Giant shields and the fight against water: interesting facts about the construction of BCL

October 10
Transport

Moscow is preparing for the simultaneous launch of 10 metro stations. There has never been such a thing in the history of the metropolitan subway. By the end of 2021, passengers will be accepted at once on three sections of the Big Circle Line (BCL) — western, south-western and southern. Their total length is about 20 kilometers. The following stations are located on it: Terekhovo, Kuntsevskaya, Davydkovo, Aminevskaya, Michurinsky Prospekt, Prospekt Vernadskogo, Novatorskaya, Vorontsovskaya, Zyuzino, Kahovskaya.

The first section of the BCL was launched in the winter of 2018, and today 12 stations, or a third of the entire ring, are open to passengers. It is planned to completely close the big ring at the end of 2022.

In expectation of a large-scale launch, we tell you about interesting facts, figures, records related to the Big Circle Line, as well as about some unique construction technologies.

Fast and convenient

The Big Circle Line is the largest project in the entire history of metro construction in Moscow. The line will stretch 70 kilometers in length, connecting the districts, the radial directions of the metro and the railway. There will be a total of 31 stations on the BCL. 19 of them will become interchange stations to other subway lines, the Moscow Central Circle or commuter trains. Trips around Moscow will be even more convenient, and residents and guests of the capital will be able to save time and money.

After launching movement on all sections, the Big Circle Line will become the longest metro circle in the world, surpassing the current record holder-the second circle line of the Beijing subway-by 13 kilometers.

Working day and night

More than 15 thousand people are involved in the BCL construction. More than 70 percent — for the stations construction, which will be launched this year on the western, south-western and southern sections. The work is carried out around the clock in three shifts.

Giant Shields

Tunneling at the BCL is 97 percent completed. The shields continue to work on the eastern section of the circle. It is also necessary to complete the construction of connecting branches in the Zamoskvoretskoye and Aminyevskoye electric depot, which will serve the BCL trains.

The circle tunneling is carried out both with traditional six-meter shields and 10-meter giant shields. They help to build sections of two-lane tunnels.

By the way, in 2020, Moscow set a world record for the number of operating tunnel-boring complexes — the capital's subway was simultaneously built by 23 huge machines. Another last year’s achievement — in just 35 days, the Pobeda shield was assembled, which is tunneling on the BCL eastern section.

While driving two-lane tunnel on the BCL western section, the crew of the Lilia tunneling complex set a record for the speed of work — 500 linear meters per month.

Fight against quicksand

In Moscow, the underground tunneling is complicated by difficult hydrogeological conditions. In other words, the capital's soil contains too much water, which accumulates in the voids of karst rocks. A lot of liquid is also retained by loamy and sandy areas. However, the most unpleasant enemy of tunneling men are considered quicksand — bulk masses of fine dusty sand mixed with clay and soaked with water like a sponge. To fight against quicksand, the BCL complex areas were frozen with liquid nitrogen or special refrigeration units. In addition, the subway tunnelers used equipment to reduce the water level.

Press Service of the Mayor and Moscow Government

Accurate calculation

The BCL construction takes place in restrained urban conditions, so a large number of underground utilities is not uncommon. In this difficult situation, a special underground monitoring system came to help the builders. It is based on accurate calculations of how construction work can affect the surrounding buildings. After evaluating all the variants, the experts decided where and how to reinforce the foundations of the structures that are located above the metro tunnels being constructed.

Digital architecture

Modern technologies were also used for the Terekhovo and Kuntsevskaya stations design. With the help of the BIM (Building Information Modeling) information modeling, specialists have developed the laying of engineering systems routes, performed the equipment arrangement linking it completely together. This approach made it possible to avoid design errors and reduced the construction time of the stations by several months.

Thousands of kilometers of cables

One of the serious tasks for metro builders is the installation of a large amount of equipment that is needed to ensure safety, train traffic, escalators control, energy management and other services. In 2021, about 55 engineering systems have been installed at each new station being commissioned on the BCL. This is approximately 208 thousand pieces of equipment.

In addition, more than 223 thousand meters of pipeline, more than 61 thousand meters of air ducts and six thousand kilometers of cable have been laid at the west, south-west and south stations of BCL.

Light, color and air

The BCL southern section is the first section of the Moscow Metro, in the decoration of the stations of which artificial stone (quartz agglomerate) was used. It is similar in hardness to granite, does not absorb moisture and gives scope to imagination when using a color that cannot be found in nature. In addition, a bright stone improves navigation. At the Vorontsovskaya station, a bright orange color accent will tell passengers where to change to the Kaluzhsko-Rizhskoye metro line.

And when finishing the station "Terekhovo" of the western section, an innovative material was used - glass fiber concrete, due to which a space full of light and air was created. There are no analogues of glass fiber reinforced concrete in the design of metro stations in the world today. In Russia, this material was first used to create curved forms of the facade of the ice cave in the Zaryadye Park.

Many meters under the ground

The four longest escalators in the Moscow metro will operate at the Maryina Roscha station. Each length of them is 130 meters and 724 steps. Escalators will lower passengers to a depth of 64.5 meters.

Now the longest escalator in the capital is located at the Park Pobedy station, its length is 127 meters.

Source: mos.ru

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