Geotechnical facilities

Diaphragm walls bear with its static function the ground and water pressure and transfer them into the ground, through anchoring or ground resistance in its lower part. First of all, the excavation pit shall be made, in which guide walls are set up. They represent a kind of template for the diaphragm wall and define construction pit shape. Furthermore, they ensure correct direction of grapple and stabilize the upper zone of diaphragm wall. The diaphragm wall is executed in panels. In the course of diaphragm wall construction a bentonite suspension is used, which strengthens the ground through its hydraulic pressure. When advancing with the excavation works and as a consequence of suspension loss in the underlying ground, it is necessary constantly to be refilled. After the required depth is reached, reinforcement package is lowered and then the panel is filled with concrete.

This method treats the execution of diaphragm walls with special diaphragm wall equipment.

The diaphragm walls are formed out of reinforced concrete elements, executed one by one in the ground. This type of construction is able to perform support-, reinforcement- and water resistant functions, which determines their application field. The most frequent use of diaphragm walls is the excavation strengthening in urban conditions.

Construction by the means of piles is one of the oldest methods. It is applied in soft and water saturated soil or in tide construction sites. Piles differ by their type of construction, deployment and method. According to their construction they are distinguished in single, tangent and secant piles.

Reinforcement cages are prepared in advance and installed in their entire length or in sections, after which they are concreted in the borehole. Secant piles are executed one after the other – reinforced – unreinforced.

Euro Alliance Engineering JSC offers exclusively new generation of driving piles under the system FRANKI, which demonstrate big pile loads.

The fundamental concept of soil nailing consists of reinforcing the ground by passive inclusions, closely spaced, to create in-situ a coherent gravity structure and thereby to increase the overall shear strength of soil and restrain its displacements. The basic idea consists of transferring tensile forces, generated from the inclusions into the ground through the friction, mobilized at the interfaces.

IBO Self-drilling Anchors are successfully used for anchoring in poor ground, cohesive and non-cohesive soils, and in the case of unstable boreholes.

This system uses a series of wells, connected to a common suction manifold. A lot of well points can be connected to just one wellpoint pump. These types of systems work well in highly variable soils and in shallow aquifers, where the water is drawn down very close to an impervious layer.

Our activities:

• Drainages
• Water galleries

The sheet walls could be pressed, driven by vibrations or by hammering into the ground in compliance with the local ground characteristics. Moreover, they could be installed as dense wall, in excavated in the ground diaphragm panels. Since sheet walls are executed as barriers, which are water impermeable, it is possible at their joining with cohesive soil layer or artificial dense bottom, the need of ground water table lowering on big areas to drop out.

Our activities:

• Excavation pit strengthening
• Terrains strengthening
• Insulation against pressuring Water
• Temporary reinforcement facilities

Excavation pits are formed through soil excavations and where there are structures with basements, the underground floors are included. This involves all elements like walls, bottoms, strengthening and water retention. If underground water table is located beneath the lowest point of the excavation pit (excavation bottom), then the water table shall be lowered. This could be carried out by so called “water retention” (facility for water retention).

That can happen by the help of so called water table lowering wells. An additional possibility is bottom concreting in the form of compaction concrete slab, made of water impermeable concrete.