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During World War I, Sir Ernest William Moir produced a design for concrete machine-gun pillboxes [5] constructed from a system of interlocking precast concrete blocks, with a steel roof. Around 1,500 Moir pillboxes were eventually produced (with blocks cast at Richborough in Kent) and sent to the Western Front in 1918.
There were three embrasures suitable for rifles or light machine guns and a small entrance like a low window. This design was made from reinforced concrete shuttered by corrugated iron; this gave the design the popular name Armco after the manufacturer of corrugated iron of that name. [29] [30] [31] The type 25 is rare: about 30 are recorded as ...
During World War I and World War II, many types of blockhouses were built, when time allowed usually constructed of reinforced concrete. The major difference between a modern blockhouse and a bunker is that a bunker is constructed mostly below ground level while a blockhouse is constructed mostly above ground level. [14]
Smaller cylinders cast from concrete are also frequently found. [83] [84] Pimples, popularly known as Dragon's teeth, were pyramid-shaped concrete blocks designed specifically to counter tanks which, attempting to pass them, would climb up exposing vulnerable parts of the vehicle and possibly slip down with the tracks between the points. They ...
This type of bunker is a small concrete structure, partly dug into the ground, which is usually a part of a trench system. Such bunkers give the defending soldiers better protection than the open trench and also include top protection against aerial attack. They also provide shelter against the weather.
Mr Putin had a huge underground bunker built beneath Gelendzhik Palace, according to plans posted online by the engineering firm in charge of the project, with a network of tunnels lying around 50 ...
According to plans, the bunker would be made up of 12 arches stretching east to west in a barrel vault 400 meters long and 85 meters wide. The arches would have an internal height of 32.2 m, of which 19.2 m was under the ground level. Their thickness reached 3 meters, and would have eventually reached 5 meters through a further concrete pour. [20]
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