Double-resistance type expressway protection buffer device

Abstract

The invention discloses a double-resistance type expressway protection buffer device which comprises a stand column, a connecting arm, a sliding sleeve, a spring and a guardrail, and the sliding sleeve comprises a first sliding sleeve body and a second sliding sleeve body. The stand columns are vertically installed in the middle of an isolation belt of an expressway or on the two sides of the expressway. A clamping ring, a first sliding sleeve, a second sliding sleeve and a blocking piece are sequentially arranged on the stand column from bottom to top, the clamping ring and the blocking pieceare fixedly connected with the stand column, and the first sliding sleeve and the second sliding sleeve are connected in a relative sliding mode in the axial direction of the stand column. A spring is arranged between the clamping ring and the first sliding sleeve, and the two ends of the spring are connected with the clamping ring and the first sliding sleeve; a spring is arranged between the second sliding sleeve and the blocking piece, and the two ends of the spring are connected with the second sliding sleeve and the blocking piece. By means of the structural design, the buffering distance of a vehicle when the vehicle collides with the guardrails is increased, the guardrails shrink to drive the opposite guardrails to get close to the middle portion, the breaking strength is improvedthrough superposition of the two layers of guardrails, and a great positive effect is achieved for reducing the accident level.

Description

technical field [0001] The invention relates to the field of energy-absorbing structures for highway guardrails, in particular to a double-resistance highway protection buffer device. Background technique [0002] Expressway, referred to as expressway, refers to a highway specially designed for cars to travel at high speed. Expressways have different regulations in different countries and regions, in different eras, and in different research and academic fields. According to China's "Technical Standards for Highway Engineering" (JTG B01-2014): expressways are multi-lane roads that are designed for cars to drive in separate directions and in separate lanes, and all access and exit are controlled. The annual average daily design traffic volume of the expressway should be more than 15,000 passenger cars, and the design speed should be 80 to 120 kilometers per hour. As of December 28, 2018, the total mileage of expressways in my country has reached 140,000 kilometers, ranking ...

AI Technical Summary

Problems solved by technology

[0006] However, the current highway guardrail has a very limited deformation distance when it is hit. Generally, only the corrugated steel guardrail has the ability to absorb energy, and other structures (such as columns) need to maintain their characteristic strength to avoid When the vehicle hits the highway guardrail, there is no danger of rushing out (or rushing into the opposite lane); this leads to another problem. Due to the short energy absorption distance, when the vehicle hits the guardrail, In a very short distance, the speed will be reduced from the maximum to zero (that is, parking), which will cause the vehicle to deform very seriously after the impact, and most of the cases will cause car crashes and fatalities. Generally, it is the cause of a major or extraordinarily serious accident. In the final analysis, it is because the effective energy absorption distance is short, and the braking distance after the vehicle hits is short, resulting in very serious consequences.

[0007] Secondly, the speed of vehicles on the expressway is 100-120KM / h, but the quality of the vehicles is very different, such as trucks, the vehicles are large and heavy, and their inertia is large. The isolation belt guardrail makes it easy for trucks to collide with the opposite lane, and the vehicles in the opposite lane are traveling at high speed. Once they collide with the opposite lane, the consequences will be very serious, and the accidents caused are all serial accidents; saw statistics, In 2019, a total of 238,351 road traffic accidents occurred across the country (only including those reported), resulting in 67,759 deaths, 275,125 injuries, and direct property losses of 910 million yuan

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