TMMOB, The cause of catastrophes

Union of Chambers of Turkish Engineers and Architects (TMMOB) Chamber of Civil Engineers made a press release about the train accident that occurred in Tekirdağ and killed 24 and injured 318.

"The cause of disasters is not natural phenomena, but the delivery of engineering knowledge and experience to daily trade!" "The dynamic effects of the locomotive and the first wagon of the train while passing over the culvert loosened the ground under the rails, and it is understood that this situation caused the rails to collapse extremely." While the passage of other wagons continued, the infill floor completely slipped under the rails, and the wagons were derailed and overturned as the rails collapsed further. " gave his statements.

This event, the railway lines, the inspection and maintenance of the regular show that shows the importance of the Chamber of Civil Engineers, Criminals, not the rain, the builders, the builders and those who did not inspect the structures emphasized.

The statement, construction permits, engineers and architects have been removed from the signatures of the painful consequences of the future was underlined that the pain.

The full statement of the Chamber of Civil Engineers is as follows:

“THE CAUSES OF DISASTERS ARE NOT NATURAL EVENTS, DELIVERY OF ENGINEERING KNOWLEDGE AND KNOWLEDGE TO DAILY TRADE! ENGINEERING AND ENGINEERS ARE NO COUNTING!

Uzunköprü-Halkalı 12703 passenger train between 8 on July 2018 derailed in the Sarılar region of Tekirdağ province. The rear five-car wagon, consisting of a locomotive and six wagons, is derailed and derailed. The wagons of the passenger train were derailed and dragged during a passage through a grille. As a result of the accident, 24 has lost their lives and 318 has been injured.

Since the railway line cuts the stream bed, an orifice was built in this section to ensure the flow of the stream. The upper part of this culvert has been filled and the railway line has been crossed. According to the initial determinations, the passenger train was derailed due to the emptying of the fill floor between the culvert and the railway line.

The railway superstructure and infrastructure designed as a carrier system are exposed to dynamic effects during the passage of vehicles. The maintenance conditions of the railway structure and the speed of the train determine the magnitude of the dynamic effects: neglect of the structure and the high speed of the train increase the dynamic effects. The increase in dynamic effects (loads) causes the railway superstructure and infrastructure to be extremely stressed. Overstretching the railway structure creates collapses in the rails beyond the permitted limits, which can lead to derailment of the train.

Regular inspection of railway inspection and maintenance

“In the incident that took place in Tekirdağ, the dynamic effects created by the locomotive and the first wagon of the train while passing over the culvert loosened the ground under the rails, and it is understood that this situation caused the rails to collapse excessively. While the passage of other wagons continued, the infill floor completely slipped under the rails, and the wagons were derailed and overturned as the rails collapsed more.

It is highly likely that the ground between the top of the vent and the rails is loose due to rainfall occurring recently and on the day of the event. Thus, the carrying power of the ground in this section is weakened and migrated with the dynamic effects that the train was subjected to during the passage of the train. It is understood that this weakening in the ground did not appear suddenly, and that the precipitation and other negative factors emerged with the cumulative effect.

This event has once again demonstrated the importance of regular inspection and maintenance of railway lines.

The authorities, as they do after each disaster, forget the essence of the subject and decide on the result! The consequences of the disasters that occur after each disaster are not emphasized. The cause-effect relationship is not taken into account!

It is seen that the railway line passes through the farmland. In areas where agricultural lands pass, the carrying capacity of the ground is weak. In the photos taken, it is seen that due to the inadequacy of the ballast and lower ballast layers, it loses its function and even disappears within the natural ground. Technically, this is called stop ballast ingestion.

Conventional railway superstructure; It consists of rail, traverse, connecting material and ballast layer. The railway infrastructure consists of sub-ballast, soil, body and natural ground. The ballast layer serves as the elastic bearing of the railway line. The lower ballast layer acts as a filter layer which prevents the penetration of fine-grained soils into the ballast layer due to the effect of water. The size of the natural ground or the rail line will be passed through; taking into account the climatic conditions and the condition of the land, the necessary reinforcement is required.

As a result; According to the first determinations there is a serious negligence. During the construction of the railway line, information related to collapsing, collapsing and sheet slippage and discharge was not taken into account. We also want to know that the necessary maintenance and controls are not made considering the rains, and that this accident should not be connected only to the last rains! ”

Those who are guilty, who do it, do not inspect the buildings

“The culprit is not rain! Those who do, and those who do not supervise the buildings built.

We think that permanent deformations in the railway superstructure, in other words, collapses and the wagons coming from the rear lose their rail-wheel contact due to the moving loads of the locomotive and the wagon in the rear, and we think that the other wagons are overturned!

Furthermore, we would like to draw the painful consequences of the removal of the signatures of engineers and architects from the building permits, and the fact that we will experience the future with this accident once again!

As the Chamber of Civil Engineers, we wish our condolences to the relatives of our citizens who lost their lives and a speedy recovery to those injured. "

TMMOB Chamber of Civil Engineers
Board Of Directors