New Urban Motorway Ringroad for Prague - Novák & Partner s.r.o.

Case Study

The Czech Motorway Directorate contracted the Prague-based engineering company Novak & Partner s.r.o, part of the Valbek Group, to carry out the structural engineering of two kilometre motorway bridges to span the Lahovice valley through which the River Berounka flows.
For complex bridge building projects, the engineers of Novak & Partner and their colleagues in the parent company Valbek use modern IT computing models such as PONTI bridge construction software from RIB.
Supported by the PONTI system, it was relatively easy for us to model the balance beam principle and the bridge sections involved and produce an overall model of pillars, surfaces and pile foundations.

Bypass to Relieve Traffic Congestion in Czech Capital

The new southern ringroad around Prague, scheduled for completion in summer 2010, will be more than six kilometres long. The new bypass for the Czech capital, begun in the second half of 2006 by contractor MAX BÖGL & JOSEF KRÝSL, stavební firma, kom. spol., comprises a 1.7 km tunnel, two motorway intersections and a total of 14 bridges. The 2-kilometre bridge over the Berounka valley is the longest bridge in the country.

According to Alfred Brunclik, Director of the Road and Motorway Directorate of the Czech Republic, the country anticipates a considerable increase in transit traffic in the next few years. So far, lorries have driven through the city, which is a particular problem for Prague during the rush hour. At peak times, the entire southern area of Prague is permanently congested, which is the reason why the Motorway Directorate decided to link up all the motorways and expressways around the city to form a ringroad. The construction project is to cost nine thousand million Czech crowns altogether and is being funded by the EU, the European Investment Bank and the Czech State Fund for Traffic Infrastructure.

Lahovice viaducts: the largest bridge building project of the Czech Republic

The Czech Motorway Directorate contracted the Prague-based engineering company Novak & Partner s.r.o, part of the Valbek Group, to carry out the structural engineering of two kilometre motorway bridges to span the Lahovice valley through which the River Berounka flows. The company’s bridge engineering experts accepted the challenge of what is currently the largest bridge construction project in the Czech Republic. The bridge is being constructed in five stages. One section is being built using the cantilever method, with the cantilever construction extending over 560 metres of the total length of the bridge of two kilometres. The four other stages will each involve solid bridges on falsework. The engineering for these sections of the bridge was done by Valbek, spol s.r.o., contract partner for the whole construction project, for two fixed falsework stuctures and the company Pontex s.r.o for the movable falsework. The two companies are also based in Prague.

For complex bridge building projects, the engineers of Novak & Partner and their colleagues in the parent company Valbek use modern IT computing models such as PONTI bridge construction software from RIB. The Prague structural engineers found these models particularly useful in the design phase for the cantilever – from preliminary design and dimensioning through to cross section modeling – and for comparative calculations. Other software of various manufacturers was also used. The final engineering stage also took creep and shrinkage into consideration as well as other time-dependent effects of staged construction.

Software system for complex constructions

Project Manager Dipl.-Ing. Milan Sistek and his colleagues at Novak & Partner appreciate the possibility offered by PONTI to easily define traffic loads and load macros. The software also facilitated the input of the prestressing cables. “PONTI features a large number of construction states for bridge construction projects,” comments bridge construction engineer Dipl.-Ing. Vladimír Engler. “Supported by the PONTI system, it was relatively easy for us to model the balance beam principle and the bridge sections involved and produce an overall model of pillars, surfaces and pile foundations”.  Independently of other software used in the project, the entire model always adapts automatically to the overall design – another advantage for the engineers. And as bridge engineering structures – like those in the Lahovice valley – are usually so complex that they have to be optimised by hand, PONTI also offers the option of querying interactively stress resultants which is useful for the manual adjustment of the drafts. “We have been designing bridges with RIB’s PONTI® for nine years,“ says Engler. “Even for particularly unconventional constructions, the system has always given us comprehensive support,” he concludes.

Technical Details

  • Ground-Plan-Extension 750m, in parts 12,000m
  • Box girders with 6 sections, one independent main girder for each traffic direction
  • Span widths: 72.0 + 84.0 + 101.0 + 2 x 114.0 + 72.0 m
  • Bridge width: 14.50 + 15.25 m or construction width 14.00 and 14.75 m
  • Construction height: variable height: 3 m in the section up to 6.5 m above the pillars
  • 25 m to 40 m high pillars with variable cross sections, divided into 2 walls on each side with a thickness of 1.2 m or 1.4 m depending on the span of the adjoining sections
  • Deep pile foundations of an average of 1.52 m
  • Load-bearing capacity as per Class A of CSN 73 6203 & amendments a/88, b/89



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