In St. Petersburg, there are so many sights that the visiting tourist simply has his eyes scattered. I want to see everything at once. Drawing bridges are always attracting special attention.
Neva - one of the rivers that differ activeshipping. It is sufficiently deep and wide for the passage of ships carrying out the delivery of goods and passenger transportation. At the same time, the city can not be divided into parts with a violation of the transport infrastructure.
In order to be able to function equallyland and waterways, and drawbridges are being built. Most of the time they are used for their intended purpose - they allow you to travel from one part of the city to another. At certain times, according to the established schedule or prior order, bridges are bred - in order for large ships to pass.
The basis for the construction of the drawbridge isthe possibility of moving the center of gravity. The structure is equipped with turning spans and mechanisms that drive them. As a cargo, which allows you to perform the entire operation faster and more reliably, the counterweight on the shore sections acts. The counterweight not only helps the breeding, but also keeps the whole structure in balance all the time while the span of the bridge is open.
The counterweight ensures smooth mixingspans, which in the lowered state are fixed by a special lock. Previously, everything was set in motion first by hand. Technologies have been improved, as well as larger structures. To date, the bridging of bridges is automated, driven by the automation system and electric motors or hydraulic drives.
All bridges are to be bred exclusively innight time. Each of them has its own schedule, coordinated with the others. To date, 9 bridges are bred regularly every night. A 3 - only on the application made in advance.
All wiring is entered from 1 am to almost 6 am. Accurate information about time is placed on its official resource company that provides the operation of all such facilities in the city.
This design was given its name inthe honor of the Grenadier Regiment, which is located in the barracks on the left bank of the Bolshaya Nevka. During its existence, it was repeatedly rebuilt and changed the location of the dislocation, but all the time it remained the Grenadier Bridge.
A bridge with such an appellation leads its history with1758 years. Initially it was just a floating ferry, otherwise a pontoon. This was the fifth such construction in the city. Even then, the Grenadier Bridge had a section that was withdrawn from the convoy for passage of ships.
The bridge repeatedly changed its location,because it had a temporary character. In 1905, at last became more or less permanent. The Grenadier Bridge became a wooden structure in 12 spans. There was also a raised span, which moved with the help of hand winches.
Almost 50 years later, the Grenadier Bridge was again rebuilt. At the same time, the number of spans was increased by 6, and those that were turning were lined with metal sheets.
In the 70s of the last century a new projectGrenadier Bridge was ordered from engineer Levin B. B. and architects Noskov L. A and P. Areshev. At the same time, the structure slightly changed its location, descending downstream. The final version had 3 spans on reinforced concrete pillars, of which only the middle one was rising.
The remaining bridges are bred regularly, this actionis captured by a lot of local residents and visitors. Such a photo of the Grenadier Bridge in St. Petersburg is a rarity, as its breeding is carried out only if necessary and infrequently.