Get Rid of Bolt Loosing - Let Metro "Zero Accident" Work

On the morning of July 5th, at the Beijing Metro Line 4 Zoo Station, the elevator was reversed due to sudden equipment failure. Some passengers who were taking the elevator fell down, killing 1 person and injuring 30 others. The Beijing Municipal Bureau of Quality Supervision announced preliminary investigation results. The direct cause of the accident was "due to the damage of fixed parts, the escalator drives the main engine to displace, causing the drive chain to fall off and the escalator to slide."

This incident is a natural reminder of the accident on December 14, last year, Shenzhen Metro International Trade Station. The elevator was also retrograde, causing 25 passengers to be injured. The cause of the accident announced at that time was almost the same as the cause of the accident in Beijing. “The main shaft of the escalator has been loosened. One of the escalators has been cut off, causing the main support to displace, causing the drive chain to disengage from the sprocket, and the escalator on the escalator. Under the influence of the decline." Even more shocking is that the two accidents of elevators from the same brand Otis.

After the accident happened in Shenzhen Metro's December 12th accident, many people thought of the safety of the Beijing subway as a whole and gave many suggestions. These suggestions include the use of elevators, walking ladders, the handling of emergencies, the level of service of the staff, and the sanitary status of the toilets, especially the orderly management of the morning and evening travel peak hours, and the fact that platforms on some lines do not have security screen doors. , are hidden dangers of accidents. Unfortunately, these suggestions still failed to avoid this tragedy.

In addition, Beijing's subway construction is in a stage of rapid speeding. There are more new lines and there may be more security risks. This accident is also a reminder. Safety management must keep up with the leap-forward development of the subway.

Last night, the Beijing Municipal Bureau of Quality Supervision issued an emergency notice requesting immediate safety inspections of escalators and moving walkways within the city to investigate hidden dangers. This is of course necessary, but the relevant departments need to thoroughly investigate the responsibilities of the management of the Metro Line 4 and Otis Elevator Manufacturers, and strictly pursue the matter in accordance with the law.

Regarding such a brand with frequent accidents, whether the relevant departments have given enough attention and fulfilled their supervisory duties. Only half a year after the retrograde tragedy of the Shenzhen Metro took place, the Beijing subway still suffered such an incident. It is also not surprising that the operating department has learned a lesson.

In addition, on the day before the accident, the cable on the side of the tunnel from Anheqiao North Station to Beigongmen Station of Line 4 of Beijing Subway suddenly fell off, causing a power outage on the section track, and the section could not pass through normally.

The crowded condition of Beijing subways is well-known. High utilization rate will inevitably bring about high failure rate. The security check of passengers and the normal maintenance of supporting service facilities are difficult for passengers to know, not to mention the need for supervision. This requires the subway operation department to check the security of possession. Each corner and detail of the hidden danger minimizes the chance of accidents.

Of course, the “zero accidents” that require the delivery of millions of passengers a day are harsh, but how to move closer to “zero accidents” is what the subway operation department should do its best to do.

All these examples show that as the role of the subway in city traffic becomes more and more important, the subway operation department and the security authority should also upgrade their security concepts so that they can be matched with high-use subways.

Architectural Tension Bar For Construction

High Strength Steel Tie Rod are steel structural members made of carbon structural steel and alloy steel, processed by machining, heat treatment and surface anti-corrosion treatment, supplemented by adjusting sleeves, lock and joints etc. The steel tie rod are important components of steel structures for construction of giant, large span buildings and ship docks. They are mainly used for prestressed parts and large span buildings in construction projects. While the strength of the product is improved, but the plasticity index is not reduced, which satisfies the principle of using the same amount of strength in the architectural design. The tie rods, tie bars, tension rods and tension bars steel grades are specified as grade 460, grade 520, grade 550, grade 650.

Tension Bar,High Tensile Steel Rod,Structural Tension Rods,Architectural Tension Bar For Construction