Prague Ring Road, Section 514 Lahovice-, SO 204, 209

Post-tensioning of the longest bridge in the

Overall view on the bridging of "514 Lahovice - Slivenec construction, SO 204" section.

The 514 Lahovice – Slivenec section is Scope of VSL's works: with mobile cranes in order to speed a part of the Ring Road under • Designer support during the application up the work progress on this section. construction. The Prague ring of the VSL post-tensioning system The design of these sections was prolongation by this section • Alternative SO 204 1.4 proposal supplied by Pontex, s.r.o. The implemented by Bögl a Krýsl, k.s., • Supply of the VSL Ec / K 6-19 post- construction of the bridge's main part, Hochtief, a.s. and Strabag, a.s. will tensioning system 1.4 dilatation of 560m in length, enable along with the 513 and 512 • Tendon placing , stressing and grouting section the interconnection of D1 and D5 motorways, which is currently only enabled by the questionable inner city construction sections called 1.1 to 1.4. belt highway. The superstructure of 1.1 to 1.3 The construction is invested by the sections formed by the box section Czech Republic Directorate of the with the typical spans of 46 and 49m Roads and Motorways, the bridge SO was made on scaffolding and on 204 is supplied by Bögl a Krýsl k.s., overhead movable scaffolding system. the bridge SO 209 is supplied by This movable scaffolding system is STRABAG a.s. and the executive equipped with a suspension travelling construction documentation is at the girder level which can be used coordinated by Valbek, s r.o. The post- to place the prefabricated cables in a tensioning of these bridges was comfortable way by unwinding them supplied by VSL SYSTEMS (CZ) Ltd. from their coils supplied from the These bridges are integrated in the preparation room to the construction. bridge elevated road across Berounka For this reason, VSL implemented this and Radotín valley. The SO 204 technology primarily for the purposes bridge is among the most important of placing in sections where movable constructions not only within this scaffolding was supposed to be used. section. With its total length of 2km However, VSL subsequently used this and the linking-up bridge objects, this method of placing PT tendons also in is the longest bridge in the Czech scaffolding locations in combination Republic. The SO 204 consists of four Stressing in a typical construction joint. designed by Novák & Partner, s.r.o., as regards the implementation OWNER: was made using the balanced procedure. The bridge was RSD CZ cantilever method. The new constructed from one of the middle construction consists of 6 fields in total spans using the stressing pockets to MAIN CONTRACTOR: with spans 72 + 84 + 101 + 2 x 114 + enable threading the pre-stressing SO 204: Bögl a Krýsl, k.s. 72m, so there are totally 2 x 5 strands with a time delay in order to SO 209: STRABAG Co. cantilevers. In the preliminary project coordinate the works due to the traffic DESIGNER: stage, VSL came with an alternative diversion in Strakonická street which is Coordinator : Valbek, Ltd. construction proposal which resulted in crossed by this flyover. SO 204 1.1-1.3 Pontex, Ltd. material savings, overall simplification The post-tensioning works on the SO SO 204 1.4 Novák & Partner, Ltd. as well as speeding up the 204 were launched in 2008, their SO 209 Valbek, Ltd. construction progress. Subsequently, termination is expected by the end of POST-TENSIONING SYSTEM: the designer integrated this proposal 2009. The total volume of the pre- VSL SYSTEMS (CZ) Ltd. into the executive construction stressing strands is nearly 1500 tons. V Násypu 339/5 documentation. Up to 4 pairs of form As already stated above, this is one of 152 00 travellers were gradually involved in the most important bridge Czech Republic the construction while pre-stressing constructions in the Czech Republic tel.: +420 251 091 680 works flexibility was crucial for a while VSL SYSTEMS (CZ) have fax: +420 251 091 699 smooth construction progress. Also, contributed to a successful realization e-mail: [email protected] the SO 209 object had its own specific of this construction in co-operation with http://www.vsl.cz features particularly their project partners.

VSL Headquarters

VSL International Ltd. Subingen, Switzerland Phone: +41 - 32 - 613 30 30 Fax: +41 - 32 - 613 30 75

VSL Regional Offices

Australia & Pacific VSL Prestressing (Aust.) Pty. Ltd., Thornleigh, NSW, Australia Phone: +61 - 2- 9484 59 44 Fax: +61 - 2 - 9875 38 94

Asia VSL Hong Kong Ltd., Hong Kong Phone: +852 - 2590 22 88 Fax: +852 - 2590 02 90

A view on the Berounka valley from the SO 209 object perspective. Central East Europe & Middle East VSL (Switzerland) Ltd., Switzerland Phone: +41 - 32 - 613 30 30 Fax: +41 - 32 - 613 30 75

Iberian Peninsula, South Africa and Latin America CTT Stronghold Spain Phone: +34 - 93 - 289 23 30 Fax: +34 - 93 - 289 23 31 Placing prefabricated cables using a The benefits of cable prefabrication are mobile crane. obvious. France & Africa French Speaking Countries Intrafor - VSL France S. A., France Phone: +33 - 05 - 61 00 96 35 Fax: +33 - 05 - 61 00 96 51

http://www.vsl.com A piertable ready for concreting . Strand coils suspended on overhead movable scaffolding system.