Bridge builders completed the lifting of the railway arch span Crimean bridge on fairway supports - to a height of 35 meters above sea level. The structure weighing more than 6,000 tons was lifted with the help of lifting equipment under the supervision of the leading engineers of the project. The process of raising the arch to the design height took about 12 hours. During the day, the arch will be fixed. Reports about it Information centre"". “The ascent went smoothly. Up to the mark of 10 meters we went more slowly, did a lot of control tests, carried out geodetic control over the state of the structure. Then the main climb began. The arch was raised slightly above the design height for subsequent lowering onto the supporting parts. During the next 24 hours, the structure will be equipped with wind braces - these are devices that fix the arch," said Mikhail Piksaev, Deputy Director for Production of Mostootryad-1. The arch was raised on 700 cables with powerful jacks fixed on supports. For the installation of the overall structure, 16 devices were required, each with a carrying capacity of 650 tons. This made it possible to increase the margin of safety for lifting mechanisms by 40%. Read: Jacks were loaded gradually. The initial load of 5 tons was increased to 100 tons. The structure was raised without deviations, within the alignment between the two supports. After the "detachment" of the arch from the floating system by one meter, it was kept suspended for an hour. During this time, the specialists once again checked the reliability of all mechanisms and only after that continued the ascent. This work was attended by 30 engineers, slingers, surveyors and quality specialists. The floating supports, with the help of which the arch was towed, returned to the Kerch coast. They will be rechecked and re-equipped, after which the second arched arch will be transported and installed in the same sequence. superstructure- road. As a result, two arched spans will rise above the fairway, under which ships will pass unhindered. In the next month, the builders will mount the end elements of the arch, as well as unroll it - lower it onto special supporting parts. Installing the arches of the Crimean bridge in the design position is a unique technological operation. For the first time in the history of domestic bridge building, transportation, positioning in sea conditions and installation from the water on supports of an overall navigable span are carried out. The maritime operation is carried out in conditions of limited navigation with a time "window" of 72 hours. In general, the operation brought together more than a hundred specialists - sailors, specialized engineers, employees of research institutes and ordinary bridge builders.
SIMFEROPOL, August 29 - RIA Novosti, Maxim Groznov. The railway arch of the bridge under construction across the Kerch Strait weighing 6,000 tons is fixed on the fairway supports at a height of 35 meters above the water level, the Crimean Bridge information center reported.
The operation to install the railway arch span of the bridge across the Kerch Strait began on Sunday morning, shipping traffic in the strait was suspended for 72 hours. The arched span, 227 meters long and 45 meters high, was transported to the fairway supports with the help of floaters. Late in the evening on Monday, the arch was lifted with the help of powerful jacks, which was successfully completed on Tuesday morning.
"The railway arch of the Crimean Bridge has been raised onto the fairway supports and securely fixed at a design height of 35 meters from the water. The ship and aeronautical signaling system is already working on the structure. The final installation on the fairway supports will take another three weeks," the report says.
"The production of the arch, its assembly on the stocks during the year, the manufacture of the floating systems on which it was loaded, the fixing of the arch on powerful fairway supports: all together - this is a unique operation. We have assembled the best specialists who were able to do this, and we are very grateful to them for this," Arkady Rotenberg, Chairman of the Board of Directors of Stroygazmontazh LLC, quoted the information center as saying.
© Infocenter "Crimean Bridge"
© Infocenter "Crimean Bridge"
The floating supports, with the help of which the arch was towed, returned to the Kerch coast for testing and re-equipment. After carrying out the necessary procedures, a road arch weighing 5,000 tons will be transported and installed. As a result, two arched spans will rise above the fairway, under which ships will pass unhindered, the Crimean Bridge information center noted.
The bridge across the Kerch Strait, which will connect the Crimea and the Krasnodar Territory, will be the longest in Russia - its length will be 19 kilometers. The start of traffic on the bridge is scheduled for December 2018.
The most difficult stage of a grandiose construction. In the Crimea began to install the railway arch of the bridge across the Kerch Strait. The gigantic structure, which weighs six thousand tons, will gradually, step by step, have to be raised to the design height, which is no less than 35 meters. Shipping has been stopped, all precautions have been taken.
The snow-white beauty weighing six thousand tons has been attracting increased attention for the second day. The rise of the arch should begin soon. Now the testing of lifting elements is being completed. This operation has no analogues in the history of Russia, so they are being prepared very carefully.
Ahead is one of the most important stages of the grandiose construction - the workers must assemble a multi-ton structure, connect the bridge supports and the arched span together. It is planned that the arch will be raised to the design height of 35 meters already in the evening and at night. Slowly and carefully, at a speed of approximately five meters per hour. Accordingly, the entire operation will take more than seven hours.
The arched span was delivered to the installation site that night.
“A unique operation was performed tonight, in principle, this is the heart of the bridge. This arch was delivered to the fairway and will be installed in the alignment of the bridge, ”said Arkady Rotenberg, Chairman of the Board of Directors of Stroygazmontazh.
“Everything that was done this night is, in principle, the hard work of the whole team for more than six months. Certainly, there are specifics, because six thousand tons, plus the weight of the displacement of the floating supports themselves, plus more than four thousand square meters of sail area of the span, despite its such an openwork appearance, plus the transportation route, although it is short, but still it is turns, and the object is heavy, overall - more than 250 meters long,” said Viktor Slobolinsky, head of the marine operation for transporting the arch of the Crimean bridge.
The journey of more than four kilometers was overcome in an hour and a half. Here, the floating system was pulled up to the bridge alignments and fixed with anchor cables. The lifting operation involves engineers, slingers, welders, surveyors and quality control specialists. Any possible deviation from the intended course will be noticed instantly - 20 sensors are installed on the arch - strain gauges that monitor any changes in the structure.
“Sensors that allow you to control the change in the stress-strain state. All controlled parameters in the monitoring process, regardless of whether the sensors are on the arch or the sensors are on floating pores, or on supports, all these parameters flow into one center and are monitored in real time, ”explained CEO Research Institute of Diagnostics Svetlana Bokhanova.
Before the completion of the naval operation, the engineers have a little more than a day. Therefore, the work does not stop even for an hour. It is necessary to have time while the weather is good and there is no strong excitement on the sea. For the duration of the operation, navigation in the Kerch-Yenikalsky Canal was stopped, the captains of the ships were warned in advance. Since the restriction on both sides of the strait, only 28 ships have been waiting for transit wiring, which is several times less than, for example, when delayed due to bad weather.
As soon as the builders complete their work on the fairway, the pilots of Rosmorport will promptly guide the vessels along the canal, and they will be the first to pass under the railway arch of the Crimean bridge. In September, exactly the same engineering operation will be carried out with an automobile arch.
PART 1, TRAGIC
As it became known just now, the installation of the railway arch of the Kerch bridge, scheduled for today, was canceled by order of the court of Wroclaw (Poland).
The decision was made today, around 08:00 CET. As interim measures, the court allowed Ukraine to use the military assistance of its allies.
Immediately after the decision was made, Ukraine turned to the United States, and units of Navy SEALs, numbering up to 2 battalions, moved to the construction area from the Fort Bragg base (Fateville, California, USA). According to unconfirmed reports, they are armed, in addition to the standard, Javelin anti-tank systems.
Both submersible pontoons, on which the arch now rests, have been captured by a surprise attack from under the water, and at the moment there is a battle between supporters of Ukraine and a special detachment of GRU penal officers, who are promised the removal of penalties if they manage to recapture the pontoons.
In addition, 2 squadrons of snipers trained at the KTsDiTO are urgently transferred there from Moscow.
The latest aircraft carrier Gerald Ford is sent to the conflict area to provide air support for the SEALs. Now he is abeam Constanta, but he will approach Kerch no later than tomorrow morning.
According to experts, the live video broadcast, supposedly from the construction site, has at least 17 out of 20 signs of forgery, and in fact, most likely, it was organized from a satellite from the Novosibirsk or Yekaterinburg region.
It is expected that after the establishment of full control over the object [the arch], the commander of the American landing force, Corvette Colonel Steve Gregory, will announce the transfer of sovereign rights to it to the Ukrainian side.
The delegation of the European Parliament with the appropriate powers is ready to fly to the scene at any time in order to confirm the legitimacy of the process.
PART 2, OPTIMISTIC
Calm, the wind is silent.
Shipping in the Kerch Strait has been suspended since midnight. An online broadcast of the process has been launched.
06:00 On this moment visually, the railway arch of the Kerch bridge is already on floating piers (pontoons). Tugs are nearby.
07:00 An airship hangs over the Kerch Strait, which transmits weather data online to the builders of the Kerch Bridge.
08:00 Visually nothing is happening at the Kerch technological site. The loading operations of the superstructure will last about 15 hours. Perhaps now there is a confirmation of the weather "window", as the wind began to intensify.
08:15 Recall what happened at the Kerch TP yesterday: the pontoons were filled with ballast, after which they were brought submerged under the arched span. Then the floating supports were precisely oriented under the railway arch, and the pumping of the ballast began. At the moment, the floating supports can start pumping out the ballast again at any time in order to take on the entire load of the arch and lift it above the haulage pier.
08:30 The process of removing the arch from the pier and taking it to the floating supports will take another 2-3 hours. Every millimeter of movement of pontoons and arches will be monitored by specialists.