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Continuing Professional Development Door systems and accessibility


Specifying an automatic door system depends on the volume of traffi c, environmental conditions, whether use is continuous or intermittent and whether the door is designated as an emergency exit


Access all areas


As part of the government’s £370m Access for All scheme to make UK railway stations easier to use, a £14.5m step-free entrance building was built at London’s Clapham Junction. Delivering smooth operation and closing reliability in all weathers and seasons, Dorma’s ED 100 swing door operators were chosen for the building’s automatic doors. Thousands of passengers use the


station every day and it is Europe’s busiest in terms of the number of trains passing through each year. Delivered by Network Rail with main contractor Osborne, the improvement package made the station fully accessible for all passengers. Even in tough conditions, such as


strong winds and extreme cold temperatures, the ED 100/250 swing door operators from Dorma perform extremely well. Their opening and closing behaviour responds fl exibly to the prevailing conditions, helping to avoid heat loss and contributing to the reduction of the building’s overall carbon footprint.


During in-house testing at


temperatures of –15°C the ED 100 improved closing speeds by up to 50% compared with Dorma’s previous model of electro-hydraulic operator, the ED 200. Also, its integrated Initial Drive Control (IDC) ensures functional stability, as the system detects and compensates for even the slightest irregularities in the door’s performance. The ED 100 swing door operator is also equipped with Dorma Wind-Load Control. When adjusted to automatic mode, the system recognises and compensates for wind loads with a force of up to 150N (the maximum admissible force) making it the perfect solution for doors subjected to high winds and extreme temperatures. Suitable for internal and external


doors, both single and double leaf, the ED 100/250 swing door operators are designed as part of Dorma’s Contur range. ED 100 operators offer a contemporary, unobtrusive and compact design suited to all environments and interior designs. As part of the major improvement


works, Osborne completed construction and delivery of new ticketing facilities, travel information screens and toilets in a fully-refurbished ticket hall, helping to make the station more accessible, brighter and easier to negotiate. For the entrance to the new lift


lobby at Platform 17, which provides access to a number of platforms, Dorma supplied the ES 200 sliding automatic door operator.


Automatic doors by Dorma were used for the refurbished step-free entrance at Clapham Junction station.


38 | JANUARY 2015 | CONSTRUCTION MANAGER


> number of internal manual doors. Dorma offers manual door controls that also ensure compliance. There are two main considerations in specifying door controls: does it meet the requirements of the Approved Document M and BS 8300, and, if applied to a fi re door, does it satisfy the fi re regulations? In a commercial building, to meet the


requirements of Approved Document M and the BS 8300, a door closer must “produce an opening force of below 30N between 0˚ and 30˚ and below 22.5N between 30˚ and 60˚”. On a fi re door this must be achieved at minimum spring strength of EN3. BS 8300 and Approved Document M


state the maximum opening forces in respect of the door closer, but the complete doorset must be compliant with this opening force. Additional items of door ironmongery may also contribute to the opening resistance of the doorset. Therefore care should be taken when selecting hinges, intumescent seals and latches to keep the resistance added to the doorset to a minimum.


Types of door controls There are two types of door controls: traditional “rack and pinion” closers with scissor arms, and “cam action” closers with slide arms. The latter is designed so that it provides the required maximum closing force within the fi nal few degrees, and yet the opening force falls away even more rapidly than the scissor-armed rack and pinion. After the fi rst few degrees, there is little resistance throughout the opening cycle, thus helping to ensure doorsets can meet the requirements of Part M and BS 8300. As well as the closer, there are many


other elements of a manual door design that can affect accessibility. Good quality hinges will ensure closing forces can be kept to a minimum. Locks can provide a high degree of resistance over the fi nal few degrees of closing. A silent pattern latch bolt offers little resistance when engaging into the strike plate, helping to keep closing forces to a minimum. To ensure that people with impaired vision or manual dexterity problems can use the keyway — which guides the key into the lock — the cylinder should


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