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The facility is being built using technology applied for the first time in Bulgaria
The penultimate section 20 of the viaduct, which is being built before the Zheleznitsa tunnel on the Struma highway, which travels from the capital to Kulata, has been successfully pushed. With this, the bridge between the two pillars of the installation is practically carried out, announced the Road Infrastructure Agency.
The viaduct is built using an innovative technology for Bulgaria: one stroke thrust of the superstructure with hydraulic jacks. Its characteristic feature is that a workplace is used for the production of the individual elements, which are lifted and pushed forward with a hydraulic system, since each element is mounted in front of the finished one.
The last section 21 of the highway to the capital will be advanced at the end of October. After that, the builders will begin construction of the road for the Tower, and the goal is to complete the bridge installation by February 2021. All construction works are carried out without stopping traffic on E-79.
The bridge crosses 6 obstacles: the Struma River, the E79 road, the current and future railway line, the municipal road and the tunnel service road. The road to Sofia is 560 m long, and the road to the Tower – 510 m. The installation height in different parts is between 10 m and 18 m, and the distance between the columns is in the range of 45 to 60 m.
Excavation work on the Zheleznitsa tunnel, the longest road tunnel ever built in Bulgaria, with a length of about 2 km, is also progressing. The first 650 m have already been reached in both ducts on the north side of the facility. On the south side, 765 m were excavated in the pipeline for Sofia and 680 m in the pipeline for the Tower.
The tunnel is built according to a new Austrian method by digging approximately one and a half meters – two in each pipe and direction in one day, and immediately after that, the primary lining of the facility is made with fasteners, shotcrete and anchors.
Construction work began in October last year and the site is open 24/7, and the goal is to complete it by March 2022. The tunnel will be equipped with lighting, ventilation, video surveillance, alarm fire fighting, intelligent low consumption traffic management system. , SOS emergency cabins, audio and radio notification, electronic access control system, etc. A helicopter pad, two bridges over Suha Reka, 108 m and 18 m respectively, a retaining wall, etc. are being built in the subdivision.
The Struma Highway railway tunnel construction project is co-financed by the European Union Cohesion Fund and the national budget through the OP Transport and Transport Infrastructure 2014-2020. The section has a total length of 4.4 km and is divided into 3 subsections, including the tunnel, and a service road on both sides of the facility.
The section before the tunnel, which goes from Sofia to the Tower, where the viaduct is located, is 720 m long, and the next 1.4 km. An emergency connection is being built on this section, which in the event of an unforeseen event in the tunnel will be able to divert traffic towards Sofia along the E79 road.
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