Road height limit alarm system

Abstract

The invention discloses a road height-limiting alarm system, which comprises a first alarm subsystem used for alarming an over-high vehicle to pass through a portal frame main body, and specifically comprises a flexible height-limiting chain 4 which is suspended below a cross beam 2 through a plurality of steel wire ropes, and the suspension height is the same as the designed height limit of a height-limiting portal frame; the alarm bells 3 are arranged on the steel wire rope; the emergency separating devices are positioned at the upper ends of the steel wire ropes and are used for separating the steel wire ropes from the cross beam 2 under the condition that an ultrahigh vehicle passes through the height limiting portal frame and does not adopt effective braking; and the second alarm subsystem is used for early warning that the over-height vehicle approaches the portal frame main body and is composed of an image acquisition device, a control device and a warning lamp 5, and by combining a flexible over-height alarm device and an over-height early warning device, the over-height vehicle is warned in multiple modes, it is guaranteed that a driver has sufficient braking time, and major traffic accidents are prevented.

Description

Technical Field

[0001] The invention relates to the field of road height limit facilities, in particular to a road height limit alarm system. Background Art

[0002] In order to reduce traffic interference in different directions, the intersections between roads and roads or roads and railways in my country generally adopt the form of three-dimensional intersections. The upper bridges crossing the lower roads are often hit by individual over-height vehicles, which not only blocks traffic and causes damage to vehicles and goods, but also seriously threatens the structural safety of the bridge itself, and is prone to cause major traffic accidents. In order to prevent over-height vehicles from hitting bridges, rigid height limit gantries are currently more commonly used, and there are also applications in which the crossbeams of rigid height limit gantries are replaced with flexible materials. However, the main shortcoming of the height limit gantries in the prior art is that the reminder measures are relatively simple, resulting in insufficient effective braking measures for over-height vehicles.

[0003] Therefore, it is urgent to provide an improved road height limit alarm system that can predict the vehicle's overheight and use a variety of measures to warn, so that the vehicle can slow down and brake in time to prevent major traffic accidents. Summary of the invention

[0004] The present invention aims to provide a road height limit alarm system which can solve the above technical problems.

[0005] According to one aspect of the present invention, there is provided a road height limit alarm system, comprising: a gantry body consisting of channel steel columns 1 on both sides and a crossbeam 2, and also comprising: a first alarm subsystem, used to warn of an over-height vehicle passing through the gantry body, specifically comprising: a flexible height limit chain 4, suspended below the crossbeam 2 by a plurality of steel wire ropes, the suspension height being the same as the designed height limit of the height limit gantry; a plurality of alarm bells 3, arranged on the steel wire rope; a plurality of emergency detachment devices, located at the upper end of the steel wire rope, used to detach the steel wire rope from the crossbeam 2 when an over-height vehicle passes through the height limit gantry without taking effective braking; a second alarm subsystem, used to warn that the over-height vehicle is approaching the gantry body, and consisting of an image acquisition device, a control device and a warning light 5.

[0006] Preferably, the emergency release device comprises a wire rope clamp, which is fixedly connected to the vehicle-facing surface of the crossbeam 2 by a shear pin, and the maximum shear resistance of the shear pin is:

[0007] Among them, F MAX is the maximum shear force, k is the safety factor, and its value range is 1.5-2.5, F d To design the maximum impact force, L is the length of the steel wire rope, and h is the height of the super-high vehicle exceeding the flexible height-limiting chain 4.

[0008] Preferably, the emergency detachment device also includes: a sensing device for sensing whether the shear pin is detached from the beam 2; a self-shearing device connected to the sensing device, and when more than 1 / 4 of the shear pins are detached from the beam, the self-shearing device controls the disconnection of the other shear pins from the beam 2.

[0009] Preferably, two image acquisition devices are symmetrically arranged at the upper end of the crossbeam 2, and the image acquisition devices are cameras or high-speed cameras.

[0010] Preferably, the control device is in communication connection with the two image acquisition devices, and adopts the YOLO target detection algorithm to determine the height information and distance information of the vehicle, wherein: the distance information is: Wherein, D is the distance information from the vehicle to the height-limiting gantry in the horizontal direction, b is the horizontal distance between the two image acquisition devices, f is the focal length of the image acquisition device, and x is 1 、x 2 They are the central horizontal coordinates of the two vehicle bounding boxes of the same vehicle in the YOLO target detection algorithm; the height information is: Among them, H is the height information of the vehicle, h 1 、h 2 is the height of the two vehicle bounding boxes of the same vehicle in the YOLO target detection algorithm, and p is the pixel resolution of the image acquisition device.

[0011] Preferably, the calculation formula of the vehicle bounding box is:

[0012]

[0013] Among them, x 1 ,y 1 、w 1 、h 1 、x 2 ,y 2 、w 2 、h 2 are the central abscissa, central ordinate, frame width and frame height of the vehicle boundary frame obtained by the two image acquisition devices, σ is the Sigma function, t x1 ,t y1 ,t w1 ,t h1 ,t x2 ,t y2 ,t w2 ,t h2 are the neural network outputs of the two vehicle bounding boxes of the YOLO target detection algorithm, p w1 、p h1 、p w2 、p h2is the anchor box width and anchor box height of the two anchor boxes of the YOLO target detection algorithm, c x1 、c y1 、c x2 、c y2 They are the upper left corner coordinates of the two grids respectively.

[0014] Preferably, the warning light 5 is disposed at the upper end of the crossbeam 2 and is communicatively connected with the control device.

[0015] Preferably, the warning light 5 changes the lighting mode according to the control device: when the control device fails to detect the over-high vehicle at both the farther first detection distance and the closer second detection distance, the warning light 5 remains on; when the control device detects the over-high vehicle at the first detection distance, the warning light 5 flashes slowly; when the control device detects the over-high vehicle at the second detection distance, the warning light 5 flashes quickly.

[0016] Preferably, the gantry body further comprises: an oblique support column, which is located on the back side of the height-limiting gantry, one end of which is fixedly connected to the top of the channel steel column 1, and the other end of which is fixedly connected to the road surface.

[0017] Preferably, the diagonal bracing column and the channel steel column 1 are fixedly connected to the road surface by anchor bolts, and the anchor bolts are embedded in the road surface by pouring concrete.

[0018] The present invention discloses a road height limit alarm system, comprising: a first alarm subsystem, used for alarming an over-height vehicle passing through the gantry body, specifically comprising: a flexible height limit chain 4, suspended below the crossbeam 2 by a plurality of steel wire ropes, the suspension height being the same as the designed height limit of the height limit gantry; a plurality of alarm bells 3, arranged on the steel wire rope; a plurality of emergency detachment devices, located at the upper end of the steel wire rope, used for detaching the steel wire rope from the crossbeam 2 when the over-height vehicle passes through the height limit gantry without taking effective braking; a second alarm subsystem, used for warning the over-height vehicle approaching the gantry body, consisting of an image acquisition device, a control device and a warning light 5, and by combining the flexible over-height alarm device with the over-height warning device, the over-height vehicle can be warned in a variety of ways, thereby ensuring that the driver has sufficient braking time and preventing major traffic accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 is a schematic elevation diagram of a height-limited gantry according to an embodiment of the present invention;

[0021] Figure 2A side schematic diagram of a height-limited gantry according to an embodiment of the present invention;

[0022] Among them: 1. Channel steel column; 2. Crossbeam; 3. Alarm bell; 4. Flexible height limit chain; 5. Warning light. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For ease of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0025] Figure 1-2 The elevation diagram and the side diagram of the height limit gantry according to the embodiment of the present invention are respectively shown. As shown in the figure, the embodiment of the present invention provides a road height limit alarm system, including a road height limit alarm system, including: a gantry body composed of channel steel columns 1 and a crossbeam 2 on both sides, and also including: a first alarm subsystem, used to alarm an over-height vehicle passing through the gantry body, specifically including: a flexible height limit chain 4, suspended below the crossbeam 2 by multiple steel wire ropes, and the suspension height is the same as the designed height limit of the height limit gantry; multiple alarm bells 3, arranged on the steel wire rope; multiple emergency detachment devices, located at the upper end of the steel wire rope, used to detach the steel wire rope from the crossbeam 2 when the over-height vehicle passes through the height limit gantry without taking effective braking; a second alarm subsystem, used to warn that the over-height vehicle is approaching the gantry body, composed of an image acquisition device, a control device and a warning light 5.

[0026] In the related art, the principle of the height limit gantry is to block or warn the super-height vehicle when it passes through the gantry. On the one hand, the driver takes braking measures after hitting the height limit facility, which has a greater impact on the super-height vehicle and is easy to cause a traffic accident. On the other hand, the height limit gantry is also easily damaged. The height limit gantry of the embodiment of the present invention, on the one hand, is provided with a first alarm subsystem, the height limit facility is improved into a flexible height limit chain and an alarm bell is installed to reduce the impact when colliding with the height limit facility. On the other hand, a second alarm subsystem is additionally provided to provide an over-height early warning. The two alarm subsystems are combined to form a strict over-height alarm system.

[0027] According to an embodiment of the present invention, the setting height of the flexible height limit chain is the same as the design height limit. The design height limit should be less than the height of the upper bridge in front of the driving direction. The height of the beam should also be less than or equal to the height of the upper beam. The rigid beam is used as the last line of defense to ensure that over-height vehicles are intercepted.

[0028] According to an embodiment of the present invention, the emergency release device includes a wire rope clamp, which is fixedly connected to the vehicle-facing surface of the crossbeam 2 through a shear pin, and the maximum shear resistance of the shear pin is:

[0029] Among them, F MAX is the maximum shear force, k is the safety factor, and its value range is 1.5-2.5, F d To design the maximum impact force, L is the length of the steel wire rope, and h is the height of the super-high vehicle exceeding the flexible height-limiting chain 4.

[0030] According to an embodiment of the present invention, the emergency detachment device also includes: a sensing device for sensing whether the shear pin is detached from the beam 2; and a self-shearing device connected to the sensing device. When more than 1 / 4 of the shear pins are detached from the beam, the self-shearing device controls the disconnection of the other shear pins from the beam 2.

[0031] In the related art, even if flexible height-limiting facilities are used, overheight vehicles are still prone to damage the height-limiting facilities or other rigid structures of the height-limiting gantry. The embodiment of the present invention provides an emergency disengagement device that uses shear pins as connecting components, which can disconnect it from the crossbeam of the height-limiting gantry when the impact force of the vehicle is large. In addition, when the flexible height-limiting chain is partially damaged, it will hang to a height that affects the normal passage of vehicles. The embodiment of the present invention uses a sensing device to sense the number of shear pins that have detached from the crossbeam. Specifically, the gravity sensing device can be used to determine the increase in the force on each shear pin to determine the number of shear pins that have detached from the crossbeam. When the number of detachments exceeds 1 / 4, it means that the passage of the road will be severely hindered. At this time, the self-shearing device is activated to disconnect the remaining shear pins, which can cause the steel wire rope and the flexible height-limiting chain and alarm bell below to fall off, ensuring the normal passage of vehicles.

[0032] According to an embodiment of the present invention, two image acquisition devices are symmetrically arranged on the upper end of the crossbeam 2, and the image acquisition devices are cameras or high-speed cameras.

[0033] According to an embodiment of the present invention, the control device is connected to the two image acquisition devices in communication, and uses the YOLO target detection algorithm to determine the height information and distance information of the vehicle, wherein: the distance information is: Wherein, D is the distance information from the vehicle to the height-limiting gantry in the horizontal direction, b is the horizontal distance between the two image acquisition devices, f is the focal length of the image acquisition device, and x is 1 、x 2 They are the central horizontal coordinates of the two vehicle bounding boxes of the same vehicle in the YOLO target detection algorithm; the height information is: Among them, H is the height information of the vehicle, h 1 、h2 is the height of the two vehicle bounding boxes of the same vehicle in the YOLO target detection algorithm, and p is the pixel resolution of the image acquisition device.

[0034] According to an embodiment of the present invention, the calculation formula of the vehicle boundary box is:

[0035]

[0036] Among them, x 1 ,y 1 、w 1 、h 1 、x 2 ,y 2 、w 2 、h 2 are the central abscissa, central ordinate, frame width and frame height of the vehicle boundary frame obtained by the two image acquisition devices, σ is the Sigma function, t x1 ,t y1 ,t w1 ,t h1 ,t x2 ,t y2 ,t w2 ,t h2 are the neural network outputs of the two vehicle bounding boxes of the YOLO target detection algorithm, p w1 、p h1 、p w2 、p h2 is the anchor box width and anchor box height of the two anchor boxes of the YOLO target detection algorithm, c x1 、c y1 、c x2 、c y2 They are the upper left corner coordinates of the two grids respectively.

[0037] According to the embodiment of the present invention, the warning light 5 is disposed at the upper end of the crossbeam 2 and is communicatively connected with the control device.

[0038] According to an embodiment of the present invention, the warning light 5 changes the lighting mode according to the control device: when the control device fails to detect the over-high vehicle at both the farther first detection distance and the closer second detection distance, the warning light 5 remains on; when the control device detects the over-high vehicle at the first detection distance, the warning light 5 flashes slowly; when the control device detects the over-high vehicle at the second detection distance, the warning light 5 flashes quickly.

[0039] In the related art, a constantly lit warning light or LED screen is set to alert the height-limited facilities ahead, but a constantly lit warning light is not easy to notice. The embodiment of the present invention combines the YOLO target detection algorithm and a warning light with a variable lighting mode to identify vehicle height information at two detection positions, far and near, respectively, and calculate the vehicle height through a binocular YOLO algorithm. When an over-height vehicle appears at a first detection distance in the distance, the warning light changes from being constantly lit to slowly flashing. When an over-height vehicle appears at a second detection distance in the near distance, the warning light further changes to quickly flashing, which enables the over-height vehicle to take braking measures as soon as possible to avoid hitting the height-limiting gantry.

[0040] According to an embodiment of the present invention, the gantry body further comprises: a diagonal support column, which is located on the back side of the height-limiting gantry, one end of which is fixedly connected to the top of the channel steel column 1, and the other end of which is fixedly connected to the road surface.

[0041] According to the embodiment of the present invention, the diagonal bracing column and the channel steel column 1 are both fixedly connected to the road surface by anchor bolts, and the anchor bolts are embedded in the road surface by pouring concrete.

[0042] In the related art, when the height limit gantry is hit by an overheight vehicle, it is easy to fall backwards and affect the traffic on the road. The embodiment of the present invention adds diagonal bracing columns to the height limit gantry, and fixes the channel steel columns and diagonal bracing columns on both sides to the road surface by anchor bolts and poured concrete, thereby increasing the stability of the height limit gantry structure.

[0043] The present invention has the following effects:

[0044] (1) Multiple alarm modes are combined to avoid secondary accidents caused by collision of height-limited gantry;

[0045] (2) Use flexible height limiting devices to reduce the impact on the vehicle causing the accident;

[0046] (3) Simplify the main structure of the gantry and set up a height-limiting flexible chain that can be detached from the gantry body to save maintenance funds.

[0047] The above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications may be made based on the following description, and these various changes, modifications, substitutions and deformations derived from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A road height limit alarm system, comprising a gantry body composed of channel steel columns (1) and a crossbeam (2) on both sides, characterized in that: Also includes: The first alarm subsystem is used to warn that an over-height vehicle passes through the gantry body, specifically including: A flexible height-limiting chain (4) is suspended below the crossbeam (2) through a plurality of steel wire ropes, and the suspension height is the same as the designed height limit of the height-limiting gantry; A plurality of alarm bells (3) are arranged on the steel wire rope; A plurality of emergency release devices, located at the upper end of the steel wire rope, used to release the steel wire rope from the crossbeam (2) when an overheight vehicle passes through the height-limiting gantry without taking effective braking measures; The second alarm subsystem is used to warn that the super-high vehicle is approaching the gantry body, and is composed of an image acquisition device, a control device and a warning light (5).

2. The road height limit warning system according to claim 1 is characterized in that: The emergency release device comprises a wire rope clamp, which is fixedly connected to the vehicle-facing surface of the cross beam (2) through a shear pin, and the maximum shear resistance of the shear pin is: Among them, F MAX is the maximum shear resistance, k is the safety factor, and its value range is 1.5-2.5, F d To design the maximum impact force, L is the length of the steel wire rope, and h is the height of the super-high vehicle exceeding the flexible height-limiting chain (4).

3. The road height limit warning system according to claim 2 is characterized in that: The emergency release device also includes: a sensing device for sensing whether the shear pin is detached from the crossbeam (2); A self-shearing device is connected to the sensing device. When more than 1 / 4 of the shear pins are detached from the cross beam, the self-shearing device controls the disconnection of the other shear pins from the cross beam (2).

4. The road height limit warning system according to claim 1, characterized in that: Two image acquisition devices are symmetrically arranged at the upper end of the crossbeam (2), and the image acquisition devices are video cameras or high-speed cameras.

5. The road height limit warning system according to claim 1, characterized in that: The control device is in communication with the two image acquisition devices and uses the YOLO target detection algorithm to determine the height information and distance information of the vehicle, wherein: The distance information is: Wherein, D is the distance information from the vehicle to the height-limiting gantry in the horizontal direction, b is the horizontal distance between the two image acquisition devices, f is the focal length of the image acquisition device, and x1 and x2 are respectively the central horizontal coordinates of the two vehicle boundary boxes of the same vehicle in the YOLO target detection algorithm; The height information is: Among them, H is the height information of the vehicle, h1 and h2 are the heights of two vehicle boundary boxes of the same vehicle in the YOLO target detection algorithm, and p is the pixel resolution of the image acquisition device.

6. The road height limit warning system according to claim 5, characterized in that: The calculation formula of the vehicle bounding box is: Wherein, x1, y1, w1, h1, x2, y2, w2, h2 are respectively the central abscissa, central ordinate, border width and border height of the vehicle boundary box obtained by the two image acquisition devices, σ is the Sigmoid function, t x1 ,t y1 ,t w1 ,t h1 ,t x2 ,t y2 ,t w2 ,t h2 are the neural network outputs of the two vehicle bounding boxes of the YOLO target detection algorithm, and p w1 、p h1 、p w2 、p h2 are the anchor box width and anchor box height of the two anchor boxes of the YOLO target detection algorithm, c x1 、c y1 、c x2 、c y2 They are the upper left corner coordinates of the two grids respectively.

7. The road height limit warning system according to claim 1, characterized in that: The warning light (5) is arranged at the upper end of the crossbeam (2) and is communicatively connected with the control device.

8. The road height limit warning system according to claim 7, characterized in that: The warning light (5) changes the lighting mode according to the control device: When the control device fails to detect the over-height vehicle at both the farther first detection distance and the closer second detection distance, the warning light (5) remains on; When the control device detects an over-height vehicle at the first detection distance, the warning light (5) flashes slowly; When the control device detects an over-height vehicle at the second detection distance, the warning light (5) flashes quickly.

9. The road height limit warning system according to claim 1, characterized in that: The door frame body also includes: The diagonal support column is located on the rear side of the height-limiting gantry, one end of which is fixedly connected to the top of the channel steel column (1), and the other end of which is fixedly connected to the road surface.

10. The road height limit warning system according to claim 9, characterized in that: The diagonal bracing columns and the channel steel columns (1) are both fixedly connected to the road surface via anchor bolts, and the anchor bolts are embedded in the road surface by pouring concrete.

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