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CMRL recently made a historic breakthrough in underground metro rail construction by drilling under the riverbed of Adyar
this breakthrough is part of corridor 3 that runs from madhavaram in the north to sipcot in the south and has to cut through adyar river
both stations adjoining the river greenways in the north and adyar juction in the south have been planned as underground
this means that not one but two tunnel boring machines Kaveri and Adyar will have to drill under the river to create two railtracks north to south
now I'll quickly show you the stretch.in reality. this is the total distance of 1.2 km needed to be covered to build a tunnel between Greenways Road and Adyar Junction, which includes a 400-mtrs. stretch underneath the Adyar and Thiru. Vi. Ka. Bridge
let's model this 1.2km through animation that you can see here
here is the thiru vi ka bridge that completely sits above adyar river
the riverbed varies in depth between 3 and 5ms below ground, so i'm showing you the deepest part
at two ends would be constructed the greenways station and the adyar station
connecting these two
The purple track will be placed approximately 18 metres below the surface
In February 2023, ‘Kaveri’ TBM was launched at Greenways Road Metro and started tunnelling towards Adyar Junction
by now, ‘Kaveri’ has tunnelled a distance of 583 mtrs. and has reached the Adyar riverbed
It is expected that ‘Kaveri’ will finish tunnelling in three months.
The other TBM ‘Adyar’ has covered 250 mtrs so far
like i've always done in my previous epsidoes, let's stack adyar tunnel against a historic engineering marvel, the tames tunnel in london
is a tunnel beneath the River Thames in London, connecting Rotherhithe and Wapping
is (400 m) long and running at a depth of 23 m below the river surface
It was built between 1825 and 1843
originally designed for horse-drawn carriages, but was mainly used by pedestrians and became a tourist attraction. In 1869 it was converted into a railway tunnel for use by the East London line which, since 2010, is part of the London Overground railway network
built using the tunnelling shield newly invented in the early 19th century