At half past one in the morning, the construction site of the highway bridge in Hungary was in a good mood. At exactly half past one in the morning, the builders managed to successfully complete the turning maneuver of the entire bridge. And just like less than a month ago, when they were turning the first part of the bridge, they did not use the entire lockout, which was scheduled for 4.40 hours, for a complicated maneuver.
“When we turn the bridge, we will put up a footbridge from which it will be possible to move from one rocker to another and slam champagne,” construction manager Vladimír Dubšík planned on Friday, when the rotation of the second half of the bridge began.
The workers did not have to be afraid of the overhead line over the railway. Throughout the construction, the trolley in the area of the bridge is without current.
The Roads and Motorways Directorate considered this maneuver to be the most difficult during the construction of the new section of the D35 motorway from Časy to Ostrov u Vysokého Mýta, which should be open to drivers on 22 December this year.
The second sliding maneuver under the 27-meter-long track was completed faster than before. During the April closure of the bridge, the builders moved the reinforced concrete track by 18 meters during the first day, this time they moved the rocker weighing 4,300 tons by 21 meters.
“He who deletes goes,” the minister praised
“We were amazed at how little we spin. The hydraulic press has the option of pushing with a force of 200 tons, but we only push with 25 tons, “said Dubšík to move the temporary support over Teflon plates lubricated with a special lubricant.
“Whoever deletes, goes,” jokingly commented on the demanding maneuver on the spot, Minister of Transport Martin Kupka, who came to see the turning of the bridge. “I’m returning to construction after a while. This is an important technological part. The first motorway bridge in the Czech Republic is being built in this way, “added Martin Kupka to the technologically demanding event that the experts had been preparing for two years.
The whole operation is almost over, the last closure is planned for the night from Monday to Tuesday between 22.40 and 4.40, when the builders will carry out finishing work.
The builders still have to concrete a gap 1.8 meters wide between the two rockers. If further work goes smoothly, the bridge deck should be completely completed by July 10.
The highway bridge near Hungary crosses the railway diagonally. Two parts of the bridge, called rockers, were built along the track. They both turned over the track and now connect them. The bridge will be over 170 meters long.
During the maneuver, both rockers rotated on a pillar with the help of a steel temporary V-shaped support, which was moved by a hydraulic cylinder in a solid reinforced concrete track 27 meters long.
A more common technology in building larger bridges is their extension. The advantage of the new method is, among other things, that it does not require long-term exclusion. “It is a novelty, it is given by the location where we are located and the importance of the line over which the D35 motorway bridge leads,” said Radek Mátl.
In Hungary, the bridge will cross six tracks at once, moreover obliquely. The D35 motorway will run at the abutment point about 11 meters above the current terrain so that the underpass height of the railway line is maintained. In October last year, during the concreting of one rocker arm, the builders found that the side prefabricated struts of the part had fallen by at least five centimeters. The railway administration in the section reduced traffic, which caused a great delay of trains on the main corridor line.
It will be built closer to Mohelnice using PPP
Although the decline has caused complications, according to Minister Kupka, the construction of the highway from Časy to Ostrov is proceeding according to plan and nothing should jeopardize the completion date, which is scheduled for December 22. “We are aiming for cars to be able to drive here before the end of this year, and the entire other important section of the D35 motorway has been put into operation. Even according to what I hear from the contractors and they really got it, I believe that it will be possible to manage it, “he added.
The Ministry of Transport also plans to use the method of financing the so-called PPP project on the sections of the D35 motorway from Opatovce to Olomouc. “We are preparing PPP financing for the farthest sections that are closer to Mohelnice, as is the case with the D4 motorway. We really want to achieve in the shortest possible time that Prague connects with Olomouc and thus creates a parallel road next to the D1 motorway, “said Kupka.