Residential and commercial buildings
Foundations for residential and industrial buildings. We offer comprehensive solutions (execution, or design + execution) for foundation of buildings constructed in difficult soil and/or location conditions, where it is not possible to apply direct foundation solutions in the natural ground.
• excavation support systems with sheet piles, drilled pile walls made of piles, micropiles or reinforced DSM columns or jet-grouting columns;
• construction walls of underground storyes as pile walls or sheet pile walls;
• sealing of excavation bottom using the DSM or jet-grouting technologies;
• strengthening of foundations of buildings adjacent to deep excavations by means of micropiles or jet-grouting columns.
Piled foundations. Piled foundations allow for transferring high compression and tension loads onto soil, minimizing settlement/displacement of the structure and decreasing the dimensions of caps/thickness of bottom plates. Piled foundation also allows for working in very difficult soil and location conditions, such as offshore sites or thick low bearing soils. Quality and capacity/stiffness tests that accompany piling works provide full information on the real parameters of installed piles, which practically eliminates the risk of incorrect design or execution of foundation. A wide range of precast pile dimensions, from 0.2x0.2m to 0.4x0.4m, allows for foundation for both very heavy and light constructions. Recommended loads on single piles of the said dimensions range from 400kN to 1,600kN. Similarly, high capacity parameters and settlement/displacement limitations enable to construct foundations on drilled micropiles with single and multiples injections or self-drilled micropiles. Due to their lower capacity and higher costs of implementation, micropiles are installed, if traditional piles cannot be applied (e.g. due to limited working platform dimensions, inside existing buildings, for compression and tension anchoring, in rock beds or in situations when high compression and tension forces should be transferred). Displacement piles formed in the ground and drilled piles, due to lower capacities and higher settlements as compared to precast piles, are installed in locations where precast piles cannot be effectively used (e.g. in close proximity to hospitals, libraries, old people’s homes, etc.).
Soil improvement. Ground improvement for direct foundations is usually performed in relatively thin (up to several metres) low-bearing strata of low stiffness with a underlying layer of stiff bearing soil. Ground improvement with various types of columns allows for transferring loads onto the bearing soil and achieving the required capacities as well as limiting settlement of direct foundations. Foundation on improved soil usually generates significantly higher settlement than piled foundation. Therefore soil improvement is applied only for constructions less sensitive to higher settlement values/settlement difference.
Excavation support systems. Excavation support systems are used to ensure safe operation deep under the ground, below the water level and/or in close proximity to other constructions. Elements of the support systems may be driven, vibrated, pressed in, drilled or constructed by mixing soil with grout or by jet-grouting. These support systems can be installed temporary (recovered afterwards, partially or as a whole) or permanent (as elements of underground storeys). They are made of steel profiles with wooden props in between (Berliner walls), steel sheet piles (sheet pile walls), reinforced concrete (drilled pile walls) or cement grout. For very deep excavations we use various sorts of supports: ground anchors, anchoring piles/micropiles or struts. When it is necessary, excavation bottom is sealed with the Deep Soil Mixing (DSM) method, jet-grouting method or temporarily/permanently anchored. Foundations of constructions directly adjacent to deep excavations are protected by active use of tensioned anchors or supported with micropiles or columns formed in the ground with the jet-grouting method.
Tests and measurements. Within the performed geotechnical works we also offer all kinds of test and measurements, including:
• soil investigation;
• static and/or dynamic load tests;
• assessment of pile capacities based on sets and dynamic formulas;
• preliminary, utility and acceptance tests of ground anchors;
• monitoring of forces in ground anchors;
• distribution of forces in piles;
• soil pressure measurements;
• pile integrity/quality tests;
• monitoring impact of piling on the environment (vibrations, noise, soil dislocations);
• inclinometer measurements.
Design Office. We also offer design support of experienced designers from our Design Office, who provide professionally prepared calculations as well as detailed, technical and as-build design documentations. The scope of our services is always customized to the real needs of our Client.
We invite you for cooperation.