Rotational Deck Shock-Reducing Front Block for Emergency Return
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Solution Overview
Problem
Existing emergency vehicle return apparatuses for median strips have structural drawbacks, including complex construction, vulnerability to traffic safety during collisions, difficulty in installing due to height and width differences in road surfaces, and inadequate collision resistance, leading to deformation and increased scattering of components during vehicle collisions.
Innovation Solution
A rotational deck with a shock-reducing front block is designed, featuring a front block part fastened to the angle decks via a link unit, allowing vehicles to bounce out at an angle during collisions, reducing structural deformation and impact on occupants, and incorporating a hydraulic cylinder load to minimize lifting force after emergencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the emergency vehicle return apparatus is rotated about one point as an axis, then the vehicle can return to the opposite roadway, but the apparatus occupies a large space on the road and the constructional structure becomes complicated
Solution Approach 1:
The emergency vehicle return apparatus is divided into multiple rotational decks that can rotate independently about their own axes rather than as a single large structure. Each rotational deck includes angle decks that rotate symmetrically toward two opposite roads, allowing the vehicle to return without requiring a large overall space or complex centralized control structure.
2Ease of operation
If the emergency vehicle return apparatus is slid through the median strip, then the vehicle can return, but separate sliding and fixing devices are required making the constructional structure complicated
Solution Approach 1:
The rotational deck combines the functions of sliding and fixing into a single integrated structure. The angle decks are supported by angle deck frames that include both sliding capabilities along the median strip and fixing mechanisms, eliminating the need for separate sliding and fixing devices while maintaining the vehicle return function.
3Ease of operation
If the emergency vehicle return apparatus is configured to be rotatable or slidable, then the vehicle can return in emergency, but the configuration is vulnerable to traffic safety at the time of a vehicle collision because there is no supporting force on a ground layer at normal times
Solution Approach 1:
The angle deck frames are designed with a ground layer supporting structure that is preliminarily installed and ready to provide supporting force during normal times. This preliminary action ensures that when a vehicle collision occurs, the ground layer can immediately provide the necessary support and stabilization, preventing the vulnerable configuration of rotatable or slidable structures.
4Device complexity
If the angle decks are installed vertically, then the structure is simple, but the collision resistance strength is low and the structure deforms or fractures during vehicle collision
Solution Approach 1:
The angle decks are installed at asymmetric angles rather than vertically, with the angle deck frames configured to provide both vertical support and lateral collision resistance. The asymmetric arrangement of the angle decks and their frames creates a structure that is simpler overall while significantly improving collision resistance strength by distributing impact forces more effectively.
5Ease of operation
If the emergency vehicle return apparatus is installed in accordance with a difference in height in a width direction and longitudinal direction of paved surface, then the apparatus can operate smoothly, but it is difficult to install due to height and width differences
Solution Approach 1:
The angle deck frames are designed with dynamic adjustment capabilities that allow them to adapt to different height differences in the paved surface. The frames can be adjusted during installation to accommodate variations in elevation, enabling smooth operation of the emergency vehicle return apparatus while simplifying the installation process by eliminating the need for precise pre-positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces structural deformation and scattering of components, minimizes impact on vehicle occupants, and enables safe vehicle return by allowing vehicles to naturally rotate away from collisions, enhancing safety and operational efficiency.
Implementation Method 1
a pair of angle decks symmetrically installed and rotated by hydraulic cylinders, respectively
Implementation Method 2
reduces impact when a vehicle collides with the front block part
Implementation Method 3
allows the vehicle to bounce out while rotating at an angle corresponding to a collision incident angle
Implementation Method 4
a front block part fastened, by a link unit, to a lower portion of each of a pair of symmetrically installed angle decks
Data Source
AI summary
A rotational deck which is used for an emergency vehicle return apparatus in a section of a median strip of a road, includes a pair of angle decks configured to be folded up to serve as the median strip in a normal state, and be unfolded down by hydraulic cylinders toward a surface of the road to serve as a vehicle pass in an event of emergency, and a front block part coupled, by a link unit, to a lower portion of each angle deck. The front block part includes a front block having a shape to reduce a shock from a collision, one or more front block frames configured to provide rigidity by supporting a rear surface of the front block, and a bottom frame configured to support the front block and a lower portion of the front block frame.