Page 19 - Contractors World - International Vol 3 No 7

on an earlier date. The preparation work at that
construction site will start this month.
Tunne l l i ng f rom Zhu l eb i no S t a t i on to
Lermontovsky Prospekt Station is already
underway. All new stations of the Taganskaya
-
Krasnopresnenskaya Line are not located deep
underground (the average depth is of 12 to 13
m) and being constructed using cut and cover
techniques.
About 900 persons are employed now on
five construction sites with the work carried out
around the clock.
The extension of the subway line and the
provision of transfer facilities at stations will ease up
the transportation situation in Zhulebino area and
relieve the load in Vykhino area, while improving the
environmental conditions around Novoryazanskoe
Highway and Moscow Beltway.
A Lovat RME-242SE Tunnel Boring Machine (now
part of Caterpillar) named “Olga” is used for shield
tunnelling. The 330 ton TBM has a cutting diameter of
6.164
m and is 85 m long, will drive the long left-hand
side tunnel at a rate of 280 m per month.
The tunnel boring machine was assembled
in a launch pit at the Zhulebino Subway Station
construction site during March.
This is the first of four tunnel boring machines
that will be used in this section.
September progress report
After the scheduled shakedown operations were
completed, the trial tunnelling was started. The
tunnel boring machine will have to travel 1,800 m
before arriving at Vykhino station.
This machine is 82 m long, weighs 508 metric
tons and has the cutting diameter of 6.15 m. The
tunnelling system has a tunnel liner installation
unit, which allows the reinforced concrete liner to
be installed simultaneously with the tunnelling.
The prefabricated liner blocks are 0.5 m thick and
1.4
m long.
The work started in August 2011 and is to be
completed in September 2013.
The left hand tunnel in Lermontovsky Prospekt
-
Vykhino Section has been driven by more than
halfway.
In the other direction (Vykhino - Lermontovsky
Prospekt) with a total tunnel length of 1,777.4 meter
long a Herrenknecht-736 Tunneling System had driven
1,010
m of tunnel by early September.
Permanent lining installation is carried out
simultaneously; the contractors install an average of
JCB tracked excavators and backhoe loaders, Hitachi
excavators make up part of the vast fleet of equipment and
personnel working on the Moscow metro system preparing
the launch pits for the Lovat tunnel boring machines
Contractors World - InternationaVol 3 No 7