traction steel cable (3d) vertically and horizontally penetrates through a steel cable hole reserved in the guide rail box (2d) along a road central separation belt, and two ends of the traction steel cable (3d) are respectively anchored at anchoring points (2a-1) reserved at the bottoms of two ends of the sub-body steel anti-collision box body structure (2a), so that the transmission pulley (3b) longitudinally rolls along the concave guide rail groove (2d-1) under the action of longitudinal traction force provided by the motor (3a), and the longitudinal moving function of the sub-body steel anti-collision box body structure (2a) is realized.
6. The child-mother type openable and closable central anti-collision fence system according to claim 5, wherein the central anti-collision fence system further comprises a controller, and the motor (3a) is controlled by the controller to realize that a transmission belt (3c) drives a transmission pulley (3b) to rotate; and the transmission pulley (3b) pulls the traction steel cable (3d) after rotating, so as to provide longitudinal traction for the pulley block (2 c).
7. The primary-secondary type central anti-collision fence system capable of being automatically opened and closed according to claim 5, characterized in that a steel beam groove (2d-2) is formed in the center of the top of the guide rail box (2d), and the steel beam groove (2d-2) is arranged along the longitudinal length of the guide rail box (2 d); the guide rail box (2d) is longitudinally provided with a longitudinal slope, and accumulated water is drained into the water collecting pit (3 f).
8. The primary-secondary openable central crash barrier system according to any one of claims 1 to 7, wherein the central crash barrier system is normally closed, and two end positions of the secondary body steel crash barrier box body structure (2a) respectively extend into two adjacent crash high-strength steel plates (1 a); the automobile anti-collision box is in an open state under an emergency working condition, the sub-body steel anti-collision box body structure (2a) is completely embedded into the anti-collision high-strength steel plate (1a) through pulling, and a central separation zone with a certain width is reserved for vehicles to turn around and change lanes to run.
9. The primary-secondary openable central crash barrier system according to claim 8, wherein in the closed state, the end of the secondary steel crash box structure (2a) extends into the interior of the crash high-strength steel plate (1a) by not less than 1 m; when the box body is in an open state, the sub-body steel anti-collision box body structure (2a) is completely embedded into the anti-collision high-strength steel plate (1a), and a central separation belt with the width of 8m is reserved.
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| CN201911171109.0A CN111021290B (en) | 2019-11-22 | 2019-11-22 | Master-slave type openable central anti-collision fence system |
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| CN201911171109.0A CN111021290B (en) | 2019-11-22 | 2019-11-22 | Master-slave type openable central anti-collision fence system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115492033A (en) * | 2022-11-18 | 2022-12-20 | 四川九通智路科技有限公司 | Management method and system for intelligent highway central separation zone opening guardrail |
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| KR100837684B1 (en) * | 2007-01-29 | 2008-06-19 | (주)인테크 디자인 | Median strip comprised emergency u-turn area |
| WO2008098465A1 (en) * | 2007-02-14 | 2008-08-21 | Guozhu Ji | A transversely moveable road barricade |
| CN201296907Y (en) * | 2008-01-21 | 2009-08-26 | 栾斌 | Framework-type anti-collision movable guardrail |
| CN201785715U (en) * | 2009-12-08 | 2011-04-06 | 北京道从交通科技有限公司 | Anti-collision movable guardrail |
| KR101324690B1 (en) * | 2012-10-29 | 2013-11-01 | 공주대학교 산학협력단 | Mobile concrete median barrier for gate |
| CN205000272U (en) * | 2015-04-30 | 2016-01-27 | 中交瑞安(北京)交通技术有限公司 | Highway ball formula anticollision movable guardrail |
| EP3124703A1 (en) * | 2015-07-29 | 2017-02-01 | Kirchdorfer Fertigteilholding GmbH | Emergency opening guide wall element |
| KR101785678B1 (en) * | 2017-02-21 | 2017-10-17 | (주)에스알디코리아 | Central strip smart gate device |
| CN212270786U (en) * | 2019-11-22 | 2021-01-01 | 深圳市综合交通设计研究院有限公司 | Primary and secondary formula central authorities anticollision barrier system that can open and close |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115492033A (en) * | 2022-11-18 | 2022-12-20 | 四川九通智路科技有限公司 | Management method and system for intelligent highway central separation zone opening guardrail |
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