A road height limiting portal

Abstract

The application discloses a road height-limiting portal, which comprises a first alarm subsystem for alarming a super-high vehicle passing through the portal body, and specifically comprises: a flexible height-limiting chain 4 suspended below the cross beam 2 by a plurality of steel wires, the suspension height being the same as the designed height limit of the height-limiting portal; a plurality of alarm bells 3 arranged on the steel wires; a plurality of emergency disengaging devices located at the upper end of the steel wires and used for disengaging the steel wires from the cross beam 2 in the case that the super-high vehicle passes through the height-limiting portal without taking effective braking; and a second alarm subsystem for prewarning the super-high vehicle approaching the portal body, which is composed of an image collecting device, a control device and a warning light 5. The flexible super-high alarm device and the super-high prewarning device are combined to warn the super-high vehicle in multiple ways, so that sufficient braking time is ensured for the driver and major traffic accidents are prevented.

Description

Technical Field

[0001] This invention relates to the field of road height restriction facilities, and in particular to a road height restriction gantry. Background Technology

[0002] To reduce traffic disruptions from different directions, grade-separated intersections are generally used for road-to-road or road-to-railway crossings in my country. Overpasses spanning lower-level roads are frequently struck by oversized vehicles, not only disrupting traffic and damaging vehicles and goods, but also seriously threatening the bridge's structural safety and increasing the risk of major accidents. Currently, rigid height-limiting gantries are commonly used to prevent oversized vehicles from colliding with bridges. Some applications replace the crossbeams of rigid height-limiting gantries with flexible materials. However, the main drawback of existing height-limiting gantries is their limited warning mechanisms, which are insufficient for oversized vehicles to take effective braking measures.

[0003] Therefore, there is an urgent need to provide an improved road height restriction gantry that can predict vehicle height exceeding the limit and issue warnings through various measures, thereby enabling vehicles to slow down and brake in a timely manner to prevent major traffic accidents. Summary of the Invention

[0004] The present invention aims to provide a road height restriction gantry that can solve the above-mentioned technical problems.

[0005] According to one aspect of the present invention, a road height restriction gantry is provided, comprising: a gantry body composed of two side channel steel columns 1 and a crossbeam 2, and further comprising: a first alarm subsystem for alerting oversized vehicles passing through the gantry body, specifically comprising: a flexible height restriction chain 4, suspended below the crossbeam 2 by multiple steel wire ropes, the suspension height being the same as the design height limit of the height restriction gantry; multiple alarm bells 3, mounted on the steel wire ropes; multiple emergency detachment devices located at the upper end of the steel wire ropes for detaching the steel wire ropes from the crossbeam 2 when an oversized vehicle passes through the height restriction gantry without taking effective braking action; and a second alarm subsystem for warning of oversized vehicles approaching the gantry body, comprising an image acquisition device, a control device, and a warning light 5.

[0006] Preferably, the emergency detachment device includes a wire rope clamp, which is fixedly connected to the front face of the crossbeam 2 by a shear pin, the maximum shear force of which is:

[0007] ,in, For this maximum shear force, As a safety factor, its value ranges from 1.5 to 2.5. To design for maximum impact force, This is the length of the steel wire rope. The vehicle exceeds the height limit of the flexible height restriction chain 4.

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

[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 communicatively connected to the two image acquisition devices and uses the YOLO target detection algorithm to determine the vehicle's height and distance information, wherein: the distance information is: ,in, This refers to the horizontal distance information from the vehicle to the height-restriction gantry. The horizontal distance between the two image acquisition devices. The focal length of the image acquisition device. , These are the x-coordinates of the centers of the two vehicle bounding boxes for the same vehicle in the YOLO object detection algorithm; the height information is: ,in, For the vehicle's height information, , This represents the height of the bounding boxes of two vehicles representing the same vehicle in the YOLO object detection algorithm. This refers to the pixel resolution of the image acquisition device.

[0011] Preferably, the formula for calculating the vehicle bounding box is:

[0012]

[0013] in, , , , , , , , These represent the x-coordinate of the center, y-coordinate of the center, the width of the border, and the height of the border of the vehicle obtained by the two image acquisition devices. For the Sigmoid function, , , , , , , , These are the neural network outputs of the two vehicle bounding boxes from the YOLO object detection algorithm. , , , This refers to the width and height of the two anchor frames in the YOLO object detection algorithm. , , , These are the coordinates of the top left corner of the two grids, respectively.

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

[0015] Preferably, the warning light 5 changes its lighting mode according to the control device: when the control device does not detect the oversized vehicle at both the far first detection distance and the near second detection distance, the warning light 5 remains constantly lit; when the control device detects the oversized vehicle at the first detection distance, the warning light 5 flashes slowly; when the control device detects the oversized vehicle at the second detection distance, the warning light 5 flashes rapidly.

[0016] Preferably, the main body of the gantry also includes: a diagonal bracing column, located on the back side of the height-limiting gantry, with one end fixedly connected to the top of the channel steel column 1 and the other end fixedly connected to the road surface.

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

[0018] This invention discloses a road height restriction gantry, comprising: a first alarm subsystem for alerting oversized vehicles passing the gantry body, specifically including: a flexible height restriction chain 4, suspended below a crossbeam 2 by multiple steel wire ropes, the suspension height being the same as the design height limit of the height restriction gantry; multiple alarm bells 3, mounted on the steel wire ropes; and multiple emergency detachment devices located at the upper end of the steel wire ropes, used to detach the steel wire ropes from the crossbeam 2 if an oversized vehicle passes the height restriction gantry without taking effective braking action; and a second alarm subsystem for warning of oversized vehicles approaching the gantry body, consisting of an image acquisition device, a control device, and warning lights 5. By combining the flexible oversized alarm device and the oversized warning device, multiple methods are used to warn oversized vehicles, ensuring drivers have sufficient braking time and preventing major traffic accidents. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

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

[0021] Figure 2 This is a side view of a height-limiting gantry according to an embodiment of the present invention;

[0022] The components include: 1. channel steel column; 2. crossbeam; 3. alarm bell; 4. flexible height limit chain; and 5. warning light. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Reference will now be made in detail to various embodiments of the 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 with reference to their location in the exemplary embodiments shown in the figures.

[0025] Figure 1-2 The figures show an elevation view and a side view of a height restriction gantry according to an embodiment of the present invention. As shown, the embodiment of the present invention provides a road height restriction gantry, including: a gantry body composed of two channel steel columns 1 and a crossbeam 2; a first alarm subsystem for warning over-height vehicles passing through the gantry body, specifically including: a flexible height restriction chain 4, suspended below the crossbeam 2 by multiple steel wire ropes, the suspension height being the same as the design height limit of the height restriction gantry; multiple alarm bells 3, installed on the steel wire ropes; multiple emergency detachment devices located at the upper end of the steel wire ropes, used to detach the steel wire ropes from the crossbeam 2 when an over-height vehicle passes through the height restriction gantry without taking effective braking action; and a second alarm subsystem for warning of over-height vehicles approaching the gantry body, consisting of an image acquisition device, a control device, and a warning light 5.

[0026] In related technologies, the principle of height restriction gantries is to block or warn oversized vehicles when they pass over the gantry. On the one hand, if the driver applies braking measures after hitting the height restriction facility, the impact on the oversized vehicle is significant, easily causing traffic accidents. On the other hand, the height restriction gantry is also easily damaged. The height restriction gantry in this embodiment of the invention has two aspects: first, it is equipped with a first alarm subsystem, which improves the height restriction facility to a flexible height restriction chain and adds an alarm bell to reduce the impact when colliding with the height restriction facility; second, it is additionally equipped with a second alarm subsystem to provide oversized warning. The two alarm subsystems are combined to form a comprehensive oversized alarm system.

[0027] According to an embodiment of the present invention, the flexible height restriction chain is set at the same height as the design height restriction. The design height restriction should be less than the height of the upper bridge in front of the driving direction, and the height of the crossbeam should also be less than or equal to the height of the upper crossbeam. The rigid crossbeam serves as the last line of defense to ensure that oversized vehicles are intercepted.

[0028] According to an embodiment of the present invention, the emergency detachment device includes a wire rope clamp, which is fixedly connected to the front face of the crossbeam 2 by a shear pin, the maximum shear force of which is:

[0029] ,in, For this maximum shear force, As a safety factor, its value ranges from 1.5 to 2.5. To design for maximum impact force, This is the length of the steel wire rope. The vehicle exceeds the height limit of the flexible height restriction chain 4.

[0030] According to an embodiment of the present invention, the emergency detachment device further includes: a sensing device for sensing whether the shear pin has detached from the crossbeam 2; and a self-shearing device connected to the sensing device, wherein when more than 1 / 4 of the shear pins detach from the crossbeam, the self-shearing device controls the disconnection of the remaining shear pins from the crossbeam 2.

[0031] In related technologies, even with flexible height restriction facilities, oversized vehicles can still easily damage the height restriction facilities or other rigid structures of the height restriction gantry. This invention provides an emergency detachment device using shear pins as connecting components, which can disconnect the device from the crossbeam of the height restriction gantry when the vehicle impact force is large. Furthermore, when the flexible height restriction chain is partially damaged, it can sag to a height that affects normal vehicle passage. This invention uses a sensing device to detect the number of shear pins detached from the crossbeam. Specifically, a gravity sensor can be used to determine the increase in force on each shear pin to determine the number of detached shear pins. When the number of detached pins exceeds 1 / 4, it means that the passage of the road will be severely obstructed. At this time, the self-shearing device is activated to disconnect the remaining shear pins, allowing the steel cable, the flexible height restriction chain below, and the alarm bell to detach, ensuring normal vehicle passage.

[0032] According to an embodiment of the present invention, 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.

[0033] According to an embodiment of the present invention, the control device is communicatively connected to two image acquisition devices and uses the YOLO target detection algorithm to determine the vehicle's height and distance information, wherein: the distance information is: ,in, This refers to the horizontal distance information from the vehicle to the height-restriction gantry. The horizontal distance between the two image acquisition devices. The focal length of the image acquisition device. , These are the x-coordinates of the centers of the two vehicle bounding boxes for the same vehicle in the YOLO object detection algorithm; the height information is: ,in, For the vehicle's height information, , This represents the height of the bounding boxes of two vehicles representing the same vehicle in the YOLO object detection algorithm. This refers to the pixel resolution of the image acquisition device.

[0034] According to an embodiment of the present invention, the formula for calculating the vehicle bounding box is as follows:

[0035]

[0036] in, , , , , , , , These represent the x-coordinate of the center, y-coordinate of the center, the width of the border, and the height of the border of the vehicle obtained by the two image acquisition devices. For the Sigmoid function, , , , , , , , These are the neural network outputs of the two vehicle bounding boxes from the YOLO object detection algorithm. , , , This refers to the width and height of the two anchor frames in the YOLO object detection algorithm. , , , These are the coordinates of the top left corner of the two grids, respectively.

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

[0038] According to an embodiment of the present invention, the warning light 5 changes its lighting mode according to the control device: when the control device does not detect the oversized vehicle at both a distant first detection distance and a closer second detection distance, the warning light 5 remains constantly lit; when the control device detects the oversized vehicle at the first detection distance, the warning light 5 flashes slowly; when the control device detects the oversized vehicle at the second detection distance, the warning light 5 flashes rapidly.

[0039] In related technologies, constantly lit warning lights or LED screens are used to indicate height restriction facilities ahead, but constantly lit warning lights are not easily noticed. This invention combines the YOLO target detection algorithm with a warning light that can change its illumination mode. It identifies vehicle height information at both near and far detection positions and calculates the vehicle height using a binocular YOLO algorithm. When an oversized vehicle is detected at the first detection distance, the warning light changes from constantly lit to slowly flashing. When an oversized vehicle is detected at the second detection distance, the warning light further changes to rapidly flashing, enabling oversized vehicles to take braking measures as early as possible to avoid colliding with the height restriction gantry.

[0040] According to an embodiment of the present invention, the main body of the gantry further includes: a diagonal bracing column, 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 an embodiment of the present invention, both the diagonal bracing column and the channel steel column 1 are fixedly connected to the road surface by anchor bolts, which are embedded in the road surface by pouring concrete.

[0042] In related technologies, height restriction gantry is prone to tilting backward and affecting road traffic when it is hit by an oversized vehicle. In this embodiment of the invention, diagonal bracing columns are added to the height restriction gantry, and the channel steel columns on both sides and the diagonal bracing columns are fixed to the road surface by anchor bolts and concrete pouring, which increases the stability of the height restriction gantry structure.

[0043] The present invention has the following effects:

[0044] (1) Combining multiple alarm methods to avoid secondary accidents caused by collisions with the height restriction gantry;

[0045] (2) Use flexible height restriction devices to reduce the impact on the vehicle involved in 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 main body of the gantry to save maintenance funds.

[0047] The above embodiments are merely examples to clearly illustrate the present invention and are not intended to limit the implementation of the invention. Those skilled in the art can make other variations or modifications based on the following description, and these variations, modifications, substitutions, and alterations arising from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A road height restriction gantry, comprising a gantry body composed of two side channel steel columns (1) and a crossbeam (2), characterized in that, It also includes a first alarm subsystem and a second alarm subsystem; in: The first alarm subsystem is used to alert that oversized vehicles are passing through the gantry body, and specifically includes a flexible height-limiting chain (4), multiple alarm bells (3) and multiple emergency detachment devices; in: The flexible height-limiting chain (4) is suspended below the crossbeam (2) by multiple steel wire ropes, and the suspension height is the same as the design height limit of the height-limiting gantry. The plurality of alarm bells (3) are mounted on the steel wire rope; The plurality of emergency detachment devices are located at the upper end of the wire rope and are used to detach the wire rope from the crossbeam (2) when an over-height vehicle passes through the height restriction gantry without taking effective braking measures; The emergency detachment device includes a wire rope clamp, a sensing device, and a self-cutting device. in: The wire rope clamp is fixedly connected to the front face of the crossbeam (2) by a shear pin, and the maximum shear resistance of the shear pin is: ； in, The maximum shear force, As a safety factor, its value ranges from 1.5 to 2.

5. To design for maximum impact force, The length of the wire rope is... The height of the over-height vehicle exceeding the height of the flexible height-limiting chain (4) The sensing device is used to sense whether the shear pin is disengaged from the crossbeam (2). The self-cutting device is connected to the sensing device. When more than 1 / 4 of the shear pins are disengaged from the crossbeam, the self-cutting device controls the disconnection of the other shear pins from the crossbeam (2). The second alarm subsystem, used to warn of the over-height vehicle approaching the gantry body, consists of an image acquisition device, a control device, and a warning light (5); 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; The control device is communicatively connected to the two image acquisition devices and uses the YOLO target detection algorithm to determine the vehicle's height and distance information, wherein: The distance information is: ； in, The distance information from the vehicle to the height-limiting gantry along the horizontal direction. The horizontal distance between the two image acquisition devices is [missing information]. The focal length of the image acquisition device is [missing information]. , These are the x-coordinates of the centers of the two vehicle bounding boxes for the same vehicle in the YOLO object detection algorithm; The height information is: ； in, The height information of the vehicle. , This represents the height of the bounding boxes of two vehicles representing the same vehicle in the YOLO object detection algorithm. The pixel resolution of the image acquisition device; The formula for calculating the vehicle boundary box is: ； in, , , , , , , , The coordinates of the center x-coordinate, center y-coordinate, border width, and border height of the vehicle bounding box obtained by the two image acquisition devices are respectively. For the Sigmoid function, , , , , , , , These are the neural network outputs of the two vehicle bounding boxes of the YOLO object detection algorithm, respectively. , , , The anchor frame width and anchor frame height are the two anchor frames in the YOLO object detection algorithm. , , , These are the coordinates of the top left corner of the two grids, respectively.

2. The road height restriction gantry according to claim 1, characterized in that, The warning light (5) is located at the upper end of the crossbeam (2) and is communicatively connected to the control device.

3. The road height restriction gantry according to claim 2, characterized in that, The warning light (5) changes its lighting mode according to the control device: When the control device fails to detect the over-height vehicle at both the far first detection distance and the near second detection distance, the warning light (5) remains constantly 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 rapidly.

4. The road height restriction gantry according to claim 1, characterized in that, The gantry body also includes: The diagonal bracing column is located on the back side of the height-limiting gantry, with one end fixedly connected to the top of the channel steel column (1) and the other end fixedly connected to the road surface.

5. The road height restriction gantry according to claim 4, characterized in that, The inclined support column and the channel steel column (1) are both fixedly connected to the road surface by anchor bolts, which are embedded in the road surface by pouring concrete.

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