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A folding door is a type of door which opens by folding back in sections or so-called panels. Folding doors are also known as 'bi-fold doors', in spite of them most often having more than two panels. Another term is 'concertina' doors, inspired by the musical instrument of the same name.
The gangway was of concertina pattern, and was pressed against the corresponding gangway on the leading coach by means of sprung pistons. [ 20 ] Although a normal gangway connection was used, the passageway through the tender was only 5 feet (1.52 m) high and 18 inches (0.46 m) wide, and the floor of the passage was 2 feet (0.61 m) above the ...
Concertina wire or Dannert wire [1] is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina.
The effectiveness of any wire obstacle is greatly increased by planting anti-tank and blast antipersonnel mines in and around it. Additionally, connecting bounding anti-personnel mines (e.g. the PROM-1) to the obstacle with tripwires has the effect of booby-trapping the obstacle itself, hindering attempts to clear it.
Entrance to HM Prison Edinburgh. A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.
Some parts of the defensive line were manned and equipped with the bunkers, outposts, reinforcing and fire support bases, surrounded by concertina wire. Other segments were under constant radar, motion and acoustic surveillance, and secured by trip wires, mine fields, and barbed-wire entanglements.
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Assembling the HESCO unit entails unfolding it and filling it with sand, soil or gravel, usually using a front end loader.The placement of the barrier is generally very similar to the placement of a sandbag barrier or earth berm except that room must generally be allowed for the equipment used to fill the barrier.
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