Washout

The author writes tankizt

In St. Petersburg metro has no place, so shrouded in mystery and myths as the stage Forest-Pl.Muzhestva, referred to as "erosion." Its history begins on the date of construction, when in 1969 for the sake of reducing the time to catch the beginning of the XXV Congress of the Communist Party, decided to hold a trace of tunnels straight through the channel of an underground river course were initially bypass options, but they were all rejected. In 1974, the first major accident occurred in the area on April 8, at the advanced drilling exploratory wells in the lower tunnel was discovered unfrozen rock from which the water comes. Slaughter began to fill with water and sand. As a result, built tunnels were flooded.
On the surface, over the site of the accident, formed dips, cracked walls of the houses. After stopping the promotion of quicksand, by backfilling the tunnels, they pumped tap water to prevent the movement of soil and the subsequent destruction of the surface. About the events in 1986 was to make a movie break.
Re-excavation was carried out by deep freezing ground for safety tunnel wall made of three-layer steel-concrete-iron. And to reduce the cost and accelerate the construction of tunnels placed one above the other. December 31, 1975 plot put into operation.

23 photos





During the operation in tunnels constantly receives water that is removed by standard equipment. So far in 1994, the flow of water is not greatly increased and tunnels have not started to sink. In 1995, limited the speed of trains, tunnels entered prevention: a kind of process window on weekends and evenings after 22, when the traffic on the site stopped. However, all efforts have been in vain, the water supply and stop the drawdown of tunnels failed. It was decided to close the emergency tunnels and flooding that occurred on the night of 5th to 6th December 1995, with both ends of the multimeter built concrete plugs. The northern section was cut off from the main part of the branches and there organized a shuttle train trains. For Forest restored through a Congress that wraps compositions. His small photo report, I'll start with that.



Congress after putting into operation the site was dismantled.



Plot bulkheads old and new tunnels. Right ventsboyka tunnel with the second path.



Just a few meters away is a passage in the old tunnels. Lower the old tunnels. Bottle - a kind of mixer, erected, apparently, the metro workers.



Way then dismantled, instead of a single narrow-gauge railway wagons. Hello nwd_megavolt



Move to the upper tunnel through sboyka.



Backfilling with a tap opening that can feel the breath of erosion ...



The green glow emanates from DRL lamp without the bulb used as ionizing.



Approach to it is not recommended, but individuals such as the ignat_chernyaev more than comfortable in her light.



Dismantle the backing towards the Forest.



But back perhaps to the new tunnels. The photo germodver separating station built Metrostroi and Italian shield Victoria.



At the other side.



Before the start of "Italian" tunnel is insanely syurnaya assembly chamber.



"Italian" tunnel. It features a larger diameter and polymer joint. Apparatus canvas laid on the gravel bed, to reduce the effects of vibration from the trains at the tunnel.



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