Bet on tilt

Escalators have begun to be installed in one of the future lobbies of the Aviamotornaya Big Circle Line. The correspondent found out what is special about the installation of lifting machines by a new company for Mosmetrostroy.

The pit on site No. 26, where Aviamotornaya is being built, stretches for a quarter of a kilometer. It is divided along its length into seven sections. In the sixth, located on the side of Entuziastov Highway, the first – southern – underground lobby is being built. An inclined passage with a height of 13.5 meters is ready here. Since the end of June, the fifth section of SMU-24 has been installing escalators on it.

NEW MACHINES ARE EASIER TO INSTALL

– There will be three escalators from ThyssenKrupp. This is our first time installing these, but they are even easier to install. Usually we join many small fragments together. These escalators arrived divided into three long parts each,” says site mining foreman Evgeniy Prosyannikov. – We accepted the slope and in the first week of work completed the rigging of six sections.

Before loading the lifting machines onto the slope, SMU-24 employees prepared it. Bridges were made from channels - U-shaped steel profiles - on a concrete foundation. They formed special roads on which escalators are laid. We installed winches and hung hoists from the ceiling - special blocks through which the cables were passed. Then we started rigging work.

The control cabinets and spare engines are to be lowered into the engine room at an angle. After rigging, sections, guides and chains are joined. Next, the escalators will be aligned in height and center lines. The next stage will be the installation of cornices, balustrades and handrails.

The third section of SMU-6 is responsible for monolithic work in the sixth section of the pit. Since mid-November 2018, his crews have been building the underground lobby around the clock. They began preparing the concrete foundation for the installation of escalators and the machine room at the end of April 2019.

Station pit and inclined passage on the square. No. 26 (to the left of the railway tracks) and site No. 27 (to the right)

PREPARING THE TRANSFER

At the same site, next to the fifth and fourth sections of the pit, SMU-1 is excavating a 72-meter inclined passage. It will connect Aviamotornaya via an interchange with the Kalininskaya line station of the same name, which lies 30 meters lower.

180 employees are working on its construction around the clock. All 26 temporary cast iron lining rings have already been installed, which will then be dismantled. We started installing permanent ones. According to the project, there will be 95 of them.

Having completed the tunneling work, they will begin waterproofing work. The slope awaits rebolting, control injection and chasing, construction of internal structures. Then it will be given to SMU-24 for the installation of four escalators from the St. Petersburg company Es-Service.

PROTECTION FOR UNDERGROUND PASSAGE

Another exit from the station will lead to Aviamotornaya Street. For now, here is site No. 27, where they are preparing a foundation pit for the future second vestibule. It will be connected to the station by a long underground corridor that will pass under the Moscow Railway. The complex geology of the site and the proximity of existing tracks forced metro builders to look for non-standard solutions.

– The soil in this place is represented by quicksand - it cannot be developed without securing it. Therefore, we decided to create a protective screen from pipes. This will eliminate any negative impact and subsidence of railway tracks, explained Deputy Chief Engineer of SMU-1 Evgeniy Mamonov.

Mining foreman of the fifth section of SMU-24 Evgeniy Prosyannikov against the backdrop of the inclined course of vestibule No. 1

It took a year to install 26 pipes at SMU-1. Each of them is more than a meter in diameter and 75 meters in length. The excavation was carried out with two AVN-800 microshields. They started from site No. 27 and entered a special caisson on the 26th.

The transition itself will begin to be built when the horizontal jet is completed. The rock will be mined, shipped and lining elements installed using the ITC-312 mining machine.

BY THE WAY

At the beginning of August, the Herrenknecht S-290 “Valeria” tunnel-boring complex built the left running tunnel from the ramp chamber at site No. 25.3 to Aviamotornaya. The excavation was carried out by section No. 3 of Evgeniy Bibikova from Tunnel-2001. Now both tunnels between the Nizhegorodskaya and Aviamotornaya launch stations are ready.