Fire doors from Tianming help to secure Beijing Subway

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Tianming has developed two new types of pressure-resistant fire doors for Beijing Subway’s tunnels after an accident last year revealed that the old fire doors were not up to the job.

In June 2011 an accident caused by a steel fire door that had fallen off its hinges in the Beijing Subway tunnels drew the attention of the Chinese government. The government ordered the Beijing Fire Protection Bureau to organize a committee, in which ASSA ABLOY Group company Tianming was included, to investigate the issue and advise the authorities on an appropriate course of action.

Tianming and the committee concluded that the steel fire doors installed in the subway tunnels were not up to the job. The combination of intense pressure differences and the humid environment underground was causing the steel fire doors to deform and fall off their hinges, posing significant safety risks.

“We concluded that we needed to devise a new product that is pressure-resistant, fire-resistant, rust-resistant and easy to install securely,” says Sun Chao, general manager of Tianming.

From a list of initial proposals, Tianming ultimately developed two different pressure-resistant fire doors: a single swing door equipped with a three-point push-bar-lock and a double swing door that meets the requirements for two-way evacuations during emergencies. Fellow ASSA ABLOY Group company Guli contributed to the development of the two-way push-bar lock and both door products were successfully completed.

Thanks to the efforts of the technical department, the first sample door was produced by the end of 2011. On average, two pressure-proof fire doors are needed for every 600 meters of subway tunnel. In Beijing alone, there is a total of 400km of subway tunnels. This should translate into demand for nearly 1,400 pressure-proof fire doors.