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Motorway Bridge T4, Greece

Heavy-duty shoring towers and large-span truss girders for bridge construction can be systematically assembled with VARIOKIT core and system elements.
PERI design engineers combine two modular construction kit systems to form a comprehensive shoring concept for heights up to 20 meters.
The two VARIOKIT heavy-duty shoring towers transfer a total load of 2,400 t, and, due to the long utilization time, high earthquake as well as horizontal loads have to be taken into consideration for the planning.
The VARIOKIT heavy-duty shoring towers can be bundled to form two 42-leg power packages in order to transfer the enormously high loads at the connection to the steel arches.
The two load-bearing systems, VARIOKIT heavy-duty shoring tower and PERI UP Rosett Flex are precisely adjusted to the static and geometric requirements.
By halving the 150-cm basic grid with 75-cm long horizontal ledgers, optimal system adaptation for concentrated loads is achieved with PERI UP Rosett Flex.
The combination of flexible and versatile system elements to form the overall PERI solution from one source saves time and money on the jobsite – and simplifies the official proof for verifiable structural calculations.
VARIOKIT heavy-duty shoring towers and truss girders are used as load-bearing shoring for the boundary segments of a 412-m long motorway bridge.
The V-pier at one third of the way along the motorway bridge carries the cast-in-place carriageway at a height of 25 m and at the same time serves as a starter section for the steel arch which is installed later.
Heavy-duty shoring towers and large-span truss girders for bridge construction can be systematically assembled with VARIOKIT core and system elements.

Projekt adatok

Helyszín: Paradeisia-Tsakona, Görögország

The 160-km long A7 motorway connects Kalamata in the south to Corinth in the northwest of the Peloponnese peninsula. The principle element being used to close the gap between Paradisia and Tsakona is the 390-m long arched bridge – known as "T4" – whose completion has been scheduled for early 2014. Two-thirds of the 22-m wide bridge superstructure will be suspended on a steel arch and realized using the steel composite construction method. For the northern bridge section, a pre-stressed concrete superstructure variant was selected which features a twin-cell hollow box cross-section.

Projekt követelmények

  • The supporting element of the motorway bridge is a huge, almost 30-m high inclined twin-pillar pier with an asymmetric V-shape. On the one hand, this serves as an intermediate support for the in-situ concreted carriageway and, on the other, as a support and starter section for the steel arch.
  • Polygonal, 32° to 36° shallow pitched inclined piers on both sides of the bridge, in eight segments, each 4.50 m long.
  • Shoring structure for a 2,400 t load

Ügyfél

Alpine Bau G.m.b.H. / Terna A.E. Joint venture

Ügyfél előnyök

  • PERI developed a comprehensive formwork and scaffolding solution – for the fabrication of the piers and the reinforced concrete superstructure as well as the temporary support of the bridge during the construction work.
  • Only rentable system components and construction-compliant, type-tested connection means was used.
Portrait of Nikolaos Donas, site manager at ARGE Alpine Bau G.m.b.H. /Terna SA
Nikolaos Donas
Site manager

PERI convinced us with the best technical and most cost-effective formwork and scaffolding plan. We were thus able to always make the optimal system choice together with PERI’s design engineers – adjusted to the complex project requirements. Apart from the technical support during the planning and construction phase, I would especially like to highlight the jobsite support as well as the provision of material according to the progress at the jobsite.

PERI megoldások

  • Basically, it is two modular construction systems combined with each other which transfer the high loads safely into the ground. The two shoring systems VARIOKIT heavy-duty shoring tower and PERI UP Rosett Flex are exactly adjusted to the static and geometric requirements.
  • With help of the PERI UP Rosett Flex modular scaffold system, forming a spatial load-bearing structure for the piers and superstructure formwork is formed, gradually increasing up to the total support height of over 20 m to the rear and upwards respectively. By means of 25, 50 and 75 cm long ledgers, the 150-cm basic grid can be adapted to suit the geometric and static requirements extremely flexibly.
  • The VARIOKIT modular construction system also forms the basis for the heavy-duty shoring. In the connecting area between the cast-in-place bridge and steel arch, two 17-m high, 42-leg VARIOKIT heavy-duty shoring towers are used to accommodate high loads. Each of the two towers has to carry loads of 1,200 t and, due to the long utilization time, high earthquake as well as horizontal loads. PERI engineers combine four standard towers, each with a 2.00 m by 2.00 m axis dimension, by means of several bundled 37.5-cm additional frames to form two power packages.
  • VARIOKIT heavy-duty shoring towers and truss girders are used as load-bearing shoring for the boundary segments of a 412-m long motorway bridge.