Tunnelbuilder Promoting the world's tunnelling industry to a huge qualified audience

View the Spanish Tunnelbuilder website View the Italian Tunnelbuilder website

Archive Search


Colombia, Caldas - co/12

La Miel Hydro

In the mountains of central-west comprising machine hall 87 m-long, 19.5 m-wide with 598 m2 face, powerhouse 52 m-long, 15.2 m-wide with 691 m2 face, transformer room 87 m-long with 130 m2 face, deviation tnnel 550 m-long, 11 m-wide with 109 m2 face and outlet tunnel 4.2 km-long, 9 m-wide with 72 m2 face. Most tunnel surfaces are secured using wet thin stream shotcrete applied with Aliva equipment mounted on Dieci chassis using a mix comprising 420 kg cement, 830 kg sand, 1 t gravel (12 mm) and 202 litres of water. Sept 1999.