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Tunnel construction
Строительство тоннеля
Presented by
Münze Österreich AG – Austrian Mint
Nominal value
25 euro
Weight
16,50 g
Diameter
34,00 mm
Metal
Silver-Niobium
Mintage
65000 pcs.
Production quality
Special uncirculated
Designer
Herbert Wähner
Producer
Münze Österreich AG – Austrian Mint
Description of obverse and reverse
The obverse of the coin a present-day tunnel boring machine is depicted on the ice-blue niobium core. Its rotating motion is symbolized by the three arrows, which go up and around, from right to left – the outer edge of the tunneling bore. The twinned set of three straight lines, located in the top part of this design field, is a schematic representation of the air access tunnels that must be part of a tunnel’s overall design. The obverse’s outer silver ring shows the mountains through which the machine pierces. Also located on this side of the coin is the country of issue, «Republik Oesterreich», Republic of Austria, the face value of 25 euros and the year of issue 2013. The coin’s reverse makes excellent use of the niobium core to depict a twinned road tunnel entrance, similar to the many that dot the Austrian and Alpine landscapes. In the silver ring there is a depiction of a tunnel worker, wearing working clothes that were common in the late 19th and early 20th centuries, using a pneumatic drill to loosen rock. The word «Tunnelbau» (tunnel construction) is located in the lower portion of the outer silver ring. Both sides of the coin were designed and engraved by Mint engraver Mr. Herbert Waehner.
A brief annotation
The «New Austrian Tunneling Method», (or NATM) which began in 1957. Engineers now continuously monitor the rock masses as the boring machine passes through the various masses of rocks. Depending on how the rock masses react as the tunnel is being created, adjustments will be made to the drilling so that that stress and load factor of the rock masses become part of the finished engineered design. Thereby using strength of the surrounding rock to reinforce the tunnel, and complemented by the supports added to hold up areas of the rock load.
New issue
№ 2 (59) 2022
№ 2 (59) 2022
Новости партнеров
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