References
Parus Office Center (Mechnikova Street)
UKRAINE, 2003-2005
Foundations and structural work for a tower with 31 floors and four basement levels.
Osnova Solsif, Solétanche Bachy's Ukraine subsidiary, was appointed to build the foundations and all structural framework (concrete core, floor slabs, walls) of the Parus Office Center in Kiev. The tower has 31 floors and 4 basement parking levels and is located in the centre of a new business district and at the intersection of the city's main roadways.
The foundations
The initial work involved building a Berlin-type retaining wall with anchors beneath the street for excavations to be carried out to produce a horizontal work platform at an elevation of + 144.00. A diaphragm wall 0.80m thick and 32 m deep and with a perimeter of 265m was then built down from the platform. Outside the area of the building, 579 C.F.A. piles were constructed down to a depth of 23m and metal struts fitted to extend the excavation down to the third basement level.
The barrettes, 2.80m long with a thickness of 1.00m, were installed from the new platform and were fitted with plunged steel columns to carry a ring slab on basement level 3. Once the barrettes were installed, the ring slab was cast in situ.
Structural
All the structural work, except for the core, was carried out using traditional techniques and a tall tower crane.
The superstructure of the central core of the tower was built using DOKA SKE-50 automatic climbing formwork, enabling three floors to be completed each month, with excellent quality and operator safety. The central core is 24m long and 8m wide, and, not counting the perimeter wall, features 6 internal walls, with a total of 150m3 of concrete for each floor. The use of this method meant that it was possible to perform regular, repeated cycles of formwork erection, reinforcing, pouring and striking, with minimum manpower and a high production rhythm.
MAIN WORKS QUANTITIES:
• Diaphragm wall : Perimeter 265m ; thickness 0.80m ; depth 32m
• Tower foundations barrettes: 52 units of which 42 are fitted with plunged steel columns
• Building foundation piles, excluding the tower : 579 units of diameter 820mm and depth 23m
• Structural:
- 4 basement levels: 12,206m2
- 31-floor tower: 60,000m2
- Total tower height: 131m
- Concrete: 47,600m3
Techniques
Regardless of site size, and providing it involves a significant proportion of works in the ground, Soletanche Bachy will handle the complete project, and all aspects of the works, including site supervision, excavations, foundations, civil engineering and all construction operations.
A diaphragm wall is a reinforced concrete wall that is made in situ. The trench is prevented from collapsing during excavation, reinforcing and casting by the use of supporting bentonite slurry. The slurry forms a thick deposit (the cake) on the walls of the trench which balances the inward hydraulic forces and prevents water flow into the trench. A slurry made of polymers can also be used.
A pile is a structural element driven into the soil for transferring loads and prevent deformation. Its slenderness ratio is not limited.
Pile shafts can be uniform and rectilinear, telescopic and belled out.
Piles can be installed either separately or in groups. They can also form a retaining wall, a mixed curtain wall, contiguous piles, secant piles and composite curtain walls, such as Berlin walls and similar. Piles are also used as precast beams to be placed in the structure of the building they support.
Ouvrages
Suitable foundations are required for all building and civil engineering structures to ensure that they perform within the settlement criteria established in the design of the structure. Special foundations are used where shallow footings do not provide adequate support for a structure.
Major urban excavations are one of the specialist activities of Soletanche Bachy. Such excavations are required for basements to buildings that are usually part of the foundations of the structure and also used for under-street car parks, cut and cover tunnels for roads, rail, metro and storm water tank...
Voyage au coeur de l'ingénierie de pointe
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