Administrative building of JSC "AK TRANSNEFT" was built by Austrian company "ILBAU" in rather confined premises at: Bolshaya Poljanka Street, property. 59, building 3 close to existing administrative building which was constructed earlier by diaphragm wall technology.

Geological composition at site is represented by the following: (DWF-drawing, 5 Kb)

3-3.5 m fill up soil, incorporating construction debris;

12 m clayey sands with gravel, middle-sized sand and fine-sized.
 

The level of ground water is practically 1 meter below the foundation slab foot.

The pit was enclosed by in-situ reinforced diaphragm walls, thickness 60 cm, gross area 890 m², which acted as bearing and anti-filtration structures at the same time.

Diaphragm walls were constructed by application of hydraulic grab equipment by technology developed by French company "SOLETANCHE BACHY", providing for sealing of joints between panels by "Waterstops".

Trenches were excavated under protection of bentonite slurry by portions 6.3 to 7.1 meter long. The quality of joints between diaphragm walls was secured due to using of L-shaped corner portions.

High quality of joints between panels (to exclude any mud joints) was ensured by removable stopends ("Stopsol") of preliminary trench portions, as well as by preliminary excavation of secondary and following portions until removed.

In order to ensure mutual deformation of zero cycle structural elements in the diaphragm walls it was provided to leave longitudinal grooves and rebar outlets in joints between foundation slab and floor slab.

Grooves in diaphragm walls were formed by filling the required zones of reinforcing cages with polystyrene foam blocks, covered in PE film t=0.16 mm and fixed to working reinforcement by metal wire.

Small sizes of enclosure and depth of the excavation pit defined a clearly expressed spatial nature of diaphragm walls action, this being confirmed by corresponding calculations.

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