More Images 
|
Sea Towers, Gdynia, Poland
Maximum adjustment to meet complex site requirements
with modular RCS and ACS construction sets
When completed, the new "Sea Towers" high-rise complex overlooking the Gulf of Danzig will have an overall height of 138 metres. The building consists of two connected towers with 28 and 36 floors respectively. Situated directly on the harbour front as well as being centrally located, the structure will eventually provide around 32,000 square metres of inner-city residential, office and retail space – with a very impressive view of Danzig and the surrounding area.
Naturally, having a location directly on the coast itself results in tremendous wind loads which had to be taken into consideration for the construction work. Therefore, general contractor Porr Polska and Modzelewski & Rodek, responsible for the concrete shell, decided on a safe and crane-independent climbing combination from PERI comprising of RCS climbing protection panel and proven ACS self-climbing formwork.
From the fourth floor onwards, the RCS climbing protection panel completely encloses the slab edges. This means that site personnel are effectively protected against the risk of falling and strong winds at all times. This feeling of safety substantially increases the productivity on the construction site.
With the RCS rail climbing system, fast and safe climbing can still be carried out even during strong wind conditions because the continuous connection of the scaffold unit to the structure by means of the climbing rail and shoe prevents any drifting. Mobile self-climbing devices move the RCS units to the next section without the need of a crane. The hydraulic cylinders have a 5 t lifting capacity and can easily be moved by hand - this minimizes the self-climbing technology costs and saves on expensive crane operations.
The structure tapers continuously upwards and exhibits a different ground plan on each floor with irregular building edges along with numerous projections and recesses. For this, PERI engineers created a detailed plan of operations whereby the permanent adjustments required for all floors have been taken into consideration. Between the standard cycles with open slab edges there are also sections of external walls with reinforced concrete to be constructed. With the use of the rail-guided RCS climbing protection panel, this means that the majority of the RCS units are moved upwards by means of the slab shoe as well as the wall shoe. Finishing platforms allow subsequent safe dismantling of the RCS wall shoes.
The PERI self-climbing technology is not an unknown quantity for the experienced site crew and the reinforced concrete walls for the stairwells and elevator shafts were formed with the help of the ACS modular construction system. Due to the cramped structural dimensions, the ACS G and ACS P versions, together with the mere twelve centimetre narrow TRIO panel formwork, provide the best solution. Thus it is possible to concrete the slab and wall monolithically in only one operational sequence. This construction method shortens cycle times and saves time-consuming reinforcement connections.
In spite of the complicated and changing building geometry, one floor is being completed in only eight days in both towers using the PERI solution. In order to also shutter and strike the floor slabs within the specified, tightly-scheduled time frame, the lightweight SKYDECK panel slab formwork provides the optimal supplement for the climbing formwork. Due to the low individual weights of the SKYDECK components, work can be carried out quickly and without any effort.
For connecting the two towers at a height of 45 metres – the so-called Skywalk – PERI engineers developed a practical solution. Attached to both towers, the construction formed not only a support level but also a working level.
Already during the construction of the three base storeys, MULTIPROP aluminium props provided proof of their efficiency. Connected with MULTIPROP frames to form load-bearing towers, shoring for the high slabs and wide cantilevers could be created. In order to efficiently form both the straight and circular wall sections, the PERI wall formwork system TRIO was used as well as RUNDFLEX.
|
| PERI Systems In Use |
RCS P Climbing Protection Panel
RUNDFLEX Circular Wall Formwork
TRIO 330
ACS G Self Climbing System
SKYDECK Aluminium Panel Slab Formwork
ACS P Self Climbing System
|
| Contractors: |
Porr (Polska) S.A., Warsaw (General Contractor); Modzelewski & Rodek Sp. z o.o., Warsaw (Concrete Shell) |
|
Field Service:
|
PERI GmbH, Deutschland
PERI Polska Sp. z o.o., Polen
|
|
PERI Press Release 08/2007
|
|
