We visited the barrier trials of the new generation at the Dmitrov avtopoligone. The spectacle is not for the faint of heart!
In 2009 at the initiative of the magazine “Behind the wheel” at the Dmitrov avtopoligone had an unusual crash test priors: a speed of 90 km/h it stuck in the guardrail at an angle of 20 degrees. Killed, that is, at once two hares: and the barrier is experienced, and tested the driver’s airbag, which had just appeared on the serial Prior.
Similar tests in 2009. Prior ducked beneath the wave profile, caught the wheel behind the prop and turned around. Design flaws of the fence there.Similar tests in 2009. Prior ducked beneath the wave profile, caught the wheel behind the prop and turned around. Design flaws of the fence there.
I was present when the crash test. A lot of impressions! After hitting Prior deployed — she ducked beneath the hammer, the wheel caught on one of the pillars. In the real crash it could be fatal for riders: even if overload upon impact is not prohibitive, in the sudden stopped across the road a car may hit another car.
And here I am again on the testing of road barriers a barrier is a new generation. This time as the victim selected more severe the Volga. Speed of 100 km/h, the same “counter” angle 20 degrees, but the Volga is not turned around, and went on a tangent. All because the sheet metal bump having a thickness of 4 mm, has not two, but three waves. The lower wave hanging close to the ground and prevented the Volga to duck under the barrier. Moreover, the car remained within the conditional dynamic corridor width of 5 meters. Typically, this space is enough to after hitting the fence not to be on the wrong side. And this is one of the requirements to such structures. Resist themselves mount: mounting bolts screwed into the concrete base that goes into the ground to a depth of 1 m.
GAZ‑31029 weighing about two tons beating on the barrier at 100 km/h. it is Important that the car remained within a dynamic corridor marked by painted lines. The corridor width of five meters.GAZ‑31029 weighing about two tons beating on the barrier at 100 km/h. it is Important that the car remained within a dynamic corridor marked by painted lines. The corridor width of five meters.
|Assessment of deformation of the fence. It is not broken, pillars stood, tears of the wave profile either. After obtaining the certificate, will begin production of fences.Assessment of deformation of the fence. It is not broken, pillars stood, tears of the wave profile either. After obtaining the certificate, will begin production of fences.||Barrier for the first time assembled on biswamoy technology 15% cheaper than existing analogues and 29% lighter thanks to the optimization height step stands and thickness of steel.Barrier for the first time assembled on biswamoy technology 15% cheaper than existing analogues and 29% lighter thanks to the optimization height step stands and thickness of steel.|
The main feature of the fence of this model is the lack of welded joints. This greatly simplifies and speeds up installation. Moreover, as shown in the test results, not at the expense of safety, which remains the main criterion. Barriers compared to the barriers other types the most effective in terms of minimising the consequences of accidents. Not only are they partially absorb the energy of impact, but will prevent significant separation of fragments of the machine, which can exacerbate the consequences of the accident. Only such fences are permitted on the most dangerous sections of the road. The existing standard, for example, prohibits the use of wire fences, cheaper, on roads I and II of the technical categories — motorways, high-speed and some ordinary roads. Only barrier! The same applies to bridges and overpasses. In the suburbs in an experiment on decision of the traffic police still installing rope fencing. Barrier the barrier, the cost of which has been reduced due to biswamoy Assembly would become in this case an alternative.
In General there are two types of fences — the road (holding power 130-500 kJ) and bridge (up to 600 kJ). For ease of understanding: impact energy 600 kJ develops a shell weighing 20 tons at a speed of 28 km/h. But it is at a right angle. In reality this happens rarely. Therefore, the collision is performed under an angle of 20 degrees at higher speeds. And then the car will not do. Here at the starting position roll the bus.
Bus speed — 70 km/h Weight — 20 lbs. 010 the Stated holding power of the fence is 450 kJ.Bus speed — 70 km/h Weight — 20 lbs. 010 the Stated holding power of the fence is 450 kJ.
Sight, I tell you, not for the faint of heart when three-axle bus MAZ loaded with ballast up to 20 tons at a speed of about 70 km/h crashes into the barrier. Why such speed? It is sufficient to confirm the calculated holding capacity of the test fence under the condition of permissible dynamic deflection and 0.7 meters. Created it in the Ulyanovsk KTTS “Metallokonstruktsiya” where they developed and produce over 80% of all road barriers in the country. In the Arsenal of 43 species of restraint of road barriers and the same for installation on bridges and overpasses. Maximum holding capacity of some structures reaches up to 725 kJ. This is more than required by our standards, because fencing supply in other countries, where regulations often are harsher in Belarus, Kazakhstan, Poland, Iran and others. If the machinery we have not yet succeeded in protecting them from something that we understand and can do.
|Alexander I. Shcherbina, Deputy Director of the weaving workshop “Metallokonstruktsiya”Alexander I. Shcherbina, Deputy Director of the weaving workshop “Metallokonstruktsiya”
Each test costs about one million rubles. The crash test results help to detect weaknesses in design. This time the fence has withstood the impact: we are satisfied with the results, modifications are required. In designing this barrier applied computer simulation: virtual crash tests allow you to make the most important changes in the design at the stage design. Real crash-test only confirmed our calculations.
Crash test of guardrails (VIDEO)Crash test of guardrails (VIDEO)Photo: Yakubov Konstantin , Cages George