Elementary Introduction to Security Glass System Used in Rail Transit

1. Foreword HC Security Network As an urban transportation hub, the underground rail transportation system has a series of superior features such as strong transportation capacity, large passenger flow, on-time operation, fast operation speed, low freight, no pollution, etc. Beijing, Shanghai, and Guangzhou have successively invested in and constructed a number of underground railways, in particular the Shanghai Underground Railway, which has grown to 13 lines, forming an all-encompassing, criss-crossing underground traffic network with an annual passenger flow of 1 billion people. The citizens have provided convenience and greatly eased the pressure on the city's ground transportation.

The reason why the underground rail transit system has so many advantages is that it is underground and its operation is generally undisturbed and affected. Because of its deep underground, people exchange places must also be built deep underground, it is this kind of building depth. People underground, in the event of an unexpected crisis, will bring serious threats to the safety of passengers, resulting in group bodied injuries and serious economic losses, the degree of disaster will be far greater than the ground, due to disaster can not be completely avoided, especially terror Attacks are highly concealed. The time and form of their attacks are difficult to estimate. Therefore, effective measures must be taken to reduce the damage caused by disasters.

2. Disasters of Underground Rail Transit System 2.1 Main Disaster Types of Underground Rail Transit System Looking at the disasters of underground rail transit systems that have occurred one after another in recent years in the world, whether it is man-made or accidental disasters, there are mainly the following types:

(1) Fire: Fire prevention is very important for the construction and management of underground rail transit. Fire can be said to be the main disaster for underground rail transit. Because of its destructive power and damage, it can cause many fire hazards. ;

(2) Explosion: The explosion of underground rail transit is an incident that has occurred frequently in recent years. It is mainly caused by terrorist attacks and is basically man-made disasters.

(3) Biological or chemical attack: Biological or chemical weapons have the characteristics of concealment and deception, and they are easy to evade detection. Their spread in the air is fast and their infectivity is strong. Once this type of attack occurs in the subway, it is very Can easily cause a large area of ​​infection.

Regardless of man-made or accidental fire disasters, explosion disasters or biological assaults, the underground traffic system with high concentration of people and high concentration of people flows. Once a disaster occurs, the resulting casualties are very large, from 1987 in London. Subway fires In 2003, Daegu subway fire in South Korea, from the explosion of the Moscow subway in 2004 to the West Metro detonation in 2005, and Sarin gas in Tokyo subway in Japan in 1985, proved the great destruction of the underground rail transit system. force.

2.2 The disaster characteristics of the underground rail transit system are different from those of the ground construction. The supporting facilities of the underground rail transit system are located underground. Therefore, the disaster has its own characteristics. The main manifestations are:

(1) The space of people flow is small and relatively sealed. In the event of a fire, the heat easily accumulates, and the ambient temperature rises quickly. Because of space confinement, the flame is not fully burned, and the amount of smoke is high and the smoke is difficult to remove, which seriously affects the escape of people; In the event of an explosion, the space is small, and the blast shock wave has a large impact;

(2) Difficulty in Escape: The pedestrian exchange site of the underground rail transit system is underground, and the escape passage is narrow, and the evacuation distance is long, which is not conducive to escape, and the density of people is high. When a panic occurs, it is easy to cause a stampede accident. On the other hand, the escape of people is caused by Bottom up, it also brings more difficulty to escape;

(3) Difficulty in rescue: As the building is deep underground and subject to space constraints, when disasters occur, rescue workers can hardly come to the scene to carry out rescue work immediately. In particular, in the event of a fire, the rescue work is more likely to be restricted by external environmental conditions.